WO2016101413A1 - Procédé et dispositif de détermination d'un paramètre de série d'amplitudes de vecteur d'erreur - Google Patents

Procédé et dispositif de détermination d'un paramètre de série d'amplitudes de vecteur d'erreur Download PDF

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Publication number
WO2016101413A1
WO2016101413A1 PCT/CN2015/073866 CN2015073866W WO2016101413A1 WO 2016101413 A1 WO2016101413 A1 WO 2016101413A1 CN 2015073866 W CN2015073866 W CN 2015073866W WO 2016101413 A1 WO2016101413 A1 WO 2016101413A1
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Prior art keywords
measurement signal
offset
signal
normalized
calculating
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PCT/CN2015/073866
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English (en)
Chinese (zh)
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汤卫东
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中兴通讯股份有限公司
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Publication of WO2016101413A1 publication Critical patent/WO2016101413A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field

Definitions

  • the invention relates to an optical communication technology, in particular to a method and a device for determining an error vector magnitude series parameter.
  • EVM Error Vector Magnitude
  • the EVM series parameters of the IEC specification also include the following parameters:
  • the amplitude error is as follows:
  • the angle error is as follows:
  • the In-phase Quadrature (IQ) gain imbalance is as follows:
  • the IQ offset is as follows:
  • the orthogonal angle error is as follows:
  • the IEC EVM series specification has the following disadvantages: the ideal signal and the normalized measurement signal power are different, resulting in inaccurate EVM; IQ gain imbalance does not remove the IQ offset, resulting in inaccurate IQ gain imbalance; and, quadrature phase The error calculation is too complicated.
  • embodiments of the present invention provide a method and apparatus for determining an error vector magnitude series parameter.
  • the embodiment of the invention provides a method for determining an error vector magnitude series parameter, the method comprising:
  • a quadrature phase error is calculated based on the canceled IQ offset measurement signal.
  • the normalizing the measured signal by the power to obtain the normalized measurement signal includes:
  • the calculating the EVM according to the normalized measurement signal and the ideal signal comprises:
  • the calculating the IQ offset according to the normalized measurement signal is:
  • the eliminating the IQ offset, and obtaining the IQ offset measurement signal includes:
  • the S 1 represents the cancel IQ offset measurement signal
  • the calculating the IQ gain imbalance according to the canceling the IQ offset measurement signal is:
  • Adopt formula An IQ gain imbalance is calculated, wherein the ⁇ represents the IQ gain imbalance.
  • the quadrature phase error is calculated as:
  • Adopt formula A quadrature phase error is calculated, wherein the ⁇ represents the quadrature phase error.
  • An embodiment of the present invention provides an apparatus for determining an error vector magnitude series parameter, where the apparatus includes:
  • a processing unit configured to normalize the measured signal by power to obtain a normalized measurement signal; and calculate an error vector magnitude EVM according to the normalized measurement signal and the ideal signal; according to the normalized measurement Signaling, calculating an IQ offset; eliminating the IQ offset, obtaining an IQ offset measurement signal; calculating an IQ gain imbalance according to the canceling the IQ offset measurement signal; and according to the eliminating the IQ offset measurement signal, The quadrature phase error is calculated.
  • the processing unit is configured to adopt a formula Normalizing the measurement signal by power to obtain a normalized measurement signal, wherein the S meas represents the normalized measurement signal, and the V meas represents the measurement signal, and the measurement signal is passed Obtaining the initial signal to be tested, wherein N is the number of samples of the measurement signal;
  • processing unit is configured to adopt a formula Calculating an IQ offset, wherein the IQ offset represents the IQ offset;
  • said S 1 represents said canceled IQ offset measurement signal;
  • Adopt formula An IQ gain imbalance is calculated, wherein the ⁇ represents the IQ gain imbalance.
  • processing unit is configured to adopt a formula A quadrature phase error is calculated, wherein the ⁇ represents the quadrature phase error.
  • the acquiring unit and the processing unit may use a central processing unit (CPU), a digital signal processor (DSP), or a programmable logic array (FPGA, Field-Programmable Gate) when performing processing. Array) implementation.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA programmable logic array
  • FPGA Field-Programmable Gate
  • the technical solution of the embodiment of the present invention includes: acquiring a measurement signal; normalizing the measurement signal according to power to obtain a normalized measurement signal; and calculating according to the normalized measurement signal and the ideal signal An error vector magnitude EVM; calculating an IQ offset according to the normalized measurement signal; eliminating the IQ offset to obtain an IQ offset measurement signal; and calculating an IQ gain according to the canceling the IQ offset measurement signal balance.
  • the invention adopts a method of normalizing the obtained measurement signals by power, avoiding the problem that the ideal signal and the normalized measurement signal power are different, improving the accuracy of the EVM; and, the IQ gain imbalance removes the IQ offset Thereby, the accuracy of the IQ gain imbalance is improved; moreover, the present invention overcomes the problem that the calculation of the quadrature phase error is too complicated in the prior art.
  • FIG. 1 is a schematic flow chart of an embodiment of a method for determining an error vector magnitude series parameter according to the present invention
  • Figure 2 is a 16QAM constellation diagram
  • Figure 3 is a QPSK constellation diagram
  • FIG. 4 is a schematic structural diagram of an embodiment of an apparatus for determining an error vector magnitude series parameter according to the present invention
  • FIG. 5 is an application example of an error vector magnitude series parameter determining apparatus provided by the present invention Schematic diagram of the structure.
  • the invention provides an error vector magnitude series parameter determining method, as shown in FIG. 1 , the method includes:
  • Step 101 Acquire a measurement signal.
  • the measurement signal is obtained by calibrating the initial signal to be tested
  • the initial signal to be tested may be calibrated by the receiver, including compensation for signal reception impairments and compensation of phase noise.
  • Step 102 normalize the measurement signal by power to obtain a normalized measurement signal
  • the measuring signal is normalized by power to obtain a normalized measurement signal, which is:
  • Adopt formula Normalizing the measurement signal by power to obtain a normalized measurement signal wherein the S meas represents the normalized measurement signal, the V meas represents the measurement signal, and the N is the The number of samples of the measured signal;
  • normalization is the basis of the EVM series parameter calculation, and normalization by power can ensure that the measured signal has the same power as the ideal signal.
  • the number of samples of the measurement signal can be more than 10,000.
  • Step 103 calculating an error vector magnitude EVM according to the normalized measurement signal and the ideal signal
  • the calculating the EVM according to the normalized measurement signal and the ideal signal is:
  • Adopt formula Calculating an error vector magnitude EVM, wherein the S ideal represents the ideal signal
  • the normalized ideal signal of QPSK is The ideal signal for 16QAM is
  • the ideal signal refers to an ideal signal corresponding to the measurement signal obtained by calibrating the initial signal to be tested, instead of an ideal signal corresponding to the initial signal to be tested.
  • Figure 2 is a 16QAM constellation diagram in which the linear value of the IQ gain imbalance is 0.75 and the orthogonal angle error is 10 degrees. The constellation point in the upper right corner is taken as an example.
  • the ideal signal should be If the processing is performed according to the ideal signal corresponding to the initial signal to be tested, some signals may fall into Cause calculation errors.
  • the EVM described in the present invention includes a root mean square value and an instantaneous value.
  • the QPSK modulated signal can be simplified to:
  • the 16QAM modulated signal can be simplified to:
  • the real representation takes the real part of the complex number, the imag represents the imaginary part of the complex number, the ⁇ > represents an average value, and the
  • the amplitude error is calculated as follows:
  • phase error is calculated as follows:
  • Step 104 Calculate an IQ offset according to the normalized measurement signal.
  • the calculating the IQ offset according to the normalized measurement signal is:
  • Adopt formula An IQ offset is calculated, wherein the IQ offset represents the IQ offset, the real representation takes the real part of the complex number, the imag represents the imaginary part of the complex number, and the ⁇ > represents the average.
  • Step 105 Eliminate the IQ offset, and obtain an IQ offset measurement signal.
  • the eliminating the IQ offset and obtaining the IQ offset measurement signal are:
  • S 1 represents the cancellation IQ offset measurement signal.
  • Step 106 Calculate an IQ gain imbalance according to the canceling the IQ offset measurement signal.
  • the calculating the IQ gain imbalance according to the canceling the IQ offset measurement signal is:
  • Adopt formula An IQ gain imbalance is calculated, wherein the ⁇ represents the IQ gain imbalance.
  • Step 107 Calculate a quadrature phase error according to the canceling the IQ offset measurement signal.
  • the calculating the quadrature phase error according to the canceling the IQ offset measurement signal is:
  • Adopt formula Calculating a quadrature phase error where ⁇ represents the quadrature phase error and the (.) represents an inner product operation, with The unit vectors of the real and imaginary parts of the IQ offset measurement signal are respectively indicated.
  • the mathematical model of the IQ offset, the IQ gain imbalance, and the quadrature phase error in the embodiment of the present invention is as follows, where [I Q] is an ideal signal, [I' Q'] is a damaged signal; ⁇ is an IQ gain. Unbalanced, ⁇ is the quadrature phase error, I0 is the I offset, and Q0 is the Q offset.
  • the I and Q offsets are averaged separately for the I and Q components, then the squared average is used, and finally converted to dB.
  • the IQ gain imbalance and quadrature phase error calculation can be performed after the IQ offset is removed.
  • the square of the I signal and the Q signal are averaged, and then the ratio is the IQ gain imbalance, which can be converted into a dB value.
  • the IQ gain imbalance can also be taken as an absolute value.
  • the cosine of the angle between the unit vector I signal and the unit vector Q signal is the result of the inner product calculation, so the sine value of the inner product calculation is the quadrature phase error of IQ.
  • I in-phase signal data
  • Q quadrature phase signal data
  • the signal can be expressed as [I Q], or I+i*Q, where i represents an imaginary number, ie, the phases are 90 degrees out of phase.
  • step 106 and the step 107 is not limited in this embodiment.
  • Figure 3 shows the QPSK constellation.
  • the signal has damage caused by modulators such as Gaussian noise, IQ offset, IQ gain imbalance and quadrature phase error.
  • the IQ gain imbalance is set to 0.5 during simulation. Linear value), the quadrature phase error is 15 degrees, the data sample is 10000, the power normalization is first performed, then the IQ offset is eliminated, and the linear value of the IQ gain imbalance is calculated by the formula of the present invention is 0.5007, The cross phase error is 14.8627 degrees.
  • Embodiments of the present invention provide an error vector magnitude series parameter determining apparatus, and the error vector magnitude series parameter determining apparatus may be integrated in a receiver or may be separately set.
  • the receiver first receives an input signal, which may be delayed interference reception or coherent reception; then, photoelectrically converting the input signal to obtain an initial signal to be tested; and then calibrating the initial signal to be measured to obtain a measurement a signal, the calibration comprising compensating for signal reception impairments and compensating phase noise, the compensation signal reception impairments may include IQ offset compensation, IQ gain imbalance compensation, IQ quadrature error compensation, etc., the phase noise is a transmitter laser line Widened.
  • the device includes:
  • the obtaining unit 401 is configured to acquire a measurement signal
  • the acquisition unit 401 can acquire a measurement signal from the receiver.
  • the processing unit 402 is configured to: normalize the measurement signal by power to obtain a normalized measurement signal; calculate an error vector magnitude EVM according to the normalized measurement signal and the ideal signal; according to the normalization
  • the measurement signal is obtained, the IQ offset is calculated; the IQ offset is eliminated, and the IQ offset measurement signal is obtained; and the IQ gain imbalance is calculated according to the canceled IQ offset measurement signal.
  • the processing unit 402 is further configured to calculate a quadrature phase error according to the cancel IQ offset measurement signal.
  • the processing unit 402 is specifically configured to adopt a formula Normalizing the measurement signal by power to obtain a normalized measurement signal, wherein the S meas represents the normalized measurement signal, and the V meas represents the measurement signal, and the measurement signal is passed Obtaining the initial signal to be tested, wherein N is the number of samples of the measurement signal;
  • the processing unit 402 is configured to adopt a formula Calculating an IQ offset, wherein the IQ offset represents the IQ offset, the real representation takes the real part of the complex number, the imag represents the imaginary part of the complex number, and the ⁇ > represents an average value;
  • said S 1 represents said canceled IQ offset measurement signal;
  • Adopt formula An IQ gain imbalance is calculated, wherein the ⁇ represents the IQ gain imbalance.
  • the processing unit 402 is configured to adopt a formula Calculating a quadrature phase error, where ⁇ represents the quadrature phase error and the (.) represents an inner product operation, with The unit vectors of the real and imaginary parts of the IQ offset measurement signal are respectively indicated.
  • the detecting unit of the receiver receives an input signal and photoelectrically converts the input signal to obtain an initial signal to be tested, and the receiving may be delayed interference receiving or coherent receiving; the receiver
  • the calibration unit calibrates the initial signal to be tested to obtain a measurement signal, the calibration includes compensating for signal reception impairment and compensating phase noise, and the compensation signal reception impairment may include IQ offset compensation and IQ gain imbalance generated by the receiver. Compensation, IQ quadrature error compensation, etc., which is caused by the transmitter laser linewidth.
  • the acquiring unit of the error vector magnitude series parameter determining apparatus acquires the measurement signal, and the processing unit of the apparatus determines the EVM series parameter according to the measurement signal.
  • the invention is applicable to a single polarization signal and a polarization multiplexed signal; the X polarization state and the Y polarization state of the polarization multiplexed signal are calculated by the same formula.
  • the EVM series parameters in the invention may include: EVM, amplitude error, phase error, IQ offset, IQ gain imbalance, quadrature phase error.
  • EVM amplitude error
  • phase error phase error
  • IQ offset IQ offset
  • IQ gain imbalance quadrature phase error
  • quadrature phase error mainly comes from the 90 degree phase control error of the Mach-Zehnder modulator.
  • the IQ gain imbalance mainly comes from The amplitude error of the modulator I and Q drivers.
  • the EVM series parameters may also include IQ skew.
  • the IQ delay mainly comes from the delay error of the modulator optical path and/or the electrical signal, and the existing eye diagram is used to test the intersection time of the I and Q data respectively.
  • the calculation method calculates the intersection time of I and Q, and the difference is IQ skew, which is a mature practical solution, so the present invention does not refer to it.
  • the technical solution of the embodiment of the present invention includes: acquiring a measurement signal; The quantity signal is normalized by power to obtain a normalized measurement signal; the error vector magnitude EVM is calculated according to the normalized measurement signal and the ideal signal; and the IQ offset is calculated according to the normalized measurement signal; Eliminating the IQ offset, an IQ offset measurement signal is obtained; and an IQ gain imbalance is calculated according to the cancel IQ offset measurement signal.
  • the invention adopts a method of normalizing the obtained measurement signals by power, avoiding the problem that the ideal signal and the normalized measurement signal power are different, improving the accuracy of the EVM; and, the IQ gain imbalance removes the IQ offset , thereby improving the accuracy of the IQ gain imbalance.
  • the present invention overcomes the problem of too complicated calculation of orthogonal angle errors in the prior art.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the invention adopts a method of normalizing the obtained measurement signals by power, avoiding the problem that the ideal signal and the normalized measurement signal power are different, improving the accuracy of the EVM; and, the IQ gain imbalance removes the IQ offset Thereby, the accuracy of the IQ gain imbalance is improved; moreover, the present invention overcomes the problem that the calculation of the quadrature phase error is too complicated in the prior art.

Abstract

L'invention concerne un procédé et un dispositif permettant de déterminer un paramètre de série d'amplitudes de vecteur d'erreur (EVM). Le procédé consiste à : acquérir un signal de mesure ; normaliser le signal de mesure en fonction de la puissance pour obtenir un signal de mesure normalisé ; selon le signal de mesure normalisé et un signal idéal, effectuer des calculs pour à obtenir l'amplitude de vecteur d'erreur ; selon le signal de mesure normalisé, effectuer des calculs pour obtenir un décalage en quadrature de phase (IQ) ; éliminer le décalage en quadrature de phase (IQ) pour obtenir un signal de mesure à décalage en quadrature de phase (IQ) éliminé ; selon le signal de mesure à décalage en quadrature de phase (IQ) éliminé, effectuer des calculs pour obtenir un déséquilibre de gains en quadrature de phase (IQ) ; et selon le signal de mesure à décalage en quadrature de phase (IQ) éliminé, effectuer des calculs pour obtenir une erreur de phase de quadrature.
PCT/CN2015/073866 2014-12-22 2015-03-09 Procédé et dispositif de détermination d'un paramètre de série d'amplitudes de vecteur d'erreur WO2016101413A1 (fr)

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