ATSC VSB Robust Stream Coding for Poor Multipath Reception
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Solution Overview
Problem
The ATSC VSB digital broadcasting system experiences poor reception performance in poor channel environments, particularly due to the limited error-correcting capacity of the trellis encoder, requiring increased energy for improved reception.
Innovation Solution
A digital broadcasting system that combines a normal stream with a robust stream, utilizing a robust data pre-processor, convolutional encoder, RS encoder, and trellis encoder to enhance coding gain, and a receiver with a turbo decoder to detect and decode the robust stream, maintaining compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trellis encoder is used in the ATSC VSB system, then the system maintains compatibility with existing digital broadcasting standards, but the error-correcting capacity is insufficient in poor channel environments
Solution Approach 1:
The patent combines a trellis encoder with a convolutional encoder to create a hybrid coding structure. The convolutional encoder processes the input data first, and then the trellis encoder further encodes the output. This merging of two encoding methods enhances the overall error-correcting capacity while maintaining compatibility with existing ATSC VSB systems that use trellis encoding.
2Reliability
If the trellis encoder's error-correcting capacity is increased, then reception performance in poor channels improves, but the system requires increased energy output
Solution Approach 1:
The patent changes the coding parameters by introducing convolutional encoding with specific rates (1/2, 2/3, 3/4) before the trellis encoding stage. This parameter change allows the system to achieve better error correction with optimized energy consumption by distributing the encoding burden across two stages rather than increasing the complexity of a single trellis encoder.
3Reliability
If a hybrid coding structure with convolutional and trellis encoders is implemented, then coding gain is enhanced, but the device complexity increases
Solution Approach 1:
The patent segments the encoding process into two distinct stages: a first encoding stage using convolutional encoding and a second encoding stage using trellis encoding. This segmentation allows each encoder to perform its specific function optimally, achieving enhanced coding gain while managing complexity through modular design where each stage can be independently implemented and optimized.
Data Source
AI summary
A digital broadcasting transmission/reception system having improved receiving performance and signal processing method thereof. A digital broadcasting transmitter according to the present invention includes a data pre-processor which processed robust data and generates robust data packet of predetermined format, a TS stream generator which combines robust data packet with a normal data packet to generate a TS stream of a predetermined format, a randomizer which randomizes the TS stream output from the TS stream generator, a convolution encoder which performs convolution encoding with respect to the robust data of the data output from the randomizer, and a RS encoder which performs RS encoding with respect to the data output from the convolution encoder. Accordingly, digital broadcasting receiving performance can be improved in a poor multipath channel, while maintaining compatibility with existing transmission/reception system.