Signalling Coding and Modulation for Flexible High-Threshold Broadcasts
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 is limited and flexibility for variable signalling lengths is insufficient
Solution Approach 1:
The signalling data is segmented into multiple groups and processed through different coding stages (BCH coding followed by LDPC coding). The signalling is divided into information bits and parity bits, with different permutation operations applied to different segments. This segmentation allows the system to achieve both low receiving thresholds and high spectrum efficiency by optimizing each segment independently.
Solution Approach 2:
The patent employs configurable coding parameters including different BCH code rates (1/2, 2/3), LDPC code rates (1/2, 2/3, 3/4, 4/5), and variable constellation sizes (QAM-16, QAM-64, QAM-256, QAM-1024). These parameter changes enable the system to adapt to different service requirements and achieve both low receiving thresholds and high spectrum frequency efficiency simultaneously.
2Reliability
If stronger protection is provided for signalling to ensure lower receiving thresholds, then reliability improves, but the system flexibility and efficiency for high-throughput services deteriorate
Solution Approach 1:
The patent implements dynamic adaptation mechanisms where coding parameters (BCH rate, LDPC rate, constellation size) can be adjusted based on service requirements. The signalling length is variable rather than fixed, allowing the system to dynamically optimize between protection level and efficiency. The permutation operations are configurable to adapt to different signalling lengths and service types.
Solution Approach 2:
The coding and modulation scheme is designed to serve multiple functions: it provides strong protection for traditional services with low receiving thresholds while simultaneously supporting high-throughput services with higher thresholds (25-30 dB). The same framework accommodates variable signalling lengths and different service types, making the system universally applicable across diverse broadcast scenarios.
3Ease of manufacture
If existing coding schemes are used, then implementation is simple, but they cannot provide high efficiency and flexibility for services with receiving thresholds exceeding 25 dB or 30 dB
Solution Approach 1:
The patent combines multiple coding techniques (BCH coding and LDPC coding) in a cascaded structure, merging their strengths to achieve both implementation feasibility and high coding efficiency. The permutation operations are integrated into the existing coding framework rather than added as separate complex stages. This merging allows the system to handle high-throughput services with thresholds exceeding 25 dB while maintaining reasonable implementation complexity.
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, which is used for mapping, into a signaling symbol according to a predetermined mapping rule.