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Access type: UnknownSubject: 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).
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    Adaptive equalization for DS-CDMA multi-user communication system based on adaptive Laguerre lattice filter
    (2010-12-01)
    Charoenphol, A.
    ;
    Lertwatechakul, M.
    ;
    Benjangkaprasert, C.
    This paper deals with an adaptive equalizer based on Laguerre lattice filter and the recursive least square (RLS) adaptive algorithm for direct sequence-code division multiple access (DS-CDMA) communication system. Intersymbol interference (ISI) arises due to multipath propagation, which destroys the code orthogonality, gives rise to multiple access interference(MAI). Therefore, the objective of this paper is to minimize the effect of ISI with a long impulse response environment based on the proposed receiver. Because of the stability of Laguerre structure is sharing the characteristic of finite impulse response (FIR) filter and infinite impulse response (IIR) filter and the low sensitively of lattice filter is an attractive characteristic. Therefore, we propose the adaptive equalization based on adaptive Laguerre lattice filter for improve the bit error rate (BER) performance of the receiver. Our simulation results show that the performance of the proposed receiver in terms of BER and the stability are better than the conventional Laguerre filter and FIR filter receivers. ©ICROS.