Title:
MODULATION METHOD, MODULATION APPARATUS, DEMODULATION APPARATUS, AND RADIO COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2004/102912
Kind Code:
A1
Abstract:
First and second quadrature modulators (109,110) quadrature modulate Nyquist signals, which have been given delay differences of two and four times the symbol period, respectively, using, as a carrier, a cosine wave having a frequency that is an odd multiple of the basic frequency of Nyquist signal. A third quadrature modulator (113) quadrature modulates the modulated signals obtained by the first and second quadrature modulators (109,110), using a carrier having a predetermined frequency. In this way, a modulated signal can be obtained in which four Nyquist signals are arranged within a single symbol period (T) with no mutual interference.
Inventors:
OTA GENICHIRO
INOGAI KAZUNORI
INOGAI KAZUNORI
Application Number:
PCT/JP2004/006860
Publication Date:
November 25, 2004
Filing Date:
May 14, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
OTA GENICHIRO
INOGAI KAZUNORI
OTA GENICHIRO
INOGAI KAZUNORI
International Classes:
H04B14/02; H04L27/18; (IPC1-7): H04L27/18; H04B14/02
Foreign References:
| JPH08149169A | 1996-06-07 | |||
| JPH04177946A | 1992-06-25 | |||
| JPH04501042A | 1992-02-20 |
Other References:
SAHA D. AND BIRDSALL T.G.: "QUADRATURE-QUADRATURE PHASE-SHIFT KEYING", IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 37, no. 5, May 1989 (1989-05-01), pages 437 - 448, XP000054268
Attorney, Agent or Firm:
Washida, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki 1-chom, Tama-shi Tokyo 34, JP)
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