双向中继网络中的功率控制和中继选择技术研究

发布时间：2018-05-10 23:27

本文选题：协作通信 + 双向中继信道　；参考：《南京邮电大学》2017年硕士论文

【摘要】：作为一种新型无线传输技术,多跳和协作通信技术能有效减轻衰落信道的影响,还为节点之间质量差的链路提供通信。下一代网络应用的超大流量场景下,中继节点处的物理缓存参数将影响无线中继的吞吐量、业务安全性等等性能。在回顾无线通信新技术和无线中继技术之后,本文主要对缓存受限的中继系统的功率控制方案和中继选择方案进行研究。针对无线网络中两跳的双向信息交换,本文研究了有限缓存和无限缓存两种配置下双向译码中继的功率控制方案。数值结果显示:瑞利衰落信道下最大缓存大小设置为一个适当值时,中继缓存的大小将不会影响平均端到端容量。与等功率控制方案相比,优化功率控制将显著提高传输策略的平均端到端容量。其次,为了获取高频谱效率的、支持双向业务的半双工中继策略,本文研究一种在中继节点发射端具有信道幅度信息时的功率控制方案。与双向单中继传输策略比较,基于译码转发的双向多中继具有显著的端到端容量性能增益,在整个信噪比区域具有节省传输时隙和节省能量消耗的优点。最后,在低信噪比区域时,缓存大小较低的多中继选择方案的端到端容量性能增益优于缓存大小较高的一个中继系统方案的端到端容量性能增益,而在高信噪比区域时,缓存大小较高的一个中继系统方案的端到端容量性能增益则更好。
[Abstract]:As a new wireless transmission technology, multi-hop and cooperative communication technology can effectively reduce the impact of fading channels, and also provide communication for links with poor quality between nodes. In the scenario of large traffic in next generation network applications, the physical cache parameters at the relay node will affect the throughput, service security and other performance of wireless relay. After reviewing the new wireless communication technology and the wireless relay technology, this paper mainly studies the power control scheme and relay selection scheme of the buffer limited relay system. For the two-hop two-way information exchange in wireless networks, this paper studies the power control scheme of bi-directional decoding relay in two configurations: limited buffer and infinite buffer. Numerical results show that when the maximum buffer size is set to an appropriate value in Rayleigh fading channels the relay cache size will not affect the average end-to-end capacity. Compared with the equal-power control scheme, the average end-to-end capacity of the transmission strategy will be significantly improved by optimizing the power control. Secondly, in order to obtain a high spectral efficiency half-duplex relay strategy that supports two-way traffic, this paper studies a power control scheme with channel amplitude information at the transmitter of the relay node. Compared with the bi-directional single-relay transmission strategy, the bi-directional multi-relay based on decoding and forwarding has significant end-to-end capacity gain, and has the advantages of saving transmission time slots and energy consumption in the whole signal-to-noise ratio region. Finally, in the low SNR region, the end-to-end capacity performance gain of the multi-relay selection scheme with low buffer size is better than that of a high-buffer relay system scheme, while in the high SNR region, the end-to-end capacity performance gain is better than that in the high SNR region. The end-to-end capacity gain of a relay system with high cache size is better.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92

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