VSB Broadcast Frame Structure for Stable Mobile Service Reception
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Solution Overview
Problem
Digital broadcasting systems using the vestigial sideband (VSB) transmission method in North America and Korea face challenges with reception performance, particularly in mobile or portable receivers due to channel variations and noise, which deteriorate the reception of mobile service data.
Innovation Solution
A digital broadcasting system that enhances reception performance by performing additional encoding on mobile service data, inserting known data into specific regions of the data frame, and using a method that includes demodulating, decoding service guide information, and multiplexing program table information with mobile and main service data to improve robustness against channel variations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission method is used for digital broadcasting, then transmission compatibility is maintained, but reception performance deteriorates in mobile or portable conditions due to channel variations and noise
Solution Approach 1:
The patent applies preliminary action by inserting known data (training sequences) into the transmitted signal before transmission. These known data are placed in advance in specific positions within the data frames, allowing the receiver to perform channel estimation and equalization before actual data reception, thereby improving reception performance in mobile conditions without changing the VSB modulation method itself.
2Reliability
If additional encoding process is applied to mobile service data, then robustness against channel variation and noise improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by selectively applying additional encoding processes only to mobile service data portions within the data frame, rather than encoding the entire broadcast signal. The known data are inserted specifically in regions allocated for mobile service data, providing enhanced robustness only where needed for mobile reception while leaving main service data transmission unchanged, thus limiting the increase in device complexity.
Data Source
AI summary
The present invention relates to a digital broadcasting system for transmitting/receiving a digital broadcasting signal and a method of processing data. In one aspect of the present invention provides a method of processing data, the method including receiving a broadcasting signal in which mobile service data and main service data are multiplexed, demodulating the received broadcasting signal, obtaining an identifier indicating that data frame of the broadcasting signal includes service guide information, decoding and storing the service guide information from the data frame; and outputting a service included in the mobile service data according to the decoded service guide information.