Cross-Stream Error Correction for Reliable Mobile TV Reception
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Solution Overview
Problem
The existing ATSC digital TV broadcast system faces challenges in providing reliable mobile reception of digital television signals, particularly due to issues like burst noise and deep channel fading, which hinder clear reception on mobile and handheld devices.
Innovation Solution
The proposed solution involves a broadcasting method that combines error correction coding techniques, such as systematic and non-systematic convolutional coding, along with transmission diversity methods, to enhance the robustness of digital television signals. This includes generating packets with audiovisual information and separate error correction coding information, which can be associated using control data, allowing mobile devices to utilize additional error correction necessary for reliable reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ATSC digital TV broadcast is used for mobile reception, then standard definition video can be transmitted, but reception reliability deteriorates due to burst noise and deep channel fading
Solution Approach 1:
The patent segments the error correction coding into two separate streams: a first stream containing first error correction coding information and a second stream containing second error correction coding information. This segmentation allows mobile devices to selectively combine error correction codes from both streams to combat burst noise and deep channel fading, thereby improving reception reliability without requiring the entire encoded stream to be received intact.
Solution Approach 2:
The patent changes the parameter of error correction coding by transmitting different types of error correction coding information in separate streams (systematic coding in one stream, non-systematic coding in another). This parameter change enables receivers to adaptively select and combine the most appropriate error correction codes based on channel conditions, improving reliability against specific impairments like burst noise and fading.
2Reliability
If separate streams with different error correction coding are transmitted, then reception robustness improves, but transmission complexity increases
Solution Approach 1:
The patent makes the transmission system universal by designing it to support both mobile and stationary receivers. The first stream is configured to be usable by both mobile and stationary receivers, while the second stream provides additional error correction specifically for mobile devices. This multi-functionality allows a single transmission infrastructure to serve multiple receiver types without requiring separate transmission systems, thereby managing complexity while improving robustness.
Solution Approach 2:
The patent performs preliminary action by pre-configuring the error correction coding structure before transmission. The systematic and non-systematic error correction codes are prepared and organized into separate streams in advance, with metadata indicating how they should be combined. This preliminary organization simplifies the transmission process and enables receivers to efficiently combine the codes without complex real-time processing, reducing transmission complexity while maintaining robustness.
3Reliability
If additional error correction coding information is transmitted in separate streams, then mobile reception reliability improves, but bandwidth efficiency decreases
Solution Approach 1:
The patent applies partial action by transmitting only the necessary portions of error correction coding information in separate streams. The first stream contains error correction codes sufficient for basic reception by all devices, while the second stream contains additional error correction codes specifically for mobile devices experiencing harsher channel conditions. This partial duplication of error correction functionality provides enhanced reliability for mobile reception without completely duplicating the entire error correction scheme, thereby managing bandwidth efficiency.
Data Source
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AI summary
A system and method for wirelessly transmitting audiovisual information. A first plurality of packets including audiovisual information may be generated. A second plurality of packets including error correction coding information for the audiovisual information may be generated. Control information for associating the error correction coding information with the audiovisual information may be generated, and a third plurality of packets including the control information may also be generated. The plurality of packets, including the first, second, and third pluralities of packets, may be transmitted to a mobile device in a wireless manner. The control information may inform the mobile device of the association of the first error correction coding information with the audiovisual information.