Multi-phase shift keying modulation using generalised array codes

Abstract

In this paper a Block Coded Modulation (BCM) scheme employing Generalised Array Codes (GAC) and M-ary Phase Shift Keying (MPSK) modulation technique is proposed. The GAC are encoded in the usual manner. The encoded data are then used to modulate the signals varying in phase. A maximum likelihood trellis decoding technique is used to demodulate/decode the received symbols. Simulation study results show that BCM employing GAC codes and QPSK modulation in AWGN channel yield 5dB or more coding gain over the  corresponding uncoded case. Further as M increases the coding gain decreases over the corresponding uncoded case as expected.

Keywords: Coding and modulation, trellis decoding.