What is the coverage of DMB-T? How to carry out DMB-T coverage planning?
Compared with the European DVB-T, the DMB-T of Tsinghua University can cover a larger area with the same power. Theoretical and experimental results show that the signal-to-noise ratio threshold of the DMB-T receiving end is more than 2dB lower than that of the European DVB-T system; DMB-T also has higher receiving sensitivity and faster receiving synchronization mechanism, close to the regional edge in the coverage area In areas where DVB-T is low due to low signal-to-noise ratio and field strength, DMB-T can still receive normally under the same conditions, which means a larger coverage area.
After setting up an optimized DMB-T single frequency network, multiple low-power transmitters can cover blind areas that cannot be covered by a single transmitter.
Coverage of terrestrial digital TV spread by radio signals, with broadcast transmission conditions (transmission antenna height and gain, transmission power), geographical environment (plain, mountainous, hilly, water distribution), actual building distribution (tall buildings) Density), planning coverage, etc. are closely related. Therefore, whether to build a single transmitting station to solve the coverage, or whether to build a single frequency network, as well as the size of the single frequency network and the layout plan of the transmitting site, the above factors must be considered comprehensively.
For testing including signal field strength, coverage planning, power optimization between single frequency network transmitter groups, etc.
For DMB-T system planning issues, it is recommended to ask a special unit to make a scientific plan. You can also refer to the European DVB-T
Systematic scientific planning.
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