Title :
Blind decision feedback equalizer using dual-variance Gaussian clustering algorithm for wireless communications
Author :
Oh, Kil Nam ; Chin, Yong Ohk
Author_Institution :
Dept. of Radio Sci., ETRI, Taejon, South Korea
Abstract :
The simplified Gaussian clustering algorithm (SGCA) adopting a reduced constellation is derived, then the dual-variance Gaussian clustering algorithm (DVGCA) is proposed, which makes the soft or hard decisions using the SGCA. Since the DVGCA is extremely reduced-complexity and operates in the soft or hard decisions mode according to the variance for error level of the equalizer output, it is effective for blind equalization of high-order quadrature amplitude modulation (QAM) signals. In addition, the blind decision feedback equalizer (DFE) using the DVGCA is presented, which leads to superior performance to ones without a feedback path over the channel with in-band spectral nulls
Keywords :
Gaussian processes; computational complexity; decision feedback equalisers; quadrature amplitude modulation; radiocommunication; telecommunication channels; DFE; blind decision feedback equalizer; blind equalization; channel equalisation; dual variance Gaussian clustering algorithm; equalizer output; error level variance; hard decisions; high-order QAM signals; in-band spectral nulls; performance; quadrature amplitude modulation; reduced complexity algorithm; reduced constellation; soft decisions; wireless communications; Additive noise; Blind equalizers; Clustering algorithms; Computational complexity; Convergence; Convolution; Decision feedback equalizers; Interference; Quadrature amplitude modulation; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501401
