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Simultaneous Sensing and Transmission for Cognitive Radios With Imperfect Signal Cancellation
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2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 9, p. 5599-5615Article in journal (Refereed) Published
Abstract [en]

In conventional cognitive radio systems, the secondary user employs a “listen-before-talk” paradigm, where it senses if the primary user is active or idle, before it decides to access the licensed spectrum. However, this method faces challenges, with the most important one being the reduction of the secondary user's throughput, as no data transmission takes place during the sensing period. In this context, the idea of simultaneous spectrum sensing and data transmission is proposed. This paper studies a system model where this concept is obtained through the collaboration of the secondary transmitter with the secondary receiver. First, the secondary receiver decodes the signal from the secondary transmitter, removes it from the total received signal, and then carries out spectrum sensing in the remaining signal in order to determine the presence/absence of the primary user. Different from the existing literature, this paper considers the imperfect signal cancellation, evaluating how the decoding errors affect the sensing reliability, and derives the analytical expressions for the probability of false alarm. Finally, numerical results are presented illustrating the accuracy of the proposed analysis.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. Vol. 16, no 9, p. 5599-5615
Keywords [en]
Cognitive radio, decoding, radio spectrum management, signal detection, cognitive radio, data transmission, decoding errors, false alarm probability, imperfect signal cancellation, licensed spectrum, listen-before-talk paradigm, primary user, secondary receiver, secondary transmitter, secondary user, sensing period, sensing reliability, simultaneous spectrum sensing, cognitive radio, data communication, detectors, interference, radio transmitters, receivers, cognitive radio;energy detector, imperfect signal cancellation, simultaneous sensing and transmission, truncated chi-squared distribution
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-258985DOI: 10.1109/TWC.2017.2712647ISI: 000409982900003Scopus ID: 2-s2.0-85030546754OAI: oai:DiVA.org:kth-258985DiVA, id: diva2:1350494
Note

QC 20191028

Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-10-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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