基于比特交织和调制分集的Turbo乘积编码调制系统性能

将比特交织和调制分集引入到Turbo乘积编码调制中，提出一种具有良好抗衰落性能的编码调制机制。分析了该机制的误比特率性能，导出了适合迭代译码的软输入软输出（SISO）度量算法，给出了一种简单有效的星座旋转角度设计方法。仿真结果表明，与传统Turbo乘积编码调制相比，该机制在瑞利衰落条件下可获得2.5dB以上的编码增益。为Turbo乘积码和高效调制结合应用于无线通信系统提价节良好的解决方法。

Performance Analysis of Turbo Product Coded Modulation Based on Bit Interleaving and Modulation Diversity

A new turbo product coded modulation scheme, which combines the techniques of bit interleaving and modulation diversity, was presented. The bit error rate performance of this scheme was analyzed. The algorithm of soft input soft output bit metric calculation was derived and a simple method for optimizing the constellation rotation angle was given. The simulation of results show that the proposed scheme can obtain the coding gains of more than 2.5dB compared with the conventional turbo product coded modulation schemes in Rayleigh fading channel at the cost of little complexity increment.It is a suitable scheme applied to the spectrum efficient wireless communication system.