Max-Min Fairness and Sum-Rate Maximization of MU-VLC Local Networks
Max-Min Fairness and Sum-Rate Maximization of MU-VLC Local Networks
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DOI：
10.1109/glocomw.2015.7414133
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Thanh V. Pham;A. Pham
中科院分区：
文献类型：
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作者：
Thanh V. Pham;A. Pham
在本文中，我们研究了多用户多输入单输出（MU-MISO）可见光通信（VLC）的室内广播系统。多个LED阵列被部署为发射器，以同时为多个用户服务。在这样的广播系统中，主要的挑战性问题是用户之间的多用户干扰（MUI）的存在。为了完全消除MUI，采用了最初为射频（RF）通信设计的迫零（ZF）预编码技术，由于其计算复杂度低。然而，与RF对应物不同，VLC信号本质上是非负的，这导致修改ZF预编码矩阵的设计的必要性。本文研究了在房间规模的场景下，考虑到预编码矩阵的非负信号约束，所有用户的最大最小公平性和最大化速率和的下界。此外，数值结果表明，相对用户的位置对系统性能有相当大的影响。
In this paper, we study multi-user multiple-input single-output (MU-MISO) visible light communications (VLC)for indoor broadcast systems. Multiple LED arrays are deployed as transmitters to serve multiple users simultaneously. In such broadcast systems, the main challenging issue is the presence of multi-user interference (MUI) among users. In order to completely cancel the MUI, the zero forcing (ZF) precoding technique which is originally designed for radio frequency (RF)communications, is adopted due to its low computational complexity. However, different from RF counterpart the VLC signal is inherently non-negative leading to the necessity of modifying the design of ZF precoding matrix. The paper investigates the maxmin fairness and the lower bound for the sum-rate maximization of all users in the room scale scenario taken into account the non-negativity signal constraint imposing on precoding matrix. Furthermore, numerical results show that relative user's positions has a considerable impact on the system performance.