CN102195727B - Digital modulation quality parameter metering method and system based on setting of baseband constellation diagram - Google Patents

Abstract

The invention discloses a digital modulation quality parameter metering method and system based on the setting of a baseband constellation diagram, which are used for solving the problem that a VSA (vector signal analyzer) can not be accurately and completely calibrated because modulation errors can not be stably and accurately set and modulated. When the VSA is calibrated by the invention, the baseband constellation diagram is firstly configured according to the modulation mode and the target modulation error parameters; the constellation diagram is set in a VSG (vector signal generator), and the consistent modulation and demodulation parameters are set for the VSA and the VSG; and finally, the modulation errors are measured in the VSA, and the VSA is calibrated according to the difference value of the modulation errors which are obtained through the measurement with the preset modulation errors. In the invention, the standard signals which are generated based on the baseband constellation diagram are real vector modulation signals, and the modulation errors of the digital modulation signals which are emitted by the VSG can be stably and accurately set and adjusted based on the baseband constellation diagram, thus the integrity and accuracy of the VSA calibration are improved.

Description

Digital modulation quality parameter metering method and system based on the setting of base band planisphere

Technical field

The present invention relates to the metering of digital modulation quality parameter and the calibration of VSA.Be particularly related to the digital modulation quality parameter metering method and the system that arrange based on the base band planisphere.

Background technology

The Vector Modulation signal is the main carrier of modern digital wireless communication system information transmission, in the research and development and production process of wireless communications products, must use VSA (Vector Signal Analyzer, VSA) and the vector signal generator (Vector Signal Generator VSG) partly measures and tests transmitter and receiver respectively.Guarantee to obtain accurate, reliable measurement, test result in Related product research and development and the production, the accuracy of measurement of institute's use instrument must be guaranteed fully.One of task of metering is exactly to use reality the measurement value of instrument to be traceable on the value that country is basic, standard set-up reappears by the continual chain of tracing to the source, the actual accuracy of measurement of using instrument of checking, or definite measure error thus.

For the Vector Modulation signal in the modern digital wireless communication system, the Vector Modulation mass parameter is to need one of major parameter of accurately measuring, mainly comprise range error (Magnitude Error, MagErr), phase error (Phase Error, PhaseErr) and Error Vector Magnitude (Error Vector Magnitude, EVM) etc.

In practical communication system, because the existence of imperfect transmitter and imperfect transmission channel, often there is certain damage in digital modulation signals at receiving terminal, but needs only modulation error within the certain index scope, and receiving system just can be finished normal reception.Therefore in various mobile communication standards, the capital provides the limit value regulation to the modulation quality of modulation signal, for example, (Universal Mobile Telecommunications System, UMTS) regulation of EVM value is to be no more than 17.5% to universal mobile telecommunications system in the third generation partner program 3GPP technical standard.Therefore, when VSA measurement EVM value is calibrated, not only to guarantee near the accuracy the error null value, also need guarantee the accuracy of measurement in 0～17.5% scope.Yet, at present when calibration VSA, only can calibrate near its accuracy of measurement the error null value, accuracy of measurement to non-zero modulation error place can't be calibrated, reason is to lack a kind of VSG that can stablize, regulate and arrange modulation error exactly, or saying to lack a kind ofly can make VSG output have stable, the method for the digital modulation signals of modulation error accurately.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of digital modulation quality parameter metering method and system that arranges based on the base band planisphere, be used for solving owing to can not stablize, arrange exactly and regulate modulation error, can not accurately carry out the problem of integral calibration to VSA VSA.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of digital modulation quality parameter metering method that arranges based on the base band planisphere, this method comprises:

According to selected modulation system and default target modulation error parameter configuration base band planisphere;

Described base band planisphere is set among the VSG;

For VSG and VSA arrange consistent modulation parameter, the digital modulation signals that VSG is generated is input among the VSA;

Measure the measured value of vector modulation error by VSA.

Further, according to selected modulation system and the method that default target modulation error parameter disposes the base band planisphere be:

Selecting modulation mode, goal-selling modulation error parameter value;

According to selected modulation system, determine the relative position of reference constellation point;

Relative position and default target modulation error parameter value according to reference constellation point are determined actual constellation point position, are met the base band planisphere of goal-selling modulation error parameter value.

Based on the embodiment of the invention, when described target modulation error parameter is rms amplitude error MagErr _RmsThe time, at two actual constellation points of each reference constellation point configuration, described actual constellation point is on the line of described reference constellation point and the origin of coordinates, and be distributed in described reference constellation point both sides, described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant; The relative coordinate of described two actual constellation points in first quartile (b, b), (c c) obtains by following formula:

$b=\frac{-4+\sqrt{16-4{[2-{(2-{\mathrm{MagErr}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-{\mathrm{MagErr}}_{\mathrm{rms}}^2)}^2]}$

c＝1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

Based on the embodiment of the invention, when described target modulation error parameter is root mean square phase error PhaseErr _RmsThe time, at two actual constellation points of each reference constellation point configuration, described actual constellation point is being the center of circle with the origin of coordinates, putting origin of coordinates distance with described reference constellation is on the circular arc of radius, and be distributed in described reference constellation point both sides, described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant; The relative coordinate of described two actual constellation points in first quartile (b, c), (c b) obtains by following formula:

$b=\mathrm{tg}(\frac{\mathrm{\π}}{4}-\frac{\mathrm{\π}*{\mathrm{PhaseErr}}_{\mathrm{rms}}}{180})$

c＝1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

Based on the embodiment of the invention, when described target modulation error parameter is root-mean-square error amplitude of the vector EVM _RmsThe time, at four actual constellation points of each reference constellation point configuration, wherein two actual constellation points are on the line of described reference constellation point and the origin of coordinates, two actual constellation points are being the center of circle with the origin of coordinates in addition, putting origin of coordinates distance with described reference constellation is on the circular arc of radius, and described actual constellation point is distributed in described reference constellation point both sides, and described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant; The relative coordinate of described four actual constellation points in first quartile (b, b), (c, c), (b, c), (c b) obtains by following formula:

$b=\frac{-4+\sqrt{16-4{[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}$

c＝1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

Based on the embodiment of the invention, the present invention also provides a kind of digital modulation quality parameter metering system that arranges based on the base band planisphere, and this system comprises:

Configuration module is used to vector signal generator configuration base band planisphere, and the modulation and demodulation parameter is set for vector signal generator VSG and VSA VSA;

Vector signal generator VSG is used for generating the digital modulation signals that has goal-selling modulation error parameter according to the base band planisphere of described configuration module configuration and the modulation parameter of setting;

VSA VSA is used for receiving the digital modulation signals that has goal-selling modulation error parameter that VSG exports, and the demodulation parameter of the described configuration module setting of foundation carries out demodulation to the digital modulation signals that receives, and measures vector modulation error.

Further, described configuration module comprises:

The constellation configuration module for according to default modulation system and default target modulation error parameter, disposes the base band planisphere, and described base band planisphere is set among the vector signal generator VSG;

The modulation parameter configuration module is used to vector signal generator VSG with VSA VSA consistent modulation parameter and demodulation parameter to be set.

The present invention is when calibrating VSA, at first according to modulation system and target modulation error parameter configuration base band planisphere, then the base band planisphere is set among the VSG, for VSA and VSG arrange consistent modulation and demodulation parameter, in VSA, measure modulation error at last, according to the difference of measuring the modulation error that obtains modulation error and preset VSA is calibrated.The standard signal that the present invention is based on the generation of base band planisphere is real Vector Modulation signal, and based on the modulation error that the digital modulation signals that VSG sends can be stablized, be arranged exactly and regulate to the base band planisphere, therefore improved calibration integrality and the accuracy of VSA.Method of the present invention is applicable to all digital modulation modes, as MPSK, and MQAM etc., the scope of application is extensive.

Description of drawings

Fig. 1 forms structure chart for the digital modulation quality parameter metering system functional module based on the setting of base band planisphere that the embodiment of the invention provides;

Fig. 2 is the definition schematic diagram of vector modulation error parameter;

The flow chart of the digital modulation quality parameter metering method that arranges based on the base band planisphere that Fig. 3 provides for the embodiment of the invention;

Near two actual constellation points that Fig. 4 reference constellation point when the metering target is the rms amplitude error in the embodiment of the invention is schematic diagram is set;

Near two actual constellation points that Fig. 5 reference constellation point when the metering target is the root mean square phase error in the embodiment of the invention is schematic diagram is set;

Near four actual constellation points that Fig. 6 reference constellation point when the metering target is the root-mean-square error amplitude of the vector in the embodiment of the invention is schematic diagram is set;

Base band constellation schematic diagram when the metering target is the rms amplitude error under the QPSK modulation system that Fig. 7 provides for the embodiment of the invention;

Base band constellation schematic diagram when the metering target is the root mean square phase error under the QPSK modulation system that Fig. 8 provides for the embodiment of the invention;

Base band constellation schematic diagram when the metering target is the root-mean-square error amplitude of the vector under the QPSK modulation system that Fig. 9 provides for the embodiment of the invention;

The interface schematic diagram based on the configuration module in the digital modulation quality parameter metering device of base band planisphere setting that Figure 10 provides for the embodiment of the invention;

Under the QPSK modulation system that Figure 11 provides for the embodiment of the invention, the metering target is respectively the schematic diagram that imports the base band planisphere of VSG under rms amplitude error, root mean square phase error, three kinds of situations of root-mean-square error amplitude of the vector.

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.

Fig. 1 is that the digital modulation quality parameter metering system functional module that arranges based on the base band planisphere provided by the invention is formed structural representation, and this system comprises configuration module 110, vector signal generator VSG and VSA VSA, wherein:

Configuration module 110 is used to vector signal generator configuration base band planisphere, and the modulation and demodulation parameter is set for vector signal generator VSG and VSA VSA;

Described configuration module 110 further comprises:

Constellation configuration module 111 for according to default modulation system and default target modulation error parameter, disposes the base band planisphere, and described base band planisphere is set among the vector signal generator VSG;

The modulation parameter arranges module 112, be used to vector signal generator VSG with VSA VSA consistent modulation parameter and demodulation parameter to be set, described modulation parameter and demodulation parameter comprise: modulation system, carrier frequency, signal level, code check, filter type, filter coefficient etc.;

Vector signal generator VSG is used for generating the digital modulation signals that has goal-selling modulation error parameter according to base band planisphere and the modulation parameter of described configuration module 110 configurations;

VSA VSA is used for receiving the digital modulation signals that has goal-selling modulation error parameter that VSG exports, and the demodulation parameter that disposes according to described configuration module 110 carries out demodulation to the digital modulation signals that receives, and measures vector modulation error.

The present invention calibrates VSA accurately according to the difference that the vector modulation error of reading from VSA VSA reaches between the default target modulation error.

Fig. 3 is the digital modulation quality parameter metering method flow chart that arranges based on the base band planisphere provided by the invention, this method can produce the digital modulation signals that has the goal-selling modulation error according to different digital modulation modes, and realization logarithm tone of Chinese characters error processed is stablized, regulated exactly and arranges.This method specifically comprises:

Step 301: according to default modulation system and default target modulation error parameter, configuration base band planisphere;

Most important modulation error parameter comprises: range error MagErr, phase error PhaseErr and Error Vector Magnitude EVM, the definition of each parameter as described in Figure 2, if the modulation error of all symbols is carried out the root mean square statistics, can draw rms amplitude error MagErr _Rms, root mean square phase error PhaseErr _RmsWith root-mean-square error amplitude of the vector EVM _Rms

Below at different modulation error parameters, illustrate the method for configuration base band planisphere:

(1) when the target modulation error parameter be rms amplitude error MagErr _RmsThe time, the method that disposes described base band planisphere is:

Steps A 3011, selecting modulation mode, goal-selling rms amplitude error MagErr _Rms

Steps A 3012, according to selected modulation system, determine the relative position of reference constellation point;

Steps A 3013, according to the relative position of reference constellation point and default target rms amplitude error MagErr _RmsDetermine actual constellation point position, be met goal-selling rms amplitude error MagErr _RmsThe base band planisphere;

As shown in Figure 4, solid dot is the reference constellation point, two actual constellation points is configured on the line (as the figure dotted line) of reference constellation point and initial point, and is distributed in reference constellation point both sides, shown in the figure hollow dots.Wherein the absolute coordinate position of reference constellation point (solid dot) is not artificial the setting, be VSA power average value and selected demodulation mode automatic setting according to two actual constellation points (hollow dots) in demodulating process, thus, the relative position of knowing two actual constellation points (hollow dots) and reference constellation point (solid dot) has namely determined rms amplitude error MagErr _RmsOn the contrary, if preset target rms amplitude error MagErr _Rms, just can determine the relative position of two actual constellation points (hollow dots) according to the relative position of reference constellation point, and the absolute position of reference constellation point is determined by the average power of actual constellation point.

Equally, if for selected modulation system, a plurality of reference constellation points are arranged in the first quartile, same by above method, on the line of each reference constellation point and initial point, the both sides of reference constellation point dispose an actual constellation point respectively, and its relative position is by default rms amplitude error MagErr _RmsCalculate and determine.At last, with the actual constellation point symmetry of first quartile be mapped to second and third, in the four-quadrant, namely can draw the base band planisphere that satisfies goal-selling rms amplitude error.

(2) when the target modulation error parameter be root mean square phase error PhaseErr _RmsThe time, the method that disposes described base band planisphere is:

Step B3011, selecting modulation mode, goal-selling root mean square phase error PhaseErr _Rms

Step B3012, according to selected modulation system, determine the relative position of reference constellation point;

Step B3013, according to the relative position of reference constellation point and default target root mean square phase error PhaseErr _RmsDetermine actual constellation point position, draw and satisfy goal-selling root mean square phase error PhaseErr _RmsThe base band planisphere;

As shown in Figure 5, solid dot is the reference constellation point, and it is the center of circle that two actual constellation points are configured in the initial point, be on the circular arc of radius with reference constellation point (solid dot) to initial point distance, in reference constellation point (solid dot) both sides, and angle ∠ AOB is equal with angle ∠ AOC, shown in the figure hollow dots.Wherein the absolute coordinate position of reference constellation point (solid dot) is not artificial the setting, be that VSA power average value and selected demodulation mode according to two actual constellation points (hollow dots) in demodulating process set, thus, the relative position of knowing two actual constellation points (hollow dots) and reference constellation point (solid dot) has namely determined root mean square phase error PhaseErr _RmsOn the contrary, if preset target root mean square phase error PhaseErr _Rms, just can determine the relative position of two actual constellation points (hollow dots) according to the relative position of reference constellation point.

Equally, if for selected modulation system, a plurality of reference constellation points are arranged in the first quartile, same by above method, it is being the center of circle with the initial point, be on the circular arc of radius with each reference constellation point and initial point distance, the both sides of reference constellation point dispose an actual constellation point respectively, and its relative position is by the target root mean square phase error PhaseErr that presets _RmsCalculate and determine.At last, with the actual constellation point symmetry of first quartile be mapped to second and third, in the four-quadrant, namely can draw the base band planisphere that satisfies goal-selling root mean square phase error.

(3) when the target modulation error parameter be root-mean-square error amplitude of the vector EVM _RmsThe time, the method that disposes described base band planisphere is:

Step C3011, selecting modulation mode, goal-selling root-mean-square error amplitude of the vector EVM _Rms

Step C3012, according to selected modulation system, determine the relative position of reference constellation point;

Step C3013, according to the relative position of reference constellation point and default target root-mean-square error amplitude of the vector EVM _RmsDetermine actual constellation point position, draw and satisfy goal-selling root-mean-square error amplitude of the vector EVM _RmsThe base band planisphere.

As shown in Figure 6, solid dot is the reference constellation point, disposes four actual constellation points (hollow dots) around it.Its mid point C and some D are on the line of reference constellation point (solid dot) and initial point, and some B and some E are to be the center of circle with the initial point, are on the circular arc of radius with reference constellation point (solid dot) to the initial point distance.The relative position of these four actual constellation points (hollow dots) and reference constellation point (solid dot) has namely determined root-mean-square error amplitude of the vector EVM _RmsOn the contrary, if preset target root-mean-square error amplitude of the vector EVM _Rms, just can determine the relative position of four actual constellation points (hollow dots) according to the relative position of reference constellation point.Equally, if for selected modulation system, a plurality of reference constellation points are arranged in the first quartile, use similar method, dispose four actual constellation points around each reference constellation point, its relative position is by default target root-mean-square error amplitude of the vector EVM _RmsCalculate and determine.At last, with the actual constellation point symmetry of first quartile be mapped to second and third, in the four-quadrant, namely can draw the base band planisphere that satisfies goal-selling root-mean-square error amplitude of the vector.

Step 302: the base band planisphere that disposes is set to VSG by the mode of direct setting or the mode of program importing;

Usually, VSG has the function of User Defined IQ map, and the base band planisphere when using this function can the logarithm tone of Chinese characters processed carries out user-defined setting.Another kind mode more efficiently is to use the order line form, imports the base band planisphere of configuration by program.

Step 303: the modulation parameter of VSG is set, generates digital modulation signals, export from the VSG output;

Step 304: be that VSA arranges the demodulation parameter consistent with VSG, the digital modulation signals of VSG generation is input to the input of VSA, the demodulation mode of VSA is corresponding with the modulation system of VSG;

Step 305: measure vector modulation error MagErr by VSA _Rms, PhaseErr _RmsOr EVM _RmsMeasured value;

Following examples are to the present invention is directed to digital modulation mode QPSK (Quadrature Phase Shift Keying) the most frequently used in the modern wireless communication systems to use the embodiment that the digital modulation quality parameter metering method based on the setting of base band planisphere provided by the invention is carried out digital modulation quality parameter metering, and concrete steps are as follows:

Step 1: the target modulation error parameter according to default arranges the base band planisphere;

1. if the target modulation error parameter is rms amplitude error MagErr _Rms, then with reference to Fig. 4, the actual constellation point relative coordinate of configuration first quartile be (b, b), (c, c), wherein coordinate figure passes through following formula acquisition:

$b=\frac{-4+\sqrt{16-4{[2-{(2-{\mathrm{MagErr}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-{\mathrm{MagErr}}_{\mathrm{rms}}^2)}^2]}---\left(1\right)$

c＝1 (2)

Then the actual constellation point symmetry of first quartile is mapped to two, three, in the four-quadrant, obtain base band planisphere as shown in Figure 7, among the figure coordinate of eight actual constellation points be respectively (b, b), (c, c), (b, b), (c, c), (b ,-b), (c ,-c), (b,-b), (c ,-c).

2. if the target modulation error parameter is root mean square phase error PhaseErr _Rms, then with reference to Fig. 5, the actual constellation point coordinates of configuration first quartile be (b, c), (c, b), wherein coordinate figure is by the acquisition of following formula:

$b=\mathrm{tg}(\frac{\mathrm{\π}}{4}-\frac{\mathrm{\π}*{\mathrm{PhaseErr}}_{\mathrm{rms}}}{180})---\left(3\right)$

c＝1 (4)

Then the actual constellation point symmetry of first quartile is mapped to two, three, in the four-quadrant, obtain base band planisphere as shown in Figure 8, among the figure coordinate of eight actual constellation points be respectively (b, c), (c, b), (b, c), (c, b), (b ,-c), (c ,-b), (b,-c), (c ,-b).

3. if the target modulation error parameter is root-mean-square error amplitude of the vector EVM _Rms, then with reference to Fig. 6, the actual constellation point coordinates of configuration first quartile be (b, b), (c, c), (b, c), (c, b), wherein coordinate figure is by the acquisition of following formula:

$b=\frac{-4+\sqrt{16-4{[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}---\left(5\right)$

c＝1 (6)

Then the actual constellation point symmetry of first quartile is mapped to two, three, in the four-quadrant, obtains base band planisphere as shown in Figure 9, among the figure coordinate of 16 actual constellation points be respectively (b, b), (c, c), (b, c), (c, b), (b, b), (c, c), (b, c), (c, b), (b ,-b), (c ,-c), (b,-c), (c ,-b), (b ,-b), (c,-c), (b ,-c), (c ,-b).

Step 2: the base band planisphere that disposes is set to VSG by the mode of direct setting or the mode of program importing.Select for use the E4438C of Agilent company as VSG in the present embodiment, in this instrument, can directly carry out the setting of User Defined IQ map by instrument panel.Another kind is convenient mode more, mode by the program importing, the base band planisphere of configuration is set among the VSG, the software interface schematic diagram of the configuration module 110 that Figure 10 provides for the embodiment of the invention, the base band planisphere that configures can be input in the configuration module by this configuration module, again by configuration module by and VSG between the program introducting interface base band planisphere is imported among the VSG.It is the base band planisphere that imports VSG under rms amplitude error, root mean square phase error, three kinds of situations of root-mean-square error amplitude of the vector that Figure 11 (a), Figure 11 (b) and Figure 11 (c) are respectively the target modulation error parameter;

Step 3: the carrier frequency that VSG is set is 1GHz, and signal level is the root raised cosine type for-10dBm, filter, filter coefficient α=0.22, and code check is 2Msps.Generate digital modulation signals, export from the VSG output.This partial function can be integrated in configuration module 110 equally;

Step 4: the digital modulation signals that generates is input to the input of VSA, selects for use RS company to have the FSUP of VSA option as VSA in the present embodiment.The carrier frequency that VSA is set is that 1GHz, measurement filter are the root raised cosine type, and reference filter is the raised cosine type, α=0.22, and code check is 2Msps, and reference level is set to-5dBm, and demodulation mode is QPSK, and the planisphere type is NATURAL;

Step 5: in VSA, measure vector modulation error MagErr _Rms, PhaseErr _RmsOr EVM _Rms, the value that records and the target modulation error amount of presetting are compared, the result is as shown in table 1, and wherein error is that measured value deducts preset value:

Table 1

Data from table 1 as can be seen, MagErr _RmsThe absolute value of actual measured value and the value of setting deviation is smaller or equal to 0.67%, PhaseErr _RmsActual measured value and the value of setting absolute value of the bias be smaller or equal to 0.08 °, EVM _RmsActual measured value and the value of setting absolute value of the bias are smaller or equal to 0.20%.Hence one can see that, MagErr _Rms, PhaseErr _RmsAnd EVM _RmsThe value of setting and measured value good consistency is arranged.Thereby proved and utilized the method and system of the present invention can be to MagErr _Rms, PhaseErr _RmsAnd EVM _RmsThree modulation quality parameters arrange accurately and regulate.Method and system of the present invention can be used for the calibration operation to VSA, realizes the accuracy of measurement at VSA non-zero modulation error place is calibrated.In addition, method and system of the present invention can be used in the development of digital modulation quality parameter value comparison process transmission standard.

The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.

Claims (6)

1. digital modulation quality parameter metering method that arranges based on the base band planisphere is characterized in that this method comprises:

According to selected modulation system and default target modulation error parameter configuration base band planisphere;

Described base band planisphere is set among the VSG;

For VSG and VSA arrange consistent modulation parameter, the digital modulation signals that VSG is generated is input among the VSA;

Measure the measured value of vector modulation error by VSA;

The method that the modulation system that described basis is selected and default target modulation error parameter dispose the base band planisphere is:

Selecting modulation mode, goal-selling modulation error parameter value;

According to selected modulation system, determine the relative position of reference constellation point;

Relative position and default target modulation error parameter value according to reference constellation point are determined actual constellation point position, are met the base band planisphere of goal-selling modulation error parameter value;

Wherein, when described target modulation error parameter be rms amplitude error MagErr _RmsThe time, at two actual constellation points of each reference constellation point configuration, described actual constellation point is on the line of described reference constellation point and the origin of coordinates, and be distributed in described reference constellation point both sides, described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant.

2. method according to claim 1 is characterized in that, the relative coordinate of described two actual constellation points in first quartile (b, b), (c c) obtains by following formula:

$b=\frac{-4+\sqrt{16-4{[2-{(2-\mathrm{Mag}{\mathrm{Err}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-\mathrm{Mag}{\mathrm{Err}}_{\mathrm{rms}}^2)}^2]}$

c=1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

3. method according to claim 1 is characterized in that, when described target modulation error parameter is root mean square phase error PhaseErr _RmsThe time, at two actual constellation points of each reference constellation point configuration, described actual constellation point is being the center of circle with the origin of coordinates, putting origin of coordinates distance with described reference constellation is on the circular arc of radius, and be distributed in described reference constellation point both sides, described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant.

4. method according to claim 3 is characterized in that, the relative coordinate of described two actual constellation points in first quartile (b, c), (c b) obtains by following formula:

$b=\mathrm{tg}(\frac{\mathrm{\π}}{4}-\frac{\mathrm{\π}*{\mathrm{PhaseErr}}_{\mathrm{rms}}}{180})$

c=1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

5. method according to claim 1 is characterized in that, when described target modulation error parameter is root-mean-square error amplitude of the vector EVM _RmsThe time, at four actual constellation points of each reference constellation point configuration, wherein two actual constellation points are on the line of described reference constellation point and the origin of coordinates, two actual constellation points are being the center of circle with the origin of coordinates in addition, putting origin of coordinates distance with described reference constellation is on the circular arc of radius, and described actual constellation point is distributed in described reference constellation point both sides, and described actual constellation point and described reference constellation point are corresponding with selected modulation system in the number of each quadrant.

6. method according to claim 5 is characterized in that, the relative coordinate of described four actual constellation points in first quartile (b, b), (c, c), (b, c), (c b) obtains by following formula:

$b=\frac{-4+\sqrt{16-4{[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}^2}}{2[2-{(2-{\mathrm{EVM}}_{\mathrm{rms}}^2)}^2]}$

c=1

The actual constellation point of other three quadrants draws by the actual constellation point symmetry mapping of first quartile.

Images