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Author: search.filters.author.Thitimajshima, P.

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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.
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    Integrable Electronically Tunable Current Conveyors
    (1988-01-01)
    Surakampontorn, W.
    ;
    Thitimajshima, P.
    A generalised current conveyor, termed an electronically tunable second-generation current conveyor (ECCII), whose current-transfer ratio can be varied by electronic means, is introduced. A method is proposed for realising ECCII in monolithic integrated form providing both a positive and a negative ECCII in the same circuit. Experimental and simulation results demonstrating the circuit performance are included. Some simple applications which show that their circuit property can be varied by electronic means are also presented. © 1988, The Institution of Electrical Engineers. All rights reserved.