DVB-T2 Receiving Apparatus FFT Correlation Signal Detection
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Solution Overview
Problem
Existing receiving apparatuses struggle to quickly and accurately detect the absence of DVB-T2 signals on a channel, leading to potential misidentification of interference signals as valid signals, which can result in missed channels or prolonged initial scan times.
Innovation Solution
A receiving apparatus and method that compute correlation values between signal sections and known sequences to determine the presence or absence of a DVB-T2 signal, using Fourier transform processing and correlation value thresholds to ensure accurate detection of the P1 symbol and subsequent demodulation parameters, thereby preventing erroneous decisions about signal presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correlation value computation is performed to detect P1 symbol presence, then signal detection accuracy is improved, but detection time increases due to multiple correlation computations
Solution Approach 1:
The patent performs preliminary FFT computation on the P1 symbol to convert it to frequency domain before computing correlation values. This preliminary transformation enables more accurate correlation-based detection while actually reducing total processing time by avoiding redundant time-domain computations. The frequency-domain representation allows for efficient correlation analysis that is both faster and more accurate than time-domain approaches.
2Reliability
If multiple correlation values are computed to ensure accurate signal presence detection, then detection reliability is improved, but processing complexity increases
Solution Approach 1:
The patent replaces complex time-domain correlation analysis with frequency-domain correlation computation using FFT. This substitution leverages the efficiency of frequency-domain processing to compute multiple correlation values with reduced computational complexity. The FFT-based approach maintains high detection reliability through multiple correlation checks while significantly reducing the processing burden compared to time-domain methods.
3Measurement precision
If the receiving apparatus performs thorough signal verification before channel switching, then channel detection accuracy is improved, but initial scan time increases
Solution Approach 1:
The patent performs preliminary FFT computation and correlation analysis on the P1 symbol before making channel detection decisions. This preliminary frequency-domain processing provides accurate signal presence verification that enables confident channel switching decisions. By completing thorough verification in the frequency domain first, the system achieves both high channel detection accuracy and reduced initial scan time, as subsequent channel switching can proceed confidently without repeated verification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables early and reliable detection of the absence of DVB-T2 signals, allowing for efficient channel switching and reducing initial scan time by correctly distinguishing between signal presence and absence, even in interference-prone environments.
Implementation Method 1
performing Fourier transform processing on the preamble signal including the signals of the two sections with the first correlation value equal to or higher than a threshold value obtained, thereby generating the orthogonal frequency division multiplexing signal of frequency domain
Data Source
AI summary
Disclosed herein is a receiving apparatus including a first correlation value computation section, an operation section, a second correlation value computation section, a decoding section, and a determination section.