DVB-S2 Spectrum Inversion Detection via Differential Correlation
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Solution Overview
Problem
In digital television broadcasting, especially in DVB-S2 systems, spectrum inversion can cause activation failures due to misinterpretation of in-phase and quadrature components by tuners and mixers, leading to delayed power-on times if not timely detected.
Innovation Solution
An apparatus and method that perform odd-order differential correlation on input signals to detect spectrum inversion by analyzing the phase of the correlation result, using a differential correlator and determining module, applicable to DVB-S2 compliant systems and others with similar signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spectrum inversion is not timely detected, then signal processing procedures can be completed, but activation failure occurs and power-on time is delayed
Solution Approach 1:
The patent applies preliminary action by performing spectrum inversion detection before completing full signal processing procedures. The determining module detects spectrum inversion in the received signal using correlation operations on pilot symbols, enabling early identification of the issue before it causes activation failure. This allows the system to correct the inversion by exchanging in-phase and quadrature components promptly, thereby preventing activation failure and reducing power-on time delays.
2Reliability
If spectrum inversion detection is added, then activation failure can be prevented, but device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a determining module that performs correlation operations on pilot symbols to detect spectrum inversion. This module acts as an intermediary between the receiver and the signal processing pipeline, providing a simple yet effective detection mechanism. The determining module calculates correlation values between received pilot symbols and expected pilot symbols, then determines whether spectrum inversion occurred based on the correlation results, enabling reliable detection without significantly increasing overall system complexity.
Data Source
AI summary
An apparatus for detecting spectrum inversion includes a different correlator and a determining module. The differential correlator performs an odd-order differential correlation on an input signal and a known signal to generate a differential correlation result. When the input signal is determined as corresponding to a target signal of the known signal, the determining module detects spectrum inversion in the input signal according to the phase of the differential correlation result.