Digital television terrestrial broadcasting system and construction method thereof
A digital TV terrestrial and broadcasting system technology, applied in broadcasting transmission systems, broadcasting-related systems, broadcasting devices, etc., can solve the problems of high transmission power, difficult improvement, and inability to be covered, and achieve low selection requirements, small electromagnetic pollution, The effect of small pollution area
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[0034] In view of the problems existing in the prior art, the inventor proposes an idea of using low-power transmission to form a network. The invention is a technique for transmitting supplementary signals and networking with low power in a DTMB network. Design filter circuits to process electromagnetic waves in the air, control small insertion loss, filter out useful signals, and then design low-power transmitting equipment to realize low-power multi-point transmission within the guard interval that reflected signals can be received.
[0035] DTMB (Digital Television Terrestrial Multimedia Broadcasting) is the English abbreviation of Digital Television Terrestrial Multimedia Broadcasting. In the DTMB system, the time-domain synchronous Orthogonal Frequency Division Multiplexing (OFDM) modulation method is adopted to support data transmission within the 8MHZ bandwidth. OFDM adds a guard interval between each symbol in the subcarrier to reduce intersymbol interference and c...
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