Phase Pattern Synchronization Signal Processing for UHF Carrier Frequency Offset
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Solution Overview
Problem
In ultrahigh frequency wireless communication systems, existing methods face challenges in efficiently receiving synchronization signals and compensating for carrier frequency offsets, leading to increased complexity and memory demands, particularly in handling synchronization signals from multiple base stations.
Innovation Solution
A method involving user equipment that receives synchronization signals with a predetermined repetition count and phase pattern vector from multiple base stations, measures correlation values to select the best base station, and adjusts the phase sequence, allowing for efficient connection establishment and reduced complexity by reusing sequences between adjacent base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional reference symbol-based CFO estimation is used in ultrahigh frequency systems, then the method is simple to implement, but the CFO compensation accuracy deteriorates due to increased Doppler effect and carrier frequency offset at high frequencies
Solution Approach 1:
The synchronization signal is segmented into multiple repetitions, and the patent processes each repetition separately to estimate CFO. By dividing the synchronization signal into multiple segments and processing them individually, the system achieves more accurate CFO estimation while managing processing complexity through structured segmentation.
Solution Approach 2:
The patent utilizes periodic repetition of synchronization signals at predetermined intervals. By transmitting synchronization signals periodically and using the phase differences between repeated signals for CFO estimation, the system improves measurement accuracy while maintaining a manageable processing complexity through the regular periodic structure.
2Reliability
If synchronization signals are transmitted from multiple base stations, then the user equipment can select the best base station for connection, but the complexity and memory demand for processing multiple synchronization signals increases
Solution Approach 1:
The patent performs preliminary processing of synchronization signals by measuring correlation values between received signals and expected signal patterns before final base station selection. This preliminary correlation measurement simplifies the subsequent base station selection process by pre-computing key metrics, thereby reducing overall processing complexity while maintaining reliable connection establishment.
Solution Approach 2:
The patent changes the representation parameters of synchronization signals by using correlation values as key metrics for base station selection. Instead of processing raw synchronization signals directly for comparison, the system transforms them into correlation value parameters, which simplifies the selection process and reduces memory requirements while improving reliability.
3Object-generated harmful factors
If sequences are uniquely assigned to each base station to avoid interference, then interference between base stations is minimized, but the complexity of sequence assignment and management increases
Solution Approach 1:
The patent uses identical or similar sequences across multiple base stations instead of unique sequences for each base station. By copying the same sequence pattern and using correlation-based processing to distinguish between base stations, the system reduces sequence assignment complexity while managing interference through signal processing rather than sequence differentiation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the efficiency of receiving synchronization signals, reduces implementation complexity and memory demands, and enhances network performance by optimizing the processing of synchronization signals in ultrahigh frequency band communication systems.
Implementation Method 1
measuring a start timing of a frame, a sequence index and an index of a phase pattern vector using the plurality of synchronization signals
Implementation Method 2
the phase pattern vector is used for the base station to change a phase of the sequence by the repetition count
Implementation Method 3
Doppler effect generated by movement of a UE or carrier frequency offset (CFO) generated by a difference in oscillators between a UE and a BS occurs more seriously
Implementation Method 4
carrier frequency offset (CFO) generated by a difference in oscillators between a UE and a BS
Data Source
AI summary
Disclosed is a synchronization signal receiving method comprising a step of respectively receiving, from a plurality of base stations, a plurality of synchronization signals generated by using a predetermined repetition frequency, sequence, and phase pattern vector, measuring a start timing of a frame, a sequence index, and an index of the phase pattern vector by using the plurality of synchronization signals with respect to each of the plurality of base stations, selecting the base station having the highest correlation value calculated as a result of the measurement among the plurality of base stations, and establishing a connection with the selected base station, wherein the phase pattern vector repeatedly changes the phase of the sequence at the repetition frequency.