Optimization of Cooperative Beamforming for SC-FDMA Multi-User Multi-Relay Networks by Tractable D.C. Programming
Optimization of Cooperative Beamforming for SC-FDMA Multi-User Multi-Relay Networks by Tractable D.C. Programming
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DOI：
10.1109/tsp.2012.2222388
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发表时间：
2013
影响因子：
5.4
通讯作者：
H. H. Kha-H.;H. Tuan;Ha H. Nguyen;Tung T. Pham
中科院分区：
文献类型：
--
作者：
H. H. Kha-H.;H. Tuan;Ha H. Nguyen;Tung T. Pham
研究了终端采用单载波频分多址(SC-FDMA)技术的多用户多中继无线网络的最优协作波束形成设计。所感兴趣的问题是找到跨中继的波束赋形权重，以最大化在每个中继处受个人功率限制的源用户的最小信干噪比(SINR)。这种波束赋形设计被证明是一个困难的非凸优化问题，因此寻找最优解在数学上是具有挑战性的。通过研究它的局部凸结构，我们将设计问题转化为DC的极小化问题。(两凸之差)目标函数受凸约束，并开发了一种低复杂度的有效迭代算法来求解它。仿真结果表明，我们的最优协作波束形成方案实现了中继网络固有的分集顺序，其性能明显优于等功率波束形成权值。
This paper addresses the optimal cooperative beamforming design for multi-user multi-relay wireless networks in which the single-carrier frequency division multiple access (SC-FDMA) technique is employed at the terminals. The problem of interest is to find the beamforming weights across relays to maximize the minimum signal-to-interference-plus-noise ratio (SINR) among source users subject to individual power constraints at each relay. Such a beamforming design is shown to be a hard nonconvex optimization problem and therefore it is mathematically challenging to find the optimal solution. By exploring its partial convex structures, we recast the design problem as minimization of a d.c. (difference of two convex) objective function subject to convex constraints and develop an effective iterative algorithm of low complexity to solve it. Simulation results show that our optimal cooperative beamforming scheme realizes the inherent diversity order of the relay network and it performs significantly better than the equal-power beamforming weights.