Archive for the ‘Propagation’ Category
Tuesday, October 14th, 2014
On October 13 Google filed two experimental radio applications with the FCC. The first seeks permission to test in the 3.5 GHz band in Mountain View, California and in suburban Washington D.C. The second is for testing in the 5.8, 24, 72, and 82 GHz bands in Mountain View and San Mateo County, California. The applications are redacted. Most technical detail is unavailable, but here’s what’s visible.
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Posted in 3.5 GHz, Google, Millimeter-wave, Propagation | No Comments »
Wednesday, July 16th, 2014
The interaction of radio waves in free space has never been much of a concern to this wireless engineer. Propagation models do a pretty good job of estimating received signal strength. Receivers are designed to select desired signals and reject undesired ones, within limits. “Interference takes place in the receiver,” I’ve heard more than once. Yes, there are a lot of signals in the air at once, but I’m more interested in the end result.
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Posted in Electromagnetics, Propagation | No Comments »
Thursday, January 3rd, 2013
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during September-December 2012. These are related to LF and HF propagation, cognitive radio, satellite telemetry, ultra-wideband (UWB), ground-penetrating and synthetic-aperture radar, mobile broadband, aerial communications (balloons), LTE, managed access, military communications, Wi-Fi, GPS, sensor networks, and MVDDS. The descriptions are sorted by the lowest frequency in the application.
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Posted in 3G, 4G, Ad-hoc Networks, Aviation, Backhaul, Cognitive Radio, Contraband Cell Phones, Electronic Warfare, Experimental, GPS, Ground Penetrating Radar, Heterogeneous Networks, High Frequency, Low Frequency, LTE, Managed Access, Medium Frequency, Military, Mobile Broadband, MVDDS, Propagation, Radar, Satellite, Sensors, Space Communications, Synthetic Aperture Radar, Telemetry, Ultra-wideband, Uncategorized, Wi-Fi | No Comments »
Wednesday, July 18th, 2012
This summarizes a selection from 289 applications for the Experimental Radio Service received by the FCC during April, May, and June 2012. These are related to AM, high-frequency propagation, ultra-wideband, frequency-hopped VHF, managed access, small satellites, radar, MIMO, TV white space, low-power FM, stadium wireless service, GSM, and DTV. The descriptions are sorted by the lowest frequency found in the application.
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Posted in 4G, AM Broadcasting, Antennas, Aviation, CMRS, Cognitive Radio, Contraband Cell Phones, DTV, Dynamic Spectrum Access, Electronic Warfare, Equipment Authorization, Experimental, FCC, GSM, High Frequency, Interference, Jamming, Managed Access, Military, Mobile Broadband, Private Radio, Propagation, Radar, Satellite, Small Cells, Software Defined Radio, Space Communications, T-Mobile, TV Broadcasting, UAS, UAV, Ultra-wideband, Uncategorized, Unlicensed, White Space, Wi-Fi | No Comments »
Monday, April 2nd, 2012
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during January, February, and March 2012. These are related to radar, Amateur Radio, spread spectrum, white space, spacecraft telemetry, propagation testing, satellites, smart grid, femtocells, machine-to-machine communications, ad hoc networks, 4G backhaul, electronic warfare, and robotics. The descriptions are listed in order of the lowest frequency found in the application.
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Posted in 3G, 3GPP, 4G, Ad-hoc Networks, Amateur Radio, Antennas, Automotive, Aviation, Backhaul, Bluetooth, Broadband Access, Electronic Warfare, Experimental, Femtocells, High Frequency, IEEE 802, IMT-Advanced, Interferometry, LTE-Advanced, M2M, Millimeter-wave, Mobile Broadband, Propagation, Radar, Satellite, Sensors, Smart Grid, Space Communications, Telemetry, Uncategorized, White Space, Wi-Fi | No Comments »
Sunday, February 5th, 2012
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, managed access, TV interference, RFID, and radar. The descriptions are listed in order of the lowest frequency found in the application.
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Posted in AM Broadcasting, Amateur Radio, Antennas, Automotive, Aviation, Backhaul, Bluetooth, Boosters, Contraband Cell Phones, Dynamic Spectrum Access, Electronic Warfare, Experimental, FCC, FM Broadcasting, GPS, High Frequency, Interference, Managed Access, Maritime, Military, Millimeter-wave, Mobile Broadband, Modulation/Demodulation, Propagation, R&D, Radar, RFID, Satellite, Sensors, Space Communications, Spectrum, Telemetry, Terminals, TV Broadcasting, UAV, Unlicensed, White Space, Wi-Fi, WiMAX | No Comments »
Sunday, November 6th, 2011
This summarizes a selection from 173 applications for the Experimental Radio Service received by the FCC during August and September 2011. These are related to long-range low-frequency radar, amateur radio, shortwave data, wireless microphones, single-sideband, mine detection, millimeter-wave communications, signal intelligence, automotive radar, satellite feeder links, meteor-burst communications, aircraft telemetry, white space systems, border security radar, 3G and 4G applications, RFID, wind turbine testing, unmanned aerial vehicles, spacecraft telemetry and control, aircraft passenger broadband, and autonomous aircraft landing systems. The descriptions are sorted by the lowest frequency found in the application.
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Posted in 3G, 3GPP, 3GPP2, 4G, Amateur Radio, Antennas, Automotive, Aviation, Broadband, Cognitive Radio, Electronic Warfare, Experimental, FCC, GPS, High Frequency, IEEE 802, IMT-Advanced, Military, Millimeter-wave, Mobile Broadband, Mobile Services, Propagation, Radar, Radiolocation, RFID, Satellite, Smart Grid, Software Defined Radio, Space Communications, Spectrum, Telemetry, Terminals, UAS, UAV, UMTS, White Space, WiMAX | No Comments »
Saturday, May 14th, 2011
Recent contributions to the mobile broadband spectrum debate are reports from NAB and CTIA. I envisioned a “dueling reports” piece, but they mostly complement each other. Below I walk through the main points, adding some of my own views.
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Posted in 3GPP, 4G, Antennas, Backhaul, DTV, Femtocells, Infrastructure, Interference, LTE, LTE-Advanced, Mobile Broadband, Modulation/Demodulation, National Broadband Plan, NTIA, Picocells, Propagation, Spectrum, TV Broadcasting | No Comments »
Wednesday, April 13th, 2011
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during March 2011. These are related to VHF propagation, satellite communications, TV white space, military communications, radar, software defined radio, aircraft broadband services, adaptive networks, peer-to-peer networks, intermodulation testing, unmanned aircraft systems, maritime broadband communications, border surveillance, target acquisition, and millimeter wave propagation. The applications are sorted by frequency.
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Posted in Ad-hoc Networks, Amateur Radio, Antennas, Aviation, Broadband, Cognitive Radio, Electronic Warfare, Experimental, Femtocells, FM Broadcasting, GSM, Interference, Intermodulation, Maritime, Military, Millimeter-wave, Peer-to-Peer, Picocells, Propagation, Public Safety, Radar, Satellite, Sensors, Software Defined Radio, Space Communications, Spectrum, Telemetry, Terminals, UAS, Video, White Space, Wi-Fi, WiMAX | No Comments »
Wednesday, March 2nd, 2011
To avoid interference, wireless transceivers can switch between transmit and receive on one frequency (Time Division Duplex (TDD)). Or, they can transmit and receive at the same time on different frequencies (Frequency Division Duplex (FDD)). There’s been a flurry of press reports about a new radio system, developed by Stanford researchers, that can operate full duplex on a single channel; that is, transmitting and receiving at the same time on the same frequency, something not done before.
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Posted in Antennas, Cognitive Radio, Hidden Node, IEEE 802, Interference, Latency, Modulation/Demodulation, Propagation, R&D, Spectrum | No Comments »
Wednesday, February 9th, 2011
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during January 2011. These are related to land mobile radio, VHF propagation study, satellite communications, network-centric warfare, TV white space, software defined radio (SDR), military command and control, remotely piloted aircraft, LTE, radio direction finding, OpenBTS, Identification Friend or Foe (IFF), peer-to-peer communications, flight test telemetry, automotive telemetry, WiMAX, surveillance radar, vehicle radar systems, and millimeter-wave communications.
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Posted in 3GPP, 3GPP2, 4G, Ad-hoc Networks, Antennas, Automotive, Aviation, Broadband, Broadband Access, Electronic Warfare, Experimental, GPS, GSM, High Frequency, Land Mobile, Location, LTE, Military, Millimeter-wave, Peer-to-Peer, Propagation, Public Safety, Radar, Radiolocation, Satellite, Space Communications, Spectrum, Telemetry, Terminals, TV Broadcasting, UAV, White Space, Wi-Fi, WiMAX, Wireless | No Comments »