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arXiv 2409.01263eess.SP
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多小区网络中协调半双工/全双工协作速率分割多址接入

Coordinated Half-Duplex/Full-Duplex Cooperative Rate-Splitting Multiple Access in Multi-Cell Networks

Mohamed Elhattab, Shreya Khisa, Chadi Assi, Ali Ghrayeb, Marwa Qaraqe, Georges Kaddoum

AI总结:

本文提出多小区网络中基于JT-CoMP的HD/FD协作速率分割多址接入方案,联合优化波束成形、速率分配、中继功率和时隙比例,仿真显示其性能显著优于C-NOMA、NOMA和RSMA基线。

摘要:

本文研究了在联合传输协调多点(JT-CoMP)辅助下的多小区无线网络中的下行链路协作速率分割多址接入(C-RSMA)。在该网络中,每个小区由一个配备多根天线的基站(BS)、一个或多个小区中心用户(CCU)以及位于小区边缘的多个小区边缘用户(CEU)组成。通过JT-CoMP,所有基站协作同时向包括CCU和CEU在内的所有用户传输数据。为了增强CEU的信号质量,CCU以半双工(HD)或全双工(FD)解码转发(DF)中继模式将公共流中继给CEU。在此设置中,我们旨在联合优化基站处的波束成形向量、公共流速率分配、中继用户(即CCU)的发射功率以及时隙比例,以最大化最小可实现数据速率。然而,所构建的优化问题是非凸的,直接求解具有挑战性。为应对这一挑战,我们采用变量替换、一阶泰勒近似以及基于逐次凸逼近(SCA)的低复杂度算法。我们通过仿真结果证明了所提方案在平均可实现数据速率方面的有效性,并将其性能与四种基线方案进行了比较,包括HD/FD协作非正交多址接入(C-NOMA)、NOMA以及无用户协作的RSMA。结果表明,当基站发射功率为20 dBm时,所提出的FD C-RSMA相比FD C-NOMA可实现25%的性能提升,所提出的HD C-RSMA相比HD C-NOMA可实现19%的性能提升。

英文摘要:

This paper explores downlink Cooperative Rate-Splitting Multiple Access (C-RSMA) in a multi-cell wireless network with the assistance of Joint-Transmission Coordinated Multipoint (JT-CoMP). In this network, each cell consists of a base station (BS) equipped with multiple antennas, one or more cell-center users (CCU), and multiple cell-edge users (CEU) located at the edge of the cells. Through JT-CoMP, all the BSs collaborate to simultaneously transmit the data to all the users including the CCUs and CEUs. To enhance the signal quality for the CEUs, CCUs relay the common stream to the CEUs by operating in either half-duplex (HD) or full-duplex (FD) decode-and-forward (DF) relaying mode. In this setup, we aim to jointly optimize the beamforming vectors at the BS, the allocation of common stream rates, the transmit power at relaying users, i.e., CCUs, and the time slot fraction, aiming to maximize the minimum achievable data rate. However, the formulated optimization problem is non-convex and is challenging to solve directly. To address this challenge, we employ change-of-variables, first-order Taylor approximations, and a low-complexity algorithm based on Successive Convex Approximation (SCA). We demonstrate through simulation results the efficacy of the proposed scheme, in terms of average achievable data rate, and we compare its performance to that of four baseline schemes, including HD/FD cooperative non-orthogonal multiple access (C-NOMA), NOMA, and RSMA without user cooperation. The results show that the proposed FD C-RSMA can achieve 25% over FD C-NOMA and the proposed HD C-RSMA can achieve 19% over HD C-NOMA respectively, when the BS transmit power is 20 dBm.

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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