Research On Key Technologies Of Multi-channel Real-time Video Transmission System

The development of mobile communications has brought us a lot of convenience. Andreal-time video transmission system will be more popular than before. But the loss of data isdue to time-delay in the real-time video transmission system, and the bandwidth of thereal-time video transmission system is limited. So real-time video transmission business is notyet well developed. While the multi-channel technology can effectively increase thebandwidth of real-time video transmission system, and reduce time-delay of real-time videotransmission system. So the key technologies of the multi-channel real-time videotransmission have an important significance in the development of video business.First, the development status and related technologies of real-time video transmissionhave been analyzed. Then the key technologies of the real-time video transmission have beenresearched. It should be noted that multi-channel technology can not be well applied toreal-time video transmission system, because the synchronization of the sending device andreceiving device, multiple channel scheduling and other problem exist.Secondly, the feasible solutions are proposed in order to solve the problems ofmulti-channel applications. Further, the packet algorithms and scheduling algorithms inreal-time video transmission system have been improved, and the realization of the twoalgorithms have been described in this paper.Finally, the hardware and software verification platform have been built respectivelyaccording to the requirements of real-time video transmission system. And the two platformsin details have been introduced. The hardware system based on FPGA mainly consists of fourparts: the video capture module, the data packet transmission module, the image recoverymodule, the display module. The video signal has been collected by the OV7670cameramodule, and it has been enclosed in a package. Next, it has been solved by the CRC andtransmitted through multiple terminal modules. After receiving data of the receiving device,the image has been restored by the CRC and sequence. Finally, the images have beendisplayed on a VGA monitor. Based on the software verification platform, the smooth videocan be got, when the transmission rate is no more than30fps in the multi-channel real-timevideo transmission system; while the efficiency of scheduling system is not perfect for thereason of large quantities of video signal data in hardware verification system. And the related technical remains to be improved and enhanced.