Title :
Modified sign-algorithm for adaptive Laguerre equalizer in DS-CDMA communication systems
Author :
Benjangkaprasert, C. ; Sirithummachak, P. ; Lertwatechakul, M.
Author_Institution :
Fac. of Eng., King Mongkut´s Inst. of Technol., Bangkok, Thailand
Abstract :
This paper aims to improve the performance of DS-CDMA receiver by using a new adaptive equalizer with a modified sign-algorithm based on Laguerre filter structure. The proposed algorithm is modified version of the conventional sign-regressor algorithm for a Laguerre filter. By the simulation result, the BER performance of the proposed algorithm is shown to be better than the classical sign-regressor (SR) algorithm and the recursive least square (RLS) algorithm in multipath channel. This equalizer not only reduce the effected of ISI, MAI and the implementation cost, but also minimizes the computational complexity and supports the long impulse response system.
Keywords :
adaptive equalisers; code division multiple access; computational complexity; error statistics; interference suppression; intersymbol interference; least squares approximations; multipath channels; radio receivers; recursive filters; spread spectrum communication; stochastic processes; transient response; BER performance; DS-CDMA communication system; DS-CDMA receiver; ISI reduction; Laguerre filter structure; MAI reduction; RLS algorithm; SR algorithm; adaptive Laguerre equalizer; computational complexity minimizes; implementation cost reduction; impulse response system; intersymbol interference; modified sign-regressor algorithm; multiaccess interference; multipath channel; recursive least square algorithm; Adaptive equalizers; Adaptive filters; Adaptive systems; Bit error rate; Filtering algorithms; Multiaccess communication; DS-CDMA system; Laguerre equalizer; RLS algorithm; Sign algorithm;
Conference_Titel :
TENCON 2014 - 2014 IEEE Region 10 Conference
Conference_Location :
Bangkok
Print_ISBN :
978-1-4799-4076-9
DOI :
10.1109/TENCON.2014.7022344
