8VSB DTV signals with PCCC and subsequent trellis coding
First Claim
1. A method for transmitting ancillary data within an 8VSB digital television broadcasting signal, said method comprising the steps of:
- coding said ancillary data using parallelly concatenated convolutional codes, which step generates coded ancillary data;
placing said coded ancillary data within 1656-bit data segments;
time-division multiplexing said 1656-bit data segments having said coded ancillary data placed therewithin, together with any other 1656-bit data segments to be included in said 8VSB digital television broadcasting signal, to form a stream of 1656-bit data segments;
convolutionally byte interleaving successive 8-bit bytes of said stream of 1656-bit data segments to generate byte-interleaved data;
symbol coding said byte-interleaved data to generate symbol codes, which step includes 2/3 trellis coding said byte-interleaved data;
generating plural-level 8 VSB modulating signal responsive to said symbol codes; and
modulating a radio-frequency carrier wave responsive to said plural-level 8 VSB modulating signal to generate said 8VSB digital television broadcasting signal.
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Accused Products
Abstract
Data to be more robustly transmitted within 8VSB broadcast DTV signals are turbo coded using parallelly concatenated convolutional coding (PCCC) and incorporated within the segments of data fields, the bytes of which are convolutionally interleaved before trellis coding and 8VSB symbol mapping. Packing the PCCC into payload fields of MPEG-2-compatible null data packets and Reed-Solomon coding the packets to generate the segments of data fields, the bytes of which are convolutionally interleaved, conditions legacy DTV receivers to disregard PCCC components not useful to them. Transversal packing turbo-coded Reed-Solomon codewords into the payload fields of MPEG-2-compatible null data packets increases the capability of those turbo-coded Reed-Solomon codewords to overcome burst errors. Repeated transmissions of the transversally packed turbo-coded Reed-Solomon codewords in whole or in part allows them to overcome protracted deep fades encountered during mobile reception of 8VSB DTV signals.
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Citations
20 Claims
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1. A method for transmitting ancillary data within an 8VSB digital television broadcasting signal, said method comprising the steps of:
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coding said ancillary data using parallelly concatenated convolutional codes, which step generates coded ancillary data; placing said coded ancillary data within 1656-bit data segments; time-division multiplexing said 1656-bit data segments having said coded ancillary data placed therewithin, together with any other 1656-bit data segments to be included in said 8VSB digital television broadcasting signal, to form a stream of 1656-bit data segments; convolutionally byte interleaving successive 8-bit bytes of said stream of 1656-bit data segments to generate byte-interleaved data; symbol coding said byte-interleaved data to generate symbol codes, which step includes 2/3 trellis coding said byte-interleaved data; generating plural-level 8 VSB modulating signal responsive to said symbol codes; and modulating a radio-frequency carrier wave responsive to said plural-level 8 VSB modulating signal to generate said 8VSB digital television broadcasting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for transmitting ancillary data within an 8VSB digital television broadcasting signal, said method comprising the steps of:
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coding said ancillary data using parallelly concatenated convolutional codes, which step generates coded ancillary data; placing said coded ancillary data within 1496-bit data packets; time-division multiplexing said 1496-bit packets having said coded ancillary data placed therewithin, together with any other 1496-bit packets to be included in said 8VSB digital television broadcasting signal, to form a transport stream of 1496-bit packets; (207,
187) Reed-Solomon forward error-correction coding each of said 1496-bit packets in said transport stream to generate respective ones of a principal stream of 1656-bit Reed-Solomon codewords;convolutionally byte interleaving successive 8-bit bytes of said principal stream of said 1656-bit Reed-Solomon codewords to generate byte-interleaved data; symbol coding said byte-interleaved data to generate symbol codes, which step includes 2/3 trellis coding said byte-interleaved data; generating plural-level 8 VSB modulating signal responsive to said symbol codes; and modulating a radio-frequency carrier wave responsive to said plural-level 8 VSB modulating signal to generate said 8VSB digital television broadcasting signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A receiver for 8VSB digital television signals that convey robust data generated by parallelly concatenated convolutional coding (PCCC), said receiver comprising:
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apparatus for converting a selected 8VSB digital television signal received as an amplitude-modulated radio-frequency carrier to a baseband digital television signal, which apparatus includes front-end circuitry, an analog-to-digital converter, a demodulator for 8VSB digital television signals and a channel equalization filter; a 12-phase trellis decoder for providing soft decisions concerning symbols in said baseband digital television signal, said 12-phase trellis decoder connected to receive baseband digital television signal from said apparatus for converting a selected 8VSB digital television signal received as an amplitude-modulated radio-frequency carrier to a baseband digital television signal; circuitry for generating response just to selected soft decisions concerning symbols in said baseband digital television signal that concern parallelly concatenated convolutional coding, said circuitry connected for receiving said soft decisions concerning symbols in said baseband digital television signal from said 12-phase trellis decoder PCCC decoder apparatus for decoding parallelly concatenated convolutional coding, said PCCC decoder apparatus connected for receiving as its input signal said response just to selected soft decisions concerning symbols in said baseband digital television signal that concern parallelly concatenated convolutional coding; and apparatus for utilizing reproduced robust data supplied from said PCCC decoder apparatus in response to said input signal received thereby.
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Specification