DVB-T2 P1 Signal Detection via Correlation Reset
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Solution Overview
Problem
Existing methods struggle to detect P1 signals in DVB-T2 digital broadcasting due to unknown frame sizes, making it difficult to set a detection range and accurately decode the signals.
Innovation Solution
A receiving apparatus and method that computes correlation values between predetermined intervals within a frame, detects maximum values, and resets processing to effectively detect and decode P1 signals in DVB-T2 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If correlation-based detection is used to find P1 signals, then detection capability is improved, but detection accuracy deteriorates due to unknown frame size and detection range
Solution Approach 1:
The patent applies preliminary action by performing correlation computation between the current frame's P1 signal and previous frame's P1 signal before actual detection. This pre-computation establishes a reference correlation pattern that enables accurate detection even when frame size is unknown, as the correlation values are calculated in advance based on expected signal characteristics.
Solution Approach 2:
The patent implements feedback by continuously monitoring correlation values and using them to adjust detection parameters. The maximum correlation value detected is fed back to determine the P1 signal position and timing, allowing the system to adapt to varying frame structures and maintain detection accuracy despite unknown frame sizes.
2Adaptability or versatility
If detection range is extended to cover unknown frame sizes, then detection coverage is improved, but processing complexity increases
Solution Approach 1:
The patent applies dynamics by making the detection range adjustable rather than fixed. The system dynamically determines the appropriate detection range based on the actual frame structure and correlation patterns observed, allowing it to adapt to different frame sizes without requiring complex predefined configurations for each possible frame type.
Solution Approach 2:
The patent utilizes parameter changes by modifying detection parameters such as correlation threshold and search range based on the maximum correlation value detected. This allows the system to handle varying frame structures by adjusting parameters in response to observed signal characteristics, achieving adaptability without proportionally increasing complexity.
3Speed
If P1 signal detection is performed immediately after frame start, then response time is improved, but detection reliability deteriorates due to unknown frame size
Solution Approach 1:
The patent applies preliminary action by pre-computing correlation values between current and previous frame P1 signals before final detection. This allows the system to immediately respond to frame starts while maintaining reliability, as the correlation computation is performed in advance based on expected signal patterns, enabling both fast response and accurate detection.
Data Source
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AI summary
Disclosed herein is a receiving apparatus including a correlation value computer configured, for a digital signal, transmitted on a frame basis, having a correlation between a first section and a second section occupying predetermined intervals at a start part of each frame, to extract signals in two sections separated by time intervals of the first section and the second section and compute correlation values; a maximum value detector configured to detect a maximum value of the correlation values; a digital signal processor configured to execute processing on the digital signal on the basis of a timing with which a maximum value has been detected by the maximum value detector; and a reset processor configured to reset the processing executed in the digital signal processor every time the maximum value is detected.