On remote radio head selection for the downlink of backhaul constrained network MIMO systems

Seok Hwan Park, Osvaldo Simeone, Onur Sahin, Shlomo Shitz Shamai

Research output: Contribution to conferencePaperpeer-review

Abstract

A relevant architecture to enable network MIMO in cellular systems consists of a central unit that is connected to remote radio heads (RRHs) via a shared wireless backhaul link. This letter studies the impact of RRH selection in this system under the two extreme scenarios of perfect and stale channel state information (CSI) at the central unit. It is shown that in both cases, RRH selection based on the instantaneous conditions or the long-term statistics of the backhaul links and of the access channels (i.e., from RRHs to mobile stations) significantly improves the sum-rate performance. The presented results also demonstrate that, in the presence of shared backhaul limitations, the classical precoding design based on the maximization of the number of degrees of freedom (DOFs) on the access channels leads to strictly suboptimal performance even when the access channels operate in the high SNR regime.

Original languageEnglish (US)
DOIs
StatePublished - Jan 1 2014
Event2014 48th Annual Conference on Information Sciences and Systems, CISS 2014 - Princeton, NJ, United States
Duration: Mar 19 2014Mar 21 2014

Other

Other2014 48th Annual Conference on Information Sciences and Systems, CISS 2014
Country/TerritoryUnited States
CityPrinceton, NJ
Period3/19/143/21/14

All Science Journal Classification (ASJC) codes

  • Information Systems

Keywords

  • Network MIMO
  • cloud radio access network
  • constrained backhaul
  • degrees of freedom
  • distributed antenna system

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