Method and device for calibrating IQ signal
A signal and technology to be calibrated, applied in the shaping network of the transmitter/receiver, digital transmission system, baseband system components, etc., can solve the problem of consuming large multiplier and adder resources, etc.
Active Publication Date: 2020-06-19
广州全盛威信息技术有限公司 +1
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From the above, we can know that complex formulas such as Fourier transform and some trigonometric functions such as arccos need to be used, which consume a lot of multiplier and adder resources in hardware implementation.
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0021] see figure 1 , an embodiment of the present invention provides a method for calibrating an IQ signal, the method comprising:
[0022] S101: Blindly estimate the blind estimation calibration parameter W2 of the IQ signal to be calibrated online by calculating the average value of N quantities corresponding to the real part and the imaginary part of the complex multiplication result (as in figure 2 shown in ), set the complex signal y(n)=I+jQ and the conjugated complex signal y'(n)=I-jQ based on the IQ signal to be calibrated, where I and Q are respectively the The IQ signal at the nth point of the I-channel signal and the Q-channel signal, then the complex multiplication includes y(n) multiplied by y'(n) and y(n) multiplied by y(n) and 0 ≤n≤N-1;
[0023] S102: Update...
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The embodiment of the invention discloses a method and device for calibrating an IQ signal. The method comprises the following steps: carrying out the online blind estimation of the blind estimation calibration parameter of the IQ signal to be calibrated by calculating the average value of N quantities respectively corresponding to the real part and the imaginary part of the multiplication resultof the complex number; setting a complex signal y (n) = I + jQ and a conjugate complex signal y'(n) = I-jQ based on the IQ signal to be calibrated, wherein I and Q are respectively an I-path signal and a Q-path signal of the IQ signal to be calibrated at the nth point, and the complex multiplication comprises the multiplication of y(n) and y'(n) and the multiplication of y(n) and y(n), and n is greater than or equal to 0 and less than or equal to N-1; updating an existing calibration parameter into the blind estimation calibration parameter; and according to the blind estimation calibration parameter, pre-compensating an I-path signal and a Q-path signal of the IQ signal to be calibrated at the nth point to obtain a calibrated IQ signal, wherein n is greater than or equal to N.
Description
technical field [0001] The invention relates to the field of digital communication, in particular to a method and device for calibrating IQ signals. Background technique [0002] In wireless communication, the modulated signal is basically divided into two channels, I and Q, and there are strict requirements on the amplitude and phase of the signals of I and Q. If there is a difference in the amplitude of I and Q, it will cause Signal quality degrades. If it is a carrier such as OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), the carrier is required to be strictly orthogonal, otherwise serious inter-carrier interference will occur, so signal calibration in wireless communication seems to be Particularly important. Calibration solutions are usually implemented by first extracting the deviation (calibration parameters) of the signal I and Q, a...
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Login to View More IPC IPC(8): H04L27/36H04L25/03
CPCH04L27/364H04L25/03006
Inventor 周辉郑宇亮冯奎景
Owner 广州全盛威信息技术有限公司