UAV Synchronization via PSS Sequence Detection
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Solution Overview
Problem
Existing UAV synchronization methods are not suitable for strong interference and long-distance scenes due to high complexity, power consumption, and unsuitability for engineering applications, particularly in environments with high interference and long-range communication requirements.
Innovation Solution
A synchronization method involving periodic transmission of Primary Synchronization Signals (PSS) and Physical Downlink Shared Channel (PDSCH) control information across multiple frequency points, allowing devices to detect and synchronize, while adapting frequency point conversion periods and CFO detection to achieve synchronization in challenging environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cached data portions are correlated and parallel FFT is performed to estimate Doppler frequency offset and signal scale variation, then synchronization accuracy is improved, but data processing complexity increases and CPU power consumption increases
Solution Approach 1:
The patent extracts only the necessary synchronization information from the received signal by directly detecting the Primary Synchronization Signal (PSS) sequence, rather than performing comprehensive signal processing including cached data correlation and parallel FFT. This extraction approach obtains sufficient synchronization data with reduced computational complexity.
Solution Approach 2:
Instead of using complex signal processing methods to achieve synchronization, the patent inverts the approach by using simple sequence detection and threshold judgment. The method reverses the traditional processing order, performing PSS detection first and then making synchronization decisions based on detection results, thereby reducing computational burden.
2Measurement precision
If cached data portions are correlated and parallel FFT is performed to estimate Doppler frequency offset and signal scale variation, then synchronization accuracy is improved, but CPU power consumption increases
Solution Approach 1:
The patent extracts only the necessary synchronization information from the received signal by directly detecting the Primary Synchronization Signal (PSS) sequence, rather than performing comprehensive signal processing including cached data correlation and parallel FFT. This extraction approach obtains sufficient synchronization data with reduced computational complexity.
Solution Approach 2:
Instead of using complex signal processing methods to achieve synchronization, the patent inverts the approach by using simple sequence detection and threshold judgment. The method reverses the traditional processing order, performing PSS detection first and then making synchronization decisions based on detection results, thereby reducing computational burden.
3Use of energy by moving object
If MCS-51 single chip microcomputer is used for self-synchronization in time division system, then power consumption of receiving and transmitting duplexer is reduced, but adaptability to strong interference scenes decreases
Solution Approach 1:
The patent changes the detection parameters and signal processing approach to enhance anti-interference capability. By using PSS sequence detection with threshold judgment and implementing frequency point scanning, the system adapts to strong interference environments while maintaining low power consumption through efficient detection algorithms.
Solution Approach 2:
The patent performs preliminary frequency point scanning and PSS sequence detection before establishing full synchronization. This preliminary action allows the system to identify suitable frequency points and detect synchronization signals in advance, improving reliability in interference-prone environments before committing to full communication mode.
4Speed
If frequency points F1 to FN are scanned sequentially to detect PSS sequence, then synchronization speed is improved, but detection complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into discrete frequency points (F1 to FN) and scans them sequentially. This segmentation allows the detector to systematically search for PSS sequences at each frequency point using correlation detection, achieving fast synchronization through structured frequency domain scanning without overwhelming computational complexity.
Solution Approach 2:
The patent performs detection at multiple frequency points (N different frequency points) to ensure reliable PSS sequence acquisition. By scanning more frequency points than strictly necessary, the system increases the probability of finding valid synchronization signals quickly, trading some detection complexity for improved synchronization speed and reliability.
Data Source
AI summary
Provided is a synchronization method, which includes: a first device periodically sends a first PSS sequence and first PDSCH control information at frequency points F1 to FN in sequence, where the first PSS sequence and the first PDSCH control information are used for a second device to detect the first PSS sequence and detect the first PDSCH control information; the first device receives signals at frequency points f1 to fM in sequence and detects a second PSS sequence; when the second PSS sequence is detected, the first device obtains second half-frame synchronization information and detects second PDSCH control information according to the second half-frame synchronization information; and when the second PDSCH control information is detected, the first device obtains second frame synchronization information and enters a synchronization state. Also provided are a synchronization device, a synchronization system, and a computer-readable storage medium.