Title :
Range Estimation in Multicarrier Systems in the Presence of Interference: Performance Limits and Optimal Signal Design
Author :
Karisan, Yasir ; Dardari, Davide ; Gezici, Sinan ; D´Amico, Antonio A. ; Mengali, Umberto
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
10/1/2011 12:00:00 AM
Abstract :
Theoretical limits on time-of-arrival (equivalently, range) estimation are derived for multicarrier systems in the presence of interference. Specifically, closed-form expressions are obtained for Cramer-Rao bounds (CRBs) in various scenarios. In addition, based on CRB expressions, an optimal power allocation (or, spectrum shaping) strategy is proposed. This strategy considers the constraints not only from the sensed interference level but also from the regulatory emission mask. Numerical results are presented to illustrate the improvements achievable with the optimal power allocation scheme, and a maximum likelihood time-of-arrival estimation algorithm is studied to assess the effects of the proposed approach in practical estimators.
Keywords :
cognitive radio; interference suppression; maximum likelihood estimation; radiofrequency interference; time-of-arrival estimation; CRB; Cramer-Rao bound; closed-form expression; cognitive radio; maximum likelihood time-of-arrival estimation algorithm; multicarrier interference system; optimal power allocation scheme; optimal signal design; range estimation; regulatory emission mask; Accuracy; Estimation; Interference; OFDM; Optimized production technology; Resource management; Time of arrival estimation; Cramer-Rao bound (CRB); Ranging; cognitive radio; interference; orthogonal frequency division multiplexing (OFDM); time-of-arrival (TOA) estimation;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2011.072511.101844
