CN115361062B - Spatial information processing system and method based on channel state feedback - Google Patents

Spatial information processing system and method based on channel state feedback Download PDF

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Publication number
CN115361062B
CN115361062B CN202211256427.9A CN202211256427A CN115361062B CN 115361062 B CN115361062 B CN 115361062B CN 202211256427 A CN202211256427 A CN 202211256427A CN 115361062 B CN115361062 B CN 115361062B
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turbulent flow
flow state
information processing
information
laser
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CN115361062A (en
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赵馨
王潼
张雷
宋延嵩
董科研
栾雨生
李洋
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Changchun University of Science and Technology
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Changchun University of Science and Technology
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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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/112—Line-of-sight transmission over an extended range
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • 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
    • H04B10/548—Phase or frequency modulation
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
    • H04B10/5561—Digital phase modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes

Abstract

The invention particularly relates to a spatial information processing system and method based on channel state feedback. The system comprises an information receiving and transmitting module and an information processing module; the information receiving and transmitting module comprises a turbulent flow state receiving device, a modulator, a probability shaping encoder and a laser, wherein the modulator is connected with the probability shaping encoder, and the probability shaping encoder is respectively connected with the laser and the turbulent flow state receiving device; the information processing module comprises a photoelectric detector, a current mirror, a demodulator, an oscilloscope, a flicker index calculation device and a turbulent flow state sending device, wherein the photoelectric detector is connected with the current mirror, the current mirror is respectively connected with the demodulator and the flicker index calculation device, the demodulator is connected with the oscilloscope, and the flicker index calculation device is connected with the turbulent flow state sending device; the information receiving and transmitting module is communicated with the information processing module through an air channel. The invention can improve the communication rate of the laser communication system, improve the performance index of the communication error rate and meet the application requirement of the space laser communication system under the atmosphere channel.

Description

Spatial information processing system and method based on channel state feedback
Technical Field
The invention relates to the technical field of spatial optical communication, in particular to a spatial information processing system and method based on channel state feedback.
Background
Atmospheric turbulence can cause non-uniform distribution of temperature and pressure in the atmosphere, causing the refractive index of light to vary with time and spatial position in the scanned optical field to produce random distribution. The change of the optical refractive index enables the light waves to generate random interference effect in the transmission process, and the random interference enables the intensity of the optical signals to generate rapid random fluctuation at the signal receiving end, namely, the light intensity flickers. The coherent time caused by the light intensity flicker is in the order of milliseconds, and in severe cases, a receiving end cannot receive an optical signal to cause link interruption, so that how to improve the spatial laser communication rate under a turbulent channel is a problem to be solved urgently.
Adaptive optics, multi-aperture transmission, large aperture reception, diversity reception, channel coding, detector adaptive gain adjustment methods can be used to improve laser communication system performance in turbulent channels in general. Probability shaping is a novel coding modulation optimization technology, which not only can reduce the complexity of a system while expanding the transmission capacity of a channel, but also can improve the flexibility of the system without increasing the complexity of the system. At present, the probability shaping technology is widely applied in the technical field of optical fiber communication, the research content of the technology is less under a turbulent flow channel, and particularly, no report is provided for a related method for performing probability shaping adjustment on a modulation signal in real time based on state information of the turbulent flow channel and improving the optical communication rate under the turbulent flow channel.
Disclosure of Invention
The invention aims to provide a spatial information processing system and a spatial information processing method based on channel state feedback. According to the state information of the atmospheric turbulence channel, the probability distribution of the modulation signal constellation is adjusted by the probability shaping technology, so that the communication rate of the laser communication system is improved, the performance indexes such as the communication error rate and the like are improved, and the application requirements of the space laser communication system under the atmospheric channel are met.
The invention provides a spatial information processing system based on channel state feedback, which comprises an information receiving and transmitting module and an information processing module; the information transceiver module comprises a turbulent flow state receiving device 1, a modulator 2, a probability shaping encoder 3 and a laser 4, wherein the modulator 2 is connected with the probability shaping encoder 3, and the probability shaping encoder 3 is respectively connected with the laser 4 and the turbulent flow state receiving module 1; the information processing module comprises a photoelectric detector 5, a current mirror 6, a demodulator 7, an oscilloscope 8, a flicker index calculation device 9 and a turbulent flow state sending device 10, wherein the photoelectric detector 5 is connected with the current mirror 6, the current mirror 6 is respectively connected with the demodulator 7 and the flicker index calculation device 9, the demodulator 7 is connected with the oscilloscope 8, and the flicker index calculation device 9 is connected with the turbulent flow state sending device 10; the information receiving and transmitting module is communicated with the information processing module through an atmosphere channel.
Further, the laser 4 has a wavelength of 1550nm.
Further, the modulator 2 selects a QPSK (quadrature phase shift keying) phase type optical modulator, and the QPSK phase type optical modulator adopts a quaternary phase modulation mode.
Further, the photodetector 5 is an APD (avalanche photo diode) device.
Further, the oscilloscope 8 has a bandwidth of 10Gbps.
The invention also provides a processing method of the spatial information processing system, which comprises the following steps:
step 1, sending information to obtain a modulation signal through a modulator 2, sending the modulation signal to a probability shaping encoder 3, and loading the information output by the probability shaping encoder 3 on a laser 4 to be transmitted into an atmospheric channel;
step 2, the photoelectric detector 5 receives the light intensity signal sent by the laser 4 and converts the light intensity signal into an electric signal, and the electric signal is divided into two paths of signals by the current mirror 6; one path of signal is sent to a flicker index calculating device 9 to obtain turbulent flow state information and is sent to a turbulent flow state sending device 10; the other path of signal passes through a demodulator 7, and then the current communication rate is displayed through an oscilloscope 8;
step 3, the turbulent flow state receiving module 1 receives the turbulent flow state information sent by the turbulent flow state sending device 10, and the probability shaping encoder 3 adjusts the probability distribution of the modulation signal constellation according to the turbulent flow state information;
and 4, displaying the adjusted communication rate by the oscilloscope 8.
The invention has the beneficial effects that: according to the state information of the atmospheric turbulence channel, the probability distribution mode of a modulation signal constellation is adjusted through a probability shaping technology to reduce the influence of turbulence on the performance of the laser communication system, so that the communication rate of the laser communication system is increased, the performance indexes such as the communication error rate are improved, and the application requirements of the space laser communication system under the atmospheric channel are met.
Drawings
Fig. 1 is a schematic diagram of a spatial information processing system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 shows a spatial information processing system based on channel state feedback according to this embodiment, where the system includes an information transceiver module and an information processing module; the information receiving and transmitting module comprises a turbulent flow state receiving device 1, a modulator 2, a probability shaping encoder 3 and a laser 4, wherein the modulator 2 is connected with the probability shaping encoder 3, and the probability shaping encoder 3 is respectively connected with the laser 4 and the turbulent flow state receiving device 1; the information processing module comprises a photoelectric detector 5, a current mirror 6, a demodulator 7, an oscilloscope 8, a flicker index calculation device 9 and a turbulent flow state sending device 10, wherein the photoelectric detector 5 is connected with the current mirror 6, the current mirror 6 is respectively connected with the demodulator 7 and the flicker index calculation device 9, the demodulator 7 is connected with the oscilloscope 8, and the flicker index calculation device 9 is connected with the turbulent flow state sending device 10; the information receiving and transmitting module is communicated with the information processing module through an air channel.
The wavelength of the laser 4 is 1550nm, the modulator 2 is a QPSK phase type optical modulator, the photoelectric detector 5 is an APD device, and the bandwidth of the oscilloscope 8 is 10Gbps.
The processing method of the spatial information processing system comprises the following steps:
step 1, sending information to obtain a modulation signal through a modulator 2, sending the modulation signal to a probability shaping encoder 3, and loading the information output by the probability shaping encoder 3 on a laser 4 to be transmitted into an atmospheric channel.
The sending information refers to user data, and may be binary information to be transmitted by a user, such as an image, audio, video, and the like.
The probability shaping encoder 3 mainly converts the codes with equal probability into the code patterns with unequal probability after encoding, so that the advantage of this is that the discrete information can be centralized, the error rate of communication can be reduced, and the performance of the communication system can be improved during decoding.
The signal after the probability shaping is an electrical signal, and the electrical signal is loaded on the modulation end of the laser 4 and is converted into a digital signal to be output.
Step 2, the photoelectric detector 5 receives the light intensity signal sent by the laser 4 and converts the light intensity signal into an electric signal, and the electric signal is divided into two paths of signals by the current mirror 6; one path of signal is sent to a flicker index calculating device 9 to obtain turbulent flow state information and is sent to a turbulent flow state sending device 10; and the other path of signal passes through a demodulator 7, and then the current communication speed is displayed through an oscilloscope 8.
The step of obtaining the turbulent flow state information comprises: the flicker index calculating device 9 performs mathematical statistics on the electric signal, obtains the turbulence flicker index of the atmospheric channel at the moment according to a flicker index calculation formula, and the size of the index directly reflects the strength of the atmospheric turbulence.
And 3, the turbulent flow state receiving device 1 receives the turbulent flow state information sent by the turbulent flow state sending device 10, and the probability shaping encoder 3 adjusts the probability distribution of the modulation signal constellation according to the turbulent flow state information.
The probability distribution of the signal constellation can be understood as the number of times of occurrence of the signals "00", "01", "10" and "11", and the probability of occurrence of the signals before the unadjusted time is equally divided, so that the probabilities of occurrence of the four codes are the same. After the probability of the modulation signal constellation is adjusted, the probability of the four codes is different, and the phenomenon that the receiving end judges by mistake due to atmosphere turbulence jitter is avoided.
And 4, displaying the adjusted communication rate by the oscilloscope 8.

Claims (5)

1. A processing method of a spatial information processing system based on channel state feedback is characterized in that the system comprises an information receiving and transmitting module and an information processing module; the information receiving and transmitting module comprises a turbulent flow state receiving device (1), a modulator (2), a probability shaping encoder (3) and a laser (4), wherein the modulator (2) is connected with the probability shaping encoder (3), and the probability shaping encoder (3) is respectively connected with the laser (4) and the turbulent flow state receiving device (1); the information processing module comprises a photoelectric detector (5), a current mirror (6), a demodulator (7), an oscilloscope (8), a flicker index calculation device (9) and a turbulent flow state sending device (10), wherein the photoelectric detector (5) is connected with the current mirror (6), the current mirror (6) is respectively connected with the demodulator (7) and the flicker index calculation device (9), the demodulator (7) is connected with the oscilloscope (8), and the flicker index calculation device (9) is connected with the turbulent flow state sending device (10); the information transceiving module is communicated with the information processing module through an atmospheric channel; the method comprises the following steps:
step 1, sending information to obtain a modulation signal through a modulator (2), sending the modulation signal to a probability shaping encoder (3), and loading information output by the probability shaping encoder (3) on a laser (4) to be transmitted into an atmospheric channel;
step 2, a photoelectric detector (5) receives a light intensity signal sent by a laser (4) and converts the light intensity signal into an electric signal, and the electric signal is divided into two paths of signals by a current mirror (6); one path of signal is sent to a flicker index calculating device (9) to obtain turbulent flow state information and is sent to a turbulent flow state sending device (10), and the step of obtaining the turbulent flow state information is as follows: the flicker index calculating device (9) carries out mathematical statistics on the electric signals, obtains the turbulence flicker index of the atmospheric channel at the moment according to a flicker index calculation formula, and the size of the index directly reflects the strength of the atmospheric turbulence; the other path of signal passes through a demodulator (7), and then the current communication rate is displayed through an oscilloscope (8);
step 3, the turbulent flow state receiving device (1) receives turbulent flow state information sent by the turbulent flow state sending device (10), and the probability shaping encoder (3) adjusts probability distribution of modulation signal constellations according to the turbulent flow state information;
and 4, displaying the adjusted communication speed by an oscilloscope (8).
2. Processing method of spatial information processing system according to claim 1, characterized in that the laser (4) wavelength is 1550nm.
3. Processing method of spatial information processing system according to claim 1, characterized in that said modulator (2) is selected from QPSK phase type optical modulators.
4. The spatial information processing system processing method according to claim 1, wherein the photodetector (5) is an APD device.
5. The spatial information processing system processing method as set forth in claim 1, wherein the oscilloscope (8) has a bandwidth of 10Gbps.
CN202211256427.9A 2022-10-14 2022-10-14 Spatial information processing system and method based on channel state feedback Active CN115361062B (en)

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CN114640391A (en) * 2022-04-01 2022-06-17 重庆邮电大学 FSO channel change-oriented mixed constellation shaping method for high-order optical DPSK system

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FR2828359A1 (en) * 2001-07-31 2003-02-07 Koninkl Philips Electronics Nv TRANSMITTER, RECEIVER, METHODS, PROGRAM AND SIGNAL SUITABLE FOR MODULATIONS WITH A LARGE NUMBER OF STATES
CN111756442B (en) * 2020-05-26 2021-06-22 南京大学 Atmospheric turbulence mismatch compensation method in space chaotic laser secure communication system

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Publication number Priority date Publication date Assignee Title
US7603038B1 (en) * 2006-09-05 2009-10-13 Los Alamos National Security, Llc System and method that suppresses intensity fluctuations for free space high-speed optical communication
CN112737686A (en) * 2021-04-01 2021-04-30 南京信息工程大学 High-performance space optical transmission system based on geometric probability shaping technology
CN114640391A (en) * 2022-04-01 2022-06-17 重庆邮电大学 FSO channel change-oriented mixed constellation shaping method for high-order optical DPSK system

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