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    Item type:Publication,
    Discrete Time Two-Frequency Shift Keying
    (2024-01-01)
    Wardkein, Paramote
    ;
    Kaew-In, Chanapat
    ;
    Wanprasert, Thanaree
    ;
    Philuek, Pandaree
    ;
    Moonthongnoi, Nateekan
    In this article, two-frequency shift keying is used to modify the time for generating the Time-Frequency Shift Keying (TFSK). Which both frequencies occupy different times and vary with a message. For this mechanism, it causes M-ary time-frequency pattern coding, where one pattern can code n bits if we have different 2n patterns, which overall code like a Pulse Width Modulation (PWM) combined with binary FSK. To confirm the proposed idea or technique, four-time-frequency coding is simulated with MATLAB, and an experiment is implemented with a commercial FSK IC. Both simulations and experimental results show that they are identical to predictions. Moreover, its bandwidth is predicted, and clock recovery is also implemented.
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    SAGC circuit design and implementation for FSK modem through radio channel
    (2021-05-19)
    Sutam, Apichat
    ;
    Magkeethum, Apiwat
    ;
    Wardkein, Paramote
    ;
    Koseeyaporn, Jeerasuda
    ;
    Sae-Chia, Sukkharak
    In this research, the sinusoidal automatic gain control circuit (SAGC) has been fabricated by using differentiator circuits, multiplier circuits, a summation circuit, a square root circuit and a division circuit. By using an Operational amplifier (Op amp) and 2 capacitors, the differentiator circuit has been constructed An Op amp and IC AD633 used as a multiplier are combined for fabricating the square root circuit [1]. Apart from evaluating the SAGC characteristics, the FSK recovery process for transmitting the (Global Positioning System) GPS coordinates through radio channel has been improved via the proposed SAGC circuit. The results show that the proposed circuits and its implementation operate perfectly and agree well with the conventional theory.