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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
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