CN107360479B - Encryption method for multiple access passive optical network - Google Patents
Encryption method for multiple access passive optical network Download PDFInfo
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- CN107360479B CN107360479B CN201710579451.9A CN201710579451A CN107360479B CN 107360479 B CN107360479 B CN 107360479B CN 201710579451 A CN201710579451 A CN 201710579451A CN 107360479 B CN107360479 B CN 107360479B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—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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- 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
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Abstract
The invention relates to an encryption method of a multiple access passive optical network, which solves the technical problem of low safety, and determines which filter pairs are specifically used by different optical network units by adopting a software defined network controller to dynamically allocate digital filter pairs according to the bandwidth requirements of the optical network units and informing a transmitting end and a receiving end. The digital filter introduces a phase which changes dynamically and constantly during the filtering process. The invention utilizes the chaotic system to generate the phase sequence of the digital filter, and the digital filters with different center frequencies have different phase sequences. In addition, the software-defined network controller needs to inform the transmitting end and the receiving end of the chaotic system for generating the phase sequence of the digital filter and the parameter setting thereof, and the technical scheme that the receiving end can correctly match the filtering by ensuring the data interval length when the phase changes during the shaping filtering and the matched filtering solves the problem, and the software-defined network controller is used in the multiple access passive optical network.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an encryption method for a multiple access passive optical network.
Background
In recent years, a new digital access technology (DFMA) with SDN control has been proposed. As a new access technology evolved from digital filtering, the DFMA access technology not only enables a communication system to have the advantages of a carrier-less amplitude/phase modulation (CAP) communication system, but also enables a network to have higher flexibility of bandwidth resource allocation. DFMA has great potential to support future cloud access networks, and can seamlessly integrate traditional access networks, metropolitan area optical networks and mobile front-haul/back-haul networks. In addition to the advantages mentioned above, DFMA has other significant advantages: SDN solutions that fully support network control further to the physical layer; the method has good compatibility with the existing network; transparent to the transmission technology and network topology. In 2015, the university of banger in england proposed a digital filter multiple access-passive optical network (DFMA-PON), and detailed research was performed on multi-user uplink communication. In the DFMA-PON, the SDN controller may control encoding, decoding, upsampling, downsampling, and digital filtering and matched filtering of signals at a transmitting end and a receiving end through the DSP controller.
According to the inventor's knowledge, there is no research on the security problem of the DFMA-PON at present, and the DFMA-PON is suitable for the security-compliant Optical ofdm channel Multiplexing for Software-configurable Optical networks ("Journal of L sight Technology 32.6(2014):1200-1206] and the DFMA-compliant Optical network filters (" rf-compliant Optical networks "," c.audio-monitor ", and j.m. Tang", "Digital Filter access networks", "dsp-enhanced Optical network configuration", "etc.: 2015", etc. so that the DFMA-PON can be matched with other security-compliant Optical networks ("DFMA-PON", so that the DFMA-PON can be matched with other security-compliant Optical networks ("ONU-PON"), once the DFMA-PON is found, the DFMA-PON is suitable for the security-compliant Optical network filters ("rf-compliant ONU-PON", the DFMA-PON transmits the information to the DFMA-PON sharing Filter, and the DFMA-PON sharing information can be matched with other security-compliant ONU 222, so that the DFMA-PON can be matched with other security-compliant Optical networks ("ONU-compliant Optical networks" ("ONU-PON", so that the DFMA-PON can be matched with other security-compliant Optical networks ("ONU-compliant Optical networks". the DFMA-PON, so that the DFMA-PON can be matched with other security-compliant Optical networks ("ONU-compliant Optical networks". the DFMA-compliant Optical networks.
Disclosure of Invention
The invention aims to solve the technical problem that the safety of the conventional digital filter multi-access passive optical network is low. The encryption method for the multiple access passive optical network has the characteristics of high safety, low cost and wide application.
In order to solve the technical problems, the technical scheme is as follows:
an encryption method for a multiple access passive optical network, the encryption method comprising:
(1) the method comprises the steps that a software-defined network controller defines a shaping filtering scheme of a transmitting end, wherein the shaping filtering scheme comprises the number x of shaping digital filter pairs, a state function f (i), i is 1.2.3.. x, a shaping digital filter phase-time function and the use conditions of different channel shaping filter pairs of the transmitting end, the transmitting end informs a receiving end of the shaping filtering scheme, and the receiving end generates a corresponding matched filtering scheme according to the shaping filtering scheme of the transmitting end;
(2) the transmitting end comprises at least one channel, each channel outputs data to be transmitted, the data to be transmitted are sequentially subjected to coding modulation and M times of upsampling, the number n of the reshaping digital filter pairs in an on state is obtained by each channel according to the corresponding reshaping filtering scheme in the step (1), the M times of upsampled data are subjected to serial-parallel conversion to obtain 2n lines of parallel data, and each line of the parallel data is subjected to reshaping filtering by using one reshaping digital filter to obtain the parallel data;
(3) merging the parallel data of each channel, merging the digital domain signals of all the channels, then carrying out digital-to-analog conversion and intensity modulation to obtain optical signals, and sending the optical signals to a receiving end;
(4) defining the number of optical network units at the receiving end to be consistent with the number of channels at the transmitting end, performing analog-to-digital conversion after each optical network unit at the receiving end converts an optical signal into an electric signal, obtaining the number 2n of matched filters in an open state as a branching number according to the corresponding matched filtering scheme in the step (1), and branching the analog-to-digital conversion data into 2n paths; each optical network unit performs matched filtering on the data after being shunted through a matched digital filter according to the matched filtering scheme in the step (1); carrying out parallel-serial conversion, M-time down-sampling and de-coding modulation on the matched and filtered data to obtain real received data;
the shaping digital filter pair and the matched digital filter pair respectively comprise two digital filters with the same center frequency, an in-phase filter and a quadrature-phase filter.
The working principle of the invention is as follows: in the process of filtering each channel of the transmitting end, all filters introduce phases, the phase sequences of different filter pairs are different, the phases of all filters are dynamically changed during filtering, and each optical network unit of the receiving end only knows the corresponding matched filtering scheme of the optical network unit until the filtering is finished, namely the adopted matched digital filter pair and the corresponding matched digital filter phase sequence, so that the matched filtering can be correctly carried out, and the encryption and decryption process with high safety is finally finished.
Further, in the shaping filtering scheme and the corresponding matched filtering scheme, the center frequencies of the shaping filter pair and the matched filter pair are the same.
Further, the shaping digital filter phase-time function comprises that all digital filters in a transmitting end channel define initial phases, a chaotic system is used for generating a phase sequence of the digital filters, and the digital filter phases are updated every L data lengths during shaping filtering.
Further, the chaotic systems in the shaping filtering schemes and the matched filtering schemes are the same chaotic system, and the chaotic system substitutes the initial phase parameters into the chaotic system for iteration to obtain a phase sequence.
Further, the quadrature-phase digital filter pairs are each constructed of a Hilbert quadrature pair.
Further, the shaping filtering schemes corresponding to each channel of the transmitting end are different, and correspondingly, the matching filtering schemes corresponding to each optical network unit of the receiving end are different.
Further, the phase sequence of the shaping filter pair of each channel in the transmitting end is identical to the phase sequence of the matched filter pair in the corresponding optical network unit of the receiving end.
Further, the phase sequences of any pair of the quadrature-phase digital filters, the in-phase filter and the quadrature-phase filter are identical, and the phases of the filters are kept synchronously changed during the shaping filtering or the matched filtering.
Further, the M is not less than the number of digital filters with the transmitting end in an on state.
Further, the coded modulation is QAM modulation or OFDM modulation or PAM modulation.
Further, the encryption method is located in a digital signal processing system.
The invention relates to an encryption method for a digital filter multiple access passive optical network.A software defined network controller dynamically allocates filter pairs according to the bandwidth requirements of each optical network unit, if the bandwidth requirements of a certain optical network unit are larger, a plurality of pairs of filters can be allocated to the optical network unit, and if the bandwidth requirements of the optical network unit are not larger, only one pair of filters can be allocated to the optical network unit. All filters at the transmitting end introduce phases, the phase sequences of all filters are generated through a chaotic system, the phase sequences of filter pairs with different frequencies in the center are different, and the phases of all filters dynamically change after filtering data with a certain length in the filtering process. At the receiving end, if each optical network unit does not know which matched filter pairs and the phase sequences of the matched filter pairs should be used, the optical network units cannot realize correct matched filtering, and cannot correctly demodulate data information, so that communication encryption is realized. Only when each optical network unit at the receiving end knows which matched filter pairs should be used and the phase sequences of the matched filter pairs, matched filtering can be correctly performed, and then data information can be correctly demodulated.
The invention has the following beneficial effects:
first, the invention is not only suitable for DFMA-PON based on OFDM modulation, but also suitable for DFMA-PON based on QAM modulation, and also suitable for DFMA-PON based on PAM modulation.
The encryption process of the transmitting end and the decryption process of the receiving end are both carried out in the digital signal processing, so the system hardware cost is lower.
And thirdly, all the filters introduce phases, but the orthogonal relation among the filters is not destroyed, and meanwhile, the whole system has high confidentiality.
The invention can enhance the security degree of the system by changing the number of the filters, the more the number of the filters of the whole system is, the more the number of the filter pairs distributed to each optical network unit is, and the more the phases are introduced into all the filters, and the more the phases are dynamically changed in the filtering process, the higher the confidentiality of the whole communication system is.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a structural diagram of a specific implementation of an encryption method for a digital filter multiple access passive optical network in embodiment 1;
fig. 2 is a schematic diagram of a digital filter multiple access passive optical network encryption method in embodiment 1, in which a pair of digital filters is used for shaping and filtering one channel at the transmitting end;
fig. 3 is a schematic diagram of performing matched filtering by using a pair of digital filters in one optical network unit at a receiving end in the encryption method for a digital filter multiple access passive optical network in embodiment 1;
fig. 4 is a schematic diagram illustrating the usage of shaping filters of all channels at the transmitting end and the phase change of the filters during filtering in the encryption method for the digital filter multiple access passive optical network in embodiment 1;
fig. 5 is a schematic diagram of the usage of the matched filters of all optical network units at the receiving end in the encryption method for the digital filter multiple access passive optical network according to embodiment 1 and the phase change of the filters during the matched filtering process.
Fig. 6 is a test curve of the phase tolerance of the digital filter in the encryption method of the digital filter multiple access passive optical network according to the present invention.
Fig. 7 is a graph showing BER of four legal optical network user units (ONUs) and an illegal ONU according to the encryption method for the digital filter multiple access passive optical network of the present invention, as a function of received optical power.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
For convenience of description, the related terms appearing in the detailed description are explained:
fig. 1 is a block diagram of an embodiment of an encryption method for a digital filter multiple access passive optical network according to the present invention. The digital filter multiple access passive optical network comprises an optical line terminal and a plurality of optical network units.
The embodiment provides an encryption method for a multiple access passive optical network, which includes:
(1) the method comprises the steps that a software-defined network controller defines a shaping filtering scheme of a transmitting end, wherein the shaping filtering scheme comprises the number x of shaping digital filter teams, a state function f (i), i is 1.2.3.. x, a shaping digital filter phase-time function and the use condition of shaping filters of the transmitting end of different channels of the transmitting end, the shaping filtering scheme is informed to a receiving end, and the receiving end generates a corresponding matched filtering scheme according to the shaping filtering scheme of the transmitting end;
the method specifically comprises the following steps: the software-defined network controller dynamically allocates the digital filter pairs according to the bandwidth requirements of the optical network units, and informs the transmitting end and the receiving end of the use conditions of the digital filter pairs of different optical network units, namely determines which filter pairs are specifically used by different optical network units. In addition, the software-defined network controller also needs to inform the transmitting end and the receiving end of a chaotic system for generating the phase of the digital filter and the parameter setting thereof, and the data interval length when the phase changes during filtering and matched filtering, so as to ensure that the receiving end can correctly match filtering.
(2) The transmitting end comprises at least one channel, each channel outputs data to be transmitted, the data to be transmitted are sequentially subjected to coding modulation and M times of upsampling, the number n of the reshaping digital filter pairs in an on state is obtained by each channel according to the corresponding reshaping filtering scheme in the step (1), the M times of upsampled data are subjected to serial-parallel conversion to obtain 2n lines of parallel data, and each line of the parallel data is subjected to reshaping filtering by using a reshaping digital filter combination to obtain the parallel data;
(3) merging the parallel data of each channel, merging the digital domain signals of all the channels, then carrying out digital-to-analog conversion and intensity modulation to obtain optical signals, and sending the optical signals to a receiving end; in the process of converting the electric signal into the optical signal, a Mach-Zehnder modulator is adopted for intensity modulation in the example, and the laser generates laser and then enters the Mach-Zehnder modulator as a modulation light source; sending the modulated optical signal to an optical fiber channel for transmission;
(4) defining the number of optical network units at a receiving end to be consistent with the number of channels at a transmitting end, converting optical signals into electric signals at the receiving end, performing analog-to-digital conversion, obtaining the number x of matched filter pairs in an on state by each optical network unit according to the corresponding matched filtering scheme in the step (1), and shunting analog-to-digital conversion data into 2x paths; each optical network unit performs matched filtering on the data after being shunted through a matched digital filter according to the matched filtering scheme in the step (1); carrying out parallel-serial conversion, M-time down-sampling and de-coding modulation on the matched and filtered data to obtain real received data;
fig. 2 is a schematic diagram of a digital filter multiple access passive optical network encryption method according to the present invention, in which a pair of digital filters are used for shaping and filtering one of the channels at the transmitting end, as shown in fig. 2, two quadrature-phase digital filters with the same center frequency are used for shaping and filtering the channel, one of the filters is an in-phase filter and the other is a quadrature-phase filter, a chaotic system is used to generate phase sequences of the two digital filters, the phase sequences of the two digital filters are identical so that they can satisfy a quadrature relationship when introducing phases, and when the two digital filters shape and filter two parallel data, their respective phases are updated at the same time every L data, and other parameters of the digital filters are not changed until the shaping and filtering are finished.
As shown in FIG. 3, the two matched filters in the ONU perform matched filtering by using two quadrature-phase digital filters with the same center frequency, wherein one filter is an in-phase filter, and the other filter is a quadrature-phase filter, the phase sequences of the two matched filters are completely consistent with the phase sequence of the shaping filter in the corresponding channel at the transmitting end, and the center frequencies of the two matched filters are the same as the center frequency of the shaping filter in the corresponding channel at the transmitting end.
Fig. 4 is a schematic diagram of the usage of shaping filters for all channels of the transmitting end in the encryption method of the digital filter multiple access passive optical network according to the present invention and the phase change of the filters during the filtering process. As shown in figure 4 of the drawings,
representing a central frequency of fciWhen the phase is the same as
Representing a central frequency of fciWhen the phase is the same as
The phase of the in-phase and quadrature shaping filters during the entire filtering process
Constantly changing simultaneously and always the same. Of course, different filtering schemes may be used according to actual needs, the filter pairs used by the optical network units in different filtering schemes are different, the software-defined network controller may dynamically allocate the filters according to the bandwidth requirements of the optical network units, and if the bandwidth requirements of a certain optical network unit are large, the software-defined network controller may allocate a plurality of pairs of filters to the optical network unit. Meanwhile, in order to enhance the safety of the whole system, when the filtering scheme is changed, a series of initial values are distributed to the chaotic system again, so that a new phase sequence can be obtained for each filter pair.
Fig. 5 is a diagram illustrating an embodiment of the usage of the matched filters of all optical network units at the receiving end and the phase change of the filter during the matched filtering process in the encryption method for the digital filter multiple access passive optical network according to the present invention. As shown in FIG. 5, the matched filter
Representing a central frequency of fciWhen the phase is the same as that of the in-phase matched digital filter
Matched filter
Representing a central frequency of fciWhen the phase is the same as
The phase of the in-phase and quadrature matched filters during the whole matched filtering process
Constantly changing simultaneously and always the same.
We use MAT L AB for testing, the optical fiber transmission distance is 0km, we use two pairs of quadrature phase digital filters in the test, we can find all filters have similar phase tolerance curve from FIG. 6, at the same time, we can also find all filters have phase tolerance around 0.22 radian from FIG. 6, i.e. we need to make the deviation of the actual phase from the ideal phase of the matched filter less than 0.22 radian when the receiving end Bit Error Rate (BER) meets the Forward Error Correction (FEC) line when the matched filtering is performed.
Fig. 7 is a graph showing BER of four legal optical network user units (ONUs) and an illegal ONU according to the encryption method for a digital filter multiple access passive optical network of the present invention as a function of received optical power. The optical simulation software VPI is used for simulation test, and the optical fiber transmission distance is 25 km. From fig. 7, it can be found that BER-received optical power curves of four legal ONUs are approximately coincident, and they can reach the FEC line when the received optical power is about-18.5 dB, while the BER of an illegal ONU is always about-0.5, that is, the illegal ONU cannot correctly demodulate the data at the transmitting end, so that secret communication can be realized.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (9)
1. An encryption method for a multiple access passive optical network, characterized in that: the encryption method comprises the following steps:
(1) the software-defined network controller defines a shaping filtering scheme of a transmitting end, and the shaping filtering scheme comprises the number x of shaping digital filter pairs, a state function f (i), and 1.2.3.. x, wherein all the shaping digital filters are used for generating a chaotic system and parameter setting of a phase sequence, the data interval length L when the phase of the digital filters is changed during shaping filtering and matched filtering, and the using conditions of the shaping filter pairs of different channels of the transmitting end, the transmitting end informs the shaping filtering scheme to a receiving end, and the receiving end generates a corresponding matched filtering scheme according to the shaping filtering scheme of the transmitting end;
(2) the transmitting end at least comprises one channel, each channel outputs data to be transmitted, the data to be transmitted are sequentially subjected to coding modulation and M times of upsampling, each channel obtains shaping digital filter pairs which are used in an on state and the number n of the shaping digital filter pairs according to a corresponding shaping filtering scheme in the step (1), a chaotic system is utilized to generate phase sequences of the filter pairs, the M times of upsampled data are subjected to serial-parallel conversion to obtain 2n rows of parallel data, each row of the parallel data uses one shaping digital filter to perform shaping filtering, and the phases of all the digital filters are updated every data length L during shaping filtering until the filtering is completed to obtain the parallel data;
(3) merging the parallel data of each channel, merging the digital domain signals of all the channels, then carrying out digital-to-analog conversion and intensity modulation to obtain optical signals, and sending the optical signals to a receiving end;
(4) defining the number of optical network units at a receiving end to be consistent with the number of channels at a transmitting end, converting an optical signal into an electric signal by each optical network unit at the receiving end, performing analog-digital conversion, obtaining matched filter pairs which are used in an open state and the number n of the matched filter pairs according to a corresponding matched filtering scheme in the step (1), generating phase sequences of the filter pairs by using a chaotic system, splitting analog-digital conversion data into 2n paths, performing matched filtering on the split data by using a matched digital filter, updating the phases of all matched filters at intervals of data length L during matched filtering, and performing parallel-serial conversion, M-time down sampling and de-coding modulation on the matched filtered data to obtain real received data;
the shaping digital filter pair and the matched digital filter pair each include an in-phase digital filter and a quadrature-phase digital filter having the same center frequency.
2. The encryption method of the multiple access passive optical network of claim 1, wherein: the shaping filter scheme is the same as the corresponding matched filter scheme, and the center frequency of the digital filter corresponding to the shaping filter pair and the matched filter pair is the same.
3. The encryption method of the multiple access passive optical network of claim 1, wherein:
all digital filters in the transmitting end channel define initial phases, a chaos system is used for generating phase sequences of the digital filters, and the phases of the digital filters are updated every data length L during shaping filtering.
4. The encryption method of the multiple access passive optical network of claim 3, wherein:
the chaotic systems in the shaping filtering schemes and the matched filtering schemes are the same chaotic system, and the chaotic system substitutes initial phase parameters into the chaotic system to carry out iteration to obtain a phase sequence.
5. The encryption method of the multiple access passive optical network of claim 1, wherein: the quadrature-phase digital filter pairs are each constructed from Hilbert quadrature pairs.
6. The encryption method of the multiple access passive optical network of claim 1, wherein: the shaping filtering schemes corresponding to each channel of the transmitting end are different, and correspondingly, the matching filtering schemes corresponding to each optical network unit of the receiving end are different.
7. The encryption method of the multiple access passive optical network of claim 1, wherein: the phase sequence of the shaping filter pair of each channel in the transmitting end is completely the same as the phase sequence of the matched filter pair in the corresponding optical network unit of the receiving end.
8. The encryption method of the multiple access passive optical network of claim 1, wherein: m in the M times is not less than the number of the digital filters with the transmitting end in an on state.
9. The encryption method of the multiple access passive optical network of claim 1, wherein: the code modulation is QAM modulation or OFDM modulation or PAM modulation, and the encryption method is located in a digital signal processing system.
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| CN108199780B (en) * | 2017-12-25 | 2020-01-21 | 中科稀土（长春）有限责任公司 | Encryption method and encryption system for optical information |
| CN108399141B (en) * | 2018-02-08 | 2021-01-05 | 北京临近空间飞行器系统工程研究所 | Data-driven space-based communication system enabling method |
| CN109039612B (en) * | 2018-09-11 | 2021-03-12 | 北京智芯微电子科技有限公司 | Secure interaction method and system for software defined optical network |
| CN109327478B (en) * | 2018-12-11 | 2020-11-20 | 电子科技大学 | Chaotic physical layer secret access method |
| CN111447054B (en) * | 2020-05-28 | 2021-05-14 | 北京邮电大学 | FBMC passive optical network physical layer encryption method and device based on five-dimensional hyperchaos |
| CN114900401A (en) * | 2022-03-24 | 2022-08-12 | 重庆邮电大学 | DFMA-PONs-oriented channel interference elimination method and device |
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