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Article: Performance of a carrier-recovery loop in a satellite modem

TitlePerformance of a carrier-recovery loop in a satellite modem
Authors
Issue Date1991
PublisherInstitution of Engineering and Technology. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=2215
Citation
IEE Proceedings, Part I: Communications, Speech And Vision, 1991, v. 138 n. 1, p. 32-42 How to Cite?
AbstractThe paper describes a carrier recovery loop for the coherent demodulation of a digital satellite modem for mobile systems. The loop is data aided, employing decision feedback. The modem transmits a band-limited differentially encoded quaternary phase-shift-keyed (DEQPSK) signal over a satellite link. Several different earth stations are assumed to have simultaneous access to a given transponder, in an arrangement of frequency-division multiple access (FDMA). Thus the DEQPSK signals that occupy the immediately adjacent frequency bands can introduce adjacent-channel interference (ACI) into the transmitted DEQPSK signal. The high-power amplifier (HPA) at the earth station transmitter introduces AM-AM and AM-PM conversion effects into the DEQPSK signal, but the satellite transponder is linear. A baseband predistorter operates on the baseband signals at the input to the modulator and assumes a prior knowledge of the HPA characteristics. A carrier-recovery loop is used at the receiver to generate the in-phase and quadrature reference carriers employed by the coherent demodulator. The performance of the system is studied by computer simulation, over a range of different conditions and with different arrangements of the modem, and the results are used to determine the preferred modem design.
Persistent Identifierhttp://hdl.handle.net/10722/154939
ISSN

 

DC FieldValueLanguage
dc.contributor.authorCheung, SWen_US
dc.contributor.authorClark, APen_US
dc.date.accessioned2012-08-08T08:31:13Z-
dc.date.available2012-08-08T08:31:13Z-
dc.date.issued1991en_US
dc.identifier.citationIEE Proceedings, Part I: Communications, Speech And Vision, 1991, v. 138 n. 1, p. 32-42en_US
dc.identifier.issn0956-3776en_US
dc.identifier.urihttp://hdl.handle.net/10722/154939-
dc.description.abstractThe paper describes a carrier recovery loop for the coherent demodulation of a digital satellite modem for mobile systems. The loop is data aided, employing decision feedback. The modem transmits a band-limited differentially encoded quaternary phase-shift-keyed (DEQPSK) signal over a satellite link. Several different earth stations are assumed to have simultaneous access to a given transponder, in an arrangement of frequency-division multiple access (FDMA). Thus the DEQPSK signals that occupy the immediately adjacent frequency bands can introduce adjacent-channel interference (ACI) into the transmitted DEQPSK signal. The high-power amplifier (HPA) at the earth station transmitter introduces AM-AM and AM-PM conversion effects into the DEQPSK signal, but the satellite transponder is linear. A baseband predistorter operates on the baseband signals at the input to the modulator and assumes a prior knowledge of the HPA characteristics. A carrier-recovery loop is used at the receiver to generate the in-phase and quadrature reference carriers employed by the coherent demodulator. The performance of the system is studied by computer simulation, over a range of different conditions and with different arrangements of the modem, and the results are used to determine the preferred modem design.en_US
dc.languageengen_US
dc.publisherInstitution of Engineering and Technology. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=2215-
dc.relation.ispartofIEE Proceedings, Part I: Communications, Speech and Visionen_US
dc.titlePerformance of a carrier-recovery loop in a satellite modemen_US
dc.typeArticleen_US
dc.identifier.emailCheung, SW:swcheung@eee.hku.hken_US
dc.identifier.authorityCheung, SW=rp00102en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0026115054en_US
dc.identifier.hkuros208596-
dc.identifier.volume138en_US
dc.identifier.issue1en_US
dc.identifier.spage32en_US
dc.identifier.epage42en_US
dc.identifier.scopusauthoridCheung, SW=7202472784en_US
dc.identifier.scopusauthoridClark, AP=7404479647en_US

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