计算机工程

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基于部分信道信息的中继选择与功率分配算法

惠 鏸,张 瑶,李 琦   

  1. (西安理工大学自动化与信息工程学院,西安710048)
  • 收稿日期:2013-10-06 出版日期:2014-10-15 发布日期:2014-10-13
  • 作者简介:惠 鏸(1979 - ),女,讲师,主研方向:协作通信;张 瑶,硕士研究生;李 琦,教授。
  • 基金项目:
    国家自然科学基金资助项目(61102061)。

Relay Selection and Power Allocation Algorithm Based on Partial Channel Information

HUI Hui,ZHANG Yao,LI Qi   

  1. (School of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)
  • Received:2013-10-06 Online:2014-10-15 Published:2014-10-13

摘要: 针对传统中继选择算法反馈开销大、信道条件利用不充分以及等功率分配算法资源利用率低等问题,在放大转发协作通信网络中,以最小化系统中断概率为目标,提出基于部分信道状态信息的中继选择与功率分配算法。指出源-中继-目的节点传输链路所能获得的信噪比受制于源-中继及中继-目的链路中接收信噪比较小者,各中继依据自身到源及目的节点链路的统计信道状态信息,采用不同的反馈策略向源节点进行信息反馈,由源节点完成中继选择,通过凸优化方法对所选择的源和中继节点进行功率分配。仿真结果表明,与基于第一跳信道信息的算法相比,该算法在仅增加少量反馈的条件下可明显降低系统的中断概率,且与同等反馈负荷下的其他算法相比,仍能获得较好的中断性能。

关键词: 协作通信, 放大转发, 中断概率, 信道状态信息, 中继选择, 功率分配

Abstract: A relay selection jointly with power allocation scheme is proposed to improve the outage performance of an Amplify-and-Forward(AF) cooperative network with partial Channel State Information(CSI). Firstly,it is proved that the system Signal-to-Noise Ratio(SNR) is subjected to the smaller one of the SNR between Source-Relay and Relay-Destination links. According to that,the potential relays choose different feedback schemes based on their statistical CSI to the source and the destination. Then the source node selects one best relay to forward messages based on the information feedback from relays. A corresponding power allocation scheme is also developed by the convex optimization method. Simulation results show that the proposed scheme significantly reduces the outage probability compared with the conventional schemes,and outperforms other schemes with the same feedback load in outage behavior.

Key words: cooperative communication, Amplify-and-Forward ( AF), outage probability, Channel State Information (CSI), relay selection, power allocation

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