Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345128
