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Aggregate Interference of Equidistant Cognitive Radios

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Abstract

In spite of spectrum sensing, aggregate interference from cognitive radios (CRs) remains as a deterring factor to the implementation of spectrum sharing strategies. We provide a systematic approach of evaluating the aggregate interference (I aggr) experienced at a victim primary receiver (PR). In our approach, we model the received power versus distance relations between a primary transmitter (PT), PR, and CRs. CRs can spatially reuse a channel and thus two adjacent CRs are separated by the co-channel reuse distance (R). Our analytical framework differs from the existing ones in that we have formulated I aggr in terms of R and sensing inaccuracy. Energy detector is assumed for the purpose of spectrum sensing. I aggr is expressed explicitly as a function of the number of energy samples collected (N) and the threshold SNR level used for comparison (SNR ε ). This allows us to assess their impacts on I aggr. A numerical example is constructed based on the scenario of spectrum sharing between DTV broadcast and IEEE 802.22 Wireless Regional Area Network. Our analysis demonstrates the extents of which I aggr can be restricted, by increasing R or sensing accuracy (either by increasing N or decreasing SNR ε ), and the amount of increment required. Conditioned on the example scenario, the critical {N, SNR ε , R} values that fulfill certain regulatory requirement are revealed.

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Authors and Affiliations

  1. Faculty of Engineering, Multimedia University, 63100, Cyberjaya, Selangor, Malaysia

    Yee-Loo Foo

  2. Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan

    Jun-ichi Takada

Authors
  1. Yee-Loo Foo
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  2. Jun-ichi Takada
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Correspondence to Yee-Loo Foo.

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Foo, YL., Takada, Ji. Aggregate Interference of Equidistant Cognitive Radios. Wireless Pers Commun 92, 1053–1069 (2017). https://doi.org/10.1007/s11277-016-3592-2

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  • DOI: https://doi.org/10.1007/s11277-016-3592-2

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