Performance of optimum and suboptimum OFDM-CPM receivers over multipath fading channels

Abstract

A class of orthogonal frequency division multiplexing-continuous phase modulation (OFDM-CPM) signals is introduced in which binary data sequence is mapped to complex symbols using the concept of correlated phase states of a CPM signal. Canonical optimum and suboptimum multiple-symbol-observation OFDM-CPM receivers are derived. Multipath channel with AWGN is assumed. The receivers are analyzed for bit error rate (BER) performance in terms of high- and low-SNR bounds. These bounds are illustrated as a function of parameter h, time delay and attenuation level. It is shown that OFDM-CPM systems, with h = 0.5,0.25 and an observation interval length of two symbols, can outperform conventional OFDM-PSK system for a two-ray multipath model. © 2005 John Wiley & Sons, Ltd.