DVB-T2 Receiver Spectrum Inversion Detection and Correction
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Solution Overview
Problem
DVB-T2 signals experience spectrum inversion during reception, leading to incorrect demodulation and failure in acquiring necessary information for frame demodulation due to the OFDM modulation method used in DVB-T2 standard.
Innovation Solution
A reception apparatus and method that includes spectrum inversion detection and correction processes, utilizing a P1 signal to detect and mitigate spectrum inversion, ensuring correct demodulation of DVB-T2 signals by performing a spectrum inversion process when detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM modulation method is used for DVB-T2 signals, then signal transmission efficiency is improved, but spectrum inversion occurs during reception causing demodulation failure
Solution Approach 1:
The patent applies preliminary action by detecting spectrum inversion using the P1 signal before the main data signal is demodulated. The P1 signal is processed first to determine whether spectrum inversion has occurred, and this detection result is used to guide the subsequent demodulation process. This advance detection prevents demodulation errors in the main data signal.
Solution Approach 2:
The patent applies inversion principle by performing spectrum inversion processing on the received signal when spectrum inversion is detected. The spectrum inversion unit inverts the spectrum of the received signal to correct the inversion caused during transmission, thereby restoring the original signal structure for accurate demodulation.
2Reliability
If spectrum inversion detection is performed using P1 signal, then correct demodulation is achieved, but additional processing steps are required
Solution Approach 1:
The patent applies self-service principle by using the P1 signal itself to detect spectrum inversion. The P1 signal contains embedded information that allows the receiver to self-diagnose whether spectrum inversion has occurred without requiring external reference signals or complex external calibration processes.
Solution Approach 2:
The patent applies multi-functionality principle by making the P1 signal serve multiple purposes: it acts as both a synchronization signal for frame detection and as a reference signal for spectrum inversion detection. This eliminates the need for separate reference signals and reduces overall system complexity.
3Reliability
If spectrum inversion process is applied to received signal, then demodulation correctness is improved, but processing time increases
Solution Approach 1:
The patent performs spectrum inversion detection using the P1 signal before processing the main data signal. This preliminary detection allows the system to determine whether spectrum inversion processing is needed, avoiding unnecessary processing time when no inversion has occurred and ensuring correct processing when inversion has occurred.
Solution Approach 2:
The patent applies dynamics principle by making the spectrum inversion processing conditional rather than fixed. The system dynamically adjusts whether to apply spectrum inversion processing based on the detection result from the P1 signal, optimizing processing time by applying the correction only when necessary.
Data Source
AI summary
Disclosed herein is a reception apparatus including: a spectrum inversion detection section configured to detect the occurrence or absence of spectrum inversion in a received signal complying with the Digital Video Broadcasting-Terrestrial 2 standard known as DVB-T2, using a P1 signal constituting the received signal; a spectrum inversion section configured to perform a spectrum inversion process on the received signal if the occurrence of the spectrum inversion is detected at least by the spectrum inversion detection section; and a demodulation section configured to demodulate the received signal having undergone the spectrum inversion process if the occurrence of the spectrum inversion is detected by the spectrum inversion detection section, the demodulation section further demodulating the received signal yet to undergo the spectrum inversion process if the absence of the spectrum inversion is detected by the spectrum inversion detection section.