Mobile television signal subway tunnel covering system based on leakage cable

Abstract

A mobile television underground tunnel covering system basing on the leaky cable comprises the following components: a low noise amplifier which is used for amplifying the signal source to the operational level necessary to an light transmitter; the light transmitter which is used for conveying the radio frequency signal outputted by the low noise amplifier; and a first optical coupler which is provided with at least one input end and a plurality of output ends and is used for distributing the optical power outputted by the light transmitter to a plurality of optical powers, and wherein the number of the output end can be set according to the actual need of the platform. A plurality of light receivers which are connected to the output ends of the first optical coupler through the optical fiber are used for conveying the light signal to the radio frequency signal. The leakage cable which is connected to the light receiver is used for transmitting the radio frequency signal. The invention settles the problem of interference between the signals with different frequencies. The transmission mode of combining the digital television direct-broadcasting station with the leaky cable is adopted and the cost for building the system is greatly reduced. The invention settles the problem of viewing mobile television in the underground and satisfies the requirement for the real-time information by the rail passenger.

Description

technical field [0001] The invention relates to wireless digital TV broadcasting technology, in particular to a terrestrial digital TV broadcasting signal covering system. Background technique [0002] With the rapid development of digital technology, the transmission technology of wireless radio and television is gradually developing from analog to digital, and the application services of wireless digital broadcast and television emerge in endlessly. Mobile TV is just one of the new applications in this field. Mobile TV adopts terrestrial digital TV broadcasting technology, transmits TV programs in real time through wireless digital signal transmission and terrestrial reception, supports mobile or fixed-point reception, and has stable signals and clear images. [0003] Mobile TV satisfies the needs of people to obtain information anytime and anywhere, continuously presenting news, entertainment, and service information to the public. In recent years, mobile TV has had a hu...

AI Technical Summary

Problems solved by technology

Since the current mobile TV signal coverage mainly relies on the coverage network composed of transmission points such as TV towers and broadcasting buildings, this network can only meet the requirements for outdoor reception, and mobile TV signals cannot be received normally in subways, tunnels and other environments

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