Asymptotic spectral efficiency of multiantenna links in wireless networks with limited Tx CSI

Siddhartan Govindasamy, Daniel W. Bliss, David H. Staelin

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

An asymptotic technique is presented for finding the spectral efficiency of multiantenna links in spatially distributed wireless networks where transmitters have channel-state-information (CSI) corresponding to their target receiver. Transmitters are assumed to transmit independent data streams on a limited number of channel modes which limits the rank of transmit covariance matrices. An approximation for the spectral efficiency in the interference-limited regime as a function of link-length, interferer density, number of antennas per receiver and transmitter, number of transmit streams, and path-loss exponent is derived. It is found that targeted-receiver CSI, which can be acquired with low overhead in duplex systems with reciprocity, can increase spectral efficiency several fold, particularly when link lengths are large, node density is high, or both. Additionally, the per-link spectral efficiency is found to be a function of the ratio of node density to the number of receiver antennas, and it can often be improved if nodes transmit using fewer streams. These results are validated for finite-sized systems by Monte-Carlo simulation and are asymptotic in the regime where the number of users and antennas per receiver approach infinity.

Original languageEnglish (US)
Article number6172677
Pages (from-to)5375-5387
Number of pages13
JournalIEEE Transactions on Information Theory
Volume58
Issue number8
DOIs
StatePublished - Jul 23 2012
Externally publishedYes

Keywords

  • Ad hoc networks
  • MIMO
  • antenna arrays
  • stochastic geometry
  • wireless networks

ASJC Scopus subject areas

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

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