DVB-H Receiver Fast Re-synchronization via Preliminary Action
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Solution Overview
Problem
Conventional DVB-H receivers experience high power consumption due to lengthy re-synchronization times between data bursts, with OFDM symbol number detection contributing approximately 49% to the total re-synchronization time, necessitating a fast re-synchronization technique to reduce average power consumption.
Innovation Solution
A method and system for DVB-H receivers that perform a data bit re-synchronization sequence, reducing re-acquisition time at various stages by initializing AGC control words, utilizing previous burst data for mode and guard detection, bypassing continuous pilot correlation, and using an on-chip timer to count OFDM symbols, thereby shortening synchronization time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional re-synchronization procedures are used, then complete TPS information acquisition and OFDM symbol number detection are performed, but the re-synchronization time becomes excessively long, increasing power consumption
Solution Approach 1:
The patent applies preliminary action by storing synchronization information (TPS data, OFDM symbol numbers, frequency offsets) from previously received bursts in memory. When a new burst arrives, the receiver retrieves this pre-stored information instead of performing complete re-detection, significantly reducing re-synchronization time while maintaining accuracy through selective verification of the stored data.
Solution Approach 2:
The patent extracts only the critical synchronization parameters (TPS information, OFDM symbol number, frequency offset) from the complete burst data and stores them for reuse. This extraction approach allows the system to discard the bulk data while retaining only the essential synchronization elements needed for rapid re-synchronization without performing full TPS detection again.
2Reliability
If the receiver stays active for complete re-synchronization procedures, then all PHY parameters are accurately synchronized, but the receiver active time increases, leading to higher average power consumption
Solution Approach 1:
The patent applies partial action by performing only the necessary portion of re-synchronization procedures. Instead of executing complete TPS detection and OFDM symbol number detection for every burst, the system performs partial verification of stored synchronization data and only executes full procedures when necessary, reducing active time and power consumption while maintaining sufficient synchronization reliability.
Solution Approach 2:
By pre-storing synchronization parameters from previous bursts, the system prepares synchronization data in advance, allowing rapid retrieval and verification rather than complete re-detection. This preliminary action enables the receiver to maintain reliable synchronization with minimal active time, directly reducing average power consumption.
3Measurement precision
If OFDM symbol number detection is performed completely, then accurate frame synchronization is achieved, but this process contributes approximately 49% of total re-synchronization time
Solution Approach 1:
The patent applies preliminary action by capturing and storing the OFDM symbol number information from previously detected bursts. When a new burst arrives, the system retrieves the stored symbol number and performs only minimal verification rather than complete detection, reducing the 49% time contribution to a fraction of the original duration while maintaining synchronization accuracy.
Solution Approach 2:
The patent extracts the critical OFDM symbol number parameter from the complete burst structure and stores it separately for reuse. This extraction allows the system to bypass the time-consuming complete detection process and directly utilize the extracted symbol number information, dramatically reducing detection time while preserving accuracy.
Data Source
AI summary
A system and method of performing re-synchronization for a Digital Video Broadcasting over Handheld (DVB-H) receiver comprises performing a time division multiplexing (TDM) data burst transmission sequence on bits of data received by the DVB-H receiver; performing a data bit re-synchronization sequence on the DVB-H receiver; and reducing a re-acquisition time at every stage of the data bit re-synchronization sequence, wherein the reducing process results in a reduction in the time to perform the re-synchronization for the DVB-H receiver, wherein the reduction in the time to perform the re-synchronization for the DVB-H receiver is greater than one-half of the time required to perform the re-synchronization for the DVB-H receiver absent the reducing of the re-acquisition time at every stage of the data bit re-synchronization sequence.