A Continuous Vector-Perturbation for Multi-Antenna Multi-User Communication

TL;DR

This paper introduces a continuous vector perturbation method for multi-antenna multi-user communication systems that enhances sum-rate performance without requiring the receiver to know the precoding matrix.

Contribution

It proposes a novel continuous perturbation technique that is transparent to the receiver and does not need precoding matrix information for decoding.

Findings

Improves sum-rate in multi-user MIMO systems.

Perturbation acts as interference, simplifying decoding.

Maximizes SNR or minimizes MMSE for perturbation derivation.

Abstract

The sum-rate of the broadcast channel in a multi-antenna multi-user communication system can be achieved by using precoding and adding a regular perturbation to the data vector. The perturbation can be removed by the modulus function, thus transparent to the receiver, but the information of the precoding matrix is needed to decode the symbols. This paper proposes a new technique to improve the multi-antenna multi-user system, by adding a continuous perturbation to the data vector without the need of information on the precoding matrix to be known at the receiver. The perturbation vector will be treated as interference at the receiver, thus it will be transparent to the receiver. The derivation of the continuous vector perturbation is provided by maximizing the signal-to-interference plus noise ratio or minimizing the minimum mean square error of the received signal.