动态频谱访问中的最小最大公平功率与数据率联合控制算法

顾洪宇; 杨晨阳

doi:10.3724/SP.J.1146.2008.01127

动态频谱访问中的最小最大公平功率与数据率联合控制算法

doi: 10.3724/SP.J.1146.2008.01127

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出版历程
- 收稿日期: 2008-09-09
- 修回日期: 2009-03-25
- 刊出日期: 2009-08-19

Min-Max Fair Power and Rate Control Algorithm for Dynamic Spectrum Access

摘要

摘要: 该文研究动态频谱访问中次用户通过功率控制共享主用户频谱资源的问题。将最小最大公平功率与数据率联合控制问题建模为准凹优化问题，提出了基于迭代求解线性规划问题的功率控制算法。此外，还提出了通过次用户间相互协作估计次用户到主用户以及次用户间链路增益的方法，分析了链路增益估计误差的统计特性，提出了利用保护裕量降低链路增益估计误差对主用户和次用户服务质量影响的方法。仿真结果表明：所提出算法的性能与现有算法相同，但计算时间仅为现有算法的10%~50%，甚至更低；1 dB的干扰裕量和1.5 dB的信干噪比裕量足以保证主用户和次用户服务质量免受链路增益估计误差的影响。
- 无线通信;动态频谱访问;功率控制;最小最大公平
Abstract: In this paper, the power control problem is studied for secondary users to share primary users spectrum. The joint power and rate control under minimal-maximal fair criterion is formulated as a quasi-concave optimization, and an algorithm is proposed to obtain the optimal solution by iteratively solving linear programmings. Moreover, an approach is presented to estimate the link gains used in power control, the statistics of estimation error is analyzed, and the safeguard margins are used to alleviate the impact of the estimation error on the quality of service (QoS) of primary users and secondary users. Simulation results show that the proposed algorithm reduces the computation time by 50%~90% or more without performance loss, and that 1 dB interference margin and 1.5 dB signal-to-interference and noise margin are enough to guarantee the QoS of both primary and secondary users in the presence of the link gain estimation error, respectively.

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