This summarizes a selection from 215 applications for the Experimental Radio Service received by the FCC during October, November, and December 2011. These are related to AM broadcasting, FM broadcasting, spread spectrum on HF and VHF, unmanned aerial vehicle control, electronic warfare support, small satellites, white space technology, video production, cellphones in prisons, TV interference, RFID, and radar.  The descriptions are listed in order of the lowest frequency found in the application.

• Amateur Radio operator Brian Justin filed an application with exhibit (shown below) for special temporary authority to “be able to operate antique Heising modulation on 470.0 kHz on or about x-mas evening and several other days” to commemorate Reginald Fessenden’s ‘original claimed voice transmissions over 100 yrs ago.” The transmissions were to take place on 470-475 kHz from Forest, Virginia.
• Chesapeake Operating, Inc. filed an application with exhibit for special temporary authority to “provide music and announcements throughout Chesapeake’s corporate campus” and “determining propagation and coverage while simultaneously considering a waiver to operate permanently under 15.221(b)” of the FCC’s Rules. Operation is to be on 1300 kHz and 1610 kHz in Oklahoma City, Oklahoma. The applicant says it’s parent company, Chesapeake Energy, “is the Nation’s second-largest producer of natural gas, a top 15 producer of oil and natural gas liquids and the most active driller of new wells in the U.S.” “Chesapeake is considering the use of low power AM broadcasts at its corporate campus that could be used for a variety of purposes. For example, the system could be used for disseminating severe weather information (e.g., tornado watches, tornado warnings, ice storms, etc.,) street closings, traffic re-routes due to construction, as well as during outdoor events such as the farmers market that Chesapeake sponsors during the summer months and outdoor activities associated with United Way campaigns, concerts, and family events.”
• Phillip J. Williams filed an application with exhibits for special temporary authority to operate using spread spectrum on HF and VHF frequencies in the Amateur Radio Service. Current rules don’t permit spread spectrum operation below 220 MHz. In the tests, comparisons will be made with other digital modes such as JT65A, Olivia, MT63 and PSK31, including with regard to weak signal capabilities. Experiments will focus on minimum required transmitter power and developing operating procedures for the Amateur Radio community. Operation will take place in Euless, Texas in various Amateur bands between 1.8 and 148 MHz.
• The Center for Remote Sensing of Ice Sheets at the University of Kansas filed an application with exhibits for experimental license to conduct testing of a 72 MHz link used to control the “Meridian Uninhabited Aircraft System,” an aircraft that carries a variety of scientific payloads, including ice-penetrating radar, for research on the flow ice sheets in Greenland and Antarctica. Operation will be at several locations in Kansas and Utah on 72.01-72.99 MHz.
• National Public Radio filed an application with exhibits for experimental license to evaluate the feasibility of using a Cognitive Modulator. This is envisioned as an alternative to consumer FM modulators long used to allow audio from a personal electronic device to be played through a vehicle’s FM radio. These modulators have their drawbacks: they can cause interference to other FM listeners, FCC rules limit their power such that it can be difficult for them to overcome interference, and they may need to be retuned as the vehicle travels into range of new, interfering FM stations. Preliminary testing led by NPR suggests a Cognitive Modulator operating at 87.7 MHz may present a solution to the above service problems. Such a device would sense the amount of interference and noise (I+N) at or around 87.7 MHz and adjust its transmitter carrier power to provide a desired C/(I+N) in a vehicle’s FM radio. Experimental operation will be in New Haven, Connecticut on 87.7 MHz
• Lockheed Martin filed an application with exhibits for experimental license to operate at Syracuse, New York on various frequencies in the bands 109.375-137.000, and 960-1400 MHz. This is to test electronic-support-measures receiver systems for the US Navy on vessels being deployed overseas.
• Cosmogia Inc. filed an application with exhibits for special temporary authority to operate communications inks in support of the Dove 1 satellite mission. This is a “technology demonstration to: a) test the basic capabilities of the low-cost bus built from non-space, Commercial Off-the-Shelf (COTS) components; b) show that a bus constrained to the 3U cubesat form factor can host a small payload; and c) demonstrate the ability to design, produce and operate satellites on short schedules and low cost. Dove 1 will do this by transmitting health and payload data to the ground.” The satellite is due to be launched as a secondary payload on the maiden flight of the Taurus II from NASA’s Wallops Flight Facility. It will be placed in a nearly circular orbit of 280 km, which will decay with the satellite burning up in the Earth’s atmosphere approximately 2 weeks after launch. Amateur beacon transmissions on 145.825 MHz will commence upon deployment of the satellite and a half-duplex, spread spectrum radio on 2.4016-2.4776 GHz will be used for main payload downlink and telecommand uplink. The satellite has dimensions of 10 cm x 10 cm x 30 cm. Its mass is about 5 kg.
• The Wisconsin Wireless and NetworkinG Systems (WiNGS) Laboratory at the University of Wisconsin, Madison, filed an application with exhibit for experimental license to test fixed point-to-point backhaul and vehicular networking on TV white spaces. Operation will be in the vicinity of Madison, Wisconsin on 174-216, 470-608, and 614-698 MHz. The platform to be used is called Wide Band Digital Radio. Its major function is to perform frequency translation from Wi-Fi frequencies in the 2.4 GHz range to UHF-TV frequencies.
• Lockheed Martin filed an application with exhibits for experimental license to conduct radiosonde factory acceptance testing as part of a government contract. During testing, the radiosondes are attached to a weather balloon and deployed from a Lockheed Martin facility in Marion, Massachusetts. The weather balloon can travel a ground distance of 250 km and reach a height of 30 km. The average duration of the deployment is 135 minutes. The expected number of deployments is about five per month. The radiosonde transmitter uses a monopole antenna that directs transmitted power towards the ground. Testing will take place on various frequencies between 400.25 and 405.5 MHz.
• Carlson Wireless filed an application with exhibit for special temporary authority to test white space radio technology in rural locations of Hawaii prior to database and device certification. This is to compare performance of white space radio propagation to that of WiMAX and 900 MHz radios in very dense tropical cover and in heavy rain conditions. Operation will be in Pahoa, Hawaii and in Keaau, Hawaii on 470-608 and 614-698 MHz.
• America’s Cup Event Authority, LLC filed an application with exhibit for special temporary authority to permit video production, and to coordinate operations and security for the Americas Cup World Series Sailboat Race in the vicinity of San Diego. Several frequency bands are requested including 470-476, 476-482, 482-488, and 506-512 MHz (i.e., television broadcast channels 14, 15, 16 and 20), television broadcast auxiliary frequencies for video production at 2025-2110 MHz, and amateur allocations at 2390-2400 MHz and 3300-3500 MHz.
• Robert Miller Consulting filed an application with exhibits for special temporary authority to operate on TV channel 44, 650-656 MHz, near Green Bay, Wisconsin to conduct research on the effects of wind turbines on over-the-air TV reception. In the view of the applicant, the “proliferation of wind turbine deployment and the associated history of television interference problems have prompted an urgent need for development of tools to assist in the placement of the turbines so as to minimize interference.” This exercise is funded by the U.S. Department of Agriculture, and there is the prospect of more funding for more exhaustive tests depending on initial test results.
• ShawnTech Communications filed an application with exhibits for special temporary authority to operate in Ridgeville, South Carolina on 851-869, 869.2-893.8, 869.70-893.31, 1930.2-1989.8, and 1931.25-1988.75 MHz. Details are not available due to a request for confidentiality. This appears to be a test of a managed-access cellular system for intercepting unauthorized phone calls from a prison. It further appears that a cellular operator gave its consent for the test.
• Boeing filed an application with exhibits for special temporary authority to test RFID tags that Boeing and commercial airlines use on various items aboard commercial aircraft. The device being used is certified for unlicensed use in Europe but not in the US. Goodyear, Arizona on 865-867 MHz.
• The South Coast Air Quality Management District filed an application with exhibits for experimental license to operate a wind-profiling radar, which depends on the scattering of transmitted signals by irregularities in the index of refraction of the atmosphere. The irregularities are caused by turbulence in the wind. By determining the Doppler frequency shift, the speed of the wind can be determined. Temperature data can be obtained by measuring the propagation velocity of an acoustic signal. The hardware involved will be a receiver/modulator, a final amplifier/preamplifier, a digital control and data processor, and an antenna system. These items were developed by NOAA and are fabricated by Vaisala, and will be owned and operated by the applicant, a government agency that manages air pollution control in the southern California counties of Los Angeles, Orange, Riverside and San Bernardino. The data collected will include hourly profiles of low-level winds between 100 and 5000 meters above ground level (m AGL) and “virtual temperatures” between 100 and 2500 m AGL. This data will be collected to improve meteorological analyses, as well as air quality forecasting and modeling in the South Coast Air Basin. Operation will be on 915 MHz at Irvine, California.
• Harris filed an application with exhibits for experimental license to test transmission and reception of voice and data from 1.35 GHz to 1.39 GHz at various distances and locations at its facility in Rochester, New York. Stationary and mobile tests will be performed to transmit voice and data in both urban and rural settings. Tests will replicate in-theater tactical communications. This testing is partly in support of U.S. government contracts. The tests will use the Harris AN/PRC 117G wideband tactical radio.
• BAE Systems filed an application with exhibit for special temporary authority to test next-generation “communication intelligence” for unmanned aerial vehicles (UAVs). Operation will be in Hudson, New Hampshire on 1626-1660 MHz.
• Orbital Sciences filed an application with exhibits for experimental license to operate from Persimmon Point, Virginia on 2222-2228, 2239-2243, 2258-2260, 2267-2271, 2286-2290, and 5764-5772 MHz. Orbital is under contract to NASA/Johnson Space Center to develop a commercial cargo transportation system for delivery of cargo to the International Space Station. The contract includes two demonstration flights of this system, and eight operational flights to the Station. The experimental operation is in support of various communications needs for these flights from NASA’s Wallop’s Flight Facility, including flight termination system uplink, multiple S-band telemetry data downlinks, a C-band radar system with transmit and receive, and a GPS uplink. 
• RF Film, Inc. filed an application for special temporary authority to provide wireless video transmission from film cameras during the production of “Spiderman 4” in Los Angeles. Operation will be on 2363-2371 and 2380-2388 MHz. Those frequencies are in a band normally used for aeronautical telemetry, but the applicant has consulted with the frequency coordinator for that band (AFTRCC), which approved their use on a non-interfering and temporary basis.
• Google filed an application for special temporary authority to test a next-generation personal communications device it’s developing. It will test the functionality of “of all subsystems, including WiFi and Bluetooth radio. Users will connect their device to home WiFi networks. This line of testing will reveal real world engineering issues and reliability of networks. The device utilizes a standard WiFi module, and the planned testing is not directed at evaluating the radio frequency characteristics of the module (which are known), but rather at the throughput and stability of the home WiFi networks that will support the device, as well as the basic functionality of the device. From this testing we hope to modify the design in order to maximize product robustness and user experience. Utilizing the requested number of units will allow testing of real world network performance and its impact on applications running on the device, so that any problems can be discovered and addressed promptly. All devices will be used by and registered to specific individuals (all Google employees), and Google will maintain a record of each device, so that they can be easily recalled at any time during testing and when testing is complete. The devices will be tested at Google facilities and in and around the employees residences.” There will be 252 devices in the test, which will take place in Mountain View and Los Angeles, California; Cambridge, Massachusetts, and New York, New York on 2400-2483 MHz.
• AirScan filed an application with exhibits for experimental license to test “state‐of‐the‐art airborne surveillance and security operations for government and private service customers.” Transmissions will be from aircraft in the Titusville, Florida area on 2475.5 and 2458.5 MHz.
• Panoscan filed an application with exhibits for experimental license to test video transmission from a robot it’s developing for law enforcement inspection purposes. Operation is to be in Sylmar, California on 5725-5858 MHz. The transmitter is an Iftron Mondo Stinger 5.8 video transmitter. Apparently, prior work in development of the radio portion of the robot fell under Part 15 of the FCC’s Rules, and now it does not, necessitating the experimental license. Panoscan says it has a request pending before the Commission for waiver of Section 15.247 of its Rules to allow the use of digital modulation.
• GE Aviation filed an application and exhibits for special temporary authority to conduct outdoor testing of its HEET radar system, a “proprietary three-dimensional radar scanner for radar cross section measurements. This one of a kind scanner is currently in checkout phase. Eventually the system will be used on military bases.” Operation will be in Evendale, Ohio and in Peebles, Ohio on 6.5-18 GHz.
• Telephonics Corporation filed an application with exhibits for experimental license to operate in Huntington, New York on 8850 MHz. This to support testing of the ARSS-1 portable radar system. The radar operates on a single channel at a pulse repetition frequency of 5 kpps. The pulse width is 17.0 μS and the receive interval is 183 μS for a total repetition interval of 200 μS.
• Telephonics Corporation filed an application with exhibit for experimental license to conduct tests of its model RDR-1700B maritime surveillance and imaging radar, which the company describes as a multimode airborne search radar that uses pulse compression techniques to provide various search and imaging capabilities, using a programmable waveform generator that can generate different pulse widths, pulse repetitions, and modulation. The radar operates over the frequency band of 9.2 to 9.5 GHz. Using frequency agility the radar is continuously changing frequency thereby minimizing the number of undesired pulses being received by fixed-frequency marine and aviation weather radars. This testing is to improve the radar’s signal processing techniques for the purposes of improving the radars ability to search, detect and track multiple targets during over water surveillance as well as search and rescue and weather detection/avoidance capabilities. In addition, development of imaging techniques that provide the ability to identify the size and shape details of objects detected beyond visual ranges or bad weather conditions will also be part of the testing. Operation will be in the vicinity of Farmingdale, New York.
• The University of Nebraska – Omaha, filed an application and exhibits for special temporary authority to test repurposing of Furuno marine radar to count aircraft at a non-controlled airport. Operation will be at the Council Bluffs, Iowa airport on 9410 MHz. The applicant says it wants to investigate marine radar in this application as a step toward creating a system to prevent aircraft collisions. The radar system in this experiment will include a stationary radar antenna linked to a 10 inch radar display that will transmit data to a computer, which will be programmed to count aircraft. The data being transmitted includes, among other things, the distance from the radar, the heading from the radar, and the heading of the aircraft.
• Tachyon Networks filed an application with exhibits for special temporary authority to test an 18” terminal mounted to a C-12 military aircraft. Communications will be with one of three Intelsat-owned, U.S. licensed satellite hubs. This is in support of a U.S. Army contract for communications in Afghanistan related to airborne intelligence, surveillance and reconnaissance. Operation will be centered on Middletown, Delaware on 14.0-14.5 GHz.
• Mokulele Research Corp. filed an application with exhibits for special temporary authority to test airborne mechanical tracking antenna performance. Mokulele will use millimeter-wave spectrum from a directional antenna on the ground pointed straight up. The airborne receiver antenna, installed inside the cabin of a small aircraft, will intercept the narrow beam, and immediately activate its reflector to the optimum angle in order to sustain strongest signal level, while the aircraft’s pitch and bank angles change. The aircraft will fly over the ground station between 8,000 and 18,000 feet AGL in tight circles of approximately 0.5 nautical mile diameter. The signal strength, optimized by the tracking antenna, will be recorded for later analysis. An airborne-antenna signal re-acquisition algorithm will also be evaluated. Operation will be on 46.75-46.95 GHz at Haleiwa, Hawaii.
• Honeywell filed an application with exhibits for special temporary authority to conduct flight testing using a developmental sensor to collect data on potential helicopter obstacles such as power lines and towers. The data collected will be used to learn about the detection criteria of such targets. Operation will be in Torrance, California; Phoenix, Arizona; and Everett, Washington on 92-94 GHz. The sensor antenna connects to a PC‐based data processing system used to operate the antenna, display, and capture results. The antenna radiates a 0.7 degree horizontal by 4.0 degree vertical beam. The modulation is a linear frequency modulation that utilizes up to a total of 1.0 GHz about a center frequency of 93.0 GHz (i.e., 92.5 GHz – 93.5 GHz). The bandwidth is swept repeatedly at a rate of 500 us per sweep.
• Raytheon Missile Systems filed an application with exhibit for special temporary authority to conduct tests on 94-96 GHz at Tucson, Arizona. “The current system under development is a directed energy device that uses directed radio signals. This application is being filed for the experimental development of a directed energy device to be exported that will use radio waves to achieve the mission.” (“Directed energy device” appears to be a euphemism for directed energy weapon.) “Because this technology is very new, there is a great deal to be learned still about how to effectively direct the radio energy while ensuring that there is no lasting harm.” Furthermore, “any personnel present will have volunteered to work on this technology.” The device to be tested will have an input power of 800 watts and an effective radiated power of 50 megawatts.

Gerald Whitney filed an application with exhibits for experimental license to test a prototype AM broadcast transmitter system covering 2-16 MHz at a carrier power of 1 kW. The system, part of a U.S. Department of Defense project, includes a frequency-agile transmitter, antenna tuning unit, and antenna. Testing will be done in Victor, New York.

Curtis-Wright Controls filed an application with exhibit for special temporary authority to demonstrate its 3d-Radar brand of ultra-wideband ground penetrating radar (GPR) for prospective non-federal customers as it awaits expected FCC grant of its Part 15 waiver request for the device. Operation will take place at various locations in the U.S. on 140-3000 MHz, with frequency notching to preclude transmissions in the bands 608-614 MHz, 1400-1427 MHz, 1660.5-1668.4 MHz, and 2690-2700 MHz, in accordance with an NTIA authorization. The company filed its Part 15 waiver request with the FCC in June 2010 seeking authorization to operate the device for non-federal use (ET Doc. No. 10-167). The company understands the FCC’s Office of Engineering and Technology is working on an order that would permit non-federal use of the device. The company notes that NTIA, with FCC coordination, has already approved the use of the device for federal use on a nationwide basis.

Carlson Wireless Technologies filed an application with exhibit for special temporary authority to test voice and data connections among multiple Chevron Oil oil-field facilities using TV white space frequencies. Test results will be compared to the performance of a current 900 MHz system. Operation will be at several California locations in the 174-216 MHz and 470-698 MHz bands.

Southern Methodist University filed an application with exhibits for experimental license to operate a cognitive radio testbed. The testbed is backed by a National Science Foundation grant.  Operation will be on several frequency bands between 400 MHz and 6100 MHz in the Dallas area. The testbed will be used to study wireless performance in mobile and stationary environments. Featured in the testbed is real-time multi-band operation, which can be used to aid design of context-aware and cognitive algorithms that use multiple frequency bands to adapt to dynamic environmental conditions. One goal of the research is to develop an open-access database of wireless performance in multiple scenarios.

L3 Nova Engineering filed an application with exhibits for experimental license to demonstrate a seismic activity sensor network. Testing will take place in Great Falls, Virginia on 420-440 MHz.

Sierra Nevada Corp. filed an application for special temporary authority to test equipment that will facilitate formation flight between two aircraft. This supports DARPA’s Global Hawk autonomous aerial refueling demonstration program that is intended to accomplish the first-ever fully autonomous rendezvous, refueling, and formation flying of two unmanned aircraft. Each node of the system consists of a GPS receiver, processor, and other equipment including the UHF data link that is the subject of this application; one node would transmit data to the other such that the receiving node would be able to calculate its position and orientation relative to the transmitting node. The testing will take place in Salt Lake City, Utah on 420.25-426.60 MHz.

Raytheon BBN Technologies filed an application for special temporary authority test distributed-transmit beamforming using RF modules developed under DARPA’s Precision Electronic Warfare (PREW) program. “Specifically, BBN Technologies seeks to demonstrate the capability to synchronize clocks from up to 10 RF modules remotely using UHF band frequencies, and project RF energy at specified frequencies that results in the coherent combining of focused power within a small geographic area of interest using the these radios to enable high data rate transmissions and longer ranges.” According to DARPA, “the goal of the Precision Electronic Warfare (PREW) program is to demonstrate technologies and a prototype system that will enable the fielding of an ad hoc sparse array consisting of multiple airborne and/or ground nodes that can perform surgical jamming. The PREW system should be able to project RF energy that results in the coherent combining of focused power within a small geographic area of interest (AOI). When operating outside the AOI, the system must minimize the coherency of the RF energy to limit the impact to collateral systems.” Testing will occur at Sky Meadow State Park, Delaplane, Virginia on 437-493 MHz, 877-953 MHz, and 2400-2480 MHz.

Airvana filed an application with exhibit for experimental license to develop and test prototype LTE infrastructure equipment on 698-716 MHz, 728-757 MHz, 776-787 MHz, 806-824, MHz, 851-869 MHz, 1910-1915 MHz, and 1990-1995 MHz. Airvana says it will evaluate handoff performance among sectors, network capacity, quality of service, multi-path performance, average data rates, and interference performance. The testing is to take place nationwide.

Lockheed Martin filed an application with exhibits for experimental license to conduct testing in support of the Extended Area Protection System (EAPS) missile test program under sponsorship of the U.S. Army. The EAPS interceptor is a small ground-launched missile system under development as a performance demonstration program of hit-to-kill technology. The hardware requiring licensing consists of two systems. The first is the telemetry system providing downlink of flight telemetry data from the interceptor to a launch control trailer. The second is the unmanned ground system that provides uplink of flight control data from the launcher control trailer to the interceptor. Testing will take place in Texas on 2270.5, 2280.5, 2281.5, 4401.5, 4410.5, and 4411.5 MHz.

Bell Helicopter Textron filed an application with exhibits for experimental license to conduct testing and development in support of eventual unmanned helicopter flights. Testing will take place in the vicinity of Arlington, Texas on 2282.50 MHz.

Teletronics Technology Corp. filed an application with exhibits for special temporary authority to test a new transceiver with both OFDM and burst-mode shaped-offset QPSK (SOQPSK). The transceivers are said to provide “maximum transmission and reception distance under harsh environmental conditions.” Operation will be in the vicinity of Newtown, Pennsylvania on 2360-2390 MHz.

North American Eagle, a project testing the capability of a land-based vehicle to safely transition through supersonic speed, filed an application and exhibits for experimental license to operate a Wi-Fi network consisting of five Tropos model 7320 mesh routers mounted on eight-meter towers and one Tropos model 4310 mobile-mesh router mounted in the vehicle’s nose cone. Video and vehicle operational data will be sent to the base stations. Operation is to take place on dry lake beds near Black Rock, Nevada and Diamond Valley, Nevada on 2400-2483MHz (for data) and 5725-5850 MHz (for video). Transmitter output power will be 30 watts. (Wi-Fi at 800 MPH will be a challenge.)

Raytheon filed an application with exhibit for special temporary authority to test a critical-infrastructure-protection radars system. The system uses a p0-degree-quadrant staring radar with moving target indication designed for perimeter intrusion detection applications around secure facilities such as airports, seaports, utilities and other critical infrastructure. The system is based on Raytheon’s SR1500 Short-Range radar, which is under development. The plan is to deploy a network of low-power, short range (1.5 km) radars at fixed locations around critical infrastructure sites of the Port Authority for New York and New Jersey to provide perimeter security. An Ethernet-based network provides communication between multiple radar and electro-optic sensors. Testing will take place at various locations around New York City on 3100-3500 MHz.

L3 Communications filed an application and exhibits for special temporary authority to test a SONAR telemetry transmission system for military use. The system would send SONAR data from a small boat at a rate of 10 Mbps. The link will also carry video from cameras on the boat to allow operators to confirm normal operation of the hardware. The SONAR data and video will be transmitted to a larger manned ship at a range of a few miles. Testing will take place on the Pacific Ocean, between San Pedro and Catalina Island, in the bands 5200-5679 MHz and 5689-5800 MHz.

Laufer Wind Group filed an application with exhibits for experimental license to conduct tests in connection with the development of a radar-activated FAA obstruction lighting system for wind farms. Testing will take place in New York and New Hampshire on 9380-9440 MHz.

Lockheed Martin filed an application with exhibits for special temporary authority to evaluate Ku-band satellite technology for high-data-rate communication to helicopters. It intends to test ViaSat’s proprietary technology said to maintain the flow of data transmission in the presence of momentary path blockage from rotor blades. Test antennas will be mounted on stands underneath the rotor blades. Testing will be in Owego, New York on 14.0-14.5 GHz.

Raytheon filed an application with exhibit for special temporary authority to test a radar system for mobile surveillance system based on the DRS MSTAR commercial-off-the-shelf radar. The radar, in conjunction with electro-optical/infrared cameras, is intended for use in monitoring international borders. Testing will take place near McKinney, Texas on 16.75-17.25 GHz.

General Dynamics filed an application with exhibit for experimental license to operate an airborne radar system in support of ground imaging research using synthetic aperture radar techniques. Separate transmit and receive antennas would be mounted to a rotational pedestal on the underside of an aircraft. The gain of the antennas is 40 dB at 94 GHz, and they have a 1.5 degree half-power beamwidth in both the azimuth and elevation planes. The radar will use a pulsed linear-FM chirp waveform, centered at 94 GHz with a bandwidth of 600 MHz. The width of the waveform pulse will be approximately 20 microseconds and operate at a pulse repetition frequency of approximately 10 kHz. Peak ERP will be 5,000 Watts. Operation will be in the vicinity of Ypsilanti, Michigan.

Ducommun LaBarge Technologies filed an application with exhibits for experimental license to test its model SG-DDR50 security system, a directed-energy weapon that uses millimeter-wavelength energy to “stop, deter, turn back, and otherwise discourage a trespasser, thief, or belligerent and threatening person at relatively long distances.” “The system consists of an electrical power source, a device producing millimeter wavelength electromagnetic energy, an energy director projecting a narrow energy beam towards a target, and mounting and connecting equipment.” “The SG-DDR50 uses the susceptibility of skin nerve endings to millimeter-wavelength electromagnetic energy to report a sensation of intense undesirable heat on the skin of the person in the energy beam, all while doing no harm.” “The purpose of the experimental license is to align the system to operational specifications using infrared imaging of patterns on a sensitive carbon impregnated teflon [sic] target . . ..” Testing will occur in Huntsville, Arkansas on 94.5-95.0 GHz. Transmitter power and ERP are both specified as 800 Watts on the FCC application form. According to the applicant, “[t]he nature of this test configuration does not lend itself to be characterized by traditional measures, such as ERP, ERIP, Peak Power, and the like.”

NAB – Shortages of Capacity, Not Spectrum

The NAB report is prepared by Uzoma Onyeije, a consultant who was once Broadband Legal Advisor to the Chief of the FCC’s Wireless Telecommunications Bureau. The main claims are that there is no need for an urgent and massive reallocation of spectrum, that there are numerous alternatives to spectrum that can boost network capacity, and that sources of spectrum other than TV are more readily available.

It starts by noting there wasn’t a “spectrum crisis” until the American Recovery and Reinvestment Act of 2009, which required the FCC to promote broadband access. The National Broadband Plan followed calling for 500 MHz of spectrum to be made available for broadband within 10 years, with 300 MHz of that for mobile within five years, and 120 MHz of that to come from television broadcasting. Seven months after concluding that 300 MHz was needed in the short term, the FCC released a Technical Paper intended to support the 300 MHz figure. In November I wrote on that Paper, pointing out several factors not considered that, had they been, would have acted to reduce the estimate of short-term spectrum requirements. Later, I questioned the appropriateness of the FCC relying on a forecast prepared by the marketing department of an equipment vendor, without critically and openly examining the assumptions that went into the forecast. Onyeije shares some of the concerns I had, and still do, with that Paper.

I expect the American Recovery and Reinvestment Act turned some spectrum wants into needs, but by all accounts mobile network data volumes are increasing significantly, fed by a volatile mixture of old flat-rate plans and new bandwidth-hungry devices, though the growth rate of those data volumes is decreasing. Getting additional spectrum is a natural option to consider for more capacity. Onyeije provides a list of non-spectrum options. Some have been mentioned here before – offloading to Wi-Fi and other technologies, adjusting rate plans so largest data users pay more, tighter software coding of applications and operating systems. I don’t think I’ve discussed channel bonding, which is a technique that uses non-contiguous spectrum – combining a sliver here and a sliver there. Support for this will be appearing in LTE-Advanced, going on the air in a few years. Backhaul is also something I haven’t focused on; how much of the current spectrum crunch is really due to backhaul bottlenecks?

Another capacity-increasing technique mentioned is sectorization – changing a non-directional transmission system to a directional one using two or more sectors at the same cell site. In the most congested urban areas in the US, antenna systems are generally configured with three sectors, with each sector 120 degrees wide. You don’t see many six-sector configurations, in which each sector is 60 degrees wide. Theoretically, that doubles capacity from the same tower. A long time ago there was more activity in six-sector antenna systems, but the sense then was it wasn’t too practical; you might end up with just a 70% capacity increase because of real-world issues such as imperfect antenna patterns. It was hard to justify the expense. These days, however, with better transmission technology, it should be looked at again. I note SK Telecom in Korea is deploying 500 six-sector sites, after good results with 20 test sites.

Onyeije looks at the spectrum warehousing issue. If an operator has spectrum that isn’t being used, but is on track to build it out, I’m fine if it is fallow for a year or so. Maybe longer if the delay is to wait for much more efficient transmission technology that is on track in the standards process. If it is just sitting there with no build-out requirement and no prospect for utilization, I’d think the operator’s investors would create pressure to sell it. If a spectrum holder has “no plans to sell, lease or use” its spectrum, to quote one in Onyeije’s report, I’m more concerned.

Aside from the warehousing issue, Onyeije identifies a few bands that have been languishing at the FCC for years and makes the point that, since they have been idle for so long, the spectrum crisis must not be so great. These are the AWS-3 spectrum at 2155-2175 MHz, H block spectrum at 1915-1920 MHz and 1995-2000 MHz and J block spectrum at 2020-2025 MHz and 2175-2180 MHz, 700 MHz D block at 758-763 MHz and 788-793 MHz. What’s the story there?

Onyeije suggests mandatory receiver standards. Receivers are already very good in mobile broadband because of vendor competition and the need to operate in a congested environment. Receiver design is proprietary and an important source of differentiation among vendors. I’d think continued improvement of receiver performance in the marketplace, in the long run, would achieve greater capacity benefit than imposed government standards.

The report calls on the FCC to complete and publicly release a comprehensive spectrum inventory, along the lines of the Snowe-Kerry RADIOS Act, which includes measurements. The FCC has made available several spectrum tools online, including LicenseView and the Spectrum Dashboard, which it says is its inventory. According to their disclaimers however, LicenseView “is not intended for analysis of spectrum utilization or spectrum holdings of licensees” and “the FCC makes no representations regarding the accuracy or completeness of the information maintained in the Spectrum Dashboard.” Regarding federal spectrum, I’d add that an inventory becomes more important in light of GAO’s report on NTIA processes that said “NTIA cannot ensure that spectrum is being used efficiently by federal agencies” in part because “NTIA’s data collection processes lack accuracy controls and do not provide assurance that data are being accurately reported by agencies.” Thus, “it is unclear whether important decisions regarding current and future spectrum needs are based on reliable data.”

CTIA , CEA, and WCAI dismiss the NAB report, saying it’s a stalling tactic and they know these things already. One of Onyeije’s points, however, is that it’s the Commission that needs to know these things, and fully investigate and quantify the impact of all capacity-generating alternatives. It has not. It tried with the Technical Report, but inadequately.

CTIA Establishes the Efficient Properties of Cellularization

The CTIA report is intended to demonstrate that US mobile wireless providers are “extremely efficient” in their use of spectrum. The report was prepared by Peter Rysavy, a consultant known in wireless circles for his series of technical reports, with many pertaining to spectrum, air-interface, and mobile device issues.

This report seems to be a response to an NAB claim, some time back, that broadcasting is a more efficient user of spectrum than wireless. I presume NAB’s claim is based on broadcasters’ DTV system transmitting about 19 Mbps in a 6 MHz bandwidth, while the wireless operators are sending about 10 Mbps in 10 MHz bandwidth. (So, TV has more bits per Hertz.) This is kind of an apples and oranges comparison, but the comparison has been made and we have this report in response. Having spent a lot of time in 3G and 4G standards battles, I have no doubt that those participating are trying wring out all the efficiency that is both possible and practical. Wireless standards groups sweat to get another tenth of a dB improvement. Of course, part of efficiency is an implementation issue and not covered by standards. I agree cellular services are more efficient at delivering unicast traffic. Broadcasters, however, can be more efficient in another way. The efficiency debate occurs in part because we have not agreed on a definition of efficiency. More on this below.

The CTIA paper starts with a section on spectral efficiency. It discusses its fundamental measures and technologies that have been used to continually improve it, including adaptive modulation and coding. (Rysavy says his list of technologies is not exhaustive, but to his list I’d add Hybrid Automatic Repeat Request as a key enabler.)

Rysavy observes that the industry’s technologies are operating close to the Shannon Bound, the theoretical limit on the spectrum efficiency that can be had for a given signal-to-noise ratio. Capacity improvements thus must come from advanced antenna techniques (such as MIMO) and topology evolution (e.g., adding picocells to a macrocell).

The report is hopeful on the prospects for Wi-Fi and femtocells to relieve traffic on the macro-cellular network. I’m somewhat more cautious on the potential of femtocells to relieve the capacity crunch.  For various reasons, including interference management, what I think may happen with femtocells is that they get pulled out of the home and put up in neighborhoods using existing structures for support. (The more-favorable pole-attachment rules recently adopted by the FCC are timely.) There are many small-cell trials underway but I haven’t seen much in the way of results.

Network evolution is discussed in a larger sense, focusing on developments in heterogeneous networks, but Rysavy says that’s not enough and that more spectrum is needed, too.

Back to the efficiency issue, the efficiency of cellular systems is compared to that of broadcast television. The point made is that if you take many small cells and place them within a larger area  covered by one transmitter (e.g., one for TV), the cellular system can deliver many times the unique bits in that area. This is true, if that is the definition of efficiency. Let’s look at it another way and compare the maximum number of users served by each scheme. As a best-case scenario, assume the cellular users are using a low-bit-rate application such as LTE VoIP. In 10 MHz we can support about 400 users. That times 3 sectors is 1,200 users per cell. That times 30 cells (as per the example in the paper) is 36,000 users that can be supported at once. In contrast, a TV  station covering the same area can support an unlimited number of users, albeit one-way, since it isn’t limited by uplink capacity nor MAC addresses. Is it a fair comparison? No. One is broadcasting and the other is cellular. Can’t cellular broadcast also? Yes, but to the extent it does the unique-bits argument becomes weaker. We can go around and around. The television example is used, along with other analysis in that section, in an attempt to persuade the reader that “cellular architectures represent a configuration that is capable of providing tremendous service capacity to its users.” I’m convinced, but I was before reading the report.

Rysavy depicts how voice minutes, message volume, and data volume have increased on cellular networks over the years. Yesm growth has been dramatic, but the growth rate is slowing.

Epilogue

Concurrent with this debate, ATSC is in the early stages of planning and developing the second DTV standard to replace the current one that’s been around for about 15 years. LTE specifications support broadcasting, which can be done in a cellular manner on the same frequency. Transmissions are synchronized so the terminal can combine energy from multiple sites. The broadcasters looked at cellularization a year ago assuming use of the current ATSC DTV standard, and rightly found it was not practical. It just wasn’t designed for that purpose. With the new LTE standards, it’s time to look at TV cellularization again but with LTE as a core technology. There could be a return path, inexpensive chips for receivers, and it might  be able to be done in less than 100 MHz, making over 200 MHz available for auction. With DTV, the broadcasters found significant deployment and operating costs with cellularization, but with LTE infrastructure would be shared; it remains to be determined if it’s a business. The technology is there; it just has to be architected by broadcasters and infrastructure vendors into suitable form.

UPDATE 5/20/2011

The FCC issued a Public Notice today seeking comment on using the 2 GHz bands identified as “languishing” by NAB. Some are listed above. 75 MHz total.

• Virginia Tech filed an application with exhibits for experimental license to operate on several frequency bands: roughly, in the 160, 220, 410, 470, 800, 900, 1850, 1950, and 3500 MHz range. This is for its CORNET cognitive radio network test bed, which is for the use of researchers evaluating cognitive radio engines, sensing techniques, applications, protocols, performance metrics, and algorithms in a real-world environment. The test bed has 48 nodes distributed on four floors of a campus building. Nodes consist of an Ettus Research USRP2 software-defined radio (SDR), or similar, each with a wideband antenna.  Frequency, operating mode, and protocols are controlled by computer through a wired connection. “Mobile” units are used in the building to evaluate handoff and interference characteristics.

• BAE Systems filed an application with exhibit for special temporary authority to test a new version of the Army’s Ground Mobile Radio. Testing will take place in Wayne, New Jersey on 287 and 425 MHz.

• The University of Wyoming filed an application with exhibits for experimental license to operate radios on 401.65 MHz in support of sage-grouse research in the Bighorn Basin of Wyoming. The study will monitor the effects of bentonite clay mining on sage-grouse by comparing hen survival, nest survival, and brood survival in an area actively mined to a reference area where mining is not taking place. The study will monitor the movement of about 50 birds in each study area. Each sage-grouse will be fitted with a 22-gram solar-powered integrated GPS receiver and UHF transmitter manufactured by Microwave Telemetry. The device records two-dimensional location data and transmits it at intervals.

• L3 Communications filed an application with exhibits on behalf of the National Institute of Justice (NIJ) for special temporary authority to conduct demonstrations of prototype cognitive radio technology developed by university researchers and funded by NIJ. The technology is being developed to improve public safety and law enforcement communications.  Frequency bands around 462, 769, 799, 2412, 4940, and 5150 MHz will be used. The demonstrations include cognitive channel management, radio-channel waveform identification, and reconfigurable OFDM waveforms.

• Raytheon Network Centric Systems filed an application with exhibit for special temporary authority to test a high-speed data-gateway radio system that operates in TV white space. It uses 12 channels, each 1.2 MHz wide. Operation will be in several California cities on 470-698 MHz (TV channels 14-51).

• General Dynamics filed an application with exhibit for experimental license to test digital data links for the use of unmanned aircraft systems (UASs). The new links are designed to allow higher concentrations of unmanned aerial vehicles (UAVs) in the same battle space. Testing will occur in South Carolina and Vermont on 1760-1850 and 2202-2290 MHz.

• TerreStar filed an application with exhibit for special temporary authority to operate a prototype transceiver for automobiles. TerreStar operates a 2 GHz satellite (TerreStar-1). In connection with providing services over the satellite, TerreStar is working with a vendor to develop and bring to market an automotive kit composed of a transceiver and a cradle for TerreStar’s GENUS satellite smartphone (currently marketed as Satellite Augmented Mobility (SAM) by AT&T). The transceiver and cradle will be mounted in an automobile and a roof-mounted antenna added. The transceiver will transmit on 2005-2010 MHz using linear polarization and will receive on 2195-2200 MHz using left-hand circular polarization; these frequency bands have been allocated for use by TerreStar-1 to provide mobile satellite service (MSS). Operation will be at various locations throughout the continental United States.

• ZAI filed an application with exhibit for special temporary authority to test an ultra-wideband (UWB) vehicle-mounted radar system for identifying roadside threats and obstacles. The hardware is manufactured by Time Domain Corporation and operates on 3100-5600 MHz. Testing will be done in Jefferson, Maryland. The device generates a signal that is pulse-position modulated; the position of the modulated pulse varies randomly in time producing an approximate Gaussian noise signal.

• Integral Systems Inc. filed an application with exhibits for experimental license to test a transportable Rapid Attack Identification Detection Reporting System (RAIDRS). RAIDRS consists of a central operating location and a variety of transportable antennas deployed around the world to detect, characterize, geolocate, and report sources of RF interference to U.S. military and commercial satellites. In the test, the RAIDRS will be connected to a transportable satellite terminal and linked to an earth station through an X-band or Ku-band satellite transponder. Link quality will be measured and recorded continuously to isolate any communications link failures. Data rates for the test will be 4352 and 8192 Kbps. Operation will be on 7.9-8.4 and 14.0-14.5 GHz.

• Teledyne Brown Engineering filed an application with exhibits for special temporary authority to experiment with Degraded Visual Environment (DVE) radar, intended to allow helicopter pilots to have a visual representation of the ground when it is obscured. It also serves as an altimeter. Testing will take place on 35.2 GHz at Huntsville, Alabama.

• Google filed an application for special temporary authority to conduct experiments of advanced driver assistance systems it’s developing. Each test vehicle contains several radars, operating in the 76.0-77.0 GHz band, that are used to sense the environment. The vehicles will be driven through a variety of traffic situations, including along freeways, on urban streets, and through complex intersections. Google suggests one test would be for the case when a vehicle is about to make a right turn on to a busy road; a left-sensing radar would inform the vehicle to allow high-speed traffic to pass before proceeding.

The reports seem to have been triggered by a February 14 Stanford News Service release. For those wanting to go beyond the headlines, the researchers have a web site and make available a technical paper that was presented, along with a demonstration, at Mobicom 2010 in September. On its face, this system seems to halve the spectrum needed for a two-way system, but it’s not that simple. Furthermore, for reasons you’ll see below, this doesn’t seem to be a mobile solution. The researchers are coming  from the perspective of improving the performance of WLANs, and the paper is more clear when read from that view. Still, no matter what radio system you work with, full-duplex on the same frequency makes you think. I’ve read the paper and have pulled out what I think are the essential points.

The custom has been to not transmit and receive on the same frequency at the same time because it doesn’t work; the receiver is overwhelmed by interference. Interference cancellation techniques that can help, but not enough. To reduce interference to the point where the receiver can detect the desired signal, we get to the novel aspect of this system. The transceiver uses three antennas, two for transmit and one for receive. Power is split between the two transmit antennas. The transmit antennas are placed such that one is one-half wavelength apart from the other, with respect to the receive antenna. The transmitted signals thus arrive at the receive antenna 180 degrees out of phase and cancel, mostly, in a process the researchers call antenna cancellation. After that, RF and baseband interference cancellation reduces remaining interference to the point where the desired signal can be detected.

If that’s too opaque, think of noise-cancelling headphones.

The system, as implemented, has several practical limitations:

• The two transmit antennas produce a pattern, in the horizontal plane, that varies according to their placement and how they are fed in amplitude and phase. This produces a null (low or no signal) where the receive antenna can be placed, but it also produces undesired nulls where one wants coverage. Adjusting the antennas’ power ratio can fill those nulls to some extent.
• Null position is sensitive to slight differences in transmit antenna power ratios. If the null moves too much, interference returns.
• Null position is sensitive to slight differences in antenna placement. At the frequency used for testing (2.48 GHz), if an antenna moves too much — on the order of 1 millimeter — interference can return.
• The bandwidth is narrow (5 MHz at 2.48 GHz); if the signal is too wide, the outer edges don’t get canceled and there’s interference.
• The requirement that the transmit antennas be at least one-half wavelength apart means that lower frequencies become awkward to work with. At 2.48 GHz, one-half wavelength is 5 inches. At, say, 700 MHz, it’s 17 inches.

On the plus side, the researchers say this system can alleviate several wireless networking bottlenecks, albeit with reworking of WLAN MAC layers to allow full duplex (which they’re working on).

• With no time-division, the hidden node problem is reduced since the access point can respond without delay to the first transmitting node. Other nodes hear that response and delay their transmissions, reducing collisions.
• Full-duplex reduces loss of network throughput cause by congestion and MAC scheduling since congested nodes can send and receive packets at the same time.
• Delay in multihop networks is reduced because a node can start forwarding a packet as it receives it, instead of using typical store-and-forward techniques.

They also point to a potential application in cognitive radio; a secondary user, while transmitting, could monitor for the primary user. In addition, the ability to have a control channel in-band and in real-time raises the prospect of improving the performance of some systems.

The full-duplex prototype, made with off-the-shelf parts and incorporating the IEEE 802.15.4 modulation/demodulation scheme, achieves performance within 8% of an ideal system. Some of this shortfall is caused by granularity of the test setup, such as using attenuators with larger-than-desired steps. The researchers are considering applying the technology to IEEE 802.11 radios; that’s a challenge because both power and bandwidth are larger (more interference to be suppressed).

The system seems to perform best with single propagation paths. In the presence of multipath, I’d expect a reduction in performance due to fading; the researchers report multipath was not a “dominant component” in their tests, which were done indoors with pretty good results. I’d like to see simulated or measured performance under a few different multipath conditions.

We handle multipath on WLANs well today through the use of multiple-input and multiple-output (MIMO) antennas. With sufficient multipath, and a sufficient number of antennas, spectrum capacity can be doubled, or more. But MIMO in the WLAN context doesn’t permit full duplex, and thus doesn’t permit the networking fixes that this system does, and those improvements are expected to be a significant source of gain. Furthermore, MIMO is designed to take advantage of multipath; its gain isn’t that great where multipath is low, such as on some outdoor links.

The tradeoffs of this system when comparing it to others are gains from reduced spectrum requirements, losses from lack of MIMO, and gains from relieving the hidden node problem, reducing network congestion, and reducing end-to-end network delay. The researchers suggest the biggest benefits are to come from reducing network bottlenecks; they downplay physical layer gains.

We’ll follow this. Reading about it reminds me of sitting in a wireless standards meeting in the mid 1990’s and hearing about Turbo Codes, a coding scheme that doubles data rates with no increase in transmitted power, and that is in widespread use today. That concept also came out of the blue. Many were skeptical, but it worked. As with this radio system, Turbo Codes were made from existing elements put together a different way. Sometimes that’s all it takes.

(Disclosure: According to the paper’s acknowledgments, this research is supported in part through a gift from DOCOMO Capital, a subsidiary of NTT DOCOMO, which is a client.)

• Harris filed an application (with supporting exhibits) for experimental license to operate on various frequencies between 3 and 15 MHz to test an experimental high-frequency wideband waveform that is intended to operate at either 12 kHz bandwidth or 24 kHz bandwidth to allow faster data transfer via high-frequency communications.

• Harris also filed an application (with supporting exhibit) for experimental license to operate on 4.94-4.99 GHz in support of development of US Army’s Warfighter Information Network: Tactical (WIN-T) and Future Combat Systems (FCS) programs. Equipment is to consist of the HNRe2 Highband Network Radio, manufactured by Harris. Harris says the HNRe2 is comprised of four elements: 1) the Baseband Processing Unit, 2) the Highband RF Unit (HRFU), 3) an Inertial Navigation Unit (INU), and a GPS device. The HRFU further consists of an upconverter, a High-Powered Amplifier (HPA), a Switched Beam Antenna (SBA), a Low-Noise Amplifier (LNA), and a downconverter). The test network will consist of five fixed nodes and one mobile node. The FCC has asked Harris to justify extended testing in a band that is primarily allocated for non-government public safety use.

• Canon U.S.A. filed an application (with supporting exhibits) for special temporary authority to operate wireless devices in support of a private technology and product exhibition from September 1, 2010 through September 3, 2010 at the Jacob K. Javits Convention Center in New York, NY. Canon is planning to import many wireless devices from Japan to be used with displays during the exhibition. These devices are not FCC compliant and not expected to be FCC compliant until after the exhibition. Frequencies requested include 315.0-315.7 MHz, 2.40-2.50 GHz, 5.18-5.67 GHz, and 61.6-62.5 GHz. This application was granted on August 11.

• The Washington State Department of Ecology filed an application (and supporting exhibits) for experimental license to operate 150 Design Analysis model H-222 GEOS satellite radios to transmit stream flow data. Operation is to be on 401.710-401.998 MHz.

• BAE Systems filed an application (with supporting exhibit) for special temporary authority to operate an antenna test range in Merrimack, New Hampshire in support of the manufacture of military systems. Many frequencies are requested from 1 MHz to 2587 MHz. The application was granted on July 29.

• Broad Comm filed an application for special temporary authority to operate in support of an “emergency project by the Massachusetts Institute of Technology Center for Ocean Engineering (MIT) related to the Gulf of Mexico oil spill. …  Part of the project requires collecting continuous video data from an aircraft that will fly over the Gulf. The video feed needs to be relayed to nearby receiving stations either on land or on vessels near the aircraft. The operation may require the aircraft to fly out over the Gulf to a maximum distance of 300 miles (483 km) from the New Orleans, LA area at altitudes up to 3,000 feet.” The application is inconsistent with regard to the specific frequencies requested. At one point it says three frequencies are being requested: 2,210, 2,220 and 2,230 MHz. At another point it says 2253.3 MHz. The application was granted on August 11.

• Olson Instruments filed an application for special temporary authority to test an IBIS sensor unit during static and dynamic bridge testing. Operation is to be on 17.101-17.299 GHz. This application was granted on August 11.

• Lockheed Martin filed an application (with supporting exhibits) for special temporary authority to operate synthetic aperture radar (SAR) in the portions of the Gulf of Mexico affected by the oil spill. The SAR data collected will be used to classify oil debris in support of FEMA operations. Operation is at 16.9 GHz.

• DRS ICAS filed an application (with supporting exhibits) for special temporary authority to operate in support of the manufacture of military systems. The company has requested confidential treatment of details, but appears to be testing the DRS X46-V SATCOM terminal and 4.8 meter ground station in support of development of X-band mobile satellite communications for Operation Enduring Freedom. Operation is to be on 8326-8332 MHz.

• Reindert A. Smit, apparently an amateur radio operator, filed an application (with supporting exhibits) for special temporary authority to experiment with ROS digital communications modem software, whose purpose is to optimize high-frequency, moon bounce, and meteor-scatter digital communications. Operation is to be on several frequencies between 1.838 MHz and 14.416 MHz. Approval was granted on August 10.

• Northrop Grumman filed an application (with supporting exhibit) for special temporary authority to test a radar system that is to demonstrate the ability to track line-of-sight (LOS) terrain obstructions, target detection, and perimeter intrusion. The radar operates using a slotted waveguide array. Operation is to be on 9380-9440 MHz. This application was granted on July 31.

• Raytheon Missile Systems filed an application (with supporting exhibit) for experimental license to operate in support of development of interference-resistant command and control radio transmissions. Operation is to be on 430-440 MHz and 902-928 MHz.

• Raytheon Network Centric Systems filed an application (with supporting exhibit) to test the Nett-Warrior Communications System. This system will be integrated into other Raytheon systems. Operation is to be on 30.025-74.600 MHz.

• CapRock Government Solutions filed an application (with supporting exhibits) for special temporary authority to test an antenna along with modulation and encryption techniques. Operation is to be on 8280-8300 MHz.

• The Alameda County [California] Sheriff’s Office filed an application (with supporting exhibit) for experimental license to operate on 763-768 MHz and 793-798 MHz to develop and evaluate broadband Long-term Evolution (LTE) equipment.

• Alcatel-Lucent filed an application (with supporting exhibit) for experimental license to test LTE at several cell sites in the Chicago area. The purpose of the testing is to verify LTE performance in a mobile environment and to optimize system settings under various environments. Key performance indicators to be verified include attach success rate, paging success rate, and handover success. Operation is to be on several frequencies between 698 and 793 MHz. This application was approved on August 7.

• The Aerospace Corporation filed an application (with supporting exhibits) for experimental license to test synthetic aperture radar (SAR) on 92.05-99.95 GHz. As the applicant explains, in SAR radars, “the transmitter has a component of motion in a direction perpendicular to the beam, and the reflected signals are formed into an “image” of the scatterers when resolved into groups of scatterers in a two-dimensional map based on time-of-arrival (range coordinate) and Doppler frequency shift (azimuth coordinate).” The applicant notes that, in SAR, weather and vibration can mask man-made effects. Part of the research includes mitigating image degradation due to weather and vibration so man-made effects are more apparent. This application was approved on August 7.

• The Union Pacific Railroad Company filed an application (with supporting exhibits) for experimental license to conduct propagation testing on 220.725-220.750 MHz. The applicant explains that “the US rail industry is subject to a federal mandate to implement Positive Train Control (PTC) technology by the end of 2015. The industry is in the midst of a comprehensive development effort to realize this technology. A central component of PTC is wireless communications. The industry has identified 217-222 MHz as the band of operation for PTC, and some 220-222 spectrum licenses have already been acquired by an industry group. A concerted effort is underway to develop a radio specifically for this application, and we expect to have an authorized radio in early to mid 2011. However, as part of our deployment planning, we need to characterize the performance and propagation of modulated 220 MHz signals by doing field tests this year.”

• The Graduate School of Oceanography, University of Rhode Island, filed an application (with supporting exhibits) for experimental license to operate high-frequency Coastal Ocean Dynamics Applications Radar (CODAR) to map surface ocean currents. Operation was to be on several frequencies between 24.615 and 26.475 MHz. The FCC rejected the application, saying that CODAR is currently being reviewed for its potential as a service requiring a frequency allocation. Until that determination is made, there will be no more experimental authorizations.

• Rockwell Collins filed an application (with supporting exhibits) for experimental license to conduct experiments to test waveforms for high speed data over high-frequencies. Testing is to include characterization of performance and actual wideband channel propagation characteristics. Rockwell Collins says it is a member of the Technical Advisory Committee for MIL-STD-188-110C and MIL-STD-188-141C standards revisions and new standard definitions, and the experimental authorization will enable verification of performance and inter-operability metrics in the standards. Operation is to be on many frequencies between 2.398 and 29.720 MHz.

• Rockwell Collins also filed an application (with supporting exhibits) for experimental license to test a prototype transmitter (as part of a transceiver) for the Automatic Dependent Surveillance-Broadcast (ADS-B) system, a surveillance technique for air traffic control and similar uses. The company intends to conduct mobile ground testing in and around the Rockwell Collins’ facilities in Cedar Rapids, Iowa. Operation is to be on several frequencies between 977 and 1096 MHz.

• SpectrumBridge filed an application (with supporting exhibits) for experimental license to test the usefulness of white space spectrum for use in telemedicine applications – indoor telemetry, medical records exchange, M2M applications, and enhanced wireless broadband access for doctors, patients, and visitors residing within a hospital campus. Testing is to be done in association with Hocking Valley Community Hospital in Logan, Ohio. The requested frequency band is 470-698 MHz.

• Western DataCom filed an application (with supporting exhibits) for special temporary authority to conduct a test of extending cellular telephone coverage on the waters of Lake Erie. Operation is to be on 2353.5-2370.0 MHz. The base station would operate from a tethered aerostat (helium balloon system) at 1000-1400 feet above ground.

• Keurig, Inc. filed an application for special temporary authority to test a coffee brewing system that uses RFID technology to adjust brewing parameters in accordance with the beverage being prepared. Operation is to be on 902-928 MHz. This application was granted on August 7.

• Columbia University filed an application (with supporting exhibits) to operate WiMAX equipment on 2535-2540 MHz in support of the GENI project. The application was approved on August 11.

Raytheon Missile Systems files an application and supporting exhibit requesting Special Temporary Authority to use Freewave radios on an aircraft in support of a test to verify the accuracy and effectiveness of aircraft radar. The plan is to transmit the position information from the tracked aircraft to the tracking aircraft, and verify that the position information determined by the radar is in sync with the actual position of the tracked aircraft. (1.35-1.39 GHz)

Orbital Sciences files an application for Special Temporary Authority to operate an S-band telemetry link in support of satellite launch vehicle testing. The link will communicate from ground with the NASA Track and Data Relay Satellite System (TDRSS). (2211 MHz)

BAE Systems files an application and supporting exhibit for a new Experimental Radio license for operation on 290 and 391 MHz. The testing involves the development and evaluation, under a DARPA contract, of an experimental RF waveform and demodulation protocol. A prototype system will be demonstrated in which users use the same spectrum at the same time without any centralized control or infrastructure. BAE calls it a “new paradigm of interfering on purpose” that is intended to enhance system performance and throughput of the communications system. BAE expects that systems built in this manner will not need to rely upon spatial, temporal, or frequency orthogonality among users to keep signals from interfering.

Virginia Tech files an application and supporting exhibits to operate a multi-point indoor radio experimental network called CORNET. CORNET is described as an open cognitive radio network testbed that will allow evaluation of independently-developed cognitive radio engines, sensing techniques, applications, protocols, performance metrics, and algorithms in a real-world wireless environment. The system will have 48 nodes distributed among 4 floors. Testing will be done on various frequencies between 138 and 3600 MHz.