Digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with low error rate

Abstract

The invention relates to a digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system with a low error rate. The operating frequency of the system is a decimetric television frequency band ranging from 400 MHz to 800 MHz. The whole system is composed of a base station subsystem, a relay subsystem and a user-side subsystem. The base station subsystem comprises a broadband base station, an adjacent-frequency multiplex synthesis base station, an optical fiber base station, a bidirectional multimedia base station and a multiple-definition base station. The relay subsystem comprises a repeater relay station and a forward relay station. The user-side subsystem is composed of a user antenna, a digital set-top box, a digital television receiver and the like. The digital MUDS multi-channel decimetric adjacent-frequency radio television transmission system is low in manufacturing cost and capable of achieving transmission of multi-channel high-quality digital programs in a wireless mode and conducting dynamic pseudorandom descrambling and multiple secret key encryption and decryption on digital television signals to achieve charge management; as a result, a feasible, economical and practical means is provided for achieving modern multi-channel television coverage and multimedia coverage in suburban areas and rural areas, and mobile digital television transmission can also be achieved.

Description

technical field [0001] The invention belongs to a multi-channel television transmission system, in particular to a low bit error rate digital MUDS multi-channel decimeter wave adjacent frequency wireless television transmission system. Background technique [0002] Existing multi-channel television transmission systems include: cable TV transmission system, MMDS multi-channel microwave television transmission system (MMDS) and so on. Among them, the cable TV adjacent frequency transmission system has many transmission channels and good transmission effect. The disadvantage is that it needs wiring, high cost, heavy installation workload, poor resistance to natural and man-made damage, and heavy operation and maintenance workload. It is not suitable for solving urban suburbs and rural areas. The problem of multi-channel TV coverage of dispersed residents like that. The MMDS multi-channel microwave TV system adopts wireless coverage and is suitable for scattered residential ar...

AI Technical Summary

Problems solved by technology

Among them, the cable TV adjacent frequency transmission system has many transmission channels and good transmission effect. The disadvantage is that it needs wiring, high cost, heavy installation workload, poor resistance to natural and man-made damage, and heavy operation and maintenance workload. It is not suitable for solving urban suburbs and rural areas. Multi-channel TV coverage problem of dispersed residents

The MMDS multi-channel microwave TV system adopts wireless coverage, which is suitable for scattered residential areas. The disadvantage is that there is up- and down-conversion noise, which affects the viewing quality. Under the condition of digital TV, the impact is more serious; in addition, the relative bandwidth is small, and the adjacent frequency isolation is not good. High, short wavelength, tree attenuation, and rain attenuation are serious; MMDS multi-channel microwave TV transmission system cannot achieve high-quality coverage