Open-loop spatial multiplexing and diversity communications in ad hoc networks

Raymond H Y Louie, Matthew R. McKay, Iain B. Collings

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


This paper investigates the performance of open-loop multi-antenna point-to-point links in ad hoc networks with slotted ALOHA medium access control (MAC). We consider spatial multiplexing transmission with linear maximum ratio combining and zero forcing receivers, as well as orthogonal space time block coded transmission. New closed-form expressions are derived for the outage probability, throughput and transmission capacity. Our results demonstrate that both the best performing scheme and the optimum number of transmit antennas depend on different network parameters, such as the node intensity and the signal-to-interference-and-noise ratio operating value. We then compare the performance to a network consisting of single-antenna devices and an idealized fully centrally coordinated MAC. These results show that multi-antenna schemes with a simple decentralized slotted ALOHA MAC can outperform even idealized single-antenna networks in various practical scenarios.

Original languageEnglish
Article number5673756
Pages (from-to)317-344
Number of pages28
JournalIEEE Transactions on Information Theory
Issue number1
Publication statusPublished - Jan 2011
Externally publishedYes


  • Ad hoc networks
  • linear receivers
  • multiple antennas
  • spatial multiplexing
  • throughput
  • transmission capacity


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