Performance studies of an over-sampling multi-channel equalizer for a multi-band UWB system

By dividing the available spectrum into multiple bands, the multi-band ultra-wideband (UWB) system possesses many advantages, such as lower design complexity, lower power consumption, lower cost, improving spectral flexibility and worldwide compliance. RAKE receiver, as one of the most popular solution, is used to capture multipath energy and mitigate inter-symbol interference (ISI). In this paper, we propose an over-sampling multi-channel equalizer per sub-band for a multi-band UWB system. The over-sampling multi-channel equalizer provides more effective ISI suppression compared with RAKE receiver when operating in channels with large delay spread. In the presence of multiple uncoordinated piconets, the choice of time-frequency hopping sequence for the proposed equalizer has been investigated. The intensive simulations have been performed and the results show that a random sequencing among piconets is sufficient for the proposed equalizer to support multiple piconets.