L1 Post Signaling Bit Mapping for LDPC Broadcast Transmitters
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Solution Overview
Problem
Current digital broadcasting systems, such as DVB-T2, face challenges in providing high-performance services due to limitations in error correction and detection performance of L1 post signaling, which affects the quality of digital television and multimedia services.
Innovation Solution
A transmitter and signal processing method that employs Low Density Parity Check (LDPC) encoding, demultiplexing, and modulation to map specific bits of L1 signaling onto specific locations of modulation symbols, optimizing error correction and detection performance by using a parity check matrix with defined column groups and sub streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional error correction methods are used for L1 post signaling, then the system maintains simplicity, but error correction and detection performance is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of error correction by transitioning from conventional methods to LDPC (Low-Density Parity-Check) encoding. This parameter change enables superior error correction and detection performance for L1 post signaling while maintaining system through the use of standardized LDPC codes and systematic processing procedures.
2Measurement precision
If L1 post signaling is processed without demultiplexing, then the processing is simpler, but detection performance of specific bits is degraded
Solution Approach 1:
The patent applies segmentation by demultiplexing the LDPC-encoded L1 post signaling into multiple sub-streams. This segmentation allows specific bits to be mapped to specific locations of modulation symbols, thereby improving detection performance through structured organization while managing complexity through systematic demultiplexing procedures.
Solution Approach 2:
The patent implements local quality by mapping specific bits to specific locations of modulation symbols after demultiplexing. This localized optimization ensures that critical bits are placed in positions with better detection performance, thereby enhancing overall signaling reliability through position-specific bit allocation.
Data Source
AI summary
A transmitter, a receiver and methods of controlling the transmitter and the receiver are provided. The transmitter includes: a Low Density Parity Check (LDPC) encoder configured to generate an LDPC codeword by performing LDPC encoding on an L1 post signaling; a demux configured to demultiplex a plurality of bits constituting the L1 post signaling of the LDPC codeword; and a modulator configured to modulate the demultiplexed bits.