Mobile Digital Broadcasting Signal Processing for Robust VSB 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, especially in mobile or portable receivers, due to vulnerability to channel variations and noise.
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 stream, and using a method that multiplexes and demultiplexes mobile and main service data, while incorporating error correction and interleaving techniques to improve robustness against channel changes.
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 due to channel variation and noise
Solution Approach 1:
The patent segments mobile service data from main service data, applying different encoding and modulation strategies to each. Mobile service data undergoes additional encoding processes and is placed in dedicated data regions, separating it from the main VSB transmission stream to improve robustness while maintaining overall system simplicity
Solution Approach 2:
The patent applies preliminary actions by inserting known data (pilot signals) into predetermined regions of the data stream before transmission. This allows the receiver to perform channel estimation and equalization in advance, compensating for channel variations and noise effects before the actual mobile service data is decoded
2Reliability
If additional encoding process is applied to mobile service data, then robustness against channel variation and noise improves, but data processing complexity increases
Solution Approach 1:
The patent applies local quality by implementing additional encoding processes specifically for mobile service data regions while leaving main service data unchanged. This targeted approach improves robustness for mobile data without unnecessarily complicating the processing of main service data, reducing overall system complexity
Solution Approach 2:
The patent applies partial action by performing additional encoding only on the mobile service data portion rather than the entire transmission stream. This selective processing provides enhanced robustness where needed while minimizing the increase in data processing complexity across the whole system
3Measurement precision
If known data is inserted into data region, then channel estimation accuracy improves, but data transmission efficiency decreases
Solution Approach 1:
The patent applies partial action by inserting known data only in predetermined regions of the data stream rather than throughout the entire transmission. This selective insertion provides sufficient channel estimation accuracy for mobile service data recovery while minimizing the overhead and preserving data transmission efficiency
Solution Approach 2:
The patent applies local quality by placing known data in specific predetermined regions where it is most needed for channel estimation, rather than uniformly distributing it. This targeted approach optimizes channel estimation accuracy for mobile service data while minimizing the impact on overall transmission efficiency
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.