Digital Broadcasting Stuff Byte Replacement for Multipath Reception
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Solution Overview
Problem
The existing U.S-oriented terrestrial waves digital broadcasting system, particularly the ATSC VSB system, experiences poor transmission performance in multipath channels despite dual stream transmission with robust data, which does not significantly improve the reception of normal streams.
Innovation Solution
A digital broadcasting transmitter replaces stuff bytes in the dual stream with predefined known data, processed through a robust data pre-processor, RS encoder, interleaver, symbol processor, and Trellis encoder, and a corresponding digital broadcasting receiver detects and uses this known data to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual stream transmission with robust data is implemented, then transmission reliability is improved, but reception performance in multipath channels remains poor
Solution Approach 1:
The patent changes the parameter of data content by replacing stuff bytes with known data sequences having specific correlation properties. This transformation enables the receiver to exploit the known structure for signal estimation and equalization, thereby improving reception performance in multipath channels while maintaining the dual stream transmission framework for reliability.
2Manufacturing precision
If stuff bytes are replaced with known data, then reception performance is enhanced, but device complexity increases
Solution Approach 1:
The patent extracts and replaces only the stuff bytes (padding data) with known data sequences, leaving the rest of the data stream structure unchanged. This selective extraction approach minimizes the increase in device complexity by affecting only the minimal necessary portions of the transmission system while still providing the benefits of known data for reception enhancement.
3Reliability
If robust data processing is applied, then transmission reliability is improved, but hardware complexity increases
Solution Approach 1:
The patent makes the robust data processing components serve multiple functions: the known data sequences generated by the robust data processor are not only used for reliability enhancement but also serve as reference signals for reception performance improvement in multipath channels. This multi-functionality reduces the need for separate dedicated hardware components.
Data Source
AI summary
Disclosed is a digital broadcasting transmission/reception system having an improved reception performance and in a signal-processing method thereof. A digital broadcasting transmitter comprises a TS stream generator for inputting robust and normal packets having stuff bytes in predetermined positions and generating dual TS stream by inserting the robust packets between the normal packets; a randomizer for randomizing the dual TS stream; a stuff byte exchanger for replacing the stuff bytes of a randomized data streams from the randomizer to a predetermined known data; and an encoder for encoding a data streams to which the known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization, so that the digital broadcasting reception performance can be improved at poor multipath channels.