【摘要】 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更多还原

【Abstract】 Turbo codes is an effective method for digital communication systems to get near channel capacity error correcting performance, its iteration convergence performance is the key factor for practicability. Based on the universal decoding method of Turbo codes, a step increment factor was introduced in the paper to improve the iteration convergence performance. The method to generate the step increment factor was also presented as well as its’ computer simulations. Simulation results show the method proposed can improve the convergence performance efficiency for Turbo codes with short interleaver.更多还原