Title :
Turbo equalization for non-binary coded modulation schemes over frequency selective fading channels
Author :
Doan, N.D. ; Rajatheva, R.M.A.P.
Author_Institution :
Telecommun. Program, Asian Inst. of Technol., Bangkok, Thailand
Abstract :
This paper presents a new method of equalizing and decoding multilevel coded modulation signals over frequency selective Rayleigh fading channels. A combined receiver using iterative (turbo) concept is proposed. Reliability information coming out of the soft-input soft-output (SISO) equalizer is used to get soft values at the output of the channel decoder. Specific extrinsic values out of the decoder are then fed back to the equalizer to be used as the a priori inputs. Through simulation, after only a small number of iterations (2-3), error performance of the combined receiver can be improved with good coding gains to compare with the case of separate equalizer and decoder for TCM and TTCM schemes
Keywords :
Rayleigh channels; equalisers; iterative decoding; modulation coding; turbo codes; Rayleigh fading channels; SISO equalizer; channel decoder; coding gains; combined receiver; decoding; error performance; frequency selective fading channels; iterative detection; multilevel coded modulation signals; non-binary coded modulation schemes; reliability information; soft-input soft-output equalizer; turbo equalization; AWGN; Equalizers; Fading; Finite impulse response filter; Frequency modulation; Gaussian noise; Intersymbol interference; Iterative decoding; Modulation coding; Turbo codes;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851666