级连码在移动视频通信中的纠错性能研究

The Study of Error Correction Techni ques by Using Concatenated Codes in Mobile Video Communication

无线视频移动信道是高误码率、具有突发错误的信道,信号传输的差错严重影响视频业务的传输质量。前向纠错编码是保证信号正确传输的有效方法,级连编码将两种以上的纠错编码级连,以达到在减少硬件复杂程度的前提下来增加组长,提高纠错能力。作者提出级连编码和交错技术结合的纠错编码方案,并进行计算机模拟。结果表明在市区环境下,能使误比特率由1.925×10-2降至2.614×10-5,在重要信息比特没有出现差错时,视频传输的主观效果基本满足要求。

Wireless channels for mobile video c ommunication usually have high erro r bit rate and burst errors,which will lead to a poor quality of video signal transmission.FEC(Forward Error Correction)is an efficient way to ensure the correct-ness of signal transmission.Concatenated codes concatenate two or more error correct codes in order to impro ve the abilities of error correction by reduce the compl ication of hardware and increase the group length of codes.In this paper,concatenated codes combined with interweaving wa s presented.The computer simulatio ns show that the error bit rate can be d ecreased from1.925×10 -2 to 2.614×10 -5 in urban area,and the results can satisfy human eyes if important bits have no errors.