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Correction method of radio frequency mixer for random demodulation system

A random demodulation and correction method technology, applied in the direction of multi-frequency modulation transformation, etc., can solve problems such as changes in hardware characteristics, and achieve the effect of perfect reconstruction

Pending Publication Date: 2020-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the hardware structure of the RD system is very simple, there are still some technical problems in its physical implementation, especially when the frequency reaches the radio frequency domain, the hardware characteristics have changed a lot

Method used

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  • Correction method of radio frequency mixer for random demodulation system
  • Correction method of radio frequency mixer for random demodulation system
  • Correction method of radio frequency mixer for random demodulation system

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Experimental program
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Effect test

specific Embodiment 1

[0056] Step 1: Mathematically model the non-ideal characteristics in the RF mixer, introduce the non-ideal characteristics in the mixer, and digitally model the random demodulation system;

[0057] Step 2: Set the start frequency, step frequency and number of steps, initialize the count variable, the real part and the imaginary part of the perception matrix, and filter the measured signal;

[0058] Step 3: Set the input signal frequency to f i A sinusoidal signal with an amplitude of 1, input the initial value of the pseudo-random sequence signal, and keep the initial value of the pseudo-random sequence signal unchanged;

[0059] Step 4: uniformly sample the output signal of the system, the sampling rate and sampling time are the same as those of the random demodulation system, and obtain the sampling value;

[0060] Step 5: Add the sampling value to the i-th column of the imaginary part of the perception matrix to obtain the imaginary part Θ of the perception matrix Θ im ; ...

specific Embodiment 2

[0096] Step 1: Mathematical modeling of non-idealities in RF mixers such as figure 2 As shown, the non-ideal characteristics of the mixer in the RD system mainly include standing waves at the LO and RF ports, LO-RF isolation, and LO-IF isolation. The former will cause attenuation of the input signal, and the latter two Otherwise, the input signal under test and the output IF signal will contain the signal component of the mixing function. Among them, r RF (f) The ratio of the output to the input after the RF port signal of the mixer is reflected; w LR (f) indicates the feedthrough degree from the mixer LO port to the RF port; r S (f) is the ratio of the output to the input after the reflection of the front-end RF device; d(f) represents the frequency conversion loss of the mixer; w LI (f) indicates the degree of feedthrough from the LO port to the IF port.

[0097] Step 2: Digitally model the stochastic demodulation system by introducing non-idealities in the mixer

[00...

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Abstract

The invention relates to a correction method of a radio frequency mixer for a random demodulation system. The invention belongs to the technical field of radio frequency mixer correction, and the method comprises the steps: carrying out the mathematical modeling of non-ideal characteristics in a radio frequency mixer, introducing the non-ideal characteristics in the mixer, and carrying out the digital modeling of a random demodulation system; setting an initial frequency and an input signal frequency; carrying out uniform sampling on the system output signal, wherein the sampling rate and thesampling time are the same as those of a random demodulation system; obtaining a sampling value; and constructing a sensing matrix to realize signal correction. According to the invention, the problemthat signals cannot be reconstructed due to large deviation between a sensing matrix of an actual system and an ideal condition caused by non-ideal difference between an actual radio frequency mixerand an ideal mixer is solved, and perfect reconstruction of the signals can be realized.

Description

technical field [0001] The invention relates to the technical field of radio frequency mixer correction, and relates to a correction method for a radio frequency mixer of a random demodulation system. Background technique [0002] Richard Baraniuk of Rice University and his research team proposed a random demodulation (Random Demodulation, RD) system in 2006, which is a technology and method to extend the compressive sensing theory to the analog domain. Its hardware structure is as follows: figure 1 As shown, its hardware structure mainly includes a mixer, a filter and a pseudo-random sequence generator, and its processing flow mainly includes four steps of frequency mixing, low-pass filtering, uniform sampling, and signal reconstruction. [0003] Although the hardware structure of the RD system is very simple, there are still some technical problems in its physical implementation, especially when the frequency reaches the radio frequency domain, the hardware characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
CPCH03D7/16
Inventor 付宁乔立岩闫振龙李晓东彭喜元
Owner HARBIN INST OF TECH