Relay selection for peer-to-peer cooperative OFDMA with channel distribution uncertainty

Relay selection for peer-to-peer cooperative OFDMA with channel distribution uncertainty
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信道分布不确定的点对点协作 OFDMA 中继选择

DOI:
10.1007/s12083-014-0300-4
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发表时间:
2014-07
影响因子:
4.2
通讯作者:
Hua C.
Hua C.
中科院分区:
计算机科学4区
文献类型:
--
作者:
Hu B.;Chen C.;Guan X.;Hua C.

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对等中继技术为用户之间的协作通信提供了机会,实现了传输分集。研究了信道分布不确定的对等协作OFDMA系统中的中继选择和子载波分配问题。服务质量(Qos)需求以概率约束为特征。采用Kullback-Leibler(KL)散度来描述信道状态信息(CSI)的不确定性,CSI服从与参考分布偏离一定距离的分布。由于概率约束是难以处理的,我们转而求助于易于处理的上界。采用内点割平面法(IPCP)进行迭代求解,设计了黄金分割法和内点法相结合的迭代算法来寻找约束的鞍点。仿真结果表明了该算法的有效性。
Peer-to-peer relay technique provides the opportunity of cooperative communication between users to achieve the transmission diversity. In this paper, the problem of relay selection and subcarrier allocation in peer-to-peer cooperative OFDMA system with channel distribution uncertainty is studied. The quality of service (QoS) requirements are characterized with the probabilistic constraints. The Kullback-Leibler (KL) divergence is adopted to describe the uncertainty of the channel state information (CSI), which follows a distribution deviated within a certain distance from the reference distribution. Since the probabilistic constraint is intractable, we resort to a tractable upper bound instead. The problem is solved by the interior point cutting plane (IPCP) method, which proceeds in round whereby an iterative method is designed to combine both golden section method and interior point method to find the saddle point of the constraint. Simulation results show the effectiveness of our algorithm.
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期刊: --
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