Orthogonal Multicode Channelization Applied to Subsampling Digital UWB Receiver

This paper assesses in AWGN and dense multipath environments several equalization alternatives for a digital pulsed UWB receiver sampling below Nyquist rate. A suboptimal but implementation efficient minimum mean-square error (MMSE) equalizer which reaches performances similar to the ideal MMSE equalizer is proposed. By making an efficient use of orthogonal codes, the UWB transceivers have flexible channelization means to accomodate time-varying data rate in the order of magnitude of 100 Mb/s with sampling rates below 1 GHz. The proposed multicode approach takes into account the peculiarities of pulsed UWB signals and avoids high peak-to-average amplitude ratios