›› 2016, Vol. 36 ›› Issue (2): 13-.doi: 10.16708/j.cnki.1000-758X.2016.0021

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Anamplitudephasemeasurementmethodforbeamformingnetworkwithnonorthogonalcodes

 GAO  Yuan, AN  Jian-Ping, ZHOU  Hui, HAO  Shi-Guang, CHAI  Yuan   

  1. 1SchoolofInformationandElectronics,BeijingInstituteofTechnology,Beijing100081,China
    2InstituteofTelecommunicationSatellite,ChinaAcademyofSpaceTechnology,Beijing100094,China
  • Received:2015-07-17 Revised:2015-10-26 Online:2016-04-25 Published:2016-02-24

Abstract: Theapplicationofanamplitudeandphasemeasurementsystembasedonthespreadingcodesislimitedbytherequirementsofcodeorthogonality.Anamplitudephasemeasurementmethodfordigitalbeamformingnetworkbasedonnonorthogonalcodeswasproposedtoovercomethelimitation.Themainsourceoferrorsinthemeasurementsystemwithnonorthogonalcodeswasmultipleaccessinterference(MAI).Therefore,decorrelatingalgorithmwasproposedtosuppresstheMAIatthecostofincreasingthenoiseslightly.Theoreticalanalysisprovidedthetheorylowerboundoftheamplitudeandphasemeasurementandtheeffectofthesystemerrorandmutualcouplingonthemeasurementaccuracy.Simulationresultsdemonstratethattheaccuracyofthemeasurementsystemwithoutdecorrelatingalgorithmisunacceptable.However,theproposedmethodcansatisfytheaccuracyrequirementsof±01dBand±1degreeundertheconditionsthattheinbandsignaltonoiseratio(SNR)ishigherthan10dB.Moreover,thesimulationresultsareingoodagreementwiththoseoftheoreticalanalysis.

Key words: satellitecommunications, digitalbeamformingnetwork, amplitudephasemeasurement, nonorthogonalcodes, multipleaccessinterference, decorrelatingalgorithm