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Performance analysis of Doppler shift effects on OFDM-based and MC-CDMA-based cognitive radios

Published: 01 November 2014 Publication History

Abstract

The present development of high data rate wireless applications has led to extra bandwidth demands. However, finding a new spectrum bandwidth to accommodate these applications and services is a challenging task because of the scarcity of spectrum resources. In fact, the spectrum is utilized inefficiently for conventional spectrum allocation, so Federal Communications Commission has proposed dynamic spectrum access mechanism in cognitive radio, where unlicensed users can opportunistically borrow unused licensed spectrum, which is a challenge to obtain contiguous frequency spectrum block. This also has a significant impact on multicarrier transmission systems such as orthogonal frequency division multiplexing OFDM and multicarrier code division multiple access MC-CDMA. As a solution, this paper develops non-contiguous OFDM NC-OFDM and non-contiguous MC-CDMA NC-MC-CDMA cognitive system. The implementation of NC-OFDM and NC-MC-CDMA systems provides high data rate via a large number of non-contiguous subcarriers without interfering with the existing transmissions. The system performance evaluates NC-OFDM and NC-MC-CDMA for mobile scenario where each propagation path will experience Doppler frequency shift because of the relative motion between the transmitter and receiver. The simulation results of this paper proved that NC-OFDM system is a superior candidate than NC-MC-CDMA system considering the mobility for cognitive users. Copyright © 2013 John Wiley & Sons, Ltd.

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Cited By

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  • (2018)QoS optimization‐based dynamic secondary spectrum access modelTransactions on Emerging Telecommunications Technologies10.1002/ett.345529:8Online publication date: 6-Aug-2018
  • (2016)Polyphase filter bank based multi-band spectrum sensing in cognitive radio systemsInternational Journal of Communication Systems10.1002/dac.279829:12(1844-1862)Online publication date: 1-Aug-2016

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    Published In

    cover image International Journal of Communication Systems
    International Journal of Communication Systems  Volume 27, Issue 11
    November 2014
    1060 pages
    ISSN:1074-5351
    EISSN:1099-1131
    Issue’s Table of Contents

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    John Wiley and Sons Ltd.

    United Kingdom

    Publication History

    Published: 01 November 2014

    Author Tags

    1. DSA
    2. Doppler shift
    3. NC-MC-CDMA
    4. NC-OFDM
    5. cognitive radio

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    View all
    • (2018)QoS optimization‐based dynamic secondary spectrum access modelTransactions on Emerging Telecommunications Technologies10.1002/ett.345529:8Online publication date: 6-Aug-2018
    • (2016)Polyphase filter bank based multi-band spectrum sensing in cognitive radio systemsInternational Journal of Communication Systems10.1002/dac.279829:12(1844-1862)Online publication date: 1-Aug-2016

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