A hybrid mode user-location-aware network MIMO with limited feedback for cellular downlink

M. Eslami, W. Krzymień, M. Al-Shalash
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引用次数: 2

Abstract

MIMO downlink with base station coordination in a cellular network is considered. In centralized coordinated transmission from a cluster of base stations, the channel state information (CSI) of users needs to be sent to a central processor for precoding and resource allocation. Real time CSI feedback from the users to their home base station and from the base stations to the central processor is a serious challenge from a practical point of view. A hybrid mode transmission scheme with reduced feedback requirement exploiting user location information and cell sectorization is proposed, in which some users are served using single-cell multiuser MIMO (MU-MIMO) approach and some using the network MIMO approach. Using a virtual MIMO downlink channel model the feedback requirement, complexity of user scheduling and precoding/power allocation with most multiuser MIMO precoding techniques is substantially reduced compared to the corresponding case using full CSI. Dirty paper coding (DPC) and zero forcing beamforming (ZFBF) precoding techniques are used to demonstrate the performance of the hybrid mode network MIMO technique.
基于蜂窝下行链路的有限反馈混合模式用户位置感知网络MIMO
考虑了蜂窝网络中具有基站协调的MIMO下行链路。在基站集群集中协调传输中,需要将用户的信道状态信息(CSI)发送到中央处理器进行预编码和资源分配。从用户到他们的家庭基站和从基站到中央处理器的实时CSI反馈从实际的角度来看是一个严重的挑战。提出了一种利用用户位置信息和小区分块来减少反馈需求的混合模式传输方案,其中部分用户采用单小区多用户MIMO (MU-MIMO)方式,部分用户采用网络MIMO方式。使用虚拟MIMO下行信道模型,与使用完整CSI的相应情况相比,大多数多用户MIMO预编码技术的反馈需求、用户调度和预编码/功率分配的复杂性大大降低。采用脏纸编码(DPC)和零强迫波束形成(ZFBF)预编码技术验证了混合模式网络MIMO技术的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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