A game theoretic approach to setting the pilot power ratio in multi-user MIMO systems

Peiyue Zhao, Gabor Fodor, Gyorgy Dan, M. Telek

Research output: Article

3 Citations (Scopus)

Abstract

We consider the uplink of a single cell multi-user multiple input multiple output (MU-MIMO) system, in which the base station acquires channel state information at the receiver by means of uplink pilot signals. Since each mobile station has a sum power budget that is used to transmit pilot and data symbols, the pilot power ratio (PPR) has a large impact on the system performance in terms of spectral and energy efficiency. We formulate the problem of PPR setting as a non-cooperative game, in which each mobile station aims at minimizing the mean squared error of the uplink received data symbols at the base station. We show that in this game a unique Nash equilibrium exists, and propose an iterative decentralized algorithm - termed best PPR algorithm (BPA) - that is guaranteed to converge to that Nash equilibrium. Since BPA dynamically responds to the measured interference, it outperforms widely used schemes that use a predetermined PPR. BPA also performs close to the global optimum, especially when mobile stations with similar path loss values are co-scheduled in the MU-MIMO system. Based on these insights, we propose a practical signaling mechanism for implementing BPA in MU-MIMO systems.

Original languageEnglish
Pages (from-to)999-1012
Number of pages14
JournalIEEE Transactions on Communications
Volume66
Issue number3
DOIs
Publication statusPublished - márc. 1 2018

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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