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arXiv 1508.01892cs.ITmath.IT
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一种无线协同通信的自适应传输协议

An Adaptive Transmission Protocol for Wireless-Powered Cooperative Communications

Yifan Gu, He Chen, Yonghui Li, Branka Vucetic

摘要:

在本文中,我们考虑了一个无线供电的协作通信网络,其中包括一个混合接入点(AP),一个源和一个中继,以协助信息传输。与传统的合作网络,源和中继被假定为没有嵌入式能源供应所考虑的系统。因此,在上行链路(UL)中的信息传输之前,它们需要首先从AP在下行链路(DL)中辐射的射频(RF)信号中收获能量。受最近提出的先收获后传输(HTT)和先收获后合作(HTC)协议的启发,我们提出了一种新的自适应传输(AT)协议。在所提出的协议中,在每个传输块的开始,AP向源收费。AP和源然后执行信道估计以获取它们之间的信道状态信息(CSI)。基于CSI估计,AP自适应地选择源以直接或与中继协作地执行UL信息传输。我们推导出一个近似的封闭形式的平均吞吐量的建议在Nakagami-m衰落信道的AT协议的表达式。然后通过Monte Carlo模拟验证了分析。实验结果表明,该协议的性能明显优于HTT和HTC协议。

英文摘要:

In this paper, we consider a wireless-powered cooperative communication network, which consists of one hybrid access point (AP), one source and one relay to assist information transmission. Unlike conventional cooperative networks, the source and relay are assumed to have no embedded energy supplies in the considered system. Hence, they need to first harvest energy from the radio-frequency (RF) signals radiated by the AP in the downlink (DL) before information transmission in the uplink (UL). Inspired by the recently proposed harvest-then-transmit (HTT) and harvest-then-cooperate (HTC) protocols, we develop a new adaptive transmission (AT) protocol. In the proposed protocol, at the beginning of each transmission block, the AP charges the source. AP and source then perform channel estimation to acquire the channel state information (CSI) between them. Based on the CSI estimate, the AP adaptively chooses the source to perform UL information transmission either directly or cooperatively with the relay. We derive an approximate closed-form expression for the average throughput of the proposed AT protocol over Nakagami-m fading channels. The analysis is then verified by Monte Carlo simulations. Results show that the proposed AT protocol considerably outperforms both the HTT and HTC protocols.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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