Performance Analysis of a Power Limited Spectrum Sharing System with TAS/MRC

Fahd Ahmed Khan, Kamel Tourki, Mohamed Slim Alouini, Khalid A. Qaraqe

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Capacity of the cognitive radio network degrades due to the interference constraint from the primary network. The secondary network capacity can be enhanced in a cost effective way by means of spatial diversity, that can be achieved by adding multiple antennas on the secondary network terminals and performing antenna selection. In this paper, the performance of a multiple-input multiple-output (MIMO) secondary link with transmit antenna selection (TAS) at the transmitter and maximum ratio combining (MRC) at the receiver is analyzed. A peak transmit power constraint at the secondary transmitter is considered in addition to the interference power constraint and two scenarios are considered; 1) the MIMO cognitive system with TAS/MRC (MCS-TM) does not experience interference from the primary network (denote by MCS-TM-NI), and 2) MCS-TM does experience interference from the primary network (denote by MCS-TM-WI). The performance of both MCS-TM-NI and MCS-TM-WI is analyzed and, for a Rayleigh faded channel, closed-form expression for the outage probability is derived. In addition, closed-form expressions of the moment generating function, the symbol error rate and the ergodic capacity are obtained for the MCS-TM-NI. Asymptotic performance analysis of the MCS-TM-NI reveals that TAS/MRC in a MIMO cognitive system achieves a generalized diversity gain equal to the product of the number of transmit and receive antennas. Numerical results are also presented to corroborate the derived analytical results.

Original languageEnglish
Article number6701360
Pages (from-to)954-967
Number of pages14
JournalIEEE Transactions on Signal Processing
Volume62
Issue number4
DOIs
Publication statusPublished - 15 Feb 2014

Keywords

  • Capacity
  • cognitive radio
  • multiple-input- multiple-output
  • outage probability
  • performance analysis
  • transmit antenna selection

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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