DIGITAL BROADCASTING TRANSMISSION AND/OR RECEPTION SYSTEM TO IMPROVE RECEIVING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF
First Claim
1. A digital broadcast receiver configured to receive a signal from a digital transmitter, wherein the digital transmitter comprises a known data exchanger inserting known data at a certain position in data, an interleaver interleaving the data including the known data, a trellis encoder trellis encoding the interleaved data to an 8-level symbol at a rate of 2/3, and initializing a memory of the trellis encoder in a predetermined position of the interleaved known data, and a modulator performing a VSB modulation of the trellis encoded data, the digital broadcast receiver comprising:
- a demodulator performing a VSB demodulation of the received, modulated signal, the signal having the trellis encoded symbol corresponding to the known data, the known data being processed by the initialized trellis encoder of the transmitter; and
an equalizer removing an interference of the demodulated signal according to the trellis encoded symbol corresponding to the known data,wherein the known data is a predefined sequence known between the digital transmitter and the digital broadcast receiver.
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Abstract
A digital broadcasting transmission and/or reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a randomizer to input and randomize data streams including a plurality of segments having at least one segment having one or more null packets, a null packet exchanger to create known data having a predetermined pattern and to replace the null packets at positions of the segments having the null packets of the randomized data streams to insert the known ‘data, an encoder to encode the data streams to which the known data is inserted, and a modulation/RF unit to modulate, RF-modulate, and transmit the encoded data streams. A digital broadcasting receiver detects the known data’ from a signal received from the digital broadcasting transmitter and uses the detected known data for synchronization and equalization, so that a digital broadcasting reception performance of the digital broadcasting receiver can be improved at poor multipath channels.
124 Citations
20 Claims
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1. A digital broadcast receiver configured to receive a signal from a digital transmitter, wherein the digital transmitter comprises a known data exchanger inserting known data at a certain position in data, an interleaver interleaving the data including the known data, a trellis encoder trellis encoding the interleaved data to an 8-level symbol at a rate of 2/3, and initializing a memory of the trellis encoder in a predetermined position of the interleaved known data, and a modulator performing a VSB modulation of the trellis encoded data, the digital broadcast receiver comprising:
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a demodulator performing a VSB demodulation of the received, modulated signal, the signal having the trellis encoded symbol corresponding to the known data, the known data being processed by the initialized trellis encoder of the transmitter; and an equalizer removing an interference of the demodulated signal according to the trellis encoded symbol corresponding to the known data, wherein the known data is a predefined sequence known between the digital transmitter and the digital broadcast receiver.
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2. A digital broadcast receiver configured to receive a signal from a digital transmitter, wherein the digital transmitter comprises a known data exchanger inserting known data at a certain position in data, the known data being a predefined sequence known between the digital transmitter and the digital broadcast receiver, an interleaver interleaving the data including the known data, a trellis encoder trellis encoding the interleaved data to an 8-level symbol at a rate of 2/3, and initializing a memory of the trellis encoder in a predetermined position of the interleaved known data, and a modulator performing a VSB modulation of the trellis encoded data, the digital broadcast receiver comprising:
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a tuner configured to receive the signal transmitted by the digital transmitter, the signal having the trellis encoded symbol corresponding to the known data, the known data being processed by the initialized trellis encoder of the transmitter; a demodulator performing a VSB demodulation of the received signal, which was modulated by the modulator of the transmitter; and an equalizer removing an interference of the demodulated signal according to the trellis encoded symbol corresponding to the known data by compensating for a channel distortion of the demodulated signal due to a multi-path of a channel. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A signal processing method for a digital broadcast receiver receiving a signal from a digital transmitter that inserts known data at a certain position in data, the known data being a predefined sequence known between the digital transmitter and the digital broadcast receiver, interleaves the data including the known data, and initializes a memory of a trellis encoder in a predetermined position of the interleaved known data to trellis encode the interleaved data to an 8-level symbol at a rate of 2/3, the signal processing method comprising:
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receiving the signal transmitted by the digital transmitter, the signal having the trellis encoded symbol corresponding to the known data, the known data being processed by the initialized trellis encoder of the transmitter; performing a VSB demodulation of the received signal, which was modulated by the modulator of the transmitter; and removing an interference of the demodulated signal according to the trellis encoded symbol corresponding to the known data by compensating for a channel distortion of the demodulated signal due to a multi-path of a channel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification