上海交通大学学报

上海交通大学学报（自然版） ›› 2012, Vol. 46 ›› Issue (06): 910-915.

• 无线电电子学、电信技术 • 上一篇    下一篇

协作系统中联合功率分配和自适应多电平正交幅度调制算法

陈勇, 占敖, 何晨, 蒋铃鸽   

  1. (上海交通大学 信息传输与处理实验室,上海 200240)
  • 收稿日期:2011-05-25 出版日期:2012-06-28 发布日期:2012-06-28
  • 基金资助:

    国家高技术研究发展计划(863)项目(2009AA011505),国家自然科学基金资助项目(61172067),国家科技重大专项(2010ZX0300300203,2011ZX0300300103)

Joint Power Allocation and Adaptive M-QAM Algorithm in Cooperative System

 CHEN  Yong, ZHAN  Ao, HE  Chen, JIANG  Ling-Ge   

  1. (Information Transmission and Processing Lab., Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2011-05-25 Online:2012-06-28 Published:2012-06-28

摘要：  基于瑞利衰落的单源单宿多中继译码转发（Decode-and-Forward, DF）协作系统，提出了一种联合功率分配和自适应多电平正交幅度调制（M Quadrature Amplitude Modulation, M-QAM）算法.推导出了在高信噪比下系统误符号率（Symbol error ratio, SER）的紧密上界闭式表达式，并在给定系统SER的条件下，得到最小化SER的功率次优分配和实现MQAM自适应速率控制的联合算法.该联合算法仅需要在发送端获得信道统计状态信息（Channel Statistic State Information，CSSI），从而避免了系统信道瞬时状态信息交互的开销.实验仿真表明，在高信噪比下，推导的闭式表达式逼近蒙特卡罗实验结果，提出的联合算法带来了性能增益.

关键词: 协作通信, 译码前传, 功率次优分配, 自适应

Abstract: In a decode-and-forward Rayleigh fading system with relay nodes, this paper derived a tight upper bound on symbol error rate (SER) in the high signaltonoise ratio (SNR) regime, and then proposed a joint power allocation and adaptive M-QAM algorithm. The algorithm requires transmission nodes to have only the channel statistic state information (CSSI), which spends fewer overheads than power schemes with channel instantaneous state information (CISI). The simulation results show that the derived upper bound approximates the Monte Carlo results and the proposed algorithm achieves performance gain.
Key words：

Key words: coopera14tive communication, decode-and-forward(DF), suboptimum power allocation, adaptive

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