Spatial interference cancellation for multiantenna mobile ad hoc networks

Kaibin Huang*, Jeffrey G. Andrews, Dongning Guo, Robert W. Heath, Randall A. Berry

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

Interference between nodes is a critical impairment in mobile ad hoc networks. This paper studies the role of multiple antennas in mitigating such interference. Specifically, a network is studied in which receivers apply zero-forcing beamforming to cancel the strongest interferers. Assuming a network with Poisson-distributed transmitters and independent Rayleigh fading channels, the transmission capacity is derived, which gives the maximum number of successful transmissions per unit area. Mathematical tools from stochastic geometry are applied to obtain the asymptotic transmission capacity scaling and characterize the impact of inaccurate channel state information (CSI). It is shown that, if each node cancels L interferers, the transmission capacity decreases as Θ (∈1/L+1) as the outage probability ∈ vanishes. For fixed ∈, as L grows, the transmission capacity increases as Θ (L 1-2/α) where α is the path-loss exponent. Moreover, CSI inaccuracy is shown to have no effect on the transmission capacity scaling as ∈ vanishes, provided that the CSI training sequence has an appropriate length, which we derive. Numerical results suggest that canceling merely one interferer by each node may increase the transmission capacity by an order of magnitude or more, even when the CSI is imperfect.

Original languageEnglish (US)
Article number6157054
Pages (from-to)1660-1676
Number of pages17
JournalIEEE Transactions on Information Theory
Volume58
Issue number3
DOIs
StatePublished - Mar 2012

Keywords

  • Ad hoc networks
  • Rayleigh channels
  • adaptive arrays
  • channel estimation
  • interference cancellation
  • multiple-input multiple-output (MIMO)

ASJC Scopus subject areas

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

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