CN115412174A - Throughput improving method of laser communication system - Google Patents

Throughput improving method of laser communication system Download PDF

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Publication number
CN115412174A
CN115412174A CN202211033550.4A CN202211033550A CN115412174A CN 115412174 A CN115412174 A CN 115412174A CN 202211033550 A CN202211033550 A CN 202211033550A CN 115412174 A CN115412174 A CN 115412174A
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noiseless
code word
communication system
throughput
laser communication
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李亚添
耿天文
高世杰
马爽
李学良
李林
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation

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  • Electromagnetism (AREA)
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  • Computer Networks & Wireless Communication (AREA)
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  • Optics & Photonics (AREA)
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Abstract

The invention provides a throughput capacity improving method of a laser communication system, which comprises the steps that firstly, information to be transmitted is coded by adopting a unique decodable code word set at a transmitting end and then transmitted; the second step of transmitting symbols, after passing through the channel, completes non-orthogonal superposition in the power domain to obtain superposed signals; and thirdly, demodulating the superposed signals at a receiving end in a mode of mapping the superposed signals into code words through a noise-free superposed pattern set to obtain complete and accurate transmission information. The invention effectively improves the throughput of the multi-antenna laser communication system by utilizing the non-orthogonal characteristic of the unique decodable code word, namely the number of correctly transmitted bits in unit time, and provides a new thought for demodulating and transmitting information by mapping the noiseless superposition pattern set into the code word. Meanwhile, the invention can also be combined with other multiplexing technologies, such as multilevel modulation, angular momentum multiplexing and wavelength division multiplexing, thereby further improving the throughput of the system.

Description

Throughput improving method of laser communication system
Technical Field
The invention relates to the technical field of laser communication, and particularly provides a throughput capacity improving method of a laser communication system.
Background
The free space optical communication has the advantages of large capacity, strong anti-electromagnetic interference capability, no need of frequency authorization and the like. The intensity modulation direct detection system is easy to be applied to various scenes due to the advantages of simple structure, low cost, convenience in coupling and the like. In order to overcome the severe channel conditions, researchers have proposed diversity techniques to overcome channel fading, a common diversity technique being spatial diversity. Spatial diversity, while robust against channel fading, does not improve system throughput. Therefore, the present patent is directed to improving the throughput of a multiple-transmit-single-receive laser communication system of an intensity modulated direct detection system.
Unlike radio frequency communication, the non-negativity of light intensity in laser communication makes the mature space-time coding in radio frequency communication not directly applicable to laser communication systems. In addition, the space-time coding method itself does not improve the information rate. Especially for high dimensional space-time coding, the amount of information per unit time is also reduced. In the prior research, codes applied in a multi-antenna laser communication system are all orthogonal codes. This makes it impossible to obtain a gain in freedom without introducing other modes of dimension multiplexing in the case of a single receiver. Therefore, research of a throughput improvement method of a multi-antenna laser communication system based on non-orthogonal codewords is necessary.
Disclosure of Invention
The invention provides a throughput improving method of a laser communication system for solving the problems, which mainly adopts a unique decodable code word set to encode information to be transmitted at a transmitting end and then transmits the encoded information, the code word set carries out power non-orthogonal superposition in a channel to obtain a superposed signal, and a receiving end demodulates the superposed signal in a mode of mapping the noiseless superposed pattern set into a code word to obtain complete and accurate transmitted information.
The throughput capacity improving method of the laser communication system provided by the invention comprises the following steps:
s1, at any kth moment, encoding to-be-transmitted information of a transmitter by adopting unique decoding and transmitting to a receiver, wherein a unique decodable code word set of an mth transmitter is represented as
Figure BDA0003818393280000021
Wherein M represents the serial number of the transmitter, M is more than or equal to 1 and less than or equal to M, and M represents the total number of the transmitters;
Figure BDA0003818393280000022
representing the uniquely decodable code word transmitted in the mth transmitter at time k,
Figure BDA0003818393280000023
s2, at the kth moment, completing non-orthogonal superposition in a power domain when the code word passes through a channel to obtain a superposed signal y k ；
S3, demodulating information to be transmitted at the kth moment;
step S31, determining a noiseless superimposed pattern set at the kth time according to the channel information at the kth time and the unique decodable code word sets of all M transmitters
Figure BDA0003818393280000024
Step S32, judging a noiseless superposed pattern at the kth moment according to the minimum Euclidean distance criterion
Figure BDA0003818393280000025
Step S33, adopting the operation of mapping the noiseless superimposed pattern to the code word to map the noiseless superimposed pattern
Figure BDA0003818393280000026
Mapping to codewords transmitted in all M transmitters
Figure BDA0003818393280000027
And then, the information to be transmitted is calculated, wherein,
Figure BDA0003818393280000028
representing the unique decodable code word transmitted by the mth (1 ≦ M ≦ M) transmitter at the kth time determined by the receiver.
Preferably, numerically, the non-orthogonal superposition of the power of the set of codewords is equivalent to the superposition of the power of the optical signal, the superposed signal y k The calculation formula of (a) is as follows:
Figure BDA0003818393280000029
wherein n is k Is equivalent Gaussian noise after photoelectric conversion of a receiving end at the kth moment,
Figure BDA00038183932800000210
represents channel information between the mth transmitter and the receiver at the kth time, and η represents a photoelectric conversion coefficient of the optical signal into an electrical signal in the receiver.
Preferably, in step S31, a noise-free superposition pattern set at the k-th time is determined
Figure BDA00038183932800000211
Comprises the following steps:
Figure BDA00038183932800000212
wherein, c m Representing a set of code words
Figure BDA00038183932800000213
Any one of the codewords.
Preferably, in step S32, the noise-free superimposed pattern at the k-th time is determined
Figure BDA00038183932800000215
The function of (d) is as follows:
Figure BDA00038183932800000214
wherein psi p Representing a set of noiseless superimposed patterns
Figure BDA0003818393280000033
Arbitrary element in (1), p represents a set of noise-free superimposed patterns
Figure BDA0003818393280000034
The sequence number of the middle element, argmin () represents a function that screens out the value of the argument when the objective function is at its minimum,
Figure BDA0003818393280000035
representing a set of noiseless superimposed patterns
Figure BDA0003818393280000036
The number of the elements (c) is,
Figure BDA0003818393280000037
equal to the product of the number of codewords per codeword set.
Preferably, in step S33, the mapping function of mapping the noise-free superposition pattern to the codeword is as follows:
Figure BDA0003818393280000031
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003818393280000032
representing a noise-free superimposed pattern
Figure BDA0003818393280000038
A function that maps to a codeword.
Compared with the prior art, the invention can obtain the following beneficial effects:
the invention effectively improves the throughput of the multi-antenna laser communication system by utilizing the non-orthogonal characteristic of the unique decodable code word, namely the number of correctly transmitted bits in unit time, and provides a new thought for demodulating and transmitting information by mapping the noiseless superposition pattern set into the code word.
Drawings
Fig. 1 is a multi-antenna laser communication system of an intensity modulation direct detection scheme for M transmitters according to an embodiment of the present invention;
fig. 2 is a flowchart of a throughput improvement method of a multi-antenna laser communication system according to an embodiment of the present invention;
FIG. 3 is a diagram of a noise-free overlay pattern according to an embodiment of the present invention
Figure BDA0003818393280000039
A data map mapped to codewords;
fig. 4 is a comparative graph of throughput enhancement effects of a multi-antenna laser communication system provided according to an embodiment of the present invention.
Wherein the reference numerals include: transmitter 1, receiver 2, channel 21, back-end processing module 22, reception lens 23, system throughput curve a using the method of the invention, system throughput curve a' without using the method of the invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are used for the same blocks. In the case of the same reference numerals, their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
It should be noted that: in this embodiment, the throughput is the number of bits that are correctly transmitted in a unit time, that is, the amount of information that is correctly transmitted in a unit time. Therefore, the throughput of the system under the noise-free state environmentIs composed of
Figure BDA0003818393280000041
Under the noisy state environment, the throughput of the system is R With noise ＝R Noiseless X (1-BER), where BER represents bit error rate.
Fig. 1 shows a structure of a multi-antenna laser communication system of an intensity modulation direct detection system of M transmitters provided according to an embodiment of the present invention.
As shown in fig. 1, the multi-antenna laser communication system of the intensity modulation direct detection system of M transmitters includes: a transmitter 1 and a receiver 2, the transmitter 1 is used for transmitting information and information coding; the receiver 2 is used for receiving the information delivered by the transmitter 1 and demodulating the coded information, the receiver 2 comprising: a channel 21, a back-end processing module 22 and a receiving lens 23, and there are 1 receiving lens 23 and 1 back-end processing module 22 in the receiver 2, which are the same as the total number of the transmitters 1. Each receiving lens 23 of the receiver 2 performs optical fiber coupling, and the multiple optical signals coupled into the optical fibers are combined and superposed to form one optical signal. The superimposed optical signals are demodulated in the back-end processing module 22 of the receiver 2, and signal information of each transmitter 1 is obtained.
In this embodiment, the multiplexing of the non-orthogonal transmissions is achieved by the non-orthogonal nature of the uniquely decodable set of codewords of the M transmitters 1, the codeword superposition being mathematically equivalent to the power superposition of the optical signals. For the m-th transmitter 1, it uses a uniquely decodable set of codewords
Figure BDA0003818393280000042
Set of code words
Figure BDA0003818393280000043
Included
Figure BDA0003818393280000044
The length of each code word is the same, M represents the total number of the transmitters 1, M represents the serial number of the transmitters 1, and M is more than or equal to 1 and less than or equal to M. Each transmitter 1 can complete the transmission of one codeword at each time instant.
Fig. 2 illustrates a throughput improvement method of a multi-antenna laser communication system according to an embodiment of the present invention.
As shown in fig. 1 and 2, the information transfer process of the laser communication system applying the method of the present invention at the k-th time is explained as follows:
s1, at any kth moment, the mth optical transmitter 1 encodes information to be transmitted by using unique decodable codes and transmits the encoded information to the receiver 2, and a code word set after encoding is represented as
Figure BDA0003818393280000054
The coded code word is represented as
Figure BDA0003818393280000055
And transmits it.
S2, the code word coded in the receiver 2 completes non-orthogonal superposition in a power domain when passing through a channel 21, and the superposed optical signal is subjected to photoelectric conversion to obtain a superposed signal y k Of the superimposed signal y k The calculation formula of (a) is as follows:
Figure BDA0003818393280000051
wherein n is k The equivalent gaussian noise after photoelectric conversion in the receiver 2 at the time k,
Figure BDA0003818393280000056
information representing the channel 21 of the mth transmitter 1 and receiver 2 at the kth time.
S3, the receiver 2 knows all the information of the channel 21, and can determine a noise-free superposition pattern set according to the information of the channel 21 and the M code word sets. Due to the unique interpretable nature of the code words, the number of elements of the noise-free superimposed pattern set is equal to the product of the number of code words per code word set, i.e.
Figure BDA0003818393280000057
The elements of the set of noiseless superimposed patterns are different from those transmitted by the M transmitters 1One-to-one mapping of the codewords. Therefore, the process of demodulating the information sent by the M transmitters 1 at the kth time by the receiver 2 is mainly divided into three steps:
step S31, according to the information of the channel 21 and the unique decodable code word sets of all M transmitters, determining the noiseless superimposed pattern set at the kth moment
Figure BDA0003818393280000058
Comprises the following steps:
Figure BDA0003818393280000052
wherein, c m Representing a set of code words
Figure BDA0003818393280000059
Determining a noise-free superposition pattern set at the k-th time
Figure BDA00038183932800000510
In the process of (c) m Need to be respectively replaced by code word sets
Figure BDA00038183932800000511
Where η represents the photoelectric conversion coefficient of the optical signal into the electrical signal in the receiver 2.
Step S32, judging a noiseless superposed pattern at the kth moment according to the minimum Euclidean distance criterion
Figure BDA00038183932800000512
Judging the noise-free superimposed pattern at the k-th moment
Figure BDA00038183932800000513
The function of (d) is as follows:
Figure BDA0003818393280000053
wherein psi p Representing a noise-free superimposed patternCollection of
Figure BDA00038183932800000514
Arbitrary element in (1), p represents a set of noise-free superimposed patterns
Figure BDA00038183932800000515
The sequence number of the middle element, argmin () represents a function that screens out the value of the argument when the objective function is at its minimum,
Figure BDA0003818393280000062
representing a set of noiseless superimposed patterns
Figure BDA0003818393280000063
The number of the elements of (a) is,
Figure BDA0003818393280000064
equal to the product of the number of codewords per codeword set.
Step S33, adopting the operation of mapping the noiseless superimposed pattern to the code word to map the noiseless superimposed pattern
Figure BDA0003818393280000065
Mapping to codewords transmitted in all M transmitters 1
Figure BDA0003818393280000066
And then, the transmitted information is calculated, and the mapping function of the mapping from the noise-free superposition pattern to the code word is as follows:
Figure BDA0003818393280000061
wherein the content of the first and second substances,
Figure BDA0003818393280000067
representing the unique decodable code word transmitted by the M (1. Ltoreq. M. Ltoreq. M) th transmitter 1 at the kth time instant decided by the receiver 2,
Figure BDA0003818393280000068
to representThe receiver 2 demodulates all the transmitted codewords of the M transmitters 1,
Figure BDA0003818393280000069
representing a noise-free superimposed pattern
Figure BDA00038183932800000610
A function that maps to a codeword.
FIG. 3 illustrates a noise-free overlay pattern provided in accordance with an embodiment of the present invention
Figure BDA00038183932800000611
Process data mapped to codewords.
As shown in fig. 3, taking the total number M =2 of the transmitters 1 as an example, the code word sets of the two transmitters 1 are:
Figure BDA00038183932800000612
the information of the channels 21 of the two transmitters 1 and receivers 2 at the k-th time is
Figure BDA00038183932800000613
And
Figure BDA00038183932800000614
at time k, then the noise-free superposition pattern set
Figure BDA00038183932800000615
Comprises the following steps:
{[0，0.5]，[0.8，1.3]，[0.5，0]，[1.3，0.8]，[0，0]，[0.8，0.8]}。
noise-free superimposed pattern set
Figure BDA00038183932800000616
Are different from each other and have
Figure BDA00038183932800000617
One element, the 6 elements and the codeword sets of two transmitters 1
Figure BDA00038183932800000618
And
Figure BDA00038183932800000619
the different codeword combinations of (a) produce a one-to-one mapping.
The mapping process is shown in fig. 3: each row in the figure represents a set of code words of a noise-free superposition pattern
Figure BDA00038183932800000620
And
Figure BDA00038183932800000621
mapping to the transmitted codeword of transmitter 1.
Figure BDA00038183932800000622
Coding the word
Figure BDA00038183932800000623
Mapping to a noise-free overlay pattern [0,0.5 ]]。
Figure BDA00038183932800000624
A noise-free overlay pattern [0,0.5 ] may also be applied]Mapping back to codewords
Figure BDA00038183932800000625
Fig. 4 shows a comparison of throughput enhancement effects of the multi-antenna laser communication system provided according to the embodiment of the present invention.
Taking the total number M =2 of the transmitters 1 as an example, the code word sets of the two transmitters 1 are respectively
Figure BDA0003818393280000071
After applying the method of the present invention, the normalized throughput data pair of the laser communication system is as shown in fig. 4:
in the figure, the vertical axis is throughput, the horizontal axis is signal-to-noise ratio, namely SNR, and a is a system throughput curve using the method of the invention; a 'is a system throughput curve a' without the method, and data comparison shows that the throughput of the system without the method is superior to that of the system without the method, and in the system without the method, because the receiver 2 only has one back-end processing module 22, the system cannot distinguish information transmitted by different transmitters, and therefore the system cannot have the degree-of-freedom gain, and therefore, the normalized throughput is close to 1bit/s/Hz when the signal to noise ratio is high. The degree of freedom gain of the system using the method of the invention benefits from the non-orthogonal characteristic of the unique decodable code word, so that the throughput is greater than 1, and the throughput is close to that of the system under the condition of high signal-to-noise ratio:
Figure BDA0003818393280000072
the invention can also be combined with other multiplexing technologies, such as multilevel modulation, angular momentum multiplexing and wavelength division multiplexing, thereby further improving the throughput of the system.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the invention. Variations, modifications, substitutions and alterations of the above-described embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (5)

1. A method for throughput enhancement in a laser communication system, comprising the steps of:
s1, at any kth moment, encoding to-be-transmitted information of a transmitter by adopting unique decoding and transmitting to a receiver, wherein a unique decodable code word set of an mth transmitter is represented as
Figure FDA0003818393270000011
Wherein M represents the serial number of the transmitter, M is more than or equal to 1 and less than or equal to M, and M represents the total number of the transmitters;
Figure FDA0003818393270000012
representing the uniquely decodable code word transmitted in the mth transmitter at time k,
Figure FDA0003818393270000013
s2, at the kth moment, completing non-orthogonal superposition in a power domain when the code word passes through a channel to obtain a superposed signal y k ；
S3, demodulating information to be transmitted at the kth moment;
step S31, determining a noiseless superimposed pattern set at the kth time according to the channel information at the kth time and the unique decodable code word sets of all M transmitters
Figure FDA0003818393270000014
Step S32, judging a noiseless superposed pattern at the kth moment according to the minimum Euclidean distance criterion
Figure FDA0003818393270000015
Step S33, adopting the operation of mapping the noiseless superimposed pattern to the code word to map the noiseless superimposed pattern
Figure FDA0003818393270000016
Mapping to codewords transmitted in all M of said transmitters
Figure FDA0003818393270000017
And then, the information to be transmitted is calculated, wherein,
Figure FDA0003818393270000018
representing the M (1. Ltoreq. M. Ltoreq. M) th transmitter at the kth time determined by the receiverA unique decodable codeword.
2. The throughput enhancement method for a laser communication system of claim 1, wherein numerically, the non-orthogonal superposition of power of the codeword sets is equivalent to the superposition of power of optical signals, and the superposed signal y is a signal k The calculation formula of (c) is as follows:
Figure FDA0003818393270000019
wherein n is k Is equivalent Gaussian noise after photoelectric conversion of a receiving end at the kth moment,
Figure FDA00038183932700000110
represents channel information between the mth transmitter and the receiver at the kth time, and η represents an optical-to-electrical conversion coefficient of an optical signal into an electrical signal in the receiver.
3. The throughput enhancement method for a laser communication system according to claim 1, wherein in step S31, the set of noiseless superimposed patterns at the k-th time is determined
Figure FDA00038183932700000111
Comprises the following steps:
Figure FDA0003818393270000021
wherein, c m Representing a set of code words
Figure FDA0003818393270000025
Any one of the codewords.
4. The throughput improvement method of the laser communication system according to claim 1, wherein in step S32, the noise-free overlay at the k-th time is determinedSample (A)
Figure FDA0003818393270000024
The function of (d) is as follows:
Figure FDA0003818393270000022
wherein psi p Representing the set of noiseless overlay patterns
Figure FDA0003818393270000028
P represents the set of noiseless superimposed patterns
Figure FDA0003818393270000026
The sequence number of the middle element, argmin (), represents a function, i.e., the value of the argument when the objective function is the minimum value is screened out,
Figure FDA0003818393270000027
representing the set of noiseless overlay patterns
Figure FDA0003818393270000029
The number of the elements of (a) is,
Figure FDA00038183932700000210
equal to the product of the number of codewords for each of said sets of codewords.
5. The throughput enhancement method of the laser communication system according to claim 1, wherein in step S33, the mapping function of the noiseless superimposed pattern to codeword mapping is as follows:
Figure FDA0003818393270000023
wherein the content of the first and second substances,
Figure FDA00038183932700000211
representing the noise-free superimposed pattern
Figure FDA00038183932700000212
A function that maps to a codeword.
CN202211033550.4A 2022-08-26 2022-08-26 Throughput improving method of laser communication system Pending CN115412174A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116938336A (en) * 2023-09-18 2023-10-24 中国科学院长春光学精密机械与物理研究所 Signal combining method for multi-antenna laser communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116938336A (en) * 2023-09-18 2023-10-24 中国科学院长春光学精密机械与物理研究所 Signal combining method for multi-antenna laser communication system
CN116938336B (en) * 2023-09-18 2023-12-19 中国科学院长春光学精密机械与物理研究所 Signal combining method for multi-antenna laser communication system

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