Detection techniques for enhanced FQPSK signals

This paper investigates receiver structures for enhanced FQPSK modulation. A new receiver structure called the per waveform matched filter (PWMF) receiver is introduced. The bit error rate performance of averaged matched filter receiver, optimal linear MMSE receiver, PWMF receiver and the optimal receiver based on the Viterbi algorithm is studied for uncoded and coded EFQPSK signals with and without a nonlinear power amplifier. Our study shows that the various structures provide complexity performance trade off and their performance is little degraded due to the presence of the nonlinear amplifier. A low complexity receiver structure for Rayleigh frequency-flat fading channels is also investigated and is found to perform well