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On the Optimal Number of Cooperative Base Stations in Network MIMO Systems

J. Hoydis,M. Kobayashi,M. Debbah

Published 2009 in arXiv.org

ABSTRACT

We consider a multi-cell, frequency-selective fading, uplink channel (network MIMO) where K user terminals (UTs) communicate simultaneously with B cooperative base stations (BSs). Although the potential benefit of multi-cell cooperation grows with B, the overhead related to the acquisition of channel state information (CSI) will rapidly dominate the uplink resource. Thus, there exists a non-trivial tradeoff between the performance gains of network MIMO and the related overhead in channel estimation for a finite coherence time. Using a close approximation of the net ergodic achievable rate based on recent results from random matrix theory, we study this tradeoff by taking some realistic aspects into account such as unreliable backhaul links and different path losses between the UTs and BSs. We determine the optimal training length, the optimal number of cooperative BSs and the optimal number of sub-carriers to be used for an extended version of the circular Wyner model where each UT can communicate with B BSs. Our results provide some insight into practical limitations as well as realistic dimensions of network MIMO systems.

PUBLICATION RECORD

  • Publication year

    2009

  • Venue

    arXiv.org

  • Publication date

    2009-12-23

  • Fields of study

    Mathematics, Computer Science, Engineering

  • Identifiers
    arXiv 1003.0332
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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