US 6,650,374 B2Granted

Digital television relay system

AssigneeLG Electronics Inc.

InventorsKwang-Joo Choi, Seong-Hwan Oh, Cheol Lee, Byung-Heon Lee

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Abstract

The present invention relates to a digital television relay system for relaying wirelessly a broadcasting signal discharged from a broadcasting station. In order to cover shadow areas of the digital broadcasting channel signal discharged from a digital television transmitter, the present invention receives the broadcasting channel signal of a certain frequency discharged from the broadcasting station, performs channel-decoding, compensates a transmission error occurred in space, and relays it wirelessly to a subscriber in the shadow areas. Accordingly, the present invention can provide a digital television broadcasting service with transmission quality same with the broadcasting station to the subscriber in the shadow areas.

Claims20

Dependent claims

A digital television relay system, comprises:

a front end unit for transmitting/receiving a certain broadcasting channel frequency signal;
a VSB demodulator unit for converting the certain broadcasting channel frequency signal received from the front end unit into intermediate frequency and performing channel decoding with a VSB method;
a VSB modulator unit for compensating a transmission error occurred on space about the signal channel-decoded on the VSB demodulator unit;
an exciter unit for up-converting the signal outputted from the VSB modulator unit into a transmission channel frequency allotted so as to be different from a reception channel frequency;
a power amplifying unit for amplifying power of the signal up-converted on the exciter unit;
a VSB corrector unit for yielding a compensation value in order to compensate a non-linear error of the signal outputted from the power amplifying unit and providing it to the VSB modulator unit;
and
a control unit for performing overall control of the digital television relay system.

5 more elements

A digital television relay system, comprising:

a front end unit for transmitting/receiving a certain broadcasting channel frequency signal;
a VSB demodulator unit for converting the certain broadcasting channel frequency signal received from the front end unit into intermediate frequency and performing channel decoding with a VSB method;
a VSB modulator unit for compensating a transmission error occurred on space about the signal channel-decoded on the VSB demodulator unit;
an exciter unit for up-converting the signal outputted from the VSB modulator unit into a transmission channel frequency allotted in advance so as to be different from a reception channel frequency;
a power amplifying unit for amplifying power of the signal up-converted on the exciter unit;
a VSB corrector unit for yielding a compensation value in order to compensate a non-linear error of the signal outputted from the power amplifying unit and providing it to the VSB modulator unit;
and
a control unit for performing overall control of the digital television relay system.

5 more elements

Dependencies are inferred from the claim text.