Offset Tolerant Demodulator for Frequency/Phase Modulation in Time-Varying Channel

Siavash Safapourhajari, Andre B.J. Kokkeler

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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    Carrier frequency offset (CFO) and time-varying fading channels are two problems that emerging ultra-narrowband solutions for Internet of Things and Wireless Sensor Networks need to tackle. Previously, an offset tolerant demodulator for Double Differential PSK (DDPSK) has been proposed to overcome CFO. To combat channel distortion, time or frequency diversity together with coding techniques can be utilized. However, these necessitate transmitting extra bits and leads to an increase in packet time. A longer packet time corresponds to longer on-time of the RF front-end and more power consumption. To avoid longer packet for the same symbol rate, a higher order modulation is required which considerably degrades BER performance. In this work, instead of higher order DDPSK, hybrid frequency/phase modulation is used. An offset tolerant demodulator for hybrid modulation is proposed which provides the same robustness against CFO as DDPSK. Besides, it provides higher order of modulation with less performance loss compared to higher order DDPSK. Simulation results show that a combination of BFSK and QPSK using the proposed demodulator can achieve almost 4 dB improvement at BER=0.001 in a Rayleigh channel compared to Double Differential 8PSK (DD8PSK) which can provide the same modulation order.

    Original languageEnglish
    Title of host publication2019 IEEE Wireless Communications and Networking Conference (WCNC)
    Place of PublicationPiscataway, NJ
    Number of pages6
    ISBN (Electronic)978-1-5386-7646-2
    ISBN (Print)978-1-5386-7647-9
    Publication statusPublished - 31 Oct 2019
    EventIEEE Wireless Communications and NetworkingConference, WCNC 2019: Touch throufh Wireless - Ryad Mogador Hotel & Palais des Congrès, Marrakech, Morocco
    Duration: 15 Apr 201919 Apr 2019

    Publication series

    NameIEEE Wireless Communications and Networking Conference, WCNC
    ISSN (Print)1525-3511
    ISSN (Electronic)1558-2612


    ConferenceIEEE Wireless Communications and NetworkingConference, WCNC 2019
    Abbreviated titleWCNC 2019
    Internet address


    • Frequency offset
    • Frequency/phase modulation
    • Time-varying channel
    • Ultra-narrowband


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