Coordinated beamforming for heterogeneous small-cell networks with a non-ideal backhaul
Coordinated beamforming for heterogeneous small-cell networks with a non-ideal backhaul
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具有非理想回程的异构小蜂窝网络的协调波束成形
DOI：
10.1049/iet-com.2016.1451
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发表时间：
2017-12
影响因子：
1.6
通讯作者：
Fan Lisheng
中科院分区：
文献类型：
--
作者：
Zhou Fasheng;Luo Gaoyong;Liu Yun;Wang Yige;Fan Lisheng
本文研究了多点协作（CoMP）中非理想回程引起的小区间和小区间干扰。提出了一种基于递归估计的迫零波束形成（RE-ZFBF）方案。基于初始值，RE-ZFBF方案通过利用时间信道相关性递归地近似两个连续时间点之间的波束形成器变化。与以前的工作相比，作者转换原来的非凸约束的服务质量的问题，一个无约束的凸的，通过优化估计的波束形成器的错误，而不是波束形成功率。结果表明，该方案可以减轻最多一半的小区间和小区间干扰，提高ZFBF性能，并优于现有的工程CoMP与非理想的回程在异构小小区网络。
In this article, intra- and inter-cell interference caused by the non-ideal backhaul in coordinated multipoint (CoMP) are studied. A recursive estimation-based zero-forcing beamforming (RE-ZFBF) scheme is proposed to mitigate the interference. Based on an initial value, the RE-ZFBF scheme recursively approximates the beamformer variation between two consecutive time points by exploiting the temporal channel correlation. In contrast to a previous work, the authors convert the original non-convex constraint quality-of-service problem to an unconstrained convex one, by optimising the estimation of the beamformer error, rather than the beamforming power. It is shown that the proposed scheme can mitigate at most half the intra- and inter-cell interference, enhance the ZFBF performance, and outperform the existing works for CoMP with a non-ideal backhaul in heterogeneous small-cell networks.
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