基于SWIPT的乘积Polar编码协作构造与分析

Construction and Performance Analysis of SWIPT-Based Product Polar Coded Cooperation

为实现绿色可靠通信,提出了基于无线信息与能量同传(SWIPT)技术的乘积极化(Polar)编码协作系统。首先,建立基于SWIPT的乘积Polar编码协作系统模型;其次,将Polar码作为乘积码的分量码构建乘积Polar码,分别在信源节点和中继节点对其行编码和列编码;最后,在目的节点提出一种低译码时延的两步译码算法,第一步对接收到乘积Polar码的码字矩阵分别进行串行相消(SC)译码与列SC译码,若第一步译码失败,则执行第二步译码,即将乘积Polar码的码字矩阵变换为单行Polar码,再SC译码。理论分析与仿真表明,相比点对点系统,基于SWIPT的乘积Polar编码协作大大降低了译码时延;与采用置信度传播译码算法的乘积低密度奇偶校验编码协作系统相比,所提系统误码性能更优。

In order to achieve green reliable communication,a product polar coded cooperation system based on simultaneous wireless information and power transfer(SWIPT)is proposed.Firstly,the product polar coded cooperation model based on SWIPT is established.Secondly,the polar code is used as the component code of the product code to construct the product polar code,which is row coded at the source node and column coded at the relay node.Finally,a two-step decoding algorithm with low decoding delay is proposed at the destination node.In the first step,row successive cancellation(SC)decoding and column SC decoding are performed on the codeword matrix of the received product polar code.If the first step decoding fails,the second step decoding is performed,in which the codeword matrix of the product polar code is transformed into a single line polar code,and then decoded by SC.Theoretical analysis and simulation show that compared with point-to-point system,the product polar coded cooperation based on SWIPT greatly reduces the decoding delay.Compared with the product low density parity check coded cooperative system that uses the belief propagation decoding algorithm,the proposed system has better bit error performance.