一种MC-CDMA中的预均衡处理算法

本文提出了一种应用于频域扩展多载波码分多址系统中的预均衡(F-PE)处理算法。在频率选择性瑞利慢 衰落条件下,各个用户根据基站通过反馈信道反馈回来的信道衰落信息对发射信号进行预处理,从而提高基站的接收效果。 通过对接收机判决变量输出分析,表明F-PE算法有效恢复了扩展码之间的正交性而没有增加噪声功率,很好的改善了误 码率性能。仿真结果证明了理论分析结果,表明F-PE算法性能无论在同步还是异步信道中都优于EGC、MRC和ORC方 法。

A Feedback Pre-equalization Method in a MC-CDMA

In this paper, we propose a feedback pre-equalization (F-PE) method based on channel estimation in a uplink channel of MC-CDMA system. In a frequency-selective Rayleigh slow fading channel, base station can estimates fading coefficient of channel, and transfers it to transmitter by feedback channel. The pre-equalization is performed by transmitter depend on fading coefficient. So, the performance of base station receiver is improved. Through analyzing decision variable of receiver, the F-PE method restores orthogonality of users' spreading sequence, and doesn't increase the power of noise, so it improves the BER performance. The conclusion is identified by computer simulation. The F-PE method shows the best BER performance among EGC, MRC, and ORC methods both in synchronous and asynchronous channel.