WO2019028702A1 - Méthode de traitement de pilote, appareil et système - Google Patents

Méthode de traitement de pilote, appareil et système Download PDF

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Publication number
WO2019028702A1
WO2019028702A1 PCT/CN2017/096652 CN2017096652W WO2019028702A1 WO 2019028702 A1 WO2019028702 A1 WO 2019028702A1 CN 2017096652 W CN2017096652 W CN 2017096652W WO 2019028702 A1 WO2019028702 A1 WO 2019028702A1
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WIPO (PCT)
Prior art keywords
frequency
receiving end
points
point
signal
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PCT/CN2017/096652
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English (en)
Chinese (zh)
Inventor
马雅男
周谞
邓宁
董振华
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2017/096652 priority Critical patent/WO2019028702A1/fr
Priority to CN201780089071.5A priority patent/CN110463080B/zh
Publication of WO2019028702A1 publication Critical patent/WO2019028702A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers

Definitions

  • the present application relates to the field of optical communication technologies, and in particular, to a pilot processing method, apparatus, and system.
  • DWDM Dense Wavelength Division Multiplexing
  • the center frequency drift of the signal transmitted by the transmitting end in optical communication can reach +/- 2.5 GHz, and the light transmitted between the two nodes of the ring network or the point-to-multipoint master node and the access node in the optical transmission network
  • the center frequency of the signal sent by the transmitting end cannot be completely aligned with the center frequency of the filtering channel of the receiving end, so that the transmission performance is seriously affected, which affects the communication quality.
  • the existing method for correcting the frequency can determine the power of the left and right sideband pilots in the spectrum signal by determining the spectrum signal of the received optical signal, and then calculate the center frequency of the signal sent by the transmitting end according to the power of the left and right sideband pilots.
  • the embodiment of the present application provides a pilot processing method, apparatus, and system, and provides an effective manner for determining a pilot position.
  • the embodiment of the present application provides a pilot processing method, including: receiving, by a receiving end, Fourier transform processing on an obtained electrical signal to obtain a spectrum signal; and determining, by the receiving end, a pre-determined in the spectrum signal And setting a magnitude corresponding to the first frequency point in the frequency range and a sum of the amplitudes corresponding to the second frequency point, wherein the first frequency point and the second frequency point are any within the preset frequency range
  • the frequency difference is two frequency points of the first frequency interval; the first frequency interval is equal to a frequency interval between two pilots in the optical signal transmitted by the predetermined transmitting end; the receiving end is according to the preset frequency
  • the sum of the two frequency points of the first frequency interval at any frequency within the range is used to locate the pilot position, thereby realizing the position where the accurate positioning pilot is located.
  • the receiving end locates the pilot position according to the sum of the two frequency points of the first frequency interval at any frequency in the preset frequency range, which may be implemented by: receiving The terminal positions the two frequency points with the highest neutralization value in the preset frequency range as pilots.
  • the receiving end locates the pilot position according to the sum of the two frequency points of the first frequency interval at any frequency in the preset frequency range, and may also be implemented as follows:
  • the receiving end determines a first average value of the amplitude corresponding to 2N frequency points in the frequency point of the first frequency point not greater than the frequency point of the second frequency interval, and determines a frequency with the second frequency point Interval not greater than the second a second average of the amplitudes corresponding to the 2M frequency points in the frequency interval; the M and N are positive integers; each of the 2N frequency points and the first frequency point The frequency interval is equal, the frequency interval of each of the 2M frequency points is equal to the frequency of the second frequency point; the receiving end sets the amplitude corresponding to the first frequency point and the second frequency point a sum of the corresponding amplitudes, subtracting the first average value and subtracting the second average value to obtain a difference between the first frequency point and the second frequency point; the receiving end is the preset frequency The two frequency points with the highest difference in the range are positioned as pilots.
  • the amplitude corresponding to each frequency point is subtracted from the influence of the surrounding noise signal, thereby improving the accuracy of the positioning pilot.
  • the receiving end performs Fourier transform processing on the obtained electrical signal to obtain a spectrum signal, including: the receiving end performs the Futing of the two polarization signals included in the electrical signal by: The Fourier transform process produces the spectral signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the method of spectral square addition is used to overcome the influence of polarization rotation on the pilot amplitude, thereby improving the accuracy of the positioning pilot.
  • the method may further include: The receiving end determines a frequency offset between the signal received by the receiving end and the filtering channel of the receiving end based on a difference between amplitudes corresponding to two frequency points determined as pilots.
  • the receiving end may send the determined frequency offset to the transmitting end, so that the transmitting end adjusts the center frequency of the transmitting signal based on the frequency offset.
  • the method further includes: the receiving Determining, according to a frequency of two frequency points determined as pilots, a center frequency of the optical signal to be processed; and determining, by the receiving end, a difference between a center frequency of the optical signal to be processed and a local frequency of the receiving end The local frequency is biased.
  • the preset frequency range is determined in advance based on the maximum frequency offset of the receiving end and the signal bandwidth sent by the transmitting end, and the preset frequency range is determined to be more accurate by the above manner, thereby determining the guide.
  • the frequency position is more accurate.
  • the embodiment of the present application provides a pilot processing method, including:
  • the receiving end performs Fourier transform processing on the obtained electrical signal to obtain a spectrum signal.
  • the receiving end determines a third average value of the amplitude corresponding to 2N frequency points in the frequency point of the third frequency point in the preset frequency range is not greater than the frequency point of the second frequency interval.
  • the N is a positive integer; each of the 2N frequency points is equal to a frequency interval of the third frequency point.
  • the receiving end subtracts the amplitude corresponding to the third frequency point from the first average value to obtain a difference corresponding to the third frequency point, so that the receiving end has the highest difference in the preset frequency range.
  • the frequency point is positioned as a pilot, wherein the third frequency point is any frequency point within the preset frequency range.
  • the receiving end determines the position of the other pilot based on the frequency interval between the two pilots in the optical signal transmitted by the predetermined transmitting end.
  • the receiving end performs Fourier transform processing on the electrical signal to obtain a spectrum signal, including: the receiving end performs Fuli on the two polarization signals included in the electrical signal by: The leaf transform process yields the spectral signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the method of spectral square addition is used to overcome the influence of polarization rotation on the pilot amplitude, thereby improving the accuracy of the positioning pilot.
  • the method further includes: the receiving end determining the receiving based on a difference between amplitudes corresponding to two frequency points determined as pilots.
  • the frequency offset between the signal received by the terminal and the filtering channel of the receiving end can be determined based on the determined pilot.
  • the method further includes: the receiving end determining the optical signal to be processed based on a frequency of two frequency points determined as pilots. a center frequency; the receiving end determines a local frequency offset based on a difference between a center frequency of the optical signal to be processed and a local frequency of the receiving end.
  • the preset frequency range is determined in advance based on the maximum frequency offset of the receiving end and the signal bandwidth sent by the transmitting end, and the preset frequency range is determined to be more accurate by the above manner, thereby determining the guide.
  • the frequency position is more accurate.
  • the embodiment of the present application provides a pilot processing apparatus, where the apparatus is applied to a receiving end, and includes:
  • a Fourier transform unit configured to perform a Fourier transform process on the acquired electrical signal to obtain a spectrum signal
  • a positioning unit configured to determine a sum of a magnitude corresponding to a first frequency point and a magnitude corresponding to a second frequency point in a preset frequency range in the spectral signal, wherein the first frequency point and the The second frequency point is two frequency points of any frequency in the preset frequency range that are different by the first frequency interval; the first frequency interval is equal to between the two pilots in the optical signal transmitted by the predetermined transmitting end a frequency interval; positioning a pilot position according to a sum of two frequency points of the first frequency interval that are different in any frequency within the preset frequency range.
  • the preset frequency range is determined in advance based on a maximum frequency offset of the receiving end and a signal bandwidth sent by the transmitting end.
  • the positioning unit is configured to: when the pilot position is located according to the sum of two frequency points of the first frequency interval at any frequency within the preset frequency range, specifically:
  • the two frequency points with the highest sum of the preset frequency ranges are located to the pilot.
  • the positioning unit is configured to: when the pilot position is located according to the sum of two frequency points of the first frequency interval at any frequency within the preset frequency range, specifically:
  • the Fourier transform unit when performing Fourier transform processing on the electrical signal to obtain a spectrum signal, is specifically used to: include two polarizations of the electrical signal by: The signal is subjected to Fourier transform processing to obtain a spectral signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the positioning unit is further configured to: after determining a pilot position according to a sum of two frequency points of the first frequency interval that are different according to the preset frequency range, The difference between the amplitudes of the two frequency points of the pilot determines the frequency offset between the signal received by the receiving end and the filtering channel of the receiving end.
  • the positioning unit is further configured to: after determining a pilot position according to a sum of two frequency points of the first frequency interval that are different according to the preset frequency range, The frequency of the two frequency points of the pilot determines the center frequency of the optical signal to be processed; and determines the local frequency offset based on the difference between the center frequency of the optical signal to be processed and the local frequency of the receiving end.
  • the embodiment of the present application provides a pilot processing method, including:
  • a Fourier transform unit is configured to perform a Fourier transform process on the obtained electrical signal to obtain a spectrum signal.
  • a positioning unit configured to determine a third average value of the amplitude corresponding to 2N frequency points in the frequency point of the third frequency point in the preset frequency range not greater than the frequency point of the second frequency interval.
  • the N is a positive integer; each of the 2N frequency points is equal to a frequency interval of the third frequency point.
  • the third frequency point is any frequency point within the preset frequency range.
  • the position of the other pilot is then determined based on a predetermined frequency interval between the two pilots in the optical signal transmitted by the transmitting end.
  • the Fourier transform unit performs Fourier transform processing on the electrical signal to obtain a spectrum signal, including: performing Fu Fu on the two signals included in the electrical signal by:
  • the Fourier transform process produces the spectral signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the method of spectral square addition is used to overcome the influence of polarization rotation on the pilot amplitude, thereby improving the accuracy of the positioning pilot.
  • the positioning unit is further configured to determine, according to the difference between the amplitudes corresponding to the two frequency points determined as the pilot, the signal received by the receiving end Frequency offset between the filtering channels of the receiving end.
  • the frequency offset between the signal received by the receiving end and the filtering channel of the receiving end can be determined based on the determined pilot.
  • the positioning unit is further configured to: determine a center frequency of the to-be-processed optical signal based on a frequency of two frequency points determined as pilots; The difference between the center frequency of the processed optical signal and the local oscillator frequency of the receiving end determines the local frequency offset.
  • the preset frequency range is determined in advance based on the maximum frequency offset of the receiving end and the signal bandwidth sent by the transmitting end, and the preset frequency range is determined to be more accurate by the above manner, thereby determining the guide.
  • the frequency position is more accurate.
  • an embodiment of the present application provides a pilot processing apparatus, where the apparatus is applied to a receiving end, the apparatus includes a memory and a processor, and the memory is configured to store a program executed by the processor; A processor for executing the program stored in the memory to perform the method of any one of the first aspect or the second aspect.
  • the embodiment of the present application further provides a pilot processing system, where the system includes a receiving end and a transmitting end.
  • the transmitting end is configured to send an optical signal to the receiving end, where the optical signal includes a to-be-transmitted signal and a pilot signal, and the receiving end is configured to receive the optical signal sent by the transmitting end Converting to an electrical signal, and performing Fourier transform processing on the electrical signal to obtain a spectral signal; determining a magnitude corresponding to the first frequency point in the preset frequency range in the spectral signal and corresponding to the second frequency point a sum of magnitudes, wherein the first frequency point and the second frequency point are two frequency points of any frequency difference between the preset frequency ranges and the first frequency interval; the first frequency interval is equal to Determining a frequency interval between two pilots in the optical signal transmitted by the transmitting end; positioning the pilot position according to a sum of two frequency points of the first frequency interval at any frequency within the preset frequency range; Determining, by the difference between the amplitudes of the two frequency points of the pilot, a frequency offset between the to-be-transmitted signal sent by the transmitting end and the filtering channel
  • the transmitting end adjusts a center frequency of the to-be-transmitted signal based on the received frequency offset.
  • the receiving end is configured to: when the pilot position is located according to the sum of two frequency points of the first frequency interval at any frequency within the preset frequency range, specifically for: The terminal positions the two frequency points with the highest neutralization value in the preset frequency range as pilots.
  • the receiving end is configured to: when the pilot position is located according to the sum of two frequency points of the first frequency interval at any frequency within the preset frequency range, specifically:
  • the receiving end determines a first average value of the amplitude corresponding to 2N frequency points in the frequency point of the first frequency point not greater than the frequency point of the second frequency interval, and determines a frequency with the second frequency point
  • the interval is not greater than a second average of amplitudes corresponding to 2M frequency points of the frequency points of the second frequency interval; the M and N are positive integers; and each of the 2N frequency points is The frequency spacing of the first frequency point is equal, and the frequency interval of each of the 2M frequency points is equal to the frequency of the second frequency point; the receiving end is the amplitude corresponding to the first frequency point.
  • the receiving The terminal locates two frequency points with the highest difference among the preset frequency ranges as pilots.
  • the amplitude corresponding to each frequency point is subtracted from the influence of the surrounding noise signal, thereby improving the accuracy of the positioning pilot.
  • the receiving end is configured to perform a Fourier transform process on the electrical signal to obtain a spectral signal, and is specifically used by: the receiving end, the two polarized signals included in the electrical signal are: Performing a Fourier transform process to obtain a spectral signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the method of spectral square addition is used to overcome the influence of polarization rotation on the pilot amplitude, thereby improving the accuracy of the positioning pilot.
  • the receiving end is further configured to: after determining a pilot position according to a sum of two frequency points of the first frequency interval that are different according to the preset frequency range, The frequency of the two frequency points of the pilot determines the center frequency of the optical signal to be processed; the receiving end determines the local frequency offset based on the difference between the center frequency of the optical signal to be processed and the local frequency of the receiving end The receiving end adjusts the local oscillator frequency.
  • the preset frequency range is determined in advance based on the maximum frequency offset of the receiving end and the signal bandwidth sent by the transmitting end, and determining the preset frequency range is more accurate by the above manner, thereby determining The pilot position is more accurate.
  • the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the second when being read and executed by one or more processors Any of the aspects provided by the design.
  • an embodiment of the present application provides a computer program product comprising instructions, when executed on a computer, causing a computer to perform the method provided by any one of the above first aspect or the second aspect.
  • FIG. 1 is a structural diagram of an optical communication system according to an embodiment of the present application.
  • 2A is a schematic diagram of a deviation of a signal after filtering according to an embodiment of the present application.
  • 2B is a schematic diagram of a left-side deviation generated after filtering a signal according to an embodiment of the present application
  • 2C is a schematic diagram of generating a rightward deviation after signal filtering according to an embodiment of the present application.
  • FIG. 3 is a flowchart of a method for processing a pilot according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of sliding window detection according to an embodiment of the present application.
  • FIG. 5 is a flowchart of a method for processing a pilot according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of pilot positioning provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a pilot positioning process according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of determining a frequency offset according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a sending end according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a sending end according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a sending end according to an embodiment of the present disclosure.
  • an optical communication system provided by an embodiment of the present application is used for pilot processing, where the system includes a transmitting end and a receiving end.
  • the transmitting end is configured to modulate data onto the optical signal and emit;
  • the receiving end is configured to receive the optical signal, and the local oscillator optical signal generated by the local oscillator laser is coherently detected with the received optical signal, and then switched by using wavelength selection (wavelength) -selective switch WSS) Filters the technology to filter and finally demodulate the raw data from the filtered signal.
  • WSS wavelength selection
  • the center frequency drift of the signal transmitted by the transmitting end in optical communication can reach +/-2.5 GHz. Since the center frequency of the signal sent by the transmitting end cannot be completely aligned with the center frequency of the filtering channel of the receiving end, the transmission performance is seriously affected. , affecting the quality of communication.
  • the existing methods of correcting the frequency are mainly as follows:
  • the transmitting end asymmetrically adds two pilot components to the left and right sides of the signal to be transmitted, and then sends the same to the receiving end.
  • the center frequency of the filtered signal cannot be completely aligned with the center frequency of the signal sent by the transmitting end, which is called generating offset. (offset).
  • the offset acts on the pilot component.
  • the coherent detector detects, the amplitude of the pilot component generated by the beat frequency decreases as the offset increases. Referring to FIG. 2A, FIG. 2B, and FIG. 2C, the spectrum signal is filtered by a filter.
  • the spectrum signal indicates the amplitude corresponding to each frequency point in the frequency band in which the signal is located, and the amplitude corresponding to each frequency point indicates the energy of the signal at the frequency corresponding to the frequency point.
  • the receiving end detects the frequency of the left and right sideband pilots, and then calculates the frequency offset according to the power of the left and right sideband pilots, but since the local oscillator laser drifts and the drift size cannot be fixed, the pilot is made. The location is not fixed, and there is no effective way to determine the pilot position.
  • the present application can also be applied to an ultra-dense wavelength division system.
  • the core node included in the ultra-dense wavelength division system uses a coherent transceiver, and the edge node uses a coherent receiver.
  • the embodiment of the present application provides a method, a device, and a system for processing a pilot, which are used to solve the problem of the inaccurate pilot position in the prior art.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.
  • FIG. 3 is a flowchart of a method for processing a pilot according to an embodiment of the present application.
  • the receiving end performs Fourier transform processing on the obtained electrical signal to obtain a spectrum signal.
  • the transmitting end asymmetrically adds two pilot components to the left and right sides of the to-be-transmitted signal, and then sends the same to the receiving end. After receiving the optical signal sent by the transmitting end, the receiving end obtains an electrical signal corresponding to the optical signal by photoelectric conversion, so that the receiving end acquires the electrical signal.
  • the receiving end determines a sum of a magnitude corresponding to the first frequency point and a magnitude corresponding to the second frequency point in a preset frequency range in the spectrum signal.
  • the first frequency point and the second frequency point are two frequency points of any frequency difference within a range of the first frequency interval, and the first frequency interval is equal to a predetermined transmitting end. a frequency interval between two pilots in the transmitted optical signal; the first frequency interval being greater than the second frequency interval.
  • the receiving end locates a pilot position according to a sum of two frequency points of the first frequency interval that are different in any frequency within the preset frequency range.
  • step S303 the receiving end locates the pilot position according to the sum of two frequency points of the first frequency interval at any frequency in the preset frequency range, which can be implemented as follows:
  • the receiving end positions two frequency points in the preset frequency range and the highest value as pilots.
  • the two frequency points of the first frequency interval of the frequency difference form a pair of frequency points, and the sum value corresponding to each pair of frequency points in the preset frequency range is obtained by the above manner, thereby determining the pair of frequency points with the highest sum value as Pilot.
  • the preset frequency range may be determined based on a maximum frequency offset of the receiving end and a signal bandwidth sent by the transmitting end.
  • the maximum frequency offset of the receiving end is ⁇ 2.5G
  • the bandwidth of the signal transmitted by the transmitting end is 8G
  • the frequency interval of the two pilots inserted on both sides of the signal is 10G, so that the determined preset frequency range can be 15GHz.
  • the receiving end determines a frame corresponding to the first frequency point in a preset frequency range in the spectrum signal.
  • the value and the sum of the amplitudes corresponding to the second frequency point can be realized by sliding the window.
  • the preset frequency range is the scanning area
  • the first frequency interval is the sliding window size.
  • the scanning can be performed in the order of the preset frequency range from small to large or from large to small.
  • the following is an example of scanning from small to large:
  • ⁇ f represents the second frequency interval.
  • the first frequency point on the left side of the scanning area is taken as the starting point, so the two frequency points covered by the sliding window A point and B point are the frequency point 1 and the frequency point 2, and the frequency interval between the frequency point 1 and the frequency point 2 It is ⁇ f, and thus the amplitudes of the frequency point 1 and the frequency point 2 are added.
  • move point A and point B and calculate the sum of the amplitude of the frequency covered by point A and the frequency of point covered by point B until point B reaches the frequency with the highest frequency in the scanning area, as shown in Figure 4.
  • Point 3 and frequency 4 the sum of the amplitudes of frequency 3 and frequency 4 is calculated, and the scanning ends. After the above scanning process, the calculated two frequency points with the highest sum value can be positioned as pilots.
  • the highest sum is the sum of the energy of the two pilots, and the specific coordinates of the frequency point at which the pilot is located can be determined according to the position where the highest sum value appears.
  • the energy around the signal to be received may be higher than the energy of the pilot signal, thereby affecting the position of the determined pilot. Therefore, after determining the amplitude corresponding to each frequency point, the frequency is taken. A plurality of frequency points in a certain area on both sides of the point, the average value of the energy of the plurality of frequency points is obtained, and then the energy of the frequency point is subtracted, and the subtracted energy is used as the energy of the frequency point, which can reduce the noise to determine The impact of the pilot position.
  • step S303 the receiving end locates the pilot position according to the sum of two frequency points of the first frequency interval at any frequency in the preset frequency range, and may also be implemented as follows: :
  • the receiving end determines a first average value of a magnitude corresponding to 2N frequency points of a frequency point of the first frequency point not greater than a frequency point of the second frequency interval, and determining and the second frequency point The frequency interval is not greater than a second average of the amplitudes corresponding to 2M frequency points of the frequency points of the second frequency interval.
  • the M and N are both positive integers; each of the 2N frequency points is equal to the frequency interval of the first frequency point, and each of the 2M frequency points is the same as the first The frequency spacing of the two frequency points is equal.
  • the receiving end subtracts the first average value and subtracts the second average value from a sum of a magnitude corresponding to the first frequency point and a magnitude corresponding to the second frequency point.
  • the receiving end locates two frequency points with the highest difference among the preset frequency ranges as pilots.
  • the second frequency interval may range from 10 to 80 points.
  • a first average value of the amplitude corresponding to the 2N frequency points is selected from a frequency point where the frequency interval of the first frequency point is not greater than the second frequency interval, the 2N frequency points form a pair for each of the two frequency points.
  • each frequency point of each pair of frequency points is equal to a frequency interval of the first frequency point, for example, selecting a frequency point on the left side of the first frequency point and a frequency point of 10 points at the first frequency point and at the first
  • the distance from the right side of the frequency point to the first frequency point is 1 frequency point of 10 points, thereby determining the average value of the amplitudes of the two frequency points to obtain a first average value; for example, selecting the distance to the left of the first frequency point
  • the first frequency point is two frequency points of 10 o'clock and 9 o'clock, and the two frequency points of the first frequency point are 10 o'clock and 9 o'clock at the right side of the first frequency point, thereby determining the amplitude of the four frequency points.
  • the average of the values gives the first average.
  • the amplitude of the frequency point a is A
  • the frequency point at which the distance from the frequency point a is the first frequency interval in the preset frequency range is the frequency point b
  • the amplitude of the frequency point b is B.
  • the sum of the frequency point a and the frequency point b is A+B
  • the frequency between the left side of the frequency point a and the frequency point a is 10 points and 8 points
  • the frequency point is the frequency point a1 and the frequency point.
  • the frequency between the frequency point a and the frequency point a is 10 points and 8 points
  • the frequency point is the frequency point a4 and the frequency point a3, the amplitude of the frequency point a1, the amplitude of the frequency point a2, and the frequency
  • the amplitude of the point a3 and the average value of the amplitude of the frequency point a4 are C;
  • the frequency points of the left side of the frequency point b and the frequency of the frequency point b are 10 points and 8 points, respectively, the frequency point b1 and the frequency point b2,
  • the frequency points on the right side of the frequency point b and the frequency of the frequency point b are 10 points and 8 points, respectively, the frequency point b4 and the frequency point b3, the amplitude of the frequency point b1, the amplitude of the frequency point b2, and the frequency point b3
  • the average value of the amplitude and the amplitude of the frequency point b4 is D; thus the amplitude A of the frequency point a is
  • the receiving end performs Fourier transform processing on the obtained electrical signal to obtain a spectrum signal.
  • the receiving end determines a third average value of the amplitude corresponding to 2N frequency points in the frequency point of the third frequency point in the preset frequency range is not greater than the frequency point of the second frequency interval.
  • the N is a positive integer; each of the 2N frequency points is equal to a frequency interval of the third frequency point.
  • the second frequency interval is a preset value.
  • the receiving end subtracts the first average value from the amplitude corresponding to the third frequency point to obtain a difference corresponding to the third frequency point, so that the receiving end selects the difference in the preset frequency range.
  • the frequency point with the highest value is positioned as a pilot, and the position of the other pilot is determined based on the frequency interval between the two pilots in the optical signal transmitted by the predetermined transmitting end.
  • the third frequency point is any frequency point within the preset frequency range.
  • the second frequency interval can range from 10 to 80 points.
  • the receiving end determines that the frequency interval of the third frequency point in the preset frequency range is not greater than the third average value of the amplitude corresponding to the 2N frequency points in the frequency point of the second frequency interval, and each of the 2N frequency points is two
  • the frequency points form a pair of frequency points, and each of the frequency points has the same frequency interval as the third frequency point, for example, the distance from the left side of the third frequency point is selected to be the third frequency point of 10 points.
  • the frequency point and the distance from the right side of the third frequency point to the third frequency point are 1 frequency point of 10 points, thereby determining the average value of the amplitudes of the two frequency points to obtain a third average value; for example, selecting the third
  • the distance from the left side of the frequency point is two frequency points of 10 points and 9 points
  • the distance from the right side of the third frequency point to the third frequency point is two points of 10 points and 9 points, thereby determining the frequency point.
  • the average of the amplitudes of the four frequency points gives a third average.
  • the amplitude of the frequency point C is L
  • the second frequency interval is 10 points
  • N is equal to 2 as an example.
  • the frequency interval between the left side of the frequency point C and the frequency point C is 10 points.
  • the frequency points of the 8 points are the frequency point C1 and the frequency point C2
  • the frequency points of the frequency point C on the right side of the frequency point C are 10 points and 8 points respectively
  • the frequency points are the frequency point C4 and the frequency point C3.
  • the amplitude of C1, the amplitude of the frequency point C2, and the amplitude of the frequency point C3, and the average value of the amplitude of the frequency point C4 are L1; thus the amplitude L of the frequency point C minus the average value L1 of the frequency points on both sides thereof And L-L1, after all the frequency points in the preset frequency range are determined by the above method, the frequency point with the highest difference is positioned as the pilot.
  • the frequency point with the highest difference is determined as the frequency point E, and the frequency point E is located in the left half of the preset frequency range, that is, the frequency of the frequency point E is less than the frequency of the intermediate frequency point within the preset frequency range, then
  • the other pilot is the frequency corresponding to the frequency obtained by the frequency point E plus the frequency obtained by the frequency interval between the two pilots in the optical signal transmitted by the predetermined transmitting end.
  • the other pilot is the frequency of the frequency point E minus the pre- The frequency corresponding to the frequency obtained after the frequency interval between the two pilots in the optical signal transmitted by the transmitting end is determined.
  • the receiving end after receiving the optical signal to be processed, the receiving end performs photoelectric conversion on the optical signal to be processed, and then converts into two polarized electrical signals, such as X and Y, respectively. Due to the influence of the state of polarizations (SOP), the amplitude of the pilot is unstable.
  • SOP state of polarizations
  • the CMA algorithm can be used to solve the polarization state to solve the influence of the amplitude instability of the pilot on determining the pilot position.
  • the present application provides a method for overcoming the instability of the pilot amplitude when acquiring the frequency spectrum by the Fourier transform method.
  • the receiving end performs Fourier transform processing on the two polarization electrical signals to obtain a spectrum signal by:
  • P represents a spectral signal
  • X and Y represent two-way polarized electrical signals
  • FFT() represents a Fourier transform function
  • the two polarization electric signals received by the receiving end are different from the transmitting end due to the polarization rotation effect, and the polarization rotation of the ⁇ angle exists, and ⁇ is not fixed. For random quantities.
  • the two polarized electrical signals received at the receiving end can be expressed as follows:
  • Xout (Xin + LS + n) ⁇ cos ⁇ - (Yin + LS + n) ⁇ sin ⁇ ;
  • Xin represents the X-polarized electrical signal in the signal to be transmitted at the transmitting end
  • Yin represents the Y-polarized signal in the signal to be transmitted at the transmitting end
  • Xout represents the X-polarized electrical signal received by the receiving end
  • Yout represents the Y-polarized received by the receiving end.
  • Electrical signal ⁇ represents the polarization rotation angle
  • LS represents the pilot signal
  • n represents the noise.
  • the spectrum signal obtained by the frequency domain square addition method is independent of the angle ⁇ , thereby solving the polarization rotation effect, so that the two polarization electric signals received by the receiving end are not the same as the transmitting end, and A problem that causes polarization rotation of the angle ⁇ .
  • the method may further include:
  • the receiving end determines a frequency offset between the signal received by the receiving end and the filtering channel of the receiving end based on a difference between amplitudes corresponding to two frequency points determined as pilots.
  • the difference between the amplitudes of the two frequency points of the pilot and the frequency offset of the receiving end are inversely related, therefore, based on The inverse relationship, calculating a frequency offset between the signal received by the receiving end and the filtering channel of the receiving end according to the difference between the amplitudes corresponding to the two frequency points determined as the pilot, and then calculating the calculated position
  • the frequency offset between the signal received by the receiving end and the filtering channel of the receiving end is sent to the transmitting end, so that the transmitting end adjusts the center frequency of the transmitting signal according to the received frequency offset.
  • the determined pilot is frequency point X and frequency point Y.
  • the amplitude of the frequency point X is A
  • the amplitude of the frequency point Y is B. Based on the A-B, the frequency offset between the signal received by the receiving end and the filtering channel of the receiving end can be determined.
  • the receiving end may further determine a center frequency of the signal sent by the transmitting end according to the difference between the frequencies of the two frequency points determined as the pilot, and the center frequency of the signal is subtracted from the frequency of the local oscillator signal to obtain the receiving.
  • the local oscillator frequency offset Therefore, the receiving end can perform local oscillator adjustment according to the local frequency offset, or perform local oscillator frequency offset compensation according to the local frequency offset in the subsequent digital signal processing.
  • the center frequency of the signal sent by the transmitting end is C
  • the frequency of the vibration signal is D
  • the local frenquence offset (LOFO) is determined based on the CD.
  • the embodiment of the present application further provides a pilot processing apparatus, where the apparatus is applied to a transmitting end, and the apparatus includes, as shown in FIG. :
  • a Fourier transform unit 901 configured to perform a Fourier transform process on the acquired electrical signal to obtain a spectrum signal
  • the positioning unit 902 is configured to determine a sum of a magnitude corresponding to the first frequency point and a magnitude corresponding to the second frequency point in a preset frequency range in the spectral signal, where the first frequency point sum The second frequency point is the pre- And determining, by the arbitrary frequency in the frequency range, two frequency points of the first frequency interval; wherein the first frequency interval is equal to a frequency interval between two pilots in the optical signal emitted by the predetermined transmitting end; according to the preset The sum of the two frequency points of the first frequency interval at any frequency in the frequency range is located at the pilot position.
  • the preset frequency range is determined in advance based on a maximum frequency offset of the receiving end and a signal bandwidth sent by the transmitting end.
  • the positioning unit 902 is configured to: when the pilot position is located according to a sum of two frequency points of the first frequency interval at any frequency within the preset frequency range, specifically, to: use the preset frequency The two frequency points with the highest value in the range are positioned as pilots.
  • the positioning unit 902 is configured to: when the pilot position is located according to a sum of two frequency points of the first frequency interval that is different in any frequency within the preset frequency range, specifically:
  • Two frequency points with the highest difference among the preset frequency ranges are positioned as pilots.
  • the Fourier transform unit 901 is specifically configured to: when performing a Fourier transform process on the electrical signal to obtain a spectrum signal:
  • the spectrum signal is obtained by performing Fourier transform processing on the two polarization signals included in the electrical signal as follows:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the positioning unit 902 is further configured to: after locating a pilot position according to a sum of two frequency points of the first frequency interval that are different in any frequency within the preset frequency range;
  • the positioning unit 902 is further configured to: after locating a pilot position according to a sum of two frequency points of the first frequency interval that are different in any frequency within the preset frequency range;
  • the local frequency offset is determined based on a difference between a center frequency of the optical signal to be processed and a local oscillator frequency of the receiving end.
  • the embodiment of the present application provides a pilot processing apparatus.
  • the apparatus is applied to a receiving end, and includes:
  • the Fourier transform unit 1001 is configured to perform Fourier transform processing on the acquired electrical signal to obtain a spectrum signal.
  • the locating unit 1002 is configured to determine a third average value of the amplitude corresponding to 2N frequency points in the frequency point of the third frequency point in the preset frequency range not greater than the frequency point of the second frequency interval.
  • the N is a positive integer; each of the 2N frequency points is equal to a frequency interval of the third frequency point.
  • the first average value obtains a difference corresponding to the third frequency point, so that the frequency point with the highest difference among the preset frequency ranges is located as a pilot, wherein the third frequency point is within the preset frequency range. Any frequency point.
  • the position of the other pilot is then determined based on a predetermined frequency interval between the two pilots in the optical signal transmitted by the transmitting end.
  • the Fourier transform unit 1001 performs Fourier transform processing on the electrical signal to obtain a spectrum signal, including: performing two-way polarization signals included in the electrical signal by: Fourier transform processing to obtain the spectrum signal:
  • P represents a spectral signal
  • X and Y represent two polarization signals
  • FFT() represents a Fourier transform function
  • the method of spectral square addition is used to overcome the influence of polarization rotation on the pilot amplitude, thereby improving the accuracy of the positioning pilot.
  • the positioning unit 1002 is further configured to determine, after the two pilots are located, a signal received by the receiving end based on a difference between amplitudes corresponding to two frequency points determined as pilots. Frequency offset between the filter channel and the receiving end. With the above design, the frequency offset between the signal received by the receiving end and the filtering channel of the receiving end can be determined based on the determined pilot.
  • the positioning unit 1002 is further configured to: determine a center frequency of the to-be-processed optical signal based on a frequency of two frequency points determined as pilots; A difference between a center frequency of the optical signal to be processed and a local oscillation frequency of the receiving end determines a local frequency offset.
  • the preset frequency range is determined in advance based on the maximum frequency offset of the receiving end and the signal bandwidth sent by the transmitting end, and the preset frequency range is determined to be more accurate by the above manner, thereby determining the guide.
  • the frequency position is more accurate.
  • each functional unit in each embodiment of the present application may be integrated into one processing. In the device, it may be physically present alone, or two or more units may be integrated in one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the receiving end may include a communication interface 1110, a processor 1120, and a memory 1130.
  • the Fourier transform unit 901, the positioning unit 902, or the Fourier transform unit 1001, and the positioning unit 1002 shown in FIG. 9 or FIG. 10 described above may each be implemented by the processor 1120.
  • the processor 1120 acquires an electrical signal through the communication interface 1110 and is used to implement the method performed by the receiving end described in FIG. 3, FIG. 4 or FIG. In the implementation process, each step of the processing flow may be completed by an integrated logic circuit of hardware in the processor 1120 or an instruction in the form of software.
  • the processor 1120 can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, and a discrete hardware component, which can be implemented or executed in the embodiment of the present application.
  • a general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software units in the processor.
  • Program code for processor 1120 to implement the above methods may be stored in memory 1130.
  • the memory 1130 can be a non-volatile memory, such as a hard disk (English: hard disk drive, abbreviated as HDD) or a solid state drive (English: solid-state drive, abbreviation: SSD), and can also be a volatile memory (English: volatile Memory), such as random access memory (English: random-access memory, abbreviation: RAM).
  • Memory 1130 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • connection medium between the communication interface 1110, the processor 1120, and the memory 1130 is not limited in the embodiment of the present application.
  • the memory 1130, the processor 1120, and the communication interface 1110 are connected by a bus 1140 in FIG. 11.
  • the bus is indicated by a thick line in FIG. 11, and the connection manner between other components is only schematically illustrated. , not limited to.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application 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, CD-ROM, 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

Un procédé, un appareil et un système de traitement de pilote fournissent une manière efficace de déterminer les emplacements des pilotes. Le procédé comprend les étapes suivantes : une extrémité de réception effectue un traitement de transformée de Fourier sur un signal électrique acquis pour obtenir un signal de spectre; l'extrémité de réception déterminant la somme d'une amplitude correspondant à un premier point de fréquence et d'une amplitude correspondant à un second point de fréquence dans une plage de fréquences prédéfinie dans le signal de spectre, le premier point de fréquence et le second point de fréquence étant deux points quelconques de fréquence de la plage de fréquences prédéfinie avec des fréquences différant d'un premier intervalle de fréquence, et le premier intervalle de fréquence étant égal à un intervalle de fréquence prédéterminé entre deux pilotes dans un signal optique transmis par une extrémité de transmission; l'extrémité de réception localisant et déterminant deux points de fréquence ayant la somme la plus élevée dans la plage de fréquences prédéfinie en tant que pilotes. Une localisation précise des pilotes peut ainsi être effectuée.
PCT/CN2017/096652 2017-08-09 2017-08-09 Méthode de traitement de pilote, appareil et système WO2019028702A1 (fr)

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CN201780089071.5A CN110463080B (zh) 2017-08-09 2017-08-09 一种导频处理方法及装置、系统

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