Multi-Turbo Stream Reception for ATSC Multipath Broadcasting
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Solution Overview
Problem
The U.S. terrestrial digital broadcasting system using the ATSC VSB scheme experiences poor reception performance in multipath channels, despite the addition of robust data streams, and is unable to adapt to enhanced broadcasting models utilizing multi-turbo streams.
Innovation Solution
A digital broadcasting transmission and reception system that processes and transmits multiple turbo streams, enhancing reception performance by interleaving and encoding these streams with normal data, and using parity bits for error correction, thereby improving compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single robust data stream is added to normal data in the existing ATSC VSB system, then error correction capability is improved, but reception performance in multipath channels deteriorates and the system cannot adapt to enhanced broadcasting models
Solution Approach 1:
The patent divides the single robust data stream into multiple turbo streams (first turbo stream and second turbo stream with different coding rates). This segmentation allows the system to provide multiple levels of error correction capability, enabling better adaptation to diverse channel conditions including multipath environments, while maintaining compatibility with existing ATSC VSB systems.
Solution Approach 2:
The patent introduces dynamic adaptability by enabling the receiver to selectively process different turbo streams based on channel conditions. The system can dynamically adjust which turbo stream to use (1/2 rate or 3/4 rate) depending on the reception environment, providing flexible adaptation to enhanced broadcasting models while maintaining reliable error correction.
2Adaptability or versatility
If multiple turbo streams with different coding rates are processed, then adaptability to enhanced broadcasting models is improved, but system complexity increases
Solution Approach 1:
The patent designs a universal processing framework where a single receiver architecture can handle multiple turbo streams with different coding rates. The turbo processor and deinterleaver are designed to universally process both 1/2 rate and 3/4 rate turbo streams, allowing the system to adapt to enhanced broadcasting models without requiring separate dedicated processing paths for each stream type.
Solution Approach 2:
The patent implements optional processing paths where the receiver can process only the necessary turbo streams based on channel conditions and service requirements. Not all turbo streams need to be processed in every reception scenario, allowing the system to reduce processing complexity when full multi-stream processing is not required while maintaining adaptability when needed.
Data Source
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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.