Outage probability guaranteed relay selection in cooperative communications

Outage probability guaranteed relay selection in cooperative communications
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协作通信中保证中断概率的中继选择

DOI:
10.1049/iet-com.2013.0655
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发表时间:
2014-04
期刊:
影响因子:
1.6
通讯作者:
X. Guan
X. Guan
中科院分区:
计算机科学4区
文献类型:
--
作者:
H. Li;C. Hua;C. Chen;X. Guan

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本文主要研究协作通信中的多中继选择问题。目标是选择最小的中继组以最小化频谱成本,同时保持目的地的信噪比(SNR)要求。采用概率约束来描述信噪比中断要求,结果证明该要求通常是难以处理的。作为解,给出了中断概率约束的一个易于处理的界,在这个界下,多个继电器选择问题可以表示为一个具有继电器开关功率模式的混合整数优化问题,这是NP-难的。通过利用所提出的不同中继器边界的交集,作者提出了一种中断概率保证的中继器选择算法,该算法能够在显著降低复杂度的情况下找到最优解。为了进行比较,还提出了一种启发式算法。大量的仿真结果表明了所提方案的有效性。
This study is focused on the multiple relay selection problem in cooperative communications. The objective is to select the minimum set of relays to minimise the spectrum cost while preserving the signal-to-noise ratio (SNR) requirement at the destination. A probabilistic constraint is adopted to characterise the SNR outage requirement, which turns out to be intractable in general. As a solution, a tractable bound is derived for the outage probability constraint, with which the multiple relay selection problem can be formulated as a mixed integer optimisation problem with the on-and-off power mode at the relays, which is NP-hard. By utilising the intersections of the proposed bound for different relays, the authors propose an outage probability guaranteed relay selection algorithm which can find the optimal solution with significantly reduced complexity. A heuristic algorithm is also proposed for comparison. Extensive simulation results are provided to show the effectiveness of the proposed schemes.
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