A Joint Transmit and Receive Design for Dimmable High Speed MC MU VLC Systems
A Joint Transmit and Receive Design for Dimmable High Speed MC MU VLC Systems
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DOI：
10.1109/globecom48099.2022.10000856
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Yujie Yang;Yang Yang-Yang;Hailun Xia;Caili Guo;Mahdi Chehimi;W. Saad
中科院分区：
文献类型：
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作者：
Yujie Yang;Yang Yang-Yang;Hailun Xia;Caili Guo;Mahdi Chehimi;W. Saad
在多小区多用户多输入多输出（MC MU-MIMO）可见光通信（VLC）系统中，每个用户配备有具有相似信道增益的多个紧密放置的光电二极管（PD），导致严重的小区间干扰和小区内干扰。为了解决这个问题，本文提出了一种具有MIMO VLC收发器设计的混合调光（HD）方案，该方案联合优化了MC MU-MIMO VLC系统的发射和接收天线选择（TRAS）、小区集群和预编码（TRASP-HD）。在该方案中，在调光水平和照明均匀性下的和速率最大化问题被公式化，并通过分成两个子问题来求解。特别地，第一个子问题是在照明均匀性约束下基于和速率最大化准则的TRAS和单元形成。基于相同的目标，第二子问题是优化每个小区的预编码矩阵。最后，这两个子问题迭代求解，以获得收敛的解决方案。仿真结果表明，在典型的室内场景下，TRASP-HD方案的平均带宽效率比传统的MC MU-MIMO系统高2.36 bit/s/Hz。
In multi-cell multi-user multiple-input multiple-output (MC MU-MIMO) visible light communication (VLC) systems, each user is equipped with multiple closely-placed photodiodes (PDs) with similar channel gains, leading to severe inter-cell interference and intra-cell interference. To address this problem, this paper proposes a hybrid dimming (HD) scheme with MIMO VLC transceiver design, which jointly optimizes transmit and receive antenna selection (TRAS), cell clustering and precoding (TRASP-HD) for MC MU-MIMO VLC systems. In this scheme, a sum-rate maximization problem under the dimming level and illumination uniformity is formulated and solved by being divided into two sub-problems. In particular, The first sub-problem is on TRAS and cell formation based on the criterion of sum-rate maximization under the illumination uniformity constraint. With the same goal, the second sub-problem is on optimizing the precoding matrices of each cell. Finally, these two sub-problems are iteratively solved to obtain a convergent solution. Simulation results verify that in a typical indoor scenario, the mean bandwidth efficiency of TRASP-HD scheme is 2.36 bit/s/Hz higher than the conventional MC MU-MIMO system.