MC-CDMA系统部分频带干扰抑制性能研究

对MC-CDMA系统和部分频带干扰进行了建模,推导给出了常规MC-CDMA系统以及频域随机交织和卷积编码情况下的等增益软、硬判决合并的理论误码率表达式,计算机仿真发现,（1）集中功率进行有效干扰可以获得最好的干扰效果,（2）由于采用了频域扩频,MC-CDMA系统的部分频带干扰抑制性能要远好于OFDM系统,（3）在频域随机交织情况下,软判决合并的性能并不总是好于硬判决合并,并且采用自由距离较大的卷积编码也可以获得很好的干扰抑制效果.

Performance of Partial Band Jamming Suppression in MC-CDMA

MC-CDMA systems and partial band jamming were modeled,and further BER formulae under two conditions were theoretically deduced when equal gain combination is used in the receiver,which was proved by MATLAB simulations.One condition was in normal MC-CDMA systems,and the other was that the systems employed frequency interleave and convolutional coding.Conclusions show that,(1) the strategy of concentrating jamming power must be taken to achieve the best jamming effect,(2) the performance of partial band jamming suppression in MC-CDMA systems is much better than that in OFDM systems due to the usage of frequency spread,(3) the performance of soft decision is not always better than that of hard decision when random frequency interleave is introduced,and excellent jamming suppression performance can also be achieved when convolutional coding with large free distance is performed.