Analysis on detection probability based primary user localization algorithm in cognitive radio networks

作者：Ma Zhi Yao^*; Chen Wei; Cao Zhi Gang

来源：Journal of Beijing University of Posts and Telecommunications, 2009, 32(2): 14-19.

• Cognitive radio
• Cramer-Rao lower bound
• Detection probability
• Energy detection
• Range-based localization
• Weighted least squares method

A detection probability based iterative localization algorithm using weighted least squares method is proposed to solve the secondary users'; problem of locating the primary users in cognitive radio networks. The primary users'; transmission model is described as a 2-state Markov model and energy detection is used by secondary users for sensing. The proposed algorithm leverages the cooperative spectrum sensing to locate the primary users and is working transparently to the primary system. Furthermore, the proposed localization algorithm is able to acquire the three-dimensional position information of the primary user. Next, a simplified version of the algorithm is introduced to reduce the complexity. We have also conducted an evaluation and obtained the Cramer-Rao lower bound (CRLB) in terms of the mean square error of the algorithm. Simulation shows that the performance of the improved algorithm approaches the CRLB and is able to estimate the three-dimensional positions of the primary users effectively and promote the localization precision.

• 出版日期2009