LDPC Zero Padding for Fixed-Length Signaling Robustness
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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
A zero padding technique is introduced, where a processor generates an LDPC information bit string by deciding groups to be filled with zeros based on the difference between the LDPC and BCH-encoded bit string lengths, using a shortening pattern order, and filling remaining groups with the BCH-encoded bit string, optimizing shortening and puncturing according to the amount of signaling information in Bit-Interleaved Coded Modulation (BICM) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding and modulation techniques are used for signaling information, then the transmission can be performed with existing systems, but the robustness and efficiency of signaling information transmission is insufficient
Solution Approach 1:
The patent changes the parameters of the encoding system by introducing zero padding to LDPC codes and optimizing shortening patterns specifically for signaling information. This involves modifying the code length, padding position, and shortening pattern to achieve better error correction performance tailored to signaling information characteristics, thereby improving robustness while maintaining adaptability.
2Reliability
If zero padding is applied to LDPC codes for signaling information, then the error correction performance is improved, but the complexity of the encoding process increases
Solution Approach 1:
The patent applies zero padding in advance during the LDPC encoding process for signaling information. By pre-determining the padding positions and patterns based on the difference between LDPC code length and BCH-encoded signaling information length, the system improves error correction performance without requiring complex real-time adjustments, thus managing complexity effectively.
3Productivity
If the LDPC information bit string length is adjusted to match BCH-encoded bit string length, then the encoding efficiency is improved, but the flexibility in handling different signaling information lengths is reduced
Solution Approach 1:
The patent employs dynamic zero padding where the number and position of padded zeros are adjusted based on the actual length of the BCH-encoded signaling information. This dynamic adjustment allows the system to efficiently handle variable-length signaling information while maintaining optimal encoding efficiency by matching the LDPC information bit string length to the input signal characteristics.
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.