A high speed QPSK/OQPSK digital burst modem for LSIC implementation

Kazuhlko Seki, Yoichl Matsumoto, Klyoshi Kobayashi, Tetsu Sakata, Masahiro Morikura, Shuji Kubota, Shuzo Kato

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


This paper proposes a high speed QPSK/OQPSK digital burst modem which employs a reverse modulation carrier recovery scheme to recover high speed burst mode signals in low Eb/No environment. The proposed all digital high speed burst modem achieves both high speed carrier recovery and very low carrier slipping performances simultaneously which other methods cannot achieve. To achieve these performances, a carrier recovery circuit with a wave forming filter for reverse modulation of OQPSK signal is proposed to reduce operation speed and still to keep the same carrier signal-to-noise ratio, in addition, an interpolation scheme with a pulse shape filter for bit timing recovery to avoid analogue VCO and to reduce overhead for bit timing recovery. Computer simulation results show that the proposed demodulator achieves high speed carrier acquisition and a low carrier slipping rate enough to meet the required value, 1.0×10-8 event/symbol at an Eb/No of 4.1dB with negligible small bit error rate degradation. The proposed modem can be implemented in all-digital circuits and suitable for LSIC implementation.

Original languageEnglish
Title of host publicationGLOBECOM 1992 - Communication for Global Users
Subtitle of host publicationIEEE Global Telecommunications Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)0780306082, 9780780306080
Publication statusPublished - 1992
Externally publishedYes
Event1992 IEEE Global Telecommunications Conference: Communication for Global Users, GLOBECOM 1992 - Orlando, United States
Duration: 1992 Dec 61992 Dec 9

Publication series

NameGLOBECOM 1992 - Communication for Global Users: IEEE Global Telecommunications Conference


Conference1992 IEEE Global Telecommunications Conference: Communication for Global Users, GLOBECOM 1992
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality


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