Digital Broadcast Receiver RS Framing for Mobile VSB Reception
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, due to inadequate resistance to channel changes and noise.
Innovation Solution
A digital broadcasting receiver and method that processes mobile service data and main service data by using Reed Solomon (RS) frames, which include signaling information and error correction, to enhance reception stability and accuracy, particularly in mobile environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VSB transmission mode is used for digital broadcasting, then the system can maintain compatibility with existing standards and infrastructure, but receiving performance deteriorates in poor channel environments and mobile conditions
Solution Approach 1:
The patent segments mobile service data into separate Reed Solomon frames with dedicated signaling information zones, distinct from main service data. This segmentation allows independent error correction and processing of mobile service data, improving reliability without affecting main service data transmission that uses conventional VSB methods.
Solution Approach 2:
The patent introduces Reed Solomon coding as an intermediary layer between the VSB transmission mode and mobile service data. This intermediary provides enhanced error correction capabilities specifically for mobile service data while maintaining compatibility with the existing VSB framework for main service data.
2Device complexity
If conventional VSB transmission is used for mobile service data, then the system structure remains simple, but resistance to channel changes and noise is insufficient
Solution Approach 1:
The patent changes the coding parameters for mobile service data by applying Reed Solomon coding with specific frame structures, signaling information zones, and error correction codes. This parameter change enhances noise and channel change resistance while maintaining a relatively simple system structure through standardized processing steps.
3Reliability
If Reed Solomon frames with signaling information are used for mobile service data, then error correction and reception stability improve, but data processing complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-structuring Reed Solomon frames with dedicated signaling information zones and known data sequences before transmission. This preliminary organization simplifies the receiving process by providing clear markers and structures for error detection and correction, reducing the complexity of real-time processing.
Solution Approach 2:
The patent implements self-service mechanisms through automatic signal detection, synchronization, and error correction using the embedded signaling information and known data sequences within the Reed Solomon frames. The system automatically identifies and corrects errors without requiring complex external intervention, improving reception stability while managing processing complexity.
Data Source
AI summary
A method includes performing Reed Solomon (RS) and Cyclic Redundancy Check encoding on mobile data and a table including access information of the data and information identifying a stream where data decryption keys are obtained, thereby forming an RS frame, which is divided into groups. Each group includes a portion of the RS frame data, known data sequences, fast information channel (FIC) data, and transmission parameter channel (TPC) data. The FIC data includes information for rapid mobile service acquisition. The TPC data includes information for indicating an FIC data update. A broadcast signal including the groups is transmitted. The RS frame size is L (rows)×N (column size of the RS frame) bytes. Each row has an M-byte header, leaving the remainder available for data. Data in the rows are packed into the rows end-to-end, with possible wrapping around at the end of each row to the next row.