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Author: search.filters.author.Wardkein, ParamoteSubject: search.filters.subject.LoRa

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    A Novel Multi-Slope Chirp Modulation and Demodulation with Instantaneous Chirp Rate Estimation
    (2026-05-01)
    Magkeethum, Apiwat
    ;
    Saechia, Sukkharak
    ;
    Wardkein, Paramote
    The growth of Internet of Things (IoT) applications is driving demand for Low-Power Wide-Area Networks (LPWANs) to support higher data rates with the same energy efficiency. While Long Range (LoRa) provides excellent noise immunity and receiver sensitivity, its data rate might be insufficient for some applications, including those real-time applications in which LoRa is required to have infrequent transmissions to maintain low power consumption. In this paper, a novel modulation is introduced to address these limitations by utilizing narrowband chirp to represent a data symbol with chirp slopes, called a multi-slope chirp signal. At the receiver, a new blind non-coherent detection technique is also presented to recover the proposed signal. The simulation results confirm that the proposed scheme can successfully transmit information at 2 to 4 bits per symbol, and when compared to LoRa SF 6, it reduces the Time-on-Air (ToA) by half and also achieves an improvement in spectral efficiency in the frequency domain.
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    A Practical Circuit of Cyclic Chirp Spread Spectrum Modulation for Long Range Communication
    (2022-01-01)
    Sinchai, Ananta
    ;
    Saelim, Nopparut
    ;
    Pornavalai, Chotipat
    ;
    Wardkein, Paramote
    ;
    Tuwanut, Panwit
    Various technologies have been utilized in long range communication to satisfy increasing usage of the internet of things in a wide large area. Recently, a modulating technique called cyclic chirp spread spectrum (CSS) modulation has attracted attention due to its low power usage and long-range coverage. However, a cyclic CSS circuit is complex to build. Hence, the objective of the work is to propose a practical circuit of cyclic CSS modulation. The proposed circuit is designed to complicated-free creation. To prove that the presented circuit is pragmatic, a simulation test is performed. The simulation results have illustrated that the designed circuit well generates a chirp modulating signal. Also, the proposed circuit is flexibly configurable.