Abstract: In order to improve the performance of the MMSE (minimum mean squared error) turbo equalizer further, the MMSE turbo equalization with partial prior information is proposed. The partial prior information equals to the sumof the whole extrinsic information and the partial prior information of the MAP(maximum a posteriori probability) decoder. The simulation results show that the performance of the MMSE turbo equalizer with partial prior information is much better than the performance of the conventional MMSE turbo equalization and is very close to the performance of the MAPturbo equalizer which is the optimal turbo equalizer for minimizing the bit error rate (BER) and the frame error rate (FER).

Key words: turbo equalization, iterative receiver, MMSE criterion

摘要： 为了进一步提高MMSE turbo均衡的性能, 提出一种新型均衡器组合式先验信息。该均衡器以MAP译码器的完整输出外信息和MAP译码器的部分先验信息之和作为先验信息。仿真结果表明, 在不增加任何计算复杂度的前提下, 采用组合式先验信息的MMSE turbo均衡性能明显好于传统MMSE turbo均衡, 并且十分接近MAP turbo均衡的性能(MAP turbo均衡是最小误帧率和最小误码率意义下的最佳均衡算法)。

关键词: turbo均衡, 迭代接收, MMSE准则