| 摘要 |
PURPOSE:To prevent an inter-code interference by multipath and to enable the high-quality and high-speed radio communication by sending a signal while changing the carrier wave frequency of a transmission signal so as to separate the direct wave and the delay wave and changing the band of passing the accepted signal at the time of reception. CONSTITUTION:A transmitter 1 gets a response on the propagation characteristic of a radio carrier path from a receiver 2. The transmitter 1 calculates the charp frequency interval and cycle based on the propagation characteristics of the accepted radio carrier path. The result of the charp frequency interval and the cycle is recorded on a memory. The transmitter 1 changes the carrier wave frequency of a transmission signal so as to separate the direct wave from the delay wave at the time of packet transmission based on the recorded result and send out the signal. On the other hand, the receiver 2 the pass band of the received signal is changed according to the change of the carrier wave frequency. The received signal is divided into the direct wave and the delay wave. Thus, the inter-code interference by the delay wave is reduced and the high-quality radio transmission is enabled. |
