Hybrid Broadcasting Signal Detection Using Reference Correlation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In hybrid broadcasting systems, existing methods for distinguishing between analog FM and DRM+ signals have low signal detection probability and high false alarm rates due to the lack of a fixed training symbol, leading to misidentification of signals.
Innovation Solution
An apparatus and method that utilize a reference signal generator to perform correlation calculations between current and previous samples of received signals, normalizing the results to distinguish between FM and DRM+ signals by judging the maximum value of the reference signal against predetermined thresholds, and using guard-interval correlation calculations to verify the presence of DRM+ signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If guard-interval correlation is used to detect DRM+ signals in hybrid broadcasting, then the system can operate without fixed training symbols, but signal detection probability decreases and false alarm rate increases
Solution Approach 1:
The patent divides the signal detection process into two independent stages: first performing guard-interval correlation to obtain a correlation signal, then performing reference signal correlation to obtain a reference signal. Each stage processes the signal independently and produces separate outputs that are combined for final detection, thereby resolving the contradiction between adaptability and reliability
Solution Approach 2:
The patent introduces an intermediary reference signal that is generated by correlating current and previous samples of the received signal. This reference signal acts as a mediator between the guard-interval correlation output and the final detection decision, enabling reliable distinction between FM and DRM+ signals without requiring fixed training symbols
2Adaptability or versatility
If the system must distinguish between FM and DRM+ signals without prior channel information, then hybrid broadcasting support is achieved, but signal misrecognition increases
Solution Approach 1:
The patent performs preliminary actions by generating a reference signal through correlation of current and previous samples before the final detection stage. This preliminary reference signal contains characteristic information that enables accurate distinction between FM and DRM+ signals, preventing misrecognition while maintaining adaptability to unknown channels
Solution Approach 2:
The patent changes the detection parameter from relying solely on guard-interval correlation to using both guard-interval correlation and reference signal correlation. By transforming the detection approach and introducing a new parameter (reference signal maximum value), the system achieves precise signal identification without requiring prior channel information
Data Source
AI summary
Disclosed are an apparatus and a method for detecting a broadcasting signal. The signal detecting apparatus according to the exemplary embodiment of the present invention includes: a reference signal generator outputting a reference signal acquired by performing a correlation calculation between a current sample and a previous sample of a received signal which is an FM signal or a digital radio mondiale plus (DRM+) signal and then normalizing a result of the correlation calculation; and a discriminator detecting a maximum value of the reference signal and judging that the received signal is the FM signal when the maximum value of the reference signal is more than a predetermined threshold.