New fully-digitalized π/4-shift QPSK modulator for personal communication terminals

Tetsu Sakata, Kazuhiko Seki, Shuji Kubota, Shuzo Kato

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper proposes a new fully-digitalized π/4-shift QPSK modulator consisting of a digital pulse shaping filter and a baseband quadrature modulator. By employing a novel digital filter configuration, the required filter memory is reduced to just 6.25% of the conventional one. Moreover, since the proposed baseband modulation scheme does not employ analog mixers or an analog 90° divider, a very accurate, high-stable and compact modulator is realized. It is shown that the proposed scheme achieves excellent low power consumption characteristics and is more suitable for digital LSIC implementation of personal communication terminals than a direct RF modulation scheme and an analog IF modulation scheme.

Original languageEnglish
Pages (from-to)921-926
Number of pages6
JournalIEICE Transactions on Communications
VolumeE77-B
Issue number7
Publication statusPublished - 1994 Jul
Externally publishedYes

Fingerprint

Cellular telephone systems
Quadrature phase shift keying
Modulators
Modulation
Pulse shaping
Mixer circuits
Digital filters
Electric power utilization
Data storage equipment

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

New fully-digitalized π/4-shift QPSK modulator for personal communication terminals. / Sakata, Tetsu; Seki, Kazuhiko; Kubota, Shuji; Kato, Shuzo.

In: IEICE Transactions on Communications, Vol. E77-B, No. 7, 07.1994, p. 921-926.

Research output: Contribution to journalArticle

Sakata, Tetsu ; Seki, Kazuhiko ; Kubota, Shuji ; Kato, Shuzo. / New fully-digitalized π/4-shift QPSK modulator for personal communication terminals. In: IEICE Transactions on Communications. 1994 ; Vol. E77-B, No. 7. pp. 921-926.
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