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首页> 外文期刊>International journal of communication systems >Zero-forcing and codebook based beamforming scheme forrnpractical usage of multiuser MIMO-OFDM with uplinkrnchannel sounding
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Zero-forcing and codebook based beamforming scheme forrnpractical usage of multiuser MIMO-OFDM with uplinkrnchannel sounding

机译：基于零强制和密码本的波束形成波束形成方案，用于具有上行链路信道探测的多用户MIMO-OFDM的实际使用

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摘要

Since the concept of the multiuser multiple input multiple output (MU-MIMO) system has been introduced for enhancement of capacity and flexibility, it has been accepted in various wireless standards. To enjoy the benefits of the MU-MIMO system, full or partial channel information is necessary at the transmitter, but how to use the full or partial feedback information in the practical system perspective has not been investigated well. In this paper, we analyze the interference of full usage concurrent transmission codebook based on the MU-MIMO systems and also investigate the usage of channel information for a codebook based scheme and a zero-forcing beamforming (ZFBF) scheme. Based on the analytic results, we propose two adaptive schemes for the practical usage perspective inMU-MIMO-OFDM systems. Firstly, we propose an adjustable uplink channel sounding scheme, which depends on the number of users in a given cell/sector in frequency division duplexing system, with ZFBF MU-MIMO-OFDM systems. Secondly, we propose an adaptive switching scheme, which depends on signal-to-noise ratio, between the codebook based scheme and the ZFBF scheme. The performance of the proposed scheme is evaluated with computer simulations, and the simulation results show that the proposed scheme provides the enhanced throughput over entire signal-to-noise-ratio regions. Copyright (C) 2014 John Wiley & Sons, Ltd.
机译：由于引入了多用户多输入多输出（MU-MIMO）系统的概念是为了增强容量和灵活性，因此它已被各种无线标准接受。为了享受MU-MIMO系统的好处，在发射机处必须有全部或部分信道信息，但是如何从实际系统角度使用全部或部分反馈信息尚未得到很好的研究。在本文中，我们分析了基于MU-MIMO系统的完全使用的并发传输码本的干扰，并研究了信道信息在基于码本的方案和迫零波束成形（ZFBF）方案中的使用。基于分析结果，针对MU-MIMO-OFDM系统的实际使用前景，提出了两种自适应方案。首先，我们提出了一种可调上行链路信道探测方案，该方案取决于ZFBF MU-MIMO-OFDM系统中频分双工系统中给定小区/扇区中用户的数量。其次，我们提出了一种基于码本的方案与ZFBF方案之间的自适应开关方案，该方案取决于信噪比。通过计算机仿真对所提方案的性能进行了评估，仿真结果表明所提方案在整个信噪比区域提供了更高的吞吐量。版权所有（C）2014 John Wiley＆Sons，Ltd.

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