Title:
MOBILE STATION, BASE STATION, COMMUNICATION SYSTEM AND COMMUNICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2007/083544
Kind Code:
A1
Abstract:
A communication system is provided with a plurality of mobile stations and a base
station. A mobile station makes a pilot channel composed of a Cassak code correspond
to a signal having a plurality of frequency components in a predetermined band
disposed in parallel with each other in a constant distance. A mobile station
transmits a transmission signal including such a signal in accordance with a
scheduling signal. The mobile station also makes its own transmission signal
correspond to transmission signals of other mobile stations using different
bands from a band of that own transmission signal in order for the former to be orthogonal
with the latter on a frequency axis. A base station calculates a difference between
a receiving signal and a replica of the pilot channel to infer a channel. The base
station decodes the receiving signal by using a channel inference result. The
replica of the pilot signal is generated by corresponding the pilot channel composed
of the Cassac code to the predetermined band disposed in parallel with each other
at the constant distance.
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Inventors:
KAWAMURA TERUO (JP)
KISHIYAMA YOSHIHISA (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
KISHIYAMA YOSHIHISA (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
Application Number:
PCT/JP2007/050150
Publication Date:
July 26, 2007
Filing Date:
January 10, 2007
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
KAWAMURA TERUO (JP)
KISHIYAMA YOSHIHISA (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
KAWAMURA TERUO (JP)
KISHIYAMA YOSHIHISA (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
International Classes:
H04B1/707; H04W76/02; H04J1/00; H04J13/18; H04W72/04; H04W76/00
Foreign References:
| JPH10233713A | 1998-09-02 |
Other References:
CARNI E. ET AL.: "Synchronous CDMA Based on the Cyclical Translations of a CAZAC Sequence", PROCEEDINGS OF THE IEEE 2ND INTERNATIONAL SYMPOSIUM ON WIRELESS COMMUNICATION SYSTEMS, 5 September 2005 (2005-09-05), pages 442 - 446, XP010886290
BAUM K.L. ET AL.: "Cyclic-Prefix CDMA: An Improved Transmission Method for Broadband DS-CDMA Cellular Systems", PROCEEDINGS OF THE IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, vol. 1, 17 March 2002 (2002-03-17), pages 183 - 188, XP010585759
See also references of EP 1976137A4
BAUM K.L. ET AL.: "Cyclic-Prefix CDMA: An Improved Transmission Method for Broadband DS-CDMA Cellular Systems", PROCEEDINGS OF THE IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, vol. 1, 17 March 2002 (2002-03-17), pages 183 - 188, XP010585759
See also references of EP 1976137A4
Attorney, Agent or Firm:
ITOH, Tadahiko (Yebisu Garden Place Tower 20-3, Ebisu 4-Chom, Shibuya-Ku Tokyo 32, JP)
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