LDPC Zero Padding for Variable-Length Signaling Encoding
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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 variable length signaling information.
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 defined shortening pattern order, and feeding this string to an LDPC encoder for optimized encoding and decoding in a Bit-Interleaved Coded Modulation (BICM) system.
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 changes the parameters of channel encoding by introducing variable-length LDPC codes with different code rates (e.g., 1/2, 2/3, 3/4) and block lengths (e.g., 16200, 64800 bits) to optimize both robustness and efficiency for different signaling information transmission scenarios
Solution Approach 2:
The patent implements dynamic selection of encoding parameters based on channel conditions and transmission requirements, allowing the system to adaptively choose between different LDPC code rates and block lengths to balance robustness and transmission efficiency
2Productivity
If zero padding is applied to match LDPC information bit string length with BCH-encoded bit string length, then encoding efficiency is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary zero padding of the BCH-encoded bit string to match the required LDPC information bit string length before LDPC encoding, ensuring that the input data meets the encoding requirements and improving overall encoding efficiency
Solution Approach 2:
The patent introduces zero-padding as an intermediary step between BCH encoding and LDPC encoding, bridging the length mismatch between different encoding stages without requiring complex reconfiguration of the encoding system
Data Source
AI summary
A zero padding apparatus and method for variable 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.