Performance analysis of distributed beamforming in a spectrum sharing system

Liang Yang, Khalid Qaraqe, Erchin Serpedin, Mohamed Slim Alouini

Research output: Contribution to journalArticle

4 Citations (Scopus)


In this paper, we consider a distributed beamforming scheme (DBF) in a spectrum sharing system where multiple secondary users share the spectrum with some licensed primary users under an interference temperature constraint. We assume that the DBF is applied at the secondary users. We first consider optimal beamforming and compare it with the user selection scheme in terms of the outage probability and bit error rate performance metrics. Since perfect feedback is difficult to obtain, we then investigate a limited feedback DBF scheme and develop an analysis for a random vector quantization design algorithm. Specifically, the approximate statistics functions of the squared inner product between the optimal and quantized vectors are derived. With these statistics, we analyze the outage performance. Furthermore, the effects of channel estimation error and number of primary users on the system performance are investigated. Finally, optimal power adaptation and cochannel interference are considered and analyzed. Numerical and simulation results are provided to illustrate our mathematical formalism and verify our analysis.

Original languageEnglish
Article number6376265
Pages (from-to)1655-1666
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Issue number4
Publication statusPublished - 2013



  • Cognitive radio
  • distributed beamforming
  • multiuser diversity
  • spectrum sharing

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Computer Networks and Communications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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