CN102647373B - Method and device for correcting unmatching of same phase/orthogonal signals in communication circuit - Google Patents
Method and device for correcting unmatching of same phase/orthogonal signals in communication circuit Download PDFInfo
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Abstract
The invention provides a method and device for correcting the unmatching of same phase/orthogonal signals in a communication circuit, which relate to a method and a relevant device for correcting the unmatching between the same phase/orthogonal signals between the communication circuits in the communication circuit. The same phase test signal and the orthogonal test signal with different frequency contents are utilized to correct the unmatching of the signals of the relevant frequency in the communication circuit.
Description
Technical field
The present invention relates to radio communication, espespecially for correcting unmatched method between in-phase signal wherein and orthogonal signalling and relevant apparatus in a direct up-conversion reflector (direct up-conversion transmitter).
Background technology
In wireless communication technology, telecommunication circuit (as: reflector or receiver) is used to information defeated for tendency to develop and carrier modulation, and utilizes antenna to be transmitted, or by from antenna the signal that receives carry out demodulation, to read information wherein.Traditional reflector includes the different framework of many kinds, and wherein a kind of common framework is be direct up-conversion reflector (direct up-conversion transmitter).Simple functions block schematic diagram about this reflector please refer to Fig. 1.As shown in the figure, direct up-conversion reflector 100 has an in-phase path 110 (In-phase channel) and an orthorhombic phase path 120 (Quadrature channel), wherein comprises again digital to analog converter 111 and 121, low pass filter 112 and 122, frequency mixer 113 and 123, adder 130, power amplifier 140 and an antenna 150 respectively.In in-phase path 110, a digital baseband in-phase signal BBIt can be input to after digital to analog converter 111 carries out conversion process, then is input to low pass filter 112 and carries out filtering process.Finally, carry out mixing by frequency mixer 113 and a same-phase local oscillated signal LOIt, to produce a simulation high frequency in-phase signal AnIt.Similarly, in orthorhombic phase path 120, a digital baseband orthogonal signalling BBQt also by similar process, and can carry out mixing by frequency mixer 123 and a quadrature phase local oscillated signal LOQt, and then produces a simulation high frequency orthogonal signalling AnQt.Then, by adder 130, power amplifier 140 and antenna 150, be added simulation high frequency in-phase signal AnIt with high frequency orthogonal signalling AnQt, and signal amplifies, with transmission.
The framework of this direct up-conversion, owing to having with low cost, the plurality of advantages such as power consumption is less and circuit area is less, is therefore used in various radio communication device widely.But its shortcoming is undesirable high frequency characteristics, reason may be inphase/orthogonal path not mating in analog end, and this coupling comprises; Gain between in-phase signal with orthogonal signalling is not mated, phase place is not mated or path (time of delay) is not mated.And in single carrier wave modulating system, gain between in-phase signal with orthogonal signalling is not mated will cause there is obvious visible distortion in planisphere (as being originally the planisphere of foursquare 64-QAM, to cause transmission distortion because not mating, last planisphere may become rectangle).Moreover, not mating between in-phase signal with orthogonal signalling, more can cause unintended image interference (image interference), thus the signal to noise ratio (SNR) that the system that has a strong impact on can reach, cause loss and error vector magnitude (the error vector magnitude of information further, EVM) with the lifting of the error rate (bit error rate, BER).
And in technical field belonging to the present invention, also there is the multiple correlation technique in order to solve the problem.Such as, U.S. patent application case (application number 20020015450) just proposes the method and apparatus that a kind of phase place with deciding the inphase/orthogonal modulator revised in reflector does not mate the unmatched correlation-corrected parameter with amplitude.Include one homophase/quadrature modulator and an adjuster in the reflector of this case, this adjuster is used for correcting the phase place caused because of inphase/orthogonal modulator and does not mate and do not mate with amplitude.Moreover, this case is to the defeated inphase/orthogonal test signals samples of institute's tendency to develop, and then analog/digital conversion is carried out to signal sampling, and transfer to produce homophase and cross feedback signal with solution to signal sampling is capable, and not mate with phase place based on determined amplitude and produce amplitude and phase correction parameters.Another kind of technology then utilizes an envelope detector (envelope detector) detect the output of conveyer and utilize circuit to amplify detected envelope.And for homophase and orthogonal signalling, the envelope detector of high frequency can with frequency F
bBthe spectral components (caused based on carrier wave) at place and frequency 2xF
bBthe spectral components (do not mate based on inphase/orthogonal and caused) at place produce after filtering with amplify after fundamental frequency ripple.And the control information of amplitude and phase place can be used to destroy in advance modulate after signal.
But, the greatest problem of these correlation techniques is that it only not to mate with phase place for amplitude and corrects, and these were had nothing to do with the frequency of fundamental frequency signal by not mating of causing of frequency mixer (113 and 123) and local oscillated signal (LOIt and LOQt).But in fact, even if after amplitude and the unmatched correction of phase place complete, telecommunication circuit 100 often still exists the undesirable property of high frequency, this is because the correcting mode in correlation technique have ignored and not the mating of frequency dependence.Therefore, when the fundamental frequency signal of input changes frequency or is applied to the communication system of broad frequency band, the homophase in telecommunication circuit 100 and quadrature path mismatch problem will appear in one's mind again again.This not mating with frequency dependence, may be analog converter 111 and 121 in different path and the circuit characteristic difference between low pass filter 112 and 122, the time of delay caused mate.But, in field belonging to the present invention, do not have correlation technique to solve this problem yet.
Summary of the invention
The object of the invention is to solve the frequency dependence mismatch problem between inphase/orthogonal phase path.In addition, in different embodiments of the invention, correct utilizing the test signal including more than one frequency content not mating.
One of the present invention embodiment provides the in-phase signal in a kind of correction one telecommunication circuit not mate the method for (I/Q mismatch) with orthogonal signalling.The method comprises: providing package contains one first test signal corresponding to the composition of a first frequency and one second test signal, be wherein an in-phase signal one of in this first, second test signal, and another is orthogonal signalling; Correct this first test signal according to current first correction parameter, to produce the rear test signal of one first adjustment, wherein this current first correction parameter corresponds to time of delay; And carry out one first correction parameter adjustment operation, wherein this first correction parameter adjustment operation comprises again: provide one first to add and signal, this first adds with signal by respectively by according to the one first homophase analog signal that produces of test signal after this first adjustment and the one first orthorhombic phase analog signal that produces according to this second test signal, carry out a mixing operation with a same-phase local oscillated signal and a quadrature phase local oscillated signal respectively, and the result being added this mixing operation produced; To this first add and signal carry out a self-mixing (self-mixing) operation to produce one first measured signal; And upgrade this current first correction parameter according to this first measured signal in one first performance number corresponding to one first characteristic frequency.Wherein, when one first specified conditions reach, terminate this first correction parameter adjustment operation; Otherwise, repeat this first correction parameter adjustment operation
One embodiment of the invention provide the in-phase signal in a kind of correction one telecommunication circuit not mate (In-phase/Quadrature phase mismatch with orthogonal signalling, I/Q mismatch) device, this device providing package contains corresponding to one first test signal of the composition of a first frequency and one second test signal to this telecommunication circuit, be wherein an in-phase signal one of in this first, second test signal, and another is orthogonal signalling.This device comprises; One correcting unit, a detecting unit and a correction parameter adjustment unit.This correcting unit receives this first test signal and this second test signal respectively, and in order to correct this first test signal according to current first correction parameter, to produce the rear test signal of one first adjustment, wherein this current first correction parameter corresponds to time of delay.This detecting unit is in order to add one first and signal carries out a self-mixing operation to produce one first measured signal, and in order to calculate this first measured signal in one first performance number corresponding to one first characteristic frequency, wherein this first add with signal by this telecommunication circuit respectively by frequency mixer will according to this first, one first analog signal (the first homophase analog signal Ana_I1) that after second adjustment, test signal produces and one second analog signal (the first orthorhombic phase analog signal Ana_Q1), mixing is carried out with a first carrier (same-phase local oscillated signal LoIt) and one second carrier wave (quadrature phase local oscillated signal LoQt), and the result being added this mixing by an adder produced.This correction parameter adjustment unit is coupled to this correcting unit and this detecting unit, and in order to carry out one first correction parameter adjustment operation according to this first performance number to upgrade this current first correction parameter.Wherein, when one first specified conditions reach, this correction parameter adjustment unit terminates to carry out this first correction parameter adjustment operation; Otherwise this correction parameter adjustment unit repeats this first correction parameter adjustment operation.
Accompanying drawing explanation
Fig. 1 illustrates the reflector of known direct up-conversion framework.
Fig. 2 illustrates the function block schematic diagram of an embodiment of apparatus of the present invention.
Fig. 3 illustrates the function block schematic diagram of another embodiment of apparatus of the present invention.
Fig. 4 illustrates the schematic flow sheet of an embodiment of the inventive method.
Fig. 5 illustrates the schematic flow sheet adjusting this current first correction parameter in the inventive method according to this first performance number.
Fig. 6 illustrates the schematic flow sheet of another embodiment of the inventive method.
Fig. 7 illustrates the frequency spectrum of a signal specific.
Fig. 8 illustrates the frequency spectrum of another signal specific.
Fig. 9 A and Fig. 9 B illustrates the graph of a relation of image-frequency rejection ratio and frequency.
Primary clustering symbol description
100 reflectors
110,120 paths
111,121,241,242 digital to analog converters
112,122,223,243,244, low pass filter
113,123,221,245,246 frequency mixers
130,247,333 adders
140 power amplifiers
222 variable gain amplifiers
150 antennas
20 devices
210,310 correcting units
220 detecting units
230 correction parameter adjustment units
211,311,312 correcting circuits
224 analog-to-digital converters
225 fast Fourier transform unit
240 telecommunication circuits
410 ~ 460,510 ~ 550,610 ~ 650 steps
Embodiment
Some vocabulary is employed to censure specific assembly in the middle of specification and follow-up claims.In affiliated field, those of ordinary skill should be understood, and hardware manufacturer may call same assembly with different nouns.This specification and follow-up claims are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " mentioned in the middle of specification and follow-up claim is in the whole text an open term, therefore should be construed to " comprise but be not limited to ".
In addition, " couple " word comprise directly any at this and be indirectly electrically connected means.Therefore, if describe a first device in literary composition to be coupled to one second device, then represent this first device and directly can be electrically connected in this second device, or be indirectly electrically connected to this second device by other device or connection means.
Moreover will arrange in pairs or groups below different embodiment and relevant indicators of concept of the present invention is described.Wherein, there is the assembly of identical label or device in difference diagram represent it and have similar operating principle and technology effect.Therefore literary composition will omit describing of repeatability below.In addition, the different technologies feature possessed in different embodiment in literary composition, not only can be implemented in this embodiment.In fact, in reasonable category of the present invention, by the suitable amendment to certain specific embodiment, possesses technical characteristic specific to other embodiment to make it.
First, the principle of correction of the present invention will first be introduced below.Refer again to Fig. 1, as previously mentioned, due in the digital to analog converter 111 in in-phase path 110 and low pass filter 112 and orthorhombic phase path 120 digital to analog converter 112 with low pass filter 114 because of the property difference of circuit unit, can cause producing different delays to input signal.If with fundamental frequency in-phase signal BBIt for cos (ω
mt) and fundamental frequency orthogonal signalling BBQt be sin (ω
mt) (wherein, ω
m=2 π f
m) be example, then the delay that this path is different can cause the signal exported by low pass filter 112 and low pass filter 114 to change into cos (ω
m) and sin (ω (t+t0)
mt), wherein to represent two path delay-time difference different for t0, by with frequencies omega
mbe multiplied, therefore in-phase signal BBIt=cos (ω
m(t+t0)) with orthogonal signalling BBQt=sin (ω
mt), can exist between two signals and not mate (phase place) factor ω by what cause time of delay
m* t
0, and this one does not mate the frequencies omega being proportional to fundamental frequency signal
m.
Now, if consider the property difference between frequency mixer 113 and 123 in the lump, and an a same-phase local oscillated signal LoIt and quadrature phase local oscillated signal LoQt is set as (1+g) respectively
with sin (ω
lOt) (wherein g,
represent that in-phase path 110 is not mated with amplitude between orthorhombic phase path 120, phase place do not mate respectively), then the analog radio-frequency signal that the adder 130 in telecommunication circuit 100 exports can be expressed as
thus, can obtain telecommunication circuit 100 the image-frequency rejection ratio (image rejection ration, IMR) that produces be:
Image-frequency rejection ratio refers to that in frequency be f
lO-f
mthe average power of image signal at place, than on be f in frequency
lO+ f
mthe average power of the main up-conversion signal at place.From above formula, the not matching degree between inphase/orthogonal path can affect image-frequency rejection ratio seen by telecommunication circuit 100 output, and image-frequency rejection ratio is less, represents that the matching degree between inphase/orthogonal path is higher.Therefore, can according to the index of image-frequency rejection ratio as the inphase/orthogonal route matching degree of assessment signal.And from above formula, difference time of delay that the power of image frequency signal and the frequency mixer in inphase/orthogonal two path do not mate with the gain that local oscillated signal causes, phase place and the digital to analog converter in inphase/orthogonal two path and low pass filter cause is relevant.Therefore, concept of the present invention is first to correct did not mate with the time of delay of frequency dependence, and the gain that correction is irrelevant with frequency more afterwards, phase place are not mated.Wherein, unmatched degree is reached by the watt level of observing the two times of fundamental frequency signals be associated with image frequency signal.
Please refer to Fig. 2, it is the function block schematic diagram of first embodiment of apparatus of the present invention.Apparatus of the present invention 20 include correcting unit 210, detecting unit 220 and a correction parameter adjustment unit 230.Wherein, apparatus of the present invention 20 are in order to correct a telecommunication circuit 240.Telecommunication circuit 240 includes the digital to analog converter 241 and 242 belonging to in-phase path and quadrature path respectively, low pass filter 243 and 244, frequency mixer 245 and 246, homophase local oscillated signal LoIt and orthorhombic phase local oscillated signal LoQt, and an adder 247.At the beginning of correction, correcting unit 210 first can receive fundamental frequency homophase test signal BBIt and fundamental frequency orthogonal test signals BBQt, and wherein homophase test signal BBIt and orthogonal test signals BBQt includes the ingredient f of a first frequency
m, (as: BBIt=cos (2 π f
mt), BBQt=sin (2 π f
mt)), and be used as one first initial current correction parameter Para_1 according to the preset value that correction adjustment parameters unit 230 provides, to set the first correcting circuit 211 (carrying out unmatched correction time of delay), and then homophase test signal BBIt is corrected in advance.Should be noted that, because not mating between inphase/orthogonal path is the concept that symbolic animal of the birth year is right, therefore, in other embodiments of the present invention, also the first correcting circuit 211 can be utilized to correct orthogonal test signals BBQt, to eliminate not mating between inphase/orthogonal path.
Then, apparatus of the present invention 20 can adjust the first current correction parameter Para_1, to obtain a correction result repeatedly by following operation.So-called optimum apjustment effect refer to by the first correcting circuit 211 make image-frequency rejection ratio (IMR) to the graph of a relation of frequency can by Fig. 9 B (that is, image-frequency rejection ratio is proportional to the frequency of signal) be transformed into Fig. 9 A (that is the frequency of image-frequency rejection ratio and signal is uncorrelated).After the first correcting circuit 211 corrects homophase test signal BBIt according to current first correction parameter, correcting unit 210 can export the homophase test signal BBIt ' after adjustment with not controlled orthogonal test signals BBQt to telecommunication circuit 240.Afterwards, these two signals can be input to analog converter 241 and 242 and low pass filter 243 and 244 respectively, and then produce one first homophase analog signal Ana_I1 and one first orthorhombic phase analog signal Ana_Q1 respectively.Wherein, if when current first correction parameter Para_1 has reached an optimum value, then there is not mating of time of delay between the first homophase analog signal Ana_I1 with the first orthorhombic phase analog signal Ana_Q1, the relation of image-frequency rejection ratio to frequency will as shown in Figure 9 A.
First homophase analog signal Ana_I1 and the first orthorhombic phase analog signal Ana_Q1 is sent to frequency mixer 245,246 respectively, mixing is carried out with a same-phase local oscillated signal LoIt, a quadrature phase local oscillated signal LoQt, and by adder 247, add and signal S1 to produce one first according to the result of mixing.The main purpose of detecting unit 220 is to detect that telecommunication circuit 240 exports first adds and the power (target of actual observation is the watt level of the two times of fundamental frequency signals be associated with image frequency watt level) corresponding to image frequency composition in signal S1.Therefore, detecting unit 220 can observe the frequency spectrum of output signal after self-mixing of telecommunication circuit 240.Please refer to above Fig. 7, in theory, what telecommunication circuit 240 exported first adds and is positioned at for frequency (f with image frequency composition B in its frequency spectrum of signal S1
lo-f
m) place, so detecting unit 220 ought to observe frequency spectrum in corresponding performance number herein.And ought enough hour of power herein, then represent that the unmatched situation of inphase/orthogonal path signal is appropriately corrected.But, because frequency is herein high frequency f
lo, the power that therefore will calculate the spectral components at this place is not easy.Therefore detecting unit 220 of the present invention first to be added first by frequency mixer 221 and carries out self-mixing (being multiplied with self) with signal S1 and produce one first measured signal S1 ', wherein, the frequency spectrum of the first measured signal S1 ' can with reference to below in figure 7.Due to the result be multiplied with self, will at frequency 2f
mthe corresponding spectral components A*B of place's generation one.Wherein A value represents main up-conversion signal (f
lO+ f
m) spectral components, B is image frequency signal (f
lO-f
m) spectral components, setting A value is a unit-sized, then at frequency 2f
mit the spectral components equivalence at place is the spectral components size of image frequency signal.Due to frequency 2f
mcompared to frequency (f
lo-f
m) obvious lower (f
mfor fundamental frequency, f
lofor hundreds of MHz is to the rf frequency of number GHz), therefore calculate this place's power comparatively easy.So the present invention utilizes observation first measured signal S1 ' changed power herein to adjust the first current parameter Para_1, and is just the frequency of oscillation f of fundamental frequency homophase test signal BBIt and fundamental frequency orthogonal test signals BBQt herein
mtwice.So the present invention can calculate the first measured signal at frequency 2f
mone first performance number that place is corresponding.
In order to calculate this first performance number, first measured signal S1 ' is inputed to low pass filter 223 again by detecting unit 220 after variable gain amplifier 222 amplifies, radio-frequency component in this measure filtering first measured signal S1 ', retain wherein low-frequency component (as respective frequencies 2f
mcomposition).Afterwards, undertaken obtaining this first performance number by analog-to-digital converter 224 and fast Fourier transform unit 225.Correction parameter adjustment unit 230 can receive this first performance number that detecting unit 220 calculates, and carries out one first correction parameter adjustment operation according to this first performance number.Wherein, correction parameter adjustment unit 230 can upgrade this current first correction parameter in each operation, and when one first specified conditions reach, terminates to carry out this first correction parameter adjustment operation; Otherwise, repeat this first correction parameter adjustment operation.
Wherein these specified conditions may correspond to the size of carrying out number of times or this first performance number of the first correction parameter adjustment operation.For example, if the first correction parameter adjustment operation has been carried out quite repeatedly, then quite may reach a satisfied correction result, therefore correction parameter adjustment unit 230 terminates to carry out this first correction parameter adjustment operation.Or, when the first performance number is less than a predetermined value, then also may be corrected validly with not mating of frequency dependence between inphase/orthogonal path, therefore correction parameter adjustment unit 230 also terminates to carry out this first correction parameter adjustment operation.And when these situations all do not reach, then correction parameter adjustment unit 230 can repeatedly carry out this first correction parameter adjustment operation, until not mating between inphase/orthogonal path corrected validly.
The corresponding method flow of above apparatus of the present invention is illustrated in Fig. 4, wherein comprises;
Step 410: providing package contains one first test signal corresponding to the composition of a first frequency and one second test signal be wherein an in-phase signal one of in this first, second test signal, and another is orthogonal signalling;
Step 420: correct this first test signal according to current first correction parameter, to produce the rear test signal of one first adjustment, wherein this current first correction parameter corresponds to time of delay;
Step 430: provide one first to add and signal, this first adds with signal by respectively by according to the one first homophase analog signal (Ana_I1) that produces of test signal after this first adjustment and the one first orthorhombic phase analog signal (Ana_Q1) that produces according to this second test signal, carry out a mixing operation with a same-phase local oscillated signal (LoIt) and a quadrature phase local oscillated signal (LoQt), and the result being added this mixing operation produced;
Step 440: this first to be added and signal (S1) carries out a self-mixing (self-mixing) operation to produce one first measured signal (S1 ');
Step 450: upgrade this current first correction parameter according to one first performance number of this first measured signal corresponding to one first characteristic frequency (as: two times of fundamental frequencies);
Step 460: whether one first specified conditions reach?
Wherein, in step 460, can judge whether that the first specified conditions reach, when reaching if fail, then can return in step 420, again adjust this first test signal according to this current first correction parameter after renewal, and recalculate this first performance number, until these first specified conditions are satisfied.
Moreover the adjustment mode about the first correction parameter please refer to Fig. 5 shownschematically flow chart.First, after step 510 starts execution, then step 520 can be entered, the default initial value of correction parameter adjustment unit 230 is utilized to set the first correction parameter Para_1, and correcting unit 210 just can adjust one in test signal BBIt and BBQt accordingly, to produce test signal after an adjustment, and detected the first measured signal S1 ' produced according to this by follow-up testing circuit 220 and be twice in first performance number at fundamental frequency place.And in step 530, whether this first performance number that can detect in this first correction parameter adjustment operation is greater than this first performance number in previous first correction parameter adjustment operation, select one first adjustment mode or the second adjustment mode.If the first performance number of this operation is greater than the first performance number of previous operation, just enters step 532, otherwise just enter step 531.If flow process enters step 532, namely represent current first correction parameter in this first correction parameter adjustment operation and not yet in effectly improve not mating of time of delay, then needing the adjustment mode changing this current first correction parameter.For example, if in previous first correction parameter adjustment operation be this current first correction parameter of a reduction (as: the second adjustment mode), then this first correction parameter adjustment operation is necessary for this current first correction parameter of an increase (as: the first adjustment mode), and vice versa.And if enter step 531, this current first correction parameter namely represented in this first correction parameter adjustment operation improves not mating of causing time of delay really, does not therefore need the adjustment mode changing this current first correction parameter.For example, if be one downgrade this current first correction parameter (as: second adjustment mode) in previous first correction parameter adjustment operation, then this also continues to downgrade this current first correction parameter (as: the second adjustment mode), in like manner for the first adjustment mode.In brief, if enter step 532, then select and be different from previous adjustment mode, enter step 531 and then continue to use and be same as previous adjustment mode.
It should be noted that the present invention does not limit to some extent to the adjusting range of this current first correction parameter in each first correction parameter adjustment operation.For example, in one embodiment, be the carrying out accelerating to correct, the more efficient and coarse adjustment that adjusting range is larger (rough tuning) may be carried out at the correction initial stage, and over time, carry out comparatively accurately and the less fine setting (fine tuning) of adjusting range.Or in an embodiment again, the amplitude that in each first correction parameter adjustment operation, this current first correction parameter increases may be asymmetric with the amplitude of minimizing.
In another embodiment of the present invention, in order to energy Integral correction and frequency dependence and incoherent impact of not mating telecommunication circuit 240, and correcting mode is applied to wider band system, therefore in test signal, add the composition of second frequency, follow-up testing circuit 220 can be detected, and the power at different frequency place in frequency spectrum allly between inphase/orthogonal path signal not to mate to eliminate.In this embodiment, homophase test signal BBIt will be cos (ω
m1t)+cos (ω
m2t) and orthogonal test signals BBQt will be sin (ω
m1t)+sin (ω
m2that is now homophase test signal BBIt includes first frequency ω t),
m1corresponding composition cos (ω
m1and second frequency ω t)
m2corresponding composition cos (ω
m2t), similarly, orthogonal test signals BBQt is also identical situation.Thus, what the adder 247 of telecommunication circuit 240 exported second adds and with signal S2 will be
now, to eliminate not mating in such telecommunication circuit, then necessary first observation signal frequency spectrum is at two frequency multiplication place (2*f
m1or 2*f
m2) performance number, the first correction parameter Para_1 be delayed corresponding to the time, with not mating of first correcting that different path delay time between inphase/orthogonal path causes.Then, then observation signal frequency spectrum at frequency (f
m1+ f
m2) performance number at place, to adjust one second correction parameter and one the 3rd correction parameter (gain and the phase place in the inphase/orthogonal path of causing corresponding to frequency mixer and local oscillated signal are not mated).In detail, please refer to Fig. 8, top is second add the frequency spectrum with signal S2, do not mate if need understand and whether properly corrected, then must to observe in frequency spectrum the performance number corresponding to image frequency composition B and b relevant to two kinds of fundamental frequency test signals respectively, but be same as preceding embodiment, this image frequency composition B and b is positioned at high frequency part, therefore not easily calculates its performance number.So must self-mixing mode be passed through, produce one second measured signal S2 ', and observe in its frequency spectrum the power comprising and be associated with image frequency composition.Wherein, the present invention, when the corrective delay, the time did not mate, utilizes two frequency multiplication places (2 π f
m1or 2 π f
m2) first performance number A*B or a*b corresponding to relevant to image frequency composition, and when correcting amplitude and not mating with phase place, utilize frequency (f
m1+ f
m2) A*b+a*B performance number that place's image frequency composition corresponding to two fundamental frequencies is relevant.
Fig. 3 illustrates the device corresponding to the present embodiment.Wherein the second correcting circuit 311 of correcting unit 310 and the 3rd correcting circuit 312, do not mate with the gain corrected respectively between inphase/orthogonal path and do not mate with phase place, it adjusts with a current 3rd correction parameter Para_3 (not mating corresponding to phase place) based on a current second correction parameter Para_2 (not mating corresponding to gain) respectively.Should be noted that, because not mating between inphase/orthogonal path is the concept that symbolic animal of the birth year is right, therefore, in other embodiments of the present invention, also second, third correcting circuit 311 and 312 can be utilized to correct orthogonal test signals BBQt, to eliminate not mating between inphase/orthogonal path.
First, correcting unit 310 can first utilize the first correcting circuit 211 to complete correction unmatched with the time of delay of frequency dependence.And such program is same as the flow process of previous embodiment, therefore separately do not repeat at this.In brief, when these first specified conditions reach, then correction parameter adjustment unit 230 no longer adjusts current first correction parameter Para_1, then starts to carry out phase place and the unmatched correction of amplitude.Wherein, homophase test signal BBIt can through such first correcting circuit 211 and the adjustment of the second correcting circuit 311 and the homophase test signal BBIt ' after producing adjustment, in addition, homophase test signal BBIt is added with orthogonal test signals BBQt through the adjustment of the 3rd correcting circuit 312 and produces the orthorhombic phase test signal BBQt ' after adjusting, then can by the path in telecommunication circuit 240 respectively at low pass filter 243, 244 produce one second homophase analog signal Ana_I2, one second orthorhombic phase analog signal Ana_Q2, again respectively through frequency mixer 245, 246 with local oscillated signal LoIt, LoQt carries out mixing, both add up generation one second through adder 247 and add and signal S2, detecting unit 220 then first adds second and signal S2 carries out self-mixing, to produce one second measured signal S2 '.Further, detecting unit 220 can according to the second measured signal S2 ' in frequency (f
m1+ f
m2) spectral components corresponding to place, produce one second performance number, correction parameter adjustment unit 230 then carries out the one second and the 3rd correction parameter adjustment and operates, it upgrades current second correction parameter Para_2 and current 3rd correction parameter Para_3 according to the second performance number in each operation, wherein in each second and the 3rd during correction parameter adjustment operates, correction parameter adjustment unit 230 upgrades the one in current second correction parameter Para_2 and current 3rd correction parameter Para_3.In other words, correction parameter adjustment unit 230 upgrades current second correction parameter Para_2 and current 3rd correction parameter Para_3 in turn.Further, when one second specified conditions reach, correction parameter adjustment unit 230 terminate carry out this second and the 3rd correction parameter adjustment operate; Otherwise correction parameter adjustment unit 230 repeatedly carry out this second and the 3rd correction parameter adjustment operate.Wherein, these second specified conditions correspond to this second and the 3rd execution number of times of operating of correction parameter adjustment, or the size that this second performance number is current.Method flow about the present embodiment is summarized in Fig. 6, because the details of wherein step is similar in appearance to the flow chart of Fig. 4, therefore does not separately repeat at this.
Generally speaking, the test signal that the present invention has several radio-frequency component by input to telecommunication circuit, with observe its not matching effect on the impact of the output signal of telecommunication circuit.And again by repeatedly adjusting the mode of correction parameter, with the time at the changed power being twice in the output signal that observation is relevant to image frequency composition near fundamental frequency, find out best correction parameter, do not mate to eliminate all relevant to fundamental frequency/incoherent inphase/orthogonal phase paths in telecommunication circuit.
The foregoing is only the embodiment of the present invention, all according to the equalization change that claims of the present invention did and modification, all should belong to the covering scope of the present invention.
Claims (22)
1. the in-phase signal corrected in a telecommunication circuit does not mate the method for (an In-phase/Quadrature phase mismatch, I/Q mismatch) with orthogonal signalling, comprises:
Providing package contains one first test signal corresponding to a first frequency composition and one second test signal, be an in-phase signal one of in wherein said first test signal, described second test signal, and another is orthogonal signalling;
Correct described first test signal according to current first correction parameter, to produce the rear test signal of one first adjustment, wherein said current first correction parameter corresponds to time of delay; And
Carry out one first correction parameter adjustment operation:
One first is provided to add and signal, described first adds with signal by adjusting the one first homophase analog signal that rear test signal produces and the one first orthorhombic phase analog signal produced according to described second test signal by according to described first respectively, carry out a mixing operation with a same-phase local oscillated signal and a quadrature phase local oscillated signal, and the result being added described mixing operation produced; And
Add described first and signal carry out a self-mixing (self-mixing) operation to produce one first measured signal; And upgrade described current first correction parameter according to one first performance number of described first measured signal corresponding to one first characteristic frequency;
When one first specified conditions reach, terminate described first correction parameter adjustment operation; Otherwise repeat described first correction parameter adjustment operation, until described first specified conditions are satisfied, wherein, described first specified conditions correspond to the size that described first correction parameter adjustment operates number of times or described first performance number of carrying out.
2. method according to claim 1, the step wherein upgrading described current first correction parameter comprises:
One is selected to adjust described current first correction parameter in one first adjustment mode and one second adjustment mode.
3. method according to claim 2, wherein said first adjustment mode includes and described current first correction parameter is added one first adjustment parameter, and described second adjustment mode includes described current first correction parameter is deducted one second adjustment parameter.
4. method according to claim 3, wherein said first adjustment parameter has different sizes in the first different correction parameter adjustment operations, and described second adjustment parameter has different sizes in the first different correction parameter adjustment operations.
5. method according to claim 2, wherein in described first adjustment mode and described second adjustment mode, select one to adjust the step of described current first correction parameter to include:
When one current first correction parameter adjustment operation carry out time described first performance number be not more than a previous first correction parameter adjustment operate described first performance number of carrying out time, be same as described previous first correction parameter adjustment operate in adjustment mode to upgrade described current first performance number; And
When described current first correction parameter adjustment operation carry out time described first performance number be greater than one previous first correction parameter adjustment operation carry out time described first performance number time, be different from described previous first correction parameter adjustment operation in adjustment mode to upgrade described current first performance number.
6. method according to claim 1, wherein after described first correction parameter adjustment operation has repeated a pre-determined number, then judges that described first specified conditions reach.
7. method according to claim 1, wherein when described first performance number corresponding to a current first correction parameter adjustment operation is less than a predetermined value, then judges that described first specified conditions reach.
8. method according to claim 1, wherein said first characteristic frequency is the twice of described first frequency.
9. method according to claim 1, wherein said first test signal, the second test signal include again the composition corresponding to a second frequency respectively, and described second frequency is different from described first frequency.
10. method according to claim 9, also includes:
Described first test signal is corrected according to current second correction parameter and current 3rd correction parameter, to produce the rear test signal of described first adjustment and the rear test signal of one second adjustment, wherein said current second correction parameter and described current 3rd correction parameter correspond respectively to amplitude and phase place; And
Carry out the one second and the 3rd correction parameter adjustment to operate:
One second is provided to add and signal, described second adds and one second homophase analog signal, the one second orthorhombic phase analog signal of signal by producing according to test signal after test signal, the second adjustment after described first adjustment, carry out a mixing operation with described same-phase local oscillated signal and described quadrature phase local oscillated signal respectively, and the result being added described mixing operation produced;
To add described second and signal carries out a self-mixing operation to produce one second measured signal; And
Upgrade described current second correction parameter and described current 3rd correction parameter according to one second performance number of described second measured signal corresponding to one second characteristic frequency, wherein each second and the 3rd correction parameter adjustment operate one that upgrades in described current second correction parameter and described current 3rd correction parameter;
When one second specified conditions reach, terminate described second and the 3rd parameter adjustment operate; Otherwise, repeat described second and the 3rd parameter adjustment operate, wherein, described second specified conditions correspond to described second and the 3rd correction parameter adjustment operate the size of number of times or described second performance number of carrying out.
11. methods according to claim 10, wherein said second characteristic frequency is described first frequency and described second frequency sum.
12. 1 kinds of in-phase signals corrected in a telecommunication circuit do not mate (In-phase/Quadrature phase mismatch with orthogonal signalling, I/Q mismatch) device, providing package contains corresponding to one first test signal of the composition of a first frequency and one second test signal to described telecommunication circuit, be an in-phase signal one of in wherein said first test signal, described second test signal, and another is orthogonal signalling, described device comprises;
One correcting unit, receive described first test signal and described second test signal respectively, in order to correct described first test signal according to current first correction parameter, to produce the rear test signal of one first adjustment, wherein said current first correction parameter corresponds to time of delay;
One detecting unit, in order to add one first and signal carries out a self-mixing operation to produce one first measured signal, and calculate one first performance number of described first measured signal corresponding to one first characteristic frequency, wherein said first adds the one first homophase analog signal will produced according to test signal after described first adjustment respectively by described telecommunication circuit with signal, and according to the one first orthorhombic phase analog signal that described second test signal produces, mixing is carried out by frequency mixer and a same-phase local oscillated signal and a quadrature phase local oscillated signal, and the result being added described mixing by an adder produced, and
One correction parameter adjustment unit, be coupled to described correcting unit and described detecting unit, in order to carry out one first correction parameter adjustment operation according to described first performance number to upgrade described current first correction parameter, wherein when one first specified conditions reach, described correction parameter adjustment unit terminates to carry out described first correction parameter adjustment operation; Otherwise described correction parameter adjustment unit repeats described first correction parameter adjustment operation, and wherein, described first specified conditions correspond to the size that described first correction parameter adjustment operates number of times or described first performance number of carrying out.
13. devices according to claim 12, wherein said correction parameter adjustment unit selects one to adjust described current first correction parameter in one first adjustment mode and one second adjustment mode.
14. devices according to claim 13, wherein when described correction parameter adjustment unit selects described first adjustment mode, described current first correction parameter is added one first adjustment parameter by described correction parameter adjustment unit, and when described correction parameter adjustment unit selects described second adjustment mode, described current first correction parameter is deducted one second adjustment parameter by described correction parameter adjustment unit.
15. devices according to claim 14, wherein said first adjustment parameter has different sizes in the first different correction parameter adjustment operations, and described second adjustment parameter has different sizes in the first different correction parameter adjustment operations.
16. devices according to claim 13, wherein:
When described correction parameter adjustment unit carry out one current first correction parameter adjustment operation time described first performance number be not more than described correction parameter adjustment unit carry out one previous first correction parameter adjustment operation time described first performance number time, described correction parameter adjustment unit be same as described previous first correction parameter adjustment operation carry out time adjustment mode to upgrade described current first performance number; And
When described correction parameter adjustment unit carry out described current first correction parameter adjustment operation time described first performance number be greater than described correction parameter adjustment unit carry out described previous first correction parameter adjustment operation time described first performance number time, described correction parameter adjustment unit be different from described previous first correction parameter adjustment operation carry out time adjustment mode to upgrade described current first performance number.
17. devices according to claim 12, if wherein described correction parameter adjustment unit repeated described first correction parameter adjustment operation reach a pre-determined number after, then described correction parameter adjustment unit judges that described first specified conditions reach.
18. devices according to claim 12, if described first performance number that wherein described correction parameter adjustment unit carries out when a current first correction parameter adjustment operates is less than a predetermined value, then described correction parameter adjustment unit judges that described first specified conditions reach.
19. devices according to claim 12, wherein said first characteristic frequency is the twice of described first frequency.
20. devices according to claim 12, first, second test signal described that wherein said device provides also includes the composition corresponding to a second frequency respectively, and described second frequency is different from described first frequency.
21. devices according to claim 20, wherein said correcting unit also corrects described first test signal according to current second correction parameter and current 3rd correction parameter, to produce the rear test signal of described first adjustment, and produce the rear test signal of one second adjustment, wherein said current second correction parameter and described current 3rd correction parameter correspond respectively to amplitude and phase place, and described telecommunication circuit is by adjusting rear test signal according to described first respectively, after second adjustment, test signal produces one second homophase analog signal and one second orthorhombic phase analog signal, and described second homophase analog signal and described second orthorhombic phase analog signal are come and a same-phase local oscillated signal respectively by frequency mixer, one quadrature phase local oscillated signal carries out a mixing operation, and the result generation one second being added described mixing operation adds and signal, described detecting unit in order to add described second and signal carries out a self-mixing operation to produce one second measured signal, and calculates described second measured signal in one second performance number corresponding to one second characteristic frequency, described correction parameter adjustment unit operates in order to carry out the one second and the 3rd correction parameter adjustment, it upgrades described current second correction parameter and described current 3rd correction parameter according to described second performance number, wherein at each second and the 3rd during correction parameter adjustment operates, described correction parameter adjustment unit upgrades one in described current second correction parameter and described current 3rd correction parameter, and when one second specified conditions reach, described correction parameter adjustment unit no longer carry out described second and the 3rd parameter adjustment operate, otherwise, described correction parameter adjustment unit repeat described second and the 3rd parameter adjustment operate, wherein, described second specified conditions correspond to described second and the 3rd correction parameter adjustment operate the size of number of times or described second performance number of carrying out.
22. devices according to claim 21, wherein said second characteristic frequency is described first frequency and described second frequency sum.
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| CN106330796A (en) * | 2015-07-01 | 2017-01-11 | 晨星半导体股份有限公司 | Mismatching compensation device and method, and mismatching detection device |
| CN110868227B (en) * | 2018-08-28 | 2022-02-25 | 瑞昱半导体股份有限公司 | Transmission circuit capable of measuring image rejection ratio of transmission end |
| TWI819181B (en) * | 2020-01-06 | 2023-10-21 | 瑞昱半導體股份有限公司 | Transceiver and transceiver calibration method |
| CN113179138B (en) * | 2020-01-09 | 2023-02-24 | 瑞昱半导体股份有限公司 | Transceiver and transceiver calibration method |
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