Brief Introduction to coofdm Wireless Video Transmission Technology

The development of wireless technology has led to a wide variety of technical applications. Of course, video is essential. Next, we will introduce a wireless video transmission technology called coofdm. I hope this article can broaden your horizons.

Coofdm Wireless Video Transmission Technology is a multi-carrier Digital Communication modulation technology used in military radio transmission, which features high spectrum utilization and can defend against the extension of multi-path latency, it is also a relatively complete mobile receiving and transmission technology.

Currently, most wireless video transmission technologies on the market use GPRS and CDMA technologies. However, due to insufficient bandwidth for GPRS transmission, the video is transmitted only several frames per second. In case of emergency events, breakpoints and wireless reception are prone to dead ends. CDMA Transmission also has such a defect: the downstream bandwidth is 153 KB, And the upstream bandwidth is 70 KB ~ Therefore, it is basically impossible to transmit smooth videos. Because the image only has a few frames, it is transmitted as a captured image and is of a small image size. Obviously, the application of this technology cannot meet the actual application requirements of the video surveillance system of Ping An City.

Other high-bandwidth wireless transmission solutions for Microwave Digital Microwave, spread-spectrum microwave), wireless LAN802.11 (B), 802.11 (g), 802.11 (a), and other technologies, the implementation of video compression encoding in MPEG-2/4, H. 264. Among them, high quality image resolution 720 × 576) is generally MPEG-2 codec majority, some adopt wavelet codec. However, most of them share the same disadvantage, that is, they can only achieve visual transmission and targeted transmission, and it is difficult to support mobile transmission, thus limiting its application in the video monitoring system. Coofdm Wireless Video Transmission Technology can overcome this shortcoming. Its practical value is that it breaks through the line of sight restriction, has good immunity to noise and interference, and can diffraction and penetrate the shelter.

Coofdm technology can separate multiple digital signals at the same time and operate securely around interference signals. It can continuously monitor the sudden changes in communication characteristics on the transmission media, and its communication path data transmission capability will change over time, and coofdm can dynamically adapt to it, connect and disconnect the corresponding carrier to ensure continuous successful communication. Therefore, coofdm technology is particularly suitable for cities with high-rise buildings, densely populated and geographically prominent areas, as well as areas where signals are cast and high-speed data transmission. It can meet the needs of users in places such as fire control, public security, border defense, forest fire prevention, coal mine monitoring, civil air defense emergency, urban management law enforcement, and bank escort.

Wireless Video Transmission Technology is flexible and can make up for the shortcomings of wired networks, so it is suitable for the security construction of safe city. In fact, real-time Wireless Video Transmission involves two main concepts: Mobile transmission and broadband transmission.

Therefore, to develop a wireless video transmission system that can transmit high-definition videos with a wide frequency in the high-speed mobile process, two main problems need to be solved: 1. Echo interference caused by multi-path propagation; 2. frequency resource utilization and gradual saturation. In the past, wireless video image transmission mainly focused on one-way analog television broadcasting. a TV program uses a single frequency, but when the same frequency is used to launch and broadcast TV programs in different locations, there will be mutual interference between them.

In addition, because the receiving or transmitting Party is in the moving status, both the transmitting and receiving parties will encounter a strong multi-path interference, that is, Echo interference. Therefore, the echo interference processing method may fundamentally affect the performance of a real-time wireless High Definition Video Transmission System. Coofdm wireless video transmission technology can effectively use the echo instead of passively eliminating the problems caused by the echo. It can achieve fixed-mobile, mobile-mobile wireless video transmission. Therefore, in the urban environment, coofdm wireless video transmission technology is particularly suitable for solving the modern urban environment where the skyscraper is full of buildings today, and especially suitable for the application of safe city construction. The following describes the working principle, system composition, features, and application of coofdm Wireless Video Transmission Technology in video surveillance.