Reference Oscillator Frequency Grouping for WCDMA Cell Search
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Solution Overview
Problem
The existing frequency adjustment methods for reference oscillation signals in WCDMA systems face challenges in accurately correcting the frequency error between the reference oscillation signal and the carrier signal, leading to imprecise calibration and unsatisfactory detection rates during the initial cell search procedure.
Innovation Solution
A frequency adjustment method that divides the frequency scan section into groups of consecutive scan frequencies, performs correlation calculations on each group, and selects a target frequency group based on weighted accumulation results to determine the adjusted oscillation frequency, improving the detection rate and accuracy of frequency correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frequency adjustment methods are used in WCDMA systems, then the frequency error correction process is simple, but the detection rate and accuracy of frequency correction are unsatisfactory
Solution Approach 1:
The patent divides the frequency scan section into multiple groups, where each group contains several consecutive scan frequencies. Instead of evaluating each frequency individually, the system performs correlation calculations on grouped frequencies and uses weighted accumulation to determine the optimal frequency. This segmentation approach improves detection accuracy by reducing false positives while maintaining computational efficiency.
2Reliability
If the frequency scan section is divided into multiple groups with correlation calculations, then the detection rate improves, but the calculation complexity increases
Solution Approach 1:
The patent merges multiple correlation calculation results within each frequency group through weighted accumulation. By combining the results from multiple scan frequencies within a group, the system achieves more reliable detection with higher detection rate. The weighted accumulation process integrates information from multiple frequencies, improving robustness against individual frequency variations while managing computational load through structured grouping.
Data Source
AI summary
A frequency adjustment method is provided for adjusting a frequency of a reference oscillating signal from an initial oscillation frequency to an adjusted oscillation frequency. The frequency adjustment method includes steps of: dividing a frequency scan section into M scan frequencies; down-converting a signal according to the M scan frequencies to obtain M down-converted signals; performing a correlation calculation operation on the M down-converted signals, respectively, to obtain M correlation results; grouping the M scan frequencies into N frequency groups each containing P selected frequencies, with the P selected frequencies corresponding to P consecutive scan frequencies; performing a group calculation on the N frequency groups, respectively, to obtain N group calculation results; and selecting a target frequency group from the N frequency groups according to the N group calculations results, and obtaining the adjusted oscillation frequency from the target frequency group.