Uniquely Decodable Codes for Physical-Layer Network Coding in Wireless Cooperative Communications
Uniquely Decodable Codes for Physical-Layer Network Coding in Wireless Cooperative Communications
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DOI：
10.1109/jsyst.2019.2891785
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发表时间：
2019-02
影响因子：
4.4
通讯作者：
Qiyue Yu;Ya-Tian Li;W. Meng;W. Xiang
中科院分区：
文献类型：
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作者：
Qiyue Yu;Ya-Tian Li;W. Meng;W. Xiang
物理层网络编码（PNC）由于其具有多址接入信号的优点，近年来受到学术界和工业界的广泛关注。由于减少了时隙（TS）的数量，PNC能够显著提高吞吐量，特别是对于由2个用户终端和1个中继节点组成的典型3节点网络。然而，一个具有$M$个节点（$M>3$）且不采用附加技术的网络需要$（2 M-2）$个TS来实现所有节点之间的信息交换，因为网络编码在中继节点处无法区分用户。提出了一种用于无线协作通信中PNC的唯一可解码码。建议的UDC只需要两个TS的信息交换，而不管网络中的节点数量。本文还研究了基于UDC的PNC的放大转发和解码转发模式。本文分析了所提出的方案的误码率和吞吐量。使用模拟结果，我们证明了我们的理论结果与模拟结果吻合得很好。
Physical-layer network coding (PNC) has received much attention, both from academia and industry lately, since it takes advantages of multiple-access signals. Because of a reduced number of time slots (TSs), PNC is capable of improving throughput significantly, especially for a typical 3-node network consisting of 2 user terminals and 1 relay node. However, a network with $M$ nodes ($M>3$) and without adopting additional techniques needs $(2M-2)$ TSs to realize information exchange among all the nodes, since network coding is unable to distinguish between users at the relay node. This paper proposes uniquely decodable codes (UDCs) for PNC in wireless cooperative communications. The proposed UDC requires only two TSs for information exchange irrespective of the number of nodes in the network. This paper also investigates the amplify-and-forward and decode-and-forward modes for UDC-based PNC. The bit error rate and throughput of the proposed schemes are analyzed in this paper. Using simulation results, we demonstrate that our theoretical results align well with the simulation results.