Dual Transport Stream P2-VSB Coding for Multipath Receptivity
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Solution Overview
Problem
Conventional digital broadcasting transmission systems, such as ATSC VSB, experience performance degradation due to dynamic multipath interference and weak signals, particularly in bad channels like Doppler fading channels, and are limited in improving receptivity by the addition of turbo streams, which also increases average power consumption.
Innovation Solution
The system employs P2-VSB coding for turbo streams, using an RS encoder, interleaver, turbo processor, and trellis encoder to encode and multiplex dual transport streams, allowing for the addition of multiple turbo streams without rate limitations, enhancing receptivity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple turbo streams are added to improve receptivity in bad channels, then reliability is improved, but average power consumption increases
Solution Approach 1:
The patent applies P2-VSB coding which changes the coding parameters and structure to achieve more efficient error correction. This allows the system to maintain improved receptivity with fewer turbo streams, thereby reducing the power consumption associated with transmitting multiple turbo streams while still achieving reliable reception in bad channel conditions
Solution Approach 2:
The patent applies different coding schemes to different parts of the transport stream - P2-VSB coding is specifically applied to turbo streams while normal streams use conventional coding. This localized application of enhanced coding to only the necessary portions (turbo streams for error resilience) improves receptivity without requiring all streams to consume additional power
2Reliability
If turbo streams are added to improve receptivity, then reliability is improved, but the number of turbo streams is limited by rate constraints
Solution Approach 1:
P2-VSB coding changes the coding rate and structure parameters, allowing for more flexible integration of turbo streams. The patent demonstrates that this coding scheme enables the system to add multiple turbo streams without being constrained by traditional rate limitations, as the P2-VSB structure efficiently packs and transmits the coded data
Solution Approach 2:
The patent segments the transport stream into normal streams and turbo streams, applying P2-VSB coding specifically to the turbo stream portions. This segmentation allows independent optimization of each stream type and enables flexible addition of multiple turbo streams with varying rates without affecting the overall system structure
3Reliability
If conventional VSB coding is used, then device complexity is low, but receptivity degrades in multipath channels
Solution Approach 1:
The patent creates a composite coding structure by combining P2-VSB coding with conventional VSB modulation and trellis encoding. This composite approach integrates multiple coding techniques where P2-VSB provides the core error correction capability for turbo streams, while maintaining compatibility with existing VSB infrastructure, thus improving receptivity without proportionally increasing overall system complexity
Data Source
AI summary
A digital broadcasting transmission system and method thereof. The digital broadcasting transmission system, comprises an RS encoder to encode a dual transport stream (TS) which includes a normal stream and a plurality of turbo streams multiplexed together, an interleaver to interleave the encoded dual TS, a turbo processor to detect the turbo streams from the interleaved dual TS and to encode the detected turbo stream, and a trellis encoder to pseudo2 (P-2) vestigial sideband (VSB) code the turbo-processed dual TS, and, then, to perform trellis encoding, and a main multiplexer (MUX) to multiplex the trellis-encoded dual TS by adding a field synchronous signal and a segment synchronous signal thereto.