Coordination/Cooperation Strategies and Optimal Zero-Forcing Precoding Design for Multi-User Multi-Cell VLC Networks
Coordination/Cooperation Strategies and Optimal Zero-Forcing Precoding Design for Multi-User Multi-Cell VLC Networks
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DOI：
10.1109/tcomm.2019.2900675
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发表时间：
2019-06-01
影响因子：
8.3
通讯作者：
Pham, Anh T.
中科院分区：
文献类型：
--
作者：
Pham, Thanh V.;Pham, Anh T.
研究了多用户多小区可见光通信网络，其中每个小区由多个发光二极管（LED）阵列组成。多个LED发射器的使用使得每个小区能够借助于预编码技术来支持多个用户。在这样的多用户多小区网络中，每个用户的信号不仅会受到同一小区中其他用户的信号的严重干扰，即，小区内干扰，而且还受到其它小区的用户的信号的影响，即，小区间干扰。虽然小区内干扰可以通过底层预编码方案来处理，但是很难处理小区间干扰。本文重点研究了小区协调/协作策略及其相应的协调/协作预编码器设计，作为减轻或可能消除小区间干扰的方法。我们首先推导出高斯干扰信道的容量的上下限，输入和干扰的幅度限制。利用推导出的边界和迫零方案作为基本的预编码技术，最佳的协调/合作的预编码设计，以最大限度地提高用户的和速率下的非负性和幅度限制的信道输入的约束。全面的数值结果比较所考虑的协调/合作策略的性能。
This paper studies multi-user multi-cell visible light communications networks in which each cell is composed of multiple light emitting diode (LED) arrays. The use of multiple LED transmitters enables each cell to support multiple users by means of precoding techniques. In such multi-user multi-cell networks, the signal for each user can be severely interfered not only by the signals that are intended to other users in the same cell, i.e., intra-cell interference, but also by the signals for users of the other cells, i.e., inter-cell interference. While intra-cell interference can be handled by the underlying precoding scheme, it is hard to deal with the inter-cell one. This paper focuses on cell coordination/cooperation strategies and their corresponding coordinated/cooperative precoder designs as the approaches to alleviate, or possibly, to cancel out the inter-cell interference. We first derive lower and upper bounds on the capacity of Gaussian interference channels with amplitude constraints on the input and the interference. Capitalizing on derived bounds and the zero-forcing scheme as the underlying precoding technique, optimal coordinated/cooperative precoding designs to maximize users' sum-rate are investigated under the non-negativity and amplitude-limited constraints on the channel inputs. The comprehensive numerical results are presented to compare the performance of the considered coordination/cooperation strategies.