Turbo equalization with sequential sequence estimation over multipath fading channels

Author

Tungsrisaguan, E. ; Rajatheva, R.M.A.P.

Author_Institution

Telecommun. Program, Asian Inst. of Technol., Pathumthani, Thailand

Volume

6

Issue

3

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

93

Lastpage

95

Abstract

We investigate the performance of a turbo equalization scheme over frequency-selective fading channels, where a soft-output sequential algorithm is employed as the estimation algorithm. The advantage of this scheme comes from the low computational complexity of the sequential algorithm, which is only linearly dependent on the channel memory length. Simulation results of an 8-PSK trellis-coded modulation (TCM) system show that the performance of this scheme suffers approximately 2-dB loss compared with that of the turbo max-log maximum a posteriori (MAP) probability equalizer after 5 iterations.

Keywords

equalisers; maximum likelihood sequence estimation; multipath channels; phase shift keying; trellis coded modulation; turbo codes; 8-PSK trellis-coded modulation; TCM; channel memory length; equalization; estimation algorithm; frequency-selective fading channels; fundamental concept of turbo equalization; low computational complexity; maximum likelihood sequence; multipath fading channels; sequential sequence estimation; simulation results; soft-output sequential algorithm; turbo max-log MAP probability equalizer; Computational complexity; Computational modeling; Frequency estimation; Frequency-selective fading channels; Intersymbol interference; Iterative algorithms; Iterative decoding; Maximum likelihood decoding; Modulation coding; Performance loss;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.991143

Filename

991143