非均匀纠错Turbo码在图像无线传输中的应用  

Turbo Codes with Unequal Error Protection method for Transmission of Images over Wireless channels

作　　者：肖东亮[1] 孙洪[1] 江森[1] 苏祥芳[1] 保宗悌 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]华南师范大学电信工程系,广东广州510631

出　　处：《电路与系统学报》2002年第1期83-86,共4页Journal of Circuits and Systems

基　　金：国家自然科学基金(60072041) 资助项目

摘　　要：本文根据信源编码码流中信息比特重要性不均匀特点,采用变码率信道编码、分集发送、分集接收、非均匀迭代译码策略,对传统的Turbo码编译码器结构做了改进,给出了实验结果。通过比较发现,改进算法降低了时延,提高了Turbo码译码算法的纠错性能,特别适合于多媒体非实时无线传输业务 。We show that how Turbo codes can be endowed with unequal error protection(UEP).UEP is achieved by:1) suitably positioning the different importance classes of information symbols in the encoded information;2) puncturing the redundancy symbols with a non-uniform pattern;3) suitably choosing the number of decoding iteration which were matched to the different sensitivity of source encoded symbols;4) a scheme using convolution Turbo codes with four transmitters and four receivers has been proposed according to the different important classes. UEP is a promising choice due to its good performance and small delays.

关 键 词：TURBO码 非均匀纠错技术 算术编码 图像无线传输 

分 类 号：TN911.23[电子电信—通信与信息系统] TN919.81[电子电信—信息与通信工程]