Dual Transport Stream Turbo Coding for Weak-Channel ATSC Reception
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Solution Overview
Problem
The Advanced Television Systems Committee (ATSC) vestigial sideband (VSB) transmission system for terrestrial-wave digital television in the U.S. experiences inferior reception performance, especially over weak channels and Doppler-fading channels, due to inadequate error correction for normal data and enhanced data streams.
Innovation Solution
A method for turbo processing and transmitting a digital broadcasting transport stream that includes both normal data and turbo data, using a dual transport stream system with turbo processing units that convolution-encode and interleave the turbo stream, enhancing error correction and reception performance by integrating turbo data with normal data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-carrier ATSC VSB system transmits one field synchronization segment for each unit of 312 data segments, then the system maintains compatibility with existing transmission standards, but reception performance deteriorates over weak channels and Doppler-fading channels
Solution Approach 1:
The transport stream is segmented into two separate streams: normal data stream and turbo data stream. Each stream is independently encoded and transmitted, allowing the system to maintain compatibility with existing ATSC VSB receivers (normal stream) while providing enhanced reception performance through turbo coding (turbo stream). The segmentation enables dual functionality within a single transmission framework.
Solution Approach 2:
The system combines two different coding approaches (conventional coding for normal data and turbo coding for enhanced data) into a composite transmission system. This composite structure allows the transmission system to provide both legacy compatibility and improved performance characteristics, effectively creating a hybrid solution that leverages the strengths of both coding methods.
2Device complexity
If conventional error correction encoding is used for normal data stream, then the system maintains simplicity and compatibility, but error correction capability is insufficient for enhanced reception performance
Solution Approach 1:
The error correction encoding is segmented into two paths: conventional encoding for normal data maintaining simplicity and compatibility, and turbo encoding for enhanced data providing superior error correction. This segmentation allows the system to offer enhanced performance without forcing all users to adopt complex systems, as legacy receivers can still use the simple conventional encoding path.
Solution Approach 2:
The system changes the encoding parameter (coding scheme) based on the data stream type. Normal data uses conventional encoding parameters while turbo data uses advanced turbo coding parameters. This parameter differentiation enables the system to provide enhanced error correction capability where needed while maintaining simplicity for standard applications.
3Reliability
If a dual stream system transmits both normal data and enhanced data on one channel, then reception performance can be improved, but system complexity increases
Solution Approach 1:
The transmission system is designed with multi-functionality to handle both normal and turbo encoded streams through a unified ATSC VSB transmission framework. The same physical transmission infrastructure supports both coding schemes, and receivers can be configured to process either or both streams, reducing the need for entirely separate transmission systems.
Solution Approach 2:
The system introduces an intermediary layer (the dual stream multiplexing and demultiplexing structure) that manages the complexity of handling two different data streams. This intermediary framework provides standardized interfaces and processing routines that simplify the integration of different coding schemes within the transmission and reception systems.
Data Source
AI summary
A digital broadcasting transmission/reception system, and a signal processing method thereof for turbo-processing digital broadcasting transport stream and transmitting the processed stream, includes a parity area generating unit preparing a first area for parity insertion with respect to a dual transport stream (TS) which includes a normal stream and a turbo stream as multiplexed, a first interleaver interleaving the dual TS which is transmitted from the parity area generating unit, a turbo processing unit detecting the turbo stream from the interleaved dual TS, exclusively encoding the detected turbo stream for turbo-processing, and stuffing the encoded turbo stream into the dual TS, a deinterleaver deinterleaving the dual TS which is processed by the turbo processing unit, and a transmitting unit transmitting the dual TS which is processed at the deinterleaver.