CN103414523A - Method for measuring modulation quality parameters based on software radio technology and system - Google Patents
Method for measuring modulation quality parameters based on software radio technology and system Download PDFInfo
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Abstract
The invention discloses a method for measuring modulation quality parameters based on software radio technology and a system. According to the invention, an original time-domain signal with no demodulation and filtering is acquired through a sampling device, and a sampling value sequence is inputted into a general purpose computation device. In the general purpose computation device, a software analysis module, which corresponds to the communication standard and is used for measuring the modulation quality parameters, is used for executing a digital signal processing algorithm premade by a program to process the sampling value sequence that the sampling device outputs so that modulation quality parameter results of the measured signal are obtained. Based on the same test platform, the method for measuring the modulation quality parameters based on software radio technology and the system are capable of achieving measurement of modulation quality parameters of various different communication standards, can extend the functions of existing equipment, reduce measurement costs and improve measurement capability, and help to improve the measuring accuracy of the modulation quality parameters.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of measurement method of parameters of modulation quality based on software and radio technique and system.
Background technology
Mobile communication technology is the most widely used information technology with fastest developing speed in the world today.For meeting different communication requirements, multiple communication standard has appearred.The modulation quality parameter is for the quality that reflects signal of communication the error rate that directly determines communication system, and therefore in the measurement of the signal of communication to various mobile communication standards, the modulation quality parameter is all the emphasis of metering testing.
The demodulation of traditional digital modulation signals is all to complete with special-purpose demodulation chip, but this way causes the treatable signal type of system institute more single, lacks flexibility.As can be known by the comparative analysis to the distinct communication standards signal, the main distinction of distinct communication standards is on coding, filtering, channelizing, Digital Signal Processing (DSP) process and modulation system, and for various signals of communication, its hardware of realizing that signal produces and analyzes there is no too large difference.For example, 3-G (Generation Three mobile communication system) and even the 4th Generation Mobile Communication System, the Focal point and difficult point of its design is in the design to signal processings such as coding, filtering, channelizings.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of measurement method of parameters of modulation quality based on software and radio technique and system, for solving existing modulation quality measurement method of parameters very flexible, specificity is strong, is difficult for the technical problem that measuring process and Measurement Algorithm are controlled and adjusted.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of measurement method of parameters of modulation quality based on software and radio technique, be applied to comprise in the measuring system of sample devices, universal computing device formation, and the method comprises:
By the original time-domain signal that sample devices is processed unmodulated, filtering, sample, obtain the sampled value sequence of original time-domain signal;
On universal computing device, load corresponding to tested communication standard measuring the software analysis module of modulation quality parameter, this software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and output is for reflecting the modulation quality parameter of measured signal modulation quality.
Further, described software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and the step of the modulation quality parameter of the tested wireless signal of output specifically comprises:
Call the pretreatment software module, the sampled value sequence of sample devices output is carried out to the preprocessing process opposite with modulated process, obtain restoring signal;
Call modulation quality parameter measurement software module, based on the restoring signal of pretreatment software module output, carry out modulation quality parameter measurement process, obtain the modulation quality parameter of measured signal.
Further, described preprocessing process is to carry out with modulated terminal the processing procedure that processing procedure is opposite, comprises one or more in waveform reconstruction, deletion header signal, resampling, demodulation.
Further, described tested communication standard is Bluetooth protocol, and described modulation quality parameter is frequency modulation, and described method is specially:
Use spectrum analyzer to sample to Bluetooth signal, the sampled value sequence of the original time-domain signal of output I/Q value form;
On universal computing device, load software analysis module corresponding to bluetooth standard, this software analysis module is processed the sampled value sequence of frequency spectrograph output by carrying out the prefabricated digital signal processing algorithm by the program realization, the frequency modulation of the tested Bluetooth signal modulation quality of output reflection.
Further, described software analysis module is carried out the described prefabricated digital signal processing algorithm by the program realization sampled value sequence of frequency spectrograph output is processed, and the step of the frequency modulation of the tested Bluetooth signal modulation quality of output reflection is specially:
The sampled value of the original time-domain signal of the I/Q value form of described frequency spectrograph output is converted into to plural form Z=A*Cos (Δ f*t+ φ)+i*A*Sin (Δ f*t+ φ), the amplitude of A representation signal wherein, Δ f means the frequency modulation to signal, the phase place of the baseband signal that the φ representative is corresponding with sampling instant;
The sampled value of plural form is converted into to polar form Z=A*exp (i Δ f*t+ φ);
By be divided by rear extraction business's phase value of the polar coordinates expression formula of two sampled points, this phase value is the phase difference Φ 2-Φ 1 of the baseband signal between two sampled points;
According to Δ f=(Φ 2-Φ 1)/[2 π * (t
2-t
1)] calculate frequency modulation Δ f, wherein t1 and t2 are respectively two sampling instant Φ 1 and Φ 2 phase place for the baseband signal corresponding with sampling instant.
Further, described software analysis module, before the described prefabricated digital signal processing algorithm of being realized by program of execution is processed the sampled value sequence of frequency spectrograph output, is also carried out following preprocessing process:
By rebuilding waveform module, will become plural array from the sampled value sequence of expressing with character string forms that frequency spectrograph is adopted, the I/Q amplitude of corresponding each sampled point of the element in array; For each sampled point adds temporal information, generate the time domain waveform array, the element in array is corresponding one by one with sampled point;
By deleting the header signal module, the header information of packets of information is deleted, namely delete Partial Elements corresponding to header information in the time domain waveform array;
By the resampling module, the time domain waveform array of deleting header information is carried out to the speed adjustment, to meet the rate requirement of FSK demodulation module;
By the FSK demodulation module, the time domain waveform array of carrying out after the speed adjustment is processed, realized carrier synchronization and bit synchronization, the output restoring signal;
Described software analysis module is called the processing procedure of described measurement frequency modulation on the basis of described restoring signal.
Further, described FSK demodulation module is processed the time domain waveform array of carrying out after the speed adjustment, realizes carrier synchronization and bit synchronization, and output restoring signal step is specially:
Time domain waveform array after resampling is carried out to signal condition;
Time domain waveform array by maximum eye pattern module after to signal condition is processed, and finds the sampling location of initial sampled point and symbol judgement point poor, and this difference is exported to shift module;
Shift module is poor based on the sampling location of maximum eye pattern module output, the time domain waveform array after resampling is carried out to shifting function, thereby obtain bit synchronization signal;
Demodulation module based on the sampling location difference of maximum eye pattern module output the time domain waveform array after to signal condition carry out demodulation;
The FSK modulation module carries out FSK modulation, generating reference signal again to the restituted signal of demodulation module output;
Remove the carrier wave frequency deviation module and receive the bit synchronization signal of shift module output and the reference signal of FSK modulation module output, relatively obtain the carrier frequency difference, remove after the carrier frequency difference to export and realized carrier synchronization and bit synchronous restoring signal.
Based on method provided by the invention, the present invention also provides a kind of parameter measurement system of modulation quality based on software and radio technique, and this system comprises:
By sample devices, for the original time-domain signal that unmodulated, filtering are processed, sample, obtain the sampled value sequence of original time-domain signal;
Universal computing device, corresponding to tested communication standard measuring the software analysis module of modulation quality parameter for loading, this software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and output is for reflecting the modulation quality parameter of measured signal modulation quality.
Further, described software analysis module comprises:
The pretreatment software module, carry out the preprocessing process opposite with modulated process for the sampled value sequence to sample devices output, obtains restoring signal;
Modulation quality parameter measurement software module, for the restoring signal based on the output of pretreatment software module, carry out modulation quality parameter measurement process, obtains the modulation quality parameter of measured signal.
The present invention gathers the original time-domain signal of unmodulated, filtering processing by sample devices, and by sampled value sequence input universal computing device, in universal computing device, adopt corresponding to communication standard measuring the software analysis module of modulation quality parameter, carry out the prefabricated digital signal processing algorithm of being realized by program the sampled value sequence of sample devices output is processed, thereby obtain the modulation quality parameter result of measured signal.The present invention be take software and is core, can customize different software algorithms according to different communication standards, adopt same test platform, the measurement of realization to the modulation quality parameter of multiple distinct communication standards, function, the reduction that can expand existing instrument measured cost, promoted measurement capability.And, owing to can process and the Measurement Algorithm of whole measurement being carried out in good time control and adjustment, therefore be conducive to improve the measuring accuracy of modulation quality parameter.
The accompanying drawing explanation
The measurement method of parameters of the modulation quality based on the software and radio technique flow chart that Fig. 1 provides for the embodiment of the present invention;
The parameter measurement system of the modulation quality based on the software and radio technique structural representation that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 calculates the flow chart of the phase difference of baseband signal for what the embodiment of the present invention provided from the signal sampling value sequence;
Fig. 4 adopts labview to realize the logic realization figure of the measurement of phase difference in one embodiment of the invention;
Fig. 5 is that the functional module of FSK demodulation module in one embodiment of the invention forms schematic diagram;
Fig. 6 is FSK demodulation module signal processing flow schematic diagram in one embodiment of the invention;
Fig. 7 removes the illustrative view of functional configuration of carrier wave frequency deviation module in one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Basic thought of the present invention is: based on software and radio technique, characteristics in conjunction with mobile communication system, on universal computing device, by the software algorithm corresponding with communication standard, realize the Treatment Analysis to digital wireless communication signals, thereby measure the modulation quality parameter that obtains the reflection modulation quality.Universal computing device of the present invention is for the measuring equipment with special demodulating chip, and this universal computing device can be personal computer with general-purpose computations framework, notebook, hand-held mobile computing device etc.
The measurement method of parameters of the modulation quality based on the software and radio technique flow chart that Fig. 1 provides for the embodiment of the present invention, the method are applied to comprise in the measuring system of sample devices, universal computing device formation, comprising:
Step 101, the original time-domain signal of unmodulated, filtering being processed by sample devices are sampled, and obtain the sampled value sequence of original time-domain signal.
The present invention requires to adopt the hardware sample devices of high accuracy, high sampling rate to gather the original time-domain signal of unmodulated, filtering processing, and time-domain signal sampled value sequence is inputted to universal computing device.Described high accuracy and high sample frequency are for the amplitude of wireless communication signals and carrier frequency, the present invention does not limit its concrete scope, as long as can guarantee, each symbol in received radio frames is had to enough sampled points and enough accuracy.
Step 102, on universal computing device, load corresponding to tested communication standard measuring the software analysis module of modulation quality parameter, this software analysis module is by after carrying out the prefabricated digital signal processing algorithm of being realized by program the sampled value sequence of sample devices output being processed, the modulation quality parameter of the tested wireless signal of output.
According to the characteristics of various mobile communication standards, the present invention is directed to the exploitation of different mobile communication standard corresponding be used to measuring the software analysis module of modulation quality parameter, with forms such as interface or dynamic link libraries, be stored on universal computing device.When the wireless signal to certain specific mobile communication standard is measured, by detection mode manually or automatically, load corresponding software analysis module, realize the purpose by the modulation quality of the different communication standard of same test platform analysis, thereby reduced the measurement cost, enlarged the measurement flexibility.
By the software analysis module, carrying out the prefabricated digital signal processing algorithm by the program realization processes the sampled value sequence of sample devices output, thereby obtain the measurement result of the modulation quality parameter of reflection modulation quality, be core of the present invention, the essence of this step is to set up the relation between signal sampling value and modulation quality parameter by mathematical algorithm.
In one embodiment of the present invention, described software analysis module comprises pretreatment software module and modulation quality parameter measurement software module, and described step 102 specifically comprises following two steps:
Steps A 1, call the pretreatment software module, sampled value sequence to sample devices output is carried out the preprocessing process opposite with modulated process, namely the sampled value sequence is carried out the Digital Signal Processing such as sign synchronization, carrier synchronization, resampling, intermediate frequency filtering, thereby obtain restoring signal (Recovered signal);
Steps A 2, call modulation quality parameter measurement software module, based on the restoring signal of pretreatment software module output, carry out modulation quality parameter measurement process, measure the modulation quality parameter of the modulation quality that obtains the reflection measured signal.
From aspects such as fail safe, reliability and the availability of frequency spectrums, consider, current digital modulation system mostly comprises the complicated modulated process such as filtering, Digital Signal Processing, spread spectrum, scrambler.In some cases, the given method of the present invention can directly be calculated the modulation quality parameter that obtains measured signal by modulation quality parameter measurement software module.Yet, modulated process for above-mentioned complexity, in order to measure more accurately the modulation quality parameter, the present invention also need to be before measuring the modulation quality parameter, by calling the pretreatment software module, carry out the preprocessing process opposite with modulated process, described preprocessing process may comprise that signal is synchronous, resample, the digital signal processings such as intermediate frequency filtering, by described preprocessing process, obtain the restoring signal near actual value, then, based on resulting restoring signal, call modulation quality parameter measurement software module again and measure the acquisition measurement result of modulation quality parameter more accurately.
The parameter measurement system of the modulation quality based on software and radio technique that Fig. 2 provides for the embodiment of the present invention, this system comprises:
By sample devices 10, for the original time-domain signal that unmodulated, filtering are processed, sample, obtain the sampled value sequence of original time-domain signal;
Universal computing device 20, corresponding to tested communication standard measuring the software analysis module 220 of modulation quality parameter for loading, this software analysis module is processed the sampled value sequence of sample devices 10 outputs by carrying out the prefabricated digital signal processing algorithm by the program realization, and output is for reflecting the modulation quality parameter of measured signal modulation quality.
In another preferred embodiment, described software analysis module 220 further comprises:
Pretreatment software module 221, carry out the preprocessing process opposite with modulated process for the sampled value sequence to sample devices output, obtains restoring signal;
Modulation quality parameter measurement software module 222, for the restoring signal based on 221 outputs of pretreatment software module, carry out modulation quality parameter measurement process, obtains the modulation quality parameter of measured signal.
In sum, the sample devices in the present invention only is responsible for the collection signal amplitude, and the software analysis module completes each step of signal is processed, analyzed according to different communication standards.Because the software analysis module is realized by programming, can upgrade easily the setting with various configuration parameters, therefore can carry out in good time control and adjustment to process and the Measurement Algorithm of whole measurement, thus the measuring accuracy that is conducive to adapt to the renewal of communication standard and improves the modulation quality parameter.
Below take the measuring process of Bluetooth signal and be example, be described with reference to the accompanying drawings the specific implementation process in the modulation quality parameter measurement process that the present invention is applied to the Bluetooth protocol standard signal.
Bluetooth signal adopts frequency shift keying (Frequency Shift Keying, FSK) modulation system, reacts binary " 1 ", " 0 " by frequency deviation, and the frequency deviation standard value is 157.5kHz.Due to the impact that is subjected to Gauss in Bluetooth system (Gaussian) filter, frequency deviation can change along with the difference of transmission information sequence.Bluetooth standard has reacted the impact of filter on frequency deviation with two information sequences.During bluetooth standard is defined in transmission ' 11110000 ' information sequences, frequency deviation should be able to reach the frequency deviation standard value, is subjected to filter to affect 88% left and right that frequency deviation value is standard frequency deviation when transmitting ' 10101010 ' information sequence.
The frequency modulation parameter is the main parameters of reflection Bluetooth signal modulation quality, and therefore the core content by methods analyst Bluetooth signal modulation quality provided by the invention is the analytic process from sampled value derivation frequency modulation value, and lower mask body is introduced this process.
The mathematic(al) representation of FSK modulation system is suc as formula shown in (1)
Formula (1)
Wherein, Es has represented the energy of signal; The duration of T is-symbol, for Bluetooth signal T=10
-6Second; Fc is carrier frequency; a
nN information bit, a
nValue be+1 or-1, the representative ' 0,1 ' information; θ is the signal phase skew, by initial phase, determined, and be a fixed value; Modulation index h is an important parameter of FSK modulation, and the size of h has determined the size of FSK frequency modulation, to Bluetooth signal h=0.315.Frequency modulation
As h=0.315 a
n=± 1 o'clock, Δ f=± 157.5kHz.
For simplifying computing formula, formula (1) can be rewritten as:
S (t)=Acos[2 π f
cT+2 π Δ ft+ θ] formula (1 ')
If two sampling instant t
1, t
2Mathematic(al) representation be respectively
S(t
1)=Acos[2 π f
ct
1+ 2 π Δ ft
1+ θ] formula (2)
S(t
2)=Acos[2 π f
ct
2+ 2 π Δ ft
2+ θ] formula (3)
Remove carrier signal, baseband signal t
1, t
2Phase place constantly is respectively Φ 1=2 π Δ ft
1+ θ, Φ 2=2 π Δ ft
2+ θ, two formulas are subtracted each other release Δ f=(Φ 2-Φ 1)/[2 π * (t
2-t
1)].
Due to t
2-t
1For the sampling interval is a given value, just can release Δ f as long as therefore obtain the phase difference Φ 2-Φ 1 of baseband signal.
Based on above-mentioned Algorithm Analysis, this specific embodiment realizes that the concrete steps of measurement of the modulation quality parameter of Bluetooth signal are:
Step B1, use spectrum analyzer are sampled to Bluetooth signal, the sampled value sequence of the original time-domain signal of output I/Q value form;
From the frequency range of analytic signal, measuring accuracy and the sample rate of level amplitude, consider, this embodiment selects the hardware of Agilent PSA series E4445 spectrum analyzer as collection signal.With the Trigger Function of frequency spectrograph, analyze burst, and the Measuring Time after triggering is set, 366us for example, to capture the signal of a packets of information (contain packets of information (packet) in time slot, the length of packets of information is 366us).In addition, because the character rate of bluetooth is 1Mbit/S, it is 66.67ns that the sampling interval is set, and has enough sampled points to mean to guarantee each symbol.After completing above the setting, can control the frequency spectrograph image data by the GPIB order, the data of adopting from frequency spectrograph are the character string that figure place is very long, and character string is comprised of a plurality of numerical value, and each numerical value has represented the range value of i/q signal on each sampled point.
Any digital modulation signals all can be used formula V (t)=A*Cos (2 π fc t+ Δ ft+ φ) to express, V (t) is the radio frequency time-domain expression of signal, the amplitude of A representation signal, fc represents carrier frequency, Δ f means the frequency modulation to signal, following formula is launched to V (t)=A*Cos (Δ ft+ φ) * Cos (2 π fC t)-A*Sin (Δ ft+ φ) * Sin (2 π fC t), wherein A*Cos (Δ ft+ φ) is with A*Sin (Δ ft+ φ) i/q signal that frequency spectrograph is adopted, the visible i/q signal collected has just been removed the modulation signal of carrier wave, does not have the processes such as demodulation by filter.Remove universal process and communication standard that the carrier extract i/q signal is each communication standard irrelevant, so this process is not subjected to the restriction of communication standard to be applicable to various communication standards.
Fig. 3 calculates the algorithmic procedure of the phase difference Φ 2-Φ 1 of baseband signal from the signal sampling value sequence, the first step in step B1 corresponding diagram 3 and second step can directly obtain i/q signal value corresponding to each sampling time point by frequency spectrograph.
Step B2, on universal computing device, load software analysis module corresponding to bluetooth standard, this software analysis module is processed the sampled value sequence of frequency spectrograph output by carrying out the prefabricated digital signal processing algorithm by the program realization, the frequency modulation of the tested Bluetooth signal of output.
In this embodiment, described software analysis module realizes by labview software, adopts as shown in Figure 4 the programmed logic that calculates two sampled point phase differences by polar coordinates to realize the measurement of phase difference.
The remaining step of this step corresponding diagram 3, the 3rd step is exported the i/q signal value by frequency spectrograph and is converted into plural form Z=A*Cos (Δ f*t+ φ)+i*A*Sin (Δ f*t+ φ); The 4th step is converted into polar form Z=A*exp (i Δ f*t+ φ) by the sampled value of plural form; The 5th step and the 6th step are by be divided by rear extraction business's phase value of the polar coordinates expression formula of two sampled points, and the phase difference Φ 2-Φ 1 that this phase value is the baseband signal between two sampled points, just can release frequency modulation Δ f by phase difference Φ 2-Φ 1.
In another specific embodiment of the present invention, in order to measure more accurately the frequency modulation of Bluetooth signal, the modulated process of the end sent according to Bluetooth signal, before calculating frequency modulation, by the pretreatment software module, the sampled value sequence of frequency spectrograph output carried out and rebuild waveform, delete the processes such as header signal, resampling, FSK demodulation, thereby output symbol is synchronous and carrier synchronization restoring signal (Recovered signal).As shown in Figure 5, pretreatment software module 221 comprises:
Rebuild waveform module 2211, can be regarded as the interface of software and hardware, mainly complete two functions.At first, will become plural array from the sampled value sequence of expressing with character string forms that frequency spectrograph is adopted, the I/Q amplitude of corresponding each sampled point of the element in array.The second, add temporal information and generate time domain waveform.So-called interpolation temporal information is namely set the time value (can establish initial time is 0 second) of each element in array, and because the element in array is corresponding one by one with sampled point, so in array, the temporal information of each element can obtain by the sampling interval.
Delete header signal module 2212, for the result based on rebuilding waveform module 2211 outputs, front 126 header information of packets of information are deleted, namely delete Partial Elements corresponding to header information in the time domain waveform array.Can be by the following number that needs to delete element that calculates.
The time span of header time span=every information of header information figure place *=126 (bit) *, 1 (us/bit)=126us
Delete element number=header time span/sampling time interval=126us/66.67ns=1890
Therefore delete front 1890 elements in the time domain waveform array.
Resampling module 2213, carry out the speed adjustment for the time domain waveform array to deleting header information, to meet the rate requirement of FSK demodulation module.The FSK demodulation module need complete under sampling rate is the integral multiple of character rate, the resampling process is used for namely realizing that speed adjustment meets the demand of FSK demodulation module.
FSK demodulation module 2214, process for the time domain waveform array to after the adjustment of execution speed, realizes carrier synchronization and bit synchronization, the output restoring signal;
The FSK demodulating process is the set of a series of signal processing procedure, comprises processes such as utilizing Digital Signal Processing (DSP) technological adjustment input waveform, filtering, restituted signal, generating reference signal.By the FSK demodulation, not only obtain information code, and completed carrier synchronization and bit synchronization by its a series of signal processing procedure, obtained restoring signal (Recovered Signal).By the measurement to restoring signal, can directly obtain the modulation quality parameters such as frequency deviation.
Fig. 6 is FSK demodulation module 2214 functions of modules structural representations, and the performed handling process of this module is as follows:
Step C1, the time domain waveform array after resampling is carried out to signal condition; Signal condition mainly comprises processes such as removing carrier wave frequency deviation and filtering, and the purpose of signal condition is to improve signal quality, to avoid in demodulation having error code to produce.
Step C2, the time domain waveform array by maximum eye pattern module after to signal condition are processed, and find the sampling location of initial sampled point and symbol judgement point poor, and this difference is exported to shift module;
The sampling location that step C3, shift module are exported based on maximum eye pattern module is poor, the time domain waveform array after resampling is carried out to shifting function, thereby obtain bit synchronization signal;
Step C4, demodulation module based on the sampling location difference of maximum eye pattern module output the time domain waveform array after to signal condition carry out demodulation;
Step C5, FSK modulation module carry out FSK modulation, generating reference signal again to the restituted signal of demodulation module output;
Step C6, remove the carrier wave frequency deviation module and receive the bit synchronization signal of shift module output and the reference signal of FSK modulation module output, relatively obtain the carrier frequency difference, remove after the carrier frequency difference to export and realized carrier synchronization and bit synchronous restoring signal.
For explanation realizes the implementation of each function by software algorithm, take and remove carrier wave frequency deviation and partly illustrate as example.Fig. 7 removes carrier wave frequency deviation inside modules structural representation for this embodiment, can see intuitively by computer software and calculate principle and the process that frequency deviation realizes carrier synchronization of removing.By the sampled value that receives signal and reference signal sampled point, calculate respectively the frequency modulation that receives signal and each symbolic point of reference signal, the mean value of frequency modulation difference is carrier wave frequency deviation.From receive signal, remove this difference and just realized carrier frequency synchronization.
Method and system provided by the present invention calculates the modulation quality parameter from signal crude sampling value, provides an effective and feasible direction for analysing in depth the modulation quality parameter.Utilize the characteristic of software programmable, emulation easily and debug measurement process, improved flexibility and the autgmentability measured.Application of the present invention is not limited to bluetooth communication standard, also can be used for such as 3G (Third Generation) Moblie standard, the 4th third-generation mobile communication standard and the various communication standards such as WLAN (wireless local area network) and wireless wide area network, also be not limited to the measurement to the frequency modulation in the modulation mass parameter, may be used on equally in the measuring process of other modulation quality parameter.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. the measurement method of parameters of the modulation quality based on software and radio technique, be applied to comprise in the measuring system of sample devices, universal computing device formation, it is characterized in that, the method comprises:
By the original time-domain signal that sample devices is processed unmodulated, filtering, sample, obtain the sampled value sequence of original time-domain signal;
On universal computing device, load corresponding to tested communication standard measuring the software analysis module of modulation quality parameter, this software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and output is for reflecting the modulation quality parameter of measured signal modulation quality.
2. method according to claim 1, it is characterized in that, described software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and the step of the modulation quality parameter of the tested wireless signal of output specifically comprises:
Call the pretreatment software module, the sampled value sequence of sample devices output is carried out to the preprocessing process opposite with modulated process, obtain restoring signal;
Call modulation quality parameter measurement software module, based on the restoring signal of pretreatment software module output, carry out modulation quality parameter measurement process, obtain the modulation quality parameter of measured signal.
3. method according to claim 2, is characterized in that, described preprocessing process is to carry out with modulated terminal the processing procedure that processing procedure is opposite, comprises one or more in waveform reconstruction, deletion header signal, resampling, demodulation.
4. method according to claim 1, is characterized in that, described tested communication standard is Bluetooth protocol, and described modulation quality parameter is frequency modulation, and described method is specially:
Use spectrum analyzer to sample to Bluetooth signal, the sampled value sequence of the original time-domain signal of output I/Q value form;
On universal computing device, load software analysis module corresponding to bluetooth standard, this software analysis module is processed the sampled value sequence of frequency spectrograph output by carrying out the prefabricated digital signal processing algorithm by the program realization, the frequency modulation of the tested Bluetooth signal modulation quality of output reflection.
5. method according to claim 4, it is characterized in that, described software analysis module is carried out the described prefabricated digital signal processing algorithm by the program realization sampled value sequence of frequency spectrograph output is processed, and the step of the frequency modulation of the tested Bluetooth signal modulation quality of output reflection is specially:
The sampled value of the original time-domain signal of the I/Q value form of described frequency spectrograph output is converted into to plural form Z=A*Cos (Δ f*t+ φ)+i*A*Sin (Δ f*t+ φ), the amplitude of A representation signal wherein, Δ f means the frequency modulation to signal, the phase place of the baseband signal that the φ representative is corresponding with sampling instant;
The sampled value of plural form is converted into to polar form Z=A*exp (i Δ f*t+ φ);
By be divided by rear extraction business's phase value of the polar coordinates expression formula of two sampled points, this phase value is the phase difference Φ 2-Φ 1 of the baseband signal between two sampled points;
According to Δ f=(Φ 2-Φ 1)/[2 π * (t
2-t
1)] calculate frequency modulation Δ f, wherein t1 and t2 are respectively two sampling instant Φ 1 and Φ 2 phase place for the baseband signal corresponding with sampling instant.
6. method according to claim 5, is characterized in that, described software analysis module, before the described prefabricated digital signal processing algorithm of being realized by program of execution is processed the sampled value sequence of frequency spectrograph output, is also carried out following preprocessing process:
By rebuilding waveform module, will become plural array from the sampled value sequence of expressing with character string forms that frequency spectrograph is adopted, the I/Q amplitude of corresponding each sampled point of the element in array; For each sampled point adds temporal information, generate the time domain waveform array, the element in array is corresponding one by one with sampled point;
By deleting the header signal module, the header information of packets of information is deleted, namely delete Partial Elements corresponding to header information in the time domain waveform array;
By the resampling module, the time domain waveform array of deleting header information is carried out to the speed adjustment, to meet the rate requirement of FSK demodulation module;
By the FSK demodulation module, the time domain waveform array of carrying out after the speed adjustment is processed, realized carrier synchronization and bit synchronization, the output restoring signal;
Described software analysis module is called the processing procedure of described measurement frequency modulation on the basis of described restoring signal.
7. method according to claim 6, is characterized in that, described FSK demodulation module is processed the time domain waveform array of carrying out after the speed adjustment, realizes carrier synchronization and bit synchronization, and output restoring signal step is specially:
Time domain waveform array after resampling is carried out to signal condition;
Time domain waveform array by maximum eye pattern module after to signal condition is processed, and finds the sampling location of initial sampled point and symbol judgement point poor, and this difference is exported to shift module;
Shift module is poor based on the sampling location of maximum eye pattern module output, the time domain waveform array after resampling is carried out to shifting function, thereby obtain bit synchronization signal;
Demodulation module based on the sampling location difference of maximum eye pattern module output the time domain waveform array after to signal condition carry out demodulation;
The FSK modulation module carries out FSK modulation, generating reference signal again to the restituted signal of demodulation module output;
Remove the carrier wave frequency deviation module and receive the bit synchronization signal of shift module output and the reference signal of FSK modulation module output, relatively obtain the carrier frequency difference, remove after the carrier frequency difference to export and realized carrier synchronization and bit synchronous restoring signal.
8. the parameter measurement system of the modulation quality based on software and radio technique, is characterized in that, comprising:
By sample devices, for the original time-domain signal that unmodulated, filtering are processed, sample, obtain the sampled value sequence of original time-domain signal;
Universal computing device, corresponding to tested communication standard measuring the software analysis module of modulation quality parameter for loading, this software analysis module is processed the sampled value sequence of sample devices output by carrying out the prefabricated digital signal processing algorithm by the program realization, and output is for reflecting the modulation quality parameter of measured signal modulation quality.
9. system according to claim 8, is characterized in that, described software analysis module comprises:
The pretreatment software module, carry out the preprocessing process opposite with modulated process for the sampled value sequence to sample devices output, obtains restoring signal;
Modulation quality parameter measurement software module, for the restoring signal based on the output of pretreatment software module, carry out modulation quality parameter measurement process, obtains the modulation quality parameter of measured signal.
10. system according to claim 8, is characterized in that, described tested communication standard is Bluetooth protocol, and described modulation quality parameter is frequency modulation.
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