CN108616274A - The bandwidth adjusting method of phase-locked loop unit and relevant Bandwidth adjustment unit and weakened phase restoring module - Google Patents
The bandwidth adjusting method of phase-locked loop unit and relevant Bandwidth adjustment unit and weakened phase restoring module Download PDFInfo
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- CN108616274A CN108616274A CN201611128893.3A CN201611128893A CN108616274A CN 108616274 A CN108616274 A CN 108616274A CN 201611128893 A CN201611128893 A CN 201611128893A CN 108616274 A CN108616274 A CN 108616274A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/104—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional signal from outside the loop for setting or controlling a parameter in the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Abstract
A kind of bandwidth adjusting method is used for a phase-locked loop unit of a weakened phase restoring module, includes to adjust the bandwidth of operation of phase-locked loop unit as the first bandwidth；Measure multiple first phase errors between compensated input signal and reference clock signal, and one first statistical value of multiple first phase errors is obtained, wherein compensated input signal system is according to produced by an input signal and a phase compensation signal of phase-locked loop unit generation；The bandwidth of operation for adjusting phase-locked loop unit is the second bandwidth；Multiple second phase errors between compensated input signal and reference clock signal are measured, and obtain the second statistical value of multiple second phase errors；And according to the first statistical value and the second statistical value, adjust bandwidth of operation；Wherein the first bandwidth and the second bandwidth system are obtained using the bandwidth upper limit and lower band interpolation.
Description
Technical field
The present invention means a kind of bandwidth adjusting method for phase-locked loop unit in weakened phase restoring module and relevant band
Wide adjustment unit and weakened phase restoring module, phase error optimizes phase-locked loop in espespecially a kind of weakened phase restoring module through statistics
The bandwidth adjusting method of unit bandwidth and relevant Bandwidth adjustment unit and weakened phase restoring module.
Background technology
Phase-locked loop (Phase-Locked Loop) circuit is to generate a periodic output signal, and this is periodically defeated
Going out has fixed phase relation between anticipated signal and a periodic input signal.Phase-locked loop circuit is widely used in respectively
In the circuit system of formula various kinds, such as data and clock recovery circuitry (the Clock and Data of wireless communication system
Recovery), transceiver module (Transceiver) or clock generator (Frequency Synthesizer), and be not limited to
This.
According to the characteristic (such as frequency) and circuit requirements of input signal, the bandwidth (Loop of phase-locked loop circuit
Bandwidth) and damped coefficient (Damping Factor) need to be designed suitably, between lock speed and locking accuracy
Obtain balance.However, due to input signal characteristic can due to environmental factor (such as noise) influences as the time changes, if
The bandwidth and damped coefficient of phase-locked loop circuit immobilize, and the efficiency of phase-locked loop circuit just can not maintain always design
Optimum value.Therefore, the characteristic that phase-locked loop circuit how is adaptively adjusted when phase-locked loop circuit operates becomes as industry
Want the subject under discussion inquired into.
Invention content
In order to solve the problem above-mentioned, the present invention provides phase error in a kind of weakened phase restoring module through statistics is next excellent
Change the bandwidth adjusting method and relevant Bandwidth adjustment unit and weakened phase restoring module of phase-locked loop unit bandwidth.
On the one hand, the present invention provides a kind of bandwidth adjusting method, for a weakened phase restoring mould in a wireless communication system
One phase-locked loop unit of block.The bandwidth adjusting method includes that adjust a bandwidth of operation of the phase-locked loop unit be one the
One bandwidth；Multiple first phase errors between a compensated input signal and a reference clock signal are measured, and obtain multiple first
One first statistical value of phase error, wherein the compensated input signal system are generated according to an input signal and the phase-locked loop unit
A phase compensation signal produced by；The bandwidth of operation for adjusting the phase-locked loop unit is one second bandwidth；Measure the compensation
Multiple second phase errors between input signal and the reference clock signal, and obtain the one second of multiple second phase error
Statistical value；And according to first statistical value and second statistical value, adjust the bandwidth of operation；Wherein first bandwidth and this
Two bandwidth systems are obtained using a bandwidth upper limit and a lower band interpolation.
On the other hand, the present invention provides a kind of Bandwidth adjustment unit, for a weakened phase restoring in a wireless communication system
Module.The Bandwidth adjustment unit includes a statistical circuit, for noting down the letter of the input after the weakened phase restoring module for compensating
Multiple phase errors number between a reference clock signal, and a statistical value of multiple phase error is calculated to generate a statistics
Indication signal；One control circuit is used for, according to the statistics indication signal, generating a bandwidth indication signal；And a conversion circuit,
For according to the bandwidth indication signal, generation controls a bandwidth of operation of a phase-locked loop unit in the weakened phase restoring module extremely
A few filter coefficient.
In another aspect, the present invention provides a kind of weakened phase restoring module being used for a wireless communication system.The phase
It includes a multiplication unit to reply module, is used for an input signal being multiplied with a phase compensation signal, defeated to generate a compensation
Enter signal；One phase error detecting unit, for detecting the phase difference between the compensated input signal and a reference clock signal；
One phase-locked loop unit is used for, according to the phase difference, generating the phase compensation signal；And a Bandwidth adjustment unit, for adjusting
After one bandwidth of operation of the whole phase-locked loop unit is one first bandwidth, the phase difference is obtained as multiple first phase errors,
And obtain one first statistical value of multiple first phase error；The bandwidth of operation for adjusting the phase-locked loop unit is one second
After bandwidth, the phase difference is obtained as multiple second phase errors, and obtains one second statistics of multiple second phase error
Value；And according to first statistical value and second statistical value, adjust the bandwidth of operation；Wherein first bandwidth and second bandwidth
System is obtained using a bandwidth upper limit and a lower band interpolation.
Description of the drawings
Fig. 1 is the schematic diagram of one weakened phase restoring module of the embodiment of the present invention.
Fig. 2 is the relational graph of bandwidth of operation and phase error in one embodiment of the invention.
Fig. 3 is the schematic diagram of one realization method of statistical circuit shown in Fig. 1.
Fig. 4 is the schematic diagram of one realization method of control circuit shown in Fig. 1.
Fig. 5 is the schematic diagram of one realization method of conversion circuit shown in Fig. 1.
Fig. 6 is the flow chart of one flow of the embodiment of the present invention.
Symbol description
10 weakened phase restoring modules
100 multiplication units
102 phase error detecting units
104 phase-locked loop units
106 Bandwidth adjustment units
108 filters
110 oscillators
112 statistical circuits
114 control circuits
116 conversion circuits
300,500 arithmetical unit
302,400,404,406 adder
304 counting units
306 dividers
402,502 multiplier
408 judging units
60 flows
600~612 steps
C constants
BW1、BW2Bandwidth
BWFBandwidth of operation
BWLLower band
BWOPTOptimum bandwidth
BWS bandwidth indication signals
BWUThe bandwidth upper limit
CIN compensated input signals
IN input signals
KP、KIFilter coefficient
PC phase compensation signals
STA counts indication signal
SUMMSummation
VAR1, VAR2 variance
Φ、Φ1、Φ2Phase error
- Φ phase compensations
VAR(Φ)MINLowest phase error variance
Specific implementation mode
Referring to FIG. 1, Fig. 1 is the schematic diagram of one weakened phase restoring module 10 of the embodiment of the present invention.Weakened phase restoring module 10 is used
In a communication system, for compensating the phase error of an input signal IN.As shown in Figure 1, weakened phase restoring module 10 includes one
Multiplication unit 100, a phase error detecting unit 102, a phase-locked loop unit 104 and a Bandwidth adjustment unit 106.Multiplication list
Member 100 is used for input signal IN being multiplied with a phase compensation signal PC, to obtain a compensated input signal CIN.Phase error
Detecting unit 102 is used for obtaining in compensated input signal CIN and communication system between a reference clock signal (not being illustrated in Fig. 1)
Phase error Φ.Phase-locked loop unit 104 includes filter 108 and oscillator 110, for being adjusted according to phase error Φ
Phase compensation signal PC, to minimize phase error Φ.In this embodiment, Bandwidth adjustment unit 106 can calculate phase-locked loop
The variance (Variance) of the running of unit 104 phase error Φ in different bandwidth, and phase-locked loop unit 104 is adjusted according to this
Bandwidth of operation BWF.In this situation, the bandwidth of operation BW of phase-locked loop unit 104FIt can be according to the input with time change
Signal IN is adaptively adjusted, to optimize the task performance of weakened phase restoring module 10.
Specifically, input signal IN, phase compensation signal PC and compensated input signal CIN can be respectively with following equations
It indicates：
By equation (1)~(3) it is found that the phase of compensated input signal CIN is the phase and phase of input signal IN
The sum of the phase of thermal compensation signal PC.In order to make communication system that can correctly sample input signal IN, reference clock signal and compensation
Phase error Φ between input signal CIN is preferably close in 0.Therefore, filter 108 can generate phase according to phase error Φ
It compensates (- Φ), phase compensation (- Φ) adjustment phase place thermal compensation signal PC produced by the meeting foundation filter 108 of oscillator 110, with
Reduce the phase error Φ between reference clock signal and compensated input signal CIN.
It is worth noting that, the bandwidth of operation BW of filter 108FThe adjustment of phase error Φ can be impacted.It please join
Fig. 2 is examined, Fig. 2 is bandwidth of operation BW in one embodiment of the inventionFWith the relational graph between phase variation error number VAR (Φ).In Fig. 2
In, phase variation error number VAR (Φ) is in a bandwidth upper limit BWUAn and lower band BWLBetween be to be rendered as a convex function
(Convex Function).That is, phase variation error number VAR (Φ) is in bandwidth upper limit BWUAnd lower band BWLBetween
Have a lowest phase error variance VAR (Φ)MIN.If the bandwidth of operation BW of filter 108FIt is adjusted to correspond to minimum
Phase variation error number VAR (Φ)MINOptimum bandwidth BWOPT, weakened phase restoring module 10 can obtain best phase error Φ.
Therefore, the embodiment of the present invention increases Bandwidth adjustment unit 106 newly and operates on different operating bandwidth BW to note down weakened phase restoring module 10F
Under phase variation error number VAR (Φ), by the bandwidth of operation BW of filter 108FIt is adjusted to correspond to lowest phase error
Variance VAR (Φ)MINOptimum bandwidth BWOPT.Thus, the bandwidth of operation BW of filter 108FIt can be with time-varying spy
Property input signal IN change, to improve the task performance of weakened phase restoring module 10.
About Bandwidth adjustment unit 106 by the bandwidth of operation BW of filter 108FIt is adjusted to correspond to lowest phase error change
Heteromerism VAR (Φ)MINOptimum bandwidth BWOPTFunction mode, be illustrated below.It originates and operates in weakened phase restoring module 10
When, the control circuit 114 in Bandwidth adjustment unit 106 can adjust a bandwidth indication signal BWS to indicate a bandwidth BW1,
Middle bandwidth BW1Between bandwidth upper limit BWUWith lower band BWLBetween and be by bandwidth upper limit BWUWith lower band BWLInterpolation obtains
Go out.In one embodiment, bandwidth BW-1It is represented by：
BW1=BWL+C×(BWU-BWL) (4)
Wherein, C is the constant between 1 and 0.In one embodiment, constant C is equal to 0.61803, and without being limited thereto.
According to instruction bandwidth BW1Bandwidth indication signal BWS, conversion circuit 116 generate correspond to bandwidth BW1Filter parameter KP、KI
To filter 108, using by the Bandwidth adjustment of filter 108 as bandwidth BW1.Filter parameter KP、KISystem and bandwidth BW1It is directly proportional.
In one embodiment, filter parameter KPSystem and bandwidth BW1First power it is directly proportional, and filter parameter KISystem and bandwidth BW1's
Quadratic power is directly proportional.It is bandwidth BW in the bandwidth of filter 1081In the case of, communication system starts to receive input signal IN, multiplies
Method unit 100 generates compensated input signal CIN using the phase of phase compensation signal PC adjustment input signals IN.According to phase
Phase error Φ acquired by Fault detection unit 102, filter 108 generates phase compensation (- Φ) so that oscillator 110 is adjusted
Whole phase compensation signal PC.At this point, statistical circuit 112 can be by phase error Φ records for corresponding to bandwidth BW1Phase error
Φ1.For example, phase error Φ when 112 system of statistical circuit record communication system is per sub-sampling input signal IN is as phase
Position error Φ1.Obtaining a certain amount of phase error Φ1(such as 10000 phase error Φ1) after, statistical circuit 112 is united
The noted down phase error Φ of meter1Variance VAR1, and by statistics indication signal STA by variance VAR1It is sent to control
Circuit 114.
Next, control circuit 114 can adjust bandwidth indication signal BWS, to indicate another bandwidth BW2, wherein bandwidth BW2-
Also between bandwidth upper limit BWUWith lower band BWLBetween, and be by bandwidth upper limit BWUWith lower band BWLInterpolation obtains.One
In embodiment, bandwidth BW-2It is represented by：
BW2=BWU-C×(BWU-BWL) (5)
In this embodiment, since constant C is equal to 0.61803, bandwidth BW2Less than bandwidth BW1.According to instruction bandwidth
BW2Bandwidth indication signal BWS, conversion circuit 116 generate correspond to bandwidth BW2Filter parameter KP、KITo filter
108, using by the Bandwidth adjustment of filter 108 as bandwidth BW2.It is changed to bandwidth BW in the bandwidth of filter 1082In the case of, communication
Systems stay receives input signal IN, and oscillator 110 continues to adjust phase according to phase compensation (- Φ) produced by filter 108
Position thermal compensation signal PC.At this point, the bandwidth of filter 108 can be bandwidth BW by statistical circuit 1122When phase error Φ record be
Corresponding to bandwidth BW2Phase error Φ2.Obtaining certain amount of phase error Φ2(such as 10000 phase error Φ2)
Afterwards, statistical circuit 112 counts noted down phase error Φ2Variance VAR2, and will make a variation by statistics indication signal STA
Number VAR2It is sent to control circuit 114.
Obtaining variance VAR1、VAR2Later, control circuit 114 can be according to variance VAR1、VAR2Between magnitude relationship
Bandwidth indication signal BWS is adjusted, with the bandwidth of operation BW of Optimal Filter 108F.As variance VAR1Less than variance VAR2When,
Control circuit 114 is by bandwidth BW2As new lower band BWL, by bandwidth BW2It is set as bandwidth BW1And by variance VAR2It is set as
Variance VAR1(i.e. BWL=BW2、BW2=BW1、VAR2=VAR1).Then, control circuit 114 is according to new lower band BWLAnd
Bandwidth upper limit BWUCalculate new bandwidth BW1, and obtain and correspond to new bandwidth BW1Variance VAR1Come and variance VAR2Than
Compared with.
And work as variance VAR2Less than variance VAR1When, control circuit 114 is then by bandwidth BW1As the new bandwidth upper limit
BWU, by bandwidth BW1It is set as bandwidth BW2And by variance VAR1It is set as variance VAR2(i.e. BWU=BW1、BW1=BW2、VAR1=
VAR2).Then, control circuit 114 is according to new bandwidth upper limit BWUAnd lower band BWLCalculate new bandwidth BW2, and acquirement pair
The bandwidth BW of Ying Yuxin2Variance VAR2Come and variance VAR1Compare.
Compare variance VAR through repetition1、VAR2Between magnitude relationship adjust bandwidth indication signal BWS, Bandwidth adjustment
Adjust to 106 adaptability of unit the bandwidth of operation BW of filter 108F.When for generating bandwidth BW1、BW2The bandwidth upper limit with
When gap between lower band is less than a threshold value, Bandwidth adjustment unit 106 judges that the bandwidth upper limit at this time has become with lower band
It is bordering on optimum bandwidth BWOPT, and obtain the bandwidth upper limit and bandwidth of operation BW of the lower band one of which as filter 108F。
Thus, the bandwidth of operation BW of filter 108FIt is i.e. optimised, to promote the operational effectiveness of weakened phase restoring module 10.
According to different application and design concept, Bandwidth adjustment unit 106 can be obtained otherwise corresponding to minimum phase
Position error variation number VAR (Φ)MINOptimum bandwidth BWOPT, and statistical circuit 112, control circuit 114 and conversion circuit 116 can
It realizes in a wide variety of ways.For example, be not limited to can using the variance of phase error Φ for Bandwidth adjustment unit 106
Using other statistical values of phase error Φ as judging optimum bandwidth BWOPTFoundation.
Referring to FIG. 3, Fig. 3 is the schematic diagram of 112 1 realization method of statistical circuit shown in Fig. 1.In figure 3, statistical circuit
112 include an arithmetical unit 300, an adder 302, a counting unit 304 and a divider 306.Arithmetical unit 300 is used
To note down phase error Φ, and square (the i.e. Φ of output phase error Φ2) to adder 302.Adder 302 is by Φ2With in one
Way summation SUMMAfter addition, output to counting unit 304.Counting unit 304, which counts, receives Φ2With midway summation SUMMThe sum of
Number.As reception Φ2With midway summation SUMMThe sum of number be less than specific times (such as 10000 times) when, counting unit 304 will
The Φ received2With midway summation SUMMThe sum of as new midway summation SUMM, and by new midway summation SUMMOutput extremely adds
Method unit 302；And as reception Φ2With midway summation SUMMThe sum of number when reaching specific times, counting unit 304 will be connect
The Φ of receipts2With midway summation SUMMThe sum of as output to divider summation SUM.Divider 306 is in receiving summation
After SUM, summation SUM divided by the specific times to obtain the variance of specific quantity phase error Φ, and refer to by statistics
Show that variance is sent to control circuit 114 by signal STA.
In one embodiment, a delayer can be increased between adder 302 and counting unit 304 newly, to ensure adder 302
With 304 normal operation of counting unit.
Referring to FIG. 4, Fig. 4 is the schematic diagram of 114 1 realization method of control circuit shown in Fig. 1.As shown in figure 4, control electricity
Road 114 includes 400,404,406, one multiplier 402 of adder and a judging unit 408.Adder 400 is used for computation bandwidth
Upper limit BWUWith lower band BWLBetween difference, and export to multiplier 402.Multiplier 402 is used for computation bandwidth upper limit BWUWith
Lower band BWLBetween difference be multiplied by the product of constant C and give adder 404,406.Then, adder 404 is by lower band BWL
In addition the output of multiplier 402 generates bandwidth BW1, and adder 406 is by bandwidth upper limit BWUThe output for subtracting multiplier 402 comes
Generate bandwidth BW2.According to statistics indication signal STA, judging unit 408 adaptively adjusts bandwidth upper limit BWU, lower band BWL
And bandwidth indication signal BWS.Bandwidth BW is not indicated in statistics indication signal STA1Variance VAR1And bandwidth BW2Variance
VAR2When, judging unit 408 adjusts bandwidth indication signal BWS to indicate bandwidth BW1And BW2, to obtain variance VAR respectively1And
Variance VAR2.According to acquired variance VAR1And variance VAR2Between magnitude relationship, judging unit 408 adjust bandwidth
Upper limit BWU, lower band BWLAnd bandwidth indication signal BWS, with the bandwidth BW of Optimal Filter 108F.As variance VAR1It is less than
Variance VAR2When, judging unit 408 is by lower band BWLIt is adjusted to bandwidth BW2, and bandwidth indication signal BWS is adjusted to indicate
Bandwidth BW2；And work as variance VAR1More than variance VAR2When, judging unit 408 is by bandwidth upper limit BWUIt is adjusted to bandwidth BW1, and
Bandwidth indication signal BWS is adjusted to indicate bandwidth BW1。
Referring to FIG. 5, Fig. 5 is the schematic diagram of 116 1 realization method of conversion circuit shown in Fig. 1.In Figure 5, conversion circuit
116 include an arithmetical unit 500 and a multiplier 502.116 system of conversion circuit shown in fig. 5 is directly by bandwidth indication signal
BWS is as filter coefficient KP(i.e. filter coefficient KPEqual to the bandwidth indicated by bandwidth indication signal BWS), and utilize arithmetic
After one square of bandwidth indicated by 500 computation bandwidth indication signal BWS of unit, this square and a resistance are calculated using multiplier 502
Product between square inverse of Buddhist nun's coefficient ζ is as filter coefficient KI.According to different application and design concept, damping coefficientζ can
It is preset as arbitrary constant.
Bandwidth adjustment unit 106 counts phase-locked loop unit 104 and operates on different bandwidth of operation BWFWhen phase error Φ come
The bandwidth BW of Optimal Filter 108FMode can be summarized as a flow 60, as shown in Figure 6.Flow 60 can be used for a wireless communication
One weakened phase restoring module of system is used for the bandwidth of operation that adjustment phase place replys a phase-locked loop unit in module.Flow 60 is wrapped
Contain following steps：
Step 600：Start.
Step 602：The bandwidth of operation for adjusting the phase-locked loop unit is one first bandwidth.
Step 604：It measures according to multiple first phase errors between a compensated input signal and a reference clock signal, and
Obtain one first statistical value of multiple first phase error.
Step 606：The bandwidth for adjusting the phase-locked loop unit is one second bandwidth.
Step 608：Multiple second phase errors between the compensated input signal and the reference clock signal are measured, and are obtained
One second statistical value of multiple second phase error.
Step 610：According to first statistical value and second statistical value, the bandwidth of operation is adjusted.
Step 612：Terminate.
According to flow 60, the bandwidth of operation of phase-locked loop unit is first adjusted to one first bandwidth, wherein the first bandwidth is situated between
Between a bandwidth upper limit and a lower band and it is to be obtained using the bandwidth upper limit and lower band interpolation.It is received in communication system
When one input signal, phase-locked loop unit will produce the phase that a thermal compensation signal carrys out compensated input signal, defeated to generate a compensation
Enter signal.According to the phase error between compensated input signal and a reference clock signal, the phase-locked loop of the first bandwidth is operated on
Unit adjusts thermal compensation signal to reduce the phase error between compensated input signal and reference clock signal.At the same time, it compensates defeated
Enter the phase error between signal and reference clock signal and can be recorded for first phase error, and calculates multiple first phase and miss
The first statistical value (such as variance) of difference.
After obtaining the first statistical value, the bandwidth of operation of phase-locked loop unit is adjusted to one second bandwidth, wherein second
Bandwidth is between the bandwidth upper limit and lower band and is obtained using the bandwidth upper limit and lower band interpolation.In this embodiment
In, the second bandwidth is less than the first bandwidth.When communication system receives input signal, the phase-locked loop unit of the second bandwidth is operated on
Can according to the phase error adjustment thermal compensation signal between compensated input signal and reference clock signal with reduce compensated input signal with
Phase error between reference clock signal.At this point, the phase error between compensated input signal and reference clock signal can be recorded
For second phase error, and calculate the second statistical value of multiple second phase errors.
According to the magnitude relationship between the first statistical value and the second statistical value, weakened phase restoring module adaptability locking phase is adjusted
The bandwidth of operation of circuit units.When the first variance is less than the second variance, lower band can be replaced by the second bandwidth.Root
According to new lower band and original bandwidth upper limit, phase error module interpolation goes out a third bandwidth.Next, phase error mould
The bandwidth of operation of phase-locked loop unit is adjusted to third bandwidth by block, to obtain multiple third phases corresponding to the third bandwidth
The third statistical value of position error and multiple third phase errors.After obtaining third statistical value, weakened phase restoring module again depending on
Magnitude relationship between first statistical value and third statistical value adjusts the bandwidth of operation of phase-locked loop unit.
And when the second variance is less than the first variance, the bandwidth upper limit can be replaced by the first bandwidth.According to new band
The wide upper limit and original lower band, phase error module interpolation go out one the 4th bandwidth.Next, phase error module is by locking phase
The bandwidth of operation of circuit units is adjusted to the 4th bandwidth, corresponds to multiple 4th phase errors of the 4th bandwidth simultaneously with record
Obtain the 4th statistical value of multiple 4th phase errors.After obtaining the 4th statistical value, weakened phase restoring module is again depending on second
Magnitude relationship between statistical value and the 4th statistical value adjusts the bandwidth of operation of phase-locked loop unit.Through flow 60, phase-locked loop
The bandwidth of operation of unit can be optimised, to promote the task performance of weakened phase restoring module.
Through the statistical value for calculating phase error of the phase-locked loop unit running under different operating bandwidth, the present invention is implemented
The weakened phase restoring module of example can adaptively change the work band of phase-locked loop unit according to the input signal with time-varying characteristics
It is wide.Thus, which phase-locked loop unit can be optimised, to promote the task performance of weakened phase restoring module.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (12)
1. a kind of bandwidth adjusting method, for a phase-locked loop unit of a weakened phase restoring module in a wireless communication system, packet
Contain：
The bandwidth of operation for adjusting the phase-locked loop unit is one first bandwidth；
Multiple first phase errors between a compensated input signal and a reference clock signal are measured, and obtain multiple first phase
One first statistical value of position error, wherein the compensated input signal system are generated according to an input signal and the phase-locked loop unit
Produced by one phase compensation signal；
The bandwidth of operation for adjusting the phase-locked loop unit is one second bandwidth；
Multiple second phase errors between the compensated input signal and the reference clock signal are measured, and obtain multiple second phase
One second statistical value of position error；And
According to first statistical value and second statistical value, the bandwidth of operation is adjusted；
Wherein first bandwidth and the second bandwidth system is obtained using a bandwidth upper limit and a lower band interpolation.
2. bandwidth adjusting method as described in claim 1, which is characterized in that the first band is wider than second bandwidth, and root
According to first statistical value and second statistical value, the step of adjusting the bandwidth of operation, includes：
When first statistical value is less than second statistical value, it is second bandwidth to adjust the lower band；
Go out a third bandwidth using lower band interpolation after the bandwidth upper limit and the adjustment；
The bandwidth for adjusting the phase-locked loop unit is the third bandwidth；
Multiple third phase errors between the compensated input signal and the reference clock signal are measured, and obtain multiple third phase
One third statistical value of position error；And
According to first statistical value and the third statistical value, the bandwidth of operation is adjusted.
3. bandwidth adjusting method as described in claim 1, which is characterized in that the first band is wider than second bandwidth, and root
According to first statistical value and second statistical value, the step of adjusting the bandwidth of operation, includes：
When second statistical value is less than first statistical value, it is first bandwidth to adjust the bandwidth upper limit；
Go out a third bandwidth using the bandwidth upper limit after the adjustment and the lower band interpolation；
The bandwidth for adjusting the phase-locked loop unit is the third bandwidth；
Multiple third phase errors between the compensated input signal and the reference clock signal are measured, and obtain multiple third phase
One third statistical value of position error；And
According to second statistical value and the third statistical value, the bandwidth of operation is adjusted.
4. a kind of Bandwidth adjustment unit includes for a weakened phase restoring module in a wireless communication system：
One statistical circuit is more between the input signal after the weakened phase restoring module for compensating and a reference clock signal for noting down
A phase error, and a statistical value of multiple phase error is calculated to generate a statistics indication signal；
One control circuit is used for, according to the statistics indication signal, generating a bandwidth indication signal；And
One conversion circuit is used for, according to the bandwidth indication signal, generating and controlling a phase-locked loop unit in the weakened phase restoring module
A bandwidth of operation an at least filter coefficient.
5. Bandwidth adjustment unit as claimed in claim 4, which is characterized in that the statistical circuit includes：
One divider is used for by a summation divided by a threshold number, to generate the statistical value of multiple phase error；
One arithmetical unit, for calculating square of the phase error；
One adder, for calculate the phase error square the sum of with a midway summation；And
One counting unit, for counting the receive number square with the sum of the midway summation for receiving the phase error；At this
When receive number is less than the threshold number, by the phase error square with the sum of the midway summation as output to the adder
The midway summation；And the receive number be equal to the threshold number when, by the phase error square with the midway summation it
With as the summation.
6. Bandwidth adjustment unit as claimed in claim 4, which is characterized in that the control circuit includes：
One first adder, for calculating the difference between a bandwidth upper limit and a lower band；
One multiplier, for calculating the product between the difference and a constant；
One second adder is used as one first bandwidth for the sum of calculating between the lower band and the product；
One third adder, for calculating the difference between the bandwidth upper limit and the product as one second bandwidth；And
One judging unit is used for, according to the statistics indication signal, adjusting the bandwidth upper limit, the lower band and bandwidth instruction letter
Number.
7. Bandwidth adjustment unit as claimed in claim 6, which is characterized in that when statistics indication signal instruction correspond to this
When one first statistical value of one bandwidth is less than second statistical value corresponding to second bandwidth, which adjusts the bandwidth
Lower limit is second bandwidth, and adjusts the bandwidth indication signal and indicate first bandwidth.
8. Bandwidth adjustment unit as claimed in claim 6, which is characterized in that when statistics indication signal instruction correspond to this
When one first statistical value of one bandwidth is more than second statistical value corresponding to second bandwidth, which adjusts the bandwidth
The upper limit is first bandwidth, and adjusts the bandwidth indication signal and indicate second bandwidth.
9. Bandwidth adjustment unit as claimed in claim 4, which is characterized in that the conversion circuit exports the bandwidth indication signal
For a first filter coefficient in this at least a filter coefficient and include：
One arithmetical unit, for calculating one square of bandwidth indicated by the bandwidth indication signal；And
One multiplier, product one of between square derivative for calculating this square and a damped coefficient, as at least one filtering
A second filter coefficient in device coefficient.
10. a kind of weakened phase restoring module is used for a wireless communication system, includes：
One multiplication unit is used for an input signal being multiplied with a phase compensation signal, to generate a compensated input signal；
One phase error detecting unit, for detecting the phase difference between the compensated input signal and a reference clock signal；
One phase-locked loop unit is used for, according to the phase difference, generating the phase compensation signal；And
One Bandwidth adjustment unit, for adjust the phase-locked loop unit a bandwidth of operation be one first bandwidth after, obtain the phase
Potential difference obtains one first statistical value of multiple first phase error as multiple first phase errors；The locking phase is adjusted to return
The bandwidth of operation of road unit be one second bandwidth after, obtain the phase difference as multiple second phase errors, and it is more to obtain this
One second statistical value of a second phase error；And according to first statistical value and second statistical value, adjust the bandwidth of operation；
Wherein first bandwidth and the second bandwidth system is obtained using a bandwidth upper limit and a lower band interpolation.
11. weakened phase restoring module as claimed in claim 10, which is characterized in that the first band is wider than second bandwidth, and
For the Bandwidth adjustment unit when first statistical value is less than second statistical value, it is second bandwidth to adjust the lower band；Profit
Go out a third bandwidth with lower band interpolation after the bandwidth upper limit and the adjustment；The bandwidth for adjusting the phase-locked loop unit is should
Third bandwidth；Multiple third phase errors between the compensated input signal and the reference clock signal are measured, and are obtained multiple
One third statistical value of third phase error；And according to first statistical value and the third statistical value, adjust the bandwidth of operation.
12. weakened phase restoring module as claimed in claim 10, which is characterized in that the first band is wider than second bandwidth, and
For the Bandwidth adjustment unit when second statistical value is less than first statistical value, it is first bandwidth to adjust the bandwidth upper limit；Profit
Go out a third bandwidth with the bandwidth upper limit after the adjustment and the lower band interpolation；The bandwidth for adjusting the phase-locked loop unit is should
Third bandwidth；Multiple third phase errors between the compensated input signal and the reference clock signal are measured, and are obtained multiple
One third statistical value of third phase error；And according to second statistical value and the third statistical value, adjust the bandwidth of operation.
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