CA2461055A1 - Digital transmission system with enhanced data multiplexing in vsb transmission system - Google Patents

Digital transmission system with enhanced data multiplexing in vsb transmission system Download PDF

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Publication number
CA2461055A1
CA2461055A1 CA002461055A CA2461055A CA2461055A1 CA 2461055 A1 CA2461055 A1 CA 2461055A1 CA 002461055 A CA002461055 A CA 002461055A CA 2461055 A CA2461055 A CA 2461055A CA 2461055 A1 CA2461055 A1 CA 2461055A1
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Prior art keywords
enhanced data
data
multiplexes
packet
enhanced
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Granted
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CA002461055A
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French (fr)
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CA2461055C (en
Inventor
In Hwan Choi
Kook Yeon Kwak
Kyung Won Kang
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LG Electronics Inc
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LG Electronics Inc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H04L1/006—Trellis-coded modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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]
    • H04N21/20—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
    • 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

Abstract

A digital VSB transmission system and enhanced data multiplexing method are disclosed. When 1/2 enhanced data coded at a rate of 1/2 and 1/4 enhanced data at a rate of 1/4 are transmitted, timing jitter in MPEG of VSB receiver can be reduced and the size of input buffer in MPEG decoder of the VSB receiver can be reduced by multiplexing the 1/2 enhanced data packet and the 1/4 data packet at predetermined intervals. Multiplexing the 1/2 enhanced data packet and the 1/4 data packet by grouping increases the reception performance of the 1/4 enhanced data. Multiplexing the 1/2 enhanced data packet and the 1/4 data packet alternatively reduces the MPEG timing fitter in the VSB receiver and increases the reception performance of the 1/4 enhanced data.

Claims (38)

1. ~A VSB transmission system for use with main data and first and second enhanced data, the VSB transmission system comprising:
a multiplexer unit comprising at least first and second multiplexers, the multiplexer for multiplexing a first enhanced data packet and a second enhanced data packet according to a first predetermined multiplexing rule, subjecting the multiplexed first and second enhanced data packet to a forward error correction code to produce formatted enhanced data, and the second multiplexer for multiplexing the formatted enhanced data and the main data in response to a second predetermined multiplexing rule;
a first encoder in communication with the multiplexer unit for performing at least one of data randomizing, parity supplementing and data interleaving to a data packet output from the main and enhanced data multiplexer unit;
a symbol processor in communication with the first encoder for converting the data packet data output from the first encoder to a symbol, encoding only enhanced data symbol at rate of 1/L, L being an integer equal to or larger than 2, and converting the symbol to byte unit data;
a first decoder for deinterleaving the byte unit data output from the symbol processor, and removing parity added to the first encoder from the deinterleaved data; and a VSB transmitter for performing trellis coding, parity supplementing and data interleaving to the data output from the first decoder to produce a converted data packet and transmitting the converted data packet.
2. ~The VSB transmission system of claim 1, wherein the first enhanced data is encoded at a code rate of 1/M, M being an integer equal or larger than 2, and the second enhanced data is encoded at a code rate of 1/N, N being an integer greater than M.
3. ~The VSB transmission system of claim 1, wherein the forward error correction code is a Reed-Solomon code.
4. The VSB transmission system of claim 1, wherein the multiplexer unit includes a pre-processor for multiplexing the first enhanced data and the second enhanced data according to the first predetermined multiplexing rule that is at least responsive to a field synchronizing signal and a location control signal that corresponds to locations of the first and the second enhanced data.
5. The VSB transmission system of claim 1, wherein the multiplexer unit comprises:
a main data buffer for temporarily storing the main data inputted in a packet of X-byte unit and generating a main data packet;
a first enhanced data buffer for storing the first enhanced data inputted in a packet of X-byte unit;
a second enhanced data buffer for storing the second enhanced data inputted in a packet of X-byte unit;
a pre-processor for multiplexing the first enhanced data output from the first enhanced data buffer, and the second enhanced data output from the second enhanced data buffer into a packet unit according to the predetermined multiplexing rule, and converting the data to a MPEG transport packet format to generate an enhanced data packet; and the second multiplexer for multiplexing the main data packet output from the main data buffer and the enhanced data packet output from the pre-processor into the segment unit according to a second predetermined multiplexing rule.
6. The VSB transmission system of claim 5, wherein the pre-processor comprises:
a first packet converter for converting the first enhanced data inputted in the packet of X-byte unit into a first enhanced data packet of Y-byte unit;

a second packet converter for dividing the second enhanced data inputted in the packet of X-byte unit into a second enhanced data packet of Y-byte unit;
the first multiplexes for multiplexing the first and second enhanced data packets of Y-byte unit, output from the first and second packet converters, in response to multiplexing information in a field synchronizing signal, and generating second multiplexed enhanced data;
an error correction codes and data interleaves for performing forward error correction coding to the second multiplexed enhanced data and generating interleaved enhanced data;
a null bit inserter for inserting at least one null bit to the interleaved enhanced data;
and an MPEG header inserter for inserting an MPEG header to data output from the null bit inserter.
7. The VSB transmission system of claim 1, wherein a number of the first enhanced data packets, encoded at a code rate of 1/M and multiplexed in one VSB data field, is defined as 'H', and a number of the second enhanced data packets, encoded at a code rate of 1/N, is defined as 'Q', such that the first and the second enhanced data packets are multiplexed in one data field in accordance with 0 <= (MH+NQ) <= K, wherein K is a number of data segments in one data field.
8. The VSB transmission system of claim 1, wherein the first multiplexes multiplexes the first and second data packets at a uniform interval.
9. The VSB transmission system of claim 1, wherein the first multiplexes multiplexes each second enhanced data packet per Int(H/Q) numbered first enhanced data packets at the uniform interval if Q is smaller than H.
10. The VSB transmission system of claim 1, wherein the first multiplexes multiplexes each first enhanced data packet per Int(Q/H) numbered second enhanced data packets at the uniform interval if H is smaller than Q.
11. The VSB transmission system of claim 1, wherein the first multiplexes performs the multiplexing process by separately grouping the first and enhanced data packets in one data field.
12. The VSB transmission system of claim 1, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets.
13. The VSB transmission system of claim 12, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets, and multiplexes and outputs only the second enhanced data packet when one of the enhanced data packets is completely multiplexed.
14. The VSB transmission system of claim 1, wherein the first multiplexes inserts the number of the first and second enhanced data packets, transmitted in one data field, and information for the predetermined multiplexing rule into a reserved bit of a field synchronizing segment as enhanced data multiplexing information, and then multiplexes the first and second enhanced data according to the predetermined multiplexing rule.
15. The VSB transmission system of claim 1, wherein the second multiplexes inserts the information for the number of the first and second enhanced data packets into the reserved bit of the field synchronizing segment as the enhanced data multiplexing information if the multiplexing rule for the first and second enhanced data is determined, and then multiplexes the first and second enhanced data according to the multiplexing rule.
16. The VSB transmission system of claim 6, wherein the null bit inserter outputs 2 bytes encoded at a code rate of 1/2 by inserting a predetermined null bit in between each bit if the first enhanced data of 1 byte is inputted, and the null bit inserter outputs 4 bytes encoded at a code rate of 1/4 by repeating each bit twice, and inserting a predetermined null bit in between each bit if the second enhanced data of 1 byt e is inputted.
17. The VSB transmission system of claim 1, wherein the symbol processor performs 1/2 convolutional encoding to information bit of enhanced data, for generating parity bit, and then outputs information bit, which is not convolutionally encoded, as a high bit of trellis codes, and the parity bit as a low bit.
18 A method for combining first and second enhanced data with main data in a VSB transmission system, the steps comprising:
multiplexing the first and the second enhanced data in a multiplexes unit comprising at least first and second multiplexers, the first multiplexes for multiplexing a first enhanced data packet and a second enhanced data packet according to a first predetermined multiplexing rule, subjecting the multiplexed first and second enhanced data packet to a forward error correction code to produce formatted enhanced data, and the second multiplexes for multiplexing the formatted enhanced data and the main data in response to a second predetermined multiplexing rule;
encoding an output of the multiplexes unit in a first encoder in communication with the multiplexes unit for performing at least one of data randomizing, parity supplementing and data interleaving to a data packet output from the main and enhanced data multiplexes unit;

converting the data packet data output from the first encoder to a symbol in a symbol processor, encoding only enhanced data symbol at rate of 1/L, L being an integer equal to or larger than 2, and converting the symbol to byte unit data; and decoding the byte unit data in a first decoder by deinterleaving the byte unit data output from the symbol processor, and removing parity added to the first encoder from the deinterleaved data.
19. The method of claim 1, wherein the first enhanced data is encoded at a code rate of 1/M, M being an integer equal or larger than 2, and the second enhanced data is encoded at a code rate of 1/N, N being an integer greater than M.
20. The method of claim 18, wherein the multiplexer unit includes a pre-processor for multiplexing the first enhanced data and the second enhanced data according to the first predetermined multiplexing rule that is at least responsive to a field synchronizing signal and a location control signal that corresponds to locations of the first and the second enhanced data.
21. The method of claim 18, wherein a number of the first enhanced data packets, encoded at a code rate of 1/M and multiplexed in one VSB data field, is defined as 'H', and a number of the second enhanced data packets, encoded at a code rate of 1/N, is defined as 'Q', such that the first and the second enhanced data packets are multiplexed in one data field in accordance with 0<=(MH+NQ)<=K, wherein K is a number of data segments in one data field.
22. The method of claim 18, wherein the first multiplexer multiplexes the first and second data packets at a uniform interval.
23. The method of claim 18, wherein the first multiplexes multiplexes each second enhanced data packet per Int(H/Q) numbered first enhanced data packets at the uniform interval if Q is smaller than H.
24. The method of claim 18 wherein the first multiplexes multiplexes each first enhanced data packet per Int(Q/H) numbered second enhanced data packets at the uniform interval if H is smaller than Q.
25. The method of claim 18, wherein the first multiplexes performs the multiplexing process by separately grouping the first and enhanced data packets in one data field.
26. The method of claim 18, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets.
27. The method of claim 26, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets, and multiplexes and outputs only the second enhanced data packet when one of the enhanced data packets is completely multiplexed.
28. The method of claim 18, wherein the first multiplexes inserts the number of the first and second enhanced data packets, transmitted in one data field, and information for the predetermined multiplexing rule into a reserved bit of a field synchronizing segment as enhanced data multiplexing information, and then multiplexes the first and second enhanced data according to the predetermined multiplexing rule.
29. The method of claim 18, wherein the second multiplexer inserts the information for the number of the first and second enhanced data packets into the reserved bit of the field synchronizing segment as the enhanced data multiplexing information if the multiplexing rule for the first and second enhanced data is determined, and then multiplexes the first and second enhanced data according to the multiplexing rule.
30. A multiplexer unit of a VSB transmission system for use with main data and first and second enhanced data, the multiplexer unit comprising:
a first enhanced data buffer for storing first enhanced data inputted in a packet of X-byte unit;
a second enhanced data buffer for storing second enhanced data inputted in a packet of X-byte unit;
a pre-processor comprising a first multiplexer for multiplexing the first enhanced data output from the first enhanced data buffer, and the second enhanced data output from the second enhanced data buffer into a packet unit according to a first predetermined multiplexing rule, and converting the data to a MPEG transport packet format to generate an enhanced data packet; and a second multiplexer for multiplexing main data and the enhanced data packet output from the pre-processor into the segment unit according to a second predetermined multiplexing rule.
31. The muliplexer unit of claim 30, wherein the pre-processor comprises:
a first packet converter for converting the first enhanced data inputted in the packet of X-byte unit into a first enhanced data packet of Y-byte unit;
a second packet converter for dividing the second enhanced data inputted in the packet of X-byte unit into a second enhanced data packet of Y-byte unit;

the first multiplexer for multiplexing the first and second enhanced data packets of Y-byte unit, output from the first and second packet converters, in response to multiplexing information in a field synchronizing signal, and generating second multiplexed enhanced data;
an error correction coder and data interleaver for performing forward error correction coding to the second multiplexed enhanced data and generating interleaved enhanced data;
a null bit inserter for inserting at least one null bit to the interleaved enhanced data;
and an MPEG header inserter for inserting an MPEG header to data output from the null bit inserter.
32. The multiplexer unit of claim 31, wherein a number of the first enhanced data packets, encoded at a code rate of 1/M and multiplexed in one VSB data field, is defined as 'H', and a number of the second enhanced data packets, encoded at a code rate of 1/N, is defined as 'Q', such that the first and the second enhanced data packets are multiplexed in one data field in accordance with 0 <= (MH+NQ) <=
K, wherein K is a number of data segments in one data field.
33. The multiplexer unit of claim 31, wherein the first multiplexer multiplexes the first and second data packets at a uniform interval.
34. The multiplexer unit of claim 31, wherein the first multiplexer multiplexes each second enhanced data packet per Int(H/Q) numbered first enhanced data packets at the uniform interval if Q is smaller than H.
35. The multiplexes unit of claim 31, wherein the first multiplexes multiplexes each first enhanced data packet per Int(Q/H) numbered second enhanced data packets at the uniform interval if H is smaller than Q.
36. The multiplexes unit of claim 31, wherein the first multiplexes performs the multiplexing process by separately grouping the first and enhanced data packets in one data field.
37. The multiplexes unit of claim 31, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets.
38. The multiplexes unit of claim 37, wherein the first multiplexes alternately multiplexes the first and second enhanced data packets, and multiplexes and outputs only the second enhanced data packet when one of the enhanced data packets is completely multiplexed.
CA2461055A 2003-03-21 2004-03-16 Digital transmission system with enhanced data multiplexing in vsb transmission system Expired - Fee Related CA2461055C (en)

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KR10-2003-0017834A KR100510679B1 (en) 2003-03-21 2003-03-21 Digital VSB transmitting system and enhanced data multiplexing method in a VSB transmitting system
KRP2003-17834 2003-03-21

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CA2461055C CA2461055C (en) 2012-12-18

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US (2) US7450613B2 (en)
KR (1) KR100510679B1 (en)
CN (2) CN1306781C (en)
AR (1) AR043659A1 (en)
CA (1) CA2461055C (en)
MX (1) MXPA04002568A (en)

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