CN104427545B - A kind of method and apparatus for determining frequency deviation, initial phase and error vector magnitude - Google Patents
A kind of method and apparatus for determining frequency deviation, initial phase and error vector magnitude Download PDFInfo
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- CN104427545B CN104427545B CN201310367595.XA CN201310367595A CN104427545B CN 104427545 B CN104427545 B CN 104427545B CN 201310367595 A CN201310367595 A CN 201310367595A CN 104427545 B CN104427545 B CN 104427545B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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Abstract
The embodiments of the invention provide it is a kind of determine frequency deviation, initial phase and EVM method and apparatus, for being tested in RF consistency in frequency deviation, initial phase and EVM are accurately estimated, reduce amount of calculation.This method includes：The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；According to the over-sampling multiple of each sampled point of the oversampled signals in the preset first range near the peak of the correlation, and the oversampled signals, down-sampling processing is carried out to the oversampled signals, no oversampled signals are obtained；It is determined that without average power content in oversampled signals it is maximum all the way without oversampled signals；According to average power content maximum all the way without oversampled signals, special used for physical control channel DPCCH soft bit is determined；Frequency deviation is determined according to the DPCCH soft bits.
Description
Technical field
The present invention relates to moving communicating field, more particularly to a kind of frequency deviation, initial phase and error vector magnitude of determining
Method and apparatus.
Background technology
With the fast development of GSM, support that the terminal of multiple types is also developed rapidly, at present eventually
End manufacturer developed support global system for mobile communications (Global System for Mobile communication,
GSM), WCDMA (Wideband Code Division MultipleAccess, WCDMA), time division synchronous code division are more
Location (Time Division-Synchronous Code Division MultipleAccess, TD-SCDMA), Long Term Evolution
The Related product of multiple types such as (Long Term Evolved, LTE)., it is necessary to enter to it before the networking of these end products
Row uniformity test, and RF consistency therein test is most basic test therein, is the base for carrying out other tests
Plinth.
In the test of existing WCDMA RF consistencies, carry out error vector magnitude (ErrorVector Magnitude,
When EVM) testing, successively need accurately to calculate sampling timing, frequency deviation and initial phase, if data above calculates inaccurate
It can really cause inaccurate because of interfering components between the excessive frequency deviation of residual, skew and sampling point in the EVM measured.
Wherein, for sampling timing, prior art typically uses high power over-sampling and carries out pilot tone correlation and seek correlation
The method of peak obtains Timing Synchronization, can there is that peak is inaccurate asks in high sampling and larger frequency deviation
Topic, can produce influence to the precision of timing, and Timing Synchronization is inaccurate and the frequency deviation that to measure, initial phase are inaccurate.For
Frequency deviation, theoretic maximum- likelihood estimation complexity is high, typically carries out calculating frequency deviation, its accuracy using its approximate data
Have certain loss.In addition, the frequency deviation and the method for EVM estimated service life iteration that also have, parameter are difficult to determine, and realize multiple
It is miscellaneous.For initial phase, prior art needs to carry out chip DBMS frequency deviation compensation, removes modulation intelligence, carries out chip-level again
The estimation of initial phase, amount of calculation is high.
To sum up, in RF consistency test, prior art is difficult to accurately estimate frequency deviation, initial phase and EVM,
It is computationally intensive.
The content of the invention
The embodiments of the invention provide a kind of method and apparatus for determining frequency deviation, initial phase and EVM, in radio frequency one
Frequency deviation, initial phase and EVM are accurately estimated in the test of cause property, amount of calculation is reduced.
Concrete technical scheme provided in an embodiment of the present invention is as follows：
In a first aspect, a kind of method for determining frequency deviation, including：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
Adopted according to each of the oversampled signals in the preset first range near the peak of the correlation
Sampling point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with it is described
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first scope is extremely
Include two sampled points less；
It is determined that one-to-one without in oversampled signals with each sampled point of the oversampled signals in the range of first
Average power content it is maximum all the way without oversampled signals；
According to average power content maximum all the way without oversampled signals, Dedicated Physical Control Channel is determined
(Dedicated Physical Control CHannel, DPCCH) soft bit；
Frequency deviation is determined according to the DPCCH soft bits.
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference in a first aspect, in the first possible implementation, frequency deviation is determined according to the DPCCH soft bits, wrap
Include：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, carry out maximal possibility estimation and search
Rope, determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of first aspect, in second of possible implementation, according to described
DPCCH soft bits, determine the near-maximum-likelihood estimate of frequency deviation, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of first aspect, in the third possible implementation, in the frequency
In preset second range near inclined near-maximum-likelihood estimate, maximal possibility estimation search is carried out, frequency deviation is determined, wrapped
Include：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
Second aspect, a kind of method of determination initial phase, including：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
Adopted according to each of the oversampled signals in the preset first range near the peak of the correlation
Sampling point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with it is described
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first scope is extremely
Include two sampled points less；
It is determined that one-to-one without in oversampled signals with each sampled point of the oversampled signals in the range of first
Average power content it is maximum all the way without oversampled signals；
According to average power content maximum all the way without oversampled signals, Dedicated Physical Control Channel is determined
(Dedicated Physical Control CHannel, DPCCH) soft bit；
Frequency deviation is determined according to the DPCCH soft bits；
According to the DPCCH soft bits, and the frequency deviation, initial phase is determined.
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference to second aspect, in the first possible implementation, frequency deviation is determined according to the DPCCH soft bits, wrapped
Include：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, carry out maximal possibility estimation and search
Rope, determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of second aspect, in second of possible implementation, according to described
DPCCH soft bits, determine the near-maximum-likelihood estimate of frequency deviation, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of second aspect, in the third possible implementation, in the frequency
In preset second range near inclined near-maximum-likelihood estimate, maximal possibility estimation search is carried out, frequency deviation is determined, wrapped
Include：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
With reference to second aspect, in the 4th kind of possible implementation, according to the DPCCH soft bits, and the frequency
Partially, initial phase is determined, including：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
So, the conversion relation of consideration sign level data and the initial skew of chip DBMS when calculating is passed through so that
It is that DPCCH soft bits are handled only with sign level data, just can obtains chip-level initial phase.Compared to first obtaining chip
DBMS, then chip-level initial phase estimation is carried out, amount of calculation is low.
The third aspect, a kind of determination EVM method, including：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
Adopted according to each of the oversampled signals in the preset first range near the peak of the correlation
Sampling point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with it is described
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first scope is extremely
Include two sampled points less；
It is determined that one-to-one without in oversampled signals with each sampled point of the oversampled signals in the range of first
Average power content it is maximum all the way without oversampled signals；
According to average power content maximum all the way without oversampled signals, Dedicated Physical Control Channel is determined
(Dedicated Physical Control CHannel, DPCCH) soft bit；
Frequency deviation is determined according to the DPCCH soft bits；
According to the DPCCH soft bits, and the frequency deviation, initial phase is determined；
According to optimum sampling timing position, the frequency deviation and the initial phase, EVM is determined.
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference to the third aspect, in the first possible implementation, frequency deviation is determined according to the DPCCH soft bits, wrapped
Include：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, carry out maximal possibility estimation and search
Rope, determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of the third aspect, in second of possible implementation, according to described
DPCCH soft bits, determine the near-maximum-likelihood estimate of frequency deviation, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of the third aspect, in the third possible implementation, in the frequency
In preset second range near inclined near-maximum-likelihood estimate, maximal possibility estimation search is carried out, frequency deviation is determined, wrapped
Include：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
With reference to the third aspect, in the 4th kind of possible implementation, according to the DPCCH soft bits, and the frequency
Partially, initial phase is determined, including：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
So, the conversion relation of consideration sign level data and the initial skew of chip DBMS when calculating is passed through so that
It is that DPCCH soft bits are handled only with sign level data, just can obtains chip-level initial phase.Compared to first obtaining chip
DBMS, then chip-level initial phase estimation is carried out, amount of calculation is low.
With reference to the third aspect, in the 5th kind of possible implementation, according to optimum sampling timing position, the frequency deviation,
And the initial phase, EVM is determined, including：
It is determined that according to the oversampled signals near the optimum sampling timing position the default 3rd in the range of each adopt
The oversampled signals are carried out the down-sampling processing of identical with over-sampling processing multiple by sampling point, obtaining with the mistake
Each sampled point of the sampled signal in the range of the 3rd is one-to-one without oversampled signals；Wherein, the 3rd scope is little
In first scope；
According to the one-to-one nothing of each sampled point in the range of the frequency deviation and the initial phase pair and the described 3rd
Oversampled signals carry out frequency deviation compensation and phase offset compensation respectively；
According to frequency deviation compensate and phase offset compensation after with the described 3rd in the range of each sampled point correspondingly without mistake
Sampled signal, determines EVM.
So, because sample timing synchronization is accurate so that EVM is when being estimated, the 3rd scope only needs to take less
Value, therefore be that can determine that EVM values by less calculating.
Fourth aspect, a kind of equipment of determination frequency deviation, including：
Correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number enters
Row processing, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for default near the peak of the correlation according to the oversampled signals
Each sampled point in the range of first, and the oversampled signals over-sampling multiple, to the oversampled signals carry out under
Sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；
Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining and each sampled point of the oversampled signals in the range of first
It is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, being determined special according to average power content maximum
Physical control channel DPCCH soft bit；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits.
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference to fourth aspect, in the first possible implementation, the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, for the preset second range near the near-maximum-likelihood estimate of the frequency deviation
It is interior, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of fourth aspect, in second of possible implementation, the thick frequency
Inclined determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of fourth aspect, in the third possible implementation, the essence frequency
Inclined determining unit, specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
5th aspect, a kind of equipment for determining initial phase, including：
Correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number enters
Row processing, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for default near the peak of the correlation according to the oversampled signals
Each sampled point in the range of first, and the oversampled signals over-sampling multiple, to the oversampled signals carry out under
Sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；
Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining and each sampled point of the oversampled signals in the range of first
It is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, being determined special according to average power content maximum
Physical control channel DPCCH soft bit；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase.
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference to the 5th aspect, in the first possible implementation, the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, for the preset second range near the near-maximum-likelihood estimate of the frequency deviation
It is interior, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of the 5th aspect, in second of possible implementation, the thick frequency
Inclined determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of the 5th aspect, in the third possible implementation, the essence frequency
Inclined determining unit, specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
With reference to the 5th aspect, in the 4th kind of possible implementation, the initial phase determining unit, specifically for：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
So, the conversion relation of consideration sign level data and the initial skew of chip DBMS when calculating is passed through so that
It is that DPCCH soft bits are handled only with sign level data, just can obtains chip-level initial phase.Compared to first obtaining chip
DBMS, then chip-level initial phase estimation is carried out, amount of calculation is low.
6th aspect, a kind of determination EVM equipment, including：
Correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number enters
Row processing, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for default near the peak of the correlation according to the oversampled signals
Each sampled point in the range of first, and the oversampled signals over-sampling multiple, to the oversampled signals carry out under
Sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；
Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining and each sampled point of the oversampled signals in the range of first
It is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, being determined special according to average power content maximum
Physical control channel DPCCH soft bit；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase；
EVM determining units, for according to optimum sampling timing position, the frequency deviation and the initial phase, it is determined that
EVM。
So, after the peak of correlation is calculated, believing without over-sampling for recovery is handled according to using down-sampling
Number searched further for, selected after search it is corresponding without oversampled signals all the way be accurate sampling timing position, solve
Caused by correlation peaks position present in prior art is not accurate enough the problem of sampling timing low precision.Also, only root
DPCCH soft bits just can be accurately recovered without oversampled signals all the way according to this, and then determine frequency deviation, are calculated compared to prior art
Frequency deviation and EVM of the multichannel without oversampled signals, according to the data output frequency deviation all the way that EVM is minimum, it is to avoid multichannel is calculated and selected
Select, reduce amount of calculation.
With reference to the 6th aspect, in the first possible implementation, the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, for the preset second range near the near-maximum-likelihood estimate of the frequency deviation
It is interior, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
So, frequency deviation is substantially determined by near-maximum-likelihood algorithm first, then accurately determined by maximum likelihood algorithm
Frequency deviation, the result that this method is obtained is accurate, high compared to using only precision during near-maximum-likelihood algorithm, compared to using only most
Amount of calculation is low during maximum-likelihood algorithm.
With reference to the first possible implementation of the 6th aspect, in second of possible implementation, the thick frequency
Inclined determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
With reference to the first possible implementation of the 6th aspect, in the third possible implementation, the essence frequency
Inclined determining unit, specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
With reference to the 6th aspect, in the 4th kind of possible implementation, the initial phase determining unit, specifically for：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
So, the conversion relation of consideration sign level data and the initial skew of chip DBMS when calculating is passed through so that
It is that DPCCH soft bits are handled only with sign level data, just can obtains chip-level initial phase.Compared to first obtaining chip
DBMS, then chip-level initial phase estimation is carried out, amount of calculation is low.
With reference to the 6th aspect, in the 5th kind of possible implementation, the EVM determining units, specifically for：
It is determined that according to the oversampled signals near the optimum sampling timing position the default 3rd in the range of each adopt
The oversampled signals are carried out the down-sampling processing of identical with over-sampling processing multiple by sampling point, obtaining with the mistake
Each sampled point of the sampled signal in the range of the 3rd is one-to-one without oversampled signals；Wherein, the 3rd scope is little
In first scope；
According to the one-to-one nothing of each sampled point in the range of the frequency deviation and the initial phase pair and the described 3rd
Oversampled signals carry out frequency deviation compensation and phase offset compensation respectively；
According to frequency deviation compensate and phase offset compensation after with the described 3rd in the range of each sampled point correspondingly without mistake
Sampled signal, determines EVM.
So, because sample timing synchronization is accurate, so that EVM is when being estimated, the 3rd scope only needs to take less
Value, therefore be that can determine that EVM values by less calculating.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of method for determining frequency deviation provided in an embodiment of the present invention；
Fig. 2 is a kind of another schematic flow sheet of method for determining frequency deviation provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic flow sheet of method for determining initial phase provided in an embodiment of the present invention；
Fig. 4 is a kind of another schematic flow sheet of method for determining initial phase provided in an embodiment of the present invention；
Fig. 5 is a kind of schematic flow sheet of determination EVM provided in an embodiment of the present invention method；
Fig. 6 is a kind of another schematic flow sheet of determination EVM provided in an embodiment of the present invention method；
Fig. 7 is a kind of another schematic flow sheet of determination EVM provided in an embodiment of the present invention method；
Fig. 8 is the flow signal of a kind of determination frequency deviation, initial phase and EVM that the specific embodiment of the invention is provided method
Figure；
Fig. 9 is the schematic flow sheet of the method for the smart sync bit of determination that the specific embodiment of the invention is provided；
Figure 10 is another schematic flow sheet of the method for the smart sync bit of determination that the specific embodiment of the invention is provided；
Figure 11 is the computing schematic flow sheet that the specific embodiment of the invention is provided；
Figure 12 is a kind of structural representation of equipment for determining frequency deviation provided in an embodiment of the present invention；
Figure 13 is a kind of another structural representation of equipment for determining frequency deviation provided in an embodiment of the present invention；
Figure 14 is a kind of structural representation of equipment for determining initial phase provided in an embodiment of the present invention；
Figure 15 is a kind of structural representation of determination EVM provided in an embodiment of the present invention equipment.
Embodiment
The embodiments of the invention provide a kind of method and apparatus for determining frequency deviation, initial phase and EVM, in radio frequency one
Frequency deviation, initial phase and EVM are accurately estimated in the test of cause property, amount of calculation is reduced.
The embodiment preferential to the present invention is described in detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, a kind of method for determining frequency deviation provided in an embodiment of the present invention includes：
S101, the test signal for receiving network side, the chip for therefrom choosing predetermined number are handled, and obtain over-sampling letter
Number.
In the embodiment of the present invention, choose Q chip in the test signal of network side before current time slots, current time slots,
And L times of over-sampling data of Q chip after current time slots, root raised cosine matched filtering is carried out, then carry out LuAdopted on times
Sample processing, obtains L '=LLuThe oversampled signals r ' of times over-sampling.
S102, determine the oversampled signals and reference pilot correlation peak.
Pilot data is recovered from local DPCCH channels according to configuration information first, then L ' times are carried out to pilot data
The operation of interpolation 0, just obtains reference pilot dtx_pilot。
D is used in the prior arttx_pilotWith r ' carry out correlation value calculations, carried out again according to correlation peaks slot synchronization with
And sample timing synchronization.But there can be the problem of peak is inaccurate during due to high sampling and larger frequency deviation, have impact on
Handled further below according to correlation peaks in sampling precision, the present embodiment.
It is S103, each in the preset first range near the peak of the correlation according to the oversampled signals
Individual sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first model
Enclosing at least includes two sampled points.
According to the different sampled points of the oversampled signals of selection, L ' times of down-samplings are carried out to the oversampled signals and handled
Afterwards, multichannel is recovered without oversampled signals.The sampled point of the oversampled signals of selection is not limited to the peak of correlation,
Also including correlation peak near sampled point, be so easy to multichannel data to be compared, obtain most accurately all the way
Without oversampled signals, determined for follow-up parameter.
The specific size of first scope is determined by the frequency deviation region pre-estimated, bigger first scope of frequency deviation region
Then bigger, the first scope has included up to+1 sampled point of 2QL '.Wherein, the oversampled signals for down-sampling processing are selected
The specific method of sampled point is：Left and right respectively takes the individual sampled points of most QL ' centered on peak.S104, determination and the mistake
Each sampled point of the sampled signal in the range of first it is one-to-one without oversampled signals in average power content it is maximum all the way
Without oversampled signals
Correspond in oversampled signalsSampled point be optimum sampling timing position, also referred to as smart sync bit.
S105, according to the average power content it is maximum all the way without oversampled signals, determine Dedicated Physical Control Channel
DPCCH soft bits.
It is specifically usedDetected that (including descrambling, despreading) obtains the DPCCH soft bits d of the time slotdpcch。
S106, frequency deviation determined according to the DPCCH soft bits.
Requirement due to offset estimation to sampling timing accuracy is more relaxed, here using only basisThis way
Frequency deviation is determined according to the DPCCH soft bits recovered.
Following steps are specifically included referring to Fig. 2, S106：
S201, according to the DPCCH soft bits, determine the near-maximum-likelihood estimate of frequency deviation.Flow is as follows：
Calculate square ds of the DPCCH soft bitsdpcchIn element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined
S202, in the preset second range near the near-maximum-likelihood estimate of the frequency deviation, carry out maximum likelihood
Estimating searching, determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.Flow is as follows：
According to square ds of the DPCCH soft bitsdpcch, it is determined that using frequency deviation as the likelihood function of variable；
It is in preset second rangeIt is interior with certain step delta fstep(precision) is carried out most
Maximum-likelihood estimating searching so that the maximum frequency deviation value of likelihood function is more accurate offset estimation value, is designated as
Due to the substantial error scope for the frequency deviation that step S201 is determined, then root can be learnt according to algorithm performance and parameter
The radius Δ f of maximal possibility estimation search is determined according to the error rangeSearch, this way it is ensured that step S202 search efficiency.
Referring to Fig. 3, a kind of method for determining initial phase provided in an embodiment of the present invention includes：
S101, the test signal for receiving network side, the chip for therefrom choosing predetermined number are handled, and obtain over-sampling letter
Number；
S102, determine the oversampled signals and reference pilot correlation peak；
It is S103, each in the preset first range near the peak of the correlation according to the oversampled signals
Individual sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first model
Enclosing at least includes two sampled points；
S104, determination and each sampled point of the oversampled signals in the range of first are one-to-one without over-sampling letter
In number average power content it is maximum all the way without oversampled signals；
S105, according to the average power content it is maximum all the way without oversampled signals, determine Dedicated Physical Control Channel
DPCCH soft bits；
S106, frequency deviation determined according to the DPCCH soft bits；
S107, according to the DPCCH soft bits, and the frequency deviation, determine initial phase.
In the present embodiment, the method for determining initial phase is it is determined that being carried out on the basis of the method for frequency deviation, therefore
S101-S106 content is no longer repeated.
Herein below is specifically included referring to Fig. 4, S107：
S401, according to sign level data and the conversion relation of the initial skew of chip DBMS, use the frequency deviation
To the DPCCH soft bits ddpcchFrequency deviation compensation is carried out, data d ' is obtaineddpcch；
S402, using known pilot information to frequency deviation compensate after DPCCH soft bits in pilot portion carry out go modulation
Information is operated, and obtains including the data d " of phase informationpilot；
Include the data d " of phase information described in S403, basispilot, determine initial phase
In the present embodiment, because S107 is by using sign level data ddpcchThe estimation of chip-level initial phase is carried out,
Compared to prior art by chip-level data field estimated initial phases, amount of calculation is reduced.
As shown in figure 5, a kind of determination EVM provided in an embodiment of the present invention method includes：
S101, the test signal for receiving network side, the chip for therefrom choosing predetermined number are handled, and obtain over-sampling letter
Number；
S102, determine the oversampled signals and reference pilot correlation peak；
It is S103, each in the preset first range near the peak of the correlation according to the oversampled signals
Individual sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling processing, obtain with
Each sampled point of the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein, first model
Enclosing at least includes two sampled points；
S104, determination and each sampled point of the oversampled signals in the range of first are one-to-one without over-sampling letter
In number average power content it is maximum all the way without oversampled signals, by the road without the corresponding oversampled signals of oversampled signals
Sampled point is defined as optimum sampling timing position；
S105, according to the average power content it is maximum all the way without oversampled signals, determine Dedicated Physical Control Channel
DPCCH soft bits；
S106, frequency deviation determined according to the DPCCH soft bits；
S107, according to the DPCCH soft bits, and the frequency deviation, determine initial phase；
S108, according to optimum sampling timing position, the frequency deviation and the initial phase, determine EVM.
In the present embodiment, the method for determining EVM is it is determined that being carried out on the basis of the method for initial phase, therefore
S101-S107 content is no longer repeated.
Specifically included referring to Fig. 6, S108：
S601, determine according to the oversampled signals near the optimum sampling timing position the default 3rd in the range of it is each
The oversampled signals are carried out the down-sampling processing of identical with over-sampling processing multiple by individual sampled point, obtain with institute
State each sampled point of the oversampled signals in the range of the 3rd one-to-one without oversampled signals；Wherein, the 3rd scope
No more than described first scope.
EVM estimation generally requires multichannel and calculated without oversampled signals；Due to sample timing synchronization in the present embodiment
Accurately, therefore only need to take near optimum sampling timing position under less sampled point corresponding with Timing Synchronization precision carries out
Sampling, can reach the requirement that EVM is calculated.
S602, according in the range of the frequency deviation and the initial phase pair and the described 3rd each sampled point correspond
Carried out respectively without oversampled signals frequency deviation compensation and phase offset compensation.
S603, according to frequency deviation compensate and phase offset compensation after it is one-to-one with each sampled point in the range of the described 3rd
Without oversampled signals, EVM is determined.
Specifically included referring to Fig. 7, S603：
S701, frequency deviation compensation corresponding with the optimum sampling timing position after phase offset compensation is entered without oversampled signals all the way
Row descrambling, despreading, obtain DPDCH and DPCCH original bit；
S702, the original bit obtained according to S701 carry out data recovery (spread spectrum, scrambling and RC filtering) and referred to
Signal；
S703, respectively according to frequency deviation compensate and phase offset compensation compensation after the 3rd in the range of each sampled point it is one-to-one
Amplitude correction is carried out to reference signal without oversampled signals；
S704, calculate after frequency deviation compensation and phase offset compensation the 3rd in the range of each sampled point it is one-to-one without over-sampling
Signal and the difference of the reference signal after amplitude correction；
S705, the set for obtaining according to the mathematic interpolation EVM values, minimum value therein is defined as to EVM calculating knot
Really.
In addition, the intermediate parameters of the present embodiment constantly also can be used directly in progress other parameters test, for example, the difference
Value subsequently can also be used as the input for calculating PCDE.
Further description is made to above-described embodiment using specific application scenarios below.
As shown in figure 8, WCDMA system binary channels QPSK (Quadrature Phase Shift Keying,
QPSK) frequency deviation and the implementation steps of EVM estimations are as follows under modulation system：
S1：Signal is received, the RRC matched filterings of Q chip after Q chip and the n before current time slots n, n are taken
L times of over-sampling data afterwards, are designated as r, and wherein L is over-sampling rate, and N=2560 is the number of chips of a time slot.
S2：Carry out essence synchronous.
As shown in figure 9, S2 specifically includes step S2.1-S2.5：
S2.1：L is carried out to ruUp-sampling and filtering obtain r ' again.
S2.2：Local pilot bits are obtained into frequency pilot sign d through ovennodulationpilot, then spread and scrambled recovery DPCCH
Pilot data d on channelscr,pilot, and carried out L '=LLuThe operation of times interpolation 0 obtains reference pilot dtx_pilot。
S2.3：Use dtx_pilotWith r ' carry out correlation value calculations, R is obtainedpilot=[Rpilot(0),Rpilot(1),…,
Rpilot(Nsync- 1)], wherein Nsync=2QL '+1, to synchronize the data window length of search.
S2.4：Seek correlation peak location：
S2.5：The determination of smart sync bit.
In order to eliminate the inaccurate influence of peak caused by big frequency deviation, in addition it is also necessary to further left in peak and peak value
Right each Δ I position is searched further in I+1 position of 2 Δ totally, to obtain optimum sampling timing position；Search is only needed to
In NsyncIt is interior to carry out, therefore Δ I≤QL '.As shown in Figure 10, S2.5 specifically includes step S2.5.1-S2.5.4：
S2.5.1：To r ' carry out down-samplings, 2 Δ I+1 roads are obtained without over-sampling data：r0,r1,...,r2ΔI。
S2.5.2：Seek the mean power of every circuit-switched data：m0,m1,...,m2ΔI。
S2.5.3：Determine the maximum circuit-switched data of mean power：
S2.5.4：Smart sync bit is determined；
Optimum sampling timing position is：r′(Imax-ΔI+kopt-QL′)；The optimum sampling grouped data of current time slots is the
koptCircuit-switched data
It should be noted that because essence is synchronous very accurate, and the requirement of frequency deviation and skew estimation to timing is wider than EVM
Pine, below the S3~S5 estimation of frequency deviation and initial skew only need to use optimum sampling grouped data.
S3：Coarse frequency offset.
It is rightDescramble, de-spread to obtain DPCCH data ddpcch, then seek ddpcchSquare dsdpcch, to eliminate phase hit；
Then ds is calculateddpcchThe delay autocorrelation value R of middle element：
Then the near-maximum-likelihood estimate of frequency deviation is：
Wherein arg is the computing for seeking phase, TsIt is chip speed for DPCCH symbol period
Rate Tc256 times：Ts=256Tc.Divided by 2 operation is because the data used are squares of former data.
According to near-maximum-likelihood rule calculate, can only rough estimate frequency deviation, precision is relatively low, thus also needs to proceed
High-precision estimation.
S4：Smart offset estimation.
In the range of with certain step delta fstep(precision) carries out maximal possibility estimation
Search, S is natural number, S Δs fstepMaximum be no more than default search radius；
Likelihood function is：
Maximum is looked for obtain：kmax=argmax Λ (k)；
Then
Obtain high-precision frequency deviation.
S5：Seek chip-level initial phase.
In order to reduce amount of calculation, symbolization DBMS ddpcchCarry out the estimation of chip-level initial phase：
First byTo ddpcchCarry out symbol level frequency deviation and compensate to obtain d 'dpcchObtain edpcch, conversion is needed during compensation
The relationship factor of chip-level skew and symbol level skew
edpcch=[edpcch(0),edpcch(1),...,edpcch(Nsym- 1)],
WhereinSFdpcch=256, be DPCCH channels spread spectrum because
Son；Tc=1/3840000 is WCDMA chip periods.
Then using known pilot symbols to edpcchIn pilot portion carry out go modulation intelligence operation obtain e 'pilot：
Wherein NpilotFor time-multiplexed pilot symbolic number.
Finally according to e 'pilotThe phase information of middle residual tries to achieve chip-level initial phase
Wherein arg is to ask argument to operate.
S6：The compensation of frequency deviation and initial phase.
Here each Δ I ' roads of current time slots optimum sampling grouped data and its left and right road single-time sampling data of totally 2 Δ I '+1 are taken
Carry out frequency deviation, the compensation of initial phase respectively without oversampled signals, the i-th circuit-switched data of note is designated asAfter frequency deviation, phase offset compensation
Obtain
Because S2 synchronizing process is more accurate, Δ I ' can take smaller value, such as 0~2 here.
S7：Only to the data after optimum sampling data frequency deviation, phase offset compensationDescrambled, de-spread and hard decision is obtained
DPCCH and DPDCH original bit data.
S8：Data recovery：The DPCCH and DPDCH original bit data obtained to S7 be modulated, spread, scrambling and
RC filtering obtains reference signal rf。
S9：To reference signal rfCarry out amplitude correction.
The principle of amendment is so that revised reference signal and test signalEuclidean distance it is nearest.So obtain
I revised reference signals：
S10：Calculate EVM.
Calculate the EVM values of the road signals of 2 Δ I '+1 respectively first
I-th drive test trial signal and the difference of the reference signal of i-th of amendment are：Then
Final EVM values are：
IfThen willThe defeated of PCDE is calculated as follow-up
Enter, the offset estimation value that step S4 is obtained as final offset estimation output.
In this specific embodiment, main computing flow is summarized as shown in Figure 11.
The present invention gives a kind of simple and the high sampling timing algorithm for estimating of precision and flow, because timing accuracy is high,
So that offset estimation only can, be not required to carry out multichannel calculating using optimum sampling packet calculating, and EVM calculating is used
The data of less way, realize simply and do not lose precision.In addition, give it is a kind of simple and high precision at the beginning of
Beginning phase bias estimation.
As shown in figure 12, a kind of equipment for determining frequency deviation provided in an embodiment of the present invention, including：
Correlation peaks computing unit 1201, for the test signal for receiving network side, therefrom chooses predetermined number
Chip handled, obtain oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit 1202, for according to the oversampled signals near the peak of the correlation
Each sampled point in preset first range, and the oversampled signals over-sampling multiple, the oversampled signals are entered
Row down-sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without over-sampling letter
Number；Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit 1203, for determining to adopt with each in the range of first of the oversampled signals
Sampling point it is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit 1204, for according to the average power content it is maximum all the way without oversampled signals, it is determined that
Special used for physical control channel DPCCH soft bit；
Frequency deviation determining unit 1205, for determining frequency deviation according to the DPCCH soft bits.
Preferably, referring to Figure 13, the frequency deviation determining unit 1205, including：
Thick frequency deviation determining unit 1301, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimation of frequency deviation
Value；
Smart frequency deviation determining unit 1302, for default second model near the near-maximum-likelihood estimate of the frequency deviation
In enclosing, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
The thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
Preferably, the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
As shown in figure 14, a kind of equipment for determining initial phase provided in an embodiment of the present invention, including：
Correlation peaks computing unit 1201, the test signal for receiving network side therefrom chooses the code of predetermined number
Piece is handled, and obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit 1202, for according to the oversampled signals near the peak of the correlation
Each sampled point in preset first range, and the oversampled signals over-sampling multiple, the oversampled signals are entered
Row down-sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without over-sampling letter
Number；Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit 1203, for determining to adopt with each in the range of first of the oversampled signals
Sampling point it is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit 1204, for according to the average power content it is maximum all the way without oversampled signals, it is determined that
Special used for physical control channel DPCCH soft bit；
Frequency deviation determining unit 1205, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit 1206, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase
Position.
Preferably, the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, for the preset second range near the near-maximum-likelihood estimate of the frequency deviation
It is interior, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
Preferably, the thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
Preferably, the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
Preferably, the initial phase determining unit, specifically for：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
As shown in figure 15, a kind of equipment for determining error vector magnitude EVM provided in an embodiment of the present invention includes：
Correlation peaks computing unit 1201, the test signal for receiving network side therefrom chooses the code of predetermined number
Piece is handled, and obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit 1202, for according to the oversampled signals near the peak of the correlation
Each sampled point in preset first range, and the oversampled signals over-sampling multiple, the oversampled signals are entered
Row down-sampling processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without over-sampling letter
Number；Wherein, first scope at least includes two sampled points；
Without oversampled signals selecting unit 1203, for determining to adopt with each in the range of first of the oversampled signals
Sampling point it is one-to-one without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit 1204, for according to the average power content it is maximum all the way without oversampled signals, it is determined that
Special used for physical control channel DPCCH soft bit；
Frequency deviation determining unit 1205, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit 1206, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase
Position；
EVM determining units 1207, for according to optimum sampling timing position, the frequency deviation and the initial phase, really
Determine EVM.
Preferably, the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, for the preset second range near the near-maximum-likelihood estimate of the frequency deviation
It is interior, maximal possibility estimation search is carried out, frequency deviation is determined；Wherein, second scope is determined according to the error range of frequency deviation.
Preferably, the thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
Preferably, the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused
The variable-value of maximum is taken to be defined as frequency deviation.
Preferably, the initial phase determining unit, specifically for：
According to sign level data and the conversion relation of the initial skew of chip DBMS, using the frequency deviation to described
DPCCH soft bits carry out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to grasp
Make, obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
Preferably, the EVM determining units, specifically for：
It is determined that according to the oversampled signals near the optimum sampling timing position the default 3rd in the range of each adopt
The oversampled signals are carried out the down-sampling processing of identical with over-sampling processing multiple by sampling point, obtaining with the mistake
Each sampled point of the sampled signal in the range of the 3rd is one-to-one without oversampled signals；Wherein, the 3rd scope is little
In first scope；
According to the one-to-one nothing of each sampled point in the range of the frequency deviation and the initial phase pair and the described 3rd
Oversampled signals carry out frequency deviation compensation and phase offset compensation respectively；
According to frequency deviation compensate and phase offset compensation after with the described 3rd in the range of each sampled point correspondingly without mistake
Sampled signal, determines EVM.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The shape for the computer program product that usable storage medium is implemented on (including but is not limited to magnetic disk storage and optical memory etc.)
Formula.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (30)
1. a kind of method for determining frequency deviation, it is characterised in that this method includes：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
According to each sampled point of the oversampled signals in the preset first range near the peak of the correlation,
And the over-sampling multiple of the oversampled signals, down-sampling processing is carried out to the oversampled signals, obtains adopting with the mistake
Each sampled point of the sample signal in the range of first is one-to-one without oversampled signals；Wherein, first scope is at least wrapped
Include two sampled points；
It is determined that with each sampled point of the oversampled signals in the range of first it is one-to-one without oversampled signals in it is average
Performance number it is maximum all the way without oversampled signals；
According to average power content maximum all the way without oversampled signals, special used for physical control channel DPCCH soft bit is determined；
Frequency deviation is determined according to the DPCCH soft bits.
2. the method as described in claim 1, it is characterised in that frequency deviation is determined according to the DPCCH soft bits, including：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, maximal possibility estimation search is carried out,
Determine frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
3. method as claimed in claim 2, it is characterised in that according to the DPCCH soft bits, determine the approximate maximum of frequency deviation
Likelihood estimator, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
4. method as claimed in claim 2, it is characterised in that pre- near the near-maximum-likelihood estimate of the frequency deviation
If in the range of second, maximal possibility estimation search is carried out, frequency deviation is determined, including：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
5. a kind of method for determining initial phase, it is characterised in that this method includes：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
According to each sampled point of the oversampled signals in the preset first range near the peak of the correlation,
And the over-sampling multiple of the oversampled signals, down-sampling processing is carried out to the oversampled signals, obtains adopting with the mistake
Each sampled point of the sample signal in the range of first is one-to-one without oversampled signals；Wherein, first scope is at least wrapped
Include two sampled points；
It is determined that with each sampled point of the oversampled signals in the range of first it is one-to-one without oversampled signals in it is average
Performance number it is maximum all the way without oversampled signals；
According to average power content maximum all the way without oversampled signals, special used for physical control channel DPCCH soft bit is determined；
Frequency deviation is determined according to the DPCCH soft bits；
According to the DPCCH soft bits, and the frequency deviation, initial phase is determined.
6. method as claimed in claim 5, it is characterised in that frequency deviation is determined according to the DPCCH soft bits, including：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, maximal possibility estimation search is carried out,
Determine frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
7. method as claimed in claim 6, it is characterised in that according to the DPCCH soft bits, determine the approximate maximum of frequency deviation
Likelihood estimator, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
8. method as claimed in claim 6, it is characterised in that pre- near the near-maximum-likelihood estimate of the frequency deviation
If in the range of second, maximal possibility estimation search is carried out, frequency deviation is determined, including：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
9. method as claimed in claim 5, it is characterised in that according to the DPCCH soft bits, and the frequency deviation, it is determined that
Initial phase, including：
It is soft to the DPCCH using the frequency deviation according to sign level data and the conversion relation of the initial skew of chip DBMS
Bit carries out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to operate,
Obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
10. a kind of method for determining error vector magnitude EVM, it is characterised in that this method includes：
The test signal of network side is received, the chip for therefrom choosing predetermined number is handled, and obtains oversampled signals；
Determine the peak of the correlation of the oversampled signals and reference pilot；
According to each sampled point of the oversampled signals in the preset first range near the peak of the correlation,
And the over-sampling multiple of the oversampled signals, down-sampling processing is carried out to the oversampled signals, obtains adopting with the mistake
Each sampled point of the sample signal in the range of first is one-to-one without oversampled signals；Wherein, first scope is at least wrapped
Include two sampled points；
It is determined that with each sampled point of the oversampled signals in the range of first it is one-to-one without oversampled signals in it is average
Performance number it is maximum all the way without oversampled signals, sampled point of the road without the corresponding oversampled signals of oversampled signals is true
It is set to optimum sampling timing position；
According to average power content maximum all the way without oversampled signals, special used for physical control channel DPCCH soft bit is determined；
Frequency deviation is determined according to the DPCCH soft bits；
According to the DPCCH soft bits, and the frequency deviation, initial phase is determined；
According to optimum sampling timing position, the frequency deviation and the initial phase, EVM is determined.
11. method as claimed in claim 10, it is characterised in that frequency deviation is determined according to the DPCCH soft bits, including：
According to the DPCCH soft bits, the near-maximum-likelihood estimate of frequency deviation is determined；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, maximal possibility estimation search is carried out,
Determine frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
12. method as claimed in claim 11, it is characterised in that according to the DPCCH soft bits, determine frequency deviation it is approximate most
Maximum-likelihood estimate, including：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
13. method as claimed in claim 11, it is characterised in that near the near-maximum-likelihood estimate of the frequency deviation
In preset second range, maximal possibility estimation search is carried out, frequency deviation is determined, including：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
14. method as claimed in claim 10, it is characterised in that according to the DPCCH soft bits, and the frequency deviation, really
Determine initial phase, including：
It is soft to the DPCCH using the frequency deviation according to sign level data and the conversion relation of the initial skew of chip DBMS
Bit carries out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to operate,
Obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
15. method as claimed in claim 10, it is characterised in that according to optimum sampling timing position, the frequency deviation, Yi Jisuo
Initial phase is stated, EVM is determined, including：
It is determined that each sampled point preset in the range of the 3rd according to the oversampled signals near optimum sampling timing position,
The oversampled signals are carried out with the down-sampling processing of multiple identical with the over-sampling processing, what is obtained believes with the over-sampling
Each sampled point number in the range of the 3rd is one-to-one without oversampled signals；Wherein, the 3rd scope is not more than described
First scope；
Adopted according to each sampled point in the range of the frequency deviation and the initial phase pair and the described 3rd is one-to-one without mistake
Sample signal carries out frequency deviation compensation and phase offset compensation respectively；
According to frequency deviation compensate and phase offset compensation after with the described 3rd in the range of each sampled point correspondingly without over-sampling
Signal, determines EVM.
16. a kind of equipment for determining frequency deviation, it is characterised in that the equipment includes：
At correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number
Reason, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for presetting first near the peak of the correlation according to the oversampled signals
In the range of each sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling
Processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein,
First scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining with each sampled point of the oversampled signals in the range of first one by one
It is corresponding without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, determining special physics according to average power content maximum
Control channel DPCCH soft bits；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits.
17. equipment as claimed in claim 16, it is characterised in that the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, in the preset second range near the near-maximum-likelihood estimate of the frequency deviation, entering
Row maximal possibility estimation is searched for, and determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
18. equipment as claimed in claim 17, it is characterised in that the thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
19. equipment as claimed in claim 17, it is characterised in that the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
20. a kind of equipment for determining initial phase, it is characterised in that the equipment includes：
At correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number
Reason, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for presetting first near the peak of the correlation according to the oversampled signals
In the range of each sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling
Processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein,
First scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining with each sampled point of the oversampled signals in the range of first one by one
It is corresponding without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, determining special physics according to average power content maximum
Control channel DPCCH soft bits；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase.
21. equipment as claimed in claim 20, it is characterised in that the frequency deviation determining unit, including：Thick frequency deviation determines single
Member, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, in the preset second range near the near-maximum-likelihood estimate of the frequency deviation, entering
Row maximal possibility estimation is searched for, and determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
22. equipment as claimed in claim 21, it is characterised in that the thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
23. equipment as claimed in claim 21, it is characterised in that the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
24. equipment as claimed in claim 20, it is characterised in that the initial phase determining unit, specifically for：
It is soft to the DPCCH using the frequency deviation according to sign level data and the conversion relation of the initial skew of chip DBMS
Bit carries out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to operate,
Obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
25. a kind of equipment for determining error vector magnitude EVM, it is characterised in that the equipment includes：
At correlation peaks computing unit, the test signal for receiving network side, the chip for therefrom choosing predetermined number
Reason, obtains oversampled signals；Determine the peak of the correlation of the oversampled signals and reference pilot；
Down-sampling processing unit, for presetting first near the peak of the correlation according to the oversampled signals
In the range of each sampled point, and the oversampled signals over-sampling multiple, to the oversampled signals carry out down-sampling
Processing, each sampled point obtained with the oversampled signals in the range of first is one-to-one without oversampled signals；Wherein,
First scope at least includes two sampled points；
Without oversampled signals selecting unit, for determining with each sampled point of the oversampled signals in the range of first one by one
It is corresponding without average power content in oversampled signals it is maximum all the way without oversampled signals；
Soft bit determining unit, for, all the way without oversampled signals, determining special physics according to average power content maximum
Control channel DPCCH soft bits；
Frequency deviation determining unit, for determining frequency deviation according to the DPCCH soft bits；
Initial phase determining unit, for according to the DPCCH soft bits, and the frequency deviation, determining initial phase；
EVM determining units, for according to optimum sampling timing position, the frequency deviation and the initial phase, determining EVM.
26. equipment as claimed in claim 25, it is characterised in that the frequency deviation determining unit, including：
Thick frequency deviation determining unit, for according to the DPCCH soft bits, determining the near-maximum-likelihood estimate of frequency deviation；
Smart frequency deviation determining unit, in the preset second range near the near-maximum-likelihood estimate of the frequency deviation, entering
Row maximal possibility estimation is searched for, and determines frequency deviation；Wherein, second scope is determined according to the error range of frequency deviation.
27. equipment as claimed in claim 26, it is characterised in that the thick frequency deviation determining unit specifically for：
Calculate the DPCCH soft bits square in element delay autocorrelation value；
According to the delay autocorrelation value, the near-maximum-likelihood estimate of frequency deviation is determined.
28. equipment as claimed in claim 26, it is characterised in that the smart frequency deviation determining unit specifically for：
According to square of the DPCCH soft bits, it is determined that using frequency deviation as the likelihood function of variable；
In the preset second range near the near-maximum-likelihood estimate of the frequency deviation, the likelihood function will be caused to take most
The variable-value being worth greatly is defined as frequency deviation.
29. equipment as claimed in claim 25, it is characterised in that the initial phase determining unit, specifically for：
It is soft to the DPCCH using the frequency deviation according to sign level data and the conversion relation of the initial skew of chip DBMS
Bit carries out frequency deviation compensation；
The pilot portion in DPCCH soft bits after being compensated using known pilot information frequency deviation carries out going modulation intelligence to operate,
Obtain including the data of phase information；
According to the data for including phase information, initial phase is determined.
30. equipment as claimed in claim 25, it is characterised in that the EVM determining units, specifically for：
It is determined that each sampled point preset in the range of the 3rd according to the oversampled signals near optimum sampling timing position,
The oversampled signals are carried out with the down-sampling processing of multiple identical with the over-sampling processing, what is obtained believes with the over-sampling
Each sampled point number in the range of the 3rd is one-to-one without oversampled signals；Wherein, the 3rd scope is not more than described
First scope；
Adopted according to each sampled point in the range of the frequency deviation and the initial phase pair and the described 3rd is one-to-one without mistake
Sample signal carries out frequency deviation compensation and phase offset compensation respectively；
According to frequency deviation compensate and phase offset compensation after with the described 3rd in the range of each sampled point correspondingly without over-sampling
Signal, determines EVM.
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| CN110445679B (en) * | 2019-07-26 | 2020-06-26 | 南京大鱼半导体有限公司 | Communication test method, device, storage medium and electronic equipment |
| CN112765547A (en) * | 2021-01-13 | 2021-05-07 | 北京合众思壮科技股份有限公司 | Phase information acquisition method and device, electronic equipment and storage medium |
| CN113156467B (en) * | 2021-02-24 | 2022-10-11 | 北京科电航宇空间技术有限公司 | Common-frequency cancellation method for communication signals in satellite signal positioning |
| CN114070685B (en) * | 2021-11-01 | 2023-12-08 | 泰凌微电子(上海)股份有限公司 | Frequency offset estimation method and device |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210602 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |