采用迭代处理的多用户联合检测和译码方案

Turbo Processing in Joint Multi-User Detection and Decoding

将迭代 (Turbo)处理的思想应用于多用户检测和译码中 ,通过软输入软输出 (SISO)算法使二者能利用对方在上一轮运算中的比特对数似然比 (LLR)信息 ,用迭代递归的方法逐渐逼近单用户性能 ,减少多址干扰的影响 .仿真结果给出了迭代处理方法在不同信噪比条件下的比特误码率性能 。

Practical DS/CDMA systems often employ the error control coding and interleaving, the decoding performance will be affected if using hard decision output of Multi-User Detector (MUD). This paper applied the turbo processing method into multi-user detection and channel decoding, the Log-Likelihood-Ratio (LLR) output of each iteration was used as a priori information in the next iteration, thus to approach the single-user performance and suppress the influence of multi-access interference (MAI). The simulation results show the BER performance under different signal-to-noise ratio which proves the improvements of received data quality.