LDPC Zero Padding for Variable-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 zero padding technique is introduced, where a processor generates an LDPC information bit string by filling specific groups with zeros based on a shortening pattern order, and the remaining groups are filled with a BCH-encoded bit string, optimizing the transmission of signaling information through a broadcast system channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding techniques are used for signaling information, then the transmission can be performed with simple structure, but the robustness and error correction performance are insufficient
Solution Approach 1:
The signaling information is segmented into multiple groups (first group, second group, third group) with different lengths. Each group is independently encoded using appropriate channel coding schemes, allowing the system to achieve robust error correction while maintaining manageable complexity through modular processing of divided data segments.
2Adaptability or versatility
If the LDPC information bit string length is fixed, then the encoding process is simplified, but the adaptability to different signaling information lengths is reduced
Solution Approach 1:
The system dynamically adapts the LDPC information bit string length based on the actual signaling information length. When signaling information is shorter than the standard length, zero-padding is applied to extend it to the required length (e.g., 3240 bits). This dynamic adjustment allows the system to maintain a fixed encoding structure while adapting to variable input lengths, achieving versatility without excessive complexity.
3Productivity
If zero padding is applied to match LDPC information bit string length, then the encoding efficiency is improved, but the transmission time increases due to processing additional bits
Solution Approach 1:
The system changes the length parameter of the LDPC information bit string to match the actual signaling information length through zero-padding. By adjusting this parameter dynamically, the encoding process becomes more efficient as it processes only the necessary number of bits plus minimal padding, rather than always processing a fixed large block size, thereby reducing unnecessary processing time.
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.