ATSC Dual Transport Stream Processing for Multi-Turbo Reception
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Solution Overview
Problem
The U.S.A. terrestrial digital broadcasting system using the ATSC VSB scheme experiences poor reception performance in multipath channels, and the existing dual stream transmission with added robust data does not significantly improve reception, especially when only processing one robust stream at a time, limiting its adaptability to enhanced broadcasting models involving multi-turbo streams.
Innovation Solution
A digital broadcasting transmission and reception system that processes and transmits multiple turbo streams by detecting and encoding them within a dual transport stream, allowing for trellis-encoding and parallel decoding of both normal and turbo streams, thereby enhancing reception performance in multipath environments and supporting multi-turbo stream broadcasting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single carrier and field sync signal of 312 segments are used in ATSC VSB scheme, then the system maintains compatibility with existing standards, but reception performance deteriorates in poor channel conditions such as doppler fading
Solution Approach 1:
The patent segments the transport stream into multiple turbo streams, each processed independently through separate encoding and modulation paths. This allows the system to handle multiple data streams with different robustness requirements simultaneously, improving reception performance in diverse channel conditions while maintaining compatibility with existing ATSC VSB infrastructure
Solution Approach 2:
The patent implements a multi-functional transmission system that can process both normal streams and multiple turbo streams through the same ATSC VSB infrastructure. The system universally handles different stream types with different coding schemes, enabling backward compatibility while supporting enhanced broadcasting models with multi-turbo streams
2Reliability
If dual stream transmission with added robust data is implemented, then some error correction capability is provided, but reception performance does not significantly improve in multipath channels when only one robust stream is processed
Solution Approach 1:
The patent divides the dual stream into separate processing paths, with each turbo stream undergoing independent encoding, interleaving, and modulation. This segmentation allows the system to optimize each stream for different channel conditions without creating a single complex processing path, thereby improving signal reliability while managing system complexity through modular design
Solution Approach 2:
The patent combines multiple independently processed turbo streams into a single composite signal for transmission over the ATSC VSB channel. The receiver separates and decodes these streams independently, achieving improved reliability through diversity while maintaining manageable system complexity through parallel processing architecture
Data Source
AI summary
A digital broadcasting transmission system processes dual transport stream (TS) including multi turbo streams. The digital broadcasting transmission system includes a turbo processor to detect a turbo stream from a dual transport stream (TS) which includes a multiplexed normal stream and a turbo stream, encoding the detected turbo stream and stuffing the encoded turbo stream into the dual TS; and a transmitter to trellis-encode the processed dual TS, and to output the resultant stream, wherein the turbo processor encodes the turbo stream using a plurality of turbo processors. Accordingly, a plurality of turbo streams may be processed in parallel.