Cooperative spectral covariance sensing under correlated shadowing

Jaeweon Kim, Chan Byoung Chae, Jeffrey G. Andrews

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper investigates the theoretical limits of white space sensing in a cognitive radio (CR) network limited by channel correlation. In a log-normal shadowing channel, the received signal power is correlated based on the distance between the sensors and this makes sensing the presence of a signal difficult, even with several cooperative sensors. In the proposed system, each sensor uses the spectral covariance sensing (SCS) algorithm to detect the primary signal and then sends its decision statistic to the base station (BS). The BS, using the Neyman-Pearson log-likelihood ratio test, makes the final decision. We analyze the probability of a false alarm (P FA) and compare it with that of the cooperative energy detector. We show that an asymptotic lower bound on the P FA is an order of magnitude lower than that of the energy detector. We also demonstrate improvements in the cooperation gain in terms of the effective number of independent sensors, and the required number of sensors for a given detection metric. The results of this paper show that cooperative SCS detection has far better white space sensing properties than cooperative energy detection in correlated channels.

Original languageEnglish
Article number6036017
Pages (from-to)3589-3593
Number of pages5
JournalIEEE Transactions on Wireless Communications
Volume10
Issue number11
DOIs
Publication statusPublished - 2011 Nov 1

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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