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Author: search.filters.author.Sirithummachak, P.Subject: search.filters.subject.DS-CDMA system

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    Modified sign-algorithm for adaptive Laguerre equalizer in DS-CDMA communication systems
    (2015-01-26)
    Benjangkaprasert, C.
    ;
    Sirithummachak, P.
    ;
    Lertwatechakul, M.
    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.
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    Adaptive equalizer for DS-CDMA multi-user communication system based on Laguerre filter structure with sign-Algorithm
    (2014-11-05)
    Benjangkaprasert, C.
    ;
    Sirithummachak, P.
    In order to improve the performance of DS-CDMA receiver. This paper proposes a new adaptive equalizer that using a modified sign-Algorithm based on Laguerre filter structure. The proposed algorithm combined the construction methods of Signum operator and the difference of an error signal. The performance of proposed equalizer was compared with the conventional equalizer using LMS and RLS algorithms in multipath channel. This equalizer not only reduce the effected of ISI, MAI and AWGN but also minimizes the computational complexity when compared to the attractive RLS algorithm and support the long impulse response system. The function detail and performance result of the proposed equalizer are described by computer simulation in terms of the bit error rate (BER).