The Research Of Shortwave Modem With High Reliability

Shortwave modem is the key part of shortwave digital communication system, and its capability decides the reliablity and data transfering speed. The shortwave modem used in our army now has low transferring speed, reliablity and low intelligentization, so it cann't adapt the shortwave channel. To produce steady and reliable shortwave modem becomes the key factor of realizing reliable and high-speed shortwave digital communication.The thesis put forwards the scheme of high-reliability shortwave modem to enhance intelligentization. So as to enhance reliality, the scheme adopts advanced ARQ agreement , frequency-self-adapt, speed-self-adapt, datalength-self-adpt and data supervention technology. These technologies would enhance the efficiency of data transfer and enhance the intelligentization of system.The scheme use software to realizes the main system functions and guarantees the reliability of the system.