Title:
COMMUNICATION METHOD, TRANSMITTER AND RECEIVER
Document Type and Number:
Japanese Patent JP3724676
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent a signal sequence transmitted in other communication from being restored by multiplying an orthogonal matrix different for each communication to the signal sequence, transmitting it, multiplying the inverse matrix of the orthogonal matrix used on the transmission side of a communication party to a received signal sequence on a reception side and restoring the signal sequence before orthogonal transformation.
SOLUTION: A QPSK(quadrature phase shift keying) modulation circuit 11 converts transmission data S1 to the transmission signal sequence S2 of phase data and outputs it to the serial/parallel conversion circuit 14 of an orthogonal transformation part 12. The conversion circuit 14 converts the transmission signal sequence S2 to parallel signals and outputs them to an orthogonal transformation circuit 15. The orthogonal transformation circuit 15 executes the orthogonal transformation to the signal sequences ST1-STN and outputs parallel signal sequences to a parallel/serial conversion circuit 16. The conversion circuit 16 converts the signals into serial signal sequence S3 and outputs it to a transmission part 13. The transmission part 13 executes inverse Fourier transformation to it and transmits it through an antenna 19. On the reception side, it is restored to the signal sequence before the orthogonal transformation.
Inventors:
Suzuki Mihiro
Kazuyuki Sakoda
Kazuyuki Sakoda
Application Number:
JP5448697A
Publication Date:
December 07, 2005
Filing Date:
March 10, 1997
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04J11/00; H04L23/02; (IPC1-7): H04J11/00
Domestic Patent References:
| JP8018488A | ||||
| JP5227125A | ||||
| JP8065273A | ||||
| JP7079477A |
Attorney, Agent or Firm:
Keiki Tanabe