Preamble-less nondecision-aided (NDA) feedforward synchronization techniques for 16-QAM TDMA demodulators

Author

Efstathiou, Dimitrios ; Aghvami, A. Hammid

Author_Institution

Commun. Div., Analog Devices, Greensboro, NC, USA

Volume

47

Issue

2

fYear

1998

fDate

5/1/1998 12:00:00 AM

Firstpage

673

Lastpage

685

Abstract

In this paper, the performance of fully digital synchronization techniques for time-division multiple-access (TDMA) differentially encoded 16-QAM signal transmission, over cellular mobile radio channels, is considered. The preamble-less feedforward nondecision-aided (FF-NDA) synchronization techniques used for symbol timing recovery, carrier phase recovery and amplitude gain control to overcome Rayleigh fading channel impairments, are described. Novel techniques for digital amplitude gain estimation are presented. The performance of the synchronization parameters´ estimators at the receiver is evaluated by computer simulation over additive white Gaussian noise (AWGN) and slow Rayleigh fading environment. Statistical properties of the algorithms developed are evaluated in terms of the bias and variance of the estimated errors and are compared to the Cramer-Rao lower bound

Keywords

Gaussian channels; Rayleigh channels; amplitude estimation; cellular radio; demodulation; digital radio; fading; feedforward; modulation coding; quadrature amplitude modulation; synchronisation; time division multiple access; 16-QAM TDMA demodulators; Cramer-Rao lower bound; FF-NDA; Rayleigh fading channel impairments; additive white Gaussian noise; amplitude gain control; bias; carrier phase recovery; cellular mobile radio channels; differentially encoded 16-QAM; digital amplitude gain estimation; fully digital synchronization techniques; performance; preamble-less nondecision-aided feedforward synchronization techniques; receiver; slow Rayleigh fading; symbol timing recovery; time-division multiple-access; variance; AWGN; Amplitude estimation; Computer simulation; Fading; Gain control; Land mobile radio; Parameter estimation; Receivers; Time division multiple access; Timing;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.669104

Filename

669104