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Patent Searching and Data


Title:
COMMUNICATION DEVICE, COMMUNICATION METHOD, COMMUNICATION PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2007/102415
Kind Code:
A1
Abstract:
A communication device capable of generating a transmission signal to another station as a desired signal without measuring the delay time caused by the round-trip propagation to the satellite. The communication device comprises a replica signal generating means (a first demodulating section (3), a binarizing section (4), a demodulator (5), and filter (8)) generates a replica signal as a replica of the outbound signal by using the difference ( ) of the power density between the outbound signal and the inbound signal and by demodulating the outbound signal as an unwanted signal, a signal delay section (7) for generating a delay superimposition signal by delaying the superimposition signal by a time necessary for the replica signal generating section to generate the replica signal, and a signal cancel section (8) for canceling the unwanted replica signal generated by the replica signal generating signal from the delay superimposition signal. Thus, the measurement of the delay time is unnecessary.

Inventors:
OKADA MINORU
HARA TAKAO
KOBASHI HIROYUKI
OSATO MAYUMI
ANDO KIYOTAKE
Application Number:
PCT/JP2007/054002
Publication Date:
September 13, 2007
Filing Date:
March 02, 2007
Export Citation:
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Assignee:
NAT UNIV CORP NARA INST (JP)
JSAT CORP (JP)
OKADA MINORU
HARA TAKAO
KOBASHI HIROYUKI
OSATO MAYUMI
ANDO KIYOTAKE
International Classes:
H04B7/155
Foreign References:
Other References:
HARA T. ET AL.: "VSAT Eisei Tsushin ni Okeru Shuhasu Sairiyo Carrier Chojo Hoshiki to Shingo Canceller no Sekkei (Canceller Design for Carrier Super-Positioning Frequency Re-use of VSAT Satellite Communications)", THE TRANSACTIONS OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS B, vol. J88-B, no. 7, 1 July 2005 (2005-07-01), pages 1300 - 1309, XP003017670
ICHIKAWA M. ET AL.: "Fast and accurate canceller on carrier super-positioning for VSAT frequency re-use", 2005 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, vol. 3, 13 March 2005 (2005-03-13), pages 1479 - 1484, XP010791395
OSATO M. ET AL.: "Kan-i na Replica Seiseiho ni yoru VSAT Shingo Chojo Hoshiki (VSAT Frequency Super-Positioning by Simplified Replica Generation)", 2006 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SOGO TAIKAI KOEN RONBUNSHU, COMMUNICATION 1, 8 March 2006 (2006-03-08), pages 289, XP003017671
KOBASHI H. ET AL.: "Signal Cancellation for Satellite Frequency Reuse by Carrier Super-Positioning Multi-level Modulation", 11TH IEEE SYMPOSIUM ON COMPUTERS AND COMMUNICATIONS, 2006. ISCC '06. PROCEEDINGS, 26 June 2006 (2006-06-26), pages 1025 - 1030, XP010939259
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (2-6 Tenjinbashi 2-chome Kita, Kita-k, Osaka-shi Osaka 41, JP)
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