The conclusion is identified by computer simulation . the paper studies a noncoherent demodulation based on differential encoding in mc - cdma system and makes computer simulation of ber performance compared with that of coherent demodulation based on perfect channel estimation 研究分析了一种使用差分编码的非相干接收mc - cdma系统,对频率选择性瑞利衰落信道条件下的误码率性能进行了计算机仿真,并且和基于理想信道估计的相干解调方案进行了比较。