Title:
COMMUNICATIONS SYSTEM, TRANSMITTER, RECEIVER, PHASE SPREAD CODE GENERATING APPARATUS, TRANSMISSION METHOD, RECEPTION METHOD, PHASE SPREAD CODE GENERATION METHOD, AND PROGRAM
Document Type and Number:
Japanese Patent JP3799355
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a communications system or the like which carries out multiplex communication employing random numbers.
SOLUTION: A communication system 101 uses N (N≥3) sets of phase spread codes &phiv [0] to &phiv [N-1], a fundamental carrier signal c(ωt) having a prescribed bit width T, a prescribed angular frequency ω, a chip width C=T/N and a period of 2π/ω, and its correlation function d(η). A transmitter 102 uses a signal c(ωt+ψ[floor(t/C) mod N]), resulting from shifting the phase of the fundamental carrier signal c(ωt) for a carrier, modulates a bit signal with the bit width T and transmits the result. A receiver 103 demodulates the bit signal on the basis of the correlation value between the received signal and the product of the fundamental carrier signal c(ωt) and the d(ψ[floor(t/C) mod N]).
Inventors:
Akihiro Yamaguchi
Ken Umeno
Ken Umeno
Application Number:
JP2004006472A
Publication Date:
July 19, 2006
Filing Date:
January 14, 2004
Export Citation:
Assignee:
Japan Science and Technology Agency
Akihiro Yamaguchi
Ken Umeno
Akihiro Yamaguchi
Ken Umeno
International Classes:
H03K3/84; H04B1/707; H04J13/10; (IPC1-7): H04B1/707; H03K3/84
Domestic Patent References:
| JP2003110503A | ||||
| JP2002290274A | ||||
| JP2003338775A |
Attorney, Agent or Firm:
Kimura Mitsuru
Yuichiro Ishii
Yuichiro Ishii