CN103701741A - Method for achieving signal modulation quality measurement and constellation diagram display - Google Patents
Method for achieving signal modulation quality measurement and constellation diagram display Download PDFInfo
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Abstract
The invention relates to a method for achieving signal modulation quality measurement and constellation diagram display. The method comprises the following steps: extracting out the optimal sampling receiving signal from sampling signals received at the receiving end and dividing into two paths of signals to be operated; processing the first path of optimal sampling receiving signal by a measurement filter to obtain a receiving measurement signal for modulation quality measurement; modulating the second path of optimal sampling receiving signal and then processing by a modulating filter and the measurement filter to obtain a receiving cvfreference signal; comparing the receiving measurement signal for modulation quality measurement with the receiving reference signal to obtain vector modulation errors and a constellation diagram of vector modulation error distribution. By adopting the method for implementing signal modulation quality measurement and constellation diagram display, according to the vector modulation errors obtained by comparison between the reconstructed transmitting end reference signal and the receiving end measurement signal, the limitation that some communication system transmitting ends do not have a matched filtering mode and cannot be applicable to the traditional measurement mode is avoided, and the method has a wider application range.
Description
Technical field
The present invention relates to less radio-frequency field tests, relate in particular to mass measurement and the demonstration field of the modulation signal that contains intersymbol interference, specifically refer to a kind of method that signal modulation quality is measured and planisphere shows that realizes.
Background technology
In modern digital radio communication, the wireless device of many standards can use formed filter at transmitter, and actual modulated signal is carried out to molding filtration, then this signal is used for to transmitting.This mode can be introduced intersymbol interference (ISI) to source digital signal.For measurand transmitter signal quality, at receiving terminal, common processing method is first with the matched filter of transmitting terminal formed filter, to eliminate intersymbol interference.In the wireless communication system in standards such as TD-SCDMA and WCDMA, transmitting terminal is used RRC filter as formed filter.For measurand transmitter signal quality, need use corresponding RRC filter to carry out to received signal matched filtering at receiving terminal, remove to receive the ISI in signal, then carry out to received signal the measurement of the modulation quality indexs such as EVM, and planisphere that can realization response signal modulation quality shows.
There is following shortcoming in prior art:
1,, in current main-stream communication standard, some standard does not have corresponding with it matched filter as formed filter (class Gaussian filter) that GSM/EDGE was used, cannot use this type of technology accurately to measure the modulation quality EVM that receives signal;
2, in measuring process, need to draw the planisphere of reflection transmitter primary signal modulation quality, use this type of technology to be not easy to reduce on request and the planisphere that shows this type of signal.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of can realize according to reconstruct transmitting terminal reference signal and receiving terminal measuring-signal, compare obtain vector modulation error, avoid some communication standard transmitting terminal not possess the mode of matched filtering and cannot be suitable for traditional measurement mode limitation, there is the method that signal modulation quality is measured and planisphere shows that realizes of broader applications scope.
To achieve these goals, the method that realizes the measurement of signal modulation quality and planisphere demonstration of the present invention has following formation:
This realizes the method that signal modulation quality is measured and planisphere shows, its main feature is that described method comprises the following steps:
(1) in the sampled signal of receiving at receiving terminal, extract optimum sampling reception signal and be divided into two paths of signals and operate;
(2) first via optimum sampling is received to signal and obtain through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality;
(3) the measurement filter of the second road optimum sampling reception signal being modulated again by overmolding filter and measurement agreement regulation obtains the reception reference signal of measuring for modulation quality;
(4) the described reception measuring-signal of measuring for modulation quality and reception reference signal are compared and are obtained the planisphere that vector modulation error and vector modulation error distribute.
Preferably, in the described sampled signal of receiving at receiving terminal, extract optimum sampling and receive signal, comprise the following steps:
(11) sampled signal of receiving terminal being received synchronously obtains optimum sampling point;
(12) in the sampled signal of receiving at receiving terminal according to optimum sampling point, extract optimum sampling and receive signal.
Preferably, described signal that first via optimum sampling is received obtains through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality, comprises the following steps:
(21) first via optimum sampling is received to signal and carry out minimum error operational processes;
(22) first via optimum sampling through minimum error operational processes is received to signal and obtain through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality.
More preferably, described carries out minimum error operational processes to first via optimum sampling reception signal, is specially:
First via optimum sampling is received to signal and carry out correcting frequency deviation, initial phase deflection correction, DC compensation, root-mean-square error compensation and power normalization operational processes.
Preferably, the described measurement filter that the second road optimum sampling reception signal is modulated again by overmolding filter and measurement agreement regulation obtains the reception reference signal of measuring for modulation quality, comprises the following steps:
(31) the second road optimum sampling being received to signal carries out parsing the symbolic information that the second road optimum sampling receives signal after correcting frequency deviation and initial phase deflection correction;
(32) symbolic information according to the second road optimum sampling reception signal modulates standard modulation signal again;
(33) heavy fresh standard modulation signal being obtained to ideal by the formed filter identical with transmitting terminal transmits;
(34) described ideal is transmitted and by measuring the measurement filter of agreement regulation, obtain the reception reference signal of measuring for modulation quality.
More preferably, between described step (33) and (34), further comprising the steps of:
(331) according to described ideal, transmit and weigh fresh standard modulation signal and obtain reflecting that intersymbol interference affects the planisphere of rule on modulation signal distributions.
More preferably, described compares and obtains vector modulation error by the described reception measuring-signal of measuring for modulation quality and reception reference signal, comprises the following steps:
(41) the described reception measuring-signal of measuring for modulation quality and reception reference signal compare and obtain modulation error;
(42) according to described modulation error, calculate vector modulation error.
Further, described step (4) is afterwards, further comprising the steps of:
(5) by the fresh standard modulation signal of described weight and the synthetic planisphere that obtains reflecting the modulation signal of being modulated error effect of modulation error.
Further, described step (4) is afterwards, further comprising the steps of:
(6) the fresh standard modulation signal of described weight is added to simulaed interference signal and obtain the modulation signal disturbing containing analog input;
(7) by the described modulation signal disturbing containing analog input and the synthetic planisphere that obtains reflecting the modulation signal that is subject to analog input interference effect of modulation error.
Adopt the method that signal modulation quality is measured and planisphere shows that realizes in this invention, there is following beneficial effect:
The present invention, according to the method for reconstruct transmitting terminal reference signal, compares and draws modulation error vector with receiving terminal measuring-signal, can be for the measurement of modulation quality EVM, and can draw very easily the planispheres such as modulation signal of reflection modulation quality situation; This scheme has been avoided, and does not possess the mode of matched filtering at some communication standard transmitting terminal, cannot be suitable for the limitation that traditional matched filtering processing scheme is carried out modulation quality measurement; Meanwhile, this scheme can also be utilized the parameter obtaining in measurement procedure, carries out the test of signal interference simulation, and can by the mode of planisphere, carry out display measurement result to the modulation signal under various error state impacts, has range of application widely.
Accompanying drawing explanation
Fig. 1 is the flow chart of realizing the method for the measurement of signal modulation quality and planisphere demonstration of the present invention.
Fig. 2 is the flow chart that the method that realizes the measurement of signal modulation quality and planisphere demonstration of the present invention is applied to embodiment.
Embodiment
In order more clearly to describe technology contents of the present invention, below in conjunction with specific embodiment, conduct further description.
Core concept of the present invention is: the present invention does not use the method for matched filter to remove the ISI(Inter Symbol Interference that receives signal, intersymbol interference), but the ideal signal that comprises ISI by reduction transmitting terminal, as reference signal, test the modulation quality EVM(Error Vector Magnitude transmitting, vector modulation error).In test process, according to universal test standard, by receiving signal and reference signal by same measurement filter, then these two kinds of signals are compared, draw the vector amplitude error (EVM) of transmitter signal.And carry out restoration transmitter original modulated signal by EVM and reference signal.
The present invention is based on such principle:
For terminal test system, when test receiver signal modulation quality, must remove the impact of the ISI that frequency deviation, initial skew and transmitting terminal formed filter bring.For receiving signal R, be ISI, the modulation error E by standard modulation signal MAP, filter input in fact, and other transmitted noises n composition, its pass is:
R＝MAP+E+ISI+n
When using measuring instrument to carry out modulation quality test, it has been generally acknowledged that the impact that transmitted noise n causes can ignore.Therefore can resolve modulation error with structure reference signal V.Its concrete handling process, as shown in Fig. 1～2, is explained in detail as follows:
Step 1.1: the sampled signal that receiving terminal is received carries out synchronously, finding out optimum sampling point SYNC(synchronous).
Step 1.2: according to optimum sampling point, extract a road optimum sampling and receive signal R (n).The subsequent treatment that receives signal for this, is divided into that two-way is parallel to carry out:
Step 1.3.1:(1) first via optimum sampling is received to signal R (n), carry out successively frequency deviation/initial phase deflection correction, DC compensation, RMS(Root-Mean-Square, root mean square) error compensation, and power normalization operation, make measuring-signal reach RMS EVM statistics according to measurement agreement regulation and minimize.(2) sampled signal obtaining after minimum error operation, needs, through measuring the measurement filter of agreement regulation, finally to obtain the reception measuring-signal of measuring for EVM
now
the interference that wherein I may introduce for measuring filter.
Step 1.3.2:(1) the second road optimum sampling is received to signal R (n), advanced line frequency partially/initial phase deflection correction, then this signal is carried out to joint-detection, resolve the symbolic information that draws signal.(2) and according to this symbolic information, again modulate standard modulation signal MAP(as QPSK, 8PSK etc.).(3) make heavy fresh signal MAP by the formed filter identical with transmitting terminal, the ideal the obtaining S (n) that transmits.Ideal transmits S (n) by formed filter, has been introduced into the ISI the same with transmitting terminal, so the pass between each parameter is S (n)=MAP+ISI.Can use planisphere herein, reflect that very clearly ISI is for the distribution influence rule of modulation signal.(4) make ideal transmit S (n) through measuring the measurement filter of agreement regulation, finally obtain measuring and receiving reference signal V (n) for EVM.Known V (n)=MAP+ISI+I, the interference that wherein I may introduce for measuring filter.
Step 1.4: step 1.3.1 is obtained
the V (n) obtaining with step 1.3.2 compares, and can obtain modulation error E (n).By E (n), can calculate modulation quality test result " vector modulation error " (EVM).Simultaneously because error for this reason can show as vector form, therefore can show in the mode of planisphere this error distribution.
Step 1.5: the standard modulation signal MAP obtaining in step 1.3.2 they (2) can be synthetic with modulation error E (n), obtains accurately reflecting the modulated signal constellation of " being modulated error effect ", shows for test instrumentation.
Except above function, use the modulation quality test macro of this scheme, also possess analog input and disturb, and possess the function that accurately reflects suffered interference effect in planisphere.Its handling process is also contained in Fig. 2, and step is as follows:
Step 2.1: carry out successively all processing of step 1.1～step 1.4 as above, obtain modulation error E (n).
Step 2.2: the standard modulation signal MAP to gained in said process, add simulaed interference signal, obtain signal U (n).
Step 2.3: signal U (n) and E (n) is synthetic, can simulate the transmission modulation signal being disturbed.This signal can show output by test instrumentation.
Adopt above technical scheme, the present invention has realized following object:
Proposed a kind ofly based on matched filtering, just can not measure the mode of wireless transmission signal modulation quality EVM, proposed the method that the mode of a kind of basis based on reconstructed reference signal parses modulation error vector and obtain thus modulation quality measurement result EVM; Propose a kind of planisphere according to modulation error vector and observed the method that modulation error distributes; Proposed a kind ofly according to modulation error vector standard modulation signal, to synthesize modulated signal constellation, and the method showing for test instrumentation; Proposed a kind ofly according to modulation error vector and standard modulation signal, can accurately simulate the transmission modulation signal being disturbed, and the method showing for test instrumentation planisphere.
Adopt the method that signal modulation quality is measured and planisphere shows that realizes in this invention, there is following beneficial effect:
The present invention, according to the method for reconstruct transmitting terminal reference signal, compares and draws modulation error vector with receiving terminal measuring-signal, can be for the measurement of modulation quality EVM, and can draw very easily the planispheres such as modulation signal of reflection modulation quality situation; This scheme has been avoided, and does not possess the mode of matched filtering at some communication standard transmitting terminal, cannot be suitable for the limitation that traditional matched filtering processing scheme is carried out modulation quality measurement; Meanwhile, this scheme can also be utilized the parameter obtaining in measurement procedure, carries out the test of signal interference simulation, and can by the mode of planisphere, carry out display measurement result to the modulation signal under various error state impacts, has range of application widely.
In this specification, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. realize the method that signal modulation quality is measured and planisphere shows, it is characterized in that, described method comprises the following steps:
(1) in the sampled signal of receiving at receiving terminal, extract optimum sampling reception signal and be divided into two paths of signals and operate;
(2) first via optimum sampling is received to signal and obtain through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality;
(3) the measurement filter of the second road optimum sampling reception signal being modulated again by overmolding filter and measurement agreement regulation obtains the reception reference signal of measuring for modulation quality;
(4) the described reception measuring-signal of measuring for modulation quality and reception reference signal are compared and are obtained the planisphere that vector modulation error and vector modulation error distribute.
2. the method that realizes the measurement of signal modulation quality and planisphere demonstration according to claim 1, is characterized in that, extracts optimum sampling and receive signal in the described sampled signal of receiving at receiving terminal, comprises the following steps:
(11) sampled signal of receiving terminal being received synchronously obtains optimum sampling point;
(12) in the sampled signal of receiving at receiving terminal according to optimum sampling point, extract optimum sampling and receive signal.
3. according to claim 1ly realize that signal modulation quality is measured and the method for planisphere demonstration, it is characterized in that, described signal that first via optimum sampling is received obtains through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality, comprises the following steps:
(21) first via optimum sampling is received to signal and carry out minimum error operational processes;
(22) first via optimum sampling through minimum error operational processes is received to signal and obtain through measuring the measurement filter of agreement regulation the reception measuring-signal of measuring for modulation quality.
4. the method that realizes the measurement of signal modulation quality and planisphere demonstration according to claim 3, is characterized in that, described carries out minimum error operational processes to first via optimum sampling reception signal, is specially:
First via optimum sampling is received to signal and carry out correcting frequency deviation, initial phase deflection correction, DC compensation, root-mean-square error compensation and power normalization operational processes.
5. according to claim 1ly realize that signal modulation quality is measured and the method for planisphere demonstration, it is characterized in that, the described measurement filter that the second road optimum sampling reception signal is modulated again by overmolding filter and measurement agreement regulation obtains the reception reference signal of measuring for modulation quality, comprises the following steps:
(31) the second road optimum sampling being received to signal carries out parsing the symbolic information that the second road optimum sampling receives signal after correcting frequency deviation and initial phase deflection correction;
(32) symbolic information according to the second road optimum sampling reception signal modulates standard modulation signal again;
(33) heavy fresh standard modulation signal being obtained to ideal by the formed filter identical with transmitting terminal transmits;
(34) described ideal is transmitted and by measuring the measurement filter of agreement regulation, obtain the reception reference signal of measuring for modulation quality.
6. the method that realizes the measurement of signal modulation quality and planisphere demonstration according to claim 5, is characterized in that, between described step (33) and (34), further comprising the steps of:
(331) according to described ideal, transmit and weigh fresh standard modulation signal and obtain reflecting that intersymbol interference affects the planisphere of rule on modulation signal distributions.
7. according to claim 5ly realize that signal modulation quality is measured and the method for planisphere demonstration, it is characterized in that, described compares and obtains vector modulation error by the described reception measuring-signal of measuring for modulation quality and reception reference signal, comprises the following steps:
(41) the described reception measuring-signal of measuring for modulation quality and reception reference signal compare and obtain modulation error;
(42) according to described modulation error, calculate vector modulation error.
8. the method that realizes the measurement of signal modulation quality and planisphere demonstration according to claim 7, is characterized in that, described step (4) is afterwards, further comprising the steps of:
(5) by the fresh standard modulation signal of described weight and the synthetic planisphere that obtains reflecting the modulation signal of being modulated error effect of modulation error.
9. the method that realizes the measurement of signal modulation quality and planisphere demonstration according to claim 7, is characterized in that, described step (4) is afterwards, further comprising the steps of:
(6) the fresh standard modulation signal of described weight is added to simulaed interference signal and obtain the modulation signal disturbing containing analog input;
(7) by the described modulation signal disturbing containing analog input and the synthetic planisphere that obtains reflecting the modulation signal that is subject to analog input interference effect of modulation error.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110149650A (en) * | 2014-08-31 | 2019-08-20 | 优倍快网络公司 | The method and wireless device of monitoring wireless network |
| US11451545B2 (en) | 2014-03-07 | 2022-09-20 | Ubiquiti Inc. | Cloud device identification and authentication |
| US11751068B2 (en) | 2014-06-30 | 2023-09-05 | Ubiquiti Inc. | Methods and tools for assisting in the configuration of a wireless radio network |
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| CN102739328A (en) * | 2012-06-18 | 2012-10-17 | 航天恒星科技有限公司 | Error vector magnitude measurement device and method for satellite mobile communication terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102638319A (en) * | 2012-04-23 | 2012-08-15 | 北京空间飞行器总体设计部 | Modulation performance test method for navigational satellite binary offset carrier signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11451545B2 (en) | 2014-03-07 | 2022-09-20 | Ubiquiti Inc. | Cloud device identification and authentication |
| US12160424B2 (en) | 2014-03-07 | 2024-12-03 | Ubiquiti Inc. | Cloud device identification and authentication |
| US11751068B2 (en) | 2014-06-30 | 2023-09-05 | Ubiquiti Inc. | Methods and tools for assisting in the configuration of a wireless radio network |
| CN110149650A (en) * | 2014-08-31 | 2019-08-20 | 优倍快网络公司 | The method and wireless device of monitoring wireless network |
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| US11943755B2 (en) | 2014-08-31 | 2024-03-26 | Ubiquiti Inc. | Methods and apparatuses for graphically indicating station efficiency and pseudo-dynamic error vector magnitude information for a network of wireless stations |
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Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 4th Floor, Building 28, No. 69, Guiqing Road, Xuhui District, Shanghai, 200233 Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |