Digital Video Broadcast Preamble Signaling Distribution
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Solution Overview
Problem
Existing digital video broadcast systems face inefficiencies in physical layer and data link layer signaling due to insufficient PSI/SI signaling, leading to sub-optimal user experience, high bandwidth requirements, and vulnerability to interference in wireless communications systems like DVB-H.
Innovation Solution
The proposed solution involves distributing physical layer pre-signaling data among preamble symbols, with excess data written to subsequent data symbols or carried in additional preamble symbols, and using different permutation rules for frequency interleaving odd and even OFDM symbols to enhance robustness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSI or SI signalling is used in wireless communications systems, then service information can be transmitted, but bandwidth consumption increases and system efficiency decreases
Solution Approach 1:
The patent extracts service information from traditional PSI/SI tables and relocates it to L1 and L2 signaling fields in preamble symbols. This extraction removes the burden of large PSI/SI tables from the data stream, reducing bandwidth consumption while maintaining service information transmission capability.
Solution Approach 2:
The patent moves service information transmission from the data stream dimension to the physical layer signaling dimension (preamble symbols). This dimensional change allows service information to be carried in dedicated signaling fields rather than consuming data stream bandwidth, improving system efficiency.
2Reliability
If physical layer pre-signalling data is distributed among multiple preamble symbols, then robustness against interference improves, but system complexity increases
Solution Approach 1:
The patent segments physical layer pre-signalling data across multiple P2 preamble symbols (typically 2-8 symbols). This segmentation distributes the signaling load and provides time diversity, making the system more robust against impulse interference while managing complexity through systematic distribution rules.
Solution Approach 2:
The patent performs preliminary distribution of L1 pre-signaling data across multiple preamble symbols before actual data transmission begins. This preliminary arrangement ensures that signaling information is already dispersed and protected against interference before the data stream starts, simplifying subsequent processing.
3Loss of information
If excess physical layer data exceeds the capacity of predetermined preamble symbols, then all signalling data can be transmitted, but transmission time increases
Solution Approach 1:
The patent merges excess physical layer signalling data with data symbols that immediately follow the preamble symbols. This combination allows continuous transmission without idle time, ensuring complete signalling data transmission while minimizing transmission time by utilizing otherwise idle data symbol resources.
Data Source
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AI summary
Aspects of the invention are directed to physical layer and data link layer signaling in digital video broadcast preamble symbols. Embodiments are directed to distributing physical layer pre-signalling data among preamble symbols. If physical layer data is larger than a predetermined number of preamble symbols, then excess physical layer data is written to data symbols immediately following the preamble symbols in top-down order symbol by symbol or the predetermined number of preamble symbols is increased. If physical layer data is not larger than the predetermined number of preamble symbols such that there is excess preamble symbol space, physical layer pipe 0 data comprising link layer signaling and notification data is carried in the excess preamble symbols or the excess preamble symbols are left empty. Different permutation rules may be used to frequency interleave odd-numbered versus even-numbered orthogonal frequency division multiplexing symbols.