Semi-blind maximum a posteriori multipath fast fading channel estimation for TDMA systems

Author

Siala, Mohamed ; Gibert, Rafel Bru

Author_Institution

France Telecom, CNET, Issy-les-Moulineaux, France

Volume

1

fYear

1999

fDate

1999

Firstpage

466

Abstract

We propose a maximum a posteriori burst-by-burst multipath fast fading channel estimation algorithm for TDMA systems. This algorithm performs a semi-blind iterative channel estimation using the SAGE algorithm. It uses both CAZAC reference sequences and unknown symbols in the optimization of this channel estimation. It requires a convenient representation of the multipath fading channel using a discrete version of the Karhunen-Loeve expansion theorem. It also requires a trellis representation of the channel for an optimum characterization of data symbols by their a posteriori conditional probabilities. The computation of these probabilities can be realized via the Bahl or BCJR algorithm. The performance of our algorithm is evaluated by simulation for 4-PSK modulated TDMA systems

Keywords

Karhunen-Loeve transforms; fading channels; iterative methods; maximum likelihood estimation; multipath channels; optimisation; phase shift keying; probability; sequences; time division multiple access; 4-PSK modulated TDMA systems; BCJR algorithm; Bahl algorithm; CAZAC reference sequences; Karhunen-Loeve expansion theorem; SAGE algorithm; TDMA systems; a posteriori conditional probabilities; burst-by-burst multipath fast fading channel estimation algorithm; data symbols; optimization; optimum characterization; performance; semi-blind iterative channel estimation; semi-blind maximum a posteriori multipath fast fading channel estimation; simulation; trellis representation; unknown symbols; Autocorrelation; Channel estimation; Computational modeling; Fading; GSM; Interference; Iterative algorithms; Quadrature phase shift keying; Telecommunications; Time division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th

Conference_Location

Amsterdam

ISSN

1090-3038

Print_ISBN

0-7803-5435-4

Type

conf

DOI

10.1109/VETECF.1999.797178

Filename

797178