performance evaluation of mb-ofdm based uwb system

this paper investigates the multi-band ofdm (mb-ofdm) based physical (phy) layer proposal for ieee 802.15.3a working group on short-range high data-rate ultra-wide-band (uwb) communications. an overview of the mb-ofdm phy layer architecture with its various parameters is presented and the optimal choice of critical parameters is discussed. next, we derive the theoretical un-coded bit error rate (ber) of mb-ofdm over the rayleigh fading channel. performance results over realistic ieee uwb channel models are analyzed and compared to a pulsed-ofdm based approach.  although pulsed-ofdm was presented in the literature as an enhancement to the mb-ofdm approach, simulation results showed that with same redundancy-factor, both systems give almost similar ber performance.