Frequency Offset Tolerant Demodulation for Low Data Rate and Narrowband Wireless Sensor Node

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    2 Citations (Scopus)

    Abstract

    The issue of frequency offset in low data rate, narrowband and low power communication nodes is considered in this paper. To avoid power hungry precise frequency generation, offset tolerant demodulation and detection schemes are investigated. A Short-Time DFT (ST-DFT) based detection for BFSK is introduced which improves the BER performance of an existing design by almost 1dB. Its BER performance and complexity are also compared to frequency offset tolerant DDBPSK demodulation. Additionally, the effect of wider filter required to capture signal in presence of frequency offset is considered. The trade-off between performance and complexity for different offset values and filter bandwidths is discussed. Both methods work independent of frequency offset; however, it is shown that wider filters do not affect ST-DFT BER performance in contrast with DDBPSK. This robustness is obtained at the expense of increased computational load.
    Original languageEnglish
    Title of host publication2017 11th International Conference on Signal Processing and Communication Systems (ICSPCS)
    Number of pages8
    ISBN (Electronic)978-1-5386-2887-4
    DOIs
    Publication statusPublished - 29 Jan 2018
    Event11th International Conference on Signal Processing and Communication Systems, ICSPCS 2017 - Surfers Paradise, Gold Coast, Australia
    Duration: 13 Dec 201715 Dec 2017
    Conference number: 11

    Conference

    Conference11th International Conference on Signal Processing and Communication Systems, ICSPCS 2017
    Abbreviated titleICSPCS
    Country/TerritoryAustralia
    CityGold Coast
    Period13/12/1715/12/17

    Keywords

    • phase shift keying
    • Wireless Sensor Networks (WSN)
    • Discrete Fourier transforms
    • double differential modulation
    • frequency shift keying

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