Extending OFDM Symbols to Reduce Power Consumption

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    Abstract

    Existing communication standards have limited capabilities to adapt to low SNR environments or to exploit low data rate requirements in a power efficient way. Existing techniques like e.g. control coding do not reduce the computational load when reducing data rates. In this paper, we introduce differential Extended Symbol OFDM (differential ES-OFDM) which is based on the transmission of symbols that are extended in time. This way it can operate at low SNR. Using differential BPSK modulation, approximately 2.1 dB SNR improvement per doubling of the symbol length (halving the bitrate) is obtained. The sensitivity to frequency offsets of differential ES-OFDM is basically independent of symbol extension. Extending symbols reduces the computational load on the radio modem within the transmitter which is essential to reduce overall power consumption. The differential ES-OFDM receiver architecture also offers opportunities to reduce power consumption.
    Original languageUndefined
    Title of host publicationProceedings of the 1st International Conference on Smart Grids and Green IT Systems
    Place of PublicationPorto, Portugal
    PublisherSCITEPRESS
    Pages257-262
    Number of pages6
    ISBN (Print)978-989-8565-09-9
    Publication statusPublished - 19 Apr 2012
    Event1st International Conference on Smart Grids and Green IT Systems - Porto, Portugal
    Duration: 19 Apr 201220 Apr 2012

    Publication series

    Name
    PublisherSciTePress

    Conference

    Conference1st International Conference on Smart Grids and Green IT Systems
    Period19/04/1220/04/12
    Other19-20 April 2012

    Keywords

    • METIS-286331
    • Frequency division multiplexing
    • Fourier transforms
    • EWI-21774
    • IR-80189
    • Correlation
    • Differential phase shift keying
    • Modulation

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