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Author: search.filters.author.Rattanakoch, W.

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    Analysis of forward-link capacity for DS-CDMA cellular system with power control strategy
    (2002-12-01)
    Longpichai, S.
    ;
    Rattanakoch, W.
    ;
    Kimpan, C.
    ;
    Pin-ngern, O.
    ;
    Noppanakeepong, S.
    In this paper, we analyze the forward-link capacity of a cellular DS-CDMA system, especially effect of power control strategy and orthogonality factor (f<inf>o</inf>) of multipath fading on the system. The problem of finding an optimum power control factor (n) is evaluated. According to n, the proper threshold distance is estimated for optimum performance. With these factors, the numerical results show that the capacity is reduced by changing f<inf>o</inf> from 0.7 to 0.2.
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    On the algorithm for adaptive noise canceller with parallel block structure
    (2002-01-01)
    Kidakorn, P.
    ;
    Rattanakoch, W.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, Ouen
    ;
    Noppanakeepong, S.
    An adaptive algorithm for detecting a single sinusoid of unknown frequency corrupted by Gaussian noise was proposed by Nishimura et al. (Trans. IEICE, vol. J72-A, no. 5, pp.786-794, 1989) using a IIR band pass filter with a variable center frequency and parallel block structure for fast processing. In 1996 an adaptive algorithm was investigated which solved the problem whereby the presence of several input frequencies led to the situation of it being impossible to achieve convergence using the new algorithm proposed by Takahashi et al. (Proc. IEEE APCCAS'94, pp. 376-381, 1994). However, the control signal generated by the new algorithm, used for adjusting the center frequency of the band pass filter, still jitters in spite of its convergence. In this paper, in addition to using the output in an adaptive algorithm as proposed, the input signal is used as an auxiliary or reference signal. In this way the jitter on the control signal can be reduced significantly, with the same convergence rate, with little added computational complexity.
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    Capacity analysis of forward-link in DS-CDMA cellular system with power control
    (2002-01-01)
    Longpichai, S.
    ;
    Rattanakoch, W.
    ;
    Kidakorn, P.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, O.
    In this paper, we analyze the forward-link capacity of a cellular DS-CDMA system, especially the effects of power control, path loss exponent (γ) and orthogonality factor (f<inf>0</inf>) of multipath propagation on the system. The problem of finding an optimum power control factor (n) is evaluated. According to n, the proper threshold distance is estimated for optimum performance. With these factors, the numerical results show that the capacity is reduced by changing f<inf>0</inf> from 0.7 to 0.2 and γ from 5 to 3.
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    Outage probability, throughput and delay analysis of cellular DS-CDMA system in the presence of correlated signal and interference
    (2002-01-01)
    Rattanakoch, W.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, Ouen
    ;
    Noppanakeepong, S.
    In this paper, we evaluate the performance of a cellular DS-CDMA system, by taking into account the correlation between signal and interference, to determined outage probability, throughput and delay for the reverse link with power control error. The numerical results show that when the correlation is considered the outage probability decreased, the throughput value increased, that is, the performance can be achieved.