Online Distributed Coordinated Precoding for Virtualized MIMO Networks with Delayed CSI
Juncheng Wang, Ben Liang, Min Dong, Gary Boudreau, and Hatem Abou-zeid

TL;DR
This paper proposes a distributed online precoding method for multi-cell MIMO networks with delayed CSI, effectively managing interference and power constraints to optimize virtualization demands, with proven performance bounds and low complexity.
Contribution
It introduces a novel distributed online precoding algorithm for virtualized MIMO networks with delayed CSI, providing performance guarantees and low computational complexity.
Findings
Significant performance improvement over existing methods
Provable bounds on precoding deviation
Low-complexity closed-form solution
Abstract
We consider online wireless network virtualization (WNV) in a multi-cell multiple-input multiple output (MIMO) system with delayed feedback of channel state information (CSI). Multiple service providers (SPs) simultaneously share the base station resources of an infrastructure provider (InP). We aim at minimizing the accumulated precoding deviation of the InP's actual precoder from the SPs' virtualization demands via managing both inter-SP and inter-cell interference, subject to both long-term and short-term per-cell transmit power constraints. We develop an online coordinated precoding solution and show that it provides provable performance bounds. Our precoding solution is fully distributed at each cell, based only on delayed local CSI. Furthermore, it has a closed-form expression with low computational complexity. Finally, simulation results demonstrate the substantial performance…
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