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Turbo码可为数字通信系统提供接近信道容量的纠错能力 ,其迭代译码算法的收敛稳定性是算法能否实用的关键因素之一。针对短长度交织器对随机错误扩散能力弱带来的迭代收敛稳定性差的问题 ,在Turbo码的常用迭代译码方法的基础上加以改进 ,利用前后两次迭代序列的信息熵引入迭代步进因子以改善迭代译码的收敛特性。给出了迭代步进因子的产生方法并进行了计算机仿真 ,仿真结果表明 ,该方法可有效改善短交织长度时Turbo码的迭代译码收敛特性
Turbo codes can provide digital communication system with error correction capability close to the channel capacity. The convergence stability of iterative decoding algorithm is one of the key factors that make the algorithm practical. Aiming at the poor stability of iterative convergence caused by weak error diffusion ability of short interleaver, this paper improves on the common iterative decoding method of Turbo codes, and uses the information entropy of two iterative sequences to introduce iterative step factor To improve the convergence of iterative decoding. The generation method of iterative step factor is given and the computer simulation is carried out. The simulation results show that this method can effectively improve the convergence property of iterative decoding of Turbo codes with short interlacing length