Broadcast Multiplexing Layout for Mobile VSB Reception Stability
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Solution Overview
Problem
The Vestigial Sideband (VSB) transmission method used in digital broadcasting 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 enhance receiving performance by additional encoding of mobile service data, multiplexing with main service data in burst units, and adjusting the position of audio data packets to mitigate packet jitter and improve noise resistance, using a service multiplexer and transmitter with demultiplexing, packet jitter mitigation, and pre-processing for error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission method is used for digital broadcasting, then system compatibility and simplicity are maintained, but receiving performance deteriorates in poor channel environments and mobile conditions
Solution Approach 1:
The transmission system segments data into different service types (main service and mobile service) and applies different encoding strategies to each. Mobile service data undergoes additional encoding specifically designed to withstand channel changes and noise, while main service data uses standard encoding. This segmentation allows tailored error protection for mobile receivers without affecting overall system compatibility.
Solution Approach 2:
The system performs preliminary encoding on mobile service data before transmission, adding redundant information that enables receivers to reconstruct data even when subjected to channel variations and noise. This pre-processing includes creating multiple versions or parity information that activates only when reception conditions are poor, thereby preventing performance deterioration before it occurs.
2Reliability
If additional encoding is applied to mobile service data, then noise resistance and channel change resistance improve, but system complexity increases
Solution Approach 1:
Additional encoding is applied selectively only to mobile service data packets, not to all broadcast data. The system identifies mobile service data through specific packet identifiers and applies enhanced error protection only where needed, maintaining standard encoding for main service data. This localized approach improves noise resistance for mobile receivers while minimizing overall system complexity.
Solution Approach 2:
The additional encoding mechanism serves multiple functions: it provides error correction for mobile service data, maintains compatibility with existing VSB transmission infrastructure, and can be activated or deactivated based on receiver type without requiring separate transmission systems. This multi-functionality reduces the need for separate complex systems for different service types.
3Stability of the object's composition
If packet position re-adjustment is performed to mitigate jitter, then receiving stability improves, but data processing time increases
Solution Approach 1:
The system performs packet position re-adjustment and jitter mitigation in advance, during the data preparation phase before transmission. By pre-positioning packets to account for expected jitter patterns and pre-assembling data groups with proper sequencing, the receiving end can process data more efficiently without requiring extensive real-time reordering operations, thus reducing overall processing time while maintaining stability.
Data Source
AI summary
A digital broadcasting system and method of processing data are disclosed. Herein, a method of processing data in a transmitting system includes creating a data group including a plurality of mobile service data packets, re-adjusting a relative position of at least one main service data packet of a main service data section, the main service data section including a plurality of main service data packets, and multiplexing the mobile service data of the data group and the main service data of the main service data section in burst units. Herein, a position of an audio data packet among the main service data packets of the main service data section may be re-adjusted. Also, a position of an audio data packet included in the main service data section may be re-adjusted based upon a multiplexing position of the main service data section.