Robust Stream Coding for Dual Transport Broadcast Reception
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Solution Overview
Problem
The Advanced Television Systems Committee (ATSC) VSB scheme experiences poor reception performance in Doppler fading channels, and existing dual transport stream systems require complex receiver structures to improve robust stream reception.
Innovation Solution
A digital broadcasting transmission apparatus with a robust processor that separates and codes a dual transport stream, using a demultiplexer to separate normal and robust streams, appending parity with a Recursive Systematic Code (RSC) encoder, and interleaving the robust stream, while maintaining compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual transport stream scheme with robust coding is implemented to improve reception performance in poor channel environments, then reception quality is improved, but receiver structure complexity increases
Solution Approach 1:
The robust processor segments the dual transport stream into normal stream and robust stream components, processing them separately through dedicated demultiplexing and multiplexing paths. This segmentation allows the receiver to handle robust and normal streams independently, reducing overall processing complexity while maintaining improved reception performance through targeted robust coding application
Solution Approach 2:
The robust processor acts as an intermediary component between the transport stream input and output, inserting robust coding operations at a specific point in the signal chain. By positioning the robust processor as an intermediate stage with controlled input and output interfaces, the system integrates robust coding functionality without requiring complete receiver redesign, thus limiting complexity increase
2Reliability
If robust coding is added to improve stream robustness, then robust stream performance is enhanced, but system complexity increases due to additional encoding/decoding components
Solution Approach 1:
The robust processor merges the robust stream processing functions (demultiplexing, robust encoding, interleaving, multiplexing) into a single integrated component that operates within the existing transmission apparatus framework. This merging consolidates multiple operations into one modular unit, enhancing robust stream performance while containing the increase in system complexity through functional integration
Solution Approach 2:
The robust processor is designed as a multi-functional component that can handle both normal stream passthrough and robust stream processing simultaneously. By making the robust processor universal—capable of operating with or without robust coding activation—the system achieves enhanced robust performance when needed while avoiding dedicated separate decoding paths, thus limiting complexity increases
Data Source
AI summary
A digital broadcasting transmission apparatus and robust stream coding method thereof. The digital broadcasting transmission apparatus includes a robust processor that codes a robust stream of a dual transport stream where a normal stream and the robust stream are combined. The robust processor includes a demultiplexer (DE-MUX) that separates the normal stream and the robust stream from the dual transport stream; a robust encoder that appends a parity to the separated robust stream; a robust interleaver that interleaves the robust stream having the appended parity; and a MUX that combines the interleaved robust stream and the separated normal stream. Accordingly, a receiver of a simple structure can be provided.