Multi-Carrier Blind Scan for Seamless Cellular Signal Analysis
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Solution Overview
Problem
Conventional blind scan functionality in receivers is inefficient and time-consuming, requiring manual selection of carrier frequencies, which can lead to errors and difficulties in detecting and correcting interference in RF channels, especially in dynamically changing environments like the CBRS band.
Innovation Solution
A test device performs a blind scan that automatically detects multiple carriers for various technologies, seamlessly integrates signal analysis, and triggers interference hunting and EMF testing, reducing scan time by demodulating only specific portions of channels using parallel detection and correlation with 3GPP standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional blind scan functionality is used to search for carrier frequencies, then the receiver can locate available channels, but the analysis process requires significant time and is inefficient
Solution Approach 1:
The patent divides the RF spectrum into multiple frequency bands and segments the blind scan process into parallel detection tasks for different technologies (LTE, NR, DSS). Each segment can be processed simultaneously, reducing total scan time while maintaining comprehensive coverage of all possible carrier frequencies.
Solution Approach 2:
The system performs preliminary correlation with 3GPP standards during the blind scan to pre-identify valid carrier frequencies and channel configurations before full signal analysis is required. This preliminary action filters out invalid frequencies early, reducing the time needed for subsequent detailed analysis.
2Measurement precision
If manual selection of carrier frequencies is required, then the user can specify exact frequencies, but the process becomes tedious and error-prone
Solution Approach 1:
The blind scan functionality automatically detects and identifies valid carrier frequencies by correlating received signals with 3GPP standard patterns. The system self-determines the correct frequencies without requiring manual user input, eliminating errors while maintaining precision through standardized correlation algorithms.
Solution Approach 2:
The system continuously monitors the RF spectrum and provides feedback about detected carrier frequencies and their validity. This feedback mechanism allows the receiver to automatically adjust and refine frequency selections based on actual signal characteristics, ensuring accuracy without manual intervention.
3Reliability
If valid carrier frequencies are not known or manually entered correctly, then interference and RF channel issues can be detected, but the detection process becomes difficult and time-consuming
Solution Approach 1:
The blind scan performs preliminary detection of carrier frequencies and their validity before interference analysis begins. By pre-establishing the correct frequency list through correlation with 3GPP standards, the system eliminates the need for manual frequency entry during interference detection, reducing time while maintaining reliability.
Solution Approach 2:
The patent merges the blind scan functionality with interference detection and signal analysis into a unified automated process. The same receiver hardware and processing units perform all functions sequentially without manual reconfiguration, combining multiple detection tasks into a single streamlined workflow that reduces overall time while maintaining comprehensive reliability.
4Measurement precision
If the receiver processes the entire RF spectrum, then all channels can be analyzed, but the processing time increases significantly
Solution Approach 1:
The RF spectrum is segmented into multiple frequency bands and technology-specific channels, allowing parallel processing of different segments simultaneously. This segmentation enables comprehensive spectrum analysis while reducing total processing time through concurrent operations on multiple frequency ranges.
Solution Approach 2:
The system performs partial correlation with 3GPP standards during blind scan to quickly identify valid carrier frequencies without processing every possible frequency point exhaustively. This partial action approach maintains sufficient measurement precision for reliable detection while significantly improving processing speed by avoiding unnecessary computations on invalid frequencies.
Data Source
AI summary
A test device for performing a bling scan on received RF signals to determine whether the received RF signals include channels of specific cellular technologies, including demodulating a portion of a bandwidth of channels of the received RF signals that carries a primary synchronization signal, converting the demodulated portion of the bandwidth of the channels of the received RF signals to a baseband frequency range for each of the specific cellular technologies, and using detectors to perform primary synchronization signal correlation in the baseband frequency range for each of the specific cellular technologies to detect that the received RF signals includes at least one channel of a particular technology. Upon detecting the at least one channel of the particular technology, the test device launches a signal analysis application or a spectrum analysis application for the at least one channel according to a carrier frequency of the particular technology.