WO2023246089A1 - Système et procédé de fronthaul mobile, et support de stockage - Google Patents

Système et procédé de fronthaul mobile, et support de stockage Download PDF

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Publication number
WO2023246089A1
WO2023246089A1 PCT/CN2023/072280 CN2023072280W WO2023246089A1 WO 2023246089 A1 WO2023246089 A1 WO 2023246089A1 CN 2023072280 W CN2023072280 W CN 2023072280W WO 2023246089 A1 WO2023246089 A1 WO 2023246089A1
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signal
digital signal
optical
self
digital
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PCT/CN2023/072280
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English (en)
Chinese (zh)
Inventor
吕凯林
朱晓光
陈文娟
范忱
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中兴通讯股份有限公司
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Publication of WO2023246089A1 publication Critical patent/WO2023246089A1/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
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • 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
    • H04B10/40—Transceivers
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • 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
    • H04B10/61—Coherent receivers
    • 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
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6164—Estimation or correction of the frequency offset between the received optical signal and the optical local oscillator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to the field of mobile communication technology, and in particular, to a mobile fronthaul system, method and storage medium.
  • Embodiments of the present disclosure provide a mobile fronthaul system, method and storage medium.
  • a mobile fronthaul system including: a transmitting end and a receiving end, the transmitting end and the receiving end are connected through a single-mode optical fiber, wherein the transmitting end transmits a first analog
  • the signal is converted into a first digital signal, and the first digital signal is loaded onto an optical carrier to obtain a modulated first optical signal
  • the receiving end performs self-coherent detection on the first optical signal, and detects a second digital signal, amplify the second digital signal, filter out the out-of-band quantization noise of the amplified second digital signal, and obtain a second analog signal
  • the single-mode optical fiber transmits the first optical signal to the receiving end.
  • a mobile fronthaul method including: converting a first analog signal into a first digital signal, wherein the first analog signal is an up-converted orthogonal frequency signal.
  • OFDM analog signals are multiplexed, and the first digital signal is a DSM signal; the first digital signal is loaded onto the optical carrier generated by the laser diode to obtain a modulated first optical signal; the self-coherent receiver module The first optical signal is self-coherently detected to detect a second digital signal; after the second digital signal is amplified by a digital power amplifier, the out-of-band quantization noise of the amplified second digital signal is filtered out to obtain Second analog signal.
  • a storage medium is also provided.
  • a computer program is stored on the storage medium.
  • the computer program is executed by a processor, the mobile fronthaul method as described above is implemented.
  • a computer program product containing instructions, which when run on a computer, causes the computer to perform the above method.
  • Figure 1 is a schematic structural diagram of a mobile fronthaul system in an embodiment of the present disclosure
  • Figure 2 is a schematic structural diagram of the transmitting end of the mobile fronthaul system in an embodiment of the present disclosure
  • Figure 3 is a schematic structural diagram of the receiving end of the mobile fronthaul system in an embodiment of the present disclosure
  • Figure 4 is a schematic structural diagram of a self-coherent receiver module in an embodiment of the present disclosure
  • Figure 5 is a schematic diagram of the structure and signal transmission of a mobile fronthaul system in an embodiment of the present disclosure
  • Figure 6 is a schematic flowchart of a mobile fronthaul method according to an embodiment of the present disclosure
  • Figure 7 is a schematic diagram of the self-coherence detection spectrum in an embodiment of the present disclosure.
  • Figure 8 is a schematic diagram of the correction of the Delta Sigma modulated signal in the embodiment of the present disclosure.
  • Analog mobile fronthaul based on optical radio frequency technology has the advantages of large transmission capacity and high spectrum efficiency. However, due to the continuous waveform and peak-to-average power ratio of analog signals, they are easily affected by nonlinear distortion introduced by optical devices, electrical devices, and optical fiber links, resulting in limitations in their receiving sensitivity, transmission performance, and transmission distance. Digital mobile fronthaul usually uses CPRI (Common Public Radio Interface, Common Public Radio Interface) to sample and quantize the continuous waveform of analog signals, which can provide excellent transmission impairment tolerance, but the spectrum efficiency is relatively low and requires a large data bandwidth .
  • CPRI Common Public Radio Interface
  • IMDD Intensity-modulation with Direct-detection, intensity modulation direct detection
  • IMDD Intensity-modulation with Direct-detection, intensity modulation direct detection
  • phase noise and frequency offset require complex digital signal processing to compensate and estimate.
  • components such as local lasers and balanced light detectors will significantly increase system cost and complexity.
  • FIG. 1 is a schematic structural diagram of a mobile fronthaul system in an embodiment of the present disclosure.
  • the mobile fronthaul system includes: a transmitting end 10 and a receiving end 20.
  • the transmitting end 10 and the receiving end 20 connected via single mode fiber 30.
  • the transmitting end 10 converts the first analog signal into a first digital signal; loads the first digital signal onto the optical carrier to obtain a modulated first optical signal.
  • the receiving end 20 performs self-coherent detection on the first optical signal to detect the second digital signal; amplifies the second digital signal and filters out the out-of-band quantization noise of the amplified second digital signal to obtain the second analog signal.
  • the single-mode optical fiber 30 transmits the first optical signal to the receiving end.
  • the original signal is an analog signal.
  • the transmitting end converts the analog signal into a digital signal and loads it onto the optical carrier to obtain a modulated optical signal.
  • the modulated optical signal is transmitted to the receiving end through a standard single-mode optical fiber.
  • the receiving end performs self-coherence detection on the optical signal, detects the digital signal carried in the optical signal, and then amplifies the digital signal, filters out the out-of-band quantization noise of the amplified digital signal, and converts the digital signal into an analog signal.
  • Analog signals are transmitted through the antenna to achieve mobile fronthaul.
  • Analog signals are easily affected by nonlinear distortion.
  • the original analog signal is converted into a digital signal for signal transmission, which can improve the system's ability to resist nonlinear noise.
  • the detection Digital signal By performing self-coherent detection on the modulated optical signal, the detection Digital signal; amplify the digital signal, filter out the out-of-band quantization noise of the amplified digital signal, and restore the analog signal, realizing the conversion of digital-to-analog signals without the need for a digital-to-analog converter, reducing the cost of the mobile fronthaul system the complexity.
  • FIG 2 is a schematic structural diagram of the transmitter end of the mobile fronthaul system in an embodiment of the present disclosure.
  • the transmitter end 10 includes an analog signal generation module 11, a Delta Sigma modulator module 12, and an electro-optical conversion module 13.
  • the analog signal generation module 11 generates a first analog signal, where the first analog signal is an up-converted orthogonal frequency division multiplexing OFDM analog signal.
  • the analog signal is generated by the analog signal generation module, and the generated analog signal is an orthogonal frequency division multiplexing OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) analog signal after upconversion.
  • OFDM Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing
  • Delta Sigma Modulator (DSM) module 12 converts the first analog signal into a first digital signal.
  • Delta Sigma modulation is a digital method based on oversampling and noise shaping. It samples the signal at a frequency much greater than twice the signal bandwidth, and moves most of the quantization noise frequency components to high frequencies through a loop filter.
  • PCM Pulse Code Modulation
  • ADC Analog-to-digital converter, analog-to-digital converter
  • ADC Analog-to-digital converter, analog-to-digital converter
  • the original analog signal is converted into a digital signal after passing through the bandpass Delta Sigma modulator module, and the resulting digital signal is the Delta Sigma modulated signal.
  • the digital signal is usually a two-level or four-level signal.
  • the electro-optical conversion module 13 loads the first digital signal onto the optical carrier to obtain a modulated first optical signal.
  • a digital signal is loaded onto an optical carrier through an electro-optical conversion module to obtain a modulated optical signal.
  • the electro-optical conversion module is a MZM (Mach-Zehnder Modulator), and the optical carrier Generated by LD (Laser Diode, laser diode), the Delta Sigma modulated signal is loaded onto the optical carrier generated by LD (Laser Diode, laser diode) through MZM (Mach-Zehnder Modulator, Mach-Zehnder modulator), and then passed through SSMF (Standard Single Mode Fiber, standard single-mode fiber) transmits the optical signal carrying the Delta Sigma modulated signal to the receiving end of the mobile fronthaul system.
  • MZM Machine-Zehnder Modulator
  • SSMF Standard Single Mode Fiber, standard single-mode fiber
  • the transmitting end of the embodiment of the present disclosure includes an analog signal generation module, a Delta Sigma modulator module, and an electro-optical conversion module, which converts the original analog signal into a digital signal, and then loads the digital signal onto the optical carrier to obtain a modulated optical signal.
  • an analog signal generation module a Delta Sigma modulator module
  • an electro-optical conversion module which converts the original analog signal into a digital signal, and then loads the digital signal onto the optical carrier to obtain a modulated optical signal.
  • FIG. 3 is a schematic structural diagram of the receiving end of the mobile fronthaul system in an embodiment of the disclosure.
  • the receiving end 20 includes a self-coherent receiver module 21 , a digital power amplifier module 22 , and a bandpass filter module 23 .
  • the self-coherent receiver module 21 performs self-coherent detection on the first optical signal, and detects the second digital signal.
  • the optical signal modulated by the transmitting end is transmitted to the receiving end through a standard single-mode optical fiber.
  • the self-coherent receiver module in the receiving end converts the optical signal into an electrical signal, and detects the Delta Sigma modulated signal carried in the optical signal. .
  • the digital power amplifier module 22 amplifies the second digital signal.
  • the digital signal detected by the self-coherent receiver module is amplified by a DPA (Digital Power Amplifier), and its efficiency is much higher than that of an analog power amplifier.
  • DPA Digital Power Amplifier
  • the bandpass filter module 23 filters out-of-band quantization noise of the amplified second digital signal to obtain a second analog signal.
  • the embodiment of the present disclosure uses a BPF (Band-pass Filter) to filter out the out-of-band quantization noise of the Delta Sigma modulated signal, thereby recovering the digital signal to obtain an OFDM analog signal.
  • BPF Band-pass Filter
  • the receiving end includes a self-coherent receiver module, a digital power amplifier module, and a bandpass filter module.
  • the receiving end uses the self-coherent receiver module to perform self-coherent detection of optical signals, detect digital signals, and uses a digital power amplifier. Amplify the digital signal, use a bandpass filter to convert the digital signal into the original analog signal, and finally transmit the analog signal through the antenna.
  • the embodiment of the present disclosure does not require the use of complex digital signal processing. Compensation and estimation of phase noise and frequency offset reduce system complexity.
  • FIG 4 is a schematic structural diagram of a self-coherent receiver module in an embodiment of the present disclosure.
  • the self-coherent receiver module consists of a DFB (Distributed Feedback, distributed feedback) laser and an EAM (Electro-absorption Modulator, electro-absorption modulator) Composed, the distributed feedback laser provides the local oscillator light required in the self-coherent receiver module.
  • DFB Distributed Feedback, distributed feedback
  • EAM Electro-absorption Modulator, electro-absorption modulator
  • the local oscillator light and The first optical signal injected into the electroabsorption modulator is locked and synchronized; the electroabsorption modulator detects the second optical signal coupled with the local oscillator light provided by the distributed feedback laser to obtain a second digital signal.
  • the self-coherent receiver module in the disclosed embodiment is EML (Electro-absorption Modulated Laser, electro-absorption modulated laser).
  • EML is an integrated device of EAM and DFB laser. It is a high-speed optical fiber transmission network with small size and low wavelength chirp integrated by an electroabsorption modulator that utilizes the quantum confinement Stark effect (QCSE) and a DFB laser that uses internal grating coupling to determine the wavelength.
  • QCSE quantum confinement Stark effect
  • DFB serves as the local oscillator and EAM serves as the detector. Part of the signal light injected into the EML is injected into the EAM detector and part into the DFB laser.
  • the EAM has a similar structure to the photodiode and can be used as a detector when working in the absorption state.
  • DFB The laser acts as an injection-locked slave laser, providing the local oscillator light required in an autocoherent receiver.
  • the carrier wavelength of the injected signal light is similar to the wavelength of the laser generated by the DFB, and the wavelength difference between the first wavelength of the first optical signal and the second wavelength of the local oscillator light is less than the preset threshold, using injection locking technology, the wavelength of the laser generated by the DFB laser Can be migrated to the signal light, which is the same wavelength as the signal light, and the output power remains unchanged.
  • injection-locked lasers can effectively suppress amplitude noise and phase noise without requiring frequency offset estimation, thus simplifying the processing of received signals.
  • the line width of the output light of the slave laser is only determined by the master light and has nothing to do with the original line width of the slave laser, thereby reducing the line width of the DFB laser and improving the stability of the DFB laser.
  • a polarization controller and an optical circulator are further provided between the transmitting end and the receiving end, wherein the polarization controller adjusts the polarization state of the first optical signal to be consistent with the polarization state of the local light in the self-coherent receiver module. Consistent; the optical circulator blocks the output light of the self-coherent receiver module from flowing back to the transmitter.
  • the polarization state of the signal light can be adjusted by manually adjusting a PC (Polarization controller) so that it is consistent with the polarization state of the local oscillator light in coherent detection.
  • PC Polarization controller
  • optical circulators use multi-port non-reciprocal optical devices to complete the separation task of forward and reverse transmission signal light.
  • the signal light whose polarization state is adjusted by the polarization controller is injected into the EML self-coherent receiver through an OC (Optical Circulator) to prevent the EML output light from flowing back to the transmitter.
  • the polarization state of the first optical signal is adjusted and the output light of the self-coherent receiver module is blocked from flowing back to the transmitter.
  • FIG. 5 is a schematic diagram of the structure and signal transmission of a mobile fronthaul system in an embodiment of the present disclosure. Refer to FIG. 5 for a complete explanation of the mobile fronthaul system in an embodiment of the present disclosure.
  • the mobile fronthaul system in the embodiment of the present disclosure consists of an analog signal generation module, a Delta Sigma modulator module, an electro-optical conversion module, a single-mode optical fiber, an autocoherent receiver module, a digital power amplifier module, and a band-pass filtering module. It consists of a polarization controller module, a polarization controller, and an optical circulator.
  • the original signal is usually an up-converted OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) analog signal.
  • the analog signal is converted into a digital signal, that is, a Delta Sigma modulated signal, after passing through a bandpass Delta Sigma modulator, as shown in the figure
  • the Delta Sigma modulated signal is modulated onto the optical carrier generated by LD (Laser Diode) through MZM (Mach-Zehnder Modulator), and the signal light is transmitted through SSMF (Standard Single Mode) Fiber, standard single-mode optical fiber), the polarization state of the signal light is adjusted by manually adjusting the PC (Polarization controller, polarization controller), so that it is consistent with the polarization state of the local oscillation light in coherent detection, and passes through the OC (Optical Circulator, optical circulator) is injected into the EML self-coherent receiver, where OC is used to prevent the EML output light from flowing back to the transmitter.
  • OFDM
  • the Delta Sigma modulated signal detected by EML is amplified by a DPA (Digital Power Amplifier, digital power amplifier), and a BPF (Band-pass Filter, band-pass filter) is used to filter out the out-of-band quantization noise of the Delta Sigma modulated signal, thereby restoring The OFDM analog signal is obtained, and finally the OFDM analog signal is transmitted through the antenna to achieve mobile fronthaul.
  • DPA Digital Power Amplifier, digital power amplifier
  • BPF Band-pass Filter, band-pass filter
  • a mobile fronthaul system proposed in an embodiment of the present disclosure includes: a transmitting end and a receiving end, and the transmitting end and the receiving end are connected through a single-mode optical fiber.
  • the transmitting end converts the first analog signal into a first digital signal; loads the first digital signal onto the optical carrier to obtain a modulated first optical signal.
  • the receiving end performs self-coherence detection on the first optical signal to detect the second digital signal; amplifies the second digital signal and filters out the out-of-band quantization noise of the amplified second digital signal to obtain the second analog signal.
  • the single-mode optical fiber transmits the first optical signal to the receiving end.
  • the original analog signal is converted into a digital signal for signal transmission, which can improve the system's ability to resist nonlinear noise and perform self-coherent detection on the modulated optical signal. , detect the digital signal; amplify the digital signal, filter out the out-of-band quantization noise of the amplified digital signal, and restore the analog signal, realizing the conversion of digital-to-analog signals without the need for a digital-to-analog converter, reducing the cost Mobile fronthaul system complexity.
  • FIG. 6 is a schematic flowchart of a mobile fronthaul method according to an embodiment of the present disclosure. The method includes steps S10 to S40.
  • the original signal is an up-converted OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) analog signal.
  • the analog signal is converted into a digital signal after passing through a bandpass Delta Sigma modulator.
  • the first digital signal that is, the Delta Sigma modulated signal
  • the optical carrier generated by the LD Laser Diode, laser diode
  • MZM Machine-Zehnder Modulator
  • the optical signal is transmitted in SSMF (Standard Single Mode Fiber, standard single-mode fiber) and injected into the EML self-coherent receiver.
  • the self-coherent receiver performs self-coherent detection on the optical signal and detects the Delta Sigma modulation in the optical signal. Signal.
  • the Delta Sigma modulated signal detected by EML is amplified by a DPA (Digital Power Amplifier), which is much more efficient than an analog power amplifier, and then a BPF (Band-pass Filter) is used to filter out the Delta Sigma modulated signal.
  • DPA Digital Power Amplifier
  • BPF Band-pass Filter
  • the original analog signal is converted into a Delta Sigma digital signal, which can improve the system's ability to resist nonlinear noise and improve spectrum utilization.
  • the self-coherent receiver module is used to perform self-coherent detection on the digital signal at the receiving end, which can improve the system's ability to resist nonlinear noise. Receiving sensitivity, reducing system complexity and power consumption.
  • the first optical signal is self-coherently detected through an autocoherent receiver, and the second digital signal is detected, that is, S30, which includes steps S31 to S32.
  • the way to adjust the polarization state of the first optical signal may be to adjust the polarization state of the signal light by adjusting the PC (Polarization controller, polarization controller) so that it maintains the polarization state of the local light in coherent detection. consistent.
  • the EML autocoherent receiver is composed of a DFB (Distributed Feedback) laser and an EAM (Electro-absorption Modulator).
  • DFB Distributed Feedback
  • EAM Electro-absorption Modulator
  • Part of the signal light injected into the EML is injected into the EAM detector and part into the DFB laser.
  • the EAM has a similar structure to the photodiode and can be used as a detector when working in the absorption state.
  • DFB The laser acts as an injection-locked slave laser to provide the local oscillator light required in the autocoherent receiver. When the injected signal light carrier wavelength is consistent with the DFB The wavelength of the laser generated is similar.
  • the wavelength difference between the first wavelength of the first optical signal and the second wavelength of the local oscillator light is less than the preset threshold
  • injection locking technology the wavelength of the laser generated by the DFB laser can be migrated to the same wavelength as the signal light. , and the output power remains unchanged.
  • injection-locked lasers can effectively suppress amplitude noise and phase noise without requiring frequency offset estimation, thus simplifying the processing of received signals.
  • the line width of the output light of the slave laser is only determined by the master light and has nothing to do with the original line width of the slave laser, thereby reducing the line width of the DFB laser and improving the stability of the DFB laser.
  • Figure 7 is a schematic diagram of the self-coherent detection spectrum in an embodiment of the present disclosure, where Figure 7(1) is the first optical signal spectrum, Figure 7(2) is the DFB laser emission spectrum, and Figure 7(3) is the EAM reception signal spectrum.
  • the first optical signal spectrum of the Delta Sigma modulated signal modulated onto the optical carrier through MZM is shown in Figure 7(1).
  • the optical carrier is generated by LD, its wavelength is ⁇ LD and the line width is narrow.
  • the laser spectrum generated by DFB is shown in Figure 4(2), and its wavelength is ⁇ DFB . A part of the first optical signal is injected into the DFB.
  • the laser wavelength generated by the DFB laser is locked and synchronized to the wavelength of the injected light wave ⁇ LD , and the line width is only determined by the injected light wave.
  • the light wave determines, thus providing the local oscillator light required in an autocoherent receiver.
  • the local oscillator light provided by the DFB laser is coupled with the first optical signal injected into the EAM and detected by the EAM.
  • the spectrum of the EAM received signal is shown in Figure 4(3).
  • the carrier power of this signal is higher than the carrier power of the injected first optical signal, and the carrier power of this signal will not decrease as the received optical power decreases, so It can improve the receiving sensitivity of the system.
  • the embodiment of the present disclosure uses an EML autocoherent receiver to detect the Delta Sigma modulated signal carried by the first optical signal to achieve photoelectric conversion of the signal.
  • Figure 8 is a schematic diagram of the correction of the Delta Sigma modulated signal in an embodiment of the present disclosure.
  • the method before performing autocoherent detection on the first optical signal through an autocoherent receiver and detecting the second digital signal, the method further includes: extracting the analog-to-digital signal conversion according to the first digital signal and the first analog signal. the quantization noise at the time; multiply the quantization noise by the preset factor to obtain the attenuated quantization noise; and subtract the attenuated quantization noise from the first digital signal to obtain the modified first digital signal.
  • the embodiment of the present disclosure corrects the Delta Sigma modulated signal through quantization and noise reduction.
  • the input is first subtracted from the analog-to-digital converted Delta Sigma modulated signal, that is, the original analog signal is subtracted to extract the quantization noise, and then the quantization noise is multiplied by the factor ⁇ (0 ⁇ 1 ) is attenuated, and finally, the attenuated quantization noise is subtracted from the Delta Sigma modulated signal again to obtain the corrected "Delta Sigma modulated signal".
  • Multi-bit quantization is a common method to reduce quantization noise, but it will cause the data rate to be too high.
  • the embodiment of the present disclosure removes a part of the quantization noise from the Delta Sigma modulated signal and controls the noise reduction level through the quantization noise reduction factor ⁇ , which can Reduce the quantization noise around the optical carrier of the Delta Sigma modulated signal and ensure that the increase in the remaining carrier component does allow a larger locking range to achieve the injection locking technology of the Delta Sigma modulated signal.
  • the method before performing self-coherent detection on the first optical signal through an autocoherent receiver and detecting the second digital signal, the method further includes: using a first-order high-pass Butterworth digital with a cutoff frequency F 0 of ⁇ The filter filters out low-frequency noise near the optical carrier of the first digital signal to obtain a larger residual carrier component, and obtains the modified first digital signal.
  • the embodiment of the present disclosure corrects the Delta Sigma modulated signal through high-pass filtering.
  • a first-order high-pass Butterworth digital filter with a cutoff frequency F 0 of ⁇ (0 ⁇ 1) is used to filter out the low-frequency noise near the Delta Sigma modulated signal optical carrier through high-pass filtering to obtain a better Large residual carrier component, thereby greatly increasing the locking range to achieve injection locking technology for Delta Sigma modulated signals.
  • the Delta Sigma modulated signal is corrected through the above two methods to better realize the injection locking of the Delta Sigma modulated signal.
  • the method according to the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is Better implementation.
  • the technical solution of the present disclosure can be embodied in the form of a software product in essence or that contributes to related technologies.
  • the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk). ), includes several instructions to cause a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of various embodiments of the present disclosure.
  • An embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored.
  • the computer-readable storage medium can be at least one of ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk.
  • the computer-readable storage medium includes a number of instructions. It is used to cause a terminal device with a control module (which can be a television, a car, a mobile phone, a computer, a server, a terminal, or a network device, etc.) to execute the methods described in the above embodiments of the present disclosure.
  • a control module which can be a television, a car, a mobile phone, a computer, a server, a terminal, or a network device, etc.
  • a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute the methods described in the above embodiments of the present disclosure.
  • the disclosed technical content can be implemented in other ways.
  • the device embodiments described above are only illustrative, such as the division of units, which is only a Logical function division can be divided in other ways in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the units or modules may be in electrical or other forms.
  • a unit described as a separate component may or may not be physically separate.
  • a component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • Integrated units may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as independent products.
  • the technical solution of the present disclosure is essentially or contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, It includes several instructions to cause a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present disclosure.
  • the aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code. .

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  • Optical Communication System (AREA)

Abstract

La présente invention se rapporte au domaine technique des communications mobiles. Sont divulgués un système et un procédé de fronthaul mobile, et un support de stockage. Le système comprend une extrémité de transmission et une extrémité de réception ; l'extrémité de transmission est connectée à l'extrémité de réception au moyen d'une fibre optique monomode ; l'extrémité de transmission convertit un premier signal analogique en un premier signal numérique, et charge le premier signal numérique sur une porteuse optique pour obtenir un premier signal optique modulé ; l'extrémité de réception effectue une détection auto-cohérente sur le premier signal optique, détecte celui-ci pour obtenir un second signal numérique, amplifie le second signal numérique, et filtre le bruit de quantification hors bande du second signal numérique amplifié pour obtenir un second signal analogique ; la fibre optique monomode transmet le premier signal optique à l'extrémité de réception.
PCT/CN2023/072280 2022-06-20 2023-01-16 Système et procédé de fronthaul mobile, et support de stockage WO2023246089A1 (fr)

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CN202210698800.XA CN117318814A (zh) 2022-06-20 2022-06-20 移动前传系统、方法及存储介质

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190280774A1 (en) * 2016-08-29 2019-09-12 Technion Research And Development Foundation Ltd. Transparent linear optical transmission of passband and baseband electrical signals
WO2021218181A1 (fr) * 2020-04-29 2021-11-04 华为技术有限公司 Onu, olt, système de communication optique et procédé de transmission de données
CN113904687A (zh) * 2021-09-06 2022-01-07 华中科技大学 一种基于delta-sigma调制的模拟信号量化方法及装置
CN113938200A (zh) * 2021-09-07 2022-01-14 华中科技大学 一种基于Delta-Sigma调制的数字移动前传方法及装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190280774A1 (en) * 2016-08-29 2019-09-12 Technion Research And Development Foundation Ltd. Transparent linear optical transmission of passband and baseband electrical signals
WO2021218181A1 (fr) * 2020-04-29 2021-11-04 华为技术有限公司 Onu, olt, système de communication optique et procédé de transmission de données
CN113904687A (zh) * 2021-09-06 2022-01-07 华中科技大学 一种基于delta-sigma调制的模拟信号量化方法及装置
CN113938200A (zh) * 2021-09-07 2022-01-14 华中科技大学 一种基于Delta-Sigma调制的数字移动前传方法及装置

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