LDPC Frame Mapping for Shaping Gain Across 16k and 64k Modes
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Solution Overview
Problem
The DVB-NGH system faces challenges in achieving maximum shaping gain due to the direct adaptation of non-uniform mapping patterns from DVB-T2 systems, particularly with the 64k mode, L1 signaling information, and MIMO profiles, which results in suboptimal error correction capabilities and increased C/N ratios.
Innovation Solution
A transmission device and method that selectively maps error correction coded frames in non-uniform patterns based on predetermined bit lengths, even when coding rates are identical, allowing for efficient shaping gain optimization by defining distinct non-uniform mapping patterns for different LDPC code lengths and transmission systems like SISO, MISO, and MIMO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-uniform mapping patterns from DVB-T2 systems are directly adapted to DVB-NGH systems, then implementation simplicity is improved, but shaping gain and error correction capabilities deteriorate
Solution Approach 1:
The patent applies local quality by defining different non-uniform mapping patterns tailored to specific DVB-NGH transmission scenarios (64k mode, L1 signaling information, MIMO profiles) rather than using a universal mapping pattern. Each scenario receives optimized mapping characteristics appropriate to its specific requirements, thereby achieving both implementation feasibility and improved error correction capabilities.
Solution Approach 2:
The patent changes the mapping pattern parameters specifically for DVB-NGH systems, defining new non-uniform mapping patterns that differ from DVB-T2 patterns. This parameter change enables optimization of shaping gain and error correction performance while maintaining the non-uniform mapping approach, resolving the contradiction between implementation simplicity and performance.
2Device complexity
If identical coding rates use the same non-uniform mapping pattern, then system complexity is reduced, but shaping gain optimization is limited
Solution Approach 1:
The patent implements local quality by introducing scenario-specific non-uniform mapping patterns even when coding rates are identical. Different transmission scenarios (64k mode, L1 signaling, MIMO) receive customized mapping patterns optimized for their specific characteristics, enabling shaping gain optimization without significantly increasing system complexity through selective differentiation.
Data Source
AI summary
An FEC coder in a transmission device according to an exemplary embodiment of the present disclosure performs BCH coding and LDPC coding based on whether a code length of the LDPC coding is a 16k mode or a 64k mode. A mapper performs mapping in an I-Q coordinate to perform conversion into an FEC block, and outputs pieces of mapping data (cells). The mapper defines different non-uniform mapping patterns with respect to different code lengths even an identical coding rate is used by the FEC coder. This configuration improves a shaping gain for different error correction code lengths in a transmission technology in which modulation of the non-uniform mapping pattern is used.