Optical Fiber Indoor Distribution System for Mobile Multimedia Broadcasting

Abstract

The invention discloses a mobile multimedia broadcasting optical fiber indoor distribution system which comprises a receiving antenna, an optic-fiber repeater near-end machine, an optical power distribution device, an optical receiving terminal and a transmitting antenna. The receiving antenna is connected with the optic-fiber repeater near-end machine; the optic-fiber repeater near-end machine is connected with the optical power distribution device; the optical power distribution device is connected with the optical receiving terminal; the optical receiving terminal is connected with the transmitting antenna; the receiving antenna is used for receiving mobile multimedia broadcasting signals in the sky; the optic-fiber repeater near-end machine is used for filtering and amplifying mobile multimedia broadcasting radio-frequency signals and converting the signals into optical signals; the optical power distribution device is used for distributing the optical signals in corresponding proportion; the optical receiving terminal is used for converting the optical signals into radio-frequency signals and amplifying the radio-frequency signals; the transmitting antenna is used for transmitting the radio-frequency signals to the sky; and the mobile multimedia broadcasting signals are uniaxially transmitted. The system has the advantages of low transmission loss, low cost and convenience in cabling construction.

Description

technical field [0001] The invention relates to the technical field of mobile multimedia broadcasting, in particular to a mobile multimedia broadcasting optical fiber indoor distribution system. Background technique [0002] CMMB is the abbreviation of China Mobile Multimedia Broadcasting in English, which means China Mobile Multimedia Broadcasting. CMMB mainly provides broadcast and TV services for small-screen portable handheld terminals such as mobile phones and PDAs, and vehicle-mounted TVs. [0003] Mobile Multimedia Broadcasting CMMB is a broadcast mobile TV standard formulated by China itself. At present, its signal coverage method is mainly to carry out large-scale outdoor coverage through the transmitting base station, and to carry out indoor deep coverage through the radio frequency passive distribution method of the repeater. [0004] The radio frequency passive distribution mode of the repeater receives the CMMB signal in the air through the directional donor a...

AI Technical Summary

Problems solved by technology

[0007] 1) High engineering cost

In order to overcome the loss of coaxial cable transmission and consider cost factors and convenient construction, low-loss 1 / 2 corrugated copper tube coaxial cables are mostly used for indoor distribution, and the cost per meter is as high as 10 yuan, while the RF passive distribution system is A large number of coaxial cables are required, which makes the cost of coaxial cables account for a high proportion of the total project cost, usually as high as 30%, resulting in high project cost

[0008] 2) Need larger repeater or increase dry put

Therefore, it is necessary to use a higher power repeater or increase the dry amplifier to compensate for this loss, which increases the cost of the equipment

[0009] 3) Inconvenient construction

The 1 / 2 corrugated copper tube coaxial cable has an outer diameter of 15.8mm, and the minimum bending radius of ten times of repeated bending is 125 (mm). The bending radius is relatively large, which is inconvenient for wiring construction and affects the appearance

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