CA2403133A1 - Vsb reception system with enhanced signal detection for processing supplemental data - Google Patents

Vsb reception system with enhanced signal detection for processing supplemental data Download PDF

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CA2403133A1
CA2403133A1 CA002403133A CA2403133A CA2403133A1 CA 2403133 A1 CA2403133 A1 CA 2403133A1 CA 002403133 A CA002403133 A CA 002403133A CA 2403133 A CA2403133 A CA 2403133A CA 2403133 A1 CA2403133 A1 CA 2403133A1
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signal
vsb
reception system
supplemental data
sequence
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CA002403133A
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CA2403133C (en
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In Hwan Choi
Young Mo Gu
Kyung Won Kang
Kook Yeon Kwak
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LG Electronics Inc
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2933—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using a block and a convolutional code
    • H03M13/2936—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using a block and a convolutional code comprising an outer Reed-Solomon code and an inner convolutional code
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    • H—ELECTRICITY
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    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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    • H—ELECTRICITY
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    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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    • H04L1/0064—Concatenated codes
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
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    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/211—Ghost signal cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03382—Single of vestigal sideband

Abstract

A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB
transmission system by using the sequence, and a demultiplexer for demultiplexing the data from the modified legacy VSB receiver into the MPEG
data and the supplemental data. The VSB reception system also includes a supplemental data processor for processing the supplemental data segment from the demultiplexer in a reverse order of the transmission system, to obtain the supplemental data, thereby carrying out the slicer prediction, decoding, and symbol decision more accurately by using the predefined sequence, to improve a performance.

Claims (24)

1. A VSB reception system for receiving and decoding an input signal comprising an MPEG data segment and a supplemental data segment transmitted from a VSB transmission system, the VSB reception system comprising:
a sequence generator for decoding a symbol corresponding to the supplemental data segment and generating a predefined sequence encoded with the supplemental data segment;
a modified legacy VSB receiver for processing the input signal received from the VSB transmission system in a reverse order of the VSB transmission system and outputting a derandomized data signal;
a demultiplexer for demultiplexing the derandomized data signal from the modified legacy VSB receiver into the MPEG data segment and an encoded supplemental data segment; and a supplemental data processor for decoding the encoded supplemental data segment from the demultiplexer to obtain the supplemental data segment.
2. A VSB reception system of claim 1, wherein the sequence generator includes:
a multiplexer for receiving and multiplexing a supplemental data dummy packet and an MPEG data dummy packet and outputting as a multiplexer output signal;
a randomizer for randomizing the multiplexer output signal;
a parity inserter for inserting dummy bytes to randomized data;
a data interleaver for interleaving an output of the parity inserter; and a trellis coder for converting interleaved data to symbols and outputting the converted symbols without subjecting to trellis coding.
3. A VSB reception system of claim 2, wherein the trellis coder includes a plurality of coders and precoders for receiving the symbols and forwarding the symbols without subjecting to precoding and coding.
4. A VSB reception system of claim 3, wherein the symbols from the trellis coder includes two bits D1 and D0, wherein if the bit D1 is at a first logic level, a symbol corresponds to a supplemental data symbol, and if the bit D1 is at a second logic level, the symbol is an MPEG data symbol, and when the bit D1 is at the first logic level, the bit DO is the predefined sequence being used to decode the supplemental data segment.
5. A VSB reception system of claim 2, wherein the randomizer subjects the output signal of the multiplexer using pseudo random bytes and 0x55 to a bit-wise AND logical operation, and a result of the AND logical operation and input bits from the multiplexer to a bit-wise exclusive OR logical operation.
6. A VSB reception system of claim 2, wherein the dummy bytes correspond to the 20 parity bytes are dummy bytes of 0x00, and the MPEG data dummy packet produces 187 dummy bytes of 0x00, and the supplemental data dummy packet produces three dummy bytes of 0x00 corresponding to the MPEG header bytes, and 184 dummy bytes of OxAA corresponding to the supplemental data packet.
7. A VSB reception system of claim 1, wherein the modified legacy VSB
receiver includes:
a demodulator for receiving the input signal through and converting the input signal into a base band signal, and recovering a segment synchronizing signal, a field synchronizing signal, and a symbol timing from the base band signal;
a comb filter for removing an NTSC interference signal from an output signal of the demodulator, if the NTSC interference signal is detected;
a slicer predictor for providing a slicer prediction signal and a prediction reliability signal by using a predefined sequence from the sequence generator;

a channel equalizer for correcting a distorted channel in an output signal of the comb filter by using the slicer prediction signal, the prediction reliability signal and the predefined sequence and outputting a channel equalizer output signal;
a phase tracker for correcting a phase of an output signal of the channel equalizer by using the predetermined sequence and the slicer prediction signal;
a trellis decoder for decoding an output of the phase tracketer using Viterbi algorithm and the predefined sequence received from the sequence generator;
a data deinterleaver for deinterleaving a trellis decoder output signal;
a Reed-Solomon decoder for decoding a Reed-Solomon coded signal outputted from the data deinterleaver; and a data derandomizer for derandomizing a Reed-Solomon decoder output signal.
8. A VSB reception system of claim 7, wherein the Reed-Solomon decoder of the modified legacy VSB receiver removes 20 parity bytes without subjecting the supplemental data segment to Reed-Solomon decoding.
9. A VSB reception system of claim 7, wherein the demultiplexer demultiplexes the derandomized data signal from the modified legacy VSB
receiver into the MPEG data segment and the encoded supplemental data segment by using the a multiplexing information signal detected from the field synchronizing signal.
10. A VSB reception system of claim 1, wherein the supplemental data processor includes:
an MPEG header remover for removing three MPEG header bytes from the supplemental data segment received from the demultiplexer;
a null sequence remover for removing the null sequence inserted to the supplemental data packet; and a Reed-Solomon decoder for subjecting a null sequence remover output to Reed-Solomon decoding.
11. A VSB reception system of claim 10, further comprising a deinterleaver between the null sequence remover and the Reed-Solomon decoder for deinterleaving the null sequence remover output.
12. A VSB reception system of claim 7, wherein the channel equalizer includes:
a plurality of slivers each having a predetermined signal level detector;
a feed-forward filter for receiving a comb filter output signal;
a feedback filter for receiving an output signal of one of the plurality of slivers;
an adder for adding output signals of the feed-forward filter and the feedback filter and outputting an added signal as a channel equalizer output signal, wherein the plurality of slivers commonly receive the added signal;
a multiplexer for outputting one of the outputs of the plurality of slivers to the feedback filter in response to a control signal; and a controller for updating filter coefficients of the feed-forward filter and the feedback filter and providing the control signal to the multiplexes in response to a multiplexes output signal, the sliver prediction signal, and the prediction reliability signal, the channel equalizer output signal and the predefined sequence to select the multiplexes to output signal from one of the plurality of slivers that has the predetermined signal level detector closes to the comb filter output signal.
13. A VSB reception system of claim 12, wherein the sliver predictor receives the channel equalizer output signal, the predefined sequence generated from the sequence generator and information that the symbol received is of the supplemental data packet, estimates a register value of the trellis codes, calculates prediction reliability, and forwards the estimated register value to the controller of the channel equalizer.
14. A VSB reception system of claim 13, wherein the plurality of slicers includes first to third slicers for processing MPEG data symbols, and fourth to ninth slicers for processing the supplemental data symbols, wherein the first slicer has 8 level values of-7, -5, -3, -1, +1, +3, +5, +7, the second slicer has 4 level values of-7, -3, +l, +5, the third slicer has 4 level values of -5, -1, +3, +7, the fourth dicer has 4 level values of -7, -5, +1, +3, the fifth dicer has 4 level values of -3, -1, +5, +7, the sixth dicer has 2 level values of -7, +1, the seventh slicer has 2 level values of -5, +3, the eighth dicer has 2 level values of -3, +5, and the ninth slicer has 2 level values of -1, +7.
15. A VSB reception system of claim 14, wherein -7 denotes 000, -5 denotes 001, -3 denotes 010, -1 denotes 011, +1 denotes 100, +3 denotes 101, +5 denotes 110, and +7 denotes 111.
16. A VSB reception system of claim 14, wherein, with respect to the MPEG data symbols, the first slicer is selected in a low reliability case, the second dicer is selected for a high reliability case and the estimated register value is at a first logic level, and the third dicer is selected for a high reliability case and the estimated register value is at a second logic level.
17. A VSB reception system of claim 14, wherein, with respect to the supplemental data symbols;
one of the fourth slicer and the fifth slicer is selected in response to the predefined sequence for a low reliability case;
the sixth slicer is selected for a high reliability case and the predefined sequence value and the estimated register value are at a first logic level;
the seventh slicer is selected for a high reliability case and the predefined sequence value is at a first logic level and the estimated register value is at a second logic level;

the eighth slicer is selected for a high reliability case and the predefined sequence value is at a second logic level and the estimated register value is at a first logic level; and the ninth slicer is selected for a high reliability case and the predefined sequence value and the estimated register value are at a second logic level.
18. A VSB reception system of claim 1, wherein the sequence generator is responsive in synchronous to the field synchronizing signal.
19. A VSB reception system for receiving and decoding an input signal comprising an MPEG data segment and a supplemental data segment transmitted from a VSB transmission system, the VSB reception system comprising:
a modified legacy VSB receiver for processing the input signal received from the VSB transmission system in a reverse order of the VSB transmission system and outputting a derandomized data signal;
a demultiplexer for demultiplexing the derandomized data signal from the modified legacy VSB receiver into the MPEG data segment and an encoded supplemental data segment; and a supplemental data processor for decoding the encoded supplemental data segment from the demultiplexer to obtain the supplemental data segment, wherein the supplemental data processor includes:
an MPEG header remover for removing three MPEG header bytes from the supplemental data segment received from the demultiplexer;
a null sequence remover for removing the null sequence inserted to the supplemental data packet; and a Reed-Solomon decoder for subjecting a null sequence remover output to Reed-Solomon decoding.
20. A VSB reception system of claim 19, wherein the modified legacy VSB

receiver includes:
a demodulator for receiving the input signal through and converting the input signal into a base band signal, and recovering a segment synchronizing signal, a field synchronizing signal, and a symbol timing from the base band signal;
a comb filter for removing an NTSC interference signal from an output signal of the demodulator, if the NTSC interference signal is detected;
a dicer predictor for providing a slicer prediction signal and a prediction reliability signal by using a predefined sequence from the sequence generator;
a channel equalizer for correcting a distorted channel in an output signal of the comb filter by using the slicer prediction signal, the prediction reliability signal and the predefined sequence and outputting a channel equalizer output signal;
a phase tracker for correcting a phase of an output signal of the channel equalizer by using the predetermined sequence and the dicer prediction signal;
a trellis decoder for decoding an output of the phase tracketer using Viterbi algorithm and the predefined sequence received from the sequence generator;
a data deinterleaver for deinterleaving a trellis decoder output signal;
a Reed-Solomon decoder for decoding a Reed-Solomon coded signal outputted from the data deinterleaver; and a data derandomizer for derandomizing a Reed-Solomon decoder output signal.
21. A VSB reception system of claim 20, wherein the Reed-Solomon decoder of the modified legacy VSB receiver removes 20 parity bytes without subjecting the supplemental data segment to Reed-Solomon decoding.
22. A VSB reception system of claim 19, wherein the demultiplexer demultiplexes the derandomized data signal from the modified legacy VSB
receiver into the MPEG data segment and the encoded supplemental data segment by using the a multiplexing information signal detected from the field synchronizing signal.
23. A VSB reception system of claim 21, wherein the demultiplexer demultiplexes the derandomized data signal from the modified legacy VSB
receiver into the MPEG data segment and the encoded supplemental data segment by using the a multiplexing information signal detected from the field synchronizing signal.
24. A VSB reception system of claim 19, further comprising a deinterleaver between the null sequence remover and the Reed-Solomon decoder for deinterleaving the null sequence remover output.
CA2403133A 2001-01-19 2001-12-27 Vsb reception system with enhanced signal detection for processing supplemental data Expired - Fee Related CA2403133C (en)

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CA2707816A CA2707816C (en) 2001-01-19 2001-12-27 Vsb reception system with enhanced signal detection for processing supplemental data

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Application Number Priority Date Filing Date Title
KR1020010003304A KR100674423B1 (en) 2001-01-19 2001-01-19 Transmitting/receiving system and data processing method
KR2001/03304 2001-01-19
PCT/KR2001/002277 WO2002058387A1 (en) 2001-01-19 2001-12-27 Vsb reception system with enhanced signal detection for processing supplemental data

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CA2403133C CA2403133C (en) 2011-07-12

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