LDPC Parity Puncturing for Fixed-Length Broadcast Signaling
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Solution Overview
Problem
Current channel encoding and modulation techniques for signaling information in broadcast systems lack robustness and efficiency, particularly in next-generation digital broadcasting systems.
Innovation Solution
A parity puncturing apparatus and method that optimizes channel encoding and modulation for signaling information transmission using an LDPC codeword with a code rate of 3/15, involving parity bit string generation and puncturing, along with group-wise interleaving and zero padding, to enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding and modulation techniques are used for signaling information transmission, then the system maintains compatibility with existing standards, but the transmission robustness and efficiency are insufficient for next-generation digital broadcasting systems
Solution Approach 1:
The patent applies parameter changes by modifying the puncturing rate and code rate parameters specifically for signaling information transmission. The code rate is set to 3/15 (higher than conventional rates) and the puncturing rate is optimized based on signaling information characteristics, thereby improving transmission robustness while maintaining standard compatibility
Solution Approach 2:
The patent segments the transmission process into distinct stages: BCH encoding stage, LDPC encoding stage, and puncturing stage. Each stage is optimized independently with specific parameters tailored for signaling information, allowing targeted improvement of transmission reliability without affecting overall system compatibility
2Productivity
If the code rate is increased to improve transmission efficiency, then fewer parity bits are required, but the error correction capability may be reduced
Solution Approach 1:
The patent employs dynamic puncturing where the puncturing rate is adjusted based on the signaling information amount and channel conditions. The puncturing operation is performed selectively on parity bits after LDPC encoding, allowing the system to adaptively balance between transmission efficiency and error correction capability rather than using a fixed code rate
Solution Approach 2:
The patent performs preliminary BCH encoding before LDPC encoding, creating a multi-layer protection structure. This preliminary error correction layer is applied to the signaling information before the main LDPC encoding, ensuring that even with higher code rates, the overall error correction capability is maintained through the cascaded coding structure
3Quantity of substance
If puncturing is applied to reduce transmission overhead, then the bandwidth efficiency improves, but the parity protection is reduced
Solution Approach 1:
The patent applies partial puncturing where only a portion of the parity bits are punctured rather than all parity bits. The puncturing is performed on selected parity bit positions after LDPC encoding, removing redundant parity information while retaining sufficient protection capability. This partial action achieves bandwidth efficiency improvement without completely sacrificing parity protection
Data Source
AI summary
A parity puncturing apparatus and method for fixed length signaling information are disclosed. A parity puncturing apparatus according to an embodiment of the present invention includes memory configured to provide a parity bit string for parity puncturing for the parity bits of an LDPC codeword whose length is 16200 and whose code rate is 3/15, and a processor configured to puncture a number of bits corresponding to a final puncturing size from the rear side of the parity bit string.