NDLI: A double loop jammer cancellation system for colocated radios

Content Provider	IEEE Xplore Digital Library
Author	Ahmed, S. Faulkner, M.
Copyright Year	2013
Description	Author affiliation: Coll. of Eng. & Sci., Victoria Univ., Melbourne, WA, Australia (Ahmed, S.; Faulkner, M.)
Abstract	Colocation of multiple base stations on one common site may result in receiver desensitization and the generation of intermodulation products when large transmit signals overwhelm the base station receivers. The paper proposes an adaptive double loop cancellation system with two reference antennas. The system is capable of producing two nulls at different frequencies. The nulls remove transmit/jamming signals before they couple into the victim receiver, and hence, prevent nonlinearities. The paper analyzes the practicality of the system. The key challenge to stop or minimize self-cancellation of the desired signal in the primary input as a result of the reference antennas coupling in desired signal samples has been addressed. A hardware prototype has been developed. It has been configured to have a maximum desired signal self-cancellation of 1.84dB. The system achieves a commendable 30dB and 50dB cancellation of two jamming signals; sufficient to reduce the interfering third-order intermodulation products well below the receiver noise floor.
Starting Page	1352
Ending Page	1355
File Size	531207
Page Count	4
File Format	PDF
ISBN	9781467362351
ISSN	21669570
DOI	10.1109/PIMRC.2013.6666350
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-08
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Jamming Receivers Antennas Base stations Interference Adaptive systems Noise
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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