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Physical Layer Coexistence: WLAN/Radar Case Study

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Handbook of Cognitive Radio

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Abstract

Spectrum sharing of 802.11 wireless local area network (WLAN) and radars operating in co-/adjacent channel scenarios (notably 5 GHz) is a problem of considerable importance that requires new innovations. The spectrum sharing explored in this chapter is based on unilateral action by Wi-Fi networks to prevent unacceptable interference to incumbent radar and also mitigating the interference from radar to Wi-Fi. Specifically, the ability of a single Wi-Fi network inside the exclusion region is to speedily detect radar operation and to subsequently switch to a clear channel as a means of protecting them. The approach is relied on the opportunistic use of naturally occurring random quiet/idle periods in a Wi-Fi network employing distributed coordination function (DCF) to detect the presence of a radar using energy detection. Moreover, the Wi-Fi systems outside the exclusion region are modified to mitigate the interference from a pulsed search radar such that the WLAN continues to operate with no noticeable performance degradation. The radar pulse detection is required to mitigate the radar interference.

This work was supported in part by AFRL CERFER Under Contract FA8650-14-D-1722

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Authors and Affiliations

  1. University of Washington, Seattle, WA, USA

    Morteza Mehrnoush & Sumit Roy

Authors
  1. Morteza Mehrnoush
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  2. Sumit Roy
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Corresponding author

Correspondence to Morteza Mehrnoush .

Editor information

Editors and Affiliations

  1. School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, NSW, Australia

    Wei Zhang

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Mehrnoush, M., Roy, S. (2019). Physical Layer Coexistence: WLAN/Radar Case Study. In: Zhang, W. (eds) Handbook of Cognitive Radio . Springer, Singapore. https://doi.org/10.1007/978-981-10-1394-2_44

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