Class-IV PRS above the Nyquist rate

Kuang Tsan Wu, Iwao Sasase, Kamilo Feher

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


An improved efficiency technique for class-IV (modified duobinary) partial-response signalling (PRS) above the Nyquist rate transmission is described. Computer simulations and hardware measurements for a base-band seven-level class-IV PRS system using this technique are shown in good agreement. It is then demonstrated by computer simulations that, with the use of this technique for class-IV 225-QPRS (quadrature PRS), an increase of 4% or more above the Nyquist rate, i.e., a spectral efficiency of 6.24 b/s/Hz or higher, can be achieved by simple symbol-by-symbol detection with a small degradation. It is further shown that the advantages of combining this technique with class-IV PRS are that a small bandwidth around DC can be carved out for the use of a service channel and that an even higher increase in spectral efficiency can be obtained in an FDM SSB system.

Original languageEnglish
Pages (from-to)183-191
Number of pages9
JournalIEE Proceedings F: Communications Radar and Signal Processing
Issue number2
Publication statusPublished - 1988 Sept 1


  • Computer simulation
  • Digital communication systems
  • Modulation

ASJC Scopus subject areas

  • Signal Processing
  • Engineering(all)


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