Data transmitting device, and system and method for radio communication

Abstract

Before a secret information is transmitted, a signal transmission and reception is performed between a first radio station on the secret information transmitting side and a second radio station on the secret information receiving side, thereby estimating a radio propagation path environment shared only by the first and second radio stations. Then, the secret information is transmitted from the first radio station to the second radio station with the foregoing radio propagation path environment taken into account.

Description

[0001] This application is the result of a patent application with an application date of August 30, 2001, an international application number of PCT / JP01 / 07454, a Chinese national application number of 01803405.5, and an invention title of "data transmission device, radio communication system and radio communication method". Divisional application. technical field [0002] The present invention relates to a data transmission device, a radio communication system and a radio communication method for transmitting confidential information to a specific radio station through a radio line. Background technique [0003] In recent years, digital radio communication has taken an important place in the communication field due to its rapid improvement in transmission speed and transmission quality. On the other hand, in radio communication, since the radio wave space which is a public resource is used, there is an inherent defect that it may be received by a third party in terms of co...

AI Technical Summary

Problems solved by technology

Especially when encryption keys and encrypted information are transmitted over wireless lines as described above, the danger is greater

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