Title:
SPREAD SPECTRUM COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP2674726
Kind Code:
B2
Abstract:
PURPOSE: To enhance ciphering performance of information by sending an element for disturbing signal transmission in precedence over an element for information transmission.
CONSTITUTION: A transmission system 1A is provided with a transmission system for disturbing wave transmission in addition to a basic transmission for information transmission, and the transmission system 21A for disturbing wave transmission has a disturbing coding section 5A generating, e.g., a disturbance transmission frequency hopping pattern different from a frequency hopping pattern generated from a coding section 5 acting like a master section in the information transmission system and generates the disturbance transmission frequency hopping pattern in precedence over an element for information transmission. Then an information transmission wave is transmitted by an antenna 6A and a disturbance transmission wave being outputs of a spread spectrum modulation section 4 and a disturbance spread spectrum modulation section 4A. Thus, an AGC of a receiver of a 3rd party causes an invalid time from the reply for a period of the precedence disturbance to the restoration to a demodulation enable state.
Inventors:
Toshikazu Kawakami
Application Number:
JP21101692A
Publication Date:
November 12, 1997
Filing Date:
July 14, 1992
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04B1/713; H04B1/7143; H04J13/00; (IPC1-7): H04B1/713
Domestic Patent References:
| JP2309834A | ||||
| JP6448545A |
Attorney, Agent or Firm:
Kenichi Hayase
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