Performance enhancement of an MB/spl I.bar/OFDM based UWB system in multiple SOPs environments

In this paper, we propose a new transmission scheme to support multiple simultaneously operating piconets (SOPs) in an ultra wideband (UWB) system based on multi-band orthogonal frequency division multiplexing (MB/spl I.bar/OFDM), where the code division technique is combined with the MB/spl I.bar/OFDM. When there are 2 or 3 SOPs, the collision between different piconets is increased and the average probabilities of symbol collision increase up to nearly 55.7% and 70.7%, respectively. Hence, the previous scheme using symbol repeater and erasure can't effectively reduce the co-channel interference (CCI). We propose to use the MC/spl I.bar/CDMA to mitigate the CCI from 2 and 3 SOPs. Our simulation results demonstrate that the proposed scheme is effective in multiple SOPs.