Achievable Outage Rate Regions for the MISO Interference Channel

TL;DR

This paper investigates the achievable outage rate regions in a two-user MISO interference channel, proposing a stochastic beamforming approach with proven independence from channel realization.

Contribution

It introduces a stochastic mapping method for beamforming in MISO interference channels with instantaneous CSI and individual outage, with a key proof of its independence from channel realization.

Findings

Defined four outage rate regions with different outage criteria

Proposed a stochastic beamforming mapping for the instantaneous CSI case

Proved the stochastic component's independence from channel realization

Abstract

We consider the slow-fading two-user multiple-input single-output (MISO) interference channel. We want to understand which rate points can be achieved, allowing a non-zero outage probability. We do so by defining four different outage rate regions. The definitions differ on whether the rates are declared in outage jointly or individually and whether the transmitters have instantaneous or statistical channel state information (CSI). The focus is on the instantaneous CSI case with individual outage, where we propose a stochastic mapping from the rate point and the channel realization to the beamforming vectors. A major contribution is that we prove that the stochastic component of this mapping is independent of the actual channel realization.