Signalling Coding and Modulation for High-Threshold Broadcast Services
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing broadcast communication standards, such as DVB-T2, face challenges in providing high-efficiency and flexible signalling coding and modulation methods, especially for services with receiving thresholds exceeding 25 dB or 30 dB in white noise channels, which are not adequately addressed by current technologies.
Innovation Solution
A signalling coding and modulation method that involves extending and coding the signalling, conducting parity bit permutation, punching the encoded codeword according to specific rules, and mapping it into a signalling symbol, using techniques like BCH and LDPC coding, permutation, and constellation mapping to achieve robust and efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing 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 are insufficient
Solution Approach 1:
The patent implements dynamic selection of coding schemes (BCH, LDPC, or hybrid) and modulation orders based on service-specific receiving thresholds. The system adapts the coding and modulation parameters according to the actual service requirements, enabling flexible adjustment between robustness and spectral efficiency for different service types including ultra HD services with thresholds exceeding 25 dB or 30 dB.
Solution Approach 2:
The patent changes key parameters including coding scheme selection (BCH, LDPC, or hybrid), code rates, and modulation orders to match different service receiving thresholds. By adjusting these parameters dynamically, the system achieves both low receiving threshold performance for standard services and high receiving threshold capability for ultra HD services, resolving the contradiction between reliability and adaptability.
2Reliability
If stronger protection is provided for signalling to ensure lower receiving threshold, then reliability improves, but spectrum frequency efficiency decreases
Solution Approach 1:
The patent applies different coding and protection schemes to different parts of the data stream based on their importance. Signalling elements receive stronger protection with appropriate coding schemes, while data elements use more efficient but less robust coding. This localized differentiation of protection quality ensures signalling reliability without unnecessarily sacrificing spectrum frequency efficiency for the entire transmission.
Solution Approach 2:
The system dynamically adjusts the level of protection and coding scheme based on the specific service requirements and channel conditions. For services with lower receiving thresholds, standard protection is applied, while for ultra HD services with higher thresholds, enhanced protection is activated. This dynamic adjustment optimizes the balance between signalling reliability and spectrum frequency efficiency under different operating conditions.
3Reliability
If coding and modulation provide strong protection for signalling, then receiving threshold is reduced, but flexibility for variable signalling length is compromised
Solution Approach 1:
The patent implements a dynamic coding framework that adapts to variable signalling lengths by selecting appropriate coding schemes and parameters. The system can switch between BCH, LDPC, and hybrid coding modes, and adjust code rates and block lengths based on the actual signalling data length and service requirements. This dynamic adaptation maintains both strong protection for reliable receiving and flexibility for handling variable-length signalling.
Solution Approach 2:
The patent segments the coding process into multiple stages with different coding schemes applied at different stages. The hybrid coding approach divides the coding task between BCH (for strong error correction) and LDPC (for flexibility and rate adaptation). This segmentation allows the system to provide strong protection while maintaining flexibility for variable signalling lengths through the complementary strengths of different coding schemes.
4Adaptability or versatility
If existing technology is used for services with receiving thresholds exceeding 25 dB or 30 dB, then standard compatibility is maintained, but transmission efficiency and robustness are insufficient
Solution Approach 1:
The patent creates a universal coding and modulation framework that can handle both standard services and ultra HD services with high receiving thresholds. The system maintains compatibility with existing DVB-T2 standards while incorporating enhanced coding schemes (hybrid BCH-LDPC) and flexible modulation options that provide improved transmission efficiency and robustness for high-threshold services, achieving multi-functionality across different service types.
Solution Approach 2:
The patent changes key transmission parameters including coding scheme selection, code rates, and modulation orders to optimize performance for services with receiving thresholds exceeding 25 dB or 30 dB. By adjusting these parameters while maintaining standard compatibility, the system achieves both backward compatibility and improved transmission efficiency for ultra HD and other high-throughput data services.
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.