Interpolation-Based Interference Rejection Combining for Black-Space Cognitive Radio in Time-Varying Channels

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Abstract

In this paper, we investigate multi-antenna interference rejection combing (IRC) based black-space cognitive radio (BS-CR) operation in time-varying channels. The idea of BS-CR is to transmit secondary user (SU) signal in the same frequency band with the primary user (PU) such that SU’s power spectral density is clearly below that of the PU, and no significant interference is inflicted on the PU receivers. We explore the effects of interpolation and mobility on the novel blind IRC technique which allows such operation mode for effective reuse of the PU spectrum for relatively short-distance CR communication. We assume that both the PU system and the BS-CR use orthogonal frequency division multiplexing (OFDM) waveforms with common numerology. In this case the PU interference on the BS-CR signal is strictly flat-fading at subcarrier level. Sample covariance matrix-based IRC adaptation is applied during silent gaps in CR operation. We propose an interpolation-based scheme for tracking the spatial covariance in time-varying channels, demonstrating significantly improved robustness compared to the earlier scheme. The performance of the proposed IRC scheme is tested considering terrestrial digital TV broadcasting (DVB-T) as the primary service. The resulting interference suppression capability is evaluated with different PU interference power levels, silent gap durations, data block lengths, and CR device mobilities.

Original languageEnglish
Title of host publicationCognitive Radio-Oriented Wireless Networks - 14th EAI International Conference, CrownCom 2019
EditorsFaouzi Bader, Pawel Kryszkiewicz, Nikos Dimitriou, Adrian Kliks, Michal Sybis, Dionysia Triantafyllopoulou, Carlos E. Caicedo, Aydin Sezgin
PublisherSpringer Verlag
Pages168-179
Number of pages12
ISBN (Print)9783030257477
DOIs
Publication statusPublished - 2019
Publication typeA4 Article in a conference publication
EventEAI International Conference on Cognitive Radio-Oriented Wireless Networks - Poznan, Poland
Duration: 11 Jun 201912 Jun 2019

Publication series

NameLecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering
Volume291
ISSN (Print)1867-8211

Conference

ConferenceEAI International Conference on Cognitive Radio-Oriented Wireless Networks
Country/TerritoryPoland
CityPoznan
Period11/06/1912/06/19

Keywords

  • Black-space cognitive radio
  • DVB-T
  • Interference rejection combining
  • IRC
  • Mobility
  • Multi-antenna system
  • OFDM
  • Receiver diversity
  • Underlay CR

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Computer Networks and Communications

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