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On Maximum Eigenmode Beamforming and Multi-User Gain

机译：最大本征模波束成形和多用户增益

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This paper is concerned with the advantages of multi-user concurrent transmission in multiple-input multiple-output (MIMO) systems with rate constraints. We first study a maximum eigenmode beamforming (MEB) strategy for fading multiple access channels (MACs). This strategy allows each user to transmit only in its maximum eigenmode direction and applies a suboptimal matched-filter receiver with successive interference cancellation at the base station (BS). We derive a closed-form expression for the average minimum transmitted sum power required by MEB. Based on this, we show that: a) the MEB strategy is asymptotically optimal when the number of simultaneous users is sufficiently large; b) multi-user concurrent transmission has a power advantage, referred to as multi-user gain, over orthogonal transmission approaches such as time-division multiple-access; c) the number of antennas at the BS has a far stronger impact on the system performance than that at each user side. These properties are verified by simulation. Both numerical analyses and simulation results show that a major part of multi-user gain can be achieved in practical environments even with a quite small number of simultaneous users. We also study the MEB strategy for MIMO broadcast channels (BCs). The dirty paper coding (DPC) technique is necessary in this case. It is analytically shown that most observations made for MIMO MACs are extendable to MIMO BCs.
机译：本文关注具有速率约束的多输入多输出（MIMO）系统中多用户并发传输的优势。我们首先研究一种用于最大程度地淡化多路访问信道（MAC）的最大本征模波束成形（MEB）策略。该策略允许每个用户仅在其最大本征模式方向上进行发送，并在基站（BS）上应用次优匹配滤波器接收机，并进行连续干扰消除。我们为MEB所需的平均最小传输总和功率得出一个封闭形式的表达式。基于此，我们表明：a）当同时用户数量足够大时，MEB策略是渐近最优的； b）与诸如时分多址之类的正交传输方法相比，多用户并发传输具有功率优势，称为多用户增益； c）BS上的天线数量对系统性能的影响远比每个用户侧的影响大。这些属性通过仿真验证。数值分析和仿真结果都表明，即使同时用户数量很少，也可以在实际环境中实现多用户增益的主要部分。我们还研究了MIMO广播信道（BC）的MEB策略。在这种情况下，必须使用脏纸编码（DPC）技术。从分析上可以看出，对MIMO MAC所做的大多数观察都可以扩展到MIMO BC。

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