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首页> 外文期刊>Arabian Journal for Science and Engineering >Relay Selection for Broadcast Underlay Cognitive Radio Networks Using AF and DF Relaying
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Relay Selection for Broadcast Underlay Cognitive Radio Networks Using AF and DF Relaying

机译：使用AF和DF中继的广播基础认知无线电网络的中继选择

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摘要

A degree of cooperative diversity has been achieved with the introduction of relay nodes in wireless networks. However, such approach suffers from spectral efficiency loss. Therefore, different relay selection techniques have been proposed in the literature to mitigate this loss. In this paper, the problem of relay selection for broadcast cognitive radio networks (CRNs) is investigated. The CRN is composed of a primary transmitter and receiver, a secondary source and several destination nodes. It is assumed that the secondary source broadcasts a signal to N secondary destinations. We implicitly split the destination nodes into two sets: reliable nodes having an signal-to-noise ratio (SNR) larger than a predefined threshold (T) and unreliable nodes with SNR lower than T. The paper proposes several relay selection techniques based on the average SNR, instantaneous SNR, and best direct link. Relay selection is performed by a central node taking into account the interference level at primary receiver and channel state information between nodes of the secondary CRN. In addition, the paper provides the mathematical derivation and analysis of the bit error probability (BEP) of relay selection in broadcast CRNs for both amplify and forward and decode and forward relaying. We propose to select a single relay among reliable nodes that verify interference constraints (interference to primary receiver lower than the interference threshold ) to help the remaining unreliable nodes. The threshold T is optimized numerically to yield the lowest BEP. Our theoretical results are confirmed by simulation.
机译：通过在无线网络中引入中继节点，已经实现了一定程度的协作分集。然而，这种方法遭受频谱效率损失。因此，在文献中已经提出了不同的中继选择技术来减轻这种损失。本文研究了广播认知无线电网络（CRN）的中继选择问题。 CRN由一个主要的发送器和接收器，一个辅助源和几个目标节点组成。假定次要源向N个次要目的地广播信号。我们将目标节点隐式地分为两部分：信噪比（SNR）大于预定义阈值（T）的可靠节点和SNR低于T的不可靠节点。平均SNR，瞬时SNR和最佳直接链接。中继选择是由中央节点执行的，其中要考虑主要接收方的干扰级别和辅助CRN节点之间的信道状态信息。此外，本文还对广播CRN中的中继选择的误码概率（BEP）进行了数学推导和分析，以进行放大，转发，解码和转发中继。我们建议在可靠节点中选择一个中继来验证干扰约束（对主要接收器的干扰低于干扰阈值），以帮助其余不可靠的节点。阈值T在数值上进行了优化，以产生最低的BEP。我们的理论结果通过仿真得到了证实。

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