Performance of CSI-Based Multi-User MIMO for the LTE Downlink

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Executive Summary

The authors consider the application of a Channel State Information (CSI) based Multi-User (MU) Multiple Input Multiple Output (MIMO) scheme to the downlink of 3GPP Long Term Evolution (LTE) cellular networks. For that purpose, they propose a novel feedback method for providing CSI to the Base Stations (BSs) based upon standard vector quantization techniques. Moreover, they introduce and compare different ways for additionally signaling information about the interference situation observed by a certain User Equipment (UE) to its serving BS. Apart from the actual CSI itself, the interference information is essential for choosing appropriate pre-coders and particularly for facilitating an efficient link adaptation.

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