Abstract
Ultra-wideband (UWB) is a useful radio technique for sharing frequency bands between radio systems. It uses very short pulses to spread spectrum. However, there is a potential for interference between systems using the same frequency bands at close range. In some regulatory systems, interference detection and avoidance (DAA) techniques are required to prevent interference with existing radio systems. In this paper, the effect of interference on orthogonal frequency division multiplexing (OFDM) signals from pulse-based UWB is discussed, and an interference mitigation technique is proposed. This technique focuses on the pulse repetition cycle of UWB. The pulse repetition interval is set the same or half the period of the OFDM symbol excluding the guard interval to mitigate interference. These proposals are also made for direct sequence (DS)-UWB. Bit error rate (BER) performance is illustrated through both simulation and theoretical approximations.
Highlights
Spectrum sharing technologies are attractive since there is a real lack of frequency bands for radio systems
The proposed template is effective for narrowband interference such as that produced by existing wireless local area networks (LANs) systems, and for wideband interference such as that produced by MB-orthogonal frequency division multiplexing (OFDM)
Notice that Bit error rate (BER) performances become better in both coexisting systems MBOFDM and IEEE802.11a WLAN when the pulse repetition interval is equal to the OFDM IFFT/FFT duration or half that of the IFFT/FFT
Summary
Spectrum sharing technologies are attractive since there is a real lack of frequency bands for radio systems. The effect of interference from UWB on narrow band systems has been evaluated by hardware experiments and computer simulations [5,6,7]. The proposed template is effective for narrowband interference such as that produced by existing wireless LAN systems, and for wideband interference such as that produced by MB-OFDM. This is achieved using a multicarrier template and hopping band detection [12]. A technique to mitigate interference on OFDM signals from pulse-based UWB (p-UWB) is examined using a physical layer approach.
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