Layered Mobile Broadcast Encoding for VSB Noise Resistance
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Solution Overview
Problem
The Vestigial Sideband (VSB) transmission mode used in digital broadcasting in North America and Korea is prone to performance deterioration in poor channel environments, especially when using portable or mobile receivers, due to insufficient resistance to channel changes and noise.
Innovation Solution
A digital broadcasting system that includes a receiving system with a signal receiving unit, demodulating unit, demultiplexer, and decoder, which processes scalable video streams by performing additional encoding on mobile service data and inserting known data to enhance receiving performance, using a structure that includes MPH frames, VSB frames, and data groups to improve resistance to channel changes and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission mode is used for digital broadcasting, then the system is compatible with existing standards in North America and Korea, but the receiving performance deteriorates in poor channel environments and mobile conditions
Solution Approach 1:
The video data is divided into multiple layers (base layer and enhancement layers) with different identifiers, allowing the receiver to selectively decode based on channel conditions. This segmentation enables robust reception by prioritizing base layer data in poor conditions while allowing enhancement layers when conditions improve.
Solution Approach 2:
Known data is inserted in advance into predetermined regions within the data region before transmission. This preliminary placement of reference data enables the receiver to perform synchronization and channel estimation proactively, improving resistance to channel changes and noise.
2Object-affected harmful factors
If additional encoding is performed on mobile service data, then the resistance to channel changes and noise is improved, but the data processing complexity increases
Solution Approach 1:
The transmission system segments video data into multiple layers with different identifiers, applying different encoding strategies to each layer. This allows enhanced protection for critical base layer data while using lighter encoding for enhancement layers, managing complexity through selective processing.
Solution Approach 2:
The scalable video coding framework provides multi-functionality by enabling the same transmitted data to serve multiple purposes: base layer for basic reception, enhancement layers for improved quality, and known data regions for synchronization and channel estimation, all within a unified transmission structure.
Data Source
AI summary
A method of transmitting a broadcast signal includes encoding mobile service data to build a Reed-Solomon (RS) frame according to an RS frame mode, wherein the mobile service data is either a mobile service data of a base layer or a mobile service data of the base layer and at least one enhancement layer, wherein each layer is specified by a layer identifier, wherein a layer identifier value of the base layer is set to 0 and a layer identifier value of the at least one enhancement layer starts from 1; and encoding signaling data, wherein the signaling data includes fast information channel (FIC) data and transmission parameter channel (TPC) data, and the FIC data includes information for rapid mobile service acquisition.