基于联合信源信道编码的无线图像传输策略设计  

Design of wireless image transmission strategy based on joint source channel coding

作　　者：胡本钧[1] 刘春光[1] HU Ben-jun;LIU Chun-guang(91550 Unit,PLA,Dalian 116023,Liaoning Province,China)

机构地区：[1]91550部队,辽宁大连116023

出　　处：《信息技术》2023年第2期7-11,共5页Information Technology

基　　金：中国博士后科研基金特别资助项目(2020T130772)。

摘　　要：针对图像数据在无线信道传输中存在的可靠性与稳定性较差等问题,提出了一种自适应不等差错保护的联合信源信道编码方案。采用基于小波变换的信源编码对原始图像数据进行压缩处理,并对生成的码流进行重要程度划分;基于LDPC码对划分好的码流数据采取不同等级的差错保护措施;最终,反馈信道状况信息给信道编码器并进行码率的自适应调整,从而实现高质量的图像信号传输。仿真实验结果表明,提出的算法具有更高的峰值信噪比(PSNR),相比EEP算法及DE-UEP算法,其PSNR值有0.2~0.4 dB的提升。Based on the problem of poor reliability and stability of image data in wireless channel transmission,this paper proposes a joint source channel coding scheme with adaptive unequal error protection.Firstly,the source coding based on wavelet transform is used to compress the original image data,and the importance of the generated code stream is divided.Secondly,based on LDPC code,different levels of error protection measures are adopted for the divided code stream data.Finally,the channel condition information is fed back to the channel encoder to adjust the bit rate adaptively,so as to achieve high-quality image signal transmission.The simulation results show that the proposed algorithm has higher peak signal-to-noise ratio(PSNR)than the previous algorithm EEP and DE-UEP,and its PSNR value is improved by 0.2 to 0.4 dB.

关 键 词：无线信道 不等差错保护 小波变换 LDPC码 峰值信噪比 

分 类 号：TN911[电子电信—通信与信息系统] TP391[电子电信—信息与通信工程]