CN105553902B - A kind of method and device of I/Q disequilibrium regulatings - Google Patents
A kind of method and device of I/Q disequilibrium regulatings Download PDFInfo
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- CN105553902B CN105553902B CN201511002771.5A CN201511002771A CN105553902B CN 105553902 B CN105553902 B CN 105553902B CN 201511002771 A CN201511002771 A CN 201511002771A CN 105553902 B CN105553902 B CN 105553902B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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Abstract
The invention discloses a kind of method and devices of I/Q disequilibrium regulatings, including obtaining multiple point-frequency signals, the point-frequency signal is outside useful signal band and performance number is more than the signal of power threshold, the frequency point position of the multiple point-frequency signal is asymmetric mutually, the multiple point-frequency signal is added in the first i/q signal to be corrected, the second i/q signal to be corrected is obtained, the described second i/q signal to be corrected, which is sent into mirror image correction module, to be corrected.By that can will solve the problems, such as to generate an image disturbing signal on symmetrical position centered on by carrier frequency point in the prior art in the first i/q signal to be corrected of the point-frequency signal addition outside the mutual asymmetric multiple useful signal bands of high power and frequency point position, and the problem of useful signal receives can be influenced to avoid both sides bottom occur after carrying out mirror image correction and making an uproar to be lifted.
Description
Technical field
The present invention relates to signal processing technology more particularly to a kind of method and devices of I/Q disequilibrium regulatings.
Background technology
In conventional digital communication, radio frequency (Radio Frequency, RF) signal enters receiving terminal day
Radiofrequency signal is converted to intermediate frequency (Intermediate Frequency, IF) signal by down-conversion technique, recycles IQ by line
Intermediate-freuqncy signal is converted with phase I/ orthogonal Q two-way baseband signal by demodulation techniques.As technology develops, either user still runs
Quotient is smaller and smaller to terminal receiving device volume requirement, therefore zero intermediate frequency technology also generates therewith.The basic think of of zero intermediate frequency technology
Think that RF signals are directly become baseband signal, without the modulation /demodulation of intermediate frequency, so as to cancel intermediate-frequency filter design,
Reduce the volume of receiving device.
Fig. 1 provides the functional block diagram of zero intermediate frequency technology, in zero intermediate frequency reciver, on the one hand due to local crystal oscillator and transmitting
Crystal oscillator deviation is held, baseband signal phase can be caused uneven with gain, i.e. in Fig. 1 in dotted line frameWith g；On the other hand, I/Q
Frequency mixer, low-pass filter (Low Pass Filter, LPF), variable gain amplifier (Programmable on access
Gain Amplifier, PGA) and analog-to-digital conversion (Analog-to-Digital Converter, ADC) device it is inconsistent
I/q signal can be caused uneven, i.e., the transmission function h in figureiWith hq；The factor of these two aspects eventually results in I/Q two-way base band
Signal is uneven, can generate an image disturbing signal on symmetrical position centered on by carrier frequency point, other to influence
The demodulation performance of channel signal, as shown in Figure 2.
Invention content
The embodiment of the present invention provides a kind of method and device of I/Q disequilibrium regulatings, to solve be with carrier frequency point
An image disturbing signal is led to the problem of on centrosymmetric position.
A kind of method of I/Q disequilibrium regulatings provided in an embodiment of the present invention, including：
Multiple point-frequency signals are obtained, the point-frequency signal is outside useful signal band and performance number is more than power threshold
The frequency point position of signal, the multiple point-frequency signal is asymmetric mutually；
The multiple point-frequency signal is added in the first i/q signal to be corrected, the second I/Q letters to be corrected are obtained
Number；
Described second i/q signal to be corrected is corrected.
Preferably, the multiple point-frequency signals of acquisition, including：
Obtain band stray signal；
The band stray signal is input to the Direct Digital Synthesizer, generates multiple point-frequency signals.
Preferably, generating multiple point-frequency signals according to formula (1)；
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is when sampling
Between, fiFor the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
Preferably, obtaining the described first i/q signal to be corrected according to following step：
Radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal；
By the i/q signal after amplifier amplifies, the first I/Q to be corrected is converted to by analog-digital converter and is believed
Number.
Preferably, obtaining second i/q signal to be corrected according to formula (2)；
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the width of the second i/q signal to be corrected
Degree, BiFor the amplitude of i-th of point-frequency signal, I (t) is the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiIt is i-th
The frequency point position of a point-frequency signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
Correspondingly, the embodiment of the present invention additionally provides a kind of device of I/Q disequilibrium regulatings, including：
Acquiring unit, for obtaining multiple point-frequency signals, the point-frequency signal is outside useful signal band and performance number
More than the signal of power threshold, the frequency point position of the multiple point-frequency signal is asymmetric mutually；
Processing unit obtains second and waits for for the multiple point-frequency signal to be added in the first i/q signal to be corrected
The i/q signal of correction；
Unit is corrected, for the described second i/q signal to be corrected to be corrected.
Preferably, the acquiring unit is specifically used for：
Obtain band stray signal；
The band stray signal is input to the Direct Digital Synthesizer, generates multiple point-frequency signals.
Preferably, the acquiring unit is specifically used for：
Multiple point-frequency signals are generated according to formula (1)；
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is when sampling
Between, fiFor the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
Preferably, the processing unit is specifically used for：
The described first i/q signal to be corrected is obtained according to following step：
Radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal；
By the i/q signal after amplifier amplifies, the first I/Q to be corrected is converted to by analog-digital converter and is believed
Number.
Preferably, the processing unit is specifically used for：
Second signal to be corrected is obtained according to formula (2)；
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the width of the second i/q signal to be corrected
Degree, BiFor the amplitude of i-th of point-frequency signal, I (t) is the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiIt is i-th
The frequency point position of a point-frequency signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
The embodiment of the present invention shows that, by obtaining multiple point-frequency signals, the point-frequency signal is outside useful signal band
And performance number is more than the signal of power threshold, the frequency point position of the multiple point-frequency signal is asymmetric mutually, by the multiple point
Frequency signal is added in the first i/q signal to be corrected, obtains the second i/q signal to be corrected, to be corrected by described second
I/q signal is sent into mirror image correction module and is corrected.By by high power and frequency point position asymmetric multiple useful letters mutually
It can be solved in the prior art in being with carrier frequency point in the first i/q signal to be corrected that point-frequency signal outside number band is added
An image disturbing signal is led to the problem of on the symmetrical position of the heart, and both sides can occurs to avoid after carrying out mirror image correction
Bottom, which is made an uproar, to be lifted, and the problem of useful signal receives is influenced.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of structural schematic diagram of zero intermediate frequency technology in the prior art；
Fig. 2 is a kind of schematic diagram of image disturbing signal in the prior art；
Fig. 3 is a kind of flow diagram of the method for I/Q disequilibrium regulatings provided in an embodiment of the present invention；
Fig. 4 a to Fig. 4 b are a kind of signal schematic representation of I/Q disequilibrium regulatings in the prior art；
Fig. 5 a to Fig. 5 b are a kind of signal schematic representation of I/Q disequilibrium regulatings in the embodiment of the present invention；
Fig. 6 a to Fig. 6 b are a kind of signal schematic representation of I/Q disequilibrium regulatings in the embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of the device of I/Q disequilibrium regulatings provided in an embodiment of the present invention.
Specific implementation mode
In order to keep the purpose, technical scheme and advantage of the application clearer, below in conjunction with attached drawing to the application make into
It is described in detail to one step, it is clear that described embodiment is only the application some embodiments, rather than whole implementation
Example.Based on the embodiment in the application, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall in the protection scope of this application.
In the embodiment of the present invention, the device of I/Q disequilibrium regulatings can be I/Q imbalance compensation devices, can also be
Mirror image correction module generates an Image interference centered on by carrier frequency point in the prior art for solving on symmetrical position
The problem of signal.
Fig. 3 shows that a kind of flow of I/Q disequilibrium regulatings in the embodiment of the present invention, the flow can be by I/Q injustice
The device of weighing apparatus correction executes.
As shown in figure 3, the flow specifically includes：
Step 301, multiple point-frequency signals are obtained.
Step 302, the multiple point-frequency signal is added in the first i/q signal to be corrected, it is to be corrected obtains second
I/q signal.
Step 303, the described second i/q signal to be corrected is corrected.
In step 301, multiple point-frequency signal is by obtaining band stray signal, i.e. useful signal band stray is believed
Number.By the band stray signal be input to Direct Digital Synthesizer (Direct Digital Synthesizer,
DDS), multiple point-frequency signals are generated by Direct Digital Synthesizer.
The point-frequency signal is outside useful signal band and performance number is more than the signal of power threshold, multiple point-frequency signals
Frequency point position is asymmetric mutually, multiple point-frequency signal can be 1,2,3,4 one until n, n is more than or equal to 1.It should
The both sides that can be located at local oscillator point of multiple point-frequency signals.The power threshold can be empirically arranged.
Specifically, multiple point-frequency signals can be generated according to formula (1).
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is when sampling
Between, fiFor the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
For example, the bit wide of sample rate f s=30.72Msps, useful bandwidth BW=20MHz, digital signal are bit
When width, two point-frequency signal f are obtained1、f2, the value of two point-frequency signals should be-fs/2<f1<- BW/2, BW/2<f2<
Fs/2, B1And B2Both greater than 2(bit width-2), f1≠±f2。
In step 302, to be corrected multiple point-frequency signal is added to first after obtaining multiple point-frequency signals
I/q signal in before, it is also necessary to radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal.Then by the I/
Q signal is converted to the first i/q signal to be corrected after amplifier amplifies, by analog-digital converter.By putting frequency by multiple
Signal is added in first i/q signal to be corrected, can obtain the second signal to be corrected.
Specifically, second signal to be corrected can be obtained according to formula (2).
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the width of the second i/q signal to be corrected
Degree, BiFor the amplitude of i-th of point-frequency signal, I (t) is the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiIt is i-th
The frequency point position of a point-frequency signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
In step 303, the second i/q signal to be corrected is sent into mirror image correction module and is corrected.
Fig. 4 a to Fig. 4 b show a kind of signal schematic representation of i/q signal correction in the prior art, and Fig. 4 a are to be corrected
Preceding signal schematic representation, as shown in fig. 4 a, the useful signal of input are located at local oscillator point, i.e., center position, the bottom on both sides are made an uproar
Power in -20dB or so.After carrying out i/q signal correction, as shown in Figure 4 b, the power that the bottom on both sides is made an uproar is in 0dB or so, quilt
It raises, is easy to influence the useful signal being located in this position on other channels.
For Fig. 5 a to Figure 5b shows that a kind of signal schematic representation of i/q signal correction in the embodiment of the present invention, Fig. 5 a are second
I/q signal to be corrected, as shown in Figure 5 a, there are two point frequency in figure, the position of a point frequency is at (- 11.94,90.3), separately
At (14.38,89.68), the power of the two point frequencies is relatively high, is much larger than the work(of useful signal for the position of one point frequency
Rate, to not interfere with the useful signal on other channels.The i/q signal to be corrected of second in Fig. 5 a is corrected it
Afterwards, as shown in Figure 5 b, essentially identical with signal shown in Fig. 5 a, there is no the bottoms on the useful signal both sides as shown in Fig. 4 b for signal
It makes an uproar and is lifted.
Fig. 6 a to Fig. 6 b show that a kind of signal schematic representation of i/q signal correction in the embodiment of the present invention has shown in Fig. 6 a
With signal not instead of at local oscillator point, deviate local oscillator point, can be generated centered on it is by local oscillator point on symmetrical position at this time
Mirror image, the mirror image can interfere the useful signal on other channels.Therefore, the i/q signal correction provided through the embodiment of the present invention
Method, which can be inhibited, as shown in Figure 6 b, Image interference is suppressed in figure, without protrusion, reach
The effect for having arrived mirror image correction, the bottom for useful signal both sides also do not occur are made an uproar the case where being lifted, and bottom, which is made an uproar, to be held essentially constant.
Above-described embodiment shows by obtaining multiple point-frequency signals, the point-frequency signal be outside useful signal band and
Performance number is more than the signal of power threshold, and the frequency point position of the multiple point-frequency signal is asymmetric mutually, by the multiple point frequency
Signal is added in the first i/q signal to be corrected, the second i/q signal to be corrected is obtained, by the described second I/Q to be corrected
Signal is sent into mirror image correction module and is corrected.By by high power and frequency point position asymmetric multiple useful signal bands mutually
It is right centered on by carrier frequency point in the prior art to be solved in the first i/q signal to be corrected that outer point-frequency signal is added
An image disturbing signal is led to the problem of on the position of title, and can be made an uproar to avoid there is both sides bottom after carrying out mirror image correction
It is lifted, influences the problem of useful signal receives.
Based on the same technical idea, Fig. 7 shows a kind of dress of I/Q disequilibrium regulatings provided in an embodiment of the present invention
It sets, which can execute the flow of I/Q disequilibrium regulatings.
As shown in fig. 7, the device specifically includes：
Acquiring unit 701, for obtaining multiple point-frequency signals, the point-frequency signal is outside useful signal band and power
Value is more than the signal of power threshold, and the frequency point position of the multiple point-frequency signal is asymmetric mutually；
Processing unit 702 obtains for the multiple point-frequency signal to be added in the first i/q signal to be corrected
Two i/q signals to be corrected；
Unit 703 is corrected, for the described second i/q signal to be corrected to be corrected.
Preferably, the acquiring unit 701 is specifically used for：
Obtain band stray signal；
The band stray signal is input to Direct Digital Synthesizer, generates multiple point-frequency signals.
Preferably, the acquiring unit 701 is specifically used for：
Multiple point-frequency signals are generated according to formula (1)；
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is when sampling
Between, fiFor the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
Preferably, the processing unit 702 is additionally operable to：
Radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal；
By the i/q signal after amplifier amplifies, the first I/Q to be corrected is converted to by analog-digital converter and is believed
Number.
Preferably, the processing unit 702 is specifically used for：
Second i/q signal to be corrected is obtained according to formula (2)；
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the width of the second i/q signal to be corrected
Degree, BiFor the amplitude of i-th of point-frequency signal, I (t) is the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiIt is i-th
The frequency point position of a point-frequency signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
The application is with reference to method, the flow of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out the application essence of the various modification and variations without departing from the application
God and range.In this way, if these modifications and variations of the application belong to the range of the application claim and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (6)
1. a kind of I/Q disequilibrium regulatings method, which is characterized in that including：
Multiple point-frequency signals are obtained, the point-frequency signal is outside useful signal band and performance number is more than the letter of power threshold
Number, the frequency point position of the multiple point-frequency signal is asymmetric mutually；
The multiple point-frequency signal is added in the first same phase I/ quadrature Q signals to be corrected, the second I/Q to be corrected is obtained
Signal；
Described second i/q signal to be corrected is corrected；
Before the multiple point-frequency signal is added to the described first i/q signal to be corrected, further include：
Radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal；The i/q signal is amplified by amplifier
Afterwards, the described first i/q signal to be corrected is converted to by analog-digital converter；
Second i/q signal to be corrected is obtained according to formula (2)；
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the amplitude of the second i/q signal to be corrected, BiFor
The amplitude of i-th of point-frequency signal, I (t) are the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiFor i-th point of frequency
The frequency point position of signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
2. the method as described in claim 1, which is characterized in that the multiple point-frequency signals of acquisition, including：
Obtain band stray signal；
The band stray signal is input to Direct Digital Synthesizer, generates multiple point-frequency signals.
3. method as claimed in claim 2, which is characterized in that generate multiple point-frequency signals according to formula (1)；
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is sampling time, fi
For the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
4. a kind of device of I/Q disequilibrium regulatings, which is characterized in that including：
Acquiring unit, for obtaining multiple point-frequency signals, the point-frequency signal is outside useful signal band and performance number is more than
The frequency point position of the signal of power threshold, the multiple point-frequency signal is asymmetric mutually；
Processing unit obtains for the multiple point-frequency signal to be added in the first same phase I/ quadrature Q signals to be corrected
Two i/q signals to be corrected；
Unit is corrected, for the described second i/q signal to be corrected to be corrected；
The processing unit is additionally operable to：
Radiofrequency signal frequency reducing is converted into baseband signal, and is separated into i/q signal；
By the i/q signal after amplifier amplifies, the first i/q signal to be corrected is converted to by analog-digital converter；
The processing unit is specifically used for：
Second signal to be corrected is obtained according to formula (2)；
The formula (2) is：
Wherein, data_in (t) is the value of the second i/q signal to be corrected, and A is the amplitude of the second i/q signal to be corrected, BiFor
The amplitude of i-th of point-frequency signal, I (t) are the value of I signal, and Q (t) is the value of Q signal, and t is sampling time, fiFor i-th point of frequency
The frequency point position of signal, fs are sample rate, and j is imaginary unit, and i is more than or equal to 1, n and is more than or equal to 1.
5. device as claimed in claim 4, which is characterized in that the acquiring unit is specifically used for：
Obtain band stray signal；
The band stray signal is input to Direct Digital Synthesizer, generates multiple point-frequency signals.
6. device as claimed in claim 5, which is characterized in that the acquiring unit is specifically used for：
Multiple point-frequency signals are generated according to formula (1)；
The formula (1) is：
Dds_out_i (t)=Bi*cos(2*π*fi*1e6*t/fs)+j*Bi*sin(2*π*fi*1e6*t/
fs)………………………………(1)
Wherein, dds_in_i (t) is the value of i-th of point-frequency signal, BiFor the amplitude of i-th of point-frequency signal, t is sampling time, fi
For the frequency point position of i-th of point-frequency signal, fs is sample rate, and j is imaginary unit, and i is more than or equal to 1.
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