Cable Broadcast L1 Signaling with BCH-LDPC Puncturing
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Solution Overview
Problem
Current digital broadcasting technologies, such as DVB-C2, face limitations in data transmission efficiency and error correction capabilities, particularly with increased data sizes and channel numbers, which affect the quality of video and audio signals.
Innovation Solution
A transmitter and receiver system utilizing BCH and LDPC encoding, puncturing, bit interleaving, and QAM mapping to enhance data transmission efficiency and error correction, specifically processing Layer 1 signaling data with PSI/SI reprocessing information for Physical Layer Pipes (PLPs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DVB-C2 uses LDPC and BCH codes with bit-interleaving schemes, then error correction capability is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments Layer 1 signaling data from service data and processes them through different encoding paths. Layer 1 signaling data undergoes BCH encoding followed by LDPC encoding with puncturing, while service data uses standard LDPC encoding. This segmentation allows optimized error correction for signaling data without compromising overall transmission efficiency.
Solution Approach 2:
The patent applies different encoding schemes to different parts of the data stream. Specifically, Layer 1 signaling data receives enhanced protection with both BCH and LDPC codes, while service data uses standard LDPC coding. This local differentiation of quality ensures critical signaling information gets superior error correction while maintaining efficiency for bulk data transmission.
2Adaptability or versatility
If the number of broadcasting channels and data size increase, then service capability is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic puncturing of LDPC parity bits for Layer 1 signaling data based on channel conditions and data requirements. The puncturing pattern can be adjusted to balance between error correction capability and transmission efficiency, allowing the system to adapt to varying service capabilities while optimizing data transmission for each specific scenario.
Solution Approach 2:
The patent changes encoding parameters specifically for Layer 1 signaling data by applying BCH encoding before LDPC encoding and using selective puncturing. This parameter modification for critical signaling data enables the system to support more broadcasting channels and larger data sizes while maintaining overall transmission efficiency through optimized resource allocation.
3Productivity
If puncturing is applied to LDPC parity bits, then data transmission efficiency is improved, but error correction capability deteriorates
Solution Approach 1:
The patent applies BCH encoding as a preliminary error correction layer before LDPC encoding and puncturing. This preliminary action provides a foundation of error protection that compensates for the error correction capability loss due to subsequent puncturing of LDPC parity bits, allowing efficient transmission without sacrificing reliability.
Solution Approach 2:
The patent creates a composite error correction structure by combining BCH codes and LDPC codes with puncturing. This composite approach uses the strengths of both coding schemes - BCH for preliminary protection and punctured LDPC for efficient transmission - to achieve both high data transmission efficiency and maintained error correction capability simultaneously.
Data Source
AI summary
The present invention relates to a method of transmitting and a method of receiving signals and corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.