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The real and imaginary components of the frequency-based chaotic signal are simultaneously used in in-phase and quadrature branches of an IQ modulator, where each branch conveys two bits by means of a DCSK-based modulation. Schemes and operating principle of the modulator and demodulator are proposed and described. Analytical BER performance for the proposed schemes over a typical multipath Rayleigh fading channel is derived and verified by numerical simulations. Results show that the proposed scheme outperforms DCSK, CDSK and performs better with the increment of the number of channel paths. <\/jats:p>","DOI":"10.1142\/s0218127417501358","type":"journal-article","created":{"date-parts":[[2017,9,10]],"date-time":"2017-09-10T23:15:58Z","timestamp":1505085358000},"page":"1750135","source":"Crossref","is-referenced-by-count":15,"title":["On the Study of a Quadrature DCSK Modulation Scheme for Cognitive Radio"],"prefix":"10.1142","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0549-4380","authenticated-orcid":false,"given":"Nguyen Xuan","family":"Quyen","sequence":"first","affiliation":[{"name":"School of Electronics and Telecommunications, Hanoi University of Science and Technology, Vietnam"}]}],"member":"219","published-online":{"date-parts":[[2017,9,10]]},"reference":[{"key":"S0218127417501358BIB001","doi-asserted-by":"publisher","DOI":"10.1142\/S021812740300714X"},{"key":"S0218127417501358BIB002","doi-asserted-by":"publisher","DOI":"10.1049\/iet-com.2010.0643"},{"key":"S0218127417501358BIB003","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2014.2346775"},{"key":"S0218127417501358BIB004","doi-asserted-by":"publisher","DOI":"10.1142\/S0218127417500250"},{"key":"S0218127417501358BIB005","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2016.2538236"},{"key":"S0218127417501358BIB006","doi-asserted-by":"publisher","DOI":"10.1109\/TCSI.2001.972858"},{"key":"S0218127417501358BIB007","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2004.839380"},{"key":"S0218127417501358BIB008","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2009.090715"},{"key":"S0218127417501358BIB009","doi-asserted-by":"publisher","DOI":"10.1016\/j.sigpro.2008.10.023"},{"key":"S0218127417501358BIB010","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2013.071013.130225"},{"key":"S0218127417501358BIB011","doi-asserted-by":"publisher","DOI":"10.1109\/TCSII.2015.2435831"},{"key":"S0218127417501358BIB012","doi-asserted-by":"publisher","DOI":"10.1109\/TCSII.2016.2532041"},{"key":"S0218127417501358BIB013","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2015.2514089"},{"key":"S0218127417501358BIB014","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2016.2572730"},{"key":"S0218127417501358BIB015","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2015.2502259"},{"key":"S0218127417501358BIB016","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2009.2018258"},{"key":"S0218127417501358BIB018","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-662-05183-2"},{"key":"S0218127417501358BIB019","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2015.2464214"},{"key":"S0218127417501358BIB020","doi-asserted-by":"publisher","DOI":"10.1016\/j.comnet.2016.06.022"},{"key":"S0218127417501358BIB021","doi-asserted-by":"publisher","DOI":"10.1049\/iet-com.2015.1103"},{"key":"S0218127417501358BIB022","doi-asserted-by":"publisher","DOI":"10.1016\/j.aeue.2016.11.005"},{"key":"S0218127417501358BIB023","doi-asserted-by":"publisher","DOI":"10.1016\/j.phycom.2016.12.004"},{"key":"S0218127417501358BIB024","doi-asserted-by":"publisher","DOI":"10.1201\/9780203025314"},{"key":"S0218127417501358BIB026","doi-asserted-by":"publisher","DOI":"10.1016\/j.sigpro.2009.12.013"},{"key":"S0218127417501358BIB027","first-page":"81","volume":"2","author":"Yang T.","year":"2004","journal-title":"Int. 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