Multi-antenna interference cancellation techniques for cognitive radio applications

Osman Bakr*, Mark Johnson, Raghuraman Mudumbai, Kannan Ramchandran

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

36 Scopus citations

Abstract

This paper presents a practical method for using multi-antenna radios to cancel interference in cognitive radio systems. Under this method, secondary radio transmitters use beamforming techniques to find antenna weights that place nulls at the primary receivers, and secondary radio receivers use adaptive techniques to decode in the presence of interference from primary users. As an example, we show how this scheme can be leveraged to effectively reuse the uplink band of a cellular network. However, estimating the channel responses, without causing interference and without requiring significant modifications to legacy systems, is a challenging problem. We provide an iterative method for accurate channel estimation in frequency division duplexed networks, where the uplink is independent of the downlink.

Original languageEnglish (US)
Title of host publication2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings
DOIs
StatePublished - Sep 22 2009
Event2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary
Duration: Apr 5 2009Apr 8 2009

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
ISSN (Print)1525-3511

Other

Other2009 IEEE Wireless Communications and Networking Conference, WCNC 2009
CountryHungary
CityBudapest
Period04/5/0904/8/09

ASJC Scopus subject areas

  • Engineering(all)

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