LOW E//B/N//0 OFFSET QPSK BURST DEMODULATOR USING REVERSE MODULATION SCHEME.

Masahiro Umehira, Shuuzou Kato

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

An OQPSK (offset quadrature phase shift keying) burst demodulator using a reverse modulation scheme for low E//b/N//0 operation is described. A carrier-recovery circuit using a reverse modulation scheme for OQPSK signals is analyzed, and its performance is clarified. A novel binary transmit-receive code for OQPSK burst signals is proposed to reduce the recovered carrier phase error. To additionally reduce the recovered carrier phase error, a digitally controlled tracking filter is proposed, and an automatic frequency control LSI has been developed for the tracking filter. Experimental results show that a prototype 130-Mb/s OQPSK burst demodulator using a reverse modulation scheme works stably with low carrier cycle slipping rate even in a low E//b/N//0 environment.

Original languageEnglish
Pages (from-to)889-895
Number of pages7
JournalConference Record - International Conference on Communications
Publication statusPublished - 1987 Dec 1

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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