Turbo Processing Digital Broadcasting Transport Stream
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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 normal data and turbo data, using a dual transport stream system with information exchange and mapping, which enhances reception performance by convolution encoding and interleaving the turbo stream, and inserting parity bytes for error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ATSC VSB system transmits normal data and enhanced data using standard error correction, then system compatibility is maintained, 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 receives different error correction treatments tailored to its requirements. The normal data stream uses conventional RS and trellis encoding, while the turbo data stream employs turbo encoding with iterative decoding, allowing optimized error correction for challenging channel conditions without affecting the overall system compatibility.
Solution Approach 2:
The system changes the error correction parameters by introducing turbo coding with specific encoder configurations (interleaver depth, component convolutional codes) for the turbo data stream. The receiver adapts by using iterative maximum a posteriori probability (MAP) decoding with adjusted stopping criteria and threshold parameters, enabling improved reception performance under varying channel conditions while maintaining compatibility with standard ATSC VSB transmission.
2Reliability
If turbo encoding is applied to enhance error correction, then reception performance improves, but system complexity increases
Solution Approach 1:
The error correction system is segmented into two parallel paths: a conventional path for normal data and an advanced turbo coding path for turbo data. This segmentation allows the complex turbo encoding and decoding operations to be applied only where needed (for enhanced reliability requirements) rather than to all data streams, thereby managing overall system complexity while achieving improved error correction for critical data.
Solution Approach 2:
An intermediary processing stage is introduced in the receiver that performs iterative MAP decoding between the turbo decoder and deinterleaver. This intermediary iterative process with adjustable stopping criteria acts as a mediator that gradually refines the decoding results, achieving high error correction performance while allowing control over the computational complexity through the stopping criterion parameters.
3Reliability
If dual transport stream with turbo data is transmitted, then reception performance under multipath conditions improves, but data structure complexity increases
Solution Approach 1:
The dual transport stream structure is segmented with clear identification fields that distinguish normal data packets from turbo data packets. Each packet type has dedicated error correction processing paths, simplifying the overall data structure management despite the presence of two streams. The receiver uses packet type identification to route data through appropriate decoding paths, managing structural complexity through systematic organization.
Solution Approach 2:
The transmission system is designed with universal compatibility, where the dual transport stream structure can accommodate both normal and turbo data using the same physical layer modulation and basic transmission framework. The ATSC VSB modulation and basic packet structure remain universal, while the error correction layer provides multi-functionality by supporting both conventional and turbo coding schemes within the same system infrastructure.
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.