Efficient User Selection and Ordering Algorithms for Successive Zero-Forcing Precoding for Multiuser MIMO Downlink

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Executive Summary

In this paper, the authors consider user scheduling problem for linearly precoded multiuser Multiple-Input Multiple-Output (MIMO) downlink, where base station as well as the mobile receivers are equipped with multiple antennas. Optimal precoding involves Dirty Paper Coding (DPC) technique, and it is highly nonlinear and complex. On the other hand, complete inter-user interference cancelation using linear zero-forcing or block diagonalization precoding are suboptimal. Hence, they consider successive zero-forcing precoding, which achieves improved system throughput compared to block diagonalization by allowing users to work under limited interference. Due to the dimensionality constraint of linear precoding techniques user scheduling is required.

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