Digital Broadcasting Burst Structure for Mobile Data
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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 and method that involves comparing data rates between a service multiplexer and a transmitter, adjusting burst sizes or periods, and encoding mobile service data to enhance receiving performance, while matching data rates and inserting or removing null data to stabilize transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission mode is used for digital broadcasting, then system compatibility and standard adherence are maintained, but receiving performance deteriorates in poor channel environments
Solution Approach 1:
The transmission system is segmented into multiple parallel transmission paths: one for main service data using conventional VSB modulation and another for mobile service data using robust modulation schemes with additional encoding. This segmentation allows each path to be optimized for its specific requirements while maintaining overall system compatibility.
Solution Approach 2:
The invention changes key transmission parameters for mobile service data including modulation scheme (using more robust schemes), coding rate (with additional error correction encoding), and burst structure (with adjustable sizes and periods). These parameter changes enhance resistance to channel changes and noise while maintaining compatibility with the existing VSB framework.
2Reliability
If additional encoding is applied to mobile service data, then resistance to channel changes and noise improves, but data processing complexity increases
Solution Approach 1:
The encoding process is segmented and applied selectively only to mobile service data packets, not to all broadcast data. This targeted approach provides enhanced channel resistance where needed while avoiding unnecessary processing complexity for main service data that doesn't require the same level of protection.
Solution Approach 2:
The encoding parameters such as burst size and burst period are made dynamic and adjustable based on channel conditions and service requirements. This allows the system to adapt the level of encoding complexity to match actual needs, optimizing the balance between reliability and processing complexity.
3Stability of the object's composition
If data rate adjustment is performed to match service multiplexer and transmitter, then transmission stability improves, but system complexity increases
Solution Approach 1:
The data transmission is organized into periodic bursts with defined burst periods and burst sizes. This periodic structure naturally facilitates data rate matching between the service multiplexer and transmitter by providing regular synchronization points and predictable transmission patterns, reducing the complexity of rate adjustment mechanisms.
Solution Approach 2:
The burst size and burst period parameters are adjusted to match data rates between different system components. By changing these parameters rather than fundamentally altering the transmission architecture, the system achieves stable data rate matching with minimal added complexity.
Data Source
AI summary
A digital broadcasting system and a method of processing data are disclosed. Herein, additional encoding is performed on mobile service data, which are then transmitted, thereby providing robustness in the processed mobile service data, so that the mobile service data can respond more strongly against fast and frequent channel changes. In a transmitting system including a service multiplexer and a transmitter located in a remote site, a method of processing data of the transmitting system includes comparing an output data rate of the service multiplexer and a transmission data rate of the transmitter, when a difference occurs between the two data rates, adjusting a burst size, wherein the burst transmits mobile service data, and encoding the mobile service data, and referring to the burst size so as to multiplex main service data and the encoded mobile service data in a burst structure.