A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals

Tetsu SAKATA; Kazuhiko SEKI; Shuji KUBOTA; Shuzo KATO

A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals

Tetsu SAKATA, Kazuhiko SEKI, Shuji KUBOTA, Shuzo KATO

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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.

Publication: IEICE TRANSACTIONS on Communications Vol.E77-B No.7 pp.921-926

Publication Date: 1994/07/25

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Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)

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Tetsu SAKATA, Kazuhiko SEKI, Shuji KUBOTA, Shuzo KATO, "A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals" in IEICE TRANSACTIONS on Communications, vol. E77-B, no. 7, pp. 921-926, July 1994, doi: .
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.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e77-b_7_921/_p

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@ARTICLE{e77-b_7_921,
author={Tetsu SAKATA, Kazuhiko SEKI, Shuji KUBOTA, Shuzo KATO, },
journal={IEICE TRANSACTIONS on Communications},
title={A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals},
year={1994},
volume={E77-B},
number={7},
pages={921-926},
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.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - A New Fully-Digitalized π/4-Shift QPSK Modulator for Personal Communication Terminals
T2 - IEICE TRANSACTIONS on Communications
SP - 921
EP - 926
AU - Tetsu SAKATA
AU - Kazuhiko SEKI
AU - Shuji KUBOTA
AU - Shuzo KATO
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E77-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 1994
AB - 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.
ER -