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arXiv 2106.04750cs.ITmath.IT
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基于SWIPT的超密集C-RAN中无线前传和接入链路的协作波束成形:一阶方法

Cooperative Beamforming for Wireless Fronthaul and Access Links in Ultra-Dense C-RANs with SWIPT: A First-Order Approach

Fangqing Tan, Peiran Wu, Yik-Chung Wu, Minghua Xia

摘要:

本文研究了云无线接入网(C-RAN)中的多组多播传输,其中密集的远程射频头(RRH)分别为信息用户(IU)和能量用户(EU)提供信息和能量服务。为了最大化信息服务的加权和速率(WSR),同时满足能量收集水平在EU,联合波束成形设计的优化制定的前传和接入链路,然而,这是既不光滑也不凸,确实是NP-难。针对这一问题,利用光滑和逐次凸逼近将原问题转化为一系列凸问题,并分别给出了求解初始可行点和近最优解的两个一阶算法.此外,加速算法的设计,以提高收敛速度,利用Nesterov和重球动量。数值结果表明,所提出的一阶算法与传统的二阶算法相比,在获得几乎相同的WSR的同时,具有更低的计算复杂性,并且在WSR方面优于现有的竞争方案.

英文摘要:

This work studies multigroup multicasting transmission in cloud radio access networks (C-RANs) with simultaneous wireless information and power transfer, where densely packed remote radio heads (RRHs) cooperatively provide information and energy services for information users (IUs) and energy users (EUs), respectively. To maximize the weighted sum rate (WSR) of information services while satisfying the energy harvesting levels at EUs, an optimization of joint beamforming design for the fronthaul and access links is formulated, which is however neither smooth nor convex and is indeed NP-hard. To tackle this difficulty, the smooth and successive convex approximations are used to transform the original problem into a sequence of convex problems, and two first-order algorithms are developed to find the initial feasible point and the nearly optimal solution, respectively. Moreover, an accelerated algorithm is designed to improve the convergence speed by exploiting both Nesterov and heavy-ball momentums. Numerical results demonstrate that the proposed first-order algorithms achieve almost the same WSR as that of traditional second-order approaches yet with much lower computational complexity, and the proposed scheme outperforms state-of-the-art competing schemes in terms of WSR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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