Multi-user spatial diversity in a shadow-fading environment

Vahid Emamian, Paul Anghel, Mostafa Kaveh

Research output: Contribution to journalConference articlepeer-review

85 Scopus citations


In a wireless network, communication between a source and a destination mobile station (DMS) fails to establish if the source or the DMS is located inside a deep shadow-fading region. In this situation, intermediate mobile stations may be used to relay the signal between the two nodes. In a cellular system the source is a base station (BS) and the DMS is a weak mobile station (MS) while in an ad-hoc network, the source and the DMS are two nodes of the network. In this paper we study the scheme of "multi-user spatial diversity" as a new method of diversity to combat the undesired shadow-fade situation. We study the case where one or several mobile stations (MSs) relay the signal between the source and the DMS, in a shadow-fading environment. We derive a formula for the average outage probability of the received signal to noise ratio at the DMS, when M intermediate MSs relay the signal from the source to the DMS according to a particular protocol. The outage probability improves as the number of the relays increases.

Original languageEnglish (US)
Pages (from-to)573-576
Number of pages4
JournalIEEE Vehicular Technology Conference
Issue number1
StatePublished - Jan 1 2002
Event56th Vehicular Technology Conference - Vancouver, BC, Canada
Duration: Sep 24 2002Sep 28 2002


  • Ad-hoc networks
  • Independent shadowing
  • Macrodiversity
  • Multi-user spatial diversity
  • Outage probability
  • Relay mobile station
  • Wireless cellular communications


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