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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    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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    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.
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    Design and development of a high-and-low-altitude air observation system for rainmaking process in Thailand
    (2019-06-01)
    Chodkaveekityada, P.
    ;
    Wardkein, P.
    Thailand has been known as a top agricultural exporter in the world. But in every year, we miss a lot of opportunities to export some agricultural products due to drought condition. In the years 2017 and 2018, the areas in risk of a drought crisis were 47 areas throughout the whole country amounting to around 1.5 million acres. There was not enough water to grow plants in these areas. As a matter of fact, Thailand is located near the equator which has more cumulative rainfall volume than any other areas in the world. Still, drought crisis happens every year. One of the reasons behind this may be lack of valid predictive information. Weather information is very important for an agricultural country. Thailand has not invested sufficiently in building an effective weather sensor network. A compromise has been made by employing high technology to produce rain in specific areas instead to alleviate drought crisis. This work was a design and development of a high-and-low-altitude air observation system suitable for rainmaking process in Thailand that aimed to reduce the import of advanced and expensive technology.
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    Design and Development of Effective Radiosonde for Rainmaking Process in Thailand
    (2018-07-02)
    Chodkaveekityada, Peeramed
    ;
    Wardkein, Paramote
    Weather information is very useful to many activities in every country such as aeronautical, meteorological and rainmaking. Thailand is located near the equator that makes the weather in this region vary a lot and more severe than in another areas. Thailand also exports a lot of agricultural products to serve people globally. Oftentimes, rain does not fall on an intended area like an area round a dam, hence there is not enough water to provide to farmers. This work is a part of a goal to design and develop a weather observation system suitable for rainmaking in Thailand.