一种协作网络编码方案的功率优化分配方法

季彦呈; 葛建华; 李靖

doi:10.3724/SP.J.1146.2009.01429

一种协作网络编码方案的功率优化分配方法

doi: 10.3724/SP.J.1146.2009.01429

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出版历程
- 收稿日期: 2009-11-06
- 修回日期: 2010-03-18
- 刊出日期: 2010-11-19

Optimal Power Allocation for a Cooperative Network Coding Scheme

摘要

摘要: 该文针对传统双路无线中继系统中的源和中继采用等功率发送，导致系统资源利用率低的问题，提出一种译码转发-空时协作网络编码方案的功率优化分配方法。该方法以最小化两源用户中断概率中的较大者为目标，并利用中断概率的高阶近似解，通过迭代计算获得最优功率分配因子。所提功率优化分配方法计算复杂度低且仅需信道的平均增益信息。仿真结果表明，与平均功率分配方法相比，所提功率优化分配方法使系统的中断概率和误码率性能均得到有效提升。
- 中继通信 /
- 网络编码 /
- 空时分组码 /
- 协作分集 /
- 中断概率
Abstract: To improve the resource utilization of traditional two-way wireless relay system which employs Equal Power Allocation (EPA) between the source and relays, an Optimal Power Allocation (OPA) algorithm for a cooperative network coding scheme is proposed. By minimizing the larger outage probability of the two sources and using the high order approximation of outage expression, the optimal power factors are obtained through iterative computation. The proposed algorithm has low implementation complexity and only needs the average channel gain information. Simulation results show that compared to the EPA algorithm, the proposed OPA algorithm is superior in terms of both outage and Symbol Error Rate (SER) performance.
- Relay communication /
- Network coding /
- Space-time block coding /
- Cooperative diversity /
- Outage probability

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