CN110365447A - A kind of encryption safe transmission method of eating dishes without rice or wine based on NI USRP-RIO - Google Patents
A kind of encryption safe transmission method of eating dishes without rice or wine based on NI USRP-RIO Download PDFInfo
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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
- H04L1/004—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a kind of encryption safe transmission method of eating dishes without rice or wine based on NI USRP-RIO, specifically includes the following steps: 1) relay node R, user terminal A and user terminal B carry out time synchronization；2) user terminal A and user terminal B alternately send channel estimation frame to relay node R first, and relay node R estimates channel h after receiving the channel estimation frame from user terminal A and user terminal B firstARWith channel hBR, then to channel hARAnd hBRAmplitude and angle quantified and encoded respectively, pilot tone is then inserted into before coding result and is broadcast to user terminal A and user terminal B, user terminal A and user terminal B estimate channel h after receiving the signal of relay node R transmission respectivelyRAAnd channel hRB, channel information h is then obtained by relevant detectionARAnd hBR；3) user terminal A and user terminal B complete two-way information interaction under the auxiliary of relay node R, and this method can be realized the safe transmission of information.
Description
Technical field
The invention belongs to wirelessly communicate safety of physical layer field, it is related to a kind of encryption peace of eating dishes without rice or wine based on NI USRP-RIO
Full transmission method.
Background technique
Bi-directional relaying communication is obviously improved spectrum efficiency due to that can overcome semiduplex limitation, it is considered to be a new generation
One of key technology of wireless network.So far, academia and industry have expanded a large amount of around bi-directional relaying transmission
Research work, they focus on the efficiency of transmission of raising system and the conceptual design of reliability mostly.However, in recent years, with
Society, the public and educational circles the concern of wireless network secure problem is continued to increase, more and more researchers start from
The angle of safety of physical layer examines bilateral relay network closely, proposes a series of theory analysis and solution.Currently, for double
Safety of physical layer technical research to relay system relate generally to man made noise's injection, relay selection strategy, distributed beams at
Shape etc., these schemes assume that listener-in is the independent individual except network mostly, however in application scenes, relaying itself
It is also likely to be potential listener-in, for example, relay node may be to be disposed by enemy by camouflage in military channels
, or itself disposed by one's own side but invaded or be implanted into virus by enemy, such relay node is during facilitating communications
It can attempt to steal important strategy and tactics information；Furthermore in the office network of government or financial institution, it is poor that different nodes have
The information access rights of alienation, the low node of those information access rights are likely to result in information leakage.It is asked to solve this
Topic, need to propose one in conjunction with terminal node carry out channel reversion and phase compensation come realize signal eat dishes without rice or wine encryption method, utilize
This method, terminal user send signal and identical equivalent channel are undergone to reach relay node, and constellation overlapping then occurs, relays quilt
Compel through random guess return signal, to generate error floor, has thus ensured the transmission safety of information.It is based on to verify
Constellation overlapping validity of the encipherment scheme in practical communication environment of eating dishes without rice or wine, research channel estimation errors, time synchronization error,
The influence to constellation excessive effects and security performance such as channel quantitative error, multipath transmisstion assesses the program in Project Realization
Complexity and feasibility, need design and research and development test verify system.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of sky based on NI USRP-RIO is provided
Mouth encryption safe transmission method, this method can be realized the safe transmission of information.
In order to achieve the above objectives, the encryption safe transmission method of eating dishes without rice or wine of the present invention based on NI USRP-RIO, if double
Include terminal user A, terminal user B and relay node R to relay communications system, the letter between terminal user A and terminal user B
Road is second-rate, and relay node R is needed to assist to complete two-way information interaction, terminal user A, terminal user B and relay node R
Include a host computer and a USRP-2943R equipment, high-speed PCI-e is used between host computer and USRP-2943R equipment
Data line connection, wherein USRP-2943R equipment is responsible between passband analog waveform and discrete base band data as radio-frequency front-end
Conversion, host computer is responsible for all base band data processing, and system works in TDD mode, and relay node R is using amplification
Retransmission protocol, specifically includes the following steps:
1) host computer is to every USRP-2943R equipment time service, so that every USRP-2943R equipment obtains absolute time,
Relay node R persistently sends N number of time synchronization frame, user terminal A and user terminal B using the signal calibration itself received
The channel triggered time, so that itself is synchronous with the triggered time of relay node R, wherein the time synchronization frame includes relaying section
The frame number that point R is sent, user terminal A and user terminal B judge whether the time synchronization stage terminates using the frame number；
2) two-way relay communication system enters uplink channel estimation and interacts stage, i.e. user terminal A with channel state information
Channel estimation frame alternately is sent to relay node R first with user terminal B, the channel estimation frame includes for channel estimation
Pilot frequency sequence, relay node R estimate channel after receiving the channel estimation frame from user terminal A and user terminal B first
hA RWith channel hB R, then to channel hA RAnd hB RAmplitude and angle quantified and encoded respectively, then coding result it
Preceding insertion pilot tone is simultaneously broadcast to user terminal A and user terminal B, and user terminal A and user terminal B receive relay node R transmission
Signal after estimate channel h respectivelyR AAnd channel hR B, channel information h is then obtained by relevant detectionA RAnd hB R；
3) user terminal A and user terminal B complete two-way information interaction under the auxiliary of relay node R.
The specific operation process of time synchronization in step 1) are as follows:
11) before entry time synchronizing process, system, from internet acquisition time, is then distinguished using three host computers
The USRP-2943R equipment controlled it carries out time service, so that every USRP-2943R equipment is obtained absolute time, then user
Terminal A, user terminal B and relay node R are about scheduled on not using the clock log relative time inside USRP-2943R equipment
The synchronization t come opens transmission channel and receiving channel simultaneously；
12) when relaying the internal clocking arrival time t of node R, relay node R opens radio-frequency channel, and using T as the period
Synchrodata frame is persistently sent, the frame length of synchrodata frame is Tc, syndiotactic sequence and control number when each synchrodata frame includes
According to, wherein the type and size information of serial number and to be sent file of the control data bag containing the synchronization frame；
13) when the internal clocking of user terminal reaches t moment, user terminal opens radio-frequency channel and receives relay node
The signal that R is sent, wherein the length T of receiving time windoww> Tc, user terminal using the data that are received in i-th of time window with
Known short-range missile frequency sequence carries out related operation, obtains correlation peak, to judge that the i-th frame receives whether data include relay node hair
The time synchronization frame sent, wherein when the correlation peak is more than or equal to thresholding δ0When, then it is assumed that it is included in receiving time window
Time synchronization frame；When the correlation peak is less than thresholding δ0When, then it is assumed that do not include time synchronization frame in the receiving time window, uses
Family terminal A and user terminal B adjusts T according to the position of relevant peaksi+1Size, entire data frame packet contains when any moment N
In the receiving time window, and it is in the front end of receiving time window, to realize relay node R and user terminal A and user
The precise synchronization of the time shaft of terminal B, user terminal A and user terminal B can decode synchronization frame serial number and text to be sent
The type and size information of part, time synchronization stage terminate.
Amplitude quantizing in step 2) uses 20 bit uniform quantizations, and angular quantification uses 8 bit uniform quantizations.
The concrete operations of step 3) are as follows:
User terminal A and user terminal B are handled according to 4 pairs of transmitting signals of table, are then broadcast to relay node R, table 4
InWithIndicate the estimated value of the channel coefficients on i-th of subcarrier；
Table 4
Relay node R first amplifies the signal received after receiving signal, then after next time slot will amplify
Signal be broadcast to user terminal A and user terminal B, wherein relay node R solves the signal received according to table 5
Code；
Table 5
User terminal A and user terminal B receive the signal of relay node R forwarding, and according to table 6 to the signal received
It is handled, to recover the data file of other side's transmission；
Table 6
The invention has the following advantages:
Encryption safe transmission method of eating dishes without rice or wine of the present invention based on NI USRP-RIO utilizes use when specific operation
Family terminal A, user terminal B and relay node R realize that the synchronization of time can adapt to independent of GPS or centralized control automatically
Relative complex transmission environment can be supported other to design around two-way insincere relayed communications by small-scale change
The verification experimental verification of safe transmission method of physical layer has good extended capability.The synchronization of each node time simultaneously, so that different
What node can act in agreement carries out transmitting-receiving switching, so that the realization for bi-directional relaying transmission provides premise, in addition, passing through letter
Road estimation and CSI interactive process guarantee that each node can obtain the channel information for the detection that inverts and be concerned with for realizing channel, with
Realize the safe transmission of information.
Detailed description of the invention
Fig. 1 is the schematic diagram of time synchronization frame structure in the present invention；
Fig. 2 is the schematic diagram of time synchronization process in the present invention；
Fig. 3 is the schematic diagram for the channel estimation frame structure that user terminal is sent；
Fig. 4 is the schematic diagram for the channel estimation frame structure that relay node is sent；
Fig. 5 is the schematic diagram for the signal frame that user terminal is sent to relay node；
Fig. 6 is the process chart of each node in the present invention；
Fig. 7 is operational process schematic diagram of the invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 1, the encryption safe transmission method of eating dishes without rice or wine of the present invention based on NI USRP-RIO includes following step
It is rapid:
If two-way relay communication system includes terminal user A, terminal user B and relay node R, terminal user A and terminal
Channel quality between user B is poor, it is therefore desirable to which relay node R assists to complete two-way information interaction, and relay node R is auxiliary
Supplementary information attempts the message of decoding terminal user transmission during transmitting, can for ensure information to cause information leakage
It leans on and safe transmission, two-way relay communication system uses the encryption method of eating dishes without rice or wine being overlapped based on constellation, two-way relay communication system
In each node be made of a host computer and a USRP-2943R equipment, adopted between host computer and USRP-2943R equipment
Connected with high-speed PCI-e data line, wherein USRP-2943R equipment is used as radio-frequency front-end, responsible passband analog waveform with it is discrete
Conversion between base band data, host computer are responsible for all base band data processing, and system works in TDD mode (TDD),
Relay node R uses amplification forwarding agreement, specifically includes the following steps:
1) host computer is to every USRP-2943R equipment time service, so that every USRP-2943R equipment obtains absolute time,
Relay node R persistently sends N number of time synchronization frame, user terminal A and user terminal B using the signal calibration itself received
The channel triggered time, so that itself is synchronous with the triggered time of relay node R, it include relay node R in the time synchronization frame
The frame number of transmission, user terminal A and user terminal B judge whether the time synchronization stage terminates using the frame number；
The specific operation process of time synchronization are as follows:
11) before entry time synchronizing process, system, from internet acquisition time, is then distinguished using three host computers
The USRP-2943R equipment controlled it carries out time service, so that every USRP-2943R equipment is obtained absolute time, then user
Terminal A, user terminal B and relay node R are about scheduled on not using the clock log relative time inside USRP-2943R equipment
Carry out synchronization t while opening transmission channel and receiving channel；
12) when relaying the internal clocking arrival time t of node R, relay node R opens radio-frequency channel, and using T as the period
Synchrodata frame is persistently sent, the frame length of synchrodata frame is Tc, syndiotactic sequence and control number when each synchrodata frame includes
According to the type and size information of serial number and to be sent file of the control data bag containing the synchronization frame；
13) when the internal clocking of user terminal reaches t moment, user terminal opens radio-frequency channel and receives relay node
The signal that R is sent, wherein the length of receiving time window is Tw> Tc, user terminal utilizes the data received in i-th of time window
Related operation is carried out with known short-range missile frequency sequence, obtains correlation peak, to judge that the i-th frame receives whether data include relay node
The time synchronization frame of transmission, wherein when the correlation peak is more than or equal to thresholding δ0When, then it is assumed that it has been wrapped in receiving time window
Frame containing time synchronization；When the correlation peak is less than thresholding δ0When, then it is assumed that do not include time synchronization frame in the receiving time window,
User terminal A and user terminal B are according to the position of relevant peaks adjustment Ti+1Size, entire data frame packet when any moment N
It is contained in the receiving time window, and is in the front end of receiving time window, to realize relay node R and user terminal A and use
The precise synchronization of the time shaft of family terminal B, user terminal A and user terminal B can decode the serial number of synchronization frame and to be sent
The type and size information of file, time synchronization stage terminate.
2) after the time synchronization stage, two-way relay communication system enters uplink channel estimation and channel state information
(CSI) interaction stage, user terminal A and user terminal B alternately send channel estimation frame, the channel to relay node R first
Estimate that frame includes the pilot frequency sequence for channel estimation, relay node R receives the channel from user terminal A and user terminal B
Channel h is estimated first after estimation frameA RWith channel hB R, then to channel hA RAnd hB RAmplitude and the angle amount of progress respectively
Change and coding, finally, be inserted into pilot tone before coding result and be broadcast to user terminal A and user terminal B, user terminal A and
User terminal B estimates channel h after receiving the signal that relay node R is sent respectivelyR AAnd channel hR B, then pass through relevant detection
Obtain channel information hA RAnd hB R；
The concrete operations of step 2) are as follows:
It includes three time slots that uplink channel estimation, which interacts the stage altogether with channel state information (CSI), wherein in the first two
Gap, user terminal A and user terminal B alternately send channel estimation frame to relay node R, and frame structure is as shown in figure 3, the letter
Road estimates that frame includes short-range missile frequency sequence and random data, and the effect of the random data is to guarantee channel estimation frame and time synchronization frame
Length it is consistent, short pilots by length be 63 m-sequence form, short pilots are repeated 10 times, constitute synchronizing sequence sync1；
Base band signal process process before user terminal A and user terminal B transmission signal is worth noting as shown in table 1
: 101 OFDM symbols are occupied since random data is total, system amounts in the random data of the first step generates to be produced
Raw 101 ￡ 63=6363 bits, and the probability that each bit is 0 or 1 is 1/2.
Table 1
Made after the signal that relay node R receives user terminal A or user terminal B is sent using short pilots and reception data
Related operation obtains correlation peak, then the initial position of time synchronization frame is searched by correlation peak, then to the data received
It being handled, treatment process is inverse process shown in table 1, after relaying node R carried out OFDM demodulation to reception signal,
The receipt signal model of relay node R are as follows:
Wherein,For the channel gain on i-th of subcarrier,For reception of the relay node R on i-th of subcarrier
Signal,For the equivalent noise on i-th of subcarrier, the then estimated value for the channel coefficients that relay node R is obtained are as follows:
Similarly, relay node R can obtain channel coefficientsEstimated value
Relay node R complete channel estimation after the channel information estimated is quantified, encode and base band data at
Reason, treatment process are as shown in table 2, wherein quantizing process includes amplitude quantizing and angular quantification, and amplitude quantizing is equal using 20 bits
Even quantization, angular quantification use 8 bit uniform quantizations；Data after quantization after (7,4)-Hamming code encoder by exporting
49 bits information to be sent；WithCorresponding 49 bit information obtains 49 stars after passing through QPSK constellation mapping
Seat symbol, is respectively mapped to 1~49 sub-carriers, 50~63 sub-carriers and zero sub-carriers for 49 constellation symbols
Do not send data, and whole zero setting；Then the constellation symbol mapped is sent into OFDM modulator by relay node R, and in OFDM
Time synchronization sequence sync1 is inserted into the front end that modulator exports result, is then broadcast to user terminal A and user terminal B, relays
Node R sends the frame structure of signal as shown in figure 4, as shown in Figure 4, in 101 OFDM symbols, preceding 63 symbols are corresponding in turn to
Channel coefficients on each subcarrier, rear 28 symbols are the data filled at random, to ensure channel estimation frame and time synchronization
Frame length is consistent.
Table 2
After user terminal A and user terminal B receive signal, to signal processing as shown in table 3, user terminal A
And user terminal B first carries out frame synchronization, then carries out OFDM demodulation to the data after synchronizing, and then carries out downlink letter using sync1
Road estimation, obtains respectivelyWithTo complete channel estimation, wherein on i-th of subcarrier, the reception of user terminal A
Signal model are as follows:
On i-th of subcarrier, the receipt signal model of user terminal B are as follows:
It utilizesWithUser terminal A and user terminal B carry out relevant detection respectively and obtain channel informationWithTo complete whole channel estimation and CSI interaction.
Table 3
3) user terminal A and user terminal B complete two-way information interaction under the auxiliary of relay node.
Channel estimation interacted with CSI the stage terminate after system enter data transfer phase, in this stage, user terminal
A and user terminal B complete two-way information interaction under the auxiliary of relay node R.
Terminal user A and the terminal B data frame structure sent are as shown in figure 5, data frame structure includes short pilots
(sync1), long pilot tone (sync2) and data, wherein short pilots part is used for frame synchronization, and long pilot portion is used for real-time downlink
Channel estimation, data portion carry information to be transmitted, and short pilots are identical as the short pilots of channel estimation frame and time synchronization frame；
Long pilot tone uses design parameter identical with data segment, i.e., each OFDM symbol occupies 2048 subcarriers, circulating prefix-length
It is 512, zero insertion forms among the m-sequence that long pilot tone is 1023 by length, and user terminal A and user terminal B are in an orthogonal manner
Respective pilot frequency sequence is inserted into subcarrier, user terminal A occupies even subcarriers, and user terminal B occupies odd number and carries
Wave, zero sub-carriers zero setting.
In data transfer phase, user terminal A, user terminal B and relay node R are completed by a cycle of two time slots
Two-way information interaction, wherein in the first time slot, user terminal A and user terminal B send information to relay node R simultaneously, use
The signal frame structure that family terminal A and user terminal B are sent is as shown in figure 5, user terminal A and user terminal B are forming physics letter
Base band data treatment process before number frame is as shown in table 4；
Table 4
Relay node R receives signal model in the first time slot are as follows:
Wherein,The data sent for user terminal A；For user terminal B send data, due to channel estimation miss
The channel reversion that the influence of the factors such as difference, quantization error and channel time-varying, user terminal A and user terminal B cannot achieve, i.e.,WithEquivalent channel coefficient it is different, the reception channel model of relay node R are as follows:
Wherein,It is user terminal A, user terminal B after consideration channel estimation errors and channel fluctuation in
After the equivalent channel of node R, relay node R is receiving signalThe letter of decoding user terminal A and user terminal B is attempted later
Breath, it is as shown in table 5 to signal processing, it is worth noting that, relay node R is in addition to attempting to decode user terminal A and use
Other than the transmission content of family terminal B, need to complete amplification forwarding operation, concrete methods of realizing in second time slot are as follows: relaying
Node R carries out digital amplification after receiving signal, and data are then fed directly to USRP-2943R equipment.
Table 5
Since user terminal A and user terminal B have symmetry, the present invention is right by taking the decoding process of user terminal A as an example
The base band signal process process of user terminal A is illustrated, and in the second time slot, terminal user A is theoretically on t-th of subcarrier
The reception signal form in face are as follows:
However due to the influence of the factors such as channel estimation errors, quantization error, inter-node synchronous error and channel time-varying, use
The practical receipt signal model of family terminal A are as follows:
Wherein,For equivalent down channel coefficient, the information sent for acquisition user terminal BUser terminal A
Equivalent channel coefficient is estimated first with long pilot frequency sequenceWithThen it eliminates to obtain statistic by self-interference；
End user terminal A channel model according to formula (9) completes signal detection, at the baseband signal of user terminal A
Reason process is as shown in table 6, and first to fourth step in table 6 is explained below, and in the first step, user terminal A will
Sync1 and reception signal carry out related operation, the rough estimate value derived from interference signal Yu echo signal initial position, due to certainly
It influences each other between interference signal and echo signal, therefore there may be synchronous errors for rough estimate value；Second step is utilized from dry
It disturbs signal and time domain channel estimate and synchronize to self-interference signal, the time-domain received signal of user terminal A are as follows:
yA=hrAxA+hrBxB+nA (10)
Wherein, xA、xBThe transmission signal phasor for being user terminal A and user terminal B in time domain, yAFor user terminal A
Time-domain received signal vector, hrA、hrBFor the time domain channel coefficients of link R → A and R → B, nATo consider connecing for relay node R
Equivalent noise after receipts machine noise and the receiver noise of user terminal A, the above-mentioned distinguishable multipath of model hypothesis channel are one
Item, and channel coefficients remain unchanged within the time of a frame signal, channel coefficients hrAEstimation method are as follows: by time domain self-interference
Signal xARelated operation is carried out with signal is received, and correlation peak square is normalized to obtain channel to self-interference norm
Estimated valueI.e.
Due to xAAnd xBIndependently of each other, and mean value is zero, soIt is approximately zero, and because noise power is far below
Signal power, soThird step carries out the elimination of time domain self-interference, mathematical description are as follows:
Since the frame synchronization in the first step is there may be error, the 4th step utilizes the signal y for eliminating self-interferenceA (rem)It is right
Echo signal re-starts synchronization, to reduce synchronization failure probability.
Table 6
The design principle and channel estimation methods of long pilot tone sync2 is as follows: in order to successfully carry out signal detection,
Each terminal must real-time estimation go out equivalent transient channel informationWithHowever, the letter of user terminal A and user terminal B
It number interferes with each other on each subcarrier, so that channel estimation is unable to complete, so the pilot tone of user terminal A and user terminal B
Sequence needs to be inserted into an orthogonal manner on 2048 subcarriers, i.e., the pilot tone of user terminal A occupies even number sub-carriers, and
The pilot tone of user terminal B occupies odd number sub-carriers, design in this way, works as i=0, when 2,4,6 ..., 2046, user
The receipt signal model of terminal A are as follows:
Work as i=1, when 3,5 ..., 2047, the receipt signal model of user terminal A are as follows:
User terminal A is completed using formula (13)Even number sub-carrier channels estimation, utilize formula (14) complete's
The estimation of odd number sub-carrier channels, is then obtained by interpolationWithChannel estimation value on all subcarriers, it is described to insert
Value method are as follows:
So far, an information interaction periodicity of data transfer phase terminates.
Claims (4)
1. a kind of encryption safe transmission method of eating dishes without rice or wine based on NI USRP-RIO, which is characterized in that set two-way relay communication system
Comprising terminal user A, terminal user B and relay node R, the channel quality between terminal user A and terminal user B is poor, needs
Relay node R is wanted to assist to complete two-way information interaction, terminal user A, terminal user B and relay node R include one upper
Machine and a USRP-2943R equipment are connected between host computer and USRP-2943R equipment using high-speed PCI-e data line,
In, USRP-2943R equipment is as radio-frequency front-end, the conversion being responsible between passband analog waveform and discrete base band data, host computer
It is responsible for all base band data processing, system works in TDD mode, and relay node R uses amplification forwarding agreement, specifically
The following steps are included:
1) host computer is to every USRP-2943R equipment time service, so that every USRP-2943R equipment obtains absolute time, relaying
Node R is persistently sent N number of time synchronization frame, user terminal A and user terminal B and is touched using the channel of the signal calibration itself received
The time is sent out, so that itself is synchronous with the triggered time of relay node R, wherein the time synchronization frame is sent comprising relay node R
Frame number, user terminal A and user terminal B judge whether the time synchronization stage terminates using the frame number；
2) two-way relay communication system enters uplink channel estimation and interacts stage, i.e. user terminal A and use with channel state information
Family terminal B alternately sends channel estimation frame to relay node R first, and the channel estimation frame includes the pilot tone for channel estimation
Sequence, relay node R estimate channel h after receiving the channel estimation frame from user terminal A and user terminal B firstA RWith
Channel hB R, then to channel hA RAnd hB RAmplitude and angle quantified and encoded respectively, be then inserted into before coding result
Pilot tone is simultaneously broadcast to user terminal A and user terminal B, and user terminal A and user terminal B receive the signal that relay node R is sent
Estimate channel h respectively afterwardsR AAnd channel hR B, channel information h is then obtained by relevant detectionA RAnd hB R；
3) user terminal A and user terminal B complete two-way information interaction under the auxiliary of relay node R.
2. the encryption safe transmission method of eating dishes without rice or wine according to claim 1 based on NI USRP-RIO, which is characterized in that step
It is rapid 1) in time synchronization specific operation process are as follows:
11) before entry time synchronizing process, system utilizes three host computers from internet acquisition time, then respectively to it
The USRP-2943R equipment controlled carries out time service, so that every USRP-2943R equipment is obtained absolute time, then user terminal
A, user terminal B and relay node R is using the clock log relative time inside USRP-2943R equipment, and is about scheduled on future
Synchronization t opens transmission channel and receiving channel simultaneously；
12) when relaying the internal clocking arrival time t of node R, relay node R opens radio-frequency channel, and continues by the period of T
Synchrodata frame is sent, the frame length of synchrodata frame is Tc, syndiotactic sequence and control data when each synchrodata frame includes,
In, the type and size information of serial number and to be sent file of the control data bag containing the synchronization frame；
13) when the internal clocking of user terminal reaches t moment, user terminal opens radio-frequency channel and receives relay node R hair
The signal sent, wherein the length T of receiving time windoww> Tc, user terminal using the data received in i-th of time window with it is known
Short-range missile frequency sequence carry out related operation, obtain correlation peak, with judge the i-th frame reception data whether include what relay node was sent
Time synchronization frame, wherein when the correlation peak is more than or equal to thresholding δ0When, then it is assumed that included time in receiving time window
Synchronization frame；When the correlation peak is less than thresholding δ0When, then it is assumed that do not include time synchronization frame in the receiving time window, user is whole
A and user terminal B is held to adjust T according to the position of relevant peaksi+1Size, entire data frame packet is contained in institute when any moment N
It states in receiving time window, and is in the front end of receiving time window, to realize relay node R and user terminal A and user terminal B
Time shaft precise synchronization, user terminal A and user terminal B can decode the serial number of synchronization frame and the class of file to be sent
Type and size information, time synchronization stage terminate.
3. the encryption safe transmission method of eating dishes without rice or wine according to claim 1 based on NI USRP-RIO, which is characterized in that step
It is rapid 2) in amplitude quantizing use 20 bit uniform quantizations, angular quantification use 8 bit uniform quantizations.
4. the encryption safe transmission method of eating dishes without rice or wine according to claim 1 based on NI USRP-RIO, which is characterized in that step
Rapid concrete operations 3) are as follows:
User terminal A and user terminal B are handled according to 4 pairs of transmitting signals of table, are then broadcast to relay node R, in table 4WithIndicate the estimated value of the channel coefficients on i-th of subcarrier；
Table 4
Relay node R first amplifies the signal received after receiving signal, then in next time slot by amplified letter
Number it is broadcast to user terminal A and user terminal B, wherein relay node R is decoded the signal received according to table 5；
Table 5
User terminal A and user terminal B receive the signal of relay node R forwarding, and are carried out according to table 6 to the signal received
Processing, to recover the data file of other side's transmission；
Table 6
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112073109A (en) * | 2020-08-19 | 2020-12-11 | 南京奈思电子科技有限公司 | Method and system for reducing system performance influence generated by channel estimation error |
| CN113573308A (en) * | 2021-09-22 | 2021-10-29 | 四川创智联恒科技有限公司 | Method and module for improving air interface security |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932083A (en) * | 2011-08-11 | 2013-02-13 | 中兴通讯股份有限公司 | Microwave time synchronization method and device |
| CN107204798A (en) * | 2017-05-12 | 2017-09-26 | 南京邮电大学 | A kind of amplification relay forwarding optimization system and its optimization method based on USRP |
| CN107359929A (en) * | 2017-07-27 | 2017-11-17 | 西安交通大学 | Based on the encryption method of eating dishes without rice or wine that constellation is overlapping in a kind of bidirectional relay system |
| US20180224492A1 (en) * | 2014-09-04 | 2018-08-09 | University Of Washington | Detecting user-driven operating states of electronic devices from a single sensing point |
| US10169119B1 (en) * | 2011-08-28 | 2019-01-01 | Ross Daniel Snyder | Method and apparatus for improving reliability of digital communications |
-
2019
- 2019-05-30 CN CN201910465554.1A patent/CN110365447B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932083A (en) * | 2011-08-11 | 2013-02-13 | 中兴通讯股份有限公司 | Microwave time synchronization method and device |
| US10169119B1 (en) * | 2011-08-28 | 2019-01-01 | Ross Daniel Snyder | Method and apparatus for improving reliability of digital communications |
| US20180224492A1 (en) * | 2014-09-04 | 2018-08-09 | University Of Washington | Detecting user-driven operating states of electronic devices from a single sensing point |
| CN107204798A (en) * | 2017-05-12 | 2017-09-26 | 南京邮电大学 | A kind of amplification relay forwarding optimization system and its optimization method based on USRP |
| CN107359929A (en) * | 2017-07-27 | 2017-11-17 | 西安交通大学 | Based on the encryption method of eating dishes without rice or wine that constellation is overlapping in a kind of bidirectional relay system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112073109A (en) * | 2020-08-19 | 2020-12-11 | 南京奈思电子科技有限公司 | Method and system for reducing system performance influence generated by channel estimation error |
| CN113573308A (en) * | 2021-09-22 | 2021-10-29 | 四川创智联恒科技有限公司 | Method and module for improving air interface security |
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