CN112615711B - An Asynchronous Secure Communication System - Google Patents

An Asynchronous Secure Communication System Download PDF

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CN112615711B
CN112615711B CN202011439669.2A CN202011439669A CN112615711B CN 112615711 B CN112615711 B CN 112615711B CN 202011439669 A CN202011439669 A CN 202011439669A CN 112615711 B CN112615711 B CN 112615711B
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CN112615711A (en
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李齐良
林朗
奚小虎
胡淼
唐向宏
曾然
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Tianyi Safety Technology Co Ltd
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Hangzhou Dianzi University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
    • 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
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection

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Abstract

The invention relates to an asynchronous secret communication system, which comprises a sending end and a receiving end, wherein the sending end is in communication connection with the receiving end; the second electric chaotic signal generating device, the first delayer and the encoder are sequentially connected; the encoder is connected with the modulator, the original signal input end receives an original signal and is connected with the signal processor, the signal processor is connected with the modulator, and the modulator is connected with the transmitter; the receiving end is provided with a modulator, a second delayer, a comparator and a demodulator, the receiver, the second delayer, the comparator and the demodulator are sequentially connected, and the receiver is also directly connected with the comparator; the signal transmitted by the transmitter is received by the receiver. The system of the invention realizes chaotic secure communication without synchronization of receiving ends; the method has the characteristics of low cost, stable performance, low error rate and strong confidentiality.

Description

一种非同步的保密通信系统An Asynchronous Secure Communication System

技术领域technical field

本发明属于光信息技术领域，具体涉及一种非同步的保密通信系统。The invention belongs to the technical field of optical information, and in particular relates to an asynchronous secure communication system.

背景技术Background technique

近年来，随着通信技术的快速进步，我们的日常生活已经离不开信息世界，那么信息的高速与安全传输就变得极其重要了。由于混沌序列具有类噪声、相关性强、长期行为不可预测、初值敏感性等优势，在保密通信领域的应用较好。传统的混沌通信系统需要进行同步，这就要求发送端和接收端利用混沌同步产生完全相同的混沌序列，即在发射端和接收端都需要有产生混沌信号的设备，使通信系统整体更为笨重、成本较高。为此，需要有一种保密通信方法与系统，其可以不需要接收端具有与发射端同步的混沌信号也能解调出原始信息信号，节省了成本、提高便携性。In recent years, with the rapid progress of communication technology, our daily life has become inseparable from the world of information, so the high-speed and safe transmission of information has become extremely important. Because chaotic sequence has the advantages of noise-like, strong correlation, unpredictable long-term behavior, and initial value sensitivity, it is well used in the field of secure communication. The traditional chaotic communication system needs to be synchronized, which requires the sender and the receiver to use chaotic synchronization to generate exactly the same chaotic sequence, that is, both the transmitter and the receiver need to have devices that generate chaotic signals, which makes the overall communication system more bulky. ,higher cost. Therefore, there is a need for a secure communication method and system, which can demodulate the original information signal without the need for the receiving end to have a chaotic signal synchronized with the transmitting end, thereby saving costs and improving portability.

发明内容SUMMARY OF THE INVENTION

基于现有技术中存在的上述缺点和不足，本发明的目的之一是至少解决现有技术中存在的上述问题之一或多个，换言之，本发明的目的之一是提供满足前述需求之一或多个的一种非同步的保密通信系统。Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objectives of the present invention is to at least solve one or more of the above-mentioned problems existing in the prior art. In other words, one of the objectives of the present invention is to provide one of the aforementioned requirements or more of an asynchronous secure communication system.

为了达到上述发明目的，本发明采用以下技术方案：In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

一种非同步的保密通信系统，包括发送端和接收端，发送端和接收端间通信连接，发送端设有第一电混沌信号发生装置、第二电混沌信号发生装置、第一延时器、编码器、调制器、信号处理器、原始信号输入端；第一电混沌信号发生装置、编码器依次连接；第二电混沌信号发生装置、第一延时器、编码器依次连接；编码器与调制器连接，原始信号输入端接受原始信号、与信号处理器连接，信号处理器与调制器连接，调制器与发送器连接；An asynchronous secure communication system includes a sending end and a receiving end, the sending end and the receiving end are connected for communication, and the sending end is provided with a first electrical chaotic signal generating device, a second electrical chaotic signal generating device, and a first delayer , encoder, modulator, signal processor, original signal input terminal; the first electrical chaotic signal generating device and the encoder are connected in sequence; the second electrical chaotic signal generating device, the first delayer and the encoder are connected in sequence; the encoder Connected with the modulator, the original signal input terminal accepts the original signal, is connected with the signal processor, the signal processor is connected with the modulator, and the modulator is connected with the transmitter;

接收端设有接收端调制器、第二延时器、比较器、解调器，接收器、第二延时器、比较器、解调器依次连接，接收器还直接与比较器连接；发送器发送的信号会由接收器接收。The receiving end is provided with a receiving end modulator, a second delayer, a comparator and a demodulator, the receiver, the second delayer, the comparator and the demodulator are connected in sequence, and the receiver is also directly connected with the comparator; The signal sent by the transmitter will be received by the receiver.

作为优选方案，第一电混沌信号发生装置包括依次连接的第一混沌激光器、第一光电转换器，第一光电转换器与编码器连接；第二电混沌信号发生装置包括相连接的第二混沌激光器、第二光电转换器，第二光电转换器与第一延时器连接。As a preferred solution, the first electrical chaotic signal generating device includes a first chaotic laser and a first photoelectric converter connected in sequence, and the first photoelectric converter is connected to the encoder; the second electrical chaotic signal generating device includes a second chaotic connected The laser, the second photoelectric converter, and the second photoelectric converter are connected with the first delay device.

作为优选方案，编码器的工作方式为：根据直接送至编码器的第一电混沌信号和经过延时器延时后送至编码器的第二电混沌信号的比较结果选择四种不同的编码方式之一。As a preferred solution, the working mode of the encoder is as follows: according to the comparison result of the first electrical chaotic signal directly sent to the encoder and the second electrical chaotic signal sent to the encoder after being delayed by the delay device, four different codes are selected. one of the ways.

作为优选方案，编码器的四种编码方式分别为：设直接送至编码器的第一电混沌信号为x1(n)，经过延时器延时后送至编码器的第二电混沌信号为x2(n+1)，n表示一个离散的时刻，取

Figure GDA0003572752160000021
的最小值与最大值A、E，在A-E中依序选取三个区间值B、C、D，编码器根据各个时刻的
Figure GDA0003572752160000022
值所属于(A,B)(B,C)(C,D)(D,E)的区间对应地对信号进行编码，使编码后的信号x(n)、x(n+1)为x(n)＝-|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝-|x1(n)|、x(n+1)＝|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝|x2(n+1)|。As a preferred solution, the four coding modes of the encoder are: set the first electrical chaotic signal directly sent to the encoder as x 1 (n), and the second electrical chaotic signal sent to the encoder after being delayed by the delay device is x 2 (n+1), n represents a discrete moment, take
Figure GDA0003572752160000021
The minimum and maximum values A, E of , select three interval values B, C, D in sequence in AE, and the encoder
Figure GDA0003572752160000022
The interval where the value belongs to (A,B)(B,C)(C,D)(D,E) encodes the signal correspondingly, so that the encoded signals x(n) and x(n+1) are x (n)=-|x 1 (n)|, x(n+1)=-|x 2 (n+1)|; x(n)=-|x 1 (n)|, x(n+1 )=|x 2 (n+1)|; x(n)=|x 1 (n)|, x(n+1)=-|x 2 (n+1)|; x(n)=|x 1 (n)|, x(n+1)=|x 2 (n+1)|.

作为优选方案，信号处理器接收原始信号输入端发送的由“0”、“1”组成的原始信号，将其中的“0”变为“-1”，“1”依然保持为“1”。As a preferred solution, the signal processor receives the original signal composed of "0" and "1" sent by the original signal input terminal, and changes the "0" into "-1", and the "1" remains as "1".

作为优选方案，比较器的工作方式为，设接收器直接送至比较器的调制信号为l(n)、经第二延时器延时后送至比较器的延时调制信号为l(n+1)，n表示一个离散的时刻，取

Figure GDA0003572752160000031
的最小值与最大值A、E，在A-E中依序选取三个区间值B、C、D，比较各个时刻的
Figure GDA0003572752160000032
分别属于(A,B)(B,C)(C,D)(D,E)中的哪一个区间。As a preferred solution, the working mode of the comparator is as follows: the modulated signal directly sent by the receiver to the comparator is 1(n), and the delayed modulated signal sent to the comparator after being delayed by the second delayer is 1(n). +1), n represents a discrete moment, take
Figure GDA0003572752160000031
The minimum and maximum values A, E of , select three interval values B, C, D in sequence in AE, and compare the
Figure GDA0003572752160000032
Which interval in (A,B)(B,C)(C,D)(D,E) belong to.

作为优选方案，解调器中设有四种解调电路，对应于比较器得出的

Figure GDA0003572752160000033
所属区间，依序分别使用解调电路1、2、3、4；解调电路1的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝1；解调电路2的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝0；解调电路3的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝0；解调电路4的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝1。将各个时刻的s(n)、s(n+1)依次连接得到最终的还原信号
Figure GDA0003572752160000034
As a preferred solution, the demodulator is provided with four demodulation circuits, corresponding to the
Figure GDA0003572752160000033
In the interval, demodulation circuits 1, 2, 3, and 4 are used in sequence; the algorithm of demodulation circuit 1 is: when l(n)<0 and l(n+1)<0, let the restored signal s(n )=1, s(n+1)=0; when l(n)<0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=1; When l(n)>0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)>0 and l(n+1) )>0, let the restored signal s(n)=0, s(n+1)=1; the algorithm of demodulation circuit 2 is: when l(n)<0 and l(n+1)<0, Let the restoration signal s(n)=1, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restoration signal s(n)=1, s(n +1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=0, s(n+1)=1; when l(n)>0 And when l(n+1)>0, let the restored signal s(n)=0, s(n+1)=0; the algorithm of demodulation circuit 3 is: when l(n)<0 and l(n+ 1) When <0, let the restoration signal s(n)=0, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restoration signal s(n) =0, s(n+1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=1, s(n+1)=1; when When l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=0; the algorithm of the demodulation circuit 4 is: when l(n)< 0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)<0 and l(n+1)>0, let Restore signal s(n)=0, s(n+1)=1; when l(n)>0 and l(n+1)<0, let restore signal s(n)=1, s(n+ 1)=0; when l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=1. Connect s(n) and s(n+1) at each moment in turn to obtain the final restoration signal
Figure GDA0003572752160000034

作为优选方案，解调器中设有与编码器按四个区间编码相对应的四种解调电路。As a preferred solution, the demodulator is provided with four kinds of demodulation circuits corresponding to the coding by the encoder in four intervals.

作为优选方案，第一混沌激光器的延迟为2.67ns，第二混沌激光器的延迟为1.50ns；第一混沌激光器的阈值电流为32mA，第二混沌激光器的阈值电流为14.7mA；第一混沌激光器的透明载流子数为1.6633×108，第二混沌激光器的透明载流子数为1.5000×108；第一混沌激光器及第二混沌激光器的工作波长为1550nm。As a preferred solution, the delay of the first chaotic laser is 2.67ns, and the delay of the second chaotic laser is 1.50ns; the threshold current of the first chaotic laser is 32mA, and the threshold current of the second chaotic laser is 14.7mA; The number of transparent carriers is 1.6633×10 8 , and the number of transparent carriers of the second chaotic laser is 1.5000×10 8 ; the operating wavelengths of the first chaotic laser and the second chaotic laser are 1550 nm.

本发明与现有技术相比，有益效果是：Compared with the prior art, the present invention has the following beneficial effects:

1)实现了接收端不需要同步的混沌保密通信；1) Realize the chaotic secure communication that the receiver does not need to synchronize;

2)具有成本低、性能稳定、误码率低、保密性强的特点。2) It has the characteristics of low cost, stable performance, low bit error rate and strong confidentiality.

附图说明Description of drawings

图1是本发明实施例1的一种非同步的保密通信系统的结构框图；1 is a structural block diagram of an asynchronous secure communication system according to Embodiment 1 of the present invention;

图2是本发明实施例1的一种非同步的保密通信系统的调制信号的信号图；2 is a signal diagram of a modulated signal of an asynchronous secure communication system according to Embodiment 1 of the present invention;

图3是本发明实施例1的一种非同步的保密通信系统的原始信号的信号图；3 is a signal diagram of an original signal of an asynchronous secure communication system according to Embodiment 1 of the present invention;

图4是本发明实施例1的一种非同步的保密通信系统的还原信号的信号图。FIG. 4 is a signal diagram of a restored signal of an asynchronous secure communication system according to Embodiment 1 of the present invention.

具体实施方式Detailed ways

为了更清楚地说明本发明实施例，下面将对照附图说明本发明的具体实施方式。显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图，并获得其他的实施方式。In order to describe the embodiments of the present invention more clearly, the following will describe specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts, and obtain other implementations.

实施例1：如图1所示，本实施例涉及一种非同步的保密通信系统，由可通信连接的发射端和接收端构成，发射端包括第一混沌激光器11和第二混沌激光器21；第一光电转换器12，第二光电转换器22；第一延时器23，编码器3，调制器5，信号处理器41。接收端包括第二延时器6，比较器7，解调器8。第一延时器23和第二延时器6的规格参数相同。第一混沌激光器11、第一光电转换器12、编码器3依次连接；第二混沌激光器21、第二光电转换器22、第一延时器23、编码器3依次连接；编码器3与调制器5连接，原始信号输入端接受原始信号40、与信号处理器41连接，信号处理器41与调制器5连接，调制器5与发送器连接。第一混沌激光器11和第二混沌激光器21的参数不相同，第一混沌激光器11的延迟为2.67ns，阈值电流为32mA，透明载流子数为1.6633×108，第二混沌激光器21的延迟为1.50s，阈值电流为14.7mA，透明载流子数为1.5000×108。第一混沌激光器11和和第二混沌激光器21的工作波长均为1550nm。通过使用两个混沌激光器产生两个不同的光混沌信号，经过光电转化后变为电混沌信号。可以生成比单纯使用电路所产生的混沌信号更为复杂的原始混沌信号。Embodiment 1: As shown in FIG. 1 , this embodiment relates to an asynchronous secure communication system, consisting of a transmitter and a receiver that can be communicatively connected, and the transmitter includes a first chaotic laser 11 and a second chaotic laser 21; The first photoelectric converter 12 , the second photoelectric converter 22 ; the first delay device 23 , the encoder 3 , the modulator 5 , and the signal processor 41 . The receiving end includes a second delay device 6 , a comparator 7 , and a demodulator 8 . The specifications and parameters of the first delay device 23 and the second delay device 6 are the same. The first chaotic laser 11, the first photoelectric converter 12, and the encoder 3 are connected in sequence; the second chaotic laser 21, the second photoelectric converter 22, the first delay 23, and the encoder 3 are connected in sequence; the encoder 3 is connected to the modulation The original signal input terminal receives the original signal 40 and is connected with the signal processor 41, the signal processor 41 is connected with the modulator 5, and the modulator 5 is connected with the transmitter. The parameters of the first chaotic laser 11 and the second chaotic laser 21 are different. The delay of the first chaotic laser 11 is 2.67ns, the threshold current is 32mA, and the number of transparent carriers is 1.6633×10 8 . The delay of the second chaotic laser 21 is 1.50s, the threshold current is 14.7mA, and the number of transparent carriers is 1.5000×10 8 . The operating wavelengths of the first chaotic laser 11 and the second chaotic laser 21 are both 1550 nm. Two different optical chaotic signals are generated by using two chaotic lasers, which become electrical chaotic signals after photoelectric conversion. Primitive chaotic signals can be generated that are more complex than chaotic signals generated by purely using circuits.

在发射端中，第一混沌激光器11产生第一混沌光信号，发送至第一光电转换器12转换为第一电混沌信号，第二混沌激光器21产生第二混沌光信号，发送至第一光电转换器22转换为第二电混沌信号。第一电混沌信号直接送到编码器3。第二电混沌信号先送至第一延时器，经延时以后送至编码器3中。In the transmitting end, the first chaotic laser 11 generates a first chaotic optical signal, which is sent to the first photoelectric converter 12 to be converted into a first electrical chaotic signal, and the second chaotic laser 21 generates a second chaotic optical signal, which is sent to the first photoelectric converter The converter 22 converts into a second electrical chaotic signal. The first electrical chaotic signal is directly sent to the encoder 3 . The second electrical chaotic signal is first sent to the first delay device, and then sent to the encoder 3 after being delayed.

在编码器3中，设直接送至编码器3的第一电混沌信号为x1(n)，延时后送至编码器3的第二电混沌信号为x2(n+1)，将第一电混沌信号与延迟后的第二电混沌信号相除，并将相除的结果取绝对值

Figure GDA0003572752160000051
设相除结果的最小值为A，最大值为E，在A-E中从小到大依序选取三个区间值B、C、D，将[A,E]分为4个范围(即(A,B)(B,C)(C,D)(D,E))，对应每个范围进行不同的编码，若
Figure GDA0003572752160000052
分别属于(A,B)(B,C)(C,D)(D,E)，使编码后的信号x(n)、x(n+1)为x(n)＝-|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝-|x1(n)|、x(n+1)＝|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝|x2(n+1)|。从而使得编码出的信号能够不断切换。编码完成后将编码后的信号发送出去。经过上述延时后比较、再对信号进行编码，可以实现不同的编码方式，从而使发送的信号以各种不同的方式切换。In the encoder 3, it is assumed that the first electrical chaotic signal sent directly to the encoder 3 is x 1 (n), the second electrical chaotic signal sent to the encoder 3 after a delay is x 2 (n+1), and Divide the first electrical chaotic signal and the delayed second electrical chaotic signal, and take the absolute value of the division result
Figure GDA0003572752160000051
Set the minimum value of the division result to be A, and the maximum value to be E. In AE, select three interval values B, C, and D in order from small to large, and divide [A, E] into 4 ranges (ie (A, E) B)(B,C)(C,D)(D,E)), different coding is performed for each range, if
Figure GDA0003572752160000052
belong to (A,B)(B,C)(C,D)(D,E) respectively, so that the encoded signals x(n) and x(n+1) are x(n)=-|x 1 ( n)|, x(n+1)=-|x 2 (n+1)|; x(n)=-|x 1 (n)|, x(n+1)=|x 2 (n+1 )|; x(n)=|x 1 (n)|, x(n+1)=-|x 2 (n+1)|; x(n)=|x 1 (n)|, x(n +1)=|x 2 (n+1)|. Thus, the encoded signal can be switched continuously. After the encoding is completed, the encoded signal is sent out. After comparing and encoding the signal after the above delay, different encoding modes can be implemented, so that the transmitted signal can be switched in various ways.

原始信号40经过信号处理器41处理，在信号处理器41中，原始信号40中的“0”变为“-1”，“1”依然保持为“1”。处理后的原始信号与编码器3发出的编码信号共同发送至调制器5，由调制器5相乘，生成的调制信号图像如图2所示，该调制信号用于信号传输，由发送器发送至接收端。The original signal 40 is processed by the signal processor 41. In the signal processor 41, "0" in the original signal 40 becomes "-1", and "1" remains as "1". The processed original signal and the encoded signal sent by the encoder 3 are sent to the modulator 5 together, and are multiplied by the modulator 5. The resulting modulated signal image is shown in Figure 2. The modulated signal is used for signal transmission and is sent by the transmitter. to the receiving end.

接收端如图1所示，在接收端，接收器、第二延时器6、比较器7、解调器8依次连接，接收器还直接与比较器7连接，将所接收到的调制器5发出的调制信号分为两路，一路直接送至比较器7，另一路经过第二延时器6延时后再送至比较器7，在比较器7中，未经过延时的信号l(n)与经过第二延时器6延时的信号l(n+1)相除、取绝对值，并判断其落在编码时划分的4个范围(即(A,B)(B,C)(C,D)(D,E))中的哪个范围，当

Figure GDA0003572752160000061
分别属于(A,B)(B,C)(C,D)(D,E)时，对应的分别使用解调电路1、2、3、4；对应于比较器7比较出的
Figure GDA0003572752160000062
所属区间，对应的依序分别使用解调电路1、2、3、4；解调电路1的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝1；解调电路2的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝0；解调电路3的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝0；解调电路4的算法为：当l(n)<0且l(n+1)<0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)<0且l(n+1)>0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)>0且l(n+1)<0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)>0且l(n+1)>0时，令还原信号s(n)＝1、s(n+1)＝1。将各个时刻的s(n)、s(n+1)依次连接起来就得到了最终的还原信号比如输入解调器8的l(1)、l(1+1)可以得出s(1)、s(2)；输入l(3)、l(3+1)可以得出s(3)、s(4)……，将s(1)、s(2)、s(3)、s(4)……依次连接起来可以得到最后的还原信号
Figure GDA0003572752160000071
The receiving end is shown in Figure 1. At the receiving end, the receiver, the second delayer 6, the comparator 7, and the demodulator 8 are connected in sequence, and the receiver is also directly connected to the comparator 7, and the received modulator The modulated signal sent by 5 is divided into two channels, one is directly sent to the comparator 7, and the other is sent to the comparator 7 after being delayed by the second delayer 6. In the comparator 7, the undelayed signal 1 ( n) is divided by the signal l(n+1) delayed by the second delay device 6, and the absolute value is taken, and it is judged that it falls within the four ranges divided during encoding (ie (A, B) (B, C) )(C,D)(D,E)) which range when
Figure GDA0003572752160000061
When they belong to (A, B) (B, C) (C, D) (D, E) respectively, the corresponding demodulation circuits 1, 2, 3 and 4 are used respectively;
Figure GDA0003572752160000062
belong to the interval, the corresponding demodulation circuits 1, 2, 3, and 4 are used in sequence; the algorithm of demodulation circuit 1 is: when l(n)<0 and l(n+1)<0, let the restored signal s (n)=1, s(n+1)=0; when l(n)<0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)= 1; when l(n)>0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)>0 and l(n) When +1)>0, let the restored signal s(n)=0, s(n+1)=1; the algorithm of demodulation circuit 2 is: when l(n)<0 and l(n+1)<0 When , let the restored signal s(n)=1, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restored signal s(n)=1, s (n+1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=0, s(n+1)=1; when l(n) >0 and l(n+1)>0, let the restored signal s(n)=0, s(n+1)=0; the algorithm of demodulation circuit 3 is: when l(n)<0 and l( When n+1)<0, let the restored signal s(n)=0, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restored signal s( n)=0, s(n+1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=1, s(n+1)=1 ; When l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=0; the algorithm of demodulation circuit 4 is: when l(n) )<0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)<0 and l(n+1)>0 , let the restored signal s(n)=0, s(n+1)=1; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=1, s( n+1)=0; when l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=1. The final restored signal is obtained by connecting s(n) and s(n+1) at each moment in turn. For example, l(1) and l(1+1) of the input demodulator 8 can obtain s(1) , s(2); input l(3), l(3+1) to get s(3), s(4)..., s(1), s(2), s(3), s (4)...connect them in sequence to get the final restoration signal
Figure GDA0003572752160000071

为了更好地说明这个解调过程，附以下解调部分的程序：In order to better illustrate this demodulation process, the following demodulation part of the program is attached:

Figure GDA0003572752160000081
Figure GDA0003572752160000081

Figure GDA0003572752160000091
Figure GDA0003572752160000091

Figure GDA0003572752160000101
Figure GDA0003572752160000101

通过将调制后的信号比较后在不同范围分别使用不同的解调电路解调，可以在接收端不进行同步的条件下恢复出原始信号。如图3、图4可以看出，经过解调器解调出的还原信号与原始信号完全一致。By comparing the modulated signals and demodulating them with different demodulation circuits in different ranges, the original signal can be recovered without synchronization at the receiving end. As can be seen from Figure 3 and Figure 4, the restored signal demodulated by the demodulator is completely consistent with the original signal.

应当说明的是，以上所述仅是对本发明的优选实施例及原理进行了详细说明，对本领域的普通技术人员而言，依据本发明提供的思想，在具体实施方式上会有改变之处，而这些改变也应视为本发明的保护范围。It should be noted that the above only describes the preferred embodiments and principles of the present invention in detail. For those of ordinary skill in the art, according to the ideas provided by the present invention, there will be changes in the specific embodiments. And these changes should also be regarded as the protection scope of the present invention.

Claims (6)

1.一种非同步的保密通信系统，包括发送端和接收端，所述发送端和接收端间通信连接，其特征在于：1. a non-synchronized security communication system, comprising a transmitting end and a receiving end, the communication connection between the transmitting end and the receiving end, is characterized in that: 所述发送端设有第一电混沌信号发生装置、第二电混沌信号发生装置、第一延时器、编码器、调制器、信号处理器、原始信号输入端；所述第一电混沌信号发生装置、编码器依次连接；所述第二电混沌信号发生装置、第一延时器、编码器依次连接；所述编码器与调制器连接，所述原始信号输入端接受原始信号、与信号处理器连接，所述信号处理器与调制器连接，所述调制器与发送器连接；The sending end is provided with a first electrical chaotic signal generating device, a second electrical chaotic signal generating device, a first delayer, an encoder, a modulator, a signal processor, and an original signal input end; the first electrical chaotic signal The generating device and the encoder are connected in sequence; the second electrical chaotic signal generating device, the first delayer, and the encoder are connected in sequence; the encoder is connected with the modulator, and the original signal input terminal accepts the original signal and the signal the processor is connected, the signal processor is connected with the modulator, and the modulator is connected with the transmitter; 所述接收端设有接收端调制器、第二延时器、比较器、解调器，接收器、第二延时器、比较器、解调器依次连接，接收器还直接与比较器连接；发送器发送的信号会由接收器接收；The receiving end is provided with a receiving end modulator, a second delayer, a comparator, and a demodulator. The receiver, the second delayer, the comparator, and the demodulator are connected in sequence, and the receiver is also directly connected to the comparator. ; The signal sent by the transmitter will be received by the receiver; 所述编码器的四种编码方式分别为：设直接送至所述编码器的第一电混沌信号为x1(n)，经过延时器延时后送至编码器的第二电混沌信号为x2(n+1)，n表示一个离散的时刻，取
Figure FDA0003572752150000011
的最小值与最大值A、E，在A-E中依序选取三个区间值B、C、D，所述编码器根据各个时刻的
Figure FDA0003572752150000012
值所属于(A，B)(B，C)(C，D)(D，E)的区间对应地对信号进行编码，使编码后的信号x(n)、x(n+1)为x(n)＝-|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝-|x1(n)|、x(n+1)＝|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝-|x2(n+1)|；x(n)＝|x1(n)|、x(n+1)＝|x2(n+1)|；The four encoding modes of the encoder are respectively: set the first electrical chaotic signal directly sent to the encoder to be x 1 (n), and the second electrical chaotic signal sent to the encoder after being delayed by a delay device. is x 2 (n+1), n represents a discrete moment, take
Figure FDA0003572752150000011
The minimum and maximum values A, E of , select three interval values B, C, D in sequence in AE, and the encoder according to the
Figure FDA0003572752150000012
The interval where the value belongs to (A, B) (B, C) (C, D) (D, E) encodes the signal correspondingly, so that the encoded signals x(n) and x(n+1) are x (n)=-|x 1 (n)|, x(n+1)=-|x 2 (n+1)|; x(n)=-|x 1 (n)|, x(n+1 )=|x 2 (n+1)|; x(n)=|x 1 (n)|, x(n+1)=-|x 2 (n+1)|; x(n)=|x 1 (n)|, x(n+1)=|x 2 (n+1)|; 所述比较器的工作方式为，设接收器直接送至比较器的调制信号为l(n)、经第二延时器延时后送至比较器的延时调制信号为l(n+1)，n表示一个离散的时刻，取
Figure FDA0003572752150000013
的最小值与最大值A、E，在A-E中依序选取三个区间值B、C、D，比较各个时刻的
Figure FDA0003572752150000021
分别属于(A，B)(B，C)(C，D)(D，E)中的哪一个区间；The working mode of the comparator is as follows: the modulation signal directly sent by the receiver to the comparator is l(n), and the delay modulation signal sent to the comparator after being delayed by the second delayer is l(n+1. ), n represents a discrete moment, take
Figure FDA0003572752150000013
The minimum and maximum values A, E of , select three interval values B, C, D in sequence in AE, and compare the
Figure FDA0003572752150000021
Which interval in (A, B) (B, C) (C, D) (D, E) do they belong to; 所述解调器中设有四种解调电路，对应于比较器得出的
Figure FDA0003572752150000022
所属区间，依序分别使用解调电路1、2、3、4；解调电路1的算法为：当l(n)＜0且l(n+1)＜0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)＜0且l(n+1)＞0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)＞0且l(n+1)＜0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)＞0且l(n+1)＞0时，令还原信号s(n)＝0、s(n+1)＝1；解调电路2的算法为：当l(n)＜0且l(n+1)＜0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)＜0且l(n+1)＞0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)＞0且l(n+1)＜0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)＞0且l(n+1)＞0时，令还原信号s(n)＝0、s(n+1)＝0；解调电路3的算法为：当l(n)＜0且l(n+1)＜0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)＜0且l(n+1)＞0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)＞0且l(n+1)＜0时，令还原信号s(n)＝1、s(n+1)＝1；当l(n)＞0且l(n+1)＞0时，令还原信号s(n)＝1、s(n+1)＝0；解调电路4的算法为：当l(n)＜0且l(n+1)＜0时，令还原信号s(n)＝0、s(n+1)＝0；当l(n)＜0且l(n+1)＞0时，令还原信号s(n)＝0、s(n+1)＝1；当l(n)＞0且l(n+1)＜0时，令还原信号s(n)＝1、s(n+1)＝0；当l(n)＞0且l(n+1)＞0时，令还原信号s(n)＝1、s(n+1)＝1；将各个时刻的s(n)、s(n+1)依次连接得到最终的还原信号
Figure FDA0003572752150000023
There are four kinds of demodulation circuits in the demodulator, corresponding to the result obtained by the comparator.
Figure FDA0003572752150000022
In the interval, demodulation circuits 1, 2, 3, and 4 are used in sequence; the algorithm of demodulation circuit 1 is: when l(n)<0 and l(n+1)<0, let the restored signal s(n )=1, s(n+1)=0; when l(n)<0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=1; When l(n)>0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)>0 and l(n+1 )>0, let the restored signal s(n)=0, s(n+1)=1; the algorithm of demodulation circuit 2 is: when l(n)<0 and l(n+1)<0, Let the restored signal s(n)=1, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restored signal s(n)=1, s(n +1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=0, s(n+1)=1; when l(n)>0 And when l(n+1)>0, let the restored signal s(n)=0, s(n+1)=0; the algorithm of demodulation circuit 3 is: when l(n)<0 and l(n+ 1) When <0, let the restored signal s(n)=0, s(n+1)=1; when l(n)<0 and l(n+1)>0, let the restored signal s(n) =0, s(n+1)=0; when l(n)>0 and l(n+1)<0, let the restored signal s(n)=1, s(n+1)=1; when When l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=0; the algorithm of the demodulation circuit 4 is: when l(n)< When 0 and l(n+1)<0, let the restoration signal s(n)=0, s(n+1)=0; when l(n)<0 and l(n+1)>0, let Restore signal s(n)=0, s(n+1)=1; when l(n)>0 and l(n+1)<0, let restore signal s(n)=1, s(n+ 1)=0; when l(n)>0 and l(n+1)>0, let the restored signal s(n)=1, s(n+1)=1; , s(n+1) are connected in turn to obtain the final reduction signal
Figure FDA0003572752150000023
 2.如权利要求1所述的一种非同步的保密通信系统，其特征在于，所述第一电混沌信号发生装置包括依次连接的第一混沌激光器、第一光电转换器，第一光电转换器与编码器连接；所述第二电混沌信号发生装置包括相连接的第二混沌激光器、第二光电转换器，第二光电转换器与第一延时器连接。2. An asynchronous secure communication system according to claim 1, wherein the first electrical chaotic signal generating device comprises a first chaotic laser, a first photoelectric converter connected in sequence, and the first photoelectric conversion The encoder is connected with the encoder; the second electrical chaotic signal generating device includes a connected second chaotic laser and a second photoelectric converter, and the second photoelectric converter is connected with the first delay device. 3.如权利要求1所述的一种非同步的保密通信系统，其特征在于，所述编码器的工作方式为：根据直接送至所述编码器的第一电混沌信号和经过延时器延时后送至编码器的第二电混沌信号的比较结果选择四种不同的编码方式之一。3. a kind of asynchronous security communication system as claimed in claim 1 is characterized in that, the working mode of described encoder is: according to the first electric chaotic signal directly sent to described encoder and through delay device The comparison result of the second electrical chaotic signal sent to the encoder after the delay selects one of four different encoding modes. 4.如权利要求1所述的一种非同步的保密通信系统，其特征在于，所述信号处理器接收原始信号输入端发送的由“0”、“1”组成的原始信号，将其中的“0”变为“-1”，“1”依然保持为“1”。4. An asynchronous secure communication system according to claim 1, wherein the signal processor receives the original signal consisting of "0" and "1" sent by the original signal input terminal, and converts the "0" becomes "-1", "1" remains "1". 5.如权利要求3所述的一种非同步的保密通信系统，其特征在于，所述解调器中设有与所述编码器按四个区间编码相对应的四种解调电路。5 . The asynchronous secure communication system according to claim 3 , wherein the demodulator is provided with four kinds of demodulation circuits corresponding to the coding by the encoder in four intervals. 6 . 6.如权利要求2所述的一种非同步的保密通信系统，其特征在于，所述第一混沌激光器的延迟为2.67ns，所述第二混沌激光器的延迟为1.50ns；所述第一混沌激光器的阈值电流为32mA，所述第二混沌激光器的阈值电流为14.7mA；所述第一混沌激光器的透明载流子数为1.6633×108，所述第二混沌激光器的透明载流子数为1.5000×108；所述第一混沌激光器及所述第二混沌激光器的工作波长为1550nm。6. An asynchronous secure communication system according to claim 2, wherein the delay of the first chaotic laser is 2.67ns, and the delay of the second chaotic laser is 1.50ns; The threshold current of the chaotic laser is 32mA, and the threshold current of the second chaotic laser is 14.7mA; the number of transparent carriers of the first chaotic laser is 1.6633×10 8 , and the transparent carriers of the second chaotic laser are 1.6633×10 8 . The number is 1.5000×10 8 ; the operating wavelength of the first chaotic laser and the second chaotic laser is 1550 nm.
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