Large System Performance and Distributed Scheme of Downlink Beamforming in F-RANs With Distributed Antennas
Large System Performance and Distributed Scheme of Downlink Beamforming in F-RANs With Distributed Antennas
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分布式天线 F-RAN 中的大系统性能和下行链路波束成形的分布式方案
DOI:
10.1109/access.2019.2903881
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发表时间:
2019-03
期刊:
影响因子:
3.9
通讯作者:
You Xiaohu
中科院分区:
文献类型:
--
作者:
Zhu Pengcheng;Li Jiamin;Wang Dongming;You Xiaohu
This paper addresses the performance of downlink beamforming in fog radio access networks (F-RANs) with distributed antennas. The wireless channel is modeled as Rician fading. We analyze the asymptotic behavior of the signal-to-interference-plus-noise ratio (SINR) and the data rate of maximum ratio transmission (MRT) and regularized zero-forcing (RZF) beamformers in the large system limit, where the numbers of antennas and users go to infinity while keeping a fixed ratio. In some practical F-RAN environment, it is difficult to perform centralized processing and share channel state information (CSI) globally, so distributed beamforming schemes are of interest. Therefore, we propose the local zero-forcing (ZF) beamformer that relies only on local CSI. The simulation results show that the asymptotic results of MRT and RZF are accurate for finite system size, and the local ZF beamformer provides a tradeoff between MRT and RZF in terms of CSI sharing complexity and interference control ability.
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