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The true Cramer-Rao bound for carrier frequency estimation from a PSK signal

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3 Author(s)
Noels, N. ; Telecommun. & Inf. Process. Dept., Ghent Univ., Gent, Belgium ; Steendam, H. ; Moeneclaey, M.

This paper considers the Cramer-Rao bound (CRB) related to estimating the carrier frequency of a noisy phase-shift keying signal. The following scenarios are discussed: 1) carrier frequency estimation irrespective of the carrier phase, based on either known or random data and 2) joint carrier phase and frequency estimation, based on either known or random data. Ideal symbol timing is assumed. We compare the results obtained from a (commonly used) simplified observation model against those resulting from the correct model. Because of the presence of nuisance parameters (random data and/or random carrier phase), the analytical computation of the corresponding CRBs is often not feasible. Here we present results that are based upon a combined analytical/numerical approach. Our results show that the choice of the observation model has essentially no effect on the CRBs at moderate and high signal-to-noise ratios. We also show that of the two scenarios considered, joint frequency and phase estimation yields the smaller CRB; the penalty resulting from frequency estimation, irrespective of the carrier phase, decreases with increasing observation interval.

Published in:

Communications, IEEE Transactions on  (Volume:52 ,  Issue: 5 )

Date of Publication:

May 2004

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