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Author: search.filters.author.Benjangkaprasert, C.Subject: search.filters.subject.LMS algorithm

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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 equalizer for DS-CDMA multi-user communication system using sign-algorithm based on Laguerre filter structure
    (2014-01-01)
    Sirithummachak, P.
    ;
    Benjangkaprasert, C.
    This paper proposes a sign-algorithm based on adaptive Laguerre filter structure for improving the performance of the direct sequence-code division multiple access (DS-CDMA) communication system. The proposed adaptive equalizer employs a combination of sign and least mean square (LMS) algorithms to minimizing the effect of inter-symbol interference (ISI) that arises due to multipath propagation, and the computational complexity of equalizer. The performance of proposed equalizer was compared with traditional equalizers such as LMS and RLS algorithms in terms of varying path. The function detail and performance results of the proposed equalizer are described by computer simulations in terms of the bit error rate (BER). © (2014) Trans Tech Publications, Switzerland.
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    Adaptive equalization for DS-CDMA multi-user communication system using Laguerre filters
    (2008-12-01)
    Somkur, T.
    ;
    Benjangkaprasert, C.
    In this paper proposes an adaptive equalizer using Laguerre transversal filter and a RLS algorithm for adaptation in DS-CDMA mobile communication systems. The Laguerre structure is compromise between the FIR and IIR structures, since the Laguerre structure is always stable. We also analyze the Bit Error Rate (BER) performance of the proposed equalizer and the conventional equalizer. The simulation results show that the performances of the proposed equalizer are better than the conventional equalizer, such as fast convergence and lower BER than the conventional adaptive equalizer for every E<inf>b</inf> / n<inf>0</inf> value.
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    Performance comparison of adaptive algorithms for multiple echo cancellation in telephone network
    (2007-12-01)
    Tingchan, W.
    ;
    Benjangkaprasert, C.
    ;
    Sangaroon, O.
    In this paper presents the comparison of the performance of the variable step-size LMS adaptive algorithm and the fixed step-size LMS adaptive algorithm for cancels multiple echoes signal in telephone networks. The core of this paper is a multiple delay estimator, which estimates and distributes delays to each individual fixed length short echo canceller. It is shown that the variable step-size LMS adaptive algorithm yields the performances over the fixed step-size LMS algorithm. Computer simulation results are provided to confirm the performances of the variable step-size LMS algorithm. ©ICROS.