摘要
简要介绍了TCM技术的原理,以误差序列的欧氏重量为度量,改进了传统编码方案中自由欧氏距离的算法,并且通过简化条件译码概率的计算对Viterbi最大似然译码算法进行了优化,从而提高了整个系统的抗噪声性能。最后通过MATLAB仿真验证了该方案具有较高的渐近编码增益,更逼近理论限。
This thesis briefly introduces the theory of TCM. By using the Euclidean Weight of error sequences as the coding metric, it improves the algorithm of the Free Euclidean Distance in traditional coding schemes,and it also optimizes the Viterbi Maximum-Likelihood decoding algorithm by simplifying the calculation of the conditional decoding probability, such that the performance of the whole system gets improvements. Finally, it proves that this scheme will get higher asymptotic coding gain on MATLAB simulation, and the result gets closer to the asymptotic limit on theory.
出处
《通信技术》
2005年第S1期45-48,共4页
Communications Technology
关键词
网格编码调制
16-QAM
自由欧氏距离
条件译码概率
trellis-coded modulation
16-QAM
free Euclidean distance
conditional decoding probability
