Broadcast Multiplexing Layout for Robust Mobile VSB Reception
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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, re-adjusting the position of main service data packets, and multiplexing them with mobile service data in burst units, using a service multiplexer and transmitter with components like demultiplexers, packet jitter mitigators, and preprocessors to mitigate packet jitter and improve noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission method is used for digital broadcasting, then system compatibility and standard adherence 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) with different encoding strategies. Mobile service data packets are separately identified and subjected to additional encoding processing, while main service data follows standard VSB transmission, thus resolving the contradiction between maintaining standard compatibility and improving mobile receiving performance
Solution Approach 2:
The system performs preliminary identification and separation of mobile service data packets before transmission. By pre-marking these packets with specific identifiers and applying additional encoding in advance, the receiving system can efficiently process mobile data with enhanced robustness against channel changes and noise
2Reliability
If additional encoding is performed on mobile service data, then noise resistance and channel change resistance improve, but system complexity increases
Solution Approach 1:
Instead of applying additional encoding to all data, the system applies it locally only to mobile service data packets identified by specific markers. This localized approach enhances noise resistance for mobile services while minimizing the increase in overall system complexity by limiting the additional processing to specific data streams
3Productivity
If mobile service data is multiplexed with main service data in burst units, then transmission efficiency improves, but packet jitter increases
Solution Approach 1:
The system introduces an intermediary identification marker that distinguishes mobile service data packets from main service data packets within the multiplexed burst units. This intermediary element enables the receiving system to correctly identify and process mobile packets even when their positions vary due to multiplexing, thus maintaining transmission efficiency while managing packet jitter through proper packet reassembly
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.