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
PublisherInstitute of Electrical and Electronic Engineers IEEE
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

Publication series

Name
ISSN (Print)1090-3038

Conference

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

Fingerprint

fading
interference
pulse communication
frequency division multiplexing
time signals
wireless communication
unity
communication
products

Keywords

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

Cite this

Mämmelä, A. (2001). Signal design for multipath fading channels-Doppler and ISI barriers. In IEEE VTS 53rd Vehicular Technology Conference, Spring 2001 Institute of Electrical and Electronic Engineers IEEE. https://doi.org/10.1109/VETECS.2001.944575
Mämmelä, Aarne. / Signal design for multipath fading channels-Doppler and ISI barriers. IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Institute of Electrical and Electronic Engineers IEEE, 2001.
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Mämmelä, A 2001, Signal design for multipath fading channels-Doppler and ISI barriers. in IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Institute of Electrical and Electronic Engineers IEEE, 53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring, Rhodes, Greece, 6/05/01. https://doi.org/10.1109/VETECS.2001.944575

Signal design for multipath fading channels-Doppler and ISI barriers. / Mämmelä, Aarne.

IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Institute of Electrical and Electronic Engineers IEEE, 2001.

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

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N2 - 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.

AB - 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.

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