A novel prototype wireless video transmission system was presented.The characteristic of the design was that the wireless terminal used high performance multimedia DSP as video processing and control core

and the interface board integrates various wireless network interfaces.By software control

not only the system could work in single net-work mode

but also could select appropriate transmission channel in multi-mode network environment

so as to present best video quality.The system configuration

hardware and software design

as well as the control policy of the wireless terminal were described in details.Experiments show that in the GPRS/WLAN and CDMA/WLAN test conditions

the system can select the proper network and present satisfactory reconstructed video.