Adjacent channel power and error-vector magnitude performance of reduced complexity CALLUM systems

D Jennings, A Bateman, JP McGeehan

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

The combined analogue locked-loop universal modulator (CALLUM) is a power efficient linear RF transmitter based on the LINC principle (linear amplification with nonlinear components). The system provides both upconversion and amplification of a baseband input signal, within a closed-loop control scheme. The variant known as CALLUM1 is optimal, but difficult to implement practically. Simplifications to this system can be made so that the processing requirement is reduced. The simulated performance of these systems is compared to that of CALLUM 1, in terms of adjacent channel power (ACP) and error-vector magnitude (EVMrms ), in response to a TETRA (terrestrial trunked radio) baseband modulation signal. The existing CALLUM systems and the simplified versions proposed in the paper meet the TETRA ACP specification of -60 dBc if enough stable loop gain can be provided
Translated title of the contributionAdjacent channel power and error-vector magnitude performance of reduced complexity CALLUM systems
Original languageEnglish
Article number5
Pages (from-to)297 - 302
JournalIEE Proceedings - Communications
Volume146
Issue number5
DOIs
Publication statusPublished - Oct 1999

Bibliographical note

Rose publication type: Journal article

Sponsorship: The work was funded by the Engineering and Physical Sciences Research Council (EPSRC)

Keywords

  • radiofrequency amplifiers
  • closed loop systems
  • quadrature phase shift keying

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