Cooperative DoA-only localization of primary users in cognitive radio networks
1 Fraunhofer Heinrich Hertz Institute, Berlin D-10587, Germany
2 Electrical Engineering Department, University of California Los Angeles (UCLA), Los Angeles, CA 90095-1594, USA
EURASIP Journal on Wireless Communications and Networking 2013, 2013:107 doi:10.1186/1687-1499-2013-107Published: 19 April 2013
In this paper, we investigate localization techniques based on direction-of-arrival (DoA) measurements to estimate the position of primary users in cognitive radio networks. In the proposed approach, different multi-antenna sensors estimate the DoA of a primary signal by subspace-based techniques and the target position is estimated from the available DoA measurements using maximum-likelihood, least-squares, or Stansfield estimators. The resulting localization performance is evaluated numerically and compared to the Cramr-Rao bound derived under a considered problem setting. The impact of several system parameters (in particular, number of sensors and number of antennas per sensors) is thoroughly analyzed and discussed.