单径慢衰落信道模型中带有频差的NOrth-MDPSK性能评估

针对Ⅳ进制正交扩频和MDPSK复合调制（NOrth-MDPSK），分析了单径慢衰落信道模型中带有频差时的误比特率。首先运用全概率定理和马尔可夫链，建立了性能分析的统一框架；在此框架下，推导了AWGN、瑞利衰落和Nakagami-m衰落信道中的误比特率公式。数值结果表明，与单纯NOrth相比，NOrth-MDPSK以较低的性能损失代价，提供了更高的带宽效率。

Performance evaluation of NOrth-MDPSK with frequency offset insingle path slow fading channel model

Focusing on combined N-ary orthogonal spread spectrum and M-ary differential phase shift keying(NOrth-MDPSK),this paper investigates the bit error rate(BER) with frequency offset in single path slow fading channel model.First the overall probability theorem and Markov chain were applied to establishing a unified framework for performance evaluation,and under this framework,the BER formulas for AWGN,Rayleigh and Nakagami-m fading channels were derived.Numerical results show that NOrth-MDPSK provides higher bandwidth efficiency at the cost of very low performance loss when compared with pure NOrth.