基于极化码的分布式多信源信道联合编码

Distributed Joint Multi-source and Channel Coding Using Polar Codes

针对目前分布式信源信道联合编码(Distributed Joint Source-Channel Coding,DJSCC)资源消耗大、计算复杂度高的问题,利用多个信源之间的相关性,提出了基于系统极化码的多信源DJSCC方案,每一个分布式信源的编码使用硬件实现简单的系统极化码,在实际信道中,从第2个编码器开始只传输校验位,在译码端,译码器根据信源相关性进行联合解码。在此基础上,将打孔技术运用到校验位的传输中。实验仿真结果表明,提出的DJSCC方案在误码性能上优异,并且大幅度降低了功耗和计算复杂度。

To solve the problem of high power consumption and high computational complexity in current system of Distributed Joint Source-Channel Coding(DJSCC),a DJSCC scheme based on systematic polar code by using the correlation of multiple sources is proposed.For each distributed source code,systematic polar code is used,which can be implemented on hardware easily,and only parity bits is transmitted over its actual channel from the second encoder.And punching technology is applied in the transmission of parity bits.At the decoding end,the decoders work jointly according to the source correlation.The experimental results show that the proposed scheme is excellent in bit error performance,and the power consumption and computational complexity of the system are significantly reduced.