Multi-carrier communication system using ciphered carrier bit as

Details Multi-carrier communication system using ciphered carrier bit as Multi-carrier communication system using ciphered carrier bit as

1991-05-14

1993-07-06

Cain, David

Cryptography

Communication system using cryptography

Wireless communication

342381, 379 98, H04K 110

Patent

active

052260810

ABSTRACT:
A multi-carrier communication system wherein a sender side apparatus and a receiver side apparatus are connected through a transmission line. The sender side apparatus contains a multi-carrier modulator for modulating data, where preset numbers of bits of the data are respectively modulated with a plurality of carriers in each cycle. The sender side apparatus transmits a training signal which is modulated by the multi-carrier modulating unit where the numbers are set equal to a predetermined maximum of the numbers, to the receiver side apparatus. The receiver side apparatus evaluates the quality of components of the training signal where the components are modulated with the respective carriers to determine the above numbers to be preset, ciphers information on the numbers, and transmits the ciphered information to the sender side apparatus. The sender side apparatus deciphers the information to obtain the determined numbers, and presets the numbers in a multi-carrier demodulator which is provided therein.

REFERENCES:
patent: 3898566 (1975-08-01), Switzer et al.
patent: 4438511 (1984-03-01), Baran
patent: 4679227 (1987-07-01), Hughes-Hartogs
patent: 4731816 (1988-03-01), Hughes-Hartogs
patent: 4757495 (1988-07-01), Decker et al.
patent: 4833706 (1989-05-01), Hughes-Hartogs
patent: 4893350 (1990-01-01), Minamisono et al.
Bingham, "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come" IEEE Communications Magazine May 1990, pp. 5-14.

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