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In this paper, the authors present a simple and fast Detect And Avoid (DAA) algorithm for non-coherent multiband impulse radio UWB. By independent parallelized interception of all subbands, this algorithm shows a very robust and reliable behavior in the detection of narrowband interference such as the IEEE 802.11a Wireless LAN (WLAN) standard. Thereby, narrowband interference detection is possible during an initialization mode but also during data transmission. The detection is based on a static threshold which guarantees a maximum bit error rate in each subband. If a narrowband interferer is present the transmission is avoided on the corresponding subband and a receiver known initialization sequence is transmitted.
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