The fundamental challenge of the millimeter-wave (mmWave) frequency band is the sensitivity of the radio channel to blockages, which gives rise to unstable connectivity and impacts the reliability of a system. To this end, multi-point connectivity is a promising approach for ensuring the desired rate and reliability requirements. A robust beamformer design is proposed to improve the communication reliability by exploiting the spatial macro-diversity and a pessimistic estimate of rates over potential link blockage combinations. Specifically, we provide a blockage-aware algorithm for the weighted sum-rate maximization (WSRM) problem with parallel beamformer processing across distributed remote radio units (RRUs). Combinations of non-convex and coupled constraints are handled via successive convex approximation (SCA) framework, which admits a closed-form solution for each SCA step, by solving a system of Karush-Kuhn-Tucker (KKT) optimality conditions. Unlike the conventional coordinated multi-point (CoMP) schemes, the proposed blockage-aware beamformer design has, per-iteration, computational complexity in the order of RRU antennas instead of system-wide joint transmit antennas. This leads to a practical and computationally efficient implementation that is scalable to any arbitrary multi-point configuration. In the presence of random blockages, the proposed schemes are shown to significantly outperform baseline scenarios and result in reliable mmWave communication.

中文翻译：

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通过协调的多点连接实现阻塞感知的可靠毫米波接入

毫米波 (mmWave) 频段的基本挑战是无线电信道对阻塞的敏感性，这会导致连接不稳定并影响系统的可靠性。为此，多点连接是确保所需速率和可靠性要求的一种很有前途的方法。提出了一种稳健的波束形成器设计，通过利用空间宏分集和对潜在链路阻塞组合的速率的悲观估计来提高通信可靠性。具体来说，我们为加权和速率最大化 (WSRM) 问题提供了一种阻塞感知算法，该算法具有跨分布式远程无线电单元 (RRU) 的并行波束形成器处理。非凸和耦合约束的组合通过逐次凸逼近 (SCA) 框架处理，通过求解 Karush-Kuhn-Tucker (KKT) 最优条件系统，它为每个 SCA 步骤提供了一个封闭形式的解决方案。与传统的多点协作 (CoMP) 方案不同，所提出的阻塞感知波束成形器设计在每次迭代时具有 RRU 天线顺序的计算复杂度，而不是系统范围的联合发射天线。这导致了一种实用且计算效率高的实现，可扩展到任何任意多点配置。在存在随机阻塞的情况下，所提出的方案显示出显着优于基线场景并导致可靠的毫米波通信。所提出的阻塞感知波束成形器设计在每次迭代中具有 RRU 天线顺序的计算复杂性，而不是系统范围的联合发射天线。这导致了一种实用且计算效率高的实现，可扩展到任何任意多点配置。在存在随机阻塞的情况下，所提出的方案显示出显着优于基线场景并导致可靠的毫米波通信。所提出的阻塞感知波束成形器设计在每次迭代中具有 RRU 天线顺序的计算复杂性，而不是系统范围的联合发射天线。这导致了一种实用且计算效率高的实现，可扩展到任何任意多点配置。在存在随机阻塞的情况下，所提出的方案显示出显着优于基线场景并导致可靠的毫米波通信。