卷积码及其维特比译码算法的软件实现  

Software Method of Implement Convolutional Code and Its Viterbi Decoding Algorithm

作　　者：徐超颖[1] 杨国安[1] 石永光 郑南宁[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《西安交通大学学报》2003年第2期151-154,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(60024301).

摘　　要：提出了数字通信系统中在信道受到干扰时信道译码器检测或修正解调器送来错误信息的一种软件实现方案,该方案应用VisualC++6 0软件技术实现了卷积码编码器和维特比译码器功能,它不仅译码算法简单、易实现,而且可以得到较大的编码增益,具有良好的纠错编码功能,是一种软件方法的前向纠错编码技术.实验结果表明:应用软判决维特比译码算法时的误码率低于应用硬判决算法的误码率,一般要比硬判决算法多大约2dB的增益;约束长度越大误码率越低,译码性能越好;在码率和约束长度不变时,硬判决算法的执行速度比软判决算法快.目前,该方案已应用于高精度网络彩色激光打印机中,并获得好评.A software implementation of a channel coding technology using visual C++60 is presented, which ralizes the functions of convolutional coding and Viterbi decoding. This software has the advantages of a simple decoding algorithm, and a larger coding gain and provides a better error correcting performance, which belongs to a forward error correction coding technology. The experimental results show that the bit error rate of the softdecision Viterbi decoder is lower than that of harddecision with a larger gain of 2 dB.The bigger the constraint length, the lower the bit error rate and the better the decoding performance becomes. When the code rate and constraint length remain constant, the speed harddecision algorithm is higher than that of softdecision. At current stage, the scheme proposed here has been used in the highprecision network color laser printer and wins favourable comments from the users

关 键 词：卷积码 维特比译码算法 硬判决 软判决 数字通信系统 纠错编码 误码率 

分 类 号：TN911.22[电子电信—通信与信息系统]