Performance of a Coded Non-Square Quadrature Amplitude Modulation Scheme over Fading Channels

摘要: It is shown that a non-square (NS) 2 2n+1 -ary quadrature amplitude modulation (QAM) can be decomposed into single-parity-check (SPC) block encoder and memoryless modulator with independent in-phase (I) (Q) symbol mapping. When NS-2 -QAM concatenated forward-errorcorrecting (FEC) code, iterative demodulation decoding of the FEC code inherent SPC exploits modulation’s memory its I- Q-channel mapping demapping. The capacity bit-/symbol-error-rate (BER/SER) performance coded uncoded systems are given for both additive white Gaussian noise (AWGN) channels Rayleigh fading compared to those other conventional systems. Simulation results show that, decoding, NS-8QAM outperforms three 8-ary by at least 0.65 dB on AWGN 0.57 BER = 10 −5 , when concatenation (15,11) Hamming codes rate-1 accumulator codes, while NS-32QAM standard 32QAM about 0.45 0.27 channels.