多用户快速衰落MU-MISO下行链路中的多用户分集和波束形成增益

M. Castañeda, M. Ivrlac, J. Nossek
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引用次数: 0

摘要

多用户分集是一种固有的分集形式,存在于具有多个用户的时变系统中,例如广播信道。为了利用这种多样性,必须使用机会调度程序。除了用户数量和信道波动速度外,多用户分集的程度还取决于信道的动态范围。一种通过在发射机部署多天线来增加信道有效动态范围的方案被称为机会波束形成。研究表明,在几种情况下,包括在缓慢衰落和相关衰落情况下,使用机会波束形成的多发射天线的部署增加了多用户分集的程度。然而,在这项工作中,我们表明,即使在快速衰落的情况下,部署具有机会波束形成的多个发射天线,当用户数量很大时,也会导致波束形成增益。在目前的工作中,我们考虑了单小区场景中的多用户多输出单输出(MU-MISO)下行通道。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiuser diversity and beamforming gain in a fast fading MU-MISO downlink with many users
Multiuser diversity is an inherent form of diversity present in time-varying systems with several users, like for instance the broadcast channel. An opportunistic scheduler has to be used in order to exploit this type of diversity. Besides the number of users and speed of the channel fluctuations, the degree of multiuser diversity depends on the dynamic range of the channel. A scheme that increases the effective dynamic range of the channel by deploying multiple antennas at the transmitter is called opportunistic beamforming It has been shown that the deployment of multiple transmit antennas with opportunistic beamforming increases the degree of multiuser diversity in several scenarios, including in slow fading and correlated fading scenarios. However, in this work we show that even in a fast fading scenario the deployment of multiple transmit antennas with opportunistic beamforming also results in having beamforming gain when the number of users is large. In the present work, we have considered a multiuser multiple-output single-output (MU-MISO) downlink channel in a single cell scenario.
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