Title :
Decision feedback-MLSE adaptive equalization of the mobile radio channel
Author :
Valdovinos, Antonio ; Gutiérrez, Fernando ; De Mingo, Jesús
Author_Institution :
Dept. de Ingenieria Electron. Commun., Zaragoza Univ., Spain
Abstract :
This paper presents an analysis of the behavior of different equalization techniques, focusing on the performance of the MLSE (maximum likelihood sequence estimator) by reducing the number of states in the trellis by means of decision feedback in the Viterbi algorithm (DFSE algorithm). The performance of 4 and 16-QAM outdoor mobile radio systems that use adaptive channel equalization techniques is investigated in outdoor environments taking into account a cellular structure. The influence of various system and channel parameters, such as the bit rate, the vehicle speed, the impulse response estimation, the adaptive algorithm (RLS) and the effect of decision feedback in the Viterbi algorithm performance have been studied. Performance results have been compared with those obtained by means of less complex DFE (decision feedback equalizer) structures in terms of bit error rate
Keywords :
adaptive equalisers; adaptive estimation; cellular radio; cochannel interference; decision feedback equalisers; digital radio; error statistics; maximum likelihood sequence estimation; quadrature amplitude modulation; telecommunication channels; 16-QAM; 4-QAM; DFE; DFSE algorithm; MLSE adaptive equalization; RLS; Viterbi algorithm; adaptive algorithm; adaptive channel equalization; bit error rate; cellular structure; channel parameters; cochannel interference; decision feedback equalizer; digital radio; impulse response estimation; maximum likelihood sequence estimator; mobile radio channel; outdoor mobile radio systems; performance; system parameters; vehicle speed; Adaptive equalizers; Adaptive systems; Algorithm design and analysis; Decision feedback equalizers; Land mobile radio; Maximum likelihood estimation; Performance analysis; State estimation; State feedback; Viterbi algorithm;
Conference_Titel :
Electrotechnical Conference, 1998. MELECON 98., 9th Mediterranean
Conference_Location :
Tel-Aviv
Print_ISBN :
0-7803-3879-0
DOI :
10.1109/MELCON.1998.699312
