Title:
DIGITAL COMMUNICATION METHOD AND DIGITAL COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/032335
Kind Code:
A1
Abstract:
A digital communication device includes: a modulator having encoding means for converting two-dimensional digital information signal into a three-dimensional signal and phase modulation means for modifying the carrier phase in according to the three-dimensional signal; and a demodulator having phase demodulation means for detecting information on the three-dimensional signal from the received phase-modulated wave and demodulation means for deciding the two-dimensional digital information from the information on the three-dimensional signal. The digital communication device has a bit error ratio and an occupied radio band width equivalent to a digital communication device using the conventional QPSK or &pgr /4 shift QPSK and the error correction method and greatly improves the amplitude fluctuation. Moreover, the digital communication device can transmit a signal with a narrower occupied frequency band width while maintaining the same constant envelope characteristic as the GMSK using the conventional error correction code.
Inventors:
NAKAMURA MAKOTO (JP)
Application Number:
PCT/JP2003/012675
Publication Date:
April 15, 2004
Filing Date:
October 02, 2003
Export Citation:
Assignee:
YOKOHAMA TLO COMPANY LTD (JP)
NAKAMURA MAKOTO (JP)
NAKAMURA MAKOTO (JP)
International Classes:
H03M7/06; H03M13/21; H03M13/23; H03M13/25; H04L1/00; H04L1/24; H04L25/49; H04L27/20; H04L27/233; H04L27/28; (IPC1-7): H03M13/25; H04L27/18
Foreign References:
| JP2003209493A | 2003-07-25 | |||
| JP2003143249A | 2003-05-16 | |||
| JP2003110644A | 2003-04-11 | |||
| JP2000196690A | 2000-07-14 |
Other References:
See also references of EP 1551103A4
Attorney, Agent or Firm:
Shionoiri, Akio (1-4 Kugenuma-Tachibana 1-chom, Fujisawa-shi Kanagawa, JP)
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