Method and device for improving phase measurement accuracy

Patent metadata

Field	Value
Publication number	US-11525849-B2
Application number	US-201917281970-A
Country	US
Kind code	B2
Filing date	Oct 12, 2019
Priority date	Oct 19, 2018
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A method and device for increasing an accuracy of a phase measurement, wherein the method includes: receiving a measurement signal; performing a frequency-domain transformation to the measurement signal to obtain a frequency-domain measurement sequence; determining phases that correspond to frequency-domain measurement signals, and determining a phase difference between the frequency-domain measurement signals that correspond to two neighboring specified frequency points; according to the phases, the phase difference and a window function, performing a sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain phase-fitting data that correspond to sliding windows; and according to the phase-fitting data of the sliding windows, determining phase-calibration data that correspond to the sliding windows, and, by using the phase-calibration data of the sliding windows, forming phase-calibration data within a specified frequency band. The method reduces an error of fitting, and increases an accuracy of a phase calibration.

First claim

What is claimed is:

1. A method for increasing an accuracy of a phase measurement, comprising:
receiving a measurement signal, wherein the measurement signal is generated according to a frequency-domain calibration sequence, the frequency-domain calibration sequence comprises N frequency-domain calibration signals, each of the N frequency-domain calibration signals corresponds to one specified frequency point, specified frequency points are within a specified frequency band, and N is an integer greater than 1;
performing a frequency-domain transformation to the measurement signal to obtain a frequency-domain measurement sequence, wherein the frequency-domain measurement sequence comprises N frequency-domain measurement signals, and each of the N frequency-domain measurement signals corresponds to one specified frequency point;
determining phases corresponding to the N frequency-domain measurement signals, and determining a phase difference between the N frequency-domain measurement signals corresponding to two neighboring specified frequency points;
according to the phases, the phase difference and a window function, performing a sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain phase-fitting data corresponding to sliding windows; and
according to the phase-fitting data of the sliding windows, determining phase-calibration data corresponding to the sliding windows, and, by using the phase-calibration data of the sliding windows, forming the phase-calibration data within the specified frequency band.

2. The method according to claim 1 , wherein the step of, according to the phases, the phase difference and the window function, performing the sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain the phase-fitting data corresponding to the sliding windows comprises:
by using the window function, according to a preset sliding step length, sliding on the frequency-domain measurement sequence; and
after a corresponding sliding window is obtained after each time of sliding, according to the phases and the phase difference, performing a linear fitting to the phases of the N frequency-domain measurement signals within the corresponding sliding window, to obtain the phase-fitting data of the sliding windows.

3. The method according to claim 2 , wherein the phase-fitting data comprise a phase-linear-fitting function, and
the step of, according to the phases and the phase difference, performing the linear fitting to the phases of the N frequency-domain measurement signals within the corresponding sliding window, to obtain the phase-fitting data of the sliding windows comprises:
according to the phases corresponding to the N frequency-domain measurement signals within each sliding window of the sliding windows, determining an initial phase value;
according to the phase difference between the N frequency-domain measurement signals corresponding to the two neighboring specified frequency points within the each sliding window, determining a fitting slope; and
according to the initial phase value and the fitting slope, determining the phase-linear-fitting function corresponding to the each sliding window.

4. The method according to claim 1 , wherein the step of determining the phases corresponding to the N frequency-domain measurement signals, and determining the phase difference between the N frequency-domain measurement signals corresponding to the two neighboring specified frequency points comprises:
performing a channel estimation to the frequency-domain measurement sequence, to obtain frequency-domain channel responses corresponding to the N frequency-domain measurement signals, wherein each of the frequency-domain channel responses corresponds to one specified frequency point;
determining the phases corresponding to the frequency-domain channel responses; and
according to the phases corresponding to the frequency-domain channel responses, determining the phases corresponding to the N frequency-domain measurement signals and the phase difference between the N frequency-domain measurement signals corresponding to the two neighboring specified frequency points.

5. The method according to claim 4 , wherein the step of determining the phases corresponding to the frequency-domain channel responses comprises:
performing a tune-domain transformation individually to the frequency-domain channel responses, to obtain corresponding time-domain functions;
performing a windowing-and-noise-suppression processing individually to the corresponding time-domain functions;
performing a frequency-domain transformation individually to the corresponding time-domain functions that have been windowing-and-noise-suppression-processed, to obtain frequency-domain functions; and
calculating to obtain the phases corresponding to the frequency-domain functions.

6. A device for increasing an accuracy of a phase measurement, wherein the device comprises:
a signal receiving module configured for receiving a measurement signal, wherein the measurement signal is generated according to a frequency-domain calibration sequence, the frequency-domain calibration sequence comprises N frequency-domain calibration signals, each of the N frequency-domain calibration signals corresponds to one specified frequency point, specified frequency points are within a specified frequency band, and N is an integer greater than 1,
a frequency-domain transforming module configured for performing a frequency-domain transformation to the measurement signal to obtain a frequency-domain measurement sequence, wherein the frequency-domain measurement sequence comprises N frequency-domain measurement signals, and each of the N frequency-domain measurement signals corresponds to one specified frequency point;
a phase determining module configured for determining phases corresponding to the N frequency-domain measurement signals, and determining a phase difference between the N frequency-domain measurement signals corresponding to two neighboring specified frequency points;
a phase fitting module configured for, according to the phases, the phase difference and a window function, performing a sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain phase-fitting data corresponding to sliding windows; and
a calibration-data determining module configured for, according to the phase-fitting data of the sliding windows, determining phase-calibration data corresponding to the sliding windows, and, by using the phase-calibration data of the sliding windows, forming the phase-calibration data within the specified frequency band.

7. The device according to claim 6 , wherein the phase fitting module comprises:
a sliding module configured for, by using the window function, according to a preset sliding step length, sliding on the frequency-domain measurement sequence; and
a phase fitting module configured for, after a corresponding sliding window is obtained after each time of sliding, according to the phases and the phase difference, performing a linear fitting to the phases of the N frequency-domain measurement signals within the corresponding sliding window, to obtain the phase-fitting data of the sliding windows.

8. The device according to claim 7 , wherein the phase-fitting data comprise a phase-linear-fitting function, and
the phase fitting module is configured for,
according to the phases corresponding to the N frequency-domain measurement signals within each sliding window of the sliding windows, determining an initial phase value;
according to the phase difference between the N frequency-domain measurement signals corresponding to the two neighboring specified frequency points within the each sliding

Assignees

• Datang mobile communications equipment co ltd

Inventors

• Zhang Yong
• Shi Jing

Classifications

• G01R23/16 Primary

  Spectrum analysis; Fourier analysis · CPC title

• H04L1/24

  Testing correct operation · CPC title

• H04L25/0202

  Channel estimation · CPC title

• G01R25/00 Primary

  Arrangements for measuring phase angle between a voltage and a current or between voltages or currents · CPC title

• H04L25/022

  of frequency response · CPC title