CN109768852A - The method, apparatus and storage medium of accurate sign synchronization processing are realized based on computer software - Google Patents
The method, apparatus and storage medium of accurate sign synchronization processing are realized based on computer software Download PDFInfo
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Abstract
The invention further relates to a kind of methods for realizing accurate sign synchronization processing based on computer software, the following steps are included: (1) acquires initial data by analog-digital converter, and the sample rate of initial data is converted to based on Lagrange's interpolation by 4 times of character rates by computer；(2) timing error of two neighboring sampled point is calculated；(3) the phase P in present sample sequence relative signs period is calculatedr；(4) pass through accurate 0 error position of linear fit；(5) it is fitted to obtain symbolic point by Lagrange's interpolation.Using the method for the invention for realizing accurate sign synchronization processing based on computer software, sign synchronization algorithm is realized, any sample rate is realized using Lagrange's interpolation algorithm and converts, realize the estimation to timing error.The present invention is suitable for the sign synchronization of optional sign rate, can quickly recover symbol sebolic addressing, and operand is smaller, and precision is high, includes the equipment of computer disposal platform especially suitable for Vector Signal Analyzer etc..
Description
Technical field
The present invention relates to technology of instrument and meter fields more particularly to Vector Signal Analyzer base band data Processing Algorithm to lead
Domain, in particular to a kind of method that accurate sign synchronization processing is realized based on computer software.
Background technique
In the research and development and test process of wireless telecom equipment, Vector Signal Analyzer is that the essential auxiliary of one kind is set
Standby, it can analyze signal in real time, efficiently easily measure relevant technical indicator.Vector signal point as shown in Figure 1
Analyzer brief configuration figure after signal receives input by radio circuit, is digital signal by ADC sample conversion, will count by FPGA
According in incoming computer, data are analyzed and processed by computer software.
When analyzer analyzes orthogonal demodulation signal, needs to carry out sign synchronization to collected data, be connect with recovering
Code element information in the collection of letters number.For common wireless signals reception equipment, the process of sign synchronization is generally in baseband hardware
It realizes, but hardware can only support communication standard preset, specific then to have one for signal analyzer
Fixed universality is wanted various common signals be analyzed and be handled, at this time again by baseband hardware carry out data decoding,
Analysis will become very inefficient, and expend resource.Thus needing will be including the data handling procedure including " sign synchronization "
It is put on computer software and carries out.
Algorithm based on baseband hardware is realized and the algorithm realization based on computer software has very big difference.Based on hard
The data processing structure of assembly line may be implemented in part, is handled incessantly the continuous data sequence of endless, with often
The use of calculating logic is often reduced with the structure of feedback.And the algorithm based on computer software usually divides data
Section processing, handles one section of time-limited continuous data on the whole, although the speed of data processing is slower than dedicated hard
Part logic, but higher precision may be implemented in computer, while facilitating debugging and modification.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provide that a kind of operand is appropriate, executes speed
Fastly, facilitate the method that accurate sign synchronization processing is realized based on computer software that debugging is modified.
To achieve the goals above, the method for the invention that accurate sign synchronization processing is realized based on computer software
It is as follows:
The method for realizing accurate sign synchronization processing based on computer software, is mainly characterized by, the side
Method the following steps are included:
(1) initial data is acquired by analog-digital converter, and Lagrange's interpolation is utilized based on computer software
The sample rate of initial data is converted into 4 times of character rates；
(2) timing error of two neighboring sampled point is calculated by Gardner algorithm；
(3) the phase P in present sample sequence relative signs period is calculatedr；
(4) pass through accurate 0 error position of linear fit；
(5) it is fitted to obtain symbolic point by Lagrange's interpolation.
Preferably, the step (2) specifically includes the following steps:
(2.1) timing error is estimated by Gardner algorithm；
(2.2) timing error of two neighboring phase is calculated.
Preferably, the step (4) specifically includes the following steps:
(4.1) in PrPoint two sides carry out the sample rate conversion of 2 times of character rates, and estimate timing error eCAnd eD；
(4.2) linear fit is calculated by the timing error, and finds out accurate 0 error phase.
Preferably, sample rate is converted by Lagrange's interpolation in the step (1), specifically:
Sample rate is converted by Lagrange's interpolation according to the following formula:
Wherein, n is interpolation referring to a number, and x is original series, and t is that each point corresponds to moment sequence.
Preferably, timing error is estimated in the step (2.1), specifically:
Timing error is estimated according to the following formula:
Wherein, I, Q are two-way symbol, and the index of n I, Q two-way symbol, s (n) is current sign sampled point, and s (n-1) is
The sampled point at moment before one symbol period,For the sampled point at moment before half symbol period.
Preferably, the timing error of two neighboring phase is calculated in the step (2.2), specifically:
The timing error of two neighboring phase is calculated according to the following formula:
Wherein, I, Q are two-way symbol, eA、eBThe timing error of 90 ° of phase two o'clocks is respectively differed, y is that sample rate is 4 times
The data sequence of character rate, i={ 0,1,2 ... ... } are the index of data sequence y.
Preferably, the phase in present sample sequence relative signs period is calculated in the step (3), specifically:
The phase in present sample sequence relative signs period is calculated according to the following formula:
Wherein, eA、eBRespectively differ the timing error of 90 ° of phase two o'clocks.
Preferably, accurate 0 error phase in the step (4.2), specifically:
Accurate 0 error phase according to the following formula:
This realizes the device of accurate sign synchronization processing based on computer software, which is characterized in that the device
Including the memory for storing program and the processor for executing the program, to support described in realization based on
The method that calculation machine software systems realize accurate sign synchronization processing.
The computer readable storage medium, which is characterized in that including program, the program can be executed by processor to prop up
It holds and completes the method that accurate sign synchronization processing is realized based on computer software.
Using the method for the invention for realizing accurate sign synchronization processing based on computer software, symbol is realized
Synchronized algorithm is realized any sample rate using Lagrange's interpolation algorithm and converted, realized to timing accidentally using Gardner algorithm
The estimation of difference.The present invention is suitable for the sign synchronization of optional sign rate, can quickly recover symbol sebolic addressing, and operand is smaller,
Precision is high.It include the equipment of computer disposal platform especially suitable for Vector Signal Analyzer etc..
Detailed description of the invention
Fig. 1 is the composition block diagram of the Vector Signal Analyzer of the prior art.
Fig. 2 is the flow chart of the method for the invention that accurate sign synchronization processing is realized based on computer software.
Fig. 3 is the survey of the embodiment of the method for the invention that accurate sign synchronization processing is realized based on computer software
Test result figure.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
The method that accurate sign synchronization processing should be realized based on computer software of the invention, including:
(1) initial data is acquired by analog-digital converter, and Lagrange's interpolation is utilized based on computer software
The sample rate of initial data is converted into 4 times of character rates；
(2) timing error of two neighboring sampled point is calculated by Gardner algorithm；
(2.1) timing error is estimated by Gardner algorithm；
(2.2) timing error of two neighboring phase is calculated；
(3) the phase P in present sample sequence relative signs period is calculatedr；
(4) pass through accurate 0 error position of linear fit；
(4.1) in PrPoint two sides carry out the sample rate conversion of 2 times of character rates, and estimate timing error eCAnd eD；
(4.2) linear fit is calculated by the timing error, and finds out accurate 0 error phase；
(5) it is fitted to obtain symbolic point by Lagrange's interpolation.
As the preferred embodiment of the present invention, sample rate is converted by Lagrange's interpolation in the step (1),
Specifically:
Sample rate is converted by Lagrange's interpolation according to the following formula:
Wherein, n is interpolation referring to a number, and x is original series, and t is that each point corresponds to moment sequence.
As the preferred embodiment of the present invention, timing error is estimated in the step (2.1), specifically:
Timing error is estimated according to the following formula:
Wherein, I, Q are two-way symbol, and the index of n I, Q two-way symbol, s (n) is current sign sampled point, and s (n-1) is
The sampled point at moment before one symbol period,For the sampled point at moment before half symbol period.
As the preferred embodiment of the present invention, the timing error of two neighboring phase is calculated in the step (2.2),
Specifically:
The timing error of two neighboring phase is calculated according to the following formula:
Wherein, I, Q are two-way symbol, eA、eBThe timing error of 90 ° of phase two o'clocks is respectively differed, y is that sample rate is 4 times
The data sequence of character rate, i={ 0,1,2 ... ... } are the index of data sequence y.
As the preferred embodiment of the present invention, the present sample sequence relative signs period is calculated in the step (3)
Phase, specifically:
The phase in present sample sequence relative signs period is calculated according to the following formula:
Wherein, eA、eBRespectively differ the timing error of 90 ° of phase two o'clocks.
As the preferred embodiment of the present invention, accurate 0 error phase in the step (4.2), specifically:
Accurate 0 error phase according to the following formula:
The device that accurate sign synchronization processing should be realized based on computer software of the invention, which is characterized in that institute
The device stated includes the memory for storing program and the processor for executing the program, described in supporting to realize
The method that the processing of accurate sign synchronization is realized based on computer software.
Computer readable storage medium of the invention, which is characterized in that including program, the program can be by processor
It executes to support to complete the method for realizing accurate sign synchronization processing based on computer software.
In a specific embodiment of the invention, it is illustrated in figure 2 the outline flowchart of inventive algorithm, is primarily based on glug
Bright day interpolation method carries out sample rate conversion to initial data, 4 times of character rate data is converted to, relative to a complete symbol
Period, the adjacent two o'clock of translated data differ 90 ° of symbol phase.
The average timing error that two neighboring sampled point is calculated followed by Gardner algorithm, due in sampled data
Each symbol is continuously distributed and the period is equal, thus timing error changes over time into sinusoidal relationship, thus utilizes
The timing error value of two 90 ° of the differences arrived, at the time of the position, i.e. symbolic point of 0 timing error can be released roughly.
Due to timing error be in sinusoidal changing rule, 0 error dot position nearby can approximation be regarded as straight line, just
Two points are chosen as start-phase in the 0 error dot two sides acquired, and carry out the sample rate conversion of 2 times of character rates, obtain two groups
Data simultaneously calculate timing error with this, obtain two groups of timing error data.
Then linear fit is done using obtained timing error, solves accurate 0 timing error position.Finally, utilizing
Lagrange's interpolation fits the point directly to get corresponding symbol data is arrived.
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The present invention is based on computer softwares to realize accurate sign synchronization algorithm.Initial data is collected by ADC, sampling
Rate is determined by hardware configuration, it is assumed that sample rate ssamp, continuous for one group, time-limited original series are labeled as Xorig
={ x0, x1, x2 ... ..., xn }, each sampled point corresponds to the equally spaced moment, it is assumed that each point corresponds to moment sequence and is
4 times of character rates are converted to firstly the need of by the sample rate of initial data, it is assumed that the character rate of current data is
Ssymb, then each sampled data points correspond to the moment after convertingIt will be former
Beginning data sequence Xorig and corresponding time series Torig substitute into Lagrange's interpolation formula:
Wherein n is interpolation referring to a number, to guarantee that the smallest interpolation error, timeinstant should be chosen at each reference
Point is intermediate.
Thus successively acquire the value that Tinter corresponds to each moment, finally obtain data sequence Y=y0, y1, y2 ... ...,
Yn }, notice that Y is the complex valued signals comprising real part (I) component and imaginary part (Q) component, calculates timing error using this sequence later,
According to Gardner timing error estimating algorithm:
Indicated number n indicates that the index of I, Q two-way symbol, s (n) indicate that current sign sampled point, s (n-1) indicate a symbol
The sampled point at moment before number period,The sampled point at moment before expression half symbol period.For sampling
Rate is the data sequence Y of 4 times of character rates, and each sampled point interval a quarter symbol period calculates two neighboring phase
Timing error:
Wherein i={ 0,1,2 ... } is the index of data sequence Y, the e being calculatedA、eBIt is 90 ° of phase two o'clocks of difference
Timing error can directly calculate eAThe symbol phase at corresponding moment, the i.e. phase in present sample sequence relative signs period:
Since the variation of actual signal is more complex, phase P is thus obtainedrIt is still inaccurate, in order to realize that accurate symbol is same
Step, close to PrTwo P side-drawr+ π/50 and PrThe two o'clock of-π/50 does glug on the basis of initial data Xorig as initial phase
Bright day interpolation, is converted to the sample rate of 2 times of character rates, after obtaining two groups of data sequences, estimates timing error respectively, obtains eC
And eD, due to timing error with symbol phase at sinusoidal variation, near the phase that timing error is 0, can approximation be regarded as
Timing error changes with phase linearity, utilizes eCAnd EDTwo o'clock does linear fit, obtains accurate phase:
Utilize PaAt the time of available each symbolic point
Lagrange's interpolation formula is substituted into again, finally obtains the value S={ s0, s1, s2 ... ... } of each symbolic point.
Algorithm measured result figure as shown in Figure 3, using algorithm process 245.76MHz sample rate, character rate
The QPSK modulation data of 100MHz, background grey black color dot is initial data in Fig. 3, calculates by algorithm above, rules out figure
The symbolic point of upper red, it is seen that the algorithm preferably realizes the operation of sign synchronization.
Using the method for the invention for realizing accurate sign synchronization processing based on computer software, symbol is realized
Synchronized algorithm is realized any sample rate using Lagrange's interpolation algorithm and converted, realized to timing accidentally using Gardner algorithm
The estimation of difference.The present invention is suitable for the sign synchronization of optional sign rate, can quickly recover symbol sebolic addressing, and operand is smaller,
Precision is high.It include the equipment of computer disposal platform especially suitable for Vector Signal Analyzer etc..
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (10)
1. a kind of method for realizing accurate sign synchronization processing based on computer software, which is characterized in that the method
The following steps are included:
(1) initial data is acquired by analog-digital converter, and will be former using Lagrange's interpolation based on computer software
The sample rate of beginning data is converted to 4 times of character rates；
(2) timing error of two neighboring sampled point is calculated by Gardner algorithm；
(3) the phase P in present sample sequence relative signs period is calculatedr；
(4) pass through accurate 0 error position of linear fit；
(5) it is fitted to obtain symbolic point by Lagrange's interpolation.
2. the method according to claim 1 for realizing accurate sign synchronization processing based on computer software, feature
Be, the step (2) specifically includes the following steps:
(2.1) timing error is estimated by Gardner algorithm；
(2.2) timing error of two neighboring phase is calculated.
3. the method according to claim 1 for realizing accurate sign synchronization processing based on computer software, feature
Be, the step (4) specifically includes the following steps:
(4.1) in PrPoint two sides carry out the sample rate conversion of 2 times of character rates, and estimate timing error eCAnd eD；
(4.2) linear fit is calculated by the timing error, and finds out accurate 0 error phase.
4. the method according to claim 1 for realizing accurate sign synchronization processing based on computer software, feature
It is, sample rate is converted by Lagrange's interpolation in the step (1), specifically:
Sample rate is converted by Lagrange's interpolation according to the following formula:
Wherein, n is interpolation referring to a number, and x is original series, and t is that each point corresponds to moment sequence.
5. the method according to claim 2 for realizing accurate sign synchronization processing based on computer software, feature
It is, timing error is estimated in the step (2.1), specifically:
Timing error is estimated according to the following formula:
Wherein, I, Q are two-way symbol, and the index of n I, Q two-way symbol, s (n) is current sign sampled point, and s (n-1) is one
The sampled point at moment before symbol period,For the sampled point at moment before half symbol period.
6. the method according to claim 2 for realizing accurate sign synchronization processing based on computer software, feature
It is, the timing error of two neighboring phase is calculated in the step (2.2), specifically:
The timing error of two neighboring phase is calculated according to the following formula:
Wherein, I, Q are two-way symbol, eA、eBThe timing error of 90 ° of phase two o'clocks is respectively differed, y is that sample rate is 4 times of symbols
The data sequence of rate, i={ 0,1,2 ... ... } are the index of data sequence y.
7. the method according to claim 1 for realizing accurate sign synchronization processing based on computer software, feature
It is, the phase in present sample sequence relative signs period is calculated in the step (3), specifically:
The phase in present sample sequence relative signs period is calculated according to the following formula:
Wherein, eA、eBRespectively differ the timing error of 90 ° of phase two o'clocks.
8. the method according to claim 3 for realizing accurate sign synchronization processing based on computer software, feature
It is, accurate 0 error phase in the step (4.2), specifically:
Accurate 0 error phase according to the following formula:
9. a kind of device for realizing accurate sign synchronization processing based on computer software, which is characterized in that the device
Including the memory for storing program and the processor for executing the program, to support to realize claim 1 to 8
Any one of described in the method that the processing of accurate sign synchronization is realized based on computer software.
10. a kind of computer readable storage medium, which is characterized in that including program, the program can be executed by processor with
It supports to complete the side described in any item of the claim 1 to 8 for realizing accurate sign synchronization processing based on computer software
Method.
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