CN110224762A - A kind of impulsive synchronization method and system - Google Patents
A kind of impulsive synchronization method and system Download PDFInfo
- Publication number
- CN110224762A CN110224762A CN201810174074.5A CN201810174074A CN110224762A CN 110224762 A CN110224762 A CN 110224762A CN 201810174074 A CN201810174074 A CN 201810174074A CN 110224762 A CN110224762 A CN 110224762A
- Authority
- CN
- China
- Prior art keywords
- pulse
- light intensity
- special
- synchronization
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 86
- 230000008569 process Effects 0.000 claims description 18
- 238000010187 selection method Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 abstract description 20
- 238000004891 communication Methods 0.000 abstract description 14
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- 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
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
-
- 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
- H04B10/70—Photonic quantum communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Computing Systems (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of impulsive synchronization methods, comprising: the pulse of transmission is numbered in transmitting terminal, and partial pulse is encoded to special burst according to Chinese remainder theorem.The distribution for the special burst for including in the pulse train for the preset length that receiving end parsing transmitting terminal is sent；According to the distribution of the special burst, remainder equation group corresponding with special burst distribution is constructed, the remainder equation group is solved and obtains the first pulse number in the pulse train；The first pulse number is sent to the transmitting terminal and carries out impulsive synchronization matching；When receiving the signal for the successful match that the transmitting terminal is sent, the impulsive synchronization of the transmitting terminal and receiving end is realized.The above method, when communication equipment in receiving end and transmitting terminal changes, does not need to synchronize serial number correspondence or synchronization character is negotiated, pass through the impulsive synchronization that first pulse number carries out receiving end and transmitting terminal, reduce the synchronous time, is conducive to the establishment of star network.
Description
Technical Field
The invention relates to the technical field of quantum communication, in particular to a pulse synchronization method and a pulse synchronization system.
Background
With the development of digital communication technology, people have higher and higher requirements on communication technology, and the whole data communication system can work orderly, accurately and reliably. Both the transmitting and receiving sides of the data communication system must have a unified time standard, and in order to form the time standard, pulse synchronization of both the transmitting and receiving sides of the data communication system must be ensured, in the prior art, the pulse synchronization adopts a synchronous optical technology, and the synchronous optical technology refers to: the receiving end needs to complete initialization before the first optical signal of the transmitting end, and both the transmitting and receiving parties need to perform synchronization sequence number correspondence or synchronization character negotiation for a period of time before each communication, so as to determine the pulse correspondence between the transmitting and receiving parties.
The inventor researches the existing pulse synchronization technology to find that when a star quantum network is established, a condition that one transmitting terminal corresponds to a plurality of receiving terminals or a plurality of transmitting terminals correspond to one receiving terminal occurs, key accumulation between a group of transmitting and receiving parties needs to be completed in different time periods, and then the next transmitting terminal or receiving terminal is switched. However, once the devices at both ends of communication are changed, the devices are reinitialized, and the synchronization sequence number correspondence or synchronization character negotiation is performed again, which consumes much synchronization time and is not beneficial to the construction of the star quantum network.
Disclosure of Invention
In view of this, the present invention provides a pulse synchronization method, so as to solve the problem in the prior art that once devices at two ends of communication change, the device needs to be initialized again, and synchronization sequence number correspondence or synchronization character negotiation is performed again, which consumes much code forming time and is not beneficial to the construction of a star quantum network. The specific scheme is as follows:
a method of pulse synchronization, comprising:
the receiving end analyzes the distribution of special pulses contained in a pulse sequence with a preset length sent by the sending end;
constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and solving the remainder equation set to obtain a first pulse number in the pulse sequence;
sending the first pulse number to the sending end for pulse synchronization matching;
and when a signal which is successfully matched and sent by the sending end is received, the pulse synchronization of the sending end and the receiving end is realized.
In the foregoing method, preferably, the analyzing, by the receiving end, the special pulse included in the pulse sequence with the preset length sent by the sending end includes:
analyzing the pulse light intensity of each pulse in the pulse sequence, and taking each pulse light intensity as the pulse light intensity to be compared in sequence;
matching the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by adopting a preset selection method;
and determining the pulse corresponding to the successfully matched pulse light intensity to be compared as the special pulse.
In the above method, preferably, the process of generating the special light intensity comparison table by using the preset selection method includes:
sequentially numbering the pulse sequences sent by the sending end;
randomly selecting a plurality of integers of mutual prime numbers pairwise to construct a target array;
for each prime number, respectively modulating the pulse corresponding to the serial number which is the same as the prime number or has an integer proportional relation into a special pulse;
and acquiring the pulse light intensity of each special pulse, and storing the pulse light intensity and the prime number corresponding to the pulse light intensity into a special light intensity comparison table.
In the above method, preferably, the constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and solving the remainder equation set to obtain the first pulse number in the pulse sequence includes:
analyzing the pulse light intensity of the special pulse;
searching prime numbers corresponding to the pulse light intensity in the special light intensity comparison table;
determining the first pulse number in the pulse sequence and the remainder of the integral division of each prime number in the target array according to the prime numbers, and constructing a remainder equation set corresponding to the pulse sequence;
and solving the remainder equation set to obtain the first pulse number in the pulse sequence.
The method preferably further comprises:
and acquiring connection parameters established in the pulse synchronization process of the sending end and the receiving end, and storing the connection parameters.
A pulse synchronization system comprising:
the analysis module is used for analyzing the distribution of special pulses contained in a pulse sequence with a preset length sent by the sending end by the receiving end;
the solving module is used for constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses and solving the remainder equation set to obtain the first pulse number in the pulse sequence;
the sending module is used for sending the first pulse number to the sending end for pulse synchronization matching;
and the synchronization module is used for realizing pulse synchronization of the sending end and the receiving end when receiving the signal which is sent by the sending end and successfully matched.
In the above system, preferably, the analysis module includes:
the analyzing unit is used for analyzing the pulse light intensity of each pulse in the pulse sequence and taking each pulse light intensity as the pulse light intensity to be compared in sequence;
the matching unit is used for respectively matching the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by adopting a preset selection method;
and the determining unit is used for determining the pulse corresponding to the successfully matched pulse light intensity to be compared as the special pulse.
The above system, preferably, further comprises a generation unit, wherein the generation unit comprises:
a numbering subunit, configured to sequentially number the pulse sequences sent by the sending end;
the construction subunit is used for randomly selecting a plurality of integers of pairwise mutual prime numbers to construct a target array;
the modulation subunit is used for respectively modulating the pulses corresponding to the serial numbers which are the same as the prime numbers or have integer proportional relation into special pulses aiming at each prime number;
and the storage subunit is used for acquiring the pulse light intensity of each special pulse and storing the pulse light intensity and the prime number corresponding to the pulse light intensity into a special light intensity comparison table.
The system described above, preferably, the solving module includes:
the analysis unit is used for analyzing the pulse light intensity of the special pulse;
the searching unit is used for searching the prime number corresponding to the pulse light intensity in the special light intensity comparison table;
the construction unit is used for determining the first pulse number in the pulse sequence and the remainder of the integral division of each prime number in the target array according to the prime numbers, and constructing a remainder equation set corresponding to the pulse sequence;
and the solving unit is used for solving the remainder equation set to obtain the first pulse number in the pulse sequence.
The above system, preferably, further comprises:
and the storage module is used for acquiring the connection parameters established in the pulse synchronization process of the sending end and the receiving end and storing the connection parameters.
Compared with the prior art, the invention has the following advantages:
the invention discloses a pulse synchronization method, which comprises the following steps: when a receiving end receives a pulse sequence with a preset length sent by a sending end, the distribution of special pulses contained in the pulse sequence is analyzed, a remainder equation set corresponding to the special pulse distribution is constructed according to the distribution of the special pulses, the remainder equation set is solved to obtain a first pulse number in the pulse sequence, the first pulse number is sent to the sending end for pulse synchronization matching, and when a signal of successful matching sent by the sending end is received, the pulse synchronization of the sending end and the receiving end is realized. According to the method, in the process that the communication equipment of the receiving end and the transmitting end changes, the synchronization serial number correspondence or the synchronization character negotiation is not needed, the pulse synchronization of the receiving end and the transmitting end is directly carried out through the first pulse serial number in the pulse sequence, the time consumed by synchronization is reduced, and the star network is favorably established.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a pulse synchronization method disclosed in an embodiment of the present application;
FIG. 2 is a flowchart of another method of pulse synchronization disclosed in the embodiments of the present application;
FIG. 3 is a flowchart of another method of pulse synchronization disclosed in the embodiments of the present application;
FIG. 4 is a flowchart of another method of pulse synchronization disclosed in the embodiments of the present application;
FIG. 5 is a flowchart of another method of pulse synchronization disclosed in the embodiments of the present application;
fig. 6 is a block diagram of a pulse synchronization system according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The invention provides a pulse synchronization method, which is applied to the establishment process of a star-shaped quantum network. The execution subject of the method can be a controller or a processor, and the flow of the synchronization method is shown in fig. 1 and comprises the following steps:
s101, a receiving end analyzes distribution of special pulses contained in a pulse sequence with a preset length sent by a sending end;
in an embodiment of the present invention, the pulse sequence with the preset length at least includes a special pulse, and the distribution of the special pulse in the pulse sequence with the preset length is analyzed.
S102, constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and solving the remainder equation set to obtain a first pulse number in the pulse sequence;
in the embodiment of the invention, the remainder equation set is an equation set taking the number of the first pulse in the pulse sequence as an unknown quantity.
S103, sending the first pulse number to the sending end for pulse synchronization matching;
in the embodiment of the present invention, the pulse synchronization matching refers to searching for a pulse with the same number as the first pulse in a pulse sequence already sent by the sending end.
And S104, when receiving the signal which is transmitted by the transmitting end and successfully matched, realizing pulse synchronization of the transmitting end and the receiving end.
In the embodiment of the invention, the transmitting and receiving modes of the transmitting end and the receiving end can be various, and one transmitting end can correspond to one receiving end; a condition that one transmitting end corresponds to a plurality of receiving ends or a plurality of transmitting ends correspond to one receiving end. The condition that one transmitting end corresponds to a plurality of receiving ends or a plurality of transmitting ends correspond to one receiving end belongs to the construction category of the star network.
In the embodiment of the invention, when a receiving end receives a pulse sequence sent by a sending end, clock and intensity information are required to be recovered simultaneously, a pin tube of the receiving end converts synchronous light into a current signal and then converts the current signal into a voltage signal through TIA, one path of the voltage signal is sampled through ADC after buffer amplification, the other path of the voltage signal is recovered into a clock signal of the synchronous light through a discriminator and then is divided into two paths of clock signals through a clock distributor, one path of the clock signal is used for recovering the synchronous optical clock, the other path of the clock signal is used as a sampling clock of the ADC, optical power corresponding to the synchronous optical clock at the same time is obtained through delay compensation and AD sampling, and optical power information is used for analyzing the corresponding relation with the pulse sent by the sending.
In the embodiment of the invention, before the sending end sends the pulse sequence, the pulse sequence sent by the sending end is numbered in sequence according to a certain sequencing rule, the specific sequencing rule is determined according to the actual situation, and the determined principle is as follows: the number of each pulse in the pulse sequence is guaranteed to be unique. Therefore, the pulse sequence received by the receiving end has a corresponding pulse number, but neither the receiving end nor the transmitting end knows the first pulse number received by the receiving end, a remainder equation set which is used as an unknown number with the first pulse number in the pulse sequence needs to be established, the first pulse number is obtained by solving, the first pulse number is sent to the transmitting end, the transmitting end searches for a pulse matched with the first pulse number in the sent pulse sequence, and a signal successfully matched with the first pulse number is sent to the receiving end.
The invention discloses a pulse synchronization method, which comprises the following steps: when a receiving end receives a pulse sequence with a preset length sent by a sending end, the distribution of special pulses contained in the pulse sequence is analyzed, a remainder equation set corresponding to the special pulse distribution is constructed according to the distribution of the special pulses, the remainder equation set is solved to obtain a first pulse number in the pulse sequence, the first pulse number is sent to the sending end for pulse synchronization matching, and when a signal of successful matching sent by the sending end is received, the pulse synchronization of the sending end and the receiving end is realized. According to the method, in the process that the communication equipment of the receiving end and the transmitting end changes, the synchronization serial number correspondence or the synchronization character negotiation is not needed, the pulse synchronization of the receiving end and the transmitting end is directly carried out through the first pulse serial number in the pulse sequence, the time consumed by synchronization is reduced, and the star network is favorably established.
In the embodiment of the present invention, when a receiving end receives a pulse sequence with a preset length sent by a sending end, a flow of a method for determining a special pulse in the pulse sequence is shown in fig. 2, and the method includes the steps of:
s201, analyzing the pulse light intensity of each pulse in the pulse sequence, and taking each pulse light intensity as the pulse light intensity to be compared in sequence;
s202, matching the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by adopting a preset selection method;
s203, determining the pulse corresponding to the successfully matched pulse light intensity to be compared as a special pulse.
In the embodiment of the invention, a plurality of integers with mutual prime numbers in pairs are selected in advance to construct a target array, a group of integers m1, m2 and … … mn is selected as the integers with mutual prime numbers in pairs, and pulses with integral multiples of pulse numbers m1, m2 and … … mn are modulated into special pulses. For each prime number, respectively modulating the pulse corresponding to the serial number which is the same as the prime number or has an integer proportional relation into a special pulse, wherein the modulation principle is as follows: according to the difference of the pulse light intensity, the common pulse and the special pulse are distinguished, and the pulse light intensity of the special pulse corresponding to the number which is the same as the prime number or has an integer proportional relation is also the same or can fluctuate within a certain threshold value range. The pulse light intensity of each special pulse is obtained, the pulse light intensity and the prime number corresponding to the pulse light intensity are stored in a special light intensity comparison table, and for the same prime number, the pulse light intensity of the special pulse corresponding to the serial number which is the same as the prime number or has an integer relation is the same or fluctuates within a certain threshold value range, so that only one record can be stored in the special light intensity comparison table.
In the embodiment of the present invention, in S202, the intensities of the pulses to be compared are respectively matched with the intensities of the special pulses in the special intensity comparison table generated by using the preset selection method, and the matching principle is that the intensities of the pulses to be compared are the same or meet the fluctuation within a certain threshold range.
The method flow of the process of generating the special light intensity comparison table by adopting the preset selection method is shown in fig. 3, and comprises the following steps:
s301, sequentially numbering the pulse sequences sent by the sending end;
in the embodiment of the present invention, the numbering principle may be in various forms, and preferably, the numbering is performed on each pulse sent by the sending end by sequentially increasing the order of the natural numbers 1 to N.
S302, randomly selecting a plurality of integers of pairwise mutual prime numbers to construct a target array;
in the embodiment of the invention, the dimension of the target array can be selected at will, and the larger the dimension of the target array is, the longer the cycle of the repeated occurrence of the same special pulse is.
S303, aiming at each prime number, respectively modulating the pulse corresponding to the serial number which is the same as the prime number or has an integer proportional relation into a special pulse;
in the embodiment of the present invention, the pulse light intensity of the special pulse corresponding to the number having the same prime number or having an integer proportional relationship is distinguished from the pulse light intensity of the common pulse in the pulse sequence, and the specific principle is as follows: for the same prime number, the pulse light intensity of the special pulses corresponding to the serial numbers with the same prime number or the integral proportion relation is modulated into the same pulse light intensity or the pulse light intensity fluctuating within a certain threshold value range, and the pulse light intensity of the special pulses corresponding to different prime numbers is different for different prime numbers, namely the pulse light intensity of each special pulse has uniqueness.
S304, obtaining the pulse light intensity of each special pulse, and storing the pulse light intensity and the prime number corresponding to the pulse light intensity into a special light intensity comparison table.
In the embodiment of the present invention, the flowchart of the method for obtaining the first pulse number in the pulse sequence by constructing the remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulse and solving the remainder equation set is shown in fig. 4, and includes the steps of:
s401, analyzing the pulse light intensity of the special pulse;
s402, searching prime numbers corresponding to the pulse light intensity in the special light intensity comparison table;
s403, determining the first pulse number in the pulse sequence and the remainder of the integer division of each prime number in the target array according to the prime numbers, and constructing a remainder equation set corresponding to the pulse sequence;
s404, solving the remainder equation set to obtain the first pulse number in the pulse sequence.
In the embodiment of the present invention, the foregoing process is described in a case where one transmitting end corresponds to a plurality of receiving ends. The sender can keep the sending state continuously, and the receiver can analyze that the received pulse is the number of pulses through a shorter pulse sequence as long as the receiver is connected to the sender within the time M (not more than the time of M1, M2 and … … mn products). Theoretically, if the mark is divided by which number, the length of the shorter continuous pulse sequence should be equal to or greater than the maximum of M1, M2, … … mn, i.e. the pulse sequence is unique within M consecutive integers; but the length of the pulse sequence can be increased as a check to prevent errors or errors occurring in signal transmission and detection from causing erroneous judgment of the pulse number. The modulation and analysis mode, the length of M time, and the length of the pulse sequence required to restore synchronization for a particular pulse can all be adjusted, and an implementation based on a synchronization light is given below. This scheme is applicable to all types of QKD.
The above scheme is based on the Chinese remainder theorem, which ensures that the pulse sequence is unique within the continuous M integer ranges, and the main contents of the Chinese remainder theorem are as follows: let M1, M2, … …, mn be integers of two to two reciprocals, defining M as the product of all mi (M1 to mn). Then x has a unique solution over a range of M consecutive integers if the remainder a1, … … an is known as the unknown x divided by M1, M2, … … mn, respectively.
The specific example of signal modulation of the synchronous light based on the Chinese remainder theorem is as follows: (the relevant parameters can be adjusted according to the clock frequency, etc.)
The number length is selected, i.e. the divisor of two-fold reciprocity is selected. If eight numbers 97, 101, 103, 107, 109, 113, 127 and 139 are selected, the product of these 8 prime numbers is 23476728259356737, and the number is 55bit long integer, i.e. the pulse number of the transmitting end is numbered in such a way that the number is 0 to 23476728259356736. The repetition period of the position sequence of the special pulses is about 744 years according to the Chinese remainder theorem and a 1MHz clock.
The pulses whose pulse numbers in the synchronization light are divisionally divided by at least one of 97, 101, 103, 107, 109, 113, 127, 139 are modulated into special pulses. The transmitting end maintains a continuous transmission state regardless of whether it is received by the receiving end.
When the receiving end is connected to the network to receive the synchronous light pulse, the light intensity of each pulse read by the PIN tube is recorded, a detected section of synchronous pulse sequence Seq is analyzed, the remainder of eight divisors, namely 97, 101, 103, 107, 109, 113, 127 and 139, of the pulse number of the first pulse received is calculated according to the position of the special pulse in the synchronous pulse sequence Seq, and then the pulse number corresponding to the transmitting end is calculated by solving a congruence equation set, so that the purpose of clock synchronization is achieved.
The method for calculating the remainder is related to the modulation mode of the special pulse, and various modulation modes exist, and the following two implementation modes are preferred in the embodiment of the invention:
(1) one is a variety of special pulsing schemes: when encoding a particular pulse, it is necessary to distinguish which pulse number or numbers the pulse number may be divided by, thus requiring 2n different pulse intensities to distinguish. The pulse intensities of the pulse numbers which are evenly divided by 97, 101, 103, 107, 109, 113, 127 and 139 are respectively 1, 2, 4, 8, 16, 32, 64 and 128 (the numbers only represent intensity proportion), the intensity addition is carried out by evenly dividing by a plurality of numbers, the intensity addition is carried out by evenly dividing by 8 numbers, the 255 is carried out, and the 256 is carried out by the common pulse. According to the scheme, when the receiving end analyzes, only 139 (the largest divisor) continuous numbers are needed to calculate the pulse number of the first received pulse, so that the pulse corresponding relation between the transmitting end and the receiving end is restored. However, if the number of divisors to be selected is increased, the resolution of the pin may not be satisfactory. This scheme is suitable for numbering where the divisor value is larger, but smaller. For example, with a division of 1979, 1987, 1993, 1997, 1999, five primes, a repetition period of 992 years at a frequency of 1MHz is used.
Assuming that table 1 below shows the pulse intensities corresponding to 30 consecutive pulses, but we do not know what the number is, we can determine which of the numbers in table 1 can be evenly divided by 97, 101 and 103 according to the pulse intensities, which includes: divisible by 97 only, 101 only, 103 only, 97 and 101, 97 and 103, 101 and 103, 97, 101 and 103. Pulses that are divisible only by 97, only by 101, only by 103 modulate the intensity to 1, 2, 4, respectively, so that the intensity in the latter cases is 1+2, 1+4, 2+4, 1+2+ 4.
In the embodiment of the present invention, it is assumed that there are three pulses respectively whose light intensities are divisible by 97, 101 and 103 respectively. Specifically, as shown in table 1, the number of the pulse is divided by the number of the pulse, and the number of the first pulse is obtained: (assume that the divisor is only three 97, 101, 103)
| 97*a | 103*b | ||||||||
| 101*c | |||||||||
TABLE 1 pulse sequence integer division relation table
The third number in the table can be divided by 97, that is, the first number in the table should be divided by 97 with the remainder of 97-2 ═ 95 (the second number before 97)
The same reason is that the 7 th number is exactly divided by 103, so the remainder of the first number division 103 is 103-6-97
In the same way, the remainder of the division of the first number by 101 is 89-101
Therefore, assuming the first digit as X, the value of X can be found by solving the following remainder equation set.
The nature of the multi-specific pulse scheme is the same as the above-mentioned processing procedure, and is not described herein again.
(2) The other synchronous signal modulation mode is a single special pulse mode, the pulse number can be modulated into half of the energy of the common pulse by dividing the number by a certain divisor, the scheme needs a longer sequence to calculate the remainder, but only needs pulses with two intensities no matter how many divisors are needed. The remainder calculation process takes 7 as an example: grouping the pulse sequence Seq from a data block head pointer, and discarding data of each continuous 7 data groups which are m groups and less than one group; establishing a new 7-bit array n, and adding corresponding bits of the m arrays to fill in n, namely n [ i ] ═ x1[ i ] + x2[ i ] + … … + xm [ i ]; calculating the minimum value and the second minimum value in the array n, and satisfying a certain condition (the minimum value is one pulse intensity less than the second minimum value), wherein the position of the minimum value represents the position of the pulse number which can be divided by 7; further, the remainder of the division of the first pulse of the pulse sequence Seq by 7 is calculated.
Given that a set of data is evenly divided by 5, 7, 11 (assuming that the divisor is only 5, 7, and 11) as shown in table 2, table 2 contains 21 data, the number of the even divisions is marked as 0, and the other numbers are marked as 1, where the odd rows are actually unknown information X and only the even rows are known information Y.
For example, we require that the first number be divided by 7, we group the known 01 sequences into 7 groups (one group for each 7 numbers in order to calculate the remainder of what X is divided by)
TABLE 2 complete division information comparison table
Looking at the value of each column, only the column where the value of Y is always 0, the value of X can be divided exactly by 7
Therefore, we get the 5 th number of the data sequence to be divisible by 7, and then the remainder of the division of the first number by 7 is 7-4-3, and the rest of the process is consistent with the multipulse solution.
And calculating the first pulse number of the pulse sequence by adopting the method, sending the first pulse number to the sending end for pulse synchronization matching, and realizing the pulse synchronization of the sending end and the receiving end when receiving a signal of successful matching sent by the sending end.
In the embodiment of the present invention, before the sending end and the receiving end perform sending and receiving of the pulse sequence, the sending end and the receiving end need to be connected through an optical switch, fig. 5 is a work flow of quantum key distribution during switching of the optical switch, where delay scanning and polarization or phase feedback are omitted, if the connection is established for the first time, the process is as shown in a left path, and if the connection is established before and the device is not restarted due to an abnormality, the right step is performed. The steps on the left side are steps which are required to be carried out by the original synchronization scheme every time the optical switch is switched, and the steps on the right side are steps for switching the synchronization scheme of the patent to the saved connection, so that two steps which are long in time consumption and correspond to the initialization and the synchronization serial number are saved. The fast switching of different communication parties of the quantum network can be realized.
The method of using independent synchronous light to carry out synchronization firstly needs to be equipped with a synchronous light laser, thus increasing the development cost. In addition, the wavelength of the synchronous light is different from that of the quantum signal light, and then the synchronous light is coupled in an optical fiber for transmission through wavelength division multiplexing. Therefore, in addition to transmitting quantum signal light, the optical fiber between the two ends of the system also needs to transmit synchronous light of another wavelength, i.e. needs to occupy two channels. And the special synchronization pulses required for numbering the pulses by using the Chinese remainder theorem are very few, so that the synchronization pulses can be inserted into the signal light to realize clock synchronization.
In the continuous variable quantum key distribution, unmodulated data is needed for channel parameter estimation, so that the signal pulse without any modulation can be used as a synchronous pulse to realize the functions of pulse synchronization and channel noise estimation. The modulation and analysis of the synchronization pulses are synchronized using a modulation scheme similar to the single special pulse described above. The scheme based on the Chinese remainder theorem requires that each synchronous pulse for calculating the pulse number is detected by a receiving end, so that more photon numbers are needed, and the continuous variable quantum key distribution signal light pulse per se contains multiple photons, so that the application premise can be met.
Corresponding to the above pulse synchronization method, the present invention further provides a pulse synchronization system, and a block diagram of the structure of the system is shown in fig. 6, and the pulse synchronization system includes:
a parsing module 501, a solving module 502, a sending module 503 and a synchronization module 504.
Wherein,
the analyzing module 501 is configured to analyze, by the receiving end, distribution of special pulses included in a pulse sequence of a preset length sent by the sending end;
the solving module 502 is configured to construct a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and solve the remainder equation set to obtain a first pulse number in the pulse sequence;
the sending module 503 is configured to send the first pulse number to the sending end for pulse synchronization matching;
the synchronization module 504 is configured to implement pulse synchronization between the sending end and the receiving end when receiving a signal that matching is successful and sent by the sending end.
The invention discloses a pulse synchronization system, comprising: when a receiving end receives a pulse sequence with a preset length sent by a sending end, the distribution of special pulses contained in the pulse sequence is analyzed, a remainder equation set corresponding to the special pulse distribution is constructed according to the distribution of the special pulses, the remainder equation set is solved to obtain a first pulse number in the pulse sequence, the first pulse number is sent to the sending end for pulse synchronization matching, and when a signal of successful matching sent by the sending end is received, the pulse synchronization of the sending end and the receiving end is realized. In the system, in the process of changing the communication equipment of the receiving end and the transmitting end, the pulse synchronization of the receiving end and the transmitting end is directly carried out through the first pulse number in the pulse sequence without carrying out synchronization sequence number correspondence or synchronization character negotiation, so that the time consumed by synchronization is reduced, and the construction of a star network is facilitated.
In this embodiment of the present invention, the parsing module 501 includes:
parsing unit 505, matching unit 506 and determining unit 507.
Wherein,
the analyzing unit 505 is configured to analyze the pulse light intensity of each pulse in the pulse sequence, and sequentially use each pulse light intensity as a pulse light intensity to be compared;
the matching unit 506 is configured to match the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by using a preset selection method;
the determining unit 507 is configured to determine a pulse corresponding to the successfully matched pulse light intensity to be compared as a special pulse.
In this embodiment of the present invention, the pulse synchronization system further includes a generating unit 517, where the generating unit 517 includes:
a numbering subunit 508, a building subunit 509, a modulation subunit 510, and a storage subunit 511.
Wherein,
the numbering subunit 508 is configured to sequentially number the pulse sequences sent by the sending end;
the constructing subunit 509 is configured to arbitrarily select a plurality of integers of pairwise mutual prime numbers to construct a target array;
the modulation subunit 510 is configured to, for each prime number, modulate a pulse corresponding to a serial number that is the same as the prime number or has an integer proportional relationship with the prime number into a special pulse;
the storage subunit 511 is configured to obtain the pulse light intensity of each special pulse, and store the pulse light intensity and the prime number corresponding to the pulse light intensity in a special light intensity comparison table.
In this embodiment of the present invention, the solving module 502 includes:
a parsing unit 512, a lookup unit 513, a construction unit 514 and a solving unit 515.
Wherein,
the analyzing unit 512 is configured to analyze the pulse light intensity of the special pulse;
the searching unit 513 is configured to search the special light intensity comparison table for a prime number corresponding to the pulse light intensity;
the constructing unit 514 is configured to determine, according to the prime numbers, a remainder of an integral division between a first pulse number in the pulse sequence and each prime number in the target array, and construct a remainder equation set corresponding to the pulse sequence;
the solving unit 515 is configured to solve the remainder equation set to obtain a first pulse number in the pulse sequence.
In this embodiment of the present invention, the pulse synchronization system further includes a saving module 516, where the saving module 516 is configured to obtain a connection parameter established in the pulse synchronization process between the sending end and the receiving end, and save the connection parameter.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should be further noted that, in the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of pulse synchronization, comprising:
the receiving end analyzes the distribution of special pulses contained in a pulse sequence with a preset length sent by the sending end;
constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and solving the remainder equation set to obtain a first pulse number in the pulse sequence;
sending the first pulse number to the sending end for pulse synchronization matching;
and when a signal which is successfully matched and sent by the sending end is received, the pulse synchronization of the sending end and the receiving end is realized.
2. The method of claim 1, wherein the parsing, by the receiving end, the special pulse included in the pulse sequence with the preset length sent by the sending end comprises:
analyzing the pulse light intensity of each pulse in the pulse sequence, and taking each pulse light intensity as the pulse light intensity to be compared in sequence;
matching the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by adopting a preset selection method;
and determining the pulse corresponding to the successfully matched pulse light intensity to be compared as the special pulse.
3. The method of claim 2, wherein the step of generating the special light intensity comparison table by using the predetermined selection method comprises:
sequentially numbering the pulse sequences sent by the sending end;
randomly selecting a plurality of integers of mutual prime numbers pairwise to construct a target array;
for each prime number, respectively modulating the pulse corresponding to the serial number which is the same as the prime number or has an integer proportional relation into a special pulse;
and acquiring the pulse light intensity of each special pulse, and storing the pulse light intensity and the prime number corresponding to the pulse light intensity into a special light intensity comparison table.
4. The method according to claim 3, wherein the constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses, and the solving the remainder equation set to obtain the first pulse number in the pulse sequence comprises:
analyzing the pulse light intensity of the special pulse;
searching prime numbers corresponding to the pulse light intensity in the special light intensity comparison table;
determining the first pulse number in the pulse sequence and the remainder of the integral division of each prime number in the target array according to the prime numbers, and constructing a remainder equation set corresponding to the pulse sequence;
and solving the remainder equation set to obtain the first pulse number in the pulse sequence.
5. The method of any one of claims 1 to 4, further comprising:
and acquiring connection parameters established in the pulse synchronization process of the sending end and the receiving end, and storing the connection parameters.
6. A pulse synchronization system, comprising:
the analysis module is used for analyzing the distribution of special pulses contained in a pulse sequence with a preset length sent by the sending end by the receiving end;
the solving module is used for constructing a remainder equation set corresponding to the special pulse distribution according to the distribution of the special pulses and solving the remainder equation set to obtain the first pulse number in the pulse sequence;
the sending module is used for sending the first pulse number to the sending end for pulse synchronization matching;
and the synchronization module is used for realizing pulse synchronization of the sending end and the receiving end when receiving the signal which is sent by the sending end and successfully matched.
7. The system of claim 6, wherein the parsing module comprises:
the analyzing unit is used for analyzing the pulse light intensity of each pulse in the pulse sequence and taking each pulse light intensity as the pulse light intensity to be compared in sequence;
the matching unit is used for respectively matching the light intensity of the pulse to be compared with each special pulse light intensity in a special light intensity comparison table generated by adopting a preset selection method;
and the determining unit is used for determining the pulse corresponding to the successfully matched pulse light intensity to be compared as the special pulse.
8. The system according to claim 6 or 7, further comprising a generation unit comprising:
a numbering subunit, configured to sequentially number the pulse sequences sent by the sending end;
the construction subunit is used for randomly selecting a plurality of integers of pairwise mutual prime numbers to construct a target array;
the modulation subunit is used for respectively modulating the pulses corresponding to the serial numbers which are the same as the prime numbers or have integer proportional relation into special pulses aiming at each prime number;
and the storage subunit is used for acquiring the pulse light intensity of each special pulse and storing the pulse light intensity and the prime number corresponding to the pulse light intensity into a special light intensity comparison table.
9. The system of claim 8, wherein the solving module comprises:
the analysis unit is used for analyzing the pulse light intensity of the special pulse;
the searching unit is used for searching the prime number corresponding to the pulse light intensity in the special light intensity comparison table;
the construction unit is used for determining the first pulse number in the pulse sequence and the remainder of the integral division of each prime number in the target array according to the prime numbers, and constructing a remainder equation set corresponding to the pulse sequence;
and the solving unit is used for solving the remainder equation set to obtain the first pulse number in the pulse sequence.
10. The system of claim 6, further comprising:
and the storage module is used for acquiring the connection parameters established in the pulse synchronization process of the sending end and the receiving end and storing the connection parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810174074.5A CN110224762B (en) | 2018-03-02 | 2018-03-02 | Pulse synchronization method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810174074.5A CN110224762B (en) | 2018-03-02 | 2018-03-02 | Pulse synchronization method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110224762A true CN110224762A (en) | 2019-09-10 |
| CN110224762B CN110224762B (en) | 2021-11-30 |
Family
ID=67822071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810174074.5A Active CN110224762B (en) | 2018-03-02 | 2018-03-02 | Pulse synchronization method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110224762B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600825A (en) * | 2020-05-16 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equal interval time pulse |
| CN112054796A (en) * | 2020-09-09 | 2020-12-08 | 北京理工大学 | Coding single-distribution type multi-channel ADC synchronization method |
| CN112414548A (en) * | 2021-01-21 | 2021-02-26 | 浙江九州量子信息技术股份有限公司 | APD digital avalanche signal extraction method with synchronous correlated sampling |
| CN112436900A (en) * | 2020-10-30 | 2021-03-02 | 中国石油天然气集团有限公司 | Data transmission method and device |
| CN112564820A (en) * | 2019-09-26 | 2021-03-26 | 浙江绍兴苏泊尔生活电器有限公司 | Signal receiving and transmitting method and device and electric kettle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688109A (en) * | 2005-05-16 | 2005-10-26 | 哈尔滨工业大学 | Relatively prime mode parallel counter based on congruence theory |
| WO2011083288A1 (en) * | 2010-01-08 | 2011-07-14 | Kabushiki Kaisha Toshiba | Quantum communication system and method |
| CN108415012A (en) * | 2018-02-06 | 2018-08-17 | 中国人民解放军战略支援部队信息工程大学 | A kind of single channel Frequency Hopping Signal method for separating and device |
-
2018
- 2018-03-02 CN CN201810174074.5A patent/CN110224762B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688109A (en) * | 2005-05-16 | 2005-10-26 | 哈尔滨工业大学 | Relatively prime mode parallel counter based on congruence theory |
| WO2011083288A1 (en) * | 2010-01-08 | 2011-07-14 | Kabushiki Kaisha Toshiba | Quantum communication system and method |
| CN108415012A (en) * | 2018-02-06 | 2018-08-17 | 中国人民解放军战略支援部队信息工程大学 | A kind of single channel Frequency Hopping Signal method for separating and device |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564820A (en) * | 2019-09-26 | 2021-03-26 | 浙江绍兴苏泊尔生活电器有限公司 | Signal receiving and transmitting method and device and electric kettle |
| CN112564820B (en) * | 2019-09-26 | 2024-04-12 | 浙江绍兴苏泊尔生活电器有限公司 | Signal receiving and transmitting method and device and electric kettle |
| CN111600825A (en) * | 2020-05-16 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equal interval time pulse |
| CN111600825B (en) * | 2020-05-16 | 2023-05-12 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equidistant time pulses |
| CN112054796A (en) * | 2020-09-09 | 2020-12-08 | 北京理工大学 | Coding single-distribution type multi-channel ADC synchronization method |
| CN112054796B (en) * | 2020-09-09 | 2022-10-28 | 北京理工大学 | Coding single-distribution type multi-channel ADC synchronization method |
| CN112436900A (en) * | 2020-10-30 | 2021-03-02 | 中国石油天然气集团有限公司 | Data transmission method and device |
| CN112436900B (en) * | 2020-10-30 | 2022-10-04 | 中国石油天然气集团有限公司 | Data transmission method and device |
| CN112414548A (en) * | 2021-01-21 | 2021-02-26 | 浙江九州量子信息技术股份有限公司 | APD digital avalanche signal extraction method with synchronous correlated sampling |
| CN112414548B (en) * | 2021-01-21 | 2021-04-02 | 浙江九州量子信息技术股份有限公司 | APD digital avalanche signal extraction method with synchronous correlated sampling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110224762B (en) | 2021-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110224762B (en) | Pulse synchronization method and system | |
| Yang et al. | Performance comparison of multiwavelength CDMA and WDMA+ CDMA for fiber-optic networks | |
| CN110224775B (en) | Method, device and equipment for determining time information | |
| AU647343B2 (en) | Novel spread spectrum codec apparatus and method | |
| CN105103483A (en) | Pulse amplitude modulation (PAM) bit error test and measurement | |
| CN112449748B (en) | Quantum key distribution system and method | |
| CN113541819B (en) | Time synchronization system for quantum key distribution | |
| Zhang et al. | Timing and synchronisation for high‐loss free‐space quantum communication with Hybrid de Bruijn Codes | |
| CN102148777B (en) | Simplified acquisition apparatus and method for a bluetooth receiver | |
| CN113302873A (en) | Apparatus and method for processing data in a quantum key distribution system | |
| JP2009218744A (en) | Method and system of frame synchronization for feeble optical communication | |
| EP3787220B1 (en) | Quantum communication synchronization and alignment procedure | |
| CN114337912A (en) | Data processing method and data processing equipment in passive optical network system | |
| Shum et al. | Design and construction of protocol sequences: Shift invariance and user irrepressibility | |
| US20130003886A1 (en) | Method for generating and detecting preamble, and digital communication system based on the same | |
| EP4062580A1 (en) | Quantum bit decoding apparatus, system and method | |
| US20080267634A1 (en) | 9b10b Code for Passive Optical Networks | |
| Stefanovic et al. | On the search for a sequence from a predefined set of sequences in random and framed data streams | |
| RU2344544C2 (en) | Method of discrete information transfer | |
| US10419261B2 (en) | Decoding method and apparatus, and system therefor | |
| Georghiades | On PPM sequences with good autocorrelation properties | |
| CN115296971B (en) | Ultra-low complexity receiver consisting of permutated array signal constellations in a communication system | |
| RU2752003C1 (en) | Device for receiving relative phase telegraphy signals with increased immunity | |
| CN110474718A (en) | A kind of data-encoding scheme, synchronous method, system and communication system | |
| EP1187341A2 (en) | Synchronization loss detection in a V.34 receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |