| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication system which can shorten a communication time. <P>SOLUTION: The system comprises two or more communication devices 12 and 13 which scan a plurality of predetermined channels; and the communication device 12 transmits a transmit signal having an information part including data after transmitting a preamble part including a bit synchronizing signal, a frame synchronizing signal, and opposite-party information repeatedly N times by using one of the plurality of channels, the communication device 13 recognizes that the signal is addressed to itself from opposite-party information included in the transmit signal, and then the communication devices 12 and 13 perform specified communication with each other by using only the channel used for the communication of the transmit signal. Consequently, when the frequency of communication becomes large, the frequency of repetition of the preamble signal is decreased to shorten the communication time for efficient communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
