Memory-Aided Synchronization for DVB-T2 Receiver Latency
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Solution Overview
Problem
The synchronization process in digital video broadcasting (DVB) systems, particularly in DVB-T2, is complex and time-consuming due to the need to decode preamble information and determine the guard interval, which delays the synchronization of demodulators and hinders the decoding of subsequent symbols.
Innovation Solution
A method and apparatus that store and replay preamble and data symbols from an initial frame to rapidly determine pilot pattern information and synchronize the demodulator, using a memory coupled with a demodulator and an analog-to-digital converter, enabling efficient synchronization by iteratively decoding second preamble symbols with different guard intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the synchronization process decodes preamble symbols to determine guard interval and pilot pattern information, then the demodulator can be synchronized to the data stream, but the process becomes time-consuming and delays synchronization completion
Solution Approach 1:
The patent stores preamble symbols and data symbols from the first frame in a memory buffer before full decoding is complete. This preliminary storage action allows the system to retrieve and reuse these symbols later for determining guard interval and pilot pattern information, eliminating the need to wait for sequential decoding to complete and thereby reducing synchronization latency while maintaining accuracy.
Solution Approach 2:
The patent creates a copy of the preamble and data symbols from the first frame and stores them in a memory buffer. This copied data can then be accessed and decoded multiple times without waiting for the original stream to progress, enabling parallel processing and significantly reducing the time required to complete synchronization while ensuring accurate determination of transmission parameters.
2Productivity
If the system decodes the first preamble symbol to determine FFT mode, then subsequent decoding can proceed, but additional frames are required to determine pilot pattern information, extending the synchronization duration
Solution Approach 1:
The patent maintains continuous useful action by buffering incoming symbols during the first frame and immediately utilizing these buffered symbols for subsequent decoding operations. Instead of pausing to wait for complete frame decoding, the system continuously processes available data, determining guard interval and pilot pattern information from the buffered first frame data, thereby eliminating idle time and reducing overall synchronization duration while maintaining decoding accuracy.
Data Source
AI summary
In one embodiment, a method may include storing information from a first frame of an incoming broadcast signal in a memory coupled to a demodulator, decoding a first preamble symbol of the first frame to determine a transmission mode, accessing at least some of the stored information from the memory and decoding at least one second preamble symbol of the first frame from the accessed information to determine pilot pattern information, and receiving data symbols of the first frame and synchronizing the demodulator based on the received data samples and the pilot pattern information.