60GHz millimeter wave-based optical wireless fusion video transmission system and method

Abstract

The invention provides a 60GHz millimeter wave-based optical wireless fusion video transmission system and method. According to the system, at a junction center, a single-arm Mach-Zehnder intensity modulator is adopted to generate optical millimeter waves through an optical carrier suppression manner, wherein the frequency of the optical millimeter waves is twice of that of radio frequency signals; then, downlink baseband data signals, i.e. high-definition television data stored in a DVD (Digital Video Disk), are modulated to the optical millimeter waves by using another electro-optical Mach-Zehnder modulator; the downlink signals are transmitted to a base station unit through an optical fiber link, and 60GHz electrical millimeter waves are generated from optical-millimeter-wave signals by a high-speed photolectric transducer, are amplified, and then are sent out by an antenna; and the optical-millimeter-wave signals received through the antenna by a user unit are reconstructed into downlink video baseband data signals by using coherent demodulation. According to the system, the radio frequency signals with the frequency of 29GHz are adopted to generate the optical millimeter waves with the frequency of 58GHz, the video transmission rate is 500Mb / s, the transmission distance for data in a downlink in monomode optical fiber at the transmission rate of 500Mb / s is 200m, and the wireless transmission distance can reach 5m.

Description

technical field [0001] The invention relates to a system and method for optical wireless fusion video transmission based on 60GHz millimeter wave, which greatly improves the existing communication technology. Background technique [0002] With the rapid development of wireless access and mobile multimedia services, the user's capacity and demand for simultaneous language, high-definition image video and data services, as well as high-speed wireless communication are increasing day by day. One of the main development directions of future communication development. In recent years, the optical fiber wireless communication system with the optical millimeter wave as the core technology is a hot spot in the research of the next generation optical fiber communication. The optical-wireless fusion system can make full use of the characteristics that its optical fiber transmission section is not limited by bandwidth and combine the flexibility of wireless communication technology to...

AI Technical Summary

Problems solved by technology

The transmission distance is long, the attenuation is small, the anti-interference performance is the best, and it is suitable for long-distance transmission; optical fiber transmission also has the advantages of frequency bandwidth and large transmission capacity; but the cost of using optical fiber in access is high and its mobility is poor;

[0007] As a hot spot in the entire communication industry and even the information industry, the overall cost of wireless video transmission is the lowest. It only needs a one-time investment and does not need to dig trenches and bury pipes. It is especially suitable for places with long outdoor distances and decorations; in many cases, users Often due to the limitation of geographical environment and work content, such as special geographical environment such as mountains, ports and open land, it brings great inconvenience to the wiring engineering of wired network and wired transmission. The construction period of wired network will be very long, or even impossible. accomplish

At this time, the use of wireless video transmission can get rid of the shackles of cables, and has the advantages of short installation period, convenient maintenance, strong capacity expansion, and rapid cost recovery. However, in terms of the current development of wireless transmission technology, the first generation and second generation The data that can be transmitted by the first-generation mobile communication is only tens to more than one hundred thousand bits per second, and the data that can be transmitted by the third-generation mobile communication is only 2 megabits per second, which is far from meeting the requirements of broadband communication. In the future, the high-capacity and large-bandwidth requirements of high-definition video require the introduction of a new video transmission system and method.

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