Abstract
In this paper, we propose a novel low-complexity interference-aware receiver structure for multi-user MIMO that is based on the exploitation of the structure of residual interference. We show that multi-user MIMO can deliver its promised gains in modern wireless systems in spite of the limited channel state information at the transmitter (CSIT) only if users resort to intelligent interference-aware detection rather than the conventional single-user detection. As an example, we focus on the long term evolution (LTE) system and look at the two important characteristics of the LTE precoders, i.e., their low resolution and their applying equal gain transmission (EGT). We show that EGT is characterized by full diversity in the single-user MIMO transmission but it loses diversity in the case of multi-user MIMO transmission. Reflecting on these results, we propose a LTE codebook design based on two additional feedback bits of CSIT and show that this new codebook significantly outperforms the currently standardized LTE codebooks for multi-user MIMO transmission.
Highlights
The spatial dimension surfacing from the usage of multiple antennas promises improved reliability, higher spectral efficiency [1], and the spatial separation of users [2]
In this paper, we have looked at the feasibility of the multi-user MIMO for future wireless systems that are characterized by low-level quantization of channel state information at the transmitter (CSIT)
We have shown that multi-user MIMO can deliver its promised gains if the user equipments (UEs) resort to intelligent detection rather than the sub-optimal single-user detection
Summary
The spatial dimension surfacing from the usage of multiple antennas promises improved reliability, higher spectral efficiency [1], and the spatial separation of users [2]. The transformation of crosscoupled channels into parallel non-interacting channels necessitates perfect channel state information at the transmitter (CSIT) whose acquisition in a practical system, in particular frequency division duplex (FDD) system, is far from realizable This leads to the precoding strategies based on the partial or quantized CSIT [3], which limit the gains of multi-user MIMO. Considering multi-user detection, we propose in this paper a low-complexity interference-aware receiver [6] for the multi-user MIMO in LTE. Our proposed low-complexity interference-aware receiver structure reduces one complex dimension of the system but is characterized by exploiting the interference structure in the detection process Considering this receiver structure, we investigate the effectiveness of the low-resolution LTE precoders for the multi-user MIMO mode and show that multi-user. The proof details in the paper have been relegated to appendices to keep the subject material simple and clear
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