Network-coding-based two-way relay cooperation with energy harvesting
Network-coding-based two-way relay cooperation with energy harvesting
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DOI：
10.1177/1550147717706437
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发表时间：
2017-04
影响因子：
2.3
通讯作者：
Shun-wai Zhang;Rong-fang Song;T. Hong
中科院分区：
文献类型：
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作者：
Shun-wai Zhang;Rong-fang Song;T. Hong
对于中继协作系统或网络，在某些场景中，中继被部署在难以到达的区域，例如在偏远的山上或在海上。继电器由电网能量供电是不切实际的。如果继电器由电池供电，则更换耗尽的电池是困难的且成本高。为了克服中继节点的功率依赖性，提出了一种基于网络编码的双向中继协作能量收集方案，中继节点配备多个天线，用于信息解码和能量收集。中继端采用网络编码减少时隙，信源端采用低密度奇偶校验码提高可靠性。我们引入了一个最大比合并为基础的解码算法，该系统实现编码增益和分集增益。进一步分析了中继站采用最优天线选择算法传输数据时系统的中断概率和误比特率。理论分析和数值仿真结果表明，在相同条件下，该系统的性能优于相应的点对点系统。结果还表明，中继应部署在距离中断概率要求较低的用户较近的位置。
For the relay cooperation systems or networks, in some scenarios, the relay is deployed in the hard-to-reach areas, such as on the remote mountains or in the sea. It is impractical for the relay to be powered by grid energy. And if the relay is powered by battery, it is difficult and high cost to replace the depleted battery. To overcome the power dependence of the relay, this article proposes the network-coding-based two-way relay cooperation with energy harvesting, where the relay is equipped with multiple antennas for information decoding and energy harvesting. Network coding is adopted at the relay to reduce the time slots, and low-density parity check codes are employed at the sources to improve the reliability. We introduce a maximal ratio combining–based decoding algorithm for the proposed system to achieve coding gain and diversity gain. Furthermore, we analyze the outage probability and bit error rate of the system when the optimal antenna selection algorithm is adopted at the relay to transmit data. Theoretical analysis and numerical simulation results show that the proposed system outperforms the corresponding point-to-point system under the same condition. The result also demonstrates that the relay should be deployed closer to the user whose outage probability is required to be lower.