A new transceiver design for multi-band UWB system

Pulse position modulation (PPM) and rake receivers are usually used in single-band ultra-wideband (SB-UWB) systems. For multi-band ultra-wideband (MB-UWB) systems, we propose a new transceiver design based on spectral keying (SK) modulation. We develop a blockwise multipath channel model represented by a finite impulse response (FIR) filter bank for MB-UWB systems. At the transmitter end, an SK-modulated information symbol is sent through a sequence of P sub-symbol pulses that have distinct frequencies. At the receiver end, a minimum mean square error (MMSE) receiver bank followed by a simple mapping-based decision block is used to detect the received signals. Our scheme can increase the data rate by reducing the guard time between sub-symbol pulses aggressively and improve the system performance by blocking the coefficients of the channel impulse response (CIR) into vectors, while keeping the frequency diversity gain resulting from MB-UWB. Computer simulations illustrate the transceiver design and its effectiveness.