Chodkaveekityada, Peeramed

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Chodkaveekityada, Peeramed
Alternative Name
Chodkaveekityada, P.
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Email
peeramed.ch@kmitl.ac.th

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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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    Item type:Publication,
    A Cyclic Shift Chirp Modulation Scheme for Analog Message with Simplified PPM Demodulation
    (2026-01-01)
    Kaew-In, Chanapat
    ;
    Wardkein, Paramote
    ;
    Chatchaiphat, Nisukan
    ;
    Chodkaveekityada, Peeramed
    In this work, a cyclic shift chirp modulation scheme with an analog message signal is presented. The demodulation process is carried out by converting the cyclic shift chirp into pulse position modulation (PPM), followed by three demodulation approaches: (i) direct LPF filtering of the PPM pulses, (ii) inversion of the PPM pulses prior to LPF filtering, and (iii) integration driven by the PPM pulses. The recovered signal in these cases corresponds to the differentiated form of the original message signal. However, when the message signal is preintegrated before PPM modulation, the subsequent demodulation via integration directly yields the original message signal, eliminating the need for an additional integration stage at the receiver. This results in a simplified and less complex receiver compared to conventional PPM schemes without input pre-integration. Analytical and experimental results are in close agreement, validating the effectiveness of the proposed method.