Mobile Service Data Encoding for Robust VSB Broadcast Reception
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Solution Overview
Problem
Digital broadcasting systems using the vestigial sideband (VSB) transmission method face challenges in maintaining reception performance, especially 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 demultiplexing, decoding service guide information, and error correction encoding to improve robustness against channel variations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If VSB transmission method is used for mobile service data, then transmission simplicity is maintained, but reception performance deteriorates in mobile or portable broadcasting receivers due to channel variation and noise
Solution Approach 1:
The data transmission is segmented into main service data and mobile service data, with different encoding strategies applied to each. Mobile service data receives additional robustness encoding while main service data uses standard encoding, allowing differentiated treatment to optimize reception performance for mobile devices without affecting overall system complexity
Solution Approach 2:
The encoding parameters are changed specifically for mobile service data by inserting known data at predetermined intervals and applying additional encoding processes. This parameter modification enhances the robustness of mobile service data transmission against channel variations and noise while maintaining the simplicity of the base VSB transmission method
2Reliability
If additional encoding process is performed on mobile service data, then robustness against channel variation and noise is improved, but data processing complexity increases
Solution Approach 1:
Known data is inserted at predetermined intervals into the mobile service data stream before transmission. This preliminary action creates reference points that enable the receiver to synchronize and correct errors more effectively, improving robustness without requiring complex real-time processing during transmission
Solution Approach 2:
An additional encoding process acts as an intermediary between the mobile service data and the VSB modulation. This intermediary encoding layer provides error protection and robustness while keeping the core transmission system simple, as the additional encoding can be implemented as a separate processing stage
3Reliability
If known data is inserted into data region, then reception performance is improved through better synchronization and error correction, but data transmission efficiency decreases
Solution Approach 1:
Known data is inserted only in specific predetermined regions of the mobile service data stream, not throughout the entire transmission. This localized approach provides synchronization and error correction benefits where most needed (in mobile data regions) while minimizing the impact on overall data transmission efficiency by leaving other regions unaffected
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.