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arXiv 2005.07416cs.ITeess.SPmath.IT
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基于随机波束形成的智能反射面辅助MISO通信系统中断最小化

Outage Minimization for Intelligent Reflecting Surface Aided MISO Communication Systems via Stochastic Beamforming

Wenzhi Fang, Min Fu, Yuanming Shi, Yong Zhou

摘要:

智能反射面(IRS)具有通过重构无线传播环境来显著提高网络性能的潜力。然而,在IRS辅助的无线网络中,很难获得准确的下行链路信道状态信息(CSI)以用于有效的波束成形设计。在这篇文章中,我们考虑了一个IRS辅助下行链路多输入单输出(MISO)网络,其中的基站(BS)是不需要知道底层的信道分布。我们制定了中断概率最小化的问题,通过联合优化的波束成形向量在BS和在IRS的相移矩阵,同时考虑到发射功率和么模约束。所提出的问题是一个非凸非光滑随机优化问题。为此,我们采用sigmoid函数作为代理来解决目标函数的非光滑性。此外,我们提出了一个数据驱动的高效交替随机梯度下降(SGD)算法来解决这个问题,利用历史信道样本。仿真结果表明,该算法的性能增益的基准方法在最小化中断概率。

英文摘要:

Intelligent reflecting surface (IRS) has the potential to significantly enhance the network performance by reconfiguring the wireless propagation environments. It is however difficult to obtain the accurate downlink channel state information (CSI) for efficient beamforming design in IRS-aided wireless networks. In this article, we consider an IRS-aided downlink multiple-input single-output (MISO) network, where the base station (BS) is not required to know the underlying channel distribution. We formulate an outage probability minimization problem by jointly optimizing the beamforming vector at the BS and the phase-shift matrix at the IRS, while taking into account the transmit power and unimodular constraints. The formulated problem turns out to be a non-convex non-smooth stochastic optimization problem. To this end, we employ the sigmoid function as the surrogate to tackle the non-smoothness of the objective function. In addition, we propose a data-driven efficient alternating stochastic gradient descent (SGD) algorithm to solve the problem by utilizing the historical channel samples. Simulation results demonstrate the performance gains of the proposed algorithm over the benchmark methods in terms of minimizing the outage probability.

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