Title :
Optimized Decision Feedback Equalizer and Comparison with MLSE Algorithm for GSM Channel
Author :
Moshfegh, Mahdi ; Rahmati, Alireza ; Hajisami, Abolfazl
Author_Institution :
Noshirvani Inst. Technol. Univ., Babol, Iran
fDate :
March 30 2011-April 1 2011
Abstract :
In this paper, we present basic equation of efficient recursive least square algorithm based on GMSK modulation by linear superposition of amplitude modulated pulses for reduction complexity in equalizer. In this here, the DFE method be improved using of signal processing technique and soft decision which is called ´´generalized DFE or GDFE method´´. We compare the performance and complexity GDFE with MLSE method for different channels used in GSM systems. The GDFE differs from the conventional DFE in its tap values and value of tap feedback filter related with channel length, which discussed in simulation result. Our simulation results, obtained for fading multi path channels, show that the GDFE scheme improves the performance 1 dB approximately in comparison with conventional DFE. The GDFE method is robust to errors channel and this is a good specific beside low complexity, which is applicable in practical systems.
Keywords :
cellular radio; fading channels; least squares approximations; minimum shift keying; multipath channels; recursive estimation; signal processing; GDFE method; GMSK modulation; GSM channel; MLSE algorithm; amplitude modulated pulses; fading multipath channels; optimized decision feedback equalizer; recursive least square algorithm; signal processing technique; tap feedback filter; Complexity theory; Decision feedback equalizers; GSM; Maximum likelihood estimation; Modulation; Receivers; DFE; Equalizer; GSM; MLSE;
Conference_Titel :
Computer Modelling and Simulation (UKSim), 2011 UkSim 13th International Conference on
Conference_Location :
Cambridge
Print_ISBN :
978-1-61284-705-4
Electronic_ISBN :
978-0-7695-4376-5
DOI :
10.1109/UKSIM.2011.98