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Transmitter linearisation techniques for the 1.5-1.7 GHz MSAT bands

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationFifth International Conference on Radio Receivers and Associated Systems, Cambridge
Publisher or commissioning bodyInstitution of Electrical Engineers (IEE)
Publication dateJul 1990
Pages173 - 176
Number of pages4
ISBN (Print)0863417051
StatePublished

Conference

Conference5th International Conference on Radio Receivers and Associated Systems
CountryUnited Kingdom
CityCambridge
Period1/07/90 → …

Abstract

The two favoured modulation techniques for MSAT ACSSB and filtered QPSK, both exhibit a non-constant envelope, and thus require linear amplification to avoid undue spectral spreading into adjacent channels. Transmitter linearity is not easily achieved at these frequencies. The authors address this problem through the application of feedback control techniques to improve the linearity of the entire transmitter system incorporating the nonlinear amplifying element. It is shown that with appropriate choice of feedback structure, it is possible to improve the linearity of Class C amplifier stages to give superior performance to those of uncompensated Class A devices, thus greatly improving the transmitter power efficiency and reducing component cost

Additional information

Conference Proceedings/Title of Journal: Fifth International Conference on Radio Receivers and Associated Systems Rose publication type: Conference contribution Sponsorship: The authors wish to thank David Bennet for his invaluable help with the fabrication of the up- and down- converters and the loop phase shifter for the 1.7GHz system Other identifier: IEE Publ. No. 325

Research areas

  • mobile radio systems, radio transmitters, radiofrequency amplifiers, satellite relay systems

Event

5th International Conference on Radio Receivers and Associated Systems

Duration1 Jul 1990 → …
CountryUnited Kingdom
CityCambridge

Event: Conference

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