Multi-Transport Stream Multiplexing for Robust ATSC VSB Reception
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Solution Overview
Problem
Conventional ATSC VSB digital broadcast systems face challenges in transmitting and receiving dual transport streams with normal and turbo data of various coding rates, leading to degraded reception in poor channel conditions and increased power consumption.
Innovation Solution
A digital broadcast system that generates and transmits multi-transport streams by multiplexing normal and turbo streams with variable coding rates, using Reed-Solomon encoding, duplicators, and processors to reconstruct and decode the streams, reducing power consumption and improving reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual transport stream (TS) including normal data and turbo data is transmitted in conventional ATSC VSB system, then data transmission capability is improved, but reception quality degrades in poor channel conditions
Solution Approach 1:
The patent segments the transport stream into normal TS and turbo TS components, allowing selective processing and transmission. The turbo TS is specifically designed to handle poor channel conditions by using turbo coding, while normal TS carries standard data, enabling differentiated protection strategies for different data types
Solution Approach 2:
The patent changes the coding parameters by introducing turbo coding with variable coding rates (1/2, 1/3, 1/4) for the turbo TS, compared to the conventional 8-VSB coding. This parameter change allows the system to adapt to different channel conditions and improve reception quality in poor environments while maintaining data transmission capability
2Productivity
If dual transport stream (TS) including normal data and turbo data is transmitted in conventional ATSC VSB system, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent introduces dynamic coding rate selection for the turbo TS, allowing the system to adjust the coding rate (1/2, 1/3, 1/4) based on channel conditions and data requirements. This dynamic adjustment optimizes the balance between transmission reliability and power consumption, as higher coding rates provide better error correction but require more processing power
Solution Approach 2:
The patent applies turbo coding selectively only to specific portions of the data stream (turbo TS) rather than the entire transport stream. This partial action approach provides enhanced error correction where needed while avoiding the excessive power consumption that would result from applying complex turbo coding to all data
3Stability of the object's composition
If field sync signal is used in unit of 312 segments in ATSC VSB system, then synchronization is maintained, but reception degrades in poor channel such as Doppler fading channel
Solution Approach 1:
The patent incorporates turbo coding with powerful error correction capabilities before transmission, providing a cushion against channel impairments. The turbo code's iterative decoding process and redundancy are designed in advance to compensate for expected Doppler fading and other poor channel conditions, maintaining reception quality despite the fixed 312-segment field sync structure
Data Source
AI summary
A transport stream (TS) generating apparatus, a transmitting apparatus, a receiving apparatus, a digital broadcast system having the above, and a method thereof are provided. The digital broadcast system includes a transport stream (TS) generating apparatus which generates a multi transport stream (TS) by multiplexing a normal stream and a turbo stream having a variable coding rate, a transmitting apparatus which re-constructs the multi TS by processing the turbo stream, and transmits the re-constructed multi TS, and a receiving apparatus which receives the re-constructed multi TS, and decodes the normal stream and the turbo stream respectively, to recover normal data and turbo data. Accordingly, a multi TS, which includes normal stream and a turbo stream of various coding rates, can be transmitted and received efficiently.