格码调制与自适应判决反馈均衡联合DSP实现

DSP Implementation Depending on Combination of TCM and Adaptive Decision Feedback Equalizers

本文在介绍TCM基本思想的基础上,给出了TCM与自适应周期训练方式的判决反馈均衡相结合的方法,对系统在高斯信道中的性能进行了仿真,给出了用浮点DSPTMS320VC33实现TCM的维特比译码的具体步骤。与线性均衡的比较结果表明判决反馈均衡具有很大优势,从而能实现窄带信号的高速传输。

The principle of Trellis Coded Modulation is introduced, the method of combination of TCM and adaptive training periodically decision feedback equalizers comparing with linear equalizers is given, and a computer simulation of the performance of the system over AWGN channel is presented, and the viterbi decoding of TCM with TMS320 VC33 is implemented. The results show that decision feedback equalizers have better performance than linear equalizers and it makes high speed data transmit over band limited channel.