基于CDMA系统的低复杂度预均衡技术

摘要

Facing the complex wireless channel interference ,a modified method was proposed ,namely zero-forcing frequency do-main pre-equalization (ZF Pre-FDE) ,which can eliminate the effect of interference brought by the frequency selective channel used in transceivers of the system .The bit error rate (BER) was compared among the proposed method and traditional methods . An simulation example was presented to prove that the proposed equalization technique can improve the BER performance better , and using singular value decomposition (SVD) ,the complexity is reduced ,consequently demonstrates the feasibility of the tech-nique and the effectiveness of the algorithm .%面对复杂的无线信道干扰，提出一种低复杂度的频域预均衡技术，即迫零频域预均衡（zero-forcing frequency do-main pre-equalization ，ZF Pre-FDE）。应用基于此技术的收发器能够消除频率选择性信道带来的干扰效应，在传输误码率方面也较传统收发器有所改善。通过计算机仿真比较了所选方法与传统方法在同样环境中的误码率，仿真结果表明，基于此均衡技术的收发器能够很好地改善系统误码性能，利用奇异值分解，降低了实现的复杂度。