Pilot Synchronization Symbols for Fast Digital Broadcast Service Discovery
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Solution Overview
Problem
Conventional digital broadcast networks face inefficiencies in service discovery and channel search due to insufficient Program Specific Information (PSI) or Service Information (SI) signaling, leading to sub-optimal user experience and high bandwidth costs, particularly in systems like DVB-H, where blind service discovery is slow and requires trial-and-error methods to detect non-DVB-H channels.
Innovation Solution
Incorporating a pilot synchronization symbol with known characteristics at the beginning of digital broadcast frames, which can be correlated in the frequency domain to determine a coarse frequency offset, allowing for efficient detection of digital video broadcast channels without trial-and-error methods, and using multiple pilot symbols for fast channel search and service discovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If blind service discovery is performed using conventional PSI or SI signaling, then service information can be obtained, but the channel search time is long and system efficiency decreases
Solution Approach 1:
The patent applies preliminary action by embedding known pilot symbols at predetermined positions in the broadcast frame before transmission. These pilot symbols serve as pre-prepared reference signals that enable the receiver to perform correlation-based detection, eliminating the need for blind trial-and-error searching and significantly reducing channel acquisition time.
Solution Approach 2:
The patent introduces pilot symbols as an intermediary element between the transmitter and receiver. These known reference signals act as a mediator that facilitates efficient channel detection and synchronization, allowing the receiver to quickly identify valid broadcast channels without exhaustive searching.
2Loss of information
If PSI or SI signaling is used to carry service information, then complete service data can be transmitted, but bandwidth consumption increases and system efficiency decreases
Solution Approach 1:
The patent extracts the critical synchronization and detection function from the PSI/SI signaling burden by using dedicated pilot symbols. This separation allows minimal overhead signaling for channel detection while main service information is transmitted efficiently through normal data streams, reducing overall bandwidth consumption for control purposes.
Solution Approach 2:
The patent makes the pilot symbols multi-functional by using them for both synchronization and service information indication. These known reference signals serve multiple purposes: frequency offset estimation, timing synchronization, and channel detection, eliminating the need for separate dedicated signaling resources.
3Reliability
If trial and error methods are used to detect non-DVB-H channels, then channel detection can be performed, but the detection process becomes slow and inefficient
Solution Approach 1:
The patent replaces the mechanical trial-and-error detection method with a correlation-based signal processing approach. By using known pilot symbols and computing correlation metrics, the system transitions from iterative guessing to direct mathematical detection, dramatically improving channel search speed while maintaining reliability.
Data Source
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AI summary
Aspects of the invention are directed to service and channel discovery in a digital broadcast network. A pilot synchronization symbol, which has known characteristics, is included as a first symbol of digital broadcast frames. The pilot symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. In another aspect of the invention, at least two pilot symbols may be defined and used at the beginning of each frame. The at least two pilot symbols P1 and P2 may enable fast channel search and service discovery within the frame. Signaling may be realized as a combination of L1 and L2 signaling.