Multi-Transport Stream Multiplexing for Variable-Rate Turbo Broadcasts
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Solution Overview
Problem
Conventional ATSC VSB digital broadcast systems face challenges in transmitting and receiving dual transport streams with normal and turbo data of various coding rates, leading to degraded reception in poor channel conditions like Doppler fading channels, and high power consumption in receiving devices.
Innovation Solution
A digital broadcast system that generates and transmits multi-transport streams by multiplexing normal and turbo streams with variable coding rates, using a Reed-Solomon encoder, duplicator, and multiplexer to prepare parity insertion regions, and includes processors to re-construct and decode the streams, reducing power consumption by processing turbo streams in turbo units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual transport streams with normal and turbo data of various coding rates are transmitted in conventional ATSC VSB systems, then system versatility is improved, but reception reliability deteriorates in poor channel conditions
Solution Approach 1:
The transport stream is segmented into turbo units with fixed packet counts (52, 104, 156, or 208 packets) based on coding rates. Each turbo unit is processed independently through dedicated turbo processors, allowing the system to adapt to different coding rates while maintaining reliable reception through structured segmentation and systematic error correction.
2Quantity of substance
If dual transport streams are multiplexed and transmitted, then information quantity is improved, but device complexity increases
Solution Approach 1:
The complex dual transport stream processing is divided into manageable turbo units with fixed packet counts. Each unit is handled by dedicated turbo processors that perform systematic operations (extracting turbo packets, error correction, reinsertion), reducing overall processing complexity while maintaining high data capacity.
Solution Approach 2:
Turbo packets are pre-positioned at fixed intervals within each turbo unit before transmission. The receiving device performs preliminary extraction of these pre-positioned packets and applies error correction in advance, simplifying the overall processing workflow and reducing computational burden.
3Quantity of substance
If conventional dual TS processing is performed, then normal data transmission is maintained, but power consumption increases
Solution Approach 1:
The receiving device processes only specific turbo units containing desired data rather than continuously processing all transport streams. By segmenting processing into discrete turbo units with fixed packet counts, the device can enter low-power states between processing cycles, significantly reducing overall power consumption while maintaining data transmission capability.
Data Source
AI summary
A transport stream (TS) generating apparatus, a transmitting apparatus, a receiving apparatus, a digital broadcast system having the above, and a method thereof are provided. The digital broadcast system includes a transport stream (TS) generating apparatus which generates a multi transport stream (TS) by multiplexing a normal stream and a turbo stream having a variable coding rate, a transmitting apparatus which re-constructs the multi TS by processing the turbo stream, and transmits the re-constructed multi TS, and a receiving apparatus which receives the re-constructed multi TS, and decodes the normal stream and the turbo stream respectively, to recover normal data and turbo data. Accordingly, a multi TS, which includes normal stream and a turbo stream of various coding rates, can be transmitted and received efficiently.