CN-121417999-B - Channel correction method and device based on special design signals and electronic equipment

CN121417999BCN 121417999 BCN121417999 BCN 121417999BCN-121417999-B

Abstract

The invention provides a channel correction method, device and electronic equipment based on special design signals, wherein the method comprises the steps of transmitting original special design signals through a transmitter, receiving the original special design signals by a receiving end after transmission through a transmission channel to be corrected, obtaining received signals, carrying out correlation calculation and least square estimation based on the received signals and the original special design signals, obtaining delay, amplitude and phase parameters of the transmission channel to be corrected, and correcting the transmission channel to be corrected based on the delay, amplitude and phase parameters, wherein the frequency spectrum of the original special design signals is distributed at intervals in a frequency band, and the original special design signals are orthogonal with the mirror image of the original special design signals in a frequency domain. According to the invention, the special design signals with frequency spectrums distributed at intervals in the frequency band are designed, so that the signals are orthogonal with the images in the frequency domain. By carrying out correlation calculation on the signals, the image interference can be effectively stripped, and the channel estimation precision is improved.

Inventors

HU TIANWEI
DU YUANYUAN
HUANG YUE
JIA PENGCHENG
KONG XIANGMING

Assignees

广州程星通信科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251229

Claims (8)

1. A channel correction method based on a special design signal, comprising: Transmitting the original special design signal through a transmitter, transmitting the original special design signal through a transmission channel to be corrected, and receiving the original special design signal by a receiving end to obtain a receiving signal; based on the received signal and the original special design signal, carrying out correlation calculation and least square estimation to obtain delay, amplitude and phase parameters of the transmission channel to be corrected; Correcting the transmission channel to be corrected based on the delay, the amplitude and the phase parameter; The frequency spectrums of the original special design signals are distributed at intervals in a frequency band, and the original special design signals and the mirror images of the original special design signals are orthogonal in the frequency domain; The correlation calculation comprises the following steps: calculating a cross-correlation function Ryx (t) between said received signal and said original specially designed signal, X is the original special design signal of the transmitting end, y is the receiving signal, and tau is the channel delay; determining a channel delay tau by detecting a maximum correlation point based on the cross-correlation function Ryx (t); calculating a channel coefficient h by using a least square method based on the channel delay tau, and further calculating the amplitude and the phase parameter based on the channel coefficient h; the calculating a channel coefficient h by using a least square method, and further calculating the amplitude and the phase parameter based on the channel coefficient h, includes: Circularly shifting the original special design signal by the channel delay tau to obtain an aligned signal, solving an equation taking the aligned signal as input and the received signal as output by using a least square method to obtain a complex form channel coefficient h, The superscript H represents the conjugate transpose, and the superscript-1 represents the inversion; And calculating a module value of the channel coefficient h as the amplitude of the transmission channel to be corrected, and calculating a argument of the channel coefficient h as the phase parameter of the transmission channel to be corrected.
2. The special design signal based channel correction method of claim 1, further comprising: Setting system parameters, wherein the system parameters comprise a sampling rate fs, a subcarrier spacing scs, a bandwidth bw, a sequence period point number nfft and a sideband frequency point number nssb, the sequence period point number nfft =fs/scs, the sideband frequency point number nssb =floor (nfft/2), and the floor represents a downward rounding; Defining a frequency domain sequence container based on the system parameters, and setting the positions of a positive half-axis frequency point and a negative half-axis frequency point as non-zero values and the rest positions as zero values in the frequency domain sequence container; performing inverse Fourier transform on the set frequency domain sequence container to obtain a time domain signal; And normalizing and fixing the time domain signal to generate the original special design signal for the transmitter.
3. The channel correction method based on a specially designed signal according to claim 1, wherein the determining the channel delay τ by detecting the maximum correlation point includes: And detecting the maximum peak value of the cross-correlation function Ryx (t), and taking the time delay corresponding to the maximum peak value as the channel time delay tau.
4. The channel correction method based on a special design signal according to claim 1, wherein the frequency domain sequence of the original special design signal is set with non-zero values at intervals on a positive frequency axis and a negative frequency axis, and frequency points outside the non-zero values are set with zero values, so that in a channel where image interference exists, the original special design signal and an image of the original special design signal can be orthogonalized on the frequency domain to eliminate an image term.
5. A channel correction device based on a special design signal, characterized by being applied to the channel correction method based on a special design signal as claimed in any one of claims 1 to 4, comprising: The receiving and transmitting module is used for transmitting the original special design signal through the transmitter, transmitting the original special design signal through a transmission channel to be corrected, and receiving the original special design signal by the receiving end to obtain a received signal; The calculation module is used for carrying out correlation calculation and least square estimation based on the received signal and the original special design signal to obtain delay, amplitude and phase parameters of the transmission channel to be corrected; the correction module is used for correcting the transmission channel to be corrected based on the delay, the amplitude and the phase parameter; the frequency spectrums of the original special design signals are distributed at intervals in a frequency band, and the original special design signals are orthogonal with the mirror images of the original special design signals in the frequency domain.
6. An electronic device comprising a memory, a processor and a program or instructions stored on the memory and executable on the processor, characterized in that the processor, when executing the program or instructions, implements the steps of the channel correction method based on special design signals as claimed in any one of claims 1 to 4.
7. A computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the special design signal based channel correction method of any one of claims 1 to 4.
8. A channel correction system based on a specially designed signal, comprising: The signal generating unit is used for generating an original special design signal and specifically comprises setting system parameters, wherein the system parameters comprise a sampling rate fs, a subcarrier interval scs, a bandwidth bw, a sequence period point number nfft and a sideband frequency point number nssb, the sequence period point number nfft =fs/scs, the sideband frequency point number nssb =floor (nfft/2) is expressed by floor and is rounded downwards, defining a frequency domain sequence container based on the system parameters, setting the position of a positive half-axis frequency point and the position of a negative half-axis frequency point in the frequency domain sequence container as non-zero values, setting the rest positions as zero values, carrying out inverse Fourier transform on the set frequency domain sequence container to obtain a time domain signal, carrying out normalization and fixed point treatment on the time domain signal to generate the original special design signal for a transmitter, and enabling the original special design signal to be orthogonal with the mirror image of the original special design signal in a frequency domain; A transmitter for transmitting the original special design signal; the receiver is used for receiving the signal transmitted by the transmission channel to be corrected and acquiring a received signal; the processing unit is used for calculating a cross-correlation function Ryx (t) between the received signal and the original special design signal, determining channel delay tau by detecting a maximum correlation point based on the cross-correlation function Ryx (t), calculating a channel coefficient h by using a least square method based on the channel delay tau, further calculating amplitude and phase parameters of the transmission channel to be corrected based on the channel coefficient h, and comprises circularly shifting the original special design signal by the channel delay tau to obtain an aligned signal, solving an equation taking the aligned signal as an input and the received signal as an output by using a least square method to obtain a complex form channel coefficient h, calculating a modulus value of the channel coefficient h as the amplitude of the transmission channel to be corrected, and calculating a argument of the channel coefficient h as the phase parameter of the transmission channel to be corrected.

Description

Channel correction method and device based on special design signals and electronic equipment Technical Field The present invention relates to the field of large digital array calibration technologies, and in particular, to a channel correction method and apparatus based on a special design signal, and an electronic device. Background With the development of phased array technology, large digital arrays are increasingly used in the communication fields of satellite vehicles, satellites and the like. Ideally, all channels in the array should have perfectly uniform amplitude-frequency characteristics (amplitude-frequency response) and phase-frequency characteristics (phase-frequency response). The high consistency among channels is the key for ensuring the system performance, and directly determines the upper performance limit of the core algorithm such as the pointing precision, the side lobe level, the null depth and the like of the beam forming. However, there are amplitude and phase errors, i.e., channel errors, between the channels due to manufacturing tolerances, temperature drift, device aging, and Printed Circuit Board (PCB) routing differences among the components themselves. The traditional channel correction method (such as a correlation algorithm and a least square method) is effective when the channel condition is good, but in a high-image distortion environment, signals and images are overlapped on a frequency spectrum, so that correction accuracy is obviously reduced. In the prior art, although beam synthesis and digital correction can be realized in the CN119696708a and CN120639206a, when there are a large number of images in the channel, the conventional signal cannot distinguish the signal and the image, and the signal and the image are superimposed together on the spectrum, and when the image is larger, the channel correction algorithm such as correlation is continuously used, so that an accurate channel correction coefficient cannot be obtained, and the problem of image interference cannot be effectively solved. Disclosure of Invention The invention provides a channel correction method and device based on special design signals and electronic equipment, which are used for solving the defect that the prior art cannot effectively solve the problem of image interference, and achieving the aims of effectively stripping the image interference and improving the channel estimation precision. The invention provides a channel correction method based on special design signals, which comprises the following steps: Transmitting the original special design signal through a transmitter, transmitting the original special design signal through a transmission channel to be corrected, and receiving the original special design signal by a receiving end to obtain a receiving signal; based on the received signal and the original special design signal, carrying out correlation calculation and least square estimation to obtain delay, amplitude and phase parameters of the transmission channel to be corrected; Correcting the transmission channel to be corrected based on the delay, the amplitude and the phase parameter; the frequency spectrums of the original special design signals are distributed at intervals in a frequency band, and the original special design signals are orthogonal with the mirror images of the original special design signals in the frequency domain. The channel correction method based on the special design signal provided by the invention further comprises the following steps: Setting system parameters, wherein the system parameters comprise a sampling rate fs, a subcarrier spacing scs, a bandwidth bw, a sequence period point number nfft and a sideband frequency point number nssb, the sequence period point number nfft =fs/scs, the sideband frequency point number nssb =floor (nfft/2), and the floor represents a downward rounding; Defining a frequency domain sequence container based on the system parameters, and setting the positions of a positive half-axis frequency point and a negative half-axis frequency point as non-zero values and the rest positions as zero values in the frequency domain sequence container; performing inverse Fourier transform on the set frequency domain sequence container to obtain a time domain signal; and normalizing and fixing the time domain signal to generate the original special design signal for the transmitter. According to the channel correction method based on the special design signal, the correlation calculation comprises the following steps: Calculating a cross-correlation function Ryx (t) between the received signal and the original specially designed signal; determining a channel delay tau by detecting a maximum correlation point based on the cross-correlation function Ryx (t); And calculating a channel coefficient h by using a least square method based on the channel delay tau, and further calculating the amplitude and the phase parameter based on the channe