Optimum and suboptimum frame synchronization for pilot-symbol-assisted modulation

Author

Gansman, Jerome A. ; Fitz, Michael P. ; Krogmeier, James V.

Author_Institution

Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA

Volume

45

Issue

10

fYear

1997

fDate

10/1/1997 12:00:00 AM

Firstpage

1327

Lastpage

1337

Abstract

Pilot-symbol-assisted modulation (PSAM) is a method to reduce the effects of fading in mobile communications by periodically inserting known symbols in the data stream. The receiver uses these pilot symbols to derive its amplitude and phase reference. One aspect of this procedure which has not received much attention in the literature is the method used by the receiver to locate the pilot symbols. This paper uses optimum frame synchronization techniques to develop two synchronizers for PSAM systems; one is based on a standard maximum likelihood (ML) estimation formulation, and the other is a sequential testing algorithm. Both methods use a simple quadratic correlation filter with an energy correction factor. Simulation results and a theoretical analysis are presented

Keywords

Gaussian channels; Rayleigh channels; data communication; fading; land mobile radio; maximum likelihood estimation; mobile communication; phase shift keying; quadrature amplitude modulation; synchronisation; PSAM systems; amplitude; data stream; energy correction factor; fading; mobile communications; optimum frame synchronization; phase reference; pilot-symbol-assisted modulation; receiver; sequential testing algorithm; simple quadratic correlation filter; standard maximum likelihood estimation formulation; suboptimum frame synchronization; Demodulation; Error correction; Fading; Filters; Maximum likelihood estimation; Mobile communication; Sequential analysis; Standards development; State estimation; System testing;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.634696

Filename

634696