An Analysis of Electromagnetic Interference (EMI) of Ultra Wideband(UWB) and IEEE 802.11A Wireless Local Area Network (WLAN) Employing Orthogonal Frequency Division Multiplexing (OFDM)
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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Military communications require the rapid deployment of mobile, high-bandwidth systems. These systems must provide anytime, anywhere capabilities with minimal interference to existing military, private, and commercial communications. Ultra Wideband UWB technology is being advanced as the next generation radio technology and has the potential to revolutionize indoor wireless communications. The ability of UWB to mitigate multipath fading, provide high-throughput data rates e.g., greater than 100 Mbps, provide excellent signal penetration e.g., through walls, and low implementation costs makes it an ideal technology for a wide range of private and public sector applications. Preliminary UWB studies conducted by The Institute for Telecommunications Science ITS and the Defense Advanced Research Projects Agency DARPA have discovered that potential exists for harmful interference to occur. While these studies have provided initial performance estimates, the interference effects of UWB transmissions on coexisting spectral users are largely unknown. This research characterizes the electromagnetic interference EMI effects of UWB on the throughput performance of an IEEE 802.11a ad-hoc network. Radiated measurements in an anechoic chamber investigate interference performance using three modulation schemes BPSK, BPPM, and OOK and four pulse repetition frequencies over two Unlicensed National Information Infrastructure U-NII channels. Results indicate that OOK and BPPM can degrade throughput performance by up to 20 at lower pulse repetition frequencies PRFs in lower U-NII channels. Minimal performance degradation less than one percent due to interference was observed for BPSK at the lower PRFs and higher U-NII channels.
- Test Facilities, Equipment and Methods
- Logistics, Military Facilities and Supplies
- Radio Communications
- Command, Control and Communications Systems