A new short-block digital transmission scheme with adaptive MLSE for mobile radio channels

Author

Wu, Libing ; Wu, Boxiu

Author_Institution

Dept. of Radio Eng., Southeast Univ., Nanjing, China

fYear

1994

fDate

8-10 Jun 1994

Firstpage

243

Abstract

The paper is concerned with block data transmission methods employing adaptive MLSE in a digital receiver. A new scheme of short-block transmission SBED-ADMLSE is proposed to overcome the effect of error propagation on the performance of the conventional long-block transmission method LB-ADMLSE that uses decision data directly to assist adaptive channel estimation. Performance comparison between SBED-ADMLSE and LB-ADMLSE with the same transmission efficiency is performed by the simulations of 4-QAM transmission at a symbol rate of 25 kbaud with a three-path Rayleigh fading channel model. Simulation results demonstrate the effectiveness of the new scheme under severe channel environments. Error propagation is overcome by SBED-ADMLSE. The new scheme can provide superior performance at fading rates up to 30 Hz without diversity operation. With the aid of two-branch diversity, it can be advantageous at fading rates up to 70 Hz

Keywords

Rayleigh channels; adaptive equalisers; adaptive estimation; digital radio; diversity reception; error analysis; estimation theory; fading; land mobile radio; least squares approximations; maximum likelihood estimation; multipath channels; quadrature amplitude modulation; radio receivers; recursive estimation; 4-QAM; LB-ADMLSE; SBED-ADMLSE; adaptive MLSE; adaptive channel estimation; data transmission methods; digital receiver; error propagation; fading rates; long-block transmission method; mobile radio channels; performance; short-block digital transmission scheme; three-path Rayleigh fading channel model; transmission efficiency; two-branch diversity; AWGN; Channel estimation; Fading; Land mobile radio; Maximum likelihood estimation; Multipath channels; Phase estimation; Quadrature phase shift keying; Rayleigh channels; Receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1994 IEEE 44th

Conference_Location

Stockholm

ISSN

1090-3038

Print_ISBN

0-7803-1927-3

Type

conf

DOI

10.1109/VETEC.1994.345128

Filename

345128