An adaptive soft output demodulator for low BT GMSK signals

Author

Wu, Jie ; Saulnier, Gary J.

Author_Institution

Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA

Volume

1

fYear

2002

fDate

2002

Firstpage

520

Abstract

This paper investigates a convolutional-coded system with GMSK signaling where the bandwidth-time product (BT) value is much smaller than the value used in most previous research. An adaptive soft output demodulator is proposed. Significant complexity reduction is achieved without performance loss, by using differential precoding, the Laurent (1986) signal representation and sampling the received symbols at the end of the symbol duration. The performance of the demodulator is studied in AWGN and slow flat Rayleigh fading channels through simulations.

Keywords

AWGN channels; Rayleigh channels; adaptive systems; convolutional codes; demodulators; minimum shift keying; signal representation; signal sampling; AWGN channels; GMSK signaling; Laurent signal representation; Laurent signal sampling; adaptive soft output demodulator; bandwidth-time product; complexity reduction; convolutional-coded system; differential precoding; low BT GMSK signals; simulations; slow flat Rayleigh fading channels; symbol duration; Convolution; Convolutional codes; Demodulation; Least squares approximation; Linear approximation; Maximum likelihood estimation; Modulation; Performance loss; Sampling methods; Signal representations;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th

ISSN

1090-3038

Print_ISBN

0-7803-7467-3

Type

conf

DOI

10.1109/VETECF.2002.1040398

Filename

1040398