Rapid carrier acquisition from baud-rate samples

Author

Yuan, W. Shaw ; Georghiades, Costas N.

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

47

Issue

4

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

631

Lastpage

641

Abstract

Maximum-likelihood estimation of phase and frequency offset involves the maximization of a nonlinear likelihood function. We develop an estimator for carrier acquisition by linearizing the likelihood-function, and show that its performance is close to the Cramer-Rao bound (CRB). The estimator is then extended to blind frequency acquisition and combined with testing to eliminate unlikely hypotheses. With proper modeling of the likelihood resulting from the blind search, simulations show that the algorithm quickly rejects all but the correct frequency hypothesis

Keywords

filtering theory; frequency estimation; least squares approximations; matched filters; maximum likelihood estimation; nonlinear functions; phase estimation; quadrature amplitude modulation; recursive estimation; search problems; signal sampling; synchronisation; CRB; Cramer-Rao bound; QAM; TDMA; baud-rate samples; blind frequency acquisition; frequency estimator; frequency hypothesis; frequency offset; least squares estimator; linear likelihood function; matched filter samples; maximum-likelihood estimation; nonlinear likelihood function; performance; phase offset; rapid carrier acquisition; recursive estimation; simulations; testing; Frequency estimation; Iterative algorithms; Maximum likelihood estimation; Phase detection; Phase estimation; Phase frequency detector; Phase measurement; Phase shift keying; Quadrature amplitude modulation; System performance;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.764936

Filename

764936