Performance analysis of filtered PSM signal using non-matched receiver for UWB communication

Abstract

Pulse shape modulation (PSM) is new and one of the best modulation scheme for Ultra-wideband (UWB) communication due to its low interference, multi-dimension data transmission and asynchronous demodulation features. The PSM scheme uses orthogonal pulses for data transmission as reported in the UWB literature. It is also known that the pulse geometry can change significantly by passing through a filter. This filter can be represented as an amplifier, transceiver antenna effect, pulse shaping filter, frequency selective pulse shape distortion, multipath channel and other system model effects. In this paper, theoretical analysis of the bit error rate (BER) performance of filtered 2-ary PSM signal has been carried out and verified with simulation results. Due to filter effect, the transmitted pulses are no longer orthogonal at the receiver, therefore design of the matched receiver is complex. In literature, a non-matched receiver is suggested, which is valid only for composite Hermite pulses (CHP) and has high bit error probability. A simple non-matched receiver for orthogonal pulses for PSM scheme in UWB communication is proposed, which is valid for CHP and other orthogonal pulses. The proposed non-matched filter receiver is simple and can be used for both filtered and non-filtered PSM signals demodulation as verified by the simulations.