Outage Efficient Strategies for Network MIMO with Partial CSIT
Mari Kobayashi, Sheng Yang, Merouane Debbah, Jean-Claude Belfiore

TL;DR
This paper proposes outage-efficient strategies for network MIMO systems with partial CSIT, demonstrating that distributed zero-forcing and diversity scheduling can achieve near-optimal reliability and diversity gains even with limited channel information and backhaul.
Contribution
It introduces a robust power allocation and a distributed diversity scheduling scheme that optimize outage performance in network MIMO with partial CSIT and limited backhaul.
Findings
Achieves diversity gain of B(M-K+1) for small K
Distributed diversity scheduling scales optimally with B and K
Numerical results show high data rates with reliability under partial CSIT
Abstract
We consider a multi-cell MIMO downlink (network MIMO) where base-stations (BS) with antennas connected to a central station (CS) serve single-antenna user terminals (UT). Although many works have shown the potential benefits of network MIMO, the conclusion critically depends on the underlying assumptions such as channel state information at transmitters (CSIT) and backhaul links. In this paper, by focusing on the impact of partial CSIT, we propose an outage-efficient strategy. Namely, with side information of all UT's messages and local CSIT, each BS applies zero-forcing (ZF) beamforming in a distributed manner. For a small number of UTs (), the ZF beamforming creates parallel MISO channels. Based on the statistical knowledge of these parallel channels, the CS performs a robust power allocation that simultaneously minimizes the outage probability of all UTs and…
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