Mobile Broadcast Signal Framing for Robust VSB Reception
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Solution Overview
Problem
The Vestigial Sideband (VSB) transmission mode used in digital broadcasting in North America and Korea is prone to performance deterioration in poor channel environments, especially when using portable or mobile receivers, and struggles with noise resistance and error resilience for mobile service data transmission.
Innovation Solution
A digital broadcasting system that encodes mobile data for forward error correction (FEC) using Reed-Solomon frames, divides them into Serially Concatenated Convolutional Code (SCCC) blocks, and maps these blocks to data segments, including scalable data blocks, to ensure robust transmission and reception of mobile service data, even in poor channel conditions, by segmenting Fast Information Channel (FIC) chunks and transmitting them through multiple subframes with protocol version and signaling information headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VSB transmission mode is used for digital broadcasting, then compatibility with conventional systems is maintained, but receiving performance deteriorates in poor channel environments and mobile service data transmission becomes unreliable
Solution Approach 1:
The patent segments mobile service data into multiple data groups, each with different error correction codes and transmission priorities. This allows the system to maintain compatibility with conventional VSB receivers while providing enhanced reliability for mobile service data through selective segmentation and differential encoding schemes.
2Quantity of substance
If additional mobile service data is transmitted, then service functionality is enhanced, but error resilience in noisy channels deteriorates
Solution Approach 1:
The patent applies different error correction codes and protection mechanisms to different portions of mobile service data based on their importance and service requirements. Critical service data receives stronger error correction while less critical data uses lighter protection, optimizing the balance between data quantity and error resilience.
3Device complexity
If FIC chunk is transmitted as a single unit, then transmission simplicity is maintained, but data loss occurs when error affects the entire chunk
Solution Approach 1:
The FIC chunk is divided into multiple segments that are transmitted separately with individual error protection. This segmentation allows the receiver to reconstruct the complete FIC information even if some segments are corrupted during transmission, significantly improving data integrity while maintaining manageable complexity.
4Loss of time
If fast service acquisition is implemented, then service setup time is reduced, but signaling complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring service information and transmission parameters in the FIC chunk before actual service data transmission. This allows receivers to acquire service information quickly without complex real-time signaling, reducing service acquisition time while managing complexity through advance preparation.
Data Source
AI summary
Methods and apparatus for transmitting and receiving broadcast signals are provided. The method for transmitting a broadcast signal includes encoding mobile data for forward error correction (FEC), encoding signaling data, forming data groups including the encoded mobile data and the encoded signaling data and transmitting a signal frame that includes the data groups.