LDPC Parity Interleaving for Fixed-Length Signaling Puncturing
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Solution Overview
Problem
Current channel encoding and modulation techniques for signaling information in broadcast systems lack robustness and efficiency, necessitating the development of new methods optimized for signaling information transmission.
Innovation Solution
A parity interleaving apparatus and method that segment and group-wise interleave parity bits of an LDPC codeword, optimizing puncturing and interleaving based on specific sequences and code rates to enhance transmission efficiency for signaling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding and modulation techniques are used for signaling information transmission, then the system can maintain compatibility with existing standards, but the transmission robustness and efficiency are insufficient
Solution Approach 1:
The parity bits are divided into multiple groups (e.g., 36 groups of 360 bits each) and processed independently through group-wise interleaving. This segmentation allows the encoding system to handle large blocks of data in manageable units, improving robustness while maintaining manageable complexity through modular processing
Solution Approach 2:
The system dynamically adjusts the puncturing amount based on the actual signaling information length. The puncturing amount calculation unit computes the optimal puncturing amount by considering the difference between the maximum signaling information length and the actual length, allowing the system to adapt encoding parameters to match actual transmission needs, thereby improving efficiency without excessive complexity
2Productivity
If the puncturing amount is not optimized according to signaling information length, then the encoding process is simpler, but the transmission efficiency decreases
Solution Approach 1:
The system pre-calculates the puncturing amount based on the signaling information length before the actual encoding process. By determining the optimal puncturing amount in advance using the formula that considers maximum length and actual length differences, the system prepares encoding parameters beforehand, improving transmission efficiency while avoiding complex real-time adjustments during encoding
Solution Approach 2:
The system changes the puncturing parameter dynamically based on the signaling information length. When the signaling information length varies, the puncturing amount is adjusted accordingly through parameter recalculation, allowing the system to optimize transmission efficiency for different message lengths without requiring a completely different encoding approach
3Reliability
If group-wise interleaving is applied to parity bits, then the error correction capability is improved, but the processing complexity increases
Solution Approach 1:
The parity bits are segmented into multiple groups that are interleaved independently. This group-wise approach distributes error impacts across groups while maintaining manageable processing complexity through systematic organization of the interleaving operation
Solution Approach 2:
The system applies interleaving in the group dimension rather than processing individual bits sequentially. By organizing parity bits into groups and performing interleaving operations at the group level with defined permutation patterns, the system achieves enhanced error correction capability while reducing processing complexity compared to bit-level interleaving
Data Source
AI summary
A parity interleaving apparatus and method for fixed length signaling information are disclosed. A parity interleaving apparatus according to an embodiment of the present invention includes a processor configured to generate a parity bit string for parity puncturing by segmenting parity bits of an LDPC codeword whose length is 16200 and whose code rate is 3/15, into a plurality of groups, and group-wise interleaving the groups using an order of group-wise interleaving; and memory configured to provide the parity bit string for parity puncturing to a parity puncturing unit.