| In the era of information,video communication has become a common method for us to communicate with each other.The current transmission method based on public network is suitable in living and working environment,and it has become mature through years of iteration.While in the field of security surveillance,where the data cannot be transmitted via public network,related technology has been barely developed,with much room for improvement in the quality of video,transmission distance and flexibility.To answer the request from a domestic security surveillance enterprise,the author designed a mobile wireless HD real-time transmission system,applicable in specific areas.It can be used in emergency rescue,urban operation or safety inspection and military reconnaissance,with strong practicability and social significance.To meet the demands,the author proposed the system specification based on video codec chip,DDR3,FPGA,MCU and integrated RF transceiver chip.The system schematic and 8-layer PCB were independently completed,solving a series of engineering problems,such as high density layout,signals isolation,and the signal integrity of high-speed circuit.Combined with the software design of programmable devices,the system managed to achieve 1080p HD video H.264 coding and decoding,MIMO-OFDM baseband signal processing and transmit-receive function of 2x2 RF.The test run results show that the system can transmit the HD video through wireless communication and display on the receiving end in real time.Compared with the existing technology,the system has advantages of portability,high video quality,long transmission distance,flexible interface,etc.It has a certain reference for the future development of wireless video transmission in the field of security surveillance. |
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