E8-VSB Reception Using Data Attributes for Stable Mixed-Rate Decoding
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Solution Overview
Problem
The existing ATSC 8VSB transmission system faces challenges in maintaining stable reception of both main data and enhanced data, particularly due to degradation in image quality and the need for additional transmission specifications that avoid interference with conventional signals, necessitating a system capable of decoding and identifying multiplexed main and enhanced data encoded at different coding rates.
Innovation Solution
The E8-VSB reception system employs a tuner, demodulating unit, map information restoring unit, data attribute generating unit, channel equalizing unit, and channel decoding unit to receive and decode main data and enhanced data encoded at different coding rates, using sync signals and data attribute information to distinguish and process ½ enhanced data, ¼ enhanced data, and main data, thereby enhancing reception stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If enhanced data is added to the conventional 8VSB system, then service functionality is improved, but reception stability deteriorates
Solution Approach 1:
The patent segments the transmission data into main data and enhanced data with different coding rates. Main data uses conventional coding for compatibility, while enhanced data uses higher coding rates for improved functionality. This segmentation allows the system to provide enhanced services while maintaining stable reception of core content through separate processing paths for different data types.
Solution Approach 2:
The patent applies different coding rates to different portions of the data stream. Critical main data receives robust coding for stable reception, while enhanced data portions use higher coding rates to enable additional services. This local differentiation of quality allows the system to optimize for both stability and functionality in different regions of the data stream.
2Adaptability or versatility
If different coding rates are used for main data and enhanced data, then data transmission flexibility is improved, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary actions by inserting synchronization signals and data attribute information before the actual data transmission. These preliminary elements provide the receiver with advance knowledge of the data structure, coding rates, and packet types, enabling the decoder to prepare appropriate processing paths and reducing the complexity of real-time decoding by having the structure predetermined.
Solution Approach 2:
The patent introduces data attribute information as an intermediary that carries metadata about the encoded data. This intermediary layer provides the receiver with information about coding rates, packet types, and data characteristics without requiring complex analysis of the encoded data itself, thereby simplifying the decoding process while maintaining flexibility.
3Measurement precision
If data attribute information is generated to identify multiplexed data, then data identification accuracy is improved, but processing overhead increases
Solution Approach 1:
The patent changes the parameter representation by using compact data attribute information fields that encode multiple pieces of identification information in a condensed format. Rather than using separate identification fields for each data characteristic, the system uses parameter encoding to represent coding rates, packet types, and data attributes in a space-efficient manner, improving identification accuracy while minimizing overhead.
Data Source
AI summary
An E8-VSB reception system, apparatus for generating data attribute and method thereof, and apparatus for channel encoding and method thereof are disclosed. In the present invention, E8-VSB data resulting from multiplexing a plurality of enhanced data encoded at different coding rates with main data is received. And, the main data and a plurality of the enhanced data are identified to be modulated from the received E8-VSB data. In particular, by generating M/E packet attribute information, enhanced packet attribute information, enhanced byte attribute information and E8-VSB symbol attribute information from the E8-VSB data attribute generating apparatus, the channel decoding apparatus can correctly identify to decode the main data, ½ enhanced data and ¼ enhanced data from one another.