| 摘要 |
<P>PROBLEM TO BE SOLVED: To certainly detect a spectrum-diffusion-modulated train detection signal by a receiving part and to enhance transmission efficiency. <P>SOLUTION: A PN code generated in a receiver 2a is fed to a diffusion recovery part 14 according to an output of a matching filter 12 for generating an output signal at each one period of a diffusion code transmitted by a transmitter from a received signal wave, and the received wave is diffusion-modulated by using the same PN code as the transmitter 1a. Thereby, the train detection signal transmitted from the transmitter 1a is certainly detected by the receiver 2a and a time required for synchronous capturing is shortened to enhance transmission efficiency. <P>COPYRIGHT: (C)2007,JPO&INPIT |
