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QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane

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dc.contributor.author Kushnirenko, Oleg
dc.contributor.author Sadchenko, Andrey
dc.date.accessioned 2019-04-19T05:40:39Z
dc.date.available 2019-04-19T05:40:39Z
dc.date.issued 2018
dc.identifier.citation Sadchenko, A., Kushnirenko, O. (2018). QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane. Electrical, Control and Communication Engineering, Vol. 14, N 2, p. 149–156. en
dc.identifier.citation Sadchenko, A. QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane / A. Sadchenko, O. Kushnirenko // Electrical, Control and Communication Engineering. - 2018. - Vol. 14, N 2. - P. 149-156. en
dc.identifier.issn 2255-9159 (online)
dc.identifier.issn 2255-9140 (print)
dc.identifier.uri doi: 10.2478/ecce-2018-0018
dc.identifier.uri https://www.content.sciendo.com
dc.identifier.uri http://dspace.opu.ua/jspui/handle/123456789/8416
dc.description.abstract In order to increase the efficiency of dedicated frequency channels, i.e. to increase the specific data transfer rate, multipositional quadrature phase shift keying (QPSK, aka 4-PSK) should be used. The problems with QPSK signal demodulation is a rotation of the signal constellation plane by an angle multiple of 90° and a slow response of the carrier oscillation recovery scheme. The study considers the existing methods for eliminating the phase ambiguity of the recovered carrier frequency in typical QPSK modems, and identifies the shortcoming of a low-speed response oscillation recovery circuit. The authors propose a QPSK demodulator circuit with a fast adjustment of the reference oscillator, which is due to the fact that no loop filter is used in the feedback and that a digital calculator of the required phase shift is used. An algorithm for the frame synchronization restoration with the simultaneous elimination of the phase ambiguity multiple of 90° was also developed using synthesized binary sequences with an ideal non-periodic autocorrelation function (NACF) at even shifts that do not have the rotary symmetry property. The phase ambiguity elimination algorithm proposed in the article can be used as an alternative to standard modems with differential coding. en
dc.language.iso en en
dc.subject Autocorrelation en
dc.subject Phase shift keying modems en
dc.subject Matched filters (MF) en
dc.subject Binary sequences en
dc.title QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane en
dc.type Article en
opu.kafedra Кафедра радіотехнічних систем uk
opu.citation.journal Electrical, Control and Communication Engineering en
opu.citation.volume vol. 14 en
opu.citation.firstpage 149 en
opu.citation.lastpage 156 en
opu.citation.issue no. 2, pp. 149–156 doi: 10.2478/ecce-2018-0018 en
opu.staff.id koa@opu.ua en


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