VSB Mobile Broadcast Framing for Error-Resilient Signal Recovery
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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 mobile service data is transmitted, and existing systems lack robustness against errors and compatibility with different protocol versions.
Innovation Solution
A digital broadcasting system that encodes mobile data for forward error correction, segments it into Reed-Solomon frames, and maps them to Serially Concatenated Convolutional Code blocks, allowing for scalable data transmission and accurate restoration of signaling information across subframes, ensuring compatibility and resilience to errors.
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
Solution Approach 1:
The FIC chunk is segmented into multiple FIC segments that can be transmitted across different subframes. This segmentation allows the system to maintain compatibility with conventional VSB transmission while improving reliability through distributed transmission of signaling information across multiple time slots, reducing the impact of channel errors on any single segment.
Solution Approach 2:
The FIC segments are transmitted in advance before the actual mobile service data, allowing the receiver to acquire service information and configure itself proactively. This preliminary action enables faster service acquisition and improves receiving performance by preparing the receiver before the actual data transmission begins.
2Device complexity
If FIC chunk is transmitted as a single unit, then simplicity is maintained, but data loss occurs when the chunk size exceeds or is less than subframe capacity
Solution Approach 1:
The FIC chunk is divided into multiple FIC segments that can be flexibly distributed across one or more subframes. Each segment is independently transmitted and can be reassembled at the receiver, ensuring complete data transmission regardless of subframe capacity variations and preventing data loss.
Solution Approach 2:
The system dynamically adjusts the number and distribution of FIC segments across subframes based on the actual data size and channel conditions. This dynamic segmentation allows the transmission structure to adapt to varying subframe capacities while maintaining simplicity through standardized segment formatting and assembly procedures.
3Quantity of substance
If protocol version information is not included in FIC segments, then transmission overhead is reduced, but accurate restoration becomes impossible when different protocol versions coexist
Solution Approach 1:
The protocol version information is extracted and placed in a dedicated header field within each FIC segment. This separation allows the version information to be efficiently transmitted without adding excessive overhead to the payload, while enabling the receiver to accurately identify and restore the complete FIC chunk even when multiple protocol versions are present in the transmission stream.
4Productivity
If additional mobile service data is transmitted without error correction, then transmission speed is increased, but error resilience deteriorates in poor channel conditions
Solution Approach 1:
Forward error correction codes are applied to mobile service data in advance before transmission. This preliminary encoding ensures that even when transmitted at high speeds without retransmission, the data maintains strong error resilience against channel impairments, as the correction capability is built into the transmitted signal itself.
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.