CN101610230A - Signal imbalance compensation apparatus and method - Google Patents

Abstract

The invention provides a signal unbalance compensation device and a method, wherein the signal unbalance compensation device comprises: a signal imbalance detector (311, 313) for detecting a signal imbalance value of the input signal; a signal imbalance compensator (312, 314) for compensating for the signal imbalance of the input signal based on the signal imbalance value detected by the signal imbalance detector; a judging unit (401) for judging whether the input signal or the compensated signal compensated by the unbalance compensator is within a predetermined range; a signal unbalance detection signal generation unit (402) for outputting a start signal unbalance detection signal or a stop signal unbalance detection signal according to the judgment result of the judgment unit; when the signal imbalance detection signal generation unit outputs a stop signal imbalance detection signal, the signal imbalance detector (311, 313) outputs a signal imbalance value of the input signal detected previously.

Description

Signal imbalance compensation device and method

technical field

The present invention relates to a quadrature demodulator used in a quadrature receiver, in particular to a signal imbalance compensation device and method for estimating and compensating the phase imbalance and amplitude imbalance of IQ signals in the quadrature demodulator.

Background technique

Quadrature receivers use two separate branches to generate a vector signal, in which case errors in the phase shift (nominally 90 degrees) and magnitude mismatch between the simulated I and Q channels cause the I channel to The phase and amplitude imbalance between the signal and the Q channel signal is called IQ imbalance (or signal imbalance). When the IQ is unbalanced, crosstalk occurs between the in-phase channel and the quadrature channel.

For the IQ imbalance, a special training sequence or a method of estimating and then compensating by using the statistical characteristics of the received signal is usually used. Since the method of using the training sequence will increase the complexity of the system, it is a simpler solution to use the statistical characteristics of the received signal. FredHarris' article "Digital Filter Equalization of Analog Gain and PhaseMismatch in I-Q receiver" Universal Personal communications, 1996.Record, 1996 5th IEEE International Conference on, page 793-796 Vol.2 introduces a simple and easy-to-use method, which Phase and amplitude imbalances are estimated and compensated for using phase and amplitude gimbals. According to this article, US Patent US 7,187,725 discloses a method of compensating for phase and amplitude imbalances using a variable loop amplitude as a function of the average value of the error signal between the I-channel signal and the Q-channel signal.

和数字Q信道信号

，其中，k是表示信号采样序号的正整数。需要说明的是，虽然图1中没有示出，但为正确地进行接收操作起见，可能还需要其它组件，如滤波器、放大器等。本领域技术人员完全可以对此做出合适的布置。Fig. 1 is a schematic block diagram showing a quadrature demodulator according to the prior art. As shown in FIG. 1 , in the analog part (also referred to as the front-end part) 100, the signal splitter 101 divides the received RF/IF signal into a first signal part and a second signal part. The first signal part is sent to the first multiplier 102 and the second signal part is sent to the second multiplier 103 . The first multiplier 102 generates an I channel signal by mixing the first signal part with the carrier signal output from the local carrier generator 104 . The second multiplier 103 generates a Q channel signal by mixing the second signal portion with the carrier signal output from the local carrier generator 104 and phase-shifted by 90° by the 90° phase shifter 105 . The first analog-to-digital converter 106 and the second analog-to-digital converter 107 convert the analog I-channel signal and the analog Q-channel signal into digital I-channel signals respectively

and digital Q-channel signal

, where k is a positive integer representing the signal sampling number. It should be noted that, although not shown in FIG. 1 , other components, such as filters, amplifiers, etc., may be required for correct receiving operation. Those skilled in the art can make appropriate arrangements for this.

This analog part will cause phase imbalance and amplitude imbalance, for example, the signal divider 101 cannot divide the input signal into two identical parts, and the 90° phase shifter 105 cannot perform exactly 90° phase shift, etc.

，来补偿所述相位误差，从而生成相位补偿后的

；幅度失衡检测器113接收经相位补偿后的Q信道信号和I信道信号，检测它们之间的幅度失衡值并输出。幅度失衡补偿器114响应于从幅度失衡检测器113输出的幅度失衡值来补偿Q信道信号

的幅度，生成经相位及幅度补偿的信号。这里以I信道信号为基准信号。In the digital part 110 (including the signal imbalance compensation device and other baseband processing parts), the phase imbalance detector 111 receives the digital I channel signal and the digital Q channel signal, and detects the defects that may occur due to the defects of analog devices such as the 90° phase shifter 105. The phase error, so as to output the phase imbalance value. Phase imbalance compensator 112 modifies the digital Q channel signal in response to the phase imbalance value output by phase imbalance detector 111

, to compensate for the phase error, resulting in a phase-compensated

; Amplitude imbalance detector 113 receives the Q channel signal after phase compensation and I channel signal, detect the amplitude imbalance value between them and output. The amplitude imbalance compensator 114 compensates the Q channel signal in response to the amplitude imbalance value output from the amplitude imbalance detector 113

amplitude to generate a phase- and amplitude-compensated signal . Here, the I channel signal is taken as the reference signal.

The phase- and amplitude-compensated signals are sent to other baseband processing parts 115 for subsequent processing.

Fig. 2 shows a typical implementation of a signal imbalance compensation device according to the prior art, which can be referred to Fred Harris's article "Digital Filter Equalization of Analog Gain and Phase Mismatch in IQ receiver" Universal Personal communications, 1996.Record, 1996 5th IEEE International Conference on, page 793-796 Vol.2. In FIG. 2, the phase imbalance detector 200 is equivalent to the phase imbalance detector 111 in FIG. 1, the phase imbalance compensator 210 is equivalent to the phase imbalance compensator 112 in FIG. 1, and the amplitude imbalance detector 220 is equivalent to the amplitude The unbalance detector 113 and the amplitude unbalance compensator 230 are equivalent to the amplitude unbalance compensator 114 in FIG. 1 . The multiplier 201 outputs the current phase error e(k), the multiplier 202 adjusts the size of the error, the adder 203 and the delay holder 204 constitute a phase imbalance value output unit and outputs the current phase imbalance value $\widehat{\mathrm{\α}}\left(k\right)=\widehat{\mathrm{\α}}(k-1)+{\mathrm{\μ}}_1\×\tilde{I}\left(k\right)\×\tilde{Q}\left(k\right)$ The phase imbalance compensator 210 is composed of a multiplier 211 and an adder 212. According to the phase imbalance value output by the phase imbalance detector, the phase imbalance of the Q channel signal is compensated based on the I channel signal. The absolute value generator 221, the absolute value generator 222 and the adder 223 output the current amplitude error d(k), the multiplier 224 adjusts the error size, the adder 225 and the delay holder 226 form an amplitude imbalance value output unit and output the current amplitude imbalance value $\widehat{\mathrm{\γ}}\left(k\right)=\widehat{\mathrm{\γ}}(k-1)+{\mathrm{\μ}}_2\×\left(\right|\tilde{I}\left(k\right)|-|\tilde{Q}\left(k\right)\left|\right)$ Amplitude imbalance compensator 230 is made up of multiplier 231, according to the amplitude imbalance value that amplitude imbalance detector outputs, take I channel signal as the amplitude imbalance of reference compensation Q channel signal, where μ ₁ is the loop gain of phase imbalance estimation loop, μ ₂ is the loop gain of the amplitude imbalance estimation loop. In order to ensure the stability of the loop, their values are usually less than 1.

At present, there is an important defect in the method of using the statistical characteristics of the input signal to estimate and compensate IQ imbalance. When the input signal passes through some nonlinear devices such as digital-to-analog converters, its statistical characteristics will be changed, resulting in errors in the estimation of IQ imbalance. As a result, the entire amplitude and phase compensation mechanism fails.

Contents of the invention

The present invention has been made in view of the above problems. The present invention provides an apparatus and method for compensating IQ phase and amplitude imbalance in a quadrature receiver to overcome one or more problems caused by the limitations and shortcomings of the prior art, and at least provide a beneficial s Choice.

Specifically, the present application provides the following inventions.

Invention 1. A signal imbalance compensation device, which comprises:

a signal imbalance detector, configured to detect a signal imbalance value of an input signal;

a signal imbalance compensator, configured to compensate the signal imbalance of the input signal according to the signal imbalance value detected by the signal imbalance detector;

a judging unit, configured to judge whether the input signal or the compensated signal compensated by the imbalance compensator is within a predetermined range;

a signal imbalance detection signal generating unit, outputting a start signal imbalance detection signal or a stop signal imbalance detection signal according to the judgment result of the judgment unit;

When the signal imbalance detection signal generation unit outputs a stop signal imbalance detection signal, the signal imbalance detector outputs a previously detected signal imbalance value of the input signal.

Invention 2. The signal imbalance compensation device according to Invention 1, wherein the judging unit judges the input signal or the compensated signal by judging the position of the input signal or the compensated signal on the IQ plane. Whether the compensation signal is within the predetermined range.

Invention 3. The signal imbalance compensation device according to Invention 2, wherein the predetermined range is a range in which the I coordinate on the IQ plane is greater than a predetermined low threshold and smaller than a predetermined high threshold.

Invention 4. The signal imbalance compensation device according to Invention 2, wherein the predetermined range is a range in which the Q coordinate on the IQ plane is greater than a predetermined low threshold and smaller than a predetermined high threshold.

Invention 5. The signal imbalance compensation device according to Invention 1, characterized in that the signal imbalance compensation device further includes a signal update control unit, configured to control the update of the signal.

Invention 6. The signal imbalance compensation device according to Invention 5, wherein the signal update control unit includes:

a signal update controller, configured to determine timing for performing signal updates,

A trigger is used to enable the signal imbalance compensator to perform compensation of the input signal only at the timing determined by the signal update controller.

Invention 7. The signal imbalance compensation device according to Invention 1, wherein the signal imbalance detector includes:

The current signal imbalance detector is used to detect the signal imbalance value of the current signal;

The previous signal imbalance output device is used to output the previously detected signal imbalance value of the previous signal;

a selector, when the signal imbalance detection signal generation unit outputs a start signal imbalance detection signal, the selector selects the output of the current signal imbalance detector and provides it to the signal imbalance compensator; when the signal imbalance When the detection signal generation unit outputs the stop signal imbalance detection signal, the selector selects the output of the previous signal imbalance outputter and supplies it to the signal imbalance compensator.

Invention 8. The signal imbalance compensation device according to Invention 1, wherein the signal imbalance detector includes a phase imbalance detector and an amplitude imbalance detector, and the signal imbalance compensator includes a phase imbalance compensator and an amplitude imbalance compensation The signal imbalance detection signal generation unit generates the same start signal imbalance detection signal or the same stop signal imbalance detection signal to control the phase imbalance detector and the amplitude imbalance detector.

Invention 9. The signal imbalance compensation device according to Invention 1, wherein the signal imbalance detector includes a phase imbalance detector and an amplitude imbalance detector, and the signal imbalance compensator includes a phase imbalance compensator and an amplitude imbalance compensation The signal imbalance detection signal generation unit generates different start signal imbalance detection signals or different stop signal imbalance detection signals to control the phase imbalance detector and the amplitude imbalance detector respectively.

Invention 10. The signal imbalance compensation device according to Invention 1, characterized in that, the signal imbalance compensation device further comprises a high-pass filter for filtering the signal input to the signal imbalance detection controller and/or the imbalance detector The signal is filtered.

Invention 11. The signal imbalance compensation device according to Invention 1, wherein the input signal includes two identical input signals, wherein the signal imbalance detector, the judging unit and the signal imbalance detection signal generation The unit works on one of the two identical input signals, and the signal imbalance compensator operates on the other of the two identical input signals according to the signal imbalance detected by the signal imbalance detector. One way input signal for compensation.

Invention 12. A signal imbalance compensation method, characterized in that the signal imbalance compensation method comprises:

a judging step for judging whether the input signal or the imbalance-compensated signal is within a predetermined range;

A signal imbalance detection signal generation step, outputting a start signal imbalance detection signal or a stop signal imbalance detection signal according to the judgment result of the judgment step;

an unbalanced value detecting step of detecting a signal unbalanced value of the input signal;

an imbalance compensation step of compensating the signal imbalance of the input signal based on the previously detected signal imbalance value when the signal imbalance detection signal generation step outputs a stop signal imbalance detection signal, and when the signal imbalance detection signal generation step outputs a start signal When the unbalanced detection signal is used, the signal unbalance of the input signal is compensated according to the currently detected signal unbalanced value.

Invention 13. The signal imbalance compensation method according to Invention 12, characterized in that the method further comprises a branching step of dividing the input signal into two signals, wherein the judging step and the imbalance value detecting step are aimed at It is performed on one of the two signals, and the imbalance compensation step is performed on the other of the two signals.

Invention 14. The signal imbalance compensation method according to Invention 13, characterized in that the method further comprises a high-pass filtering step for performing high-pass filtering on the one-way signal.

Invention 15. A signal imbalance compensation device. The signal imbalance compensation device is input with two identical input signals. The signal imbalance compensation device includes:

The signal imbalance detector (620, 640) is configured to detect a signal imbalance value of one input signal among the two identical input signals;

A signal imbalance compensator (630, 650), configured to compensate the other input signal of the two identical input signals according to the signal imbalance value detected by the signal imbalance detector.

Invention 16. A signal imbalance compensation method. The signal imbalance compensation method processes two identical input signals. The signal imbalance compensation method includes:

A signal imbalance detection step, for detecting a signal imbalance value of one of the two identical input signals;

The signal imbalance compensation step is used to compensate the other input signal of the two identical input signals according to the signal imbalance value detected by the signal imbalance detector.

Compared with the prior art, the phase and amplitude imbalance compensation device and method of the present invention have the advantages of fully considering the short-term non-ideal statistical characteristics of the signal, the dynamic range of the signal, and the effects of nonlinear devices such as digital-to-analog converters on the signal characteristics. Change, by controlling the estimation and compensation of phase and amplitude imbalance, solve the problem of estimation and compensation of phase and amplitude imbalance in the presence of DC components.

Description of drawings

The accompanying drawings illustrate preferred embodiments of the present invention, and constitute a part of the specification, and are used to explain the principle of the present invention in further detail together with the text description. in:

FIG. 1 is a schematic block diagram showing a signal imbalance compensation device according to the prior art;

FIG. 2 shows a typical implementation of a signal imbalance compensation device according to the prior art;

3 is a schematic block diagram showing a signal imbalance compensation device according to the present invention;

4 is an example showing how a signal imbalance detection controller outputs a start/stop imbalance detection signal according to an input I channel signal and a Q channel signal according to the present invention;

Fig. 5 shows a typical implementation of the signal imbalance compensation device according to the present invention;

FIG. 6 shows another typical implementation of the signal imbalance compensation device according to the present invention;

Fig. 7 comparatively shows the phase and amplitude unbalance value under the situation of adopting the present invention and the typical curve under the situation of not adopting the present invention;

FIG. 8 is a schematic block diagram of another signal imbalance compensation device according to the present invention; and

Fig. 9 shows a flowchart of a signal imbalance compensation method according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Fig. 3 shows a schematic block diagram of a quadrature demodulator used in a quadrature receiver according to the invention.

As shown in FIG. 3 , the quadrature demodulator 30 includes an analog part 300 and a digital part 310 .

The analog section 300 includes a signal splitter 301, a first multiplier 302, a second multiplier 303, a local carrier generator 304, a 90° phase shifter 305, a first analog-to-digital converter (ADC) 306, and a second analog-to-digital converter converter 307 .

The signal divider 301 receives the RF/IF signal, and divides the received signal into a first signal part and a second signal part. The first signal part is sent to the first multiplier 302 and the second signal part is sent to the second multiplier 303 . The first multiplier 302 generates an I channel signal by mixing the first signal portion with the carrier signal output from the local carrier generator 304 . The second multiplier 303 generates a Q channel signal by mixing the second signal part with the carrier signal output from the local carrier generator 304 and phase-shifted by 90° by the 90° phase shifter 305 . The first analog-to-digital converter 306 and the second analog-to-digital converter 307 respectively convert the analog I-channel signal and the analog Q-channel signal into digital I-channel signals and digital Q-channel signals, wherein k is a positive integer representing a signal sampling number.

It should be noted that the above description of the simulation part is illustrative and not limiting to the present invention, and those skilled in the art may implement the simulation part in any other manner known in the art.

As shown in Figure 3, the digital part 310 includes a signal imbalance compensation device and other baseband signal processing parts 315, and the signal imbalance compensation device includes a phase imbalance detector 311, an amplitude imbalance detector 313, a phase imbalance compensator 312 and an amplitude imbalance compensator 314 . In addition, the signal imbalance compensation device of the present invention further includes a signal imbalance detection controller 321 .

The signal imbalance detection controller 321 outputs a start imbalance detection signal or a stop imbalance detection signal according to the characteristics of the received I channel signal and Q channel signal.

The working state of the phase imbalance detector 311 is controlled by the signal imbalance detection controller 321 . When the signal imbalance detection controller 321 outputs the start phase imbalance detection signal, the phase imbalance detector 311 receives the digital I channel signal and the digital Q channel signal, and detects the phases of the I and Q channel signals caused by the unsatisfactory characteristics of the analog part unbalance and output the current phase unbalance value to the phase unbalance compensator 312 . The phase imbalance compensator 312 compensates the phase imbalance of the I and Q channel signals according to the current phase imbalance value from the phase imbalance detector 311 . When the signal imbalance detection controller 321 outputs a stop imbalance detection signal, the phase imbalance detector 311 outputs the phase imbalance value at the previous sampling moment to the phase imbalance compensator 312 for compensating the phase imbalance of the I and Q channel signals.

The phase imbalance compensator 312 performs corresponding phase imbalance compensation according to the output of the phase imbalance detector 311 . The compensation method can be sample-by-sample compensation based on the output of the phase imbalance detector 311 , or periodically or aperiodically based on the output of the phase imbalance detector 311 .

Similarly, the working state of the amplitude imbalance detector 313 is controlled by the signal imbalance detection controller 321 . When the signal imbalance detection controller 321 outputs the starting amplitude imbalance detection signal, the amplitude imbalance detector 311 receives the digital I channel signal and the digital Q channel signal, and detects the amplitudes of the I and Q channel signals caused by the unsatisfactory characteristics of the analog part unbalance and output the current amplitude unbalance value to the amplitude compensator 314 . The amplitude compensator 314 compensates the phase imbalance of the I and Q channel signals based on the current phase imbalance value from the phase imbalance detector. When the signal imbalance detection controller 321 outputs a stop imbalance detection signal, the amplitude imbalance detector 313 outputs the phase imbalance value at the previous sampling moment to the amplitude imbalance compensator 314 for compensating the amplitude imbalance of I and Q channel signals.

The amplitude imbalance compensator 314 performs corresponding amplitude imbalance compensation according to the output of the amplitude imbalance detector 313 . The compensation method can be sample-by-sample compensation based on the output of the amplitude imbalance detector 313 , or periodically or non-periodically based on the output of the amplitude imbalance detector 313 .

Other baseband processing parts 315 are well-known technical contents in the art, and are not important to the present invention, so they will not be described in detail here. It should be noted that, although not shown in FIG. 3 , other components, such as amplifiers and filters, may be required for correct receiving operation. Those skilled in the art can make appropriate arrangements for this, so their specific arrangements will not be repeated to make the gist of the present invention more prominent.

In addition, it can be seen from the above description that the biggest difference between the present invention and the prior art lies in the addition of a signal imbalance detection controller 321 . The signal imbalance detection controller 321 will be described in detail below.

In the present invention, the input signal of the signal imbalance detection controller 321 may be a signal before phase compensation and amplitude compensation, or a signal after phase compensation and amplitude compensation.

First, the case where the input signal of the signal imbalance detection controller 321 is a signal before phase compensation and amplitude compensation will be described below. This situation is the situation shown in FIG. 3 .

Fig. 4A shows a schematic structural block diagram of a signal imbalance detection controller according to an embodiment of the present invention.

As shown in FIG. 4A , a signal imbalance detection controller according to an embodiment of the present invention includes a judging unit 401 and a signal generating unit 402 .

In the case of FIG. 3 , the judging unit 401 first judges whether the signals with phase and amplitude imbalance output by the analog-to-digital converters 306 and 307 (hereinafter referred to as input signals) fall within a predetermined range. If the judging unit 401 judges that the input signal falls within a predetermined range (error estimation confidence zone), the signal generating unit 402 generates a starting signal imbalance detection signal, including a starting amplitude imbalance detection signal and a starting phase imbalance detection signal. If the judging unit 401 judges that the input signal does not fall within the predetermined range, the signal generating unit 402 generates a stop signal imbalance detection signal, including a stop amplitude imbalance detection signal and a stop phase imbalance detection signal. Here, the same or different predetermined ranges can be used for controlling the phase and amplitude imbalance.

Fig. 4B, Fig. 4C, Fig. 4D, Fig. 4E show several exemplary limiting patterns for the predetermined range. As shown in the figure, when the I channel signal and the Q channel signal of the input signal imbalance detection controller 321 are located in the shadow area of the IQ plane (ie, the error estimation confidence zone), the output starts the imbalance detection signal, and when the input signal imbalance detection controller 321 When the I channel signal and the Q channel signal are located in other areas, a stop imbalance detection signal is output.

The determination processing of the determination unit 401 for these predetermined ranges will be described below.

The shaded area in Figure 4B can be expressed as:

$<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}\mathrm{<span\; class="notranslate">\; or</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}<span\; class="notranslate">\; )</span>$

The shaded area in Figure 4C is represented as:

${\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; (</span>{\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}<span\; class="notranslate">\; )</span>$

The shaded area in Figure 4D is represented as:

$<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}<span\; class="notranslate">\; )</span>$

The shaded area in Figure 4E is represented as:

$<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}\mathrm{<span\; class="notranslate">\; or</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; <</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; high</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; and</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}\mathrm{<span\; class="notranslate">\; or</span>}<span\; class="notranslate">\; |</span>\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ></span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; \&Greater\; Equal;</span><span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; Th</span>}}_{\mathrm{<span\; class="notranslate">\; low</span>}}<span\; class="notranslate">\; )</span>$

和

分别表示输入信号失衡检测控制器321的I信道信号和Q信道信号，Th_high表示预定大阈值，Th_low。表示预定小阈值，并且：0≤Th_low＜Th_high≤ADCOUT_max，其中ADCOUT_max代表数模转换器的最大输出值。4B, FIG. 4C, FIG. 4D, and FIG. 4E shaded area expressions above,

and

represent the I channel signal and the Q channel signal of the input signal imbalance detection controller 321 respectively, Th _high represents a predetermined large threshold, Th _low . represents a predetermined small threshold, and: 0≤Th _low <Th _{high≤ADCOUT max} , where ADCOUT _max represents the maximum output value of the digital-to-analog converter.

Therefore, according to the input I channel signal and Q channel signal, the judging unit 401 of the signal imbalance detection controller 321 can judge whether the input signal is within a predetermined range.

It should be noted that although the predetermined range is exemplified above, those skilled in the art can obviously conceive different ranges according to the present invention, such as dividing and combining the ranges in Fig. 4B-Fig. 4E, etc., for example Fig. 4F Figure 4B is combined with Figure 4C, Figure 4G is combined with Figure 4D and Figure 4E, etc., but these are all within the scope of the present invention.

Alternatively, the predetermined range may be a range on the IQ plane excluding signal points of I-path or Q-path less than a predetermined small threshold and points greater than a predetermined large threshold. The large threshold and small threshold here can be obtained through simulation or experience.

FIG. 5 shows a specific implementation of a signal imbalance compensation device for compensating a Q channel signal with an I channel signal as a reference signal.

As shown in FIG. 5, a signal imbalance compensation device 50 according to an embodiment of the present invention includes: a signal imbalance detection controller 500, a phase imbalance detector 510, a phase imbalance compensator 520, an amplitude imbalance detector 530, and an amplitude imbalance compensator 540.

Wherein, the signal imbalance detection controller 500 corresponds to the signal imbalance detection controller 321 shown in FIG. 3 , the phase imbalance detector 510 corresponds to the phase imbalance detector 311 shown in FIG. 3 , and the phase imbalance compensator 520 corresponds to the The phase imbalance compensator 312 and the amplitude imbalance detector 530 correspond to the amplitude imbalance detector 313 in FIG. 3 , and the amplitude imbalance compensator 540 corresponds to the amplitude imbalance compensator 314 in FIG. 3 .

和

落在图4D所示的阴影区内输出启动失衡检测信号。需要说明的是，针对相位和幅度失衡检测可以采用相同的控制信号也可以采用不同的控制信号，如果采用相同的控制信号，分为启动失衡检测信号和停止失衡检测信号，如果采用不同的控制信号，分为启动相位失衡检测信号、停止相位失衡检测信号、启动幅度失衡检测信号和停止幅度失衡检测信号。In this specific implementation, the signal imbalance detection controller 500 adopts the control method shown in Figure 4D, when the input signal

and

The start-up imbalance detection signal falls within the hatched area shown in FIG. 4D. It should be noted that the same control signal or different control signals can be used for phase and amplitude unbalance detection. If the same control signal is used, it can be divided into start unbalance detection signal and stop unbalance detection signal. If different control signals are used , divided into start phase unbalance detection signal, stop phase unbalance detection signal, start amplitude unbalance detection signal and stop amplitude unbalance detection signal.

When the signal imbalance detection controller 500 outputs the start phase imbalance detection signal, the selector 514 outputs the phase error e(k) output by the multiplier 512, and the phase imbalance detector 510 at this time is equivalent to a phase imbalance detector in the prior art. When the signal imbalance detection controller 500 outputs the stop phase imbalance detection signal, the selector 514 outputs the constant 0 output by the constant 0 output unit 513 . At this time, the constant 0 output unit 513 , the selector 514 , the adder 515 and the delay holder 516 constitute a previous phase imbalance value output unit, and output the unmodified phase imbalance value (ie, the previous valid phase imbalance value).

The phase imbalance compensator 520 is composed of a multiplier 521 and an adder 522, and compensates the phase imbalance of the Q channel signal based on the I channel signal according to the phase imbalance value output by the phase imbalance detector.

When the signal imbalance detection controller 500 outputs the starting amplitude imbalance detection signal, the selector 536 outputs the output amplitude error d(k) of the multiplier 534, and the amplitude imbalance detector 530 is equivalent to the signal imbalance detection controller of the prior art . When the signal imbalance detection controller 500 outputs the stop amplitude imbalance detection signal, the selector 536 outputs the constant 0 output by the constant 0 generator 535 . At this time, the constant 0 generator 535 , the adder 537 and the delay holder 538 can be regarded as a previous amplitude imbalance value output unit for outputting the previous amplitude imbalance value.

Both or one of the previous phase imbalance value output unit and the previous amplitude imbalance value output unit constitutes the previous signal imbalance value output unit of the present invention.

The amplitude imbalance compensator 540 is composed of a multiplier 541, and compensates the amplitude imbalance of the Q channel signal based on the I channel signal according to the amplitude imbalance value output by the amplitude imbalance detector.

In FIG. 5, μ ₁ (k) and μ ₂ (k) can be constant or variable.

In addition, although it is shown in FIG. 3 and FIG. 5 that the Q channel signal is compensated with the I channel signal as the reference signal, those skilled in the art should realize that the I channel signal can be compensated with the Q channel signal as the reference signal. compensate.

In addition, it should be noted that in FIG. 5, when the selector 514 selects the output of the multiplier 512 according to the output of the signal imbalance detection controller 500 to start the amplitude imbalance detection signal, the working mode of the phase imbalance detector 510 and the prior art is Same. In fact, the present invention has no limitation on the implementation of the phase imbalance detector 510, and other phase imbalance detectors 510 can be used.

Fig. 6 shows another typical implementation of the signal imbalance compensation device according to the present invention. FIG. 6 shows a solution for compensating the I channel signal with the Q channel signal as the reference signal. As shown in Figure 6, the signal imbalance compensation device 60 is composed of 5 parts: a signal imbalance detection controller 610, a phase imbalance detector 620, a phase imbalance compensator 630, an amplitude imbalance detector 640, an amplitude imbalance compensator 650 and an update controller 660, in addition to high-pass filters 601, 602, flip-flops 603, 604.

和

通过高通滤波器601、602后分别输出

和

，该支路信号用于进行相位及幅度失衡估计，高通滤波器601、602用于消除直流分量对相位及幅度失衡估计带来的影响，在DC分量通过其他方案被去除的情况下，可以不使用高通滤波器601、602，此时 ${\tilde{I}}^{\&prime;}=\tilde{I},$ ${\tilde{Q}}^{\&prime;}=\tilde{Q}.$ input signal

and

After passing through high-pass filters 601 and 602, output

and

, the branch signal is used to estimate the phase and amplitude imbalance, and the high-pass filters 601 and 602 are used to eliminate the influence of the DC component on the phase and amplitude imbalance estimation. When the DC component is removed by other schemes, it is not necessary Using high-pass filters 601, 602, at this time ${\tilde{I}}^{\&prime;}=\tilde{I},$ ${\tilde{Q}}^{\&prime;}=\tilde{Q}.$

In FIG. 6, the signal imbalance detection controller 610 adopts the control method shown in FIG. 4E, when the input signal and When it does not fall within the shaded area shown in FIG. 4E , a stop imbalance detection signal is output.

When the signal imbalance detection controller 610 outputs the start phase imbalance detection signal, the selector 624 outputs the phase error e(k) output by the multiplier 622, and when the signal imbalance detection controller 610 outputs the stop phase imbalance detection signal, the selector 624 outputs The constant 0 generated by the constant 0 generator 623; the multiplier 621, the multiplier 622, the selector 624, the adder 625 and the delay holder 626 constitute a phase imbalance detector and output a phase imbalance value . When the signal imbalance detection controller 610 outputs the start imbalance detection signal, $\widehat{\mathrm{\&alpha;}}\left(k\right)=\widehat{\mathrm{\&alpha;}}(k-1)+{\mathrm{\&mu;}}_1\left(k\right)\&times;{\tilde{I}}^{\&prime;}\left(k\right)\&times;{\tilde{Q}}^{\&prime;}\left(k\right);$ When the signal imbalance detection controller 610 outputs the stop imbalance detection signal, $\widehat{\mathrm{\&alpha;}}\left(k\right)=\widehat{\mathrm{\&alpha;}}(k-1).$

。当信号失衡检测控制器610输出启动失衡检测信号， $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1)+{\mathrm{\&mu;}}_2\left(k\right)\&times;\left(\right|{\tilde{I}}^{\&prime;}\left(k\right)|-|{\tilde{Q}}^{\&prime;}\left(k\right)\left|\right);$ 当信号失衡检测控制器610输出停止失衡检测信号时， $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1).$ When the signal imbalance detection controller 610 outputs the start amplitude imbalance detection signal, the selector 646 outputs the output amplitude error d(k) of the multiplier 644, and when the signal imbalance detection controller 610 outputs the stop amplitude imbalance detection signal, the selector 646 outputs Constant 0; when the signal imbalance detection controller 610 outputs the starting amplitude imbalance detection signal, the absolute value generator 641, the absolute value generator 642, the adder 643, the multiplier 644, the selector 646, the adder 647 and the delay holder 648 Constitutes a phase imbalance detector and outputs an amplitude imbalance value

. When the signal imbalance detection controller 610 outputs the start imbalance detection signal, $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1)+{\mathrm{\&mu;}}_2\left(k\right)\&times;\left(\right|{\tilde{I}}^{\&prime;}\left(k\right)|-|{\tilde{Q}}^{\&prime;}\left(k\right)\left|\right);$ When the signal imbalance detection controller 610 outputs the stop imbalance detection signal, $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1).$

幅度失衡值

都会通过触发器603、604更新失衡值

及

，即 $\widehat{\mathrm{\&alpha;}}=\widehat{\mathrm{\&alpha;}}\left(k\right),$ $\widehat{\mathrm{\&gamma;}}=\widehat{\mathrm{\&gamma;}}\left(k\right),$ 此外，也可以周期性地或非周期性地的发出相位更新及幅度更新信号。此时，通过合理设计其更新时间，可以有效克服由于信号短时统计特性不理想带来的估计误差的影响。The compensation parameter update controller 660 sends phase update and amplitude update signals according to control needs. The update signal can be updated all the time for the output, at this time, each output phase imbalance value

Amplitude imbalance

will update the imbalance value through triggers 603 and 604

and

,Right now $\widehat{\mathrm{\&alpha;}}=\widehat{\mathrm{\&alpha;}}\left(k\right),$ $\widehat{\mathrm{\&gamma;}}=\widehat{\mathrm{\&gamma;}}\left(k\right),$ In addition, the phase update and amplitude update signals may also be sent out periodically or aperiodically. At this time, by reasonably designing the update time, the influence of the estimation error caused by the unsatisfactory short-term statistical characteristics of the signal can be effectively overcome.

The phase imbalance compensator 630 is composed of a multiplier 631 and an adder 632, and according to the phase imbalance value The phase imbalance of the I channel signal is compensated based on the Q channel signal.

以Q信道信号为基准补偿I信道信号的幅度失衡。Amplitude unbalance compensator 650 is made up of multiplier 651, according to the amplitude unbalance value

Based on the Q channel signal, the amplitude imbalance of the I channel signal is compensated.

In FIG. 6, μ ₁ (k) and μ ₂ (k) can be constant or variable.

The updating controller 660, flip-flops 604 and 603 in FIG. 6 constitute the unbalance value updating device of the present invention.

In addition, although it is shown in FIG. 6 that the I channel signal is compensated with the Q channel signal as the reference signal, those skilled in the art should realize that the Q channel signal may be compensated with the I channel signal as the reference signal.

It should be noted that comparing the technical solution of Fig. 6 with the technical solution of the present invention shown in Fig. 3 and the technical solution of the prior art shown in Fig. 1 and Fig. 2, the technical solution of Fig. 6 has a prominent feature, That is, the detection of the signal imbalance value (including the phase imbalance value and the amplitude imbalance value) and the compensation of the signal imbalance value (including the phase imbalance value and the amplitude imbalance value) are performed for different input signals. That is, as shown in FIG. 6, the input signal is divided into two input signals (each input signal includes an I signal and a Q signal), and the phase imbalance detection and the amplitude imbalance detection are performed on one of the signals, The compensation for phase imbalance and amplitude imbalance is performed on another signal. This is also an outstanding feature of the present invention.

In the technical solution shown in FIG. 6 , high-pass filtering is performed on one input signal for unbalance detection.

Therefore, the present invention provides a signal imbalance compensation device, the signal imbalance compensation device is input with two identical input signals, the signal imbalance compensation device includes: signal imbalance detectors 620 and 640, used to detect the two identical input signals The signal unbalance value of one of the input signals in the input signal; the signal unbalance compensator 630 and 650 are used for according to the signal unbalance value detected by the signal unbalance detector, for the other of the two same input signals The input signal is compensated.

That is to say, in one solution of the present invention, there may or may not be a signal imbalance detection controller.

Similarly, the present invention provides a signal imbalance compensation method, the signal imbalance compensation method processes two identical input signals, wherein the signal imbalance compensation method includes: a signal imbalance detection step for detecting the The signal unbalance value of one of the two identical input signals; the signal unbalance compensation step is used to correct the other of the two identical input signals according to the signal unbalance value detected by the signal unbalance detector The input signal is compensated.

Those of ordinary skill in the art can clearly know how to implement the above method and device after reading this application in conjunction with FIG. 6 of the present invention.

When the input signal has some characteristics (such as the input signal is very small), most of them are quantized to 0 after passing through the digital-to-analog converters 306 and 307 as shown in Figure 3, and Figure 7 shows that more than 90% of the sample points are quantized to 0 The change curve of the actual value and the estimated value of the phase and amplitude imbalance over time.

Figure 7A shows the phase imbalance estimate and actual value after the phase imbalance is estimated using the conventional method shown in Figure 2, and Figure 7B shows the amplitude imbalance after the amplitude imbalance is estimated using the conventional method shown in Figure 2 Estimated value and actual value; Figure 7C shows the phase imbalance estimated value and actual value after the phase imbalance is estimated by the present invention, and Figure 7D shows the amplitude imbalance estimated value and the actual value after the amplitude imbalance is estimated by the present invention value. From this, the effect of the present invention can be seen.

及

，仍然采用与图3相同的控制方法。FIG. 8 shows a quadrature demodulator in the case where the input of the signal imbalance detection controller 821 is a phase-compensated and amplitude-compensated signal. As shown in Figure 8, when the input of the signal imbalance detection controller 821 is a signal after phase compensation and amplitude compensation, compared with Figure 3, the difference is that the input signal of the signal imbalance detection controller is phase and amplitude compensated After

and

, still using the same control method as in Figure 3.

In addition, it should be noted that, as described above, the previous phase imbalance value output unit and the previous amplitude imbalance value output unit of the present invention can be implemented by simply changing the amplitude imbalance detector and phase imbalance detector of the prior art. But this is just an example, not a limitation of the present invention, and various methods can be used to output the unaltered amplitude imbalance signal and the unaltered phase imbalance signal. For example, another register can be used to save the phase imbalance value in the register 516 and the amplitude imbalance value in the register 538, and then use a switching device to switch between the other register and the register 516 according to the signal of the signal imbalance detection controller , and switching between the additional register and register 538. When the values in the register 516 and the register 538 are output, the values in the other register are updated synchronously, and when the values in the register 516 and the register 538 are not output, the values in the other register are not updated. For another example, a switching device may be used to disconnect or conduct the input of e(k) to the adder 515 according to the signal of the signal imbalance detection controller. In a word, those skilled in the art can think of various methods and devices for outputting the previous phase imbalance value and amplitude imbalance value.

和

不变。Fig. 9 shows a flowchart of a signal imbalance compensation method according to an embodiment of the present invention. As shown in Figure 9, at first in step 901 it is judged whether the input I branch signal and the Q branch signal are within the predetermined range, if within the predetermined range (step 901, yes), then in step 902 the output starts the phase imbalance detect the signal and start the amplitude imbalance detection signal, and update the current phase and amplitude imbalance value in step 904, namely $\widehat{\mathrm{\&alpha;}}\left(k\right)=\widehat{\mathrm{\&alpha;}}(k-1)+{\mathrm{\&mu;}}_1\left(k\right)\&times;{\tilde{I}}^{\&prime;}\left(k\right)\&times;{\tilde{Q}}^{\&prime;}\left(k\right),$ $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1)+{\mathrm{\&mu;}}_2\left(k\right)\&times;\left(\right|{\tilde{I}}^{\&prime;}\left(k\right)|-|{\tilde{Q}}^{\&prime;}\left(k\right)\left|\right).$ If the input I-branch signal and Q-branch signal are not within the predetermined range (step 901, No), then output stop phase unbalance detection signal and stop amplitude unbalance detection signal in step 903, and output the original phase in step 905 and amplitude imbalance value, namely $\widehat{\mathrm{\&alpha;}}\left(k\right)=\widehat{\mathrm{\&alpha;}}(k-1),$ $\widehat{\mathrm{\&gamma;}}\left(k\right)=\widehat{\mathrm{\&gamma;}}(k-1).$ Here, the control of the phase and amplitude detection can adopt the same control condition or can adopt different control conditions respectively. Afterwards, in step 906, it is judged whether it is time to compensate the phase and amplitude imbalance value, and if so, in step 907, the current phase/amplitude imbalance value is updated to the compensation imbalance value, that is, using $\widehat{\mathrm{\&alpha;}}=\widehat{\mathrm{\&alpha;}}\left(k\right),$ $\widehat{\mathrm{\&gamma;}}=\widehat{\mathrm{\&gamma;}}\left(k\right).$ If not, continue to hold when using phase and amplitude imbalance values

and

constant.

In addition, it should be noted that in the above embodiments of the present invention, the compensation device and method of the present invention are used for both phase and amplitude, but the present invention can only be applied to phase compensation or only to amplitude compensation.

The signal imbalance detector of the present invention includes both or one of the phase imbalance detector and the amplitude imbalance detector. The signal compensator of the present invention includes both or one of the phase unbalance compensator and the amplitude unbalance compensator. Correspondingly, the signal imbalance detection controller of the present invention can be divided into a phase imbalance detection controller that only controls phase imbalance detection and an amplitude imbalance detection controller that only controls amplitude imbalance detection. That is, the signal imbalance detection controller of the present invention includes both or one of the phase imbalance detection controller and the amplitude imbalance detection controller.

According to the above-described embodiments of the present invention, performance degradation due to a phase and/or amplitude imbalance between an I-channel signal and a Q-channel signal due to a defective quadrature demodulator can be prevented.

It should be noted that the scope of the present invention also includes a computer program for executing the above phase and amplitude compensation method and a computer-readable recording medium recorded with the program. As the recording medium, a computer-readable flexible disk, hard disk, semiconductor memory, CD-ROM, DVD, magneto-optical disk (MO), and other media can be used here.

Although only the preferred embodiments have been chosen to illustrate the present invention, those skilled in the art can easily make various changes and modifications based on the disclosure herein without departing from the scope of the invention defined by the appended claims. The descriptions of the above embodiments are illustrative only, and do not constitute limitations on the invention defined by the appended claims and their equivalents.

Claims (10)

1. A signal imbalance compensation device, the signal imbalance compensation device comprising: A signal imbalance detector (311, 313), configured to detect a signal imbalance value of an input signal; A signal imbalance compensator (312, 314), configured to compensate the signal imbalance of the input signal according to the signal imbalance value detected by the signal imbalance detector; A judging unit (401), configured to judge whether the input signal or the compensated signal compensated by the signal imbalance compensator is within a predetermined range; A signal imbalance detection signal generation unit (402), outputting a start signal imbalance detection signal or a stop signal imbalance detection signal according to the judgment result of the judgment unit; When the signal imbalance detection signal generation unit outputs a stop signal imbalance detection signal, the signal imbalance detector (311, 313) outputs a previously detected signal imbalance value of the input signal. 2. The signal imbalance compensation device according to claim 1, wherein the judging unit judges the input signal or the compensated signal by judging the position of the input signal or the compensated signal on the IQ plane. Whether the compensation signal is within a predetermined range, the predetermined range refers to an error estimation confidence zone. 3. The signal imbalance compensation device according to claim 1, characterized in that, the signal imbalance compensation device further comprises a signal update control unit, configured to control the update of the signal. 4. The signal imbalance compensation device according to claim 3, wherein the signal update control unit comprises: a signal update controller (660), configured to determine the timing for signal update, A trigger (603, 604), configured to enable the signal imbalance compensator to perform compensation of the input signal only at the timing determined by the signal update controller. 5. The signal imbalance compensation device according to claim 1, characterized in that, the signal imbalance detector (311, 313) comprises: The current signal imbalance detector is used to detect the signal imbalance value of the current signal; The previous signal imbalance output device is used to output the previously detected signal imbalance value of the input signal; a selector, when the signal imbalance detection signal generation unit outputs a start signal imbalance detection signal, the selector selects the output of the current signal imbalance detector and provides it to the signal imbalance compensator; when the signal imbalance When the detection signal generation unit outputs the stop signal imbalance detection signal, the selector selects the output of the previous signal imbalance outputter and supplies it to the signal imbalance compensator. 6. The signal imbalance compensation device according to claim 1, wherein the signal imbalance detector includes a phase imbalance detector and an amplitude imbalance detector, and the signal imbalance compensator includes a phase imbalance compensator and an amplitude imbalance compensation The signal imbalance detection signal generation unit generates different start signal imbalance detection signals or different stop signal imbalance detection signals to control the phase imbalance detector and the amplitude imbalance detector respectively. 7. A signal imbalance compensation method, characterized in that the signal imbalance compensation method comprises: a judging step for judging whether the input signal or the imbalance-compensated signal is within a predetermined range; A signal imbalance detection signal generation step, outputting a start signal imbalance detection signal or a stop signal imbalance detection signal according to the judgment result of the judgment step; an unbalanced value detecting step of detecting a signal unbalanced value of the input signal; an imbalance compensation step of compensating the signal imbalance of the input signal based on the previously detected signal imbalance value when the signal imbalance detection signal generation step outputs a stop signal imbalance detection signal, and when the signal imbalance detection signal generation step outputs a start signal When the unbalanced detection signal is used, the signal unbalance of the input signal is compensated according to the currently detected signal unbalanced value. 8. The signal imbalance compensation method according to claim 7, characterized in that, the method further comprises a branching step of dividing the input signal into two signals, wherein the judging step and the imbalance value detecting step are aimed at It is performed on one of the two signals, and the imbalance compensation step is performed on the other of the two signals. 9. The signal imbalance compensation method according to claim 8, characterized in that the method further comprises a high-pass filtering step for performing high-pass filtering on the one-way signal. 10. A signal imbalance compensation device, the signal imbalance compensation device is input with two identical input signals, the signal imbalance compensation device includes: The signal imbalance detector (620, 640) is configured to detect a signal imbalance value of one input signal among the two identical input signals; A signal imbalance compensator (630, 650), configured to compensate the other input signal of the two identical input signals according to the signal imbalance value detected by the signal imbalance detector.

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