Signal design for multipath fading channels-Doppler and ISI barriers

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

    Abstract

    Signal design for digital communications in linear multipath fading channels is discussed. We define two extremes for the symbol rate in single-carrier systems, i.e., the Doppler barrier and the intersymbol interference (ISI) barrier and we note that it is difficult to go beyond these two barriers. The Doppler barrier is roughly equal to the Doppler spread of the channel. The ISI barrier is roughly equal to the inverse of the multipath spread of the channel. We use the time-frequency duality and show, that above the ISI barrier it is advantageous to use frequency multiplexed signals like orthogonal frequency division multiplexing (OFDM) signals, and below the Doppler barrier it is advantageous to use the corresponding time-multiplexed signals. An important parameter defining the measurability of the channel is the spread factor or the product of the Doppler spread and the multipath spread. Communications in overspread channels in which the spread factor is larger than unity is also discussed. All the results should be useful for system designers.
    Original languageEnglish
    Title of host publicationIEEE VTS 53rd Vehicular Technology Conference, Spring 2001
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Print)0-7803-6728-6
    DOIs
    Publication statusPublished - 7 Aug 2001
    MoE publication typeA4 Article in a conference publication
    Event53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring: Connecting the mobile world - Rhodes, Greece
    Duration: 6 May 20019 May 2001
    Conference number: 53

    Conference

    Conference53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring
    CountryGreece
    CityRhodes
    Period6/05/019/05/01

    Keywords

    • signal design
    • fading
    • Intersymbol interference
    • OFDM
    • spread spectrum communication
    • terminology
    • digital communication
    • aircraft
    • transmitters

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  • Cite this

    Mämmelä, A. (2001). Signal design for multipath fading channels-Doppler and ISI barriers. In IEEE VTS 53rd Vehicular Technology Conference, Spring 2001 IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/VETECS.2001.944575