Abstract

To achieve a high reliable and energy-saving green communication, we investigate a multisource simultaneous wireless information and power transfer (SWIPT)-based coded cooperation where the relay can realize information decoding and energy harvesting. Firstly, a class of naturally rate compatible low-density parity-check (LDPC) codes–quasi-cyclic repeat-accumulate (QC-RA) codes is introduced, and the joint parity-check matrix corresponding to the QC-RA codes employed by the multiple sources and relay is deduced. Based on the joint parity-check matrix, we jointly design the QC-RA codes to cancel all the short girth cycles. Then, by exploiting the rate compatible characteristic of QC-RA codes, we propose a new SWIPT protocol—codeword splitting protocol for the proposed system, which has the characteristics of lower complexity, higher efficiency, no strictly bit synchronization limitation, and less hardware requirement. The results show that the bit error rate (BER) performance of the proposed system employing jointly designed QC-RA codes clearly outperforms that of general RA codes. Theoretical analysis and numerical simulations also demonstrate the superiority of the proposed codeword splitting protocol.

中文翻译：

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基于多源SWIPT的编码协作：速率兼容的代码和代码字拆分协议

摘要

为了实现高度可靠和节能的绿色通信，我们研究了一种基于多源同时无线信息和功率传输（SWIPT）的编码合作，其中中继可以实现信息解码和能量收集。首先，介绍了一类自然速率兼容的低密度奇偶校验（LDPC）码-准循环重复累积（QC-RA）码，并采用了与QC-RA码相对应的联合奇偶校验矩阵推导出多个源和中继。基于联合奇偶校验矩阵，我们共同设计了QC-RA码以消除所有短周长周期。然后，通过利用QC-RA码的速率兼容特性，针对该系统提出了一种新的SWIPT协议—码字拆分协议，具有较低的复杂度，较高的效率，没有严格的位同步限制，并且对硬件的需求更少。结果表明，采用联合设计的QC-RA码的提议系统的误码率（BER）性能明显优于一般RA码。理论分析和数值模拟也证明了所提出的码字分裂协议的优越性。