Title :
ISI channel equalizers based on the factor graphs for M-QAM signalling
Author :
Sen, Pintu ; Gelincik, S. ; Aktas, Tugcan ; Ozgur Yilmaz, A.
Author_Institution :
Elektrik ve Elektron. Muhendisligi Bolumu, Orta Dogu Teknik Univ., Ankara, Turkey
Abstract :
In this work, we consider two methods especially for high order modulation types, namely the sum-product (SP) and linear minimum mean square error (LMMSE) algorithms, which were previously utilized to equalize the inter-symbol interference (ISI) channel. Techniques for reducing the computational complexity are proposed for the SP-based method. In addition, a new technique for the calculation of the extrinsic information is proposed, which significantly improves the performance in the LMMSE equalizer. The comparison of these proposed techniques is made through simulations carried out under the fading channel assumption.
Keywords :
equalisers; fading channels; graph theory; intersymbol interference; least mean squares methods; telecommunication signalling; ISI channel equalizers; LMMSE equalizer; M-QAM signalling; SP-based method; factor graphs; fading channel assumption; high order modulation; intersymbol interference channel equalizers; linear minimum mean square error algorithms; sum-product based method; Blogs; ISI channel; LMMSE; channel coding; factor graph; sum-product;
Conference_Titel :
Signal Processing and Communications Applications Conference (SIU), 2013 21st
Conference_Location :
Haspolat
Print_ISBN :
978-1-4673-5562-9
Electronic_ISBN :
978-1-4673-5561-2
DOI :
10.1109/SIU.2013.6531234