LDPC Zero Padding Using Shortening Order for Fixed-Length 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 zero padding technique is introduced, where a processor generates an LDPC information bit string by filling specific groups with zeros based on the difference between the LDPC and BCH-encoded bit string lengths, using a shortening pattern order, and providing the resulting bit string to an LDPC encoder for optimized encoding and modulation.
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 robustness and efficiency of signaling information transmission deteriorates
Solution Approach 1:
The signaling information is divided into multiple groups (first group, second group, third group) with different handling methods. The first group undergoes zero-padding while the second and third groups are directly encoded, allowing differential treatment to enhance robustness without uniformly increasing complexity across all signaling data.
Solution Approach 2:
Zero-padding is performed on the first group of signaling information before LDPC encoding, preparing the data in advance to improve transmission robustness. This preliminary action ensures that critical signaling information has enhanced error correction capability before the encoding process begins.
2Reliability
If zero padding is applied to all signaling information groups, then the robustness of transmission improves, but the transmission efficiency and bandwidth utilization deteriorates
Solution Approach 1:
Different quality levels of error protection are applied to different groups of signaling information. The first group receives zero-padding for enhanced protection, while the second and third groups use standard encoding, optimizing the balance between robustness and efficiency for different types of signaling data.
Solution Approach 2:
Instead of applying zero-padding to all signaling information (excessive action), the patent applies it only to the first group (partial action), achieving sufficient robustness for critical signaling data while maintaining transmission efficiency for other groups.
3Device complexity
If the length of LDPC information bit string is made fixed, then the encoding process becomes simpler, but the adaptability to different signaling information lengths deteriorates
Solution Approach 1:
The signaling information is pre-processed by padding with zeros to extend it to a fixed length before LDPC encoding. This preliminary action allows the use of fixed-length encoding algorithms while accommodating variable-length input signaling information, maintaining both simplicity and adaptability.
Solution Approach 2:
The length parameter of the information bit string is dynamically adjusted through zero-padding to match the required fixed length for LDPC encoding. This parameter transformation enables the system to handle variable-length signaling information while maintaining a fixed-length encoding process.
Data Source
AI summary
A zero padding apparatus and method for fixed length signaling information are disclosed. A zero padding apparatus according to an embodiment of the present invention includes a processor configured to generate a LDPC information bit string by deciding a number of groups whose all bits are to be filled with 0 using a difference between a length of the LDPC information bit string and a length of a BCH-encoded bit string, selecting the groups using a shortening pattern order to fill all the bits of the groups with 0, and filling at least a part of remaining groups, which are not filled with 0, with the BCH-encoded bit string; and memory configured to provide the LDPC information bit string to an LDPC encoder.