WO2018068177A1 - Procédé et dispositif d'élimination de bruit par filtrage en peigne et dispositif d'égalisation adaptative dans le domaine fréquentiel - Google Patents

Procédé et dispositif d'élimination de bruit par filtrage en peigne et dispositif d'égalisation adaptative dans le domaine fréquentiel Download PDF

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WO2018068177A1
WO2018068177A1 PCT/CN2016/101651 CN2016101651W WO2018068177A1 WO 2018068177 A1 WO2018068177 A1 WO 2018068177A1 CN 2016101651 W CN2016101651 W CN 2016101651W WO 2018068177 A1 WO2018068177 A1 WO 2018068177A1
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data
unit
frequency domain
time domain
output
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PCT/CN2016/101651
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English (en)
Chinese (zh)
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马文凯
查如冰迈克尔
魏帅
赵曼
陈俊
李良川
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华为技术有限公司
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Priority to PCT/CN2016/101651 priority Critical patent/WO2018068177A1/fr
Priority to CN201680089366.8A priority patent/CN109716664B/zh
Publication of WO2018068177A1 publication Critical patent/WO2018068177A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference

Definitions

  • the present invention relates to the field of data processing technologies, and in particular, to a comb filtering noise canceling method and apparatus, and a frequency domain adaptive equalizing apparatus.
  • filters with long impulse response have been widely used in adaptive digital data processing, such as in the frequency domain adaptive equalization device, Chromatic dispersion (CD) in the transmission link, polarization Both Polarization Mode Dispersion (PMD) and Carrier Recovery (CR) require equalization compensation through filters.
  • An effective method for reducing the complexity of the large tap filter is the frequency domain algorithm, which converts the time domain convolution operation into the frequency domain multiplication operation.
  • FFT Fast Fourier Transformation
  • IFFT Inverse Fast Fourier Transformation
  • the frequency domain comb filter unit generates aliasing noise, resulting in poor comb filtering performance.
  • Embodiments of the present invention provide a comb filtering noise canceling method and apparatus, and a frequency domain adaptive equalizing apparatus, which can eliminate aliasing noise on the basis of implementing comb filtering, and improve performance of frequency domain comb filtering.
  • an embodiment of the present invention provides a method for canceling comb noise, the method comprising: acquiring first frequency domain data, the frequency of the first frequency domain data is N, and the first frequency domain data is passed through an N point IFFT. Converting to the first time domain data, determining a data location of the aliasing noise in the first time domain data according to a data position correspondence relationship between the first time domain data and the preset reference data, and at the data location The data is zeroed to obtain the second time domain data, and the second time domain data is comb-filtered to obtain the second frequency domain data after the aliasing noise is eliminated, and the frequency number of the second frequency domain data is M.
  • the comb filtering of the frequency domain data is realized, and before the comb filtering, the data position of the aliasing noise may be determined by using the preset reference data, and the corresponding data is The data at the location is set to 0 to avoid aliasing noise.
  • the aliasing noise can be eliminated on the basis of the comb filter, and the performance of the frequency domain comb filter is improved.
  • comb filtering the second time domain data to obtain the second frequency domain data after the anti-aliasing noise including: performing the second time domain data
  • the time domain comb filtering obtains the M point time domain data, and converts the M point time domain data into the second frequency data through the M point FFT.
  • the comb filter noise cancellation method provided by the possible implementation method performs time domain comb filtering on the second time domain data and then performs time-frequency conversion of the data, so that when the time domain data is converted into the frequency domain data, Only M point FFT processing is needed for the M point time domain data, which reduces the number of FFT points, further reduces the computational complexity and cost, and improves the performance of the frequency domain comb filtering.
  • the second time domain data is comb filtered to obtain the second frequency domain data after the aliasing noise is removed, including: passing the second time domain data
  • the N-point FFT is converted into N-point frequency domain data, and frequency-domain comb filtering is performed on the N-point frequency domain data to obtain second frequency domain data.
  • the comb filter noise cancellation method provided by the possible implementation manner is characterized in that the complexity of the frequency domain comb filter is lower than that of the time domain comb by first performing time-frequency conversion on the second time domain data and then performing frequency domain comb filtering.
  • the complexity of the filtering thus further reducing the computational complexity and cost, and improving the performance of the frequency domain comb filtering.
  • an embodiment of the present invention provides a comb filter noise canceling apparatus, where the apparatus may include: an acquisition module, a data conversion module, a setting module, and an aliasing noise cancellation module, where the acquiring module is configured to acquire the first frequency domain.
  • the number of frequency points of the first frequency domain data is N
  • the data conversion module is configured to convert the first frequency domain data into the first time domain data through the N point IFFT
  • the setting module is configured to use the first time domain data and the preset reference
  • the data position correspondence between the data, determining the data position of the first time domain data to generate aliasing noise, and zeroing the data at the data position to obtain the second time domain data, and the aliasing noise cancellation module is used for the second Time domain data is comb filtered to obtain anti-aliasing noise
  • the second frequency domain data after the sound, the frequency number of the second frequency domain data is M.
  • the aliasing noise cancellation module is specifically configured to perform time domain comb filtering on the second time domain data to obtain M point time domain data, and when the M point is The domain data is converted to the second frequency data by the M-point FFT.
  • the aliasing noise cancellation module is specifically configured to: convert the second time domain data into N-point frequency domain data by N-point FFT, and perform N-point frequency domain data on the N-point frequency domain data. Frequency domain comb filtering is performed to obtain second frequency domain data.
  • an embodiment of the present invention provides a frequency domain adaptive equalization apparatus, where the apparatus may include: a time domain to frequency domain transform unit, a dispersion compensation unit, a frequency domain adaptive equalization unit, a frequency domain to time domain transform unit, A carrier recovery unit, a hard decision unit, an error calculation unit, a time domain error comb filter unit, a frequency domain adaptive equalization coefficient update unit, an interpolation upsampling unit, and a comb filter noise canceling device.
  • the time domain to frequency domain transform unit is configured to overlap the input time domain data, convert the data overlapped data from the time domain to the frequency domain, and output the data to the dispersion compensation unit.
  • the dispersion compensation unit is configured to perform dispersion compensation on the data outputted by the time domain to the frequency domain transform unit in the frequency domain, and output the dispersion compensated data to the comb filter noise canceling device and the frequency domain adaptive equalization unit respectively.
  • the frequency domain adaptive equalization unit is configured to perform frequency domain equalization on the data output by the dispersion compensation unit according to the tap coefficients output by the difference upsampling unit, and output the frequency domain equalized data to the frequency domain to the time domain transform unit.
  • the frequency domain to time domain transform unit is configured to transform the data outputted by the frequency domain adaptive equalization unit from the frequency domain to the time domain, and perform data de-interlacing, and output the data after the data de-interleaving to the carrier recovery unit.
  • the carrier recovery unit is configured to perform carrier recovery on the data output from the frequency domain to the time domain transform unit, and output the data after the carrier recovery to the error calculation unit and the hard decision unit respectively.
  • the hard decision unit is configured to perform hard decision on the data output by the carrier recovery unit, and output the hard-decised data to the error calculation unit.
  • the error calculation unit is configured to calculate a data error according to the data output by the carrier recovery unit and the data output by the hard decision unit, and output the data error to the time domain error comb filter unit.
  • the time domain error comb filtering unit is configured to perform time domain comb filtering on the data error output by the error calculating unit, and output the time domain comb filtered data to the frequency domain adaptive equalization coefficient updating unit.
  • a frequency domain adaptive equalization coefficient updating unit configured to perform frequency domain adaptive tap coefficient update according to data output by the time domain error comb filtering unit and data output by the comb filtering noise canceling device, and output the tap coefficient update result to the interpolation Upsampling unit.
  • Interpolation upsampling unit for more adaptive frequency domain adaptive equalization coefficients
  • the tap coefficient update result output by the new unit is subjected to interpolation upsampling, and the tap coefficients after the difference upsampling are output to the frequency domain adaptive equalization unit.
  • the comb filter noise canceling device comprises: an acquisition module, a data conversion module, a setting module, an aliasing noise canceling module and a sending module.
  • the obtaining module is configured to obtain data output by the dispersion compensation unit, and the frequency of the data output by the dispersion compensation unit is N, and the data conversion module is configured to convert the data output by the dispersion compensation unit into the first time domain data through the N-point IFFT, and set the module.
  • the second time domain data is obtained by zero, and the aliasing noise cancellation module is configured to comb filter the second time domain data to obtain second frequency domain data after the aliasing noise is eliminated, and the frequency number of the second frequency domain data is M,
  • the sending module is configured to output the second frequency domain data to the frequency domain adaptive equalization coefficient updating unit.
  • the apparatus may further include: a sample intercepting unit and a hard decision intercepting unit.
  • the sample value intercepting unit is configured to intercept a part of the output to the error calculating unit in the data output by the carrier recovery unit.
  • the hard decision intercepting unit is configured to intercept a part of the output to the error calculating unit in the data output by the hard decision unit.
  • the position of the data intercepted by the sample intercepting unit in the data output by the carrier recovery unit is the same as the position of the data intercepted by the hard decision intercepting unit in the data output by the hard decision unit.
  • the frequency domain adaptive equalization apparatus intercepts a part of data in the data output by the carrier recovery unit by the sample intercepting unit, and intercepts a part of the data in the data output by the hard decision unit by the hard decision intercepting unit,
  • the position of the data intercepted by the sample intercepting unit in the data output by the carrier recovery unit is the same as the position of the data intercepted by the hard decision intercepting unit in the data output by the hard decision unit. Therefore, the error calculating unit calculates the data error according to the intercepted data.
  • the data processing delay can be greatly reduced, thereby reducing the tap coefficient update loop delay, and improving the system performance of the frequency domain adaptive filtering device.
  • the aliasing noise cancellation module is specifically configured to perform time domain comb filtering on the second time domain data to obtain M point time domain data, where the M point is The domain data is converted to the second frequency data by the M-point FFT.
  • the aliasing noise cancellation module is specifically configured to: convert the second time domain data into N-point frequency domain data by N-point FFT, and compare the frequency of the N-point frequency domain. According to the frequency domain comb filtering, the second frequency domain data is obtained.
  • N is an integer greater than one.
  • N is an integer multiple of M, and M is an integer greater than 1.
  • the embodiment of the present invention provides a comb filtering noise canceling method and device, and a frequency domain adaptive equalizing apparatus, wherein the comb filtering noise canceling method includes: acquiring first frequency domain data, and the frequency number of the first frequency domain data is N, converting the first frequency domain data into the first time domain data by using the N point IFFT, and determining the aliasing noise in the first time domain data according to the data position correspondence between the first time domain data and the preset reference data Data location, and zeroing the data at the data location to obtain second time domain data, comb filtering the second time domain data, obtaining second frequency domain data after eliminating aliasing noise, and second frequency domain data
  • the frequency point is M.
  • the comb filtering noise canceling method determines the data position of the first frequency domain data that may generate aliasing noise by using the preset reference data, and sets the data at the corresponding data position to 0, and can implement comb filtering. Eliminate aliasing noise and improve the performance of frequency domain comb filtering.
  • FIG. 1 is a schematic structural diagram of a conventional frequency domain adaptive equalization apparatus
  • 2A is a schematic diagram of a data format output by a conventional frequency domain comb filter unit
  • 2B is a schematic diagram of a data format of an output of a conventional time domain error comb filter unit
  • FIG. 3 is a flowchart of a comb filter noise canceling method according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a comb filter noise canceling apparatus according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural diagram of a frequency domain adaptive equalization apparatus according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of a data format output by a sample intercepting unit according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic structural diagram of a frequency domain adaptive equalization apparatus according to Embodiment 2 of the present invention.
  • the comb filter noise cancellation method and device provided by the embodiments of the present invention are mainly applied to a frequency domain adaptive equalization device, and can also be applied to other scenarios that need to eliminate comb filter aliasing noise. No special restrictions are imposed.
  • FIG. 1 is a schematic structural diagram of a conventional frequency domain adaptive equalization apparatus.
  • the existing frequency domain adaptive equalization apparatus includes: a time domain to frequency domain transform unit 11, a dispersion compensation unit 12, a frequency domain adaptive equalization unit 13, a frequency domain to time domain transform unit 14, and carrier recovery.
  • the unit 15 the hard decision unit 16, the error calculation unit 17, the time domain error comb filter unit 18, the frequency domain adaptive equalization coefficient update unit 19, and the frequency domain comb filter unit 20.
  • the time domain to frequency domain transform unit 11 performs data overlap on the received signal x(t) and then transforms it into a frequency domain signal X(f) by FFT, and the dispersion compensation unit 12 performs dispersion compensation, and then
  • the frequency domain adaptive equalization unit 13 performs adaptive equalization in the frequency domain to compensate for impairments such as PMD and SOP of the channel, and then the frequency domain to time domain transform unit 14 outputs the time domain signal Tx by using IFFT and data de-interlacing.
  • the carrier recovery unit 15 performs carrier recovery to compensate for the frequency difference and phase noise between the terminating and transmitting terminals, and outputs a signal Rx(t).
  • the hard decision unit 16 performs a hard decision based on the signal Rx(t) to obtain a signal Dx ( t).
  • the frequency domain comb filtering unit 20 causes the output of the dispersion compensation unit 12
  • the frequency domain sampling resolution of the frequency domain data is reduced by D times
  • the error calculating unit 17 is configured to calculate error data between the data Rx(t) output by the carrier recovery unit 15 and the data Dx(t) output by the hard decision unit 16, which
  • the error data is time domain data
  • the time domain error comb filtering unit 18 reduces the resolution of the time domain data output by the error calculating unit 17 by D times
  • the frequency domain adaptive equalization coefficient updating unit 19 outputs according to the frequency domain comb filtering unit 20.
  • the data output by the data and time domain error comb filtering unit 18 is iteratively updated by the tap coefficients and then sent to the frequency domain adaptive equalization unit 13.
  • the number of points of the FFT/IFFT performed by the frequency domain adaptive equalization coefficient updating unit 19 is reduced by D times, thereby reducing computational complexity and resource power consumption.
  • FIG. 2A is a schematic diagram of a data format outputted by a conventional frequency domain comb filter unit
  • FIG. 2B is a schematic diagram of a data format output by a conventional time domain error comb filter unit, wherein, in order to visually explain how to introduce aliasing Noise, the data output by the dispersion compensation unit in Fig. 2A is time domain data, and the principle of frequency domain comb filtering is described in accordance with the principle of time domain comb filtering. As shown in FIG.
  • the data output from the dispersion compensating unit 12 includes data1 to data4, and the frequency domain comb filtering unit 20 performs sampling processing on all data (data1 to data4) to complete comb filtering.
  • the data output by the error calculating unit 17 includes zero, zero, newdata3, and newdata3, where zero indicates that the data is 0, which is caused by the data de-overlap processing by the frequency domain to time domain transform unit 14.
  • the time domain error comb filtering unit 18 only comb filters newdata3 and newdata3. It can be seen that the data processed by the frequency domain comb filtering unit 20 does not correspond to the data processed by the time domain error comb filtering unit 18, and therefore, the frequency domain comb filtering unit 20 generates aliasing noise.
  • the comb filtering noise canceling method and device and the frequency domain adaptive equalizing device provided by the embodiments of the present invention are used for eliminating aliasing noise generated in the comb filtering process.
  • FIG. 3 is a flowchart of a comb filter noise cancellation method according to Embodiment 1 of the present invention.
  • the comb filter noise cancellation method provided by the embodiment of the present invention may be a comb filter noise cancellation device. As shown in FIG. 3, the comb filter noise cancellation method provided by the embodiment of the present invention may include:
  • Step 101 Acquire first frequency domain data.
  • the frequency of the first frequency domain data is N, and N is an integer greater than 1.
  • Step 102 Convert the first frequency domain data into the first time domain data by N-point IFFT.
  • Step 103 Corresponding to a data location between the first time domain data and the preset reference data And determining a data location in the first time domain data that generates aliasing noise, and zeroing the data at the data location to obtain second time domain data.
  • Step 104 Perform comb filtering on the second time domain data to obtain second frequency domain data after eliminating aliasing noise.
  • the frequency of the second frequency domain data is M, N is an integer multiple of M, and M is an integer greater than 1.
  • the obtained frequency domain of the first frequency domain data is N
  • the first frequency domain data is converted into the first time domain data by the N point IFFT.
  • the preset reference data is time domain data and has a positional correspondence with the first time domain data. It can be understood that if the first time domain data corresponds to the preset reference data, the first time domain data is combed. After filtering, no aliasing noise will be generated. If the first time domain data does not correspond to the preset reference data, aliasing noise will be generated after comb filtering the first time domain data.
  • the data of the first time domain data and the preset reference data corresponds to whether the data of the first time domain data and the preset reference data is 0 or both are non-zero, if all are 0 or are non-zero
  • the first time domain data is considered to correspond to the preset reference data. Therefore, by the data position correspondence between the first time domain data and the preset reference data, it can be determined which data locations in the first time domain data will generate aliasing noise.
  • the second time domain data After determining the data location of the aliasing noise in the first time domain data, setting the data at the data location to 0 to obtain the second time domain data, the second time domain data corresponding to the preset reference data, The second time domain data is comb filtered to avoid aliasing noise. Moreover, the frequency of the second frequency domain data obtained by comb filtering in the second time domain data is reduced to M, so that if FFT or IFFT processing is further performed on the second frequency domain data, the FFT/IFFT can be reduced. The number of points reduces computational complexity and cost.
  • the data position in the first time domain data to generate aliasing noise is usually a continuous data position.
  • the comb filtering noise cancellation method provided by the embodiment of the present invention implements comb filtering on frequency domain data, and before performing comb filtering, first determines data positions that may generate aliasing noise through preset reference data, and The data at the corresponding data location is set to 0 to avoid aliasing noise.
  • the aliasing noise can be eliminated on the basis of the comb filter, and the performance of the frequency domain comb filter is improved.
  • N and M are set according to actual needs, and this embodiment of the present invention No special restrictions are imposed.
  • the setting of the preset reference data is not particularly limited, and is set as needed.
  • step 104 performing comb filtering on the second time domain data to obtain the second frequency domain data after the aliasing noise is removed, which may include:
  • Time domain comb filtering is performed on the second time domain data to obtain M point time domain data.
  • the M-point time domain data is converted to the second frequency data by the M-point FFT.
  • the FFT processing reduces the number of points of the FFT, further reduces the computational complexity and cost, and improves the performance of the frequency domain comb filter.
  • step 104 performing comb filtering on the second time domain data to obtain the second frequency domain data after the aliasing noise is removed, which may include:
  • Frequency domain comb filtering is performed on the N-point frequency domain data to obtain second frequency domain data.
  • An embodiment of the present invention provides a comb filtering noise cancellation method, including: acquiring first frequency domain data, converting first frequency domain data into first time domain data by using N point IFFT, according to first time domain data and pre The data position correspondence relationship between the reference data is determined, the data position of the aliasing noise generated in the first time domain data is determined, and the data is zeroed at the data position to obtain the second time domain data, and the second time domain data is combed. Filtering, obtaining the second frequency domain data after the aliasing noise is eliminated.
  • the comb filter noise elimination method provided by the embodiment of the invention can eliminate the aliasing noise on the basis of the comb filter and improve the performance of the frequency domain comb filter.
  • FIG. 4 is a schematic structural diagram of a comb filter noise canceling apparatus according to Embodiment 1 of the present invention, and a comb filter noise canceling apparatus according to an embodiment of the present invention is configured to perform a comb filter noise canceling method provided by the embodiment shown in FIG. .
  • the comb filter noise canceling apparatus provided by the embodiment of the present invention may include:
  • the obtaining module 31 is configured to acquire first frequency domain data.
  • the frequency of the first frequency domain data is N, and N is an integer greater than 1.
  • the data conversion module 32 is configured to convert the first frequency domain data into the first time domain data by N-point IFFT.
  • the setting module 33 is configured to determine, according to a data location correspondence relationship between the first time domain data and the preset reference data, a data location of the aliasing noise generated in the first time domain data, and set the data to zero at the data location. Second time domain data.
  • the aliasing noise cancellation module 34 is configured to perform comb filtering on the second time domain data to obtain second frequency domain data after the aliasing noise is eliminated.
  • the frequency of the second frequency domain data is M, N is an integer multiple of M, and M is an integer greater than 1.
  • the aliasing noise cancellation module 34 is specifically configured to:
  • Time domain comb filtering is performed on the second time domain data to obtain M point time domain data.
  • the M-point time domain data is converted to the second frequency data by the M-point FFT.
  • the aliasing noise cancellation module 34 is specifically configured to:
  • the second time domain data is converted to N-point frequency domain data by an N-point FFT.
  • Frequency domain comb filtering is performed on the N-point frequency domain data to obtain second frequency domain data.
  • the comb filter noise canceling apparatus provided in the embodiment of the present invention is used to perform the comb filter noise canceling method provided by the method embodiment shown in FIG. 3, and the technical principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 5 is a schematic structural diagram of a frequency domain adaptive equalization apparatus according to Embodiment 1 of the present invention. As shown in FIG. 5, the frequency domain adaptive equalization apparatus provided by the embodiment of the present invention may include:
  • the time domain to frequency domain transform unit 41 is configured to perform data overlap on the input time domain data, transform the data overlapped data from the time domain to the frequency domain, and output the data to the dispersion compensation unit 42.
  • the dispersion compensation unit 42 is configured to perform dispersion compensation on the data output from the time domain to frequency domain transform unit 41 in the frequency domain, and output the dispersion compensated data to the comb filter noise canceling device 52 and Frequency domain adaptive equalization unit 43.
  • the frequency domain adaptive equalization unit 43 is configured to perform frequency domain equalization on the data output by the dispersion compensation unit 42 according to the tap coefficients output by the difference upsampling unit, and output the frequency domain equalized data to the frequency domain to time domain transform unit 44. .
  • the frequency domain to time domain transforming unit 44 is configured to perform data de-overlap after transforming the data output by the frequency domain adaptive equalization unit 43 from the frequency domain to the time domain, and output the data after the data de-overlapped to the carrier recovery unit 45. .
  • the carrier recovery unit 45 is configured to perform carrier recovery on the data output from the frequency domain to time domain transform unit 44, and output the carrier restored data to the error calculation unit 47 and the hard decision unit 46, respectively.
  • the hard decision unit 46 is configured to perform hard decision on the data output by the carrier recovery unit 45, and output the hard-decised data to the error calculation unit 47.
  • the error calculating unit 47 is configured to calculate a data error according to the data output by the carrier recovery unit 45 and the data output by the hard decision unit 46, and output the data error to the time domain error comb filtering unit 48.
  • the time domain error comb filtering unit 48 is configured to perform time domain comb filtering on the data error output by the error calculating unit 47, and output the time domain comb filtered data to the frequency domain adaptive equalization coefficient updating unit 49.
  • the frequency domain adaptive equalization coefficient updating unit 49 is configured to perform frequency domain adaptive tap coefficient update according to the data output by the time domain error comb filtering unit 48 and the data output by the comb filtering noise removing device 51, and update the tap coefficient. Output to the interpolation upsampling unit 50.
  • the interpolation upsampling unit 50 is configured to perform interpolation upsampling on the tap coefficient update result output by the frequency domain adaptive equalization coefficient updating unit 49, and output the difference upsampled tap coefficients to the frequency domain adaptive equalization unit 43.
  • the comb filter noise canceling device 51 may include an acquisition module, a data conversion module, a setting module, an aliasing noise canceling module, and a transmitting module.
  • the acquisition module is configured to acquire data output by the dispersion compensation unit 42.
  • the number of frequency points of the data output by the dispersion compensation unit 42 is N, and N is an integer greater than one.
  • the data conversion module is configured to convert the data output by the dispersion compensation unit 42 into the first time domain data by N-point IFFT.
  • a setting module configured to output according to the first time domain data and the time domain error comb filtering unit 48
  • the data position correspondence between the data determines the data position in the first time domain data where aliasing noise is generated, and zeros the data at the data position to obtain the second time domain data.
  • the aliasing noise cancellation module is configured to comb filter the second time domain data to obtain second frequency domain data after eliminating aliasing noise.
  • the frequency of the second frequency domain data is M, N is an integer multiple of M, and M is an integer greater than 1.
  • a sending module configured to output the second frequency domain data to the frequency domain adaptive equalization coefficient updating unit 49.
  • the combo filter noise canceling apparatus 51 of the embodiment of the present invention is similar to the comb filter noise canceling apparatus provided in the embodiment shown in FIG. 4, and details are not described herein again.
  • each unit module in the frequency domain adaptive equalization device is not particularly limited, as long as the corresponding function is implemented, for example, each unit module can be implemented by a circuit composed of electronic components. It can also be realized by a chip circuit.
  • the aliasing noise cancellation module is specifically used to:
  • Time domain comb filtering is performed on the second time domain data to obtain M point time domain data.
  • the M-point time domain data is converted to the second frequency data by the M-point FFT.
  • the aliasing noise cancellation module is specifically used to:
  • the second time domain data is converted to N-point frequency domain data by an N-point FFT.
  • Frequency domain comb filtering is performed on the N-point frequency domain data to obtain second frequency domain data.
  • the frequency domain adaptive equalization apparatus may further include: a sample intercepting unit 52 and a hard decision intercepting unit 53.
  • the sample value intercepting unit 52 is configured to intercept a part of the data outputted from the carrier recovery unit 45 to the error calculating unit 47.
  • the hard decision intercepting unit 53 is configured to intercept a part of the data outputted from the hard decision unit 46 to the error calculating unit 47.
  • the position of the data intercepted by the sample value extracting unit 52 in the data output by the carrier recovery unit 45 is the same as the position of the data intercepted by the hard decision intercepting unit 53 in the data output by the hard decision unit 46.
  • the error calculation unit 47 needs to calculate a data error according to the data output by the carrier recovery unit 45 and the hard decision unit 46 to implement the dispersion compensation sheet.
  • the data outputted by the element 42 corresponds to each other.
  • a part of data is intercepted by the sample value extracting unit 52 in the data outputted by the carrier recovery unit 45, and a part of the data is intercepted by the hard decision intercepting unit 53 in the data output by the hard decision unit 46, due to the sample value.
  • the position of the data intercepted by the intercepting unit 52 in the data output from the carrier recovery unit 45 is the same as the position of the data intercepted by the hard decision intercepting unit 53 in the data output by the hard decision unit 46, and therefore, the error calculating unit 47 calculates based on the intercepted data.
  • the data error can greatly reduce the data processing delay, thereby reducing the tap coefficient update loop delay and improving the system performance of the frequency domain adaptive filtering device.
  • FIG. 6 is a schematic diagram of a data format output by a sample intercepting unit according to Embodiment 1 of the present invention.
  • the carrier recovery unit a total of five sets of data are processed in parallel, which are respectively s1 to s5, wherein the data output after the carrier corresponding to the s1 segment data includes new1 and new2, and the sample intercepting unit intercepts a part. Data, the final output of the sample interception unit is new1.
  • the embodiment of the invention provides a frequency domain adaptive equalization device, comprising a comb filter noise canceling device, and the comb filter noise canceling device uses the data output by the time domain error comb filter unit as preset reference data, according to the preset reference.
  • the data combs and eliminates the data output by the dispersion compensation unit. Since no aliasing noise is introduced during the comb filtering, the system performance of the frequency domain adaptive equalization device is improved.
  • FIG. 7 is a schematic structural diagram of a frequency domain adaptive equalization apparatus according to Embodiment 2 of the present invention.
  • the embodiment of the present invention provides a specific implementation structure of a frequency domain adaptive equalization apparatus based on the embodiment shown in FIG. 7.
  • the frequency domain adaptive equalization apparatus provided by the embodiment of the present invention may include:
  • Time domain to frequency domain transform unit dispersion compensation unit, frequency domain adaptive equalization unit, frequency domain to time domain transform unit, carrier recovery unit, hard decision unit, sample interception unit, hard interpretation intercept unit, An error calculation unit, a time domain error comb filter unit, a frequency domain adaptive equalization coefficient update unit, an interpolation upsampling unit, and a comb filter noise canceling device.
  • the time domain to frequency domain transform unit receives two polarization symbol sequences path x and path y, and converts path x and path y into frequency domain signals X(f) by data overlap and N point FFT, respectively.
  • Y(f) after which the two dispersion compensation units respectively perform dispersion compensation on X(f) and Y(f), and output the dispersion-compensated signals Rx(f) and Ry(f).
  • the frequency domain adaptive equalization unit compares the tap coefficients Wxx(f), Wyx(f), Wxy(f), and Wyy(f) output by the difference upsampling unit in the frequency domain, to Rx(f) and Ry(f).
  • the frequency domain to time domain transform unit respectively performs N-point IFFT and data de-overlap on Tx(f) and Ty(f), and converts frequency domain signals Tx(f) and Ty(f) into time domain signals Tx, respectively. (t) and Ty(t).
  • the two carrier recovery units perform carrier recovery on Tx(t) and Ty(t) respectively to compensate the frequency difference and phase noise between the receiving end and the transmitting end, respectively outputting the time domain signals Rx(t) and Ry(t), and finally
  • the hard decision unit performs hard decisions based on the signals Rx(t) and Ry(t) to obtain signals Dx(t) and Dy(t), respectively.
  • the sample intercepting unit intercepts a part of Rx(t)
  • the hard interpretation intercepting unit intercepts a part of Dx(t)
  • the error calculating unit calculates a data error according to the output of the sample value intercepting unit and the hard judgment intercepting unit, and the error data is time domain data.
  • the time domain error comb filter unit reduces the resolution of the error data by D times and outputs the signal to the frequency domain adaptive equalization coefficient update unit.
  • the frequency domain adaptive equalization coefficient updating unit outputs the tap coefficient update result by the M point FFT and the M point IFFT operation according to the output data of the time domain error comb filter unit and Hx(f) and Hy(f), and the interpolation upsampling unit will
  • the tap coefficient update result is subjected to interpolation upsampling to obtain the tap coefficients Wxx(f), Wyx(f), Wxy(f), and Wyy(f), and the tap coefficients Wxx(f), Wyx(f), Wxy(f), and Wyy(f) is output to the frequency domain adaptive equalization unit.
  • the comb filter noise canceling device and the time domain error comb filter unit, the number of points of the FFT/IFFT performed in the frequency domain adaptive equalization coefficient updating unit is M points, and the number of points of the FFT/IFFT is lowered. Moreover, the comb filter noise canceling device does not introduce aliasing noise when implementing frequency domain comb filtering, thereby improving the system performance of the frequency domain adaptive equalization device.
  • the aforementioned program can be stored in a computer Read in the storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne, dans ses modes de réalisation, un procédé et un dispositif d'élimination de bruit par filtrage en peigne et un dispositif d'égalisation adaptative dans le domaine fréquentiel. Le procédé d'élimination de bruit par filtrage en peigne comporte les étapes consistant à: acquérir des premières données dans le domaine fréquentiel, le nombre de points de fréquence des premières données dans le domaine fréquentiel étant N; transformer les premières données dans le domaine fréquentiel en premières données dans le domaine temporel au moyen d'une IFFT sur N points; déterminer une position de données de bruit de repliement générées dans les premières données dans le domaine temporel selon une relation de correspondance de positions de données entre les premières données dans le domaine temporel et des données de référence préétablies, et acquérir des deuxièmes données dans le domaine temporel en réinitialisant des données dans la position de données; et effectuer un filtrage en peigne sur les deuxièmes données dans le domaine temporel pour obtenir des deuxièmes données dans le domaine fréquentiel après que le bruit de repliement a été éliminé, le nombre de points de fréquence des deuxièmes données dans le domaine fréquentiel étant M. Le procédé d'élimination de bruit par filtrage en peigne selon les modes de réalisation de l'invention peut éliminer un bruit de repliement au moyen d'un filtrage en peigne et améliorer les performances du filtrage en peigne dans le domaine fréquentiel.
PCT/CN2016/101651 2016-10-10 2016-10-10 Procédé et dispositif d'élimination de bruit par filtrage en peigne et dispositif d'égalisation adaptative dans le domaine fréquentiel WO2018068177A1 (fr)

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PCT/CN2016/101651 WO2018068177A1 (fr) 2016-10-10 2016-10-10 Procédé et dispositif d'élimination de bruit par filtrage en peigne et dispositif d'égalisation adaptative dans le domaine fréquentiel
CN201680089366.8A CN109716664B (zh) 2016-10-10 2016-10-10 梳状滤波噪声消除方法、装置及频域自适应均衡装置

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