A dual N-ary orthogonal hybrid modulation system is introduced in this paper, which can increase the data rate greatly compared with conventional N-ary orthogonal spread spectrum system, so it can be used for high rate data communication. Then, three code recognition algorithms are presented for dual N-ary orthogonal hybrid modulation system and the analytic bit error rate （BER） performance of the system in additive white Gaussian noise （AWGN） and fiat Rayleigh fading channel is derived. Finally, the computer simulation of the system with three code recognition algorithms is performed, which shows that the simplified maximum a posteriori （MAP） algorithm is the best for the system with a compromise between the performance and the complexity.
针对N进制正交扩频和MDPSK复合调制(N O rth-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AW GN、瑞利衰落和N akagam i-m衰落信道中的误比特率公式。数值结果表明,与单纯N O rth相比,N O rth-MDPSK以较低的性能损失代价,提供了更高的带宽效率。
