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Exploiting statistical and outdated CSI in multiuser downlink transmission

机译:在多用户下行传输中利用统计和过时的CSI

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In this paper, we propose a multiuser downlink transmission scheme, which exploits both the statistical and outdated channel state information (CSI) at the transmitter. The proposed scheme extends the outdated CSI-aided scheme, first introduced by Maddah-Ali and Tse in [1] (denoted as MAT), by sending symbols demanded by a user along its statistical eigenmodes, instead of directly sending the symbols through separate antennas, and we refer to it as statistical eigenmode-MAT (SE-MAT). Considering zero-forcing receiver, we explicitly prove that the proposed SE-MAT scheme can achieve a higher ergodic sum-rate compared to the original MAT scheme, under different correlation conditions. Moreover, a user selection method which selects statistically orthogonal users for the SE-MAT transmission is proposed to further improve the system performance.
机译:在本文中,我们提出了一种多用户下行链路传输方案,该方案利用了发射机处的统计信息和过时的信道状态信息(CSI)。所提出的方案扩展了由Maddah-Ali和Tse在[1](表示为MAT)中首先引入的过时的CSI辅助方案,通过沿着用户的统计本征模式发送用户所需的符号,而不是通过单独的天线直接发送符号,我们将其称为统计本征模式MAT(SE-MAT)。考虑到零强迫接收器,我们明确证明了在不同的相关条件下,所提出的SE-MAT方案与原始MAT方案相比可以实现更高的遍历总和率。此外,提出了一种选择统计正交用户以进行SE-MAT传输的用户选择方法,以进一步提高系统性能。

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