Robust Beamforming With Partial Channel State Information for Energy Efficient Networks

Robust Beamforming With Partial Channel State Information for Energy Efficient Networks
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具有部分信道状态信息的鲁棒波束成形,用于节能网络

DOI:
10.1109/jsac.2015.2478720
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发表时间:
2015-09
影响因子:
16.4
通讯作者:
You Xiaohu
You Xiaohu
中科院分区:
计算机科学1区
文献类型:
--
作者:
Xu Wei;Cui Yuke;Zhang Hua;Li Geoffrey Ye;You Xiaohu

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在本文中,我们研究了鲁棒波束形成,以提高无线网络的能量效率(EE)时,只有不完美的或部分的信道状态信息(CSI)是在发射机。由于CSI量化误差和/或有限的反馈信息,CSI缺陷可以通过有界不确定性区域来很好地建模。我们专注于最坏情况下的鲁棒波束形成策略,以优化确定性有界信道模型下的下行链路传输的EE,它只假设一个最大的信道误差幅度。我们从一个单用户单小区MIMO系统,并获得一个封闭的形式设计鲁棒波束形成。对于多小区网络,鲁棒波束形成是非凸分数形式的,并且解决方案不能直接从单小区场景扩展。为了有效地解决这个问题,我们求助于一个下界,而不是原始问题,并将其转换为半定规划(SDP)。计算机仿真结果证实了所提出的波束形成设计的鲁棒性和效率。
In this paper, we investigate robust beamforming to improve the energy efficiency (EE) of wireless networks when only imperfect or partial channel state information (CSI) is available at the transmitter. Due to CSI quantization errors and/or limited feedback information, CSI imperfections can be well modeled by a bounded uncertainty region. We focus on the worst case robust beamforming strategy to optimize the EE of downlink transmission under the deterministic bounded channel model, which merely assumes a maximal channel error magnitude. We start with a single-user single-cell MIMO system and obtain a closed-form design for robust beamforming. For a multicell network, robust beamforming is in a nonconvex fractional form, and the solution cannot be directly extended from the single-cell scenario. To solve this problem efficiently, we resort to a lower bound, instead of the primal problem, and cast it as a semidefinite program (SDP). The robustness and efficiency of the proposed beamforming design are confirmed by computer simulation results.
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