Adaptive equalization with RLS-MLSE for frequency-selective fast fading mobile radio channels

Author

Fukawa, Kazuhiko ; Suzuki, Hiroshi

Author_Institution

NTT Radio Commun. Syst. Labs., Yokosuka, Japan

fYear

1991

fDate

2-5 Dec 1991

Firstpage

548

Abstract

The authors propose a novel adaptive equalization scheme which is a combination of the recursive least squares adaptive algorithm and maximum likelihood sequence estimation (RLS-MLSE). The performance of the scheme is demonstrated in frequency-selective fast fading mobile radio channels. RLS-MLSE employs a parallel estimation scheme in which the state of the channel is estimated by the Viterbi algorithm and the parameters of the channel impulse response are estimated by RLS. A simplified RLS algorithm and an extension to the diversity reception scheme are discussed. Computer simulations show that RLS-MLSE is suitable for 40-kb/s QPSK (quadrature phase shift keying) transmission in 900-MHz-band mobile radio systems, and that equalization with two-branch diversity operates up to a maximum Doppler frequency of 160 Hz

Keywords

adaptive filters; diversity reception; equalisers; fading; least squares approximations; mobile radio systems; phase shift keying; telecommunication channels; 900 MHz; QPSK; RLS-MLSE; UHF; adaptive equalization; diversity reception; frequency-selective fast fading mobile radio channels; performance; Adaptive algorithm; Adaptive equalizers; Frequency; Land mobile radio; Least squares approximation; Maximum likelihood estimation; Quadrature phase shift keying; Recursive estimation; Resonance light scattering; State estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services

Conference_Location

Phoenix, AZ

Print_ISBN

0-87942-697-7

Type

conf

DOI

10.1109/GLOCOM.1991.188445

Filename

188445