DVB-H Service Discovery via Initialization Symbols
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Solution Overview
Problem
Conventional digital video broadcast service discovery in DVB-H systems is inefficient due to reliance on trial-and-error methods for channel synchronization, requiring extensive time to detect non-DVB-H services, which affects the speed of channel search and user experience.
Innovation Solution
Introduction of a known initialization/synchronization symbol with unique subcarrier combinations and modulation for each FFT-size and frequency offset pair, allowing for rapid identification of digital video broadcast signals and efficient detection of empty or non-DVB-H channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trial-and-error methods are used for channel synchronization in DVB-H systems, then service discovery can be performed, but channel search time is excessively long
Solution Approach 1:
The patent applies preliminary action by inserting known initialization/synchronization symbols at predetermined positions in the data stream before transmission. These symbols contain predefined patterns that enable the receiver to quickly identify and synchronize with the signal without requiring trial-and-error methods. The receiver correlates the received signal with stored reference patterns from these preliminary symbols, achieving fast channel search and service discovery.
2Loss of information
If PSI or SI signaling is used to locate program components, then service information can be obtained, but bandwidth consumption is large and system efficiency decreases
Solution Approach 1:
The patent extracts essential service discovery information from the traditional PSI/SI signaling structure and places it into compact initialization/synchronization symbols. By taking out only the critical synchronization and identification data needed for service discovery and embedding it in these dedicated symbols, the system reduces the bandwidth overhead associated with complete PSI/SI tables while maintaining sufficient information for efficient service location.
3Loss of energy
If PSI and SI tables with long repetition periods are used, then bandwidth is saved, but end user experience becomes sub-optimal due to delayed service information updates
Solution Approach 1:
The patent implements periodic action through the regular insertion of initialization/synchronization symbols at fixed intervals in the transmitted data stream. These symbols appear periodically at predetermined positions, providing continuous service discovery opportunities without requiring long repetition periods of full PSI/SI tables. This periodic structure enables frequent service information updates while maintaining efficient bandwidth utilization.
Data Source
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AI summary
Embodiments are directed to binary phase shift key modulating a first pilot symbol according to a reference sequence, and differentially binary phase shift key modulating a second pilot symbol. The original reference sequence and the delayed differentially modulated sequence are then combined before performing an Inverse Fast Fourier Transform and inserting a guard interval. Receiver operations are an inverse of the transmitter operations, which were just discussed. The receiver does not have to know the reference sequence. Embodiments are directed to specifying a plurality of seeds that are bit patterns each having r bits not all of which have a value of zero, extending the seeds into respective sequences by applying to each seed a recurrence formula; and using one of the sequences as a comb sequence and using the sequences other than the comb sequence as binary phase shift keying patterns.