LDPC Parity Puncturing with Group-Wise Interleaving for 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 using LDPC codewords 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 structure remains simple, but the transmission robustness and efficiency deteriorate
Solution Approach 1:
The LDPC codeword is divided into information bits and parity bits, with the parity bits further segmented and punctured according to the signaling information length. This segmentation allows flexible adaptation to different signaling information sizes while maintaining encoding robustness through selective parity bit transmission.
Solution Approach 2:
The code rate is specifically set to 3/15 and the codeword length to 16200 bits, with dynamic puncturing of parity bits based on the actual signaling information length. These parameter optimizations enable the system to achieve high transmission robustness while adapting to variable signaling information requirements.
2Adaptability or versatility
If the amount of signaling information varies, then the system adapts to different information lengths, but the transmission efficiency deteriorates without optimized puncturing
Solution Approach 1:
The puncturing scheme dynamically adjusts the number of transmitted parity bits based on the actual signaling information length. When signaling information is short, more parity bits are transmitted for robustness; when signaling information is long, fewer parity bits are transmitted to improve efficiency. This dynamic adaptation optimizes the balance between reliability and productivity.
Solution Approach 2:
The system changes the effective code rate by puncturing different numbers of parity bits according to the signaling information length, while maintaining the base LDPC code structure of 3/15. This parameter adaptation enables versatile handling of variable-length signaling information with optimized transmission efficiency for each case.
3Reliability
If more parity bits are transmitted for robustness, then transmission reliability improves, but the transmission time increases
Solution Approach 1:
Instead of transmitting all generated parity bits, the system selectively transmits only the necessary portion based on signaling information length. This partial transmission approach provides sufficient error correction capability for reliable decoding while minimizing transmission time, avoiding the excessive action of transmitting all parity bits regardless of need.
Solution Approach 2:
The system dynamically determines the optimal number of parity bits to transmit based on the signaling information length and channel conditions. This dynamic adjustment ensures that enough parity bits are transmitted to maintain reliability while minimizing unnecessary transmission time, achieving the optimal balance between these two parameters.
Data Source
AI summary
A parity puncturing apparatus and method for variable 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.