Range estimation in multicarrier systems in the presence of interference: performance limits and optimal signal design
Author
Karisan, Y.
Dardari, D.
Gezici, Sinan
D'Amico, A. A.
Mengali, U.
Date
2011Source Title
IEEE Transactions on Wireless Communications
Print ISSN
1536-1276
Publisher
IEEE
Volume
10
Issue
10
Pages
3321 - 3331
Language
English
Type
ArticleItem Usage Stats
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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 radioCramer-Rao bound (CRB)
Interference
Orthogonal frequency division multiplexing (OFDM)
Ranging
Time-of-arrival (TOA) estimation