NDLI: Concurrent Communication and Sensing in Cognitive Radio Devices: Challenges and an Enabling Solution

Content Provider	IEEE Xplore Digital Library
Author	Tsakalaki, E. Alrabadi, O.N. Tatomirescu, A. de Carvalho, E. Pedersen, G.F.
Copyright Year	1963
Abstract	Cognitive radios (CRs) need to continuously monitor the availability of unoccupied spectrum. Prior work on spectrum sensing mainly focused on time-slotted schemes where sensing and communication take place on different time periods in the same frequency. This however leads to a) limited CR throughput as data transmissions need to be interrupted for the sensing task, and b) unreliable detection performance since sensing happens in specific confined time durations. The paper describes the basic design challenges and hardware requirements that restrain CRs from simultaneously and continuously sensing the spectrum while transmitting in the same frequency band. The paper then describes a novel approach based on spatial filtering that promises to empower CRs with concurrent transmission and sensing capabilities. The idea is to equip the CR with redundant transmit antennas for forming an adaptive spatial filter that selectively nulls the transmit signal in the sensing direction. By doing so, a wideband isolation level of ~ 60 dB is obtained by the antenna system. Finally, by following the spatial filtering stage with active power cancellation in the radio-frequency stage and in the baseband stage, a total isolation in excess of a 100 dB required for enabling concurrent communication and sensing can be obtained.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1125
Ending Page	1137
Page Count	13
File Size	2219146
File Format	PDF
ISSN	0018926X
Volume Number	62
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensors Transmitting antennas Receiving antennas Radio frequency Vectors Hardware spatial filtering Cognitive radio full-duplexing spectrum sensing
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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