Research On High And Low Speed Video Transmission Based On FPGA And WLAN

The commercialization of 5G communication technology and the popularization of intelligent tools have put forward higher requirements for data transmission and communication,which not only requires higher communication speed,but also ensures high reliability and stability in high-speed transmission.5G technology compresses network latency to the level of a few milliseconds,accelerating the development of some real-time high-speed transmission applications,such as remote video conferencing,remote surgical control and so on.In the process of high-speed real-time data transmission,the realization of low bit error rate to ensure the integrity of data transmission is also worthy of attention.In view of the difficulties of real-time data transmission in low bit error rate and high speed,a high-speed transmission mode based on FPGA board is designed.The data exchange between FPGA and PC adopts PCI Express 3.0 X8 specification protocol,and ten-gigabit fiber uses Aurora 64b/66b protocol for data transmission.Aiming at the current mainstream wireless network communication mode,a low-speed transmission mode based on nginx forwarding server in wireless LAN is designed.The data source of the two methods is the real-time video frame with 1080P resolution and 24FPS frame rate after decoding and decompressing by FFmpeg,and then the transmission delay of the real-time video frame is calculated by the host computer at the receiving end,so as to visually display the transmission effect of the two methods.Aiming at the influence of random noise and temperature rise of FPGA development board on the stability of high-speed transmission,in order to further verify that the designed FPGA ten-gigabit fiber high-speed transmission system can realize high-speed transmission and ensure low bit error rate to realize complete data transmission,four channels of ten-gigabit fiber communication are designed on the basis of single-channel ten-gigabit fiber communication.Four channel SFPs are reserved outside the FPGA board of the sending end and the FPGA cards of the four receiving ends are connected by ten-gigabit fiber,and multiple compressed files are randomly transmitted from the four channels of optical fiber to different hosts.By designing the host computer software for remote call test,the received compressed files were unzipped,and all the files were unzipped successfully,indicating that the data was not lost in the high-speed transmission.Finally,the transmission speeds of the 10,000-megabit optical fiber high-speed transmission mode designed by FPGA PCIE interface and the low-speed transmission mode of NGINX wireless LAN are tested respectively.The maximum transmission speed of the former is 600 MB/s,and the maximum transmission speed of the latter is 25 MB/s.FPGA optical fiber high-speed data transmission system can not only meet the requirements of high-speed transmission,but also ensure the integrity of data transmission after testing.The speed and efficiency are better than traditional WLAN.FPGA communication mode also has great research value in the future ultra-high speed data transmission.