QAM and QPRS digital broadband cable systems

K. Sreenath, Iwao Sasase, Iwao Sasase

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The performance of high-level modulation schemes in non-linear broadband digital communication systems is investigated. The tolerance of 16-, 64-, 256-QAM and 49-, 225-QPRS schemes to these non-linearities is given in terms of their phase margins. Our research results show that high level QAM schemes are less sensitive to non-linearities when operated in offset mode. Comparison of nonlinearly amplified broadband QAM and QPRS schemes reveals that QPRS schemes need less carrier-to-noise ratio (CNR) than corresponding QAM schemes for identical operating conditions. Also, when the non-linearities are not severe, the degradation in performance is controlled by AM/PM characteristic of the broadband amplifier.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalInternational Journal of Digital & Analog Cabled Systems
Volume2
Issue number3
Publication statusPublished - 1989 Jul
Externally publishedYes

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Quadrature amplitude modulation
Cables
Broadband amplifiers
Digital communication systems
Modulation
Degradation

ASJC Scopus subject areas

  • Engineering(all)

Cite this

QAM and QPRS digital broadband cable systems. / Sreenath, K.; Sasase, Iwao; Sasase, Iwao.

In: International Journal of Digital & Analog Cabled Systems, Vol. 2, No. 3, 07.1989, p. 139-148.

Research output: Contribution to journalArticle

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