Signalling Coding With Parity Permutation for High-Threshold Broadcasts
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Solution Overview
Problem
Existing broadcast communication standards, such as DVB-T2, face challenges in providing high-efficiency and flexible signalling coding and modulation methods for services with high receiving thresholds, especially with the emergence of high-data-volume services like ultra HD, where receiving thresholds exceed 25 dB or 30 dB in white noise channels.
Innovation Solution
A signalling coding and modulation method that involves extending and processing signalling data using predetermined patterns, conducting BCH and LDPC coding, parity bit permutation, punching, and mapping to achieve robust and efficient signalling symbols, suitable for high-throughput data services with variable lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coding and modulation methods are used for signalling, then the receiving threshold can be kept low, but the spectrum frequency efficiency and adaptability to high receiving threshold services deteriorate
Solution Approach 1:
The patent implements dynamic selection of coding schemes and modulation orders based on service type and receiving threshold requirements. The system can adaptively choose between different coding methods (convolutional, Turbo, LDPC) and modulation schemes (QPSK, 16QAM, 64QAM, 256QAM) to match the specific service needs, whether low threshold or high threshold services
Solution Approach 2:
The patent changes key parameters including code rate, modulation order, and coding scheme type based on the service requirements. For high receiving threshold services, the system adjusts these parameters to provide stronger error correction capability while maintaining spectral efficiency, resolving the contradiction between reliability and adaptability
2Reliability
If stronger protection is provided for signalling to ensure lower receiving threshold, then the reliability improves, but the spectrum frequency efficiency deteriorates
Solution Approach 1:
The patent applies different coding and modulation strategies to different parts of the transmission based on their importance and requirements. Signalling receives tailored protection levels appropriate to its needs, while data services receive optimized treatment for their specific requirements, avoiding uniform over-protection that would waste spectrum resources
Solution Approach 2:
The system dynamically adjusts the level of protection for signalling based on channel conditions and service requirements. When channel conditions are good or service requirements are modest, less protection is applied, improving spectral efficiency. When conditions deteriorate or high reliability is needed, protection is increased accordingly
3Device complexity
If conventional coding methods are used, then the device complexity remains low, but the efficiency for high receiving threshold services deteriorates
Solution Approach 1:
The patent segments the coding and modulation process into distinct stages with different algorithms optimized for specific functions. This modular approach allows efficient processing at each stage while maintaining overall system performance for high receiving threshold services, balancing complexity and productivity
4Adaptability or versatility
If the signalling length is made variable to accommodate different services, then the adaptability improves, but the coding and modulation complexity increases
Solution Approach 1:
The patent implements dynamic signalling length adjustment based on the number and type of services in the physical frame. The system can extend or truncate signalling to match actual requirements, and the coding/modulation parameters are dynamically adjusted to accommodate this variability without excessive complexity through standardized processing blocks
Data Source
AI summary
Provided are a signaling coding and modulation method and a demodulation and decoding method and device, characterized in that the method comprises the steps of: extending signaling which has been subjected to first predetermined processing according to an extension pattern table to obtain an extended codeword, and conducting predetermined coding on the extended codeword to obtain a encoded codeword; conducting parity bit permutation on a parity bit portion in the encoded codeword and then splicing the permutated parity bits to the end of information bits in the encoded codeword, to obtain a permutated encoded codeword; according to the length of the signaling, punching the permutated encoded codeword according to a predetermined punching rule to obtain a punched encoded codeword; and conducting second predetermined processing on the punched encoded codeword to obtain a tuple sequence, which is used for mapping, and then mapping the tuple sequence.