Dual Transport Stream Encoding for Multipath-Resistant ATSC Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ATSC VSB digital broadcasting systems experience performance degradation in weak signal strength and dynamic multi-path interference, particularly in Doppler fading channels, and fail to improve reception performance when transmitting normal data streams in multi-path environments.
Innovation Solution
A digital broadcasting transmission and reception system that includes a randomizer, a supplementary reference signal inserter, a Reed-Solomon encoder, a robust processor for convolution-encoding, and a trellis encoder to create a dual transport stream with a robust sub-channel and supplementary reference signal, enhancing reception performance in dynamic multi-path environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ATSC VSB system transmits dual transport stream including robust data, then data transmission capability is improved, but reception performance in multi-path channel is not significantly improved
Solution Approach 1:
The transport stream is segmented into normal data and robust stream, with the robust stream further divided into robust data and supplementary reference signals. This segmentation allows different parts of the data to be treated differently, with robust data receiving enhanced protection through convolutional encoding and interleaving, while supplementary reference signals provide additional synchronization and equalization capabilities specifically tailored for multi-path environments.
Solution Approach 2:
Different encoding schemes are applied to different parts of the data stream. Normal data uses standard Reed-Solomon and trellis encoding, while robust data receives additional convolutional encoding and extensive interleaving. Supplementary reference signals are inserted at specific locations to provide localized assistance for equalization and synchronization in multi-path conditions, creating locally optimized protection where needed most.
2Adaptability or versatility
If conventional VSB system uses field sync with 312 segment units, then system compatibility is maintained, but reception performance in deteriorated channel is inferior
Solution Approach 1:
The invention merges the conventional ATSC VSB framework with enhanced robust stream processing. The supplementary reference signals are integrated into the existing segment structure, and the robust stream is multiplexed with normal data in the dual transport stream. This merging allows the system to maintain compatibility with existing ATSC receivers while providing enhanced performance for robust data in multi-path environments.
3Reliability
If robust stream is transmitted without convolutional encoding and supplementary reference signals, then transmission complexity is reduced, but reception performance in dynamic multi environment is degraded
Solution Approach 1:
Convolutional encoding and extensive interleaving are applied in advance to the robust stream before transmission. Supplementary reference signals are pre-calculated and inserted at predetermined locations in the transport stream. These preliminary actions prepare the robust data to withstand the harsh effects of multi-path propagation, reducing the need for complex equalization and correction at the receiver end.
Data Source
AI summary
Digital broadcasting transmission and reception devices and methods thereof are provided. The digital broadcasting transmission device includes a randomizer which randomizes a dual transport stream including a normal stream and a robust stream, a supplementary reference signal inserter which inserts a certain supplementary reference signal into a stuffing region included in the randomized dual transport stream, a Reed-Solomon (RS) encoder which adds a parity into a parity region included in the dual transport stream, a robust processor which configures a new dual transport stream by convolution-encoding the robust stream among the dual transport stream, an interleaver which interleaves the configured dual transport stream, a trellis encoder which trellis-encode the interleaved dual transport stream, and a modulator which transmits the trellis-encoded dual transport stream. Accordingly, a sub-channel can be provided in which the robust data and the supplementary reference signal will be transmitted.