CN106302272A - Sampling phase difference compensation device, sampling phase difference compensation method and communication device capable of compensating sampling phase difference - Google Patents

Abstract

The invention discloses a compensation device for sampling phase difference, which comprises a signal generator, a signal analyzer and a compensator. The signal generator is used for outputting a first signal to a first path in a first time interval and outputting a second signal to a second path in a second time interval, wherein the first time interval is different from the second time interval, and the first path is different from the second path. The signal analyzer is configured to receive a transmitted first signal from the first path and a transmitted second signal from the second path, and perform a predetermined operation on the transmitted first and second signals, thereby determining a phase difference relationship between the transmitted first and second signals, wherein the phase difference relationship relates to a frequency-dependent phase difference and a sampling phase difference, the transmitted first signal is related to the first signal, and the transmitted second signal is related to the second signal. The compensator is used for performing phase difference compensation according to the phase difference relation.

Description

Compensation device for sampling phase difference, compensation method for sampling phase difference, and communication capable of compensating sampling phase difference device

technical field

The present invention relates to the compensation of phase difference, especially the compensation of sampling phase difference.

Background technique

Communication technologies using in-phase and quadrature-phase modulation (such as Orthogonal Frequency Division Multiplexing (OFDM) communication technology) usually encounter in-phase and quadrature-phase mismatch (IQmismatch or IQ imbalance), this problem has a great impact on circuits using zero intermediate frequency (ZIF) architecture. In order to solve the problem of in-phase and quadrature phase mismatch, the current technology will Frequency-independent mismatches are detected and compensated for separately, where frequency-dependent mismatches are caused by low-pass filters in the in-phase signal path and low-pass filters in the quadrature-phase signal path, and The frequency-independent mismatch is caused by the modulator in the in-phase signal path and the modulator in the quadrature-phase signal path. If the image rejection ratio (IRR) is used to reflect the compensation result, the current technology can obtain an image rejection ratio curve that changes linearly with frequency as shown in FIG. 1 . The definition of the above-mentioned image rejection ratio belongs to common knowledge in the art. It can be found from the image frequency rejection ratio curve in Fig. 1 that the current technology still has some unsatisfactory aspects.

Contents of the invention

In view of the shortcomings of the prior art, an object of the present invention is to provide a sampling phase difference compensating device, a sampling phase difference compensation method and a communication device capable of compensating the sampling phase difference, so as to improve the prior art.

The invention discloses a compensation device for sampling phase difference. One embodiment thereof includes a signal generator, a signal analyzer and a compensator. The signal generator is used to output a first signal to a first path within a first time interval, and is used to output a second signal to a second path within a second time interval, wherein the first and The second time intervals are different, and the first and second paths are different. The signal analyzer is used to receive a transmitted first signal from the first path and a transmitted second signal from the second path, and perform a predetermined operation on the transmitted first and second signals, thereby determining a phase difference relationship between the transmitted first and second signals, wherein the phase difference relationship is associated with a frequency-dependent phase difference and a sampling phase difference, the transmitted first signal being related to the first signal, and The transmitted second signal is related to the second signal. The compensator is used to perform phase difference compensation according to the phase difference relationship.

The present invention also discloses a compensation method for sampling phase difference, one embodiment of which includes the following steps: outputting a first signal to a first path within a first time interval; outputting a second signal within a second time interval signal to a second path, wherein the first and second time intervals are different, and the first and second paths are different; after receiving a transmission from the first path within the first and second time intervals, respectively, the The first signal and a transmitted second signal from the second path, and a predetermined operation is applied to the transmitted first and second signals, thereby measuring the distance between the transmitted first and second signals a phase difference relationship, wherein the phase difference relationship associates a frequency-dependent phase difference and a sampling phase difference, the transmitted first signal is related to the first signal, and the transmitted second signal is related to the second signal; and according to This phase difference relationship performs phase difference compensation.

The present invention also discloses a communication device capable of compensating the sampling phase difference. One embodiment thereof includes: a signal generator, used to output a first signal in a first time interval, and used to output a first signal in a second time interval output a second signal within the first and second time intervals, wherein the first and second time intervals are different; a first digital-to-analog converter, coupled to the signal generator, is used to perform digital-to-analog conversion on the first signal to generate a Analog first signal; a first transmission filter, coupled to the first digital-to-analog converter, used to filter the analog first signal to generate a filtered first signal; a second digital-to-analog converter, coupled Connected to the signal generator, used to perform digital-to-analog conversion on the second signal to generate an analog second signal; a second transmission filter, coupled to the second digital-to-analog converter, used to filter the analog The second signal is used to generate a filtered second signal; a multiplexer is coupled to the first and second transmission filters and is used to output the filtered first and second signals; a first receiving filter is coupled to The multiplexer is used to filter the filtered first signal to generate a re-filtered first signal and the filtered second signal to generate a re-filtered first signal; a first analog-to-digital converter is coupled to the first receiving filter a device for performing analog-to-digital conversion on the re-filtered first signal to generate a transmitted first signal, and performing analog-to-digital conversion on the re-filtered second signal to generate a transmitted second signal; and a receiving A terminal digital front-end circuit, comprising: a signal analyzer, coupled to the first analog-to-digital converter, for applying a predetermined operation to the transmitted first and second signals, thereby measuring the transmitted first and second signals A phase difference relationship between the second signals, wherein the phase difference relationship is associated with a frequency-dependent phase difference and a sampling phase difference; and a compensator for performing phase difference compensation according to the phase difference relationship.

Regarding the characteristics, implementation and effects of the present invention, preferred embodiments are described in detail below in conjunction with the drawings.

Description of drawings

FIG. 1 is a schematic diagram of an image rejection ratio curve in the prior art;

Fig. 2a is a schematic diagram of an embodiment of the compensation device for sampling phase difference of the present invention;

FIG. 2b is a schematic diagram of a circuit that can be applied to FIG. 2a to normally transmit signals;

FIG. 3 is a schematic diagram of an embodiment of the first path and the second path of FIG. 2a;

Figure 4 is a schematic diagram of an embodiment of the signal analyzer of Figure 2a;

FIG. 5 is a schematic diagram of the phase difference before and after performing phase compensation according to the present invention.

Fig. 6 is a schematic diagram of the image frequency suppression ratio curve under the present invention;

FIG. 7 is a schematic diagram of an embodiment of a method for compensating a sampling phase difference of the present invention; and

FIG. 8 is a schematic diagram of an embodiment of a communication device capable of compensating a sampling phase difference of the present invention.

Symbol Description

200 sampling phase difference compensation device

210. SG signal generator

212 First Path

214 Second Path

220. SA Signal Analyzer

230, Comp compensator

20 circuits

250. TX_BB signal supply circuit

262 The first transmission path

264 First receiving path

266. PA output

272 Second Teleportation Path

274 Second receive path

276. LNA input terminal

280. RX_BB signal processing circuit

320, DAC1 first digital to analog converter

330. TX LPF1 first transmit filter

340: Mux multiplexer

350, DAC2 second digital to analog converter

360. TX LPF2 second transmit filter 360

370. RX LPF1 first receiving filter

380, ADC1 first analog to digital converter

410. FFT fast Fourier transform unit

420. PAC phase angle calculation unit

430. PRE phase jump estimation unit

θ(k) _before compensation curve of the total value of the phase difference

l(k) _before compensation The approximate straight line of the change curve of the sum of phase differences before compensation

θ(k) _After compensation, the change curve of the total value of the phase difference

S710～S740 steps

800 Communication device that can compensate for sampling phase difference

810, SG signal generator

832, DAC1 first digital to analog converter

834. TX LPF1 first transmit filter

842, DAC2 Second digital-to-analog converter

844, TX LPF2 Second transmit filter

850, Mux multiplexer

862. RX LPF1 first receiving filter

864, ADC1 first analog to digital converter

872. RX LPF2 second receive filter

874, ADC2 Second analog to digital converter

880, RX DFE receiver digital front-end circuit

882: SA Signal Analyzer

884, Comp compensator

detailed description

The terminology in the following explanations refers to the customary terms in this technical field. If some terms are explained or defined in this specification, the explanation of these terms shall be based on the description or definition in this specification.

The disclosure content of the present invention includes devices and methods, and some components of the device may be known components individually. On the premise of not affecting the full disclosure and practicability of the device, the details of individual known components will be described in the following description Abbreviated; individual steps or a combination of multiple steps of the method may be in the form of software and/or firmware, and may be executed by the device of the present invention or its equivalent device.

When compensating for the frequency-dependent mismatch of the internal components of the transceiver of the communication device, the in-phase and quadrature-phase signals used for the compensation test are transmitted and detected through respective paths at different times to simplify the compensation process. The inventors of this case found through observation that there may be sampling phase difference (or sampling offset, sampling delay) in detection operations at different times, which will affect the compensation effect. To solve this problem, the present invention proposes linear compensation to eliminate the time difference. Compensation device and method for phase influence.

Please refer to FIG. 2a and FIG. 2b. FIG. 2a is a schematic diagram of an embodiment of a sampling phase difference compensating device of the present invention, and FIG. 2b is a schematic diagram of a circuit structure for normally transmitting and receiving signals. As shown in Figure 2a, the compensation device 200 for sampling phase difference includes: a signal generator (marked as SG in the figure) 210, used to output a first signal to a first path 212 and output a second signal to a first path Two paths 214; a signal analyzer (marked as SA in the figure) 220; and a compensator (marked as Comp in the figure) 230. The circuit 20 of FIG. 2b includes a signal supply circuit (such as a baseband circuit at the transmitting end) (marked as TX_BB in the figure) 250, a first transmission path 262 and a first reception path 264, and an output terminal 266 (such as an adder and combination of a power amplifier), a second transmission path 272 and a second reception path 274, an input end 276 (such as a low noise amplifier), and a signal processing circuit (such as a receiving end baseband circuit) (marked as RX_BB in the figure ) 280, wherein the first and second transmission paths 262, 272 are similar in structure and each include digital-to-analog converters, filters, modulation circuits, etc., and the first and second reception paths 264, 274 are similar in structure and each include modulation circuits, filters, analog-to-digital converters, and more. When transmitting and receiving signals normally, the circuit of FIG. 2b does not include or includes but does not need to use a test signal generator (such as the signal generator 210 of FIG. 2a ), a test signal transmission multiplexer (such as the multiplexer of FIG. 3 340), a test signal analyzer (such as the signal analyzer 220 in FIG. 2a), and a test signal compensator (such as the compensator 230 in FIG. 2a). As for the circuit in FIG. 2a, if it wants to transmit and receive signals normally as in FIG. 2b, it will include all the circuits in FIG. 2b, and the first path 212 in FIG. 2a includes the first transmission path 262 and the first reception path 264 in FIG. 2b. , the second path 214 in FIG. 2a includes the second transmission path 272 and the first reception path 264 in FIG. 2b.

Please refer to FIG. 2a again, the signal generator 210 is used to output the first signal to the first path 212 within a first time interval, and to output the second signal to the second path 214 within a second time interval. , the first and second time intervals are different to simplify the phase compensation mechanism, and the first path 212 and the second path 214 are different. For example, the first and second signals are in-phase signals respectively with quadrature-phase signals The initial phase difference between the two is 90 degrees, wherein t is a time point, ω _i is a frequency, N is a positive integer and the value of i can be controlled by the signal generator 210 (that is, the signal generator 210 can control the first and second signals frequency); the first and second time intervals are completely non-overlapping intervals; the first path 212 includes the first transmission path and the first reception path and the second path 214 includes the second transmission path and the first reception path, or the second path 214 includes the second transmission path and the first reception path. A path 212 has the same transmit path as the second path but a different receive path. The signal analyzer 220 is used to receive a transmitted first signal from the first path 212 and a transmitted second signal from the second path 214, and apply a predetermined value to the transmitted first and second signals. operation, whereby a phase difference relationship between the transmitted first and second signals is determined, the phase difference relationship is associated with a frequency-dependent phase difference and a sampling phase difference, the transmitted first signal is related to the first signal, And the transmitted second signal is related to the second signal. The compensator 230 is used to perform phase difference compensation according to the phase difference relationship, for example, to reduce the influence of the sampling phase difference.

FIG. 3 is a schematic diagram of an embodiment of the first path 212 and the second path 214 of FIG. 2a. As shown in FIG. 2 and FIG. 3 , the signal generator 210 is coupled to a first path 212 and a second path 214, the first path 212 includes a first transmission path and a first reception path, and the second path 214 includes a second transmission path with the first receive path. The first transmit path includes a first digital-to-analog converter (marked as DAC1 in the figure) 320, a first transmit filter (marked as TX LPF1 in the figure) 330, and a multiplexer (marked as Mux in the figure) ) 340; the second transmission path includes a second digital-to-analog converter (marked as DAC2 in the figure) 350, a second transmit filter (marked as TX LPF2 in the figure) 360 and the multiplexer 340; The first receive path includes a first receive filter (marked as RX LPF1 in the figure) 370 and a first analog-to-digital converter (marked as ADC1 in the figure) 380 . Each of the above-mentioned elements 320 to 380 may be a known element individually, wherein the first transfer filter 330 and the second transfer filter 360 are the main causes of the aforementioned frequency-dependent phase difference; and the aforementioned first and second signals The difference in transmission time is the main cause of the aforementioned sampling phase difference.

Please refer to Figure 2a and Figure 3, when the first and second signals are respectively and Then, after the first signal is transmitted through the first path 212 (that is, the transmitted first signal r _TXI [n] output by the first analog-to-digital converter 380 ) can be expressed by the following formula 1:

$r_{TxI}\[\mathrm{no}\]=\underset{i=1}{\overset{N/2-1}{\Σ}}{g}_{RxI}\left({\mathrm{\ω}}_i\right)g_{TxI}\left({\mathrm{\ω}}_i\right)\cos (2\mathrm{\π}\mathrm{no}i/N+{\mathrm{\θ}}_{TxI}\left({\mathrm{\ω}}_i\right)+{\mathrm{\θ}}_{RxI}\left({\mathrm{\ω}}_i\right))$ (Formula 1)

where n corresponds to the sampling point of the first analog-to-digital converter 380, g _RXI (ω _i ) is the gain of the first receive path, g _TXI (ω _i ) is the gain of the first transmit path, and θ _TXI (ω _i ) is The phase of the first transmission path and θ _RXI (ω _i ) are the phases of the first reception path, and the definitions of other parameters are as mentioned above.

On the other hand, without considering the sampling phase difference between the first and second signals, after the second signal is transmitted through the second path 214 (that is, the transmitted second signal output by the first analog-to-digital converter 380 r _TXQ [n]) can be represented by the following formula 2:

$r_{TxQ}\[\mathrm{no}\]=\underset{i=1}{\overset{N/2-1}{\Σ}}{g}_{RxI}\left({\mathrm{\ω}}_i\right)g_{TxQ}\left({\mathrm{\ω}}_i\right)\mathrm{the\; s}i\mathrm{no}(2\mathrm{\π}\mathrm{no}i/N+{\mathrm{\θ}}_{TxQ}\left({\mathrm{\ω}}_i\right)+{\mathrm{\θ}}_{RxI}\left({\mathrm{\ω}}_i\right))$ (Formula 2)

Where g _TXQ (w _i ) is the gain of the second transmission path and θ _TXQ ( _wi ) is the phase of the second transmission path, and the definitions of other parameters are as above.

However, since the first and second signals are transmitted at different time points, it is inevitable that there will be a sampling phase difference, so actually the second signal should be r _TXQ [nn _d ] after being transmitted through the second path 214, where n _d represents Unknown sampling phase difference.

FIG. 4 is a schematic diagram of an embodiment of the signal analyzer 220 of FIG. 2a. As shown in Figure 4, the signal analyzer 220 includes: a fast Fourier transform unit (marked as FFT in the figure) 410; a phase angle calculation unit (marked as PAC in the figure) 420, such as a division unit and an arctangent ( Arctangent) calculation unit; and a phase jump (phase ramp) estimation unit (marked as PRE in the figure) 430, such as a phase change rate calculation unit, any one of which can be a known element individually. The fast Fourier transform operation unit 410 is used to convert the first signal r _TXI [n] output by the first analog-to-digital converter 380 from a time-domain signal to a frequency-domain signal R _TXI [k], as shown in the following equation 3 :

$R_{TxI}\[k\]=\frac{N}{2}{g}_{RxI}\left({\mathrm{\ω}}_k\right)g_{TxI}\left({\mathrm{\ω}}_k\right)e^{j({\mathrm{\θ}}_{TxI}\left({\mathrm{\ω}}_k\right)+{\mathrm{\θ}}_{RxI}\left({\mathrm{\ω}}_k\right))}$ (Formula 3)

Where 1≦k≦N/2-1.

The fast Fourier transform operation unit 410 is also used to convert the second signal r _TXQ [nn _d ] output by the first analog-to-digital converter 380 from a time-domain signal to a frequency-domain signal R _TXQ [k], as shown in Equation 4 below Show:

$R_{TxQ}\[k\]=\frac{N}{2j}{g}_{RxI}\left({\mathrm{\ω}}_k\right)g_{TxQ}\left({\mathrm{\ω}}_k\right)e^{j({\mathrm{\θ}}_{TxQ}\left({\mathrm{\ω}}_k\right)+{\mathrm{\θ}}_{RxI}\left({\mathrm{\ω}}_k\right))}{e}^{-j2\mathrm{\π}{\mathrm{no}}_{d}k/N)}$ (Formula 4)

Where 1≦k≦N/2-1.

With R _TXI [k] and R _TXQ [k], the phase angle calculation unit 420 can divide R _TXI [k] by R _TXQ [k] to obtain the mismatch response of the first path 212 and the second path 214 As shown in Formula 5 below:

$\begin{array}{c}\frac{R_{TxI}\[k\]}{R_{TxQ}\[k\]}=\frac{g_{TxI}\left({\mathrm{\ω}}_k\right)}{j\·g_{TxQ}\left({\mathrm{\ω}}_k\right)}{e}^{j({\mathrm{\θ}}_{TxI}\left({\mathrm{\ω}}_k\right)-{\mathrm{\θ}}_{TxQ}\left({\mathrm{\ω}}_k\right))}{e}^{j2{\mathrm{\πn}}_{d}k/N}\\ =g_{Txf\mathrm{D.}}\left({\mathrm{\ω}}_k\right)\·e^{j({\mathrm{\θ}}_{Txf\mathrm{D.}}\left({\mathrm{\ω}}_k\right)+2{\mathrm{\πn}}_{d}k/N)}\end{array}$ (Formula 5)

Wherein θ _TXFD (ω _k ) is the aforementioned frequency-dependent phase difference, and 2πn _d k/N is the aforementioned sampling phase difference; then the phase angle calculation unit 420 can perform an arctangent operation to obtain the sum of the phase differences θ(k)=θ _TXFD (ω _k )+2πn _d k/N.

As mentioned above, if the value of k changes with the value of i controlled by the signal generator 210 (for example, the value of k is an integer between 1 and N/2-1), the phase jump estimation unit 430 can estimate θ _TXFD (ω _k ) and the rate of change Δθ corresponding to multiple sum values θ(k) of 2πn _d k/N, for example, the phase jump estimation unit 430 can use the least square method to calculate the multiple sums The value θ(k) obtains an approximate straight line, and the slope of the straight line is obtained as the rate of change Δθ. In other words, the sum value θ(k) of the frequency-dependent phase difference and the sampled phase difference changes linearly with frequency.

After the signal analyzer 220 finds the rate of change Δθ corresponding to the sum of the frequency-dependent phase difference and the sampling phase difference θ(k), the compensator 230 can compensate the sampling phase difference according to the rate of change Δθ, for example For example, when the analysis result of the signal analyzer 220 shows that "when the k value increases by 1, the sum value θ(k) increases by Δθ; and when k=0, the sum value θ(k)=0", the compensator 230 The sum of the frequency-dependent phase difference and the sampling phase difference θ(k) can be subtracted from k△θ to realize sampling phase difference compensation. The comparison before and after compensation is shown in Figure 5, where the vertical axis is the frequency-dependent phase difference and The sum of the sampled phase differences θ(k), the horizontal axis is k, the change curve θ(k) _before represents the sum of the phase differences before compensation, and the dotted line l(k) _before represents the change curve θ(k) _before the compensation The curve θ(k) _after represents the sum of phase differences after compensation. It can be seen from Figure 5 that the curve θ(k) _after of the sum of phase differences after compensation changes along the horizontal axis and approaches at 0. The frequency-dependent phase difference can be additionally compensated by a digital front-end circuit included in the signal generator, which is well known in the art. If the image rejection ratio (image rejection ratio, IRR) is used to reflect the compensation result after the compensator 230 compensates the sampling phase difference and the digital front-end circuit compensates the frequency-dependent phase difference, the image frequency as shown in FIG. 6 can be obtained The characteristic of the rejection ratio curve is much better than the image frequency rejection ratio curve in the prior art shown in FIG. 1 .

In addition to the above-mentioned device, the present invention also discloses a compensation method for sampling phase difference. As shown in Figure 7, an embodiment of the compensation method comprises the following steps:

Step S710: Output a first signal to a first path within a first time interval. This step can be performed by the combination of the signal generator 210 and the first path 212 in FIG. 2a or its equivalent circuit, and relevant details and changes can be obtained directly or inferred from the foregoing description.

Step S720: Outputting a second signal to a second path within a second time interval, wherein the first and second time intervals are different, and the first and second paths are different. This step can be performed by the combination of the signal generator 210 and the second path 214 in FIG. 2a or its equivalent circuit, and relevant details and changes can be obtained directly or inferred from the foregoing description.

Step S730: Receive a post-transmission first signal from the first path and a post-transmission second signal from the second path within the first and second time intervals respectively, and transmit the first and second post-transmission signals The two signals are subjected to a predetermined operation, thereby determining a frequency-dependent phase difference and a sampling phase difference between the transmitted first and second signals. This step can be performed by the signal analyzer 220 in FIG. 2 a or its equivalent circuit, and relevant details and changes can be obtained directly or inferred from the foregoing description.

Step S740: Perform the sampling phase difference compensation according to the sum of the frequency-dependent phase difference and the sampling phase difference. This step can be performed by the compensator 230 in FIG. 2 a or its equivalent circuit, and relevant details and changes can be obtained directly or inferred from the foregoing description.

Because those skilled in the art can deduce the implementation details and changes of this method embodiment from the disclosure content of the device embodiment disclosed above, more specifically, the technical features of the device embodiment can be reasonably applied to the implementation of this method In the example, therefore, on the premise of not affecting the disclosure requirements and practicability of the method embodiment, repeated and redundant descriptions are omitted here.

In addition to the above-mentioned device and method, the present invention also discloses a communication device capable of compensating the sampling phase difference, an embodiment of which is shown in FIG. 8 . Please refer to FIG. 8, the communication device 800 includes: a signal generator (marked as SG in the figure) 810; a first digital-to-analog converter (marked as DAC1 in the figure) 832; a first transmission filter (marked as DAC1 in the figure) 832; is TX LPF1) 834; a second digital-to-analog converter (marked as DAC2 in the figure) 842; a second transmit filter (marked as TX LPF2 in the figure) 844; a multiplexer (marked as Mux in the figure) 850; a first receive filter (marked as RX LPF1 in the figure) 862; a first analog-to-digital converter (marked as ADC1 in the figure) 864; a second receive filter (marked as RX LPF2 in the figure) 872 ; a second analog-to-digital converter (marked as ADC2 in the figure) 874; and a receiving end digital front-end circuit (marked as RX DFE in the figure) 880, which includes a signal analyzer (marked as SA in the figure) 882 and A compensator (labeled Comp) 884 in the figure. The signal generator 810 is used to output a first signal to a first path within a first time interval, and to output a second signal to a second path within a second time interval, wherein the first Different from the second time interval, and different from the first and second paths. The first digital-to-analog converter 832 is coupled to the signal generator 810 for performing digital-to-analog conversion on the first signal to generate an analog first signal. The first pass filter 834 is coupled to the first digital-to-analog converter 832 for filtering the analog first signal to generate a filtered first signal. The second digital-to-analog converter 842 is coupled to the signal generator 810 for performing digital-to-analog conversion on the second signal to generate an analog second signal. The second pass filter 844 is coupled to the second digital-to-analog converter 842 for filtering the analog second signal to generate a filtered second signal. The multiplexer 850 is coupled to the first transmission filter 834 and the second transmission filter 844 for outputting the filtered first and second signals, and the time intervals for outputting the filtered first and second signals are different. The first receiving filter 862 is coupled to the multiplexer 850, and is used to filter the filtered first signal to generate a re-filtered first signal, and filter the filtered second signal in the second time interval to generate a re-filtered signal second signal. The first analog-to-digital converter 864 is coupled to the first receive filter 862 for performing analog-to-digital conversion on the re-filtered first signal to generate a transmitted first signal, and to the re-filtered second signal Analog-to-digital conversion is performed to generate a transmitted second signal. The second receiving filter 872 and the second analog-to-digital converter 874 have nothing to do with the inventive features in this embodiment; the signal analyzer 882 is coupled to the first analog-to-digital converter 864 for transmitting The first and second signals are subjected to a predetermined operation, thereby determining a frequency-dependent phase difference and a sampling phase difference between the transmitted first and second signals. The compensator 884 is used to perform the sampling phase difference compensation according to the frequency-dependent phase difference and the sampling phase difference.

To sum up, the device and method of the present invention can compensate the frequency-dependent phase difference and the sampling phase difference, and can achieve a better mismatch compensation effect than the prior art.

Claims (19)

1. a compensation device for sampling phase difference, comprises:

One signal generator, for output one first signal in a very first time interval to a first path, And be used in one second time interval, exporting a secondary signal to one second path, wherein this first and the Two time intervals are different, and this first and second path is different；

One signal analyzer, is used for receiving the first signal and from this after a transmission of this first path Secondary signal after one transmission in the second path, and first and second signal after this transmission is imposed a predetermined fortune Calculate, thereby measure the phase contrast relation between first and second signal, wherein this phase contrast relation after this transmission Associating a frequency dependent phase contrast and a sampling phase is poor, after this transmission, the first signal correction is in this first letter Number, and after this transmission, secondary signal is relevant to this secondary signal；And

One compensator, is used for performing this sampling phase difference according to this phase contrast relation and compensates.

2. the compensation device of sampling phase difference as claimed in claim 1, it is characterised in that this first via Footpath comprises one first transmission path and one first RX path, and this second path comprises one second transmission path Footpath and this first RX path.

3. the compensation device of sampling phase difference as claimed in claim 2, it is characterised in that this first biography Sending path to comprise one first digital to analog converter, one first transmit wave filter and a multiplexer, this is the years old Two transmit path comprises one second digital to analog converter, one second transmission wave filter and this multiplexer, This first RX path comprises one first receiving filter and one first analog-to-digital converter.

4. the compensation device of sampling phase difference as claimed in claim 1, it is characterised in that this phase contrast Relation is that this frequency dependent phase contrast summation with this sampling phase difference is along with the variation relation of frequency.

5. the compensation device of sampling phase difference as claimed in claim 4, it is characterised in that this signal produces Raw device can control the frequency of this first and second signal, and this compensator is used for compensating according to this variation relation This sampling phase is poor.

6. the compensation device of sampling phase difference as claimed in claim 4, it is characterised in that this change is closed System is in a class linear change.

7. the compensation device of sampling phase difference as claimed in claim 1, it is characterised in that this predetermined fortune Calculation comprises quick Fourier transformation computation, phase angle calculates and phase step estimates at least one computing.

8. a compensation method for sampling phase difference, comprises the steps of

One first signal is exported to a first path in a very first time interval；

In one second time interval, export a secondary signal to one second path, wherein this first and second time Between interval different, and this first and second path is different；

Receive the first signal and the transmission from this second path after a transmission of this first path Rear secondary signal, and first and second signal after this transmission is imposed a predetermined operation, thereby measure this transmission Phase contrast relation between first and second signal rear, wherein this phase contrast relationship one frequency dependent phase place Difference is poor with a sampling phase, and after this transmission, the first signal correction is after this first signal, and this transmission second Signal correction is in this secondary signal；And

Perform this sampling phase difference according to this phase contrast relation to compensate.

9. the compensation method of sampling phase difference as claimed in claim 8, it is characterised in that this first via Footpath comprises one first transmission path and one first RX path, and this second path comprises one second transmission path Footpath and this first RX path.

10. the compensation method of sampling phase difference as claimed in claim 9, it is characterised in that this first biography Sending path to comprise one first digital to analog converter, one first transmit wave filter and a multiplexer, this is the years old Two transmit path comprises one second digital to analog converter, one second transmission wave filter and this multiplexer, This first RX path comprises one first receiving filter and one first analog-to-digital converter.

The compensation method of 11. sampling phase as claimed in claim 8 differences, it is characterised in that this phase contrast Relation is that this frequency dependent phase contrast summation with this sampling phase difference is along with the variation relation of frequency.

The compensation method of 12. sampling phase as claimed in claim 11 differences, it is characterised in that perform phase The step of displacement error compensation comprises: compensate this sampling phase according to this variation relation poor.

The compensation method of 13. sampling phase as claimed in claim 11 differences, it is characterised in that this change Relation is a class linear change.

The compensation method of 14. sampling phase as claimed in claim 8 differences, it is characterised in that this predetermined fortune Calculation comprises quick Fourier transformation computation, phase angle calculates and phase step estimates at least one computing.

15. 1 kinds of communication devices that can compensate for sampling phase difference, comprise:

One signal generator, is used for exporting one first signal in a very first time interval, and is used in one Output one secondary signal in second time interval, wherein this first and second time interval is different；

One first digital to analog converter, couples this signal generator, is used for this first signal is performed number Word is to analog-converted, to produce simulation first signal；

One first transmits wave filter, couples this first digital to analog converter, is used for filtering this simulation first Signal, to produce filtering first signal；

One second digital to analog converter, couples this signal generator, is used for this secondary signal is performed number Word is to analog-converted, to produce a simulation secondary signal；

One second transmits wave filter, couples this second digital to analog converter, is used for filtering this simulation second Signal, to produce a filtering secondary signal；

One multiplexer, couple this first and second transmit wave filter, be used for export this filtering first and second letter Number；

One first receiving filter, couples this multiplexer, is used for filtering this filtering first signal to produce again and again Filter the first signal and this filtering secondary signal and filter the first signal again and again to produce；

One first analog-to-digital converter, couples this first receiving filter, is used for filtering this again first Signal analogs to the first signal after numeral conversion transmits with generation one, and this filters secondary signal again Analog to numeral conversion with secondary signal after generation one transmission；And

One receiving terminal digital front end circuitry, comprises:

One signal analyzer, couples this first analog-to-digital converter, is used for after this transmission first and the Binary signal imposes a predetermined operation, and after thereby measuring this transmission, the phase contrast between first and second signal closes System, wherein this phase contrast relationship one frequency dependent phase contrast and a sampling phase are poor；And

One compensator, is used for performing phase difference compensation according to this phase contrast relation.

16. communication devices that can compensate for sampling phase difference as claimed in claim 15, it is characterised in that This phase contrast relation is that this frequency dependent phase contrast summation with this sampling phase difference is along with the change pass of frequency System.

17. communication devices that can compensate for sampling phase difference as claimed in claim 16, it is characterised in that It is poor that this compensator is used for compensating this sampling phase according to this variation relation, and this signal generator further includes a transmission End digital front end circuitry, in order to compensate this frequency dependent phase contrast.

18. communication devices that can compensate for sampling phase difference as claimed in claim 16, it is characterised in that This variation relation is a class linear change.

19. communication devices that can compensate for sampling phase difference as claimed in claim 15, it is characterised in that This predetermined operation comprises quick Fourier transformation computation, phase angle calculates and phase step estimates computing extremely One of few.