LDPC Zero Padding for Fixed-Length Broadcast Signaling Frames
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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
The implementation of a zero padding technique using a processor to generate an LDPC information bit string by filling specific groups with zeros based on a shortening pattern order, and using an LDPC encoder to optimize channel encoding and modulation for signaling information transmission, specifically for a BCH-encoded bit string in a broadcast system channel.
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 basic functionality, but the robustness and efficiency of transmission are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the encoding parameters (code rate, block length) and modulation parameters (order, scheme) to optimize transmission performance. The system dynamically adjusts these parameters based on channel conditions and signaling information characteristics, transforming fixed conventional parameters into adaptive variables that improve both reliability and efficiency simultaneously
Solution Approach 2:
The patent segments signaling information into multiple parts and processes them through different encoding and modulation stages. By dividing the transmission process into distinct segments (encoding stage, modulation stage, transmission stage), the system can apply optimized techniques to each segment, improving overall transmission robustness and efficiency
2Quantity of substance
If the LDPC information bit string length is increased to accommodate more signaling information, then the information capacity is improved, but the encoding complexity and transmission time increase
Solution Approach 1:
The patent implements dynamic adjustment of the LDPC information bit string length based on the actual amount of signaling information to be transmitted. Rather than using a fixed long bit string, the system dynamically configures the length to match the information capacity requirements, thereby reducing unnecessary encoding and transmission time while maintaining sufficient information capacity
Solution Approach 2:
The system changes the parameter of information bit string length from a fixed value to a variable that adapts to the signaling information volume. This parameter change allows the system to optimize the balance between information capacity and transmission time by adjusting the length according to actual needs
3Reliability
If more groups are filled with zeros to match the LDPC information bit string length, then the encoding robustness is improved, but the transmission efficiency decreases due to increased redundancy
Solution Approach 1:
The patent applies partial zero-filling rather than completely filling all groups with zeros. By selectively filling only the necessary number of groups with zeros to match the LDPC information bit string length, the system achieves sufficient encoding robustness without adding excessive redundancy, thereby maintaining transmission efficiency
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.