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Author: search.filters.author.Noppanakeepong, S.Subject: search.filters.subject.Multiaccess communication

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    Blocking probability of the reverse link cellular CDMA system
    (2002-01-01)
    Kumpairee, C.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, O.
    ;
    Hemmakorn, N.
    ;
    Noppanakeepong, S.
    The blocking probability of the reverse link cellular CDMA system is presented. Gaussian and lognormal approximation are the methods for determination of blocking probability. In the analysis in this paper, the parameter for the number of resolvable paths over a Rayleigh multipath fading channel is presented. In addition, we also show the effect of power control errors.
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    Effect of multipath fading on the Erlang capacity of imperfect power control in cellular CDMA system
    (2002-01-01)
    Omsin, S.
    ;
    Manyanon, A.
    ;
    Kimpan, C.
    ;
    Pin-Ngern, O.
    ;
    Noppanakeepong, S.
    This paper presents an approach to the evaluation of the reverse link capacity of a cellular CDMA system, which is based on using Gaussian and lognormal approximations. We include the fading channel multipath intensity profile (MIP) shape factor in the Erlang capacity formula. Imperfect power control and Rayleigh multipath fading channels are considered.
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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.
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    Outage probability of the overlapped carriers allocation scheme with imperfect power control in DS-CDMA
    (2002-01-01)
    Techotchawan, A.
    ;
    Leepila, R.
    ;
    Kimpan, C.
    ;
    Thitimajshima, P.
    ;
    Noppanakeepong, S.
    The outage probability is investigated in cellular FD/CDMA (frequency division/code division multiple access) in terms of the SNR under the overlapped carrier allocation scheme in the reverse link of a cellular radio system, which is based on using Gaussian and lognormal approximations, respectively. In numerical results, the bandlimited pulse generated by raised cosine pulse shaping filters (SRRC) of the transmitted signal is investigated and compared in conventional FD/CDMA and OC-CDMA (overlapping carrier CDMA) for the outage probability. It is also shown that the outage probability can be improved by overlapping of carriers.