CN110474717A - A kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication - Google Patents
A kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication Download PDFInfo
- Publication number
- CN110474717A CN110474717A CN201910788861.3A CN201910788861A CN110474717A CN 110474717 A CN110474717 A CN 110474717A CN 201910788861 A CN201910788861 A CN 201910788861A CN 110474717 A CN110474717 A CN 110474717A
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- Prior art keywords
- safety
- carrier wave
- physical layer
- electric power
- digital signal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/16—Implementing security features at a particular protocol layer
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Computer Security & Cryptography (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a kind of safety of physical layer technologies for ubiquitous electric power Internet of Things Network Communication, including transmitter and receiver: transmitter includes convolution coder, DBPSK modulator, OFDM modulator, digital front-end；Receiver includes digital front-end, ofdm demodulator, DBPSK demodulator, Viterbi decoder, itself the following steps are included: (1) by original information bits stream by convolution coder, DBPSK modulator, OFDM modulator, digital front-end, form carrier wave digital signal all the way；(2) false sequence is formed into the continuous carrier wave digital signal of multichannel by transmitter；(3) above-mentioned all carrier wave digital signals are merged into continuous carrier wave digital signal all the way；(4) receiver is recovered raw information using bandwidth identical with transmitter, frequency point configuration；The present invention is by merging into continuous carrier wave digital signal all the way for the carrier wave digital signal of multichannel different center frequency, different bandwidth, so that by hiding centre frequency, bandwidth information realizes secure communication.
Description
Technical field
The invention belongs to support the power line carrier communication field of Internet of Things, and in particular to one kind is used for ubiquitous electric power Internet of Things
The safety of physical layer technology of Network Communication.
Background technique
The information leakage of power line communication network no matter in smart grid or domestic applications, for privacy and safety all
It is a threat.Traditional power line communication is safely using the method for encryption, to prevent listener-in from obtaining the data in network.In
Transmitting terminal is encrypted by data key；It is decrypted in receiving end, then with data key.Although this method can
So that listener-in is difficult to get the effective information in data, but redundancy, time delay can be led to the problem of, the requirement to security performance
Higher, corresponding cost is also bigger.Safety of physical layer technology proposed by the present invention for power line communication, considerably increases surreptitiously
Taker cracks required calculation amount, enhances the safety of power line communication.
Summary of the invention
The purpose of the present invention is to provide a kind of safety of physical layer technologies for ubiquitous electric power Internet of Things Network Communication, to solve
The problems mentioned above in the background art.
Present invention provide the technical scheme that a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication,
In include transmitter and receiver；Transmitter includes convolution coder, DBPSK modulator, OFDM modulator, digital front-end；
Receiver includes digital front-end, OFDM demodulator, DBPSK demodulator, Viterbi decoder.
In transmitting terminal, data bit flow passes sequentially through convolution coder, DBPSK modulator, is then modulated by OFDM
Device forms data frame, and data pass through IFFT by frequency-domain transform to time domain in the process；It is re-fed into transmitter number later
Front end, data change signal bandwidth and frequency point in digital front-end, are finally sent to transmit in channel；In receiving end, receiver
Digital front-end is demodulated using known bandwidth and frequency point information, passes sequentially through OFDM demodulator, DBPSK demodulation later
Device and Viterbi decoder finally obtain original data bits stream.
In order to improve communication security, we propose a kind of safe practice from the angle of physical layer.The technology passes through pending
The number of delivering letters the right and left addition interference signal, realization bandwidth and frequency point information are obscured, to improve communication security.
The interference signal of addition can also be different bandwidth with original signal same band.Concrete implementation scheme has four
Kind.The first scheme generates the false number with original information bits equal length by random generator before transmitter
According to then also passing sequentially through the modules of transmitter；Unlike, in digital front-end, change the position of center frequency point, with
It add it just can in raw information two sides, so that bandwidth and frequency point information be stashed；Certainly, add in spurious signal
It before being added in original signal both ends, needs that it is normalized in time domain, so that they seem as far as possible in time domain
There is no significant difference.The shortcomings that this mode is exactly that each spurious signal requires the whole flow process by transmitter, therefore imitates
Rate can reduce.In order to overcome this disadvantage, second scheme is proposed.
Second scheme is copied into several parts, is then successively led to after original data bits stream is modulated by OFDM
It crosses digital front-end and obtains same band, the signal of different center frequency points；Their center frequency point is arranged by digital front-end, so that
They can synthesize a new continuous signal.The bandwidth and frequency point information of original signal are thus hidden.But due to
The practical original signal for being in different center frequency points of spurious signal, then which, which is equivalent to, directly replicates original signal
It is added to its two sides, reduces safety in fact in this way.In order to overcome this disadvantage, for adding the signal in two sides, we
Noise is artificially added to them, to be different from original signal.
The third scheme further changes the bandwidth of spurious signal by digital front-end on the basis of the first scheme,
To obtain the digital carrier signal of multichannel different bandwidth, different frequent points, finally remerge as continuous digital carrier letter all the way
Number.
4th kind of scheme further changes the bandwidth of spurious signal by digital front-end on the basis of second scheme,
To obtain the digital carrier signal of multichannel different bandwidth, different frequent points, finally remerge as continuous digital carrier letter all the way
Number.
Scheme three, four is after synthesizing digital carrier signal all the way, it is also necessary to its time domain, frequency domain handled, so that
It obtains and preferably hides bandwidth, frequency point information.
Compared with prior art, the beneficial effects of the present invention are:
The present invention generates the carrier wave digital signal of multichannel different frequent points, different bandwidth, multichannel carrier number letter by spurious signal
Number continuous carrier wave digital signal all the way is synthesized again, to hide frequency point, bandwidth information, realize secure communication.
Detailed description of the invention
Fig. 1 is the flow chart of embodiment one provided by the invention；
Fig. 2 is the flow chart of embodiment two provided by the invention；
Fig. 3 is the flow chart of embodiment three provided by the invention；
Fig. 4 is the flow chart of example IV provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, the described embodiment is only a part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Fig. 1, Fig. 2, Fig. 3, Fig. 4 are please referred to, the present invention provides a kind of technical solution: one kind is for ubiquitous electric power Internet of Things
The safety of physical layer technology of Network Communication, including transmitter and receiver；Transmitter includes convolution coder, DBPSK modulation
Device, OFDM modulator, digital front-end；Receiver includes digital front-end, OFDM demodulator, DBPSK demodulator, Viterbi solution
Code device.
The implementation steps of embodiment one are as follows:
(1) by original information bits stream pass sequentially through convolution coder, DBPSK modulator, OFDM modulator, digital front-end,
Normalization forms the carrier wave digital signal of bandwidth 40MHz, center frequency point 200MHz all the way；
(2) will spurious signal 1 identical with original information bits stream length, pass sequentially through convolution coder, DBPSK modulation
Device, OFDM modulator, digital front-end, normalization form the carrier wave number of bandwidth 40MHz, center frequency point 160MHz all the way
Signal；
(3) will spurious signal 2 identical with original information bits stream length, pass sequentially through convolution coder, DBPSK modulation
Device, OFDM modulator, digital front-end, normalization form the carrier wave number of bandwidth 40MHz, center frequency point 120MHz all the way
Signal；
(4) the above three-channel carrier digital signal is integrated, forms bandwidth 120MHz all the way, the carrier wave of center frequency point 160MHz
Digital signal.
The implementation steps of embodiment two are as follows:
(1) original information bits stream is passed sequentially through into convolution coder, DBPSK modulator, OFDM modulator, OFDM modulation
The output of device is divided into 3 tunnels；
(2) noise is added to the first via, then by digital front-end, normalization, forms bandwidth 40MHz, center frequency point all the way
The carrier wave digital signal of 120MHz；
(3) noise is added to the second tunnel, then by digital front-end, normalization, forms bandwidth 40MHz, center frequency point all the way
The carrier wave digital signal of 160MHz；
(4) third road directly passes through digital front-end, normalization, forms the load of bandwidth 40MHz, center frequency point 200MHz all the way
Wave digital signal；
(5) the above three-channel carrier digital signal is integrated, forms bandwidth 120MHz all the way, the carrier wave of center frequency point 160MHz
Digital signal.
The implementation steps of embodiment three are as follows:
(1) by original information bits stream pass sequentially through convolution coder, DBPSK modulator, OFDM modulator, digital front-end,
Normalization forms the carrier wave digital signal of bandwidth 40MHz, center frequency point 200MHz all the way；
(2) will spurious signal 1 identical with original information bits stream length, pass sequentially through convolution coder, DBPSK modulation
Device, OFDM modulator, digital front-end, normalization form the carrier wave number of bandwidth 20MHz, center frequency point 170MHz all the way
Signal；
(3) will spurious signal 2 identical with original information bits stream length, pass sequentially through convolution coder, DBPSK modulation
Device, OFDM modulator, digital front-end, normalization form the carrier wave number of bandwidth 10MHz, center frequency point 155MHz all the way
Signal；
(4) the above three-channel carrier digital signal is integrated, forms bandwidth 70MHz all the way, the carrier number of center frequency point 185MHz
Word signal.
The implementation steps of example IV are as follows:
(1) original information bits stream is passed sequentially through into convolution coder, DBPSK modulator, OFDM modulator, OFDM modulation
The output of device is divided into 3 tunnels；
(2) noise is added to the first via, then by digital front-end, normalization, forms bandwidth 20MHz, center frequency point all the way
The carrier wave digital signal of 170MHz；
(3) noise is added to the second tunnel, then by digital front-end, normalization, forms bandwidth 10MHz, center frequency point all the way
The carrier wave digital signal of 155MHz；
(4) third road directly passes through digital front-end, normalization, forms the load of bandwidth 40MHz, center frequency point 200MHz all the way
Wave digital signal；
(5) the above three-channel carrier digital signal is integrated, forms bandwidth 70MHz all the way, the carrier number of center frequency point 185MHz
Word signal.
In above-mentioned each scheme, for per all the way, using different digital front-ends, to obtain different bandwidth, different centers
The carrier wave digital signal of frequency point；After multichannel carrier digital signal merges and becomes continuous carrier wave digital signal all the way, original tape is wide
Hidden with center frequency point information, it is only legal, it is known that bandwidth, center frequency point information user could accurately will receive
Signal, which demodulates, to be come.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand without departing from the principles and spirit of the present invention can to these embodiments carry out it is a variety of variation, modification replacement and
Modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication, including transmitter and receiver: sending
Machine includes convolution coder, DBPSK modulator, OFDM modulator, digital front-end；Receiver includes digital front-end, OFDM solution
Adjust device, DBPSK demodulator, Viterbi decoder；It is characterized in that, the technology the following steps are included:
(1) original information bits stream is formed by convolution coder, DBPSK modulator, OFDM modulator, digital front-end
Carrier wave digital signal all the way；
False sequence is formed into the continuous carrier wave digital signal of multichannel by transmitter；
Above-mentioned all carrier wave digital signals are merged into continuous carrier wave digital signal all the way；
(4) receiver is recovered raw information using bandwidth identical with transmitter, frequency point configuration.
2. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication according to claim 1, feature
Be: spurious signal forms the multichannel carrier digital signal of equiband by digital front-end, and before multichannel synthesizes all the way, needs
It to be normalized in time domain.
3. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication according to claim 1, feature
Be: spurious signal is generated by random generator, and complete transmitter chain is passed through as original information bits stream.
4. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication according to claim 1, feature
Be: spurious signal only needs the digital front-end part by transmitter by generating to information sequence plus noise at this time.
5. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication according to claim 1, feature
Be: spurious signal forms the multichannel carrier digital signal of different-bandwidth by digital front-end, further hides bandwidth information.
6. a kind of safety of physical layer for ubiquitous electric power Internet of Things Network Communication described in -5 any one according to claim 1
Technology, it is characterised in that: after obtaining multichannel carrier digital signal, time domain length processing is carried out to it.
7. a kind of safety of physical layer for ubiquitous electric power Internet of Things Network Communication described in -5 any one according to claim 1
Technology, it is characterised in that: after obtaining multichannel carrier digital signal, frequency domain normalized is carried out to it.
8. a kind of safety of physical layer technology for ubiquitous electric power Internet of Things Network Communication according to claim 1, feature
Be: digital band-pass signal is converted to equivalent complex base band signal by digital receiver front end.
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Cited By (3)
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| CN111224690A (en) * | 2020-02-28 | 2020-06-02 | 上海交通大学 | Ubiquitous power Internet of things communication system based on MIMO |
| CN112152671A (en) * | 2020-10-29 | 2020-12-29 | 国网江西省电力有限公司经济技术研究院 | MIMO power line carrier communication method and system |
| CN113794490A (en) * | 2021-08-12 | 2021-12-14 | 广西电网有限责任公司南宁供电局 | Power line carrier communication system and method for power protection command |
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Application publication date: 20191119 |