The specific application of spread spectrum radio communication to DA system for county level in south of the Changjiang river is introduced, as an example of spread spectrum radio communication system for Yushui district which is the first test in Jiangxi province, including contriving scheme, establishing relay station, installation and debugging.

However, there are still severe technical challenges in wireless video communications, because the error-prone and time-varying band-limited wireless channels always have difficulty in meeting the requirements for large-data-volume and high-service-quality video transmission.