CN106789771A - Data transmission method and device - Google Patents

Abstract

The embodiment of the present invention provides a kind of data transmission method and device.Data transmission method provided in an embodiment of the present invention, including：Transmitting terminal estimates channel parameter according to the pilot signal for receiving；If the channel parameter includes legitimate channel parameter and illegal channel parameter simultaneously, the transmitting terminal determines minimal characteristic vector according to the legitimate channel parameter and the illegal channel parameter；If the vectorial corresponding transmit power of the minimal characteristic is less than or equal to maximum power threshold, the power of the transmitting terminal sending signal is determined according to minimal characteristic vector.Technical scheme can ensure legitimate receipt end can normal received signal while, change that the mode of transmit power minimizes using channel parameter deteriorates the SINR at illicit reception end, and then enhances the security of communication.

Description

Data transmission method and device

Technical field

The present invention relates to communication technical field, more particularly to a kind of data transmission method and device.

Background technology

With the progress and the development of science and technology of society, the communication technology is being constantly changing and is improving life and the work of people Make mode.The communication technology is divided into wire communication and radio communication, wherein, the mode of radio communication makes people break away from wire communication Constraint, improve work with life convenience.

Wireless communication system evolves as forth generation GSM from the first Generation Mobile Communication System, so And, security of system problem is carried throughout all the time, as the problem that crucial and core in radio communication needs to solve.

In the prior art, OFDM (orthogonal frequency divisionmultiplexing, orthogonal frequency Multiplexing) system, encryption is realized using the mode such as multiple antennas random weighting, man made noise of transmitting terminal, when the antenna book of listener-in More than transmitting terminal antenna number when, cipher mode of the prior art cannot ensure the security of GSM.

The content of the invention

The embodiment of the present invention provides a kind of data transmission method and device, with overcome in the prior art using transmitting terminal with The modes such as machine weighting, man made noise realize the relatively low problem of the mode security of encryption.

The embodiment of the present invention provides a kind data transmission method, including：

Transmitting terminal estimates channel parameter according to the pilot signal for receiving；

If the channel parameter includes legitimate channel parameter and illegal channel parameter simultaneously, the transmitting terminal is according to the conjunction Method channel parameter and the illegal channel parameter determine minimal characteristic vector；

If the vectorial corresponding transmit power of the minimal characteristic is less than or equal to maximum power threshold, according to the minimum Characteristic vector determines the power of the transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：

If the corresponding transmit power of minimal characteristic vector is more than maximum power threshold, according to Caro need-Ku En- Dichotomy in Plutarch KKT conditions determines the power of transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the transmitting terminal Minimal characteristic vector is determined according to the legitimate channel parameter and the illegal channel parameter, including：

The transmitting terminal calculates legal Q matrixes according to the legitimate channel parameter, and

The transmitting terminal calculates illegal Q matrixes according to the illegal channel parameter；

According to the legal Q matrixes and the illegal Q matrixes, minimal characteristic vector is determined.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the legal Q squares Battle array Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

The illegal Q matrixes Q_eCalculated by equation below：

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_eFor The autocorrelation matrix of channel disturbance and noise in illegal channel；

The minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, it is described minimum special Levy vectorial q_LCorresponding transmit power E is calculated by equation below：

Wherein, γ is QOS (Quality of Service, communication quality standard) threshold value, Q of legitimate channel_bFor legal The Q matrixes of channel,It is the transposition of minimal characteristic vector.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, according to KKT Dichotomy in (Karush-Kuhn-Tucker, Caro needs-Ku En-Plutarch) condition determines the power of transmitting terminal sending signal, Including：

The KKT conditions are calculated by equation below：

When following condition is met, stop calculating,

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

It is describedCorresponding transmit power is the power of the transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：

If the channel parameter only include legitimate channel parameter, the transmitting terminal according to the legitimate channel parameter determination most Big characteristic vector；

If the corresponding transmit power of the maximal eigenvector is less than or equal to maximum power threshold, according to described Maximal eigenvector determines the power of the transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：

If the corresponding transmit power of the maximal eigenvector is more than maximum power threshold, the transmitting terminal does not send letter Number.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, methods described is also Including：

Man made noise, the man made noise is added not to produce interference to the legitimate receipt end in the sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the transmitting terminal According to the legitimate channel parameter determination maximal eigenvector, including：

The transmitting terminal calculates legal Q matrixes according to the legitimate channel parameter；

The legal Q matrixes Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

The maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, it is described maximum special Levy vectorial q₁Corresponding transmit power E is calculated by equation below：

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is maximum The transposition of characteristic vector.

The embodiment of the present invention provides a kind data transmission device, including：

Parameter calculating module, for estimating channel parameter according to the pilot signal for receiving；

Determining module, if including legitimate channel parameter and illegal channel parameter simultaneously for the channel parameter, according to institute State legitimate channel parameter and the illegal channel parameter determines minimal characteristic vector；

Power computation module, if being less than or equal to peak power for the corresponding transmit power of minimal characteristic vector Threshold value, the power of the transmitting terminal sending signal is determined according to minimal characteristic vector.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the power meter Module is calculated to be additionally operable to：

If the vectorial corresponding transmit power of the minimal characteristic is more than maximum power threshold, according in KKT conditions Dichotomy determines the power of transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the determination mould Block, specifically for：

Legal Q matrixes are calculated according to the legitimate channel parameter, and

Illegal Q matrixes are calculated according to the illegal channel parameter；

According to the legal Q matrixes and the illegal Q matrixes, minimal characteristic vector is determined.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the legal Q squares Battle array Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

The illegal Q matrixes Q_eCalculated by equation below：

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_e It is the autocorrelation matrix of channel disturbance and noise in illegal channel；

The minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, it is described minimum special Levy vectorial q_LCorresponding transmit power E is calculated by equation below：

Wherein, γ is the QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is turning for minimal characteristic vector Put.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the power meter Calculate module specifically for：

The KKT conditions are calculated by equation below：

When following condition is met, stop calculating,

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

It is describedCorresponding transmit power is the power of the transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the determination mould Block, is additionally operable to：

If the channel parameter only include legitimate channel parameter, according to the legitimate channel parameter determination maximum feature to Amount；

The power computation module, is additionally operable to：

If the corresponding transmit power of the maximal eigenvector is less than or equal to maximum power threshold, according to described Maximal eigenvector determines the power of the transmitting terminal sending signal.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the power meter Module is calculated, is additionally operable to：

If the corresponding transmit power of the maximal eigenvector is more than maximum power threshold, the transmitting terminal does not send letter Number.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, described device is also Including：

Add module, for adding man made noise in the sending signal, the man made noise is to the legitimate receipt End does not produce interference.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, the power meter Module is calculated, specifically for：

Legal Q matrixes are calculated according to the legitimate channel parameter；

The legal Q matrixes Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

The maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

Aspect as described above and any possible implementation, it is further provided a kind of implementation, it is described maximum special Levy vectorial q₁Corresponding transmit power E is calculated by equation below：

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is maximum The transposition of characteristic vector.

Data transmission method provided in an embodiment of the present invention and device, the pilot signal that is received by transmitting terminal are estimated Corresponding channel parameter, it can be judged channel according to channel parameter, determine that it is legitimate channel or illegal channel, Transmitting terminal determines the characteristic vector of frequency spreading wave according to corresponding channel parameter, and then combines transmission according to corresponding characteristic vector The general power at end determines the power of sending signal, be able to can be normally received legitimate receipt end is ensured by the technical program While signal, the SINR for deteriorating illicit reception end that the mode of transmit power is minimized is changed using channel parameter (Signal to Interfenence plus Noise Ratio, Signal to Interference plus Noise Ratio), and then enhance communication Security, solves the mode safety for realizing encryption using modes such as the random weighting of transmitting terminal, man made noises in the prior art The relatively low problem of property.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are this hairs Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with Other accompanying drawings are obtained according to these accompanying drawings.

Fig. 1 is the flow chart of data transmission method embodiment one provided in an embodiment of the present invention.

Fig. 2 is the flow chart of data transmission method embodiment two provided in an embodiment of the present invention；

Fig. 3 is the flow chart of data transmission method embodiment three provided in an embodiment of the present invention；

Fig. 4 is the flow chart of data transmission method example IV provided in an embodiment of the present invention；

Fig. 5 is the flow chart of data transmission method embodiment five provided in an embodiment of the present invention；

Fig. 6 is the simulation result figure of embodiment of the present invention data transmission method embodiment；

Fig. 7 is another simulation result figure of embodiment of the present invention data transmission method embodiment；

Fig. 8 is the structural representation of data transmission device embodiment one provided in an embodiment of the present invention；

Fig. 9 is the structural representation of data transmission device embodiment five provided in an embodiment of the present invention.

Specific embodiment

To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.

The term for using in embodiments of the present invention is the purpose only merely for description specific embodiment, and is not intended to be limiting The present invention." one kind ", " described " and " being somebody's turn to do " of singulative used in the embodiment of the present invention and appended claims It is also intended to include most forms, unless context clearly shows that other implications.

Embodiment one

Fig. 1 is the flow chart of data transmission method embodiment one provided in an embodiment of the present invention, as shown in figure 1, this implementation The data transmission method of example, specifically may include steps of：

101st, transmitting terminal estimates channel parameter according to the pilot signal for receiving.

The data transmission method provided in the embodiment of the present invention can apply to SISO (single input single Output, the output of single-enter list) system, transmitting terminal and receiving terminal can be included in system, wherein, a day is included in transmitting terminal Line.In order to strengthen the security of communication, in embodiments of the present invention, transmitting terminal is first-selected it needs to be determined that hair before sending signal Channel parameter between sending end and receiving terminal, the determination mode of channel parameter can be by the way of channel estimation.Specifically, connect Receiving end estimates channel parameter to transmitting terminal pilot signal transmitted, transmitting terminal according to the pilot signal for receiving.

Because receiving terminal can have two kinds, one kind is legitimate receipt end, and another kind is illegal receiving terminal, accordingly, channel Also two kinds can be divided into, one kind is legitimate channel, another kind is illegal channel.Wherein, being between legitimate receipt end and transmitting terminal can Normally to be communicated, and the presence of illegal receiving terminal can threaten the security of system, for example, illicit reception end tapped signal The leakage of message can be caused.

Therefore, in embodiments of the present invention, what the pilot signal that transmitting terminal is received can send comprising legitimate receipt end Pilot signal and illegally connect that the pilot signal or legitimate receipt end that pilot signal or illicit reception end send send The pilot signal that receiving end sends.Accordingly, in channel parameter can comprising legitimate channel parameter or illegal channel parameter or Person's legitimate channel parameter and illegal channel parameter.

If the 102, channel parameter includes legitimate channel parameter and illegal channel parameter simultaneously, transmitting terminal is joined according to legitimate channel Number and illegal channel parameter determine minimal characteristic vector.

When transmitting terminal estimate in the channel parameter for obtaining simultaneously comprising legitimate channel parameter and during illegal channel parameter, Then transmitting terminal determines to there may be illicit reception end, accordingly, it would be desirable to the waveform of transmitting terminal sending signal is adjusted, to reach To the purpose that interference illicit reception end receives.

Assuming that the channel that legitimate receipt end and illicit reception end use when being communicated with transmitting terminal is that common Rayleigh is more Footpath fading channel, the then parameter vector for setting legitimate channel is h_b=[h_b,1,h_b,2,…,h_b,m], the parameter vector of illegal channel It is h_e=[h_e,1,h_e,2,…,h_e,m], wherein, m is keeping count of for decomposable multipath.

In embodiments of the present invention, determined according to legitimate channel parameter and illegal channel parameter the minimal characteristic of waveform to Amount, can specifically be calculated in the following way：

Transmitting terminal calculates legal Q matrixes according to legitimate channel parameter, and

Transmitting terminal calculates illegal Q matrixes according to illegal channel parameter；

According to legal Q matrixes and illegal Q matrixes, minimal characteristic vector is determined.

Wherein, legal Q matrixes Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel.

Specifically, in embodiments of the present invention, H_bWith following general type：

During a concrete implementation, R_bCan be calculated by equation below：

Wherein, z_bIt is the interference of other receiving terminals, n_bIt is white Gaussian noise.

It should be noted that in actual applications, if transmitting terminal does not have sending signal, can be received by transmitting terminal Signal, and all of signal is averaged estimate interference and white Gaussian noise autocorrelation matrix R_b, accordingly, Ke Yitong Equation below is crossed to be calculated：

Wherein, z_bN () is n-th interference of other receiving terminals, n_bIt is white Gaussian noise.

Illegal Q matrixes Q_eCalculated by equation below：

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_eFor The autocorrelation matrix of channel disturbance and noise in illegal channel.

In embodiments of the present invention, H_eWith H_bForm is identical, R_eWith R_bCalculation it is identical, no longer gone to live in the household of one's in-laws on getting married herein State.

Minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

If the 103, the corresponding transmit power of minimal characteristic vector is less than or equal to maximum power threshold, according to minimal characteristic Vector determines the power of transmitting terminal sending signal.

During transmitting terminal sending signal, can be indicated by equation below：

Wherein, E represents the bit energy of sending signal in transmitting terminal, and b (n) ∈ { ± 1 } represent n-th that transmitting terminal sends Bit signal, nT represents n-th moment, and value 0 arrives just infinite,Represent frequency conversion.S (t-nT) represents signal to be sent Waveform.

After transmitting terminal sends signal, signal is by after carrier wave demodulation and pulse-shaping, legitimate receipt terminates the letter for receiving Number can be expressed as：

Wherein, z_bIt is the interference of other receiving terminals, n_bIt is white Gaussian noise.

Assuming that the feelings that legitimate receipt end is filtered in extensive time multiplexed signal using general linear maximum SINR wave filters Under condition, the signal that legitimate receipt end is recovered is expressed as：

Wherein,Represent maximum SINR wave filters.

Then in this case, after signal filtering of the use maximum SINR wave filters to recovery, output SINR can pass through Equation below is represented：

Wherein, s is frequency spreading wave.

Due to the broadcast characteristic of channel, illicit reception end can also obtain the signal received similar to legitimate receipt termination, Assuming that illicit reception end can know the frequency spreading wave s that channel parameter He and transmitting terminal are used, then its same maximum SINR is filtered Ripple treatment receives signal to recover original information, and for illicit reception end, output SINR can be by equation below table Show：

From SINR_bAnd SINR_eComputing formula in it is known that due to the Q matrixes and the Q squares of illegal channel of legitimate channel Battle array is different, therefore, by the change to s frequency spreading waves so that SINR_bAnd SINR_eWith maximum otherness.

Therefore, calculated according to following target equation：

Es^HQ_eS ＞ γ

s^HS=1

E≤E_max

Wherein, γ represents the QOS threshold values of legitimate channel, and the QOS threshold values can be set according to actual needs, E_maxFor The maximum available energy of transmitting terminal, i.e. ceiling capacity threshold value.

Therefore, in embodiments of the present invention, minimal characteristic vector q is determined in step 102_L, according to above-mentioned target formula, It is determined that using the energy of the corresponding sending signal of minimal characteristic vector, it can be calculated by equation below：

If the energy for now obtaining meets E≤E_max, then the corresponding vectors of frequency spreading wave s are q_L, transmitting terminal sends to be believed Number power be E.

Data transmission method provided in an embodiment of the present invention, the pilot signal received by transmitting terminal is corresponding to estimate Channel parameter, it can be judged channel according to channel parameter, determine that it is legitimate channel or illegal channel, transmitting terminal The characteristic vector of frequency spreading wave is determined according to corresponding channel parameter, and then according to the total of corresponding characteristic vector combination transmitting terminal Power determines the power of sending signal, by the technical program can be capable of normal received signal legitimate receipt end is ensured Meanwhile, change that the mode of transmit power minimizes using channel parameter deteriorates the SINR at illicit reception end, and then enhances The security of communication, solves the side for realizing encryption using modes such as the random weighting of transmitting terminal, man made noises in the prior art The relatively low problem of formula security.

Embodiment two

Fig. 2 is the flow chart of data transmission method embodiment two provided in an embodiment of the present invention, as shown in Fig. 2 this implementation The data transmission method of example, specifically may include steps of：

201st, transmitting terminal estimates channel parameter according to the pilot signal for receiving.

If the 202, channel parameter includes legitimate channel parameter and illegal channel parameter simultaneously, transmitting terminal is joined according to legitimate channel Number and illegal channel parameter determine minimal characteristic vector.

203rd, whether the corresponding transmit power of minimal characteristic vector is judged less than or equal to maximum power threshold, if so, Step 204 is performed, if it is not, performing step 205.

204th, the power of transmitting terminal sending signal is determined according to minimal characteristic vector.

205th, the dichotomy in KKT conditions determines the power of transmitting terminal sending signal.

In embodiments of the present invention, when the corresponding transmit power of minimal characteristic vector is more than ceiling capacity threshold value, explanation Transmit power has exceeded the energy of transmitting terminal, accordingly, it would be desirable to choose the transmit power of frequency spreading wave s in other way. During a concrete implementation, calculated by KKT conditions, calculated by equation below：

When following condition is met, stop calculating,

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

It should be noted that ∈ can be specified according to actual conditions.

When above-mentioned computing formula is met,It is the corresponding vector of frequency spreading wave s, accordinglyIt is corresponding Transmit power is the power of transmitting terminal sending signal.

Data transmission method provided in an embodiment of the present invention, the pilot signal received by transmitting terminal is corresponding to estimate Channel parameter, it can be judged channel according to channel parameter, determine that it is legitimate channel or illegal channel, transmitting terminal The characteristic vector of frequency spreading wave is determined according to corresponding channel parameter, and then according to the total of corresponding characteristic vector combination transmitting terminal Power determines the power of sending signal, by the technical program can be capable of normal received signal legitimate receipt end is ensured Meanwhile, change that the mode of transmit power minimizes using channel parameter deteriorates the SINR at illicit reception end, and then enhances The security of communication, solves the side for realizing encryption using modes such as the random weighting of transmitting terminal, man made noises in the prior art The relatively low problem of formula security.

Embodiment three

Fig. 3 is the flow chart of data transmission method embodiment three provided in an embodiment of the present invention, as shown in figure 3, this implementation Example data transmission method, 103 the step of embodiment one after, can also comprise the following steps：

If the 304th, channel parameter only include legitimate channel parameter, transmitting terminal according to legitimate channel parameter determination maximum feature to Amount.

When transmitting terminal estimated to channel parameter in only comprising legitimate channel parameter when, then transmitting terminal is uncertain is It is no to there are illicit reception end, accordingly, it would be desirable to the waveform of transmitting terminal sending signal by the way of in different from embodiment one It is adjusted, to reach the purpose that interference illicit reception end receives.

In embodiments of the present invention, it is assumed that the channel that legitimate receipt end uses when being communicated with transmitting terminal is common Rayleigh multidiameter fading channel, the then parameter vector for setting legitimate channel is h_b=[h_b,1,h_b,2,…,h_b,m], wherein, m is to divide The multipath of solution keeps count of.

H_bWith following general type：

Then, transmitting terminal calculates legal Q matrixes according to legitimate channel parameter；Legal Q matrixes Q_bCarried out by equation below Calculate：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel.

During a concrete implementation, if transmitting terminal does not have sending signal, the letter that can be received by transmitting terminal Number, and all of signal is averaged estimate interference and white Gaussian noise autocorrelation matrix R_b, accordingly, R_bCan lead to Equation below is crossed to be calculated：

Wherein, z_bN () is n-th interference of other receiving terminals, n_bIt is white Gaussian noise.

In embodiments of the present invention, whether there is because transmitting terminal is uncertain has illicit reception end, therefore, it is determined that spread spectrum Waveform s it is vectorial when, using reduce transmitting terminal send energy by way of, with realize reduce transmitting terminal send signal let out The possibility of dew, improves the security of communication.

Therefore, calculated according to following target equation：

Es^HQ_bS ＞ γ

s^HS=1

E≤E_max

Wherein, E represents the bit energy of sending signal in transmitting terminal, and s is frequency spreading wave, and γ represents the QOS of legitimate channel Threshold value, the QOS threshold values can be set according to actual needs, E_maxBe the maximum available energy of transmitting terminal, i.e. ceiling capacity threshold Value.

It can be seen from above-mentioned target equation, maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

If the 305, the corresponding transmit power of maximal eigenvector is less than or equal to maximum power threshold, according to maximum feature Vector determines the power of transmitting terminal sending signal.

If vector and the maximal eigenvector q of frequency spreading wave s₁When equal, the transmit power of transmitting terminal is minimum.Maximum feature Vectorial q₁Corresponding transmit power E is calculated by equation below：

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is maximum The transposition of characteristic vector.

Compare the vector and maximal eigenvector q of frequency spreading wave s₁When equal, the transmit power and peak power of transmitting terminal Threshold value E_maxRelation, if transmit power E be less than or equal to maximum power threshold E_max, then frequency spreading wave s it is corresponding to It is q to measure₁, the power of transmitting terminal sending signal is E.

Data transmission method provided in an embodiment of the present invention, the pilot signal received by transmitting terminal is corresponding to estimate Channel parameter, it can be judged channel according to channel parameter, determine that it is legitimate channel or illegal channel, work as transmission When end is only capable of estimating legitimate channel parameter, transmitting terminal determines the characteristic vector of frequency spreading wave according to corresponding channel parameter, enters And the power of sending signal is determined according to the general power of corresponding characteristic vector combination transmitting terminal, can by the technical program Ensure legitimate receipt end can normal received signal while, the mode that transmit power is changed using channel parameter is minimized Deteriorate the SINR at illicit reception end, and then enhance the security of communication, solve in the prior art using transmitting terminal with The modes such as machine weighting, man made noise realize the relatively low problem of the mode security of encryption.

Example IV

Fig. 4 is the flow chart of data transmission method example IV provided in an embodiment of the present invention, as shown in figure 4, this implementation The data transmission method of example, specifically may include steps of：

401st, transmitting terminal estimates channel parameter according to the pilot signal for receiving.

402nd, whether transmitting terminal determines channel parameter simultaneously comprising legitimate channel parameter and illegal channel parameter, if so, holding Row step 403, if it is not, performing step 404.

403rd, transmitting terminal determines minimal characteristic vector according to legitimate channel parameter and illegal channel parameter, performs step 405。

404th, transmitting terminal performs step 408 according to legitimate channel parameter determination maximal eigenvector.

405th, whether the corresponding transmit power of minimal characteristic vector is judged less than or equal to maximum power threshold, if so, Step 406 is performed, if it is not, performing step 407.

406th, the power of transmitting terminal sending signal is determined according to minimal characteristic vector.

407th, the dichotomy in KKT conditions determines the power of transmitting terminal sending signal.

408th, whether the corresponding transmit power of maximal eigenvector is judged less than or equal to maximum power threshold, if so, Step 409 is performed, if it is not, performing step 410.

409th, the power of transmitting terminal sending signal is determined according to maximal eigenvector.

410th, transmitting terminal not sending signal.

In embodiments of the present invention, if the corresponding transmit power of maximal eigenvector is more than maximum power threshold, this is illustrated When it cannot be guaranteed that most basic telecommunication service quality, therefore, transmitting terminal not sending signal.

Data transmission method provided in an embodiment of the present invention, when transmitting terminal is only capable of estimating legitimate channel parameter, sends End determines the characteristic vector of frequency spreading wave according to corresponding channel parameter, and then according to corresponding characteristic vector combination transmitting terminal General power determines the power of sending signal, when corresponding characteristic vector can not meet the general power of transmitting terminal, does not send letter Number, by the technical program can ensure legitimate receipt end can normal received signal while, changed using channel parameter What the mode of change transmit power was minimized deteriorates the SINR at illicit reception end, and then enhances the security of communication, solves existing There are the modes such as random weighting, man made noise in technology using transmitting terminal to realize the relatively low problem of the mode security of encryption.

Embodiment five

Fig. 5 is the flow chart of data transmission method embodiment five provided in an embodiment of the present invention, as shown in figure 5, this implementation The data transmission method of example, after step 305 in embodiment three, can also comprise the following steps：

506th, man made noise, man made noise is added not to produce interference to legal receiving terminal in sending signal.

In 304 the step of embodiment three, by way of using the transmission energy for reducing transmitting terminal, to realize reducing hair The possibility of the signal leakage that sending end sends, therefore, in order to further improve the security of communication, in the embodiment of the present invention In, it is possible to use the dump power of transmitting terminal produces man made noise, by man made noise's addition in frequency spreading wave, connects to legal In the case that receiving end does not produce interference, the SINR at illicit reception end is reduced, further disturb illicit reception end for signal Eavesdropping.

Specifically, can be calculated by equation below using the dump power of transmitting terminal：

In order to ensure that man made noise does not produce influence to legal receiving terminal, the man made noise added in spread-spectrum signal needs full Kernel of the foot positioned at frequency spreading wave s.Therefore, the waveform of man made noise, can be calculated by equation below：

Wherein, L is the length of legal Q matrixes, and W is the orthogonal basis of frequency spreading wave s, q₂,…q_LIt is to legal Q matrixes point The vector that solution is obtained.

Data transmission method provided in an embodiment of the present invention, when transmitting terminal is only capable of estimating legitimate channel parameter, sends End determines the characteristic vector of frequency spreading wave according to corresponding channel parameter, and then according to corresponding characteristic vector combination transmitting terminal General power determines the power of sending signal, and adds man made noise in sending signal, receives legitimate receipt end is not being influenceed While signal, the security of communication is further enhanced.

In order to better illustrate the technique effect in the embodiment of the present invention, passed using the data in the embodiment of the present invention Transmission method is emulated, and design parameter is as shown in table 1：

Table 1

Corresponding simulation result, as shown in Figure 6 and Figure 7.

Fig. 6 is the simulation result figure of embodiment of the present invention data transmission method embodiment, as shown in fig. 6, generation in abscissa The QOS threshold values of table legitimate receipt end SINR, the average letter that ordinate represents illicit reception end dries ratio.Three from top to bottom in figure Line segment is represented respectively, and transmitting terminal is unknown to illegal channel parameter to use legitimate receipt end under minimum transmit power sending signal state Data, transmitting terminal with illicit reception end are unknown to illegal channel parameter and addition man made noise's state under legitimate receipt end with Data, the transmitting terminal at the second illicit reception end are to legitimate receipt end under illegal channel parameter known state and the first illicit reception end Data.

Fig. 7 is another simulation result figure of embodiment of the present invention data transmission method embodiment, as shown in fig. 7, abscissa In represent legitimate receipt end SINR threshold values, ordinate represents the bit error rate.Three line segments are represented respectively from top to bottom in figure, transmitting terminal To the bit error rate at the first illicit reception end under illegal channel parameter known case, transmitting terminal is unknown to illegal channel parameter and adds Plus in the case of man made noise the bit error rate at the second illicit reception end, transmitting terminal under service condition known to illegal channel parameter close The bit error rate of method receiving terminal.

Embodiment six

Fig. 8 is the structural representation of data transmission device embodiment one provided in an embodiment of the present invention, as shown in figure 8, this The data transmission device of inventive embodiments can include：Parameter calculating module 11, determining module 12 and power computation module 13.

Parameter calculating module 11, for estimating channel parameter according to the pilot signal for receiving；

Determining module 12, if including legitimate channel parameter and illegal channel parameter simultaneously for channel parameter, according to legal Channel parameter and illegal channel parameter determine minimal characteristic vector；

Power computation module 13, if being less than or equal to peak power threshold for the corresponding transmit power of minimal characteristic vector Value, the power of transmitting terminal sending signal is determined according to minimal characteristic vector.

Determining module 12, specifically for：

Legal Q matrixes are calculated according to legitimate channel parameter, and

Illegal Q matrixes are calculated according to illegal channel parameter；

According to legal Q matrixes and illegal Q matrixes, minimal characteristic vector is determined.

Wherein, legal Q matrixes Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

Illegal Q matrixes Q_eCalculated by equation below：

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_e It is the autocorrelation matrix of channel disturbance and noise in illegal channel；

Minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

Wherein, minimal characteristic vector q_LCorresponding transmit power E is calculated by equation below：

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is minimum The transposition of characteristic vector.

The device of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 1, its realization principle and skill Art effect is similar to, and here is omitted.

Embodiment seven

On the basis of embodiment six, in the data transmission device of the embodiment of the present invention, power computation module 13 is additionally operable to：

If the corresponding transmit power of minimal characteristic vector is more than maximum power threshold, according to Caro need-Ku En-Plutarch KKT Dichotomy in condition determines the power of transmitting terminal sending signal.

Power computation module 13 specifically for：

KKT conditions are calculated by equation below：

When following condition is met, stop calculating,

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

Corresponding transmit power is the power of transmitting terminal sending signal.

The device of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 2, its realization principle and skill Art effect is similar to, and here is omitted.

Embodiment eight

On the basis of embodiment six, in the data transmission device of the embodiment of the present invention, determining module 12 is additionally operable to：

If channel parameter only includes legitimate channel parameter, according to legitimate channel parameter determination maximal eigenvector；

Power computation module 13, is additionally operable to：

If the corresponding transmit power of maximal eigenvector is less than or equal to maximum power threshold, according to maximal eigenvector Determine the power of transmitting terminal sending signal.

Power computation module, specifically for：

Legal Q matrixes are calculated according to legitimate channel parameter；

Legal Q matrixes Q_bCalculated by equation below：

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor The autocorrelation matrix of channel disturbance and noise in legitimate channel；

Maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

Maximal eigenvector q₁Corresponding transmit power E is calculated by equation below：

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,It is minimum The transposition of characteristic vector.

The device of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 3, its realization principle and skill Art effect is similar to, and here is omitted.

Embodiment nine

On the basis of embodiment eight, in the data transmission device of the embodiment of the present invention, power computation module 13 is also used In：

If the corresponding transmit power of maximal eigenvector is more than maximum power threshold, transmitting terminal not sending signal.

The device of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 4, its realization principle and skill Art effect is similar to, and here is omitted.

Embodiment ten

Fig. 9 is the structural representation of data transmission device embodiment five provided in an embodiment of the present invention, as shown in figure 9, On the basis of embodiment eight, in the data transmission device of the embodiment of the present invention, also include：Add module 14.

Add module 14, for adding man made noise, man made noise not to be produced to legal receiving terminal dry in sending signal Disturb.

The device of the present embodiment, can be used for performing the technical scheme of embodiment of the method shown in Fig. 5, its realization principle and skill Art effect is similar to, and here is omitted.

Device embodiment described above is only schematical, wherein can be as the unit that separating component is illustrated Or may not be physically separate, the part shown as unit can be or may not be physical location, i.e., A place is may be located at, or can also be distributed at least two NEs.It can according to the actual needs be selected In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness Work in the case of, you can to understand and implement.

Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology The scope of scheme.

Claims (22)

1. a kind of data transmission method, it is characterised in that including：

Transmitting terminal estimates channel parameter according to the pilot signal for receiving；

If the channel parameter includes legitimate channel parameter and illegal channel parameter simultaneously, the transmitting terminal is according to the legal letter Road parameter and the illegal channel parameter determine minimal characteristic vector；

If the vectorial corresponding transmit power of the minimal characteristic is less than or equal to maximum power threshold, according to the minimal characteristic Vector determines the power of the transmitting terminal sending signal.

2. method according to claim 1, it is characterised in that methods described also includes：

If the vectorial corresponding transmit power of the minimal characteristic is more than maximum power threshold, according to Caro need-Ku En-Plutarch Dichotomy in KKT conditions determines the power of transmitting terminal sending signal.

3. method according to claim 1 and 2, it is characterised in that the transmitting terminal according to the legitimate channel parameter with And the illegal channel parameter determines minimal characteristic vector, including：

The transmitting terminal calculates legal Q matrixes according to the legitimate channel parameter, and

The transmitting terminal calculates illegal Q matrixes according to the illegal channel parameter；

According to the legal Q matrixes and the illegal Q matrixes, minimal characteristic vector is determined.

4. method according to claim 3, it is characterised in that

The legal Q matrixes Q_bCalculated by equation below：

$Q_b=H_b^H{R}_b{H}_b$

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor legal The autocorrelation matrix of channel disturbance and noise in channel；

The illegal Q matrixes Q_eCalculated by equation below：

$Q_e=H_e^H{R}_e{H}_e$

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_eFor illegal The autocorrelation matrix of channel disturbance and noise in channel；

The minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

5. method according to claim 1, it is characterised in that the minimal characteristic vector q_LCorresponding transmit power E passes through Equation below is calculated：

$E=\frac{\mathrm{\γ}}{q_L^H{Q}_b{q}_L}$

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,For minimal characteristic to The transposition of amount.

6. method according to claim 3, it is characterised in that according to two points in Caro need-Ku En-Plutarch KKT conditions Method determines the power of transmitting terminal sending signal, including：

The KKT conditions are calculated by equation below：

$\left(\right(1-\widetilde{\mathrm{\μ}})Q_e+\widetilde{\mathrm{\μ}}I)s=\mathrm{\β}(1-\widetilde{\mathrm{\μ}})Q_{b}s,\mathrm{\β}>0$

When following condition is met, stop calculating,

$|q_L^H\left({\widetilde{\mathrm{\&mu;}}}^{opt}\right)Q_b{q}_L\left({\widetilde{\mathrm{\&mu;}}}^{opt}\right)-\mathrm{\&gamma;}/E_{max}|<\&Element;$

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

It is describedCorresponding transmit power is the power of the transmitting terminal sending signal.

7. method according to claim 1, it is characterised in that methods described also includes：

If the channel parameter only includes legitimate channel parameter, the transmitting terminal is maximum special according to the legitimate channel parameter determination Levy vector；

If the corresponding transmit power of the maximal eigenvector is less than or equal to maximum power threshold, according to the maximum Characteristic vector determines the power of the transmitting terminal sending signal.

8. method according to claim 7, it is characterised in that methods described also includes：

If the corresponding transmit power of the maximal eigenvector is more than maximum power threshold, the transmitting terminal not sending signal.

9. method according to claim 7, it is characterised in that methods described also includes：

Man made noise, the man made noise is added not to produce interference to the legitimate receipt end in the sending signal.

10. method according to claim 7, it is characterised in that the transmitting terminal is according to the legitimate channel parameter determination Maximal eigenvector, including：

The transmitting terminal calculates legal Q matrixes according to the legitimate channel parameter；

The legal Q matrixes Q_bCalculated by equation below：

$Q_b=H_b^H{R}_b{H}_b$

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor legal The autocorrelation matrix of channel disturbance and noise in channel；

The maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

11. methods according to claim 10, it is characterised in that the maximal eigenvector q₁Corresponding transmit power E leads to Equation below is crossed to be calculated：

$E=\frac{\mathrm{\&gamma;}}{q_1^H{Q}_b{q}_1}$

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,For maximum feature to The transposition of amount.

A kind of 12. data transmission devices, it is characterised in that including：

Parameter calculating module, for estimating channel parameter according to the pilot signal for receiving；

Determining module, if including legitimate channel parameter and illegal channel parameter simultaneously for the channel parameter, according to the conjunction Method channel parameter and the illegal channel parameter determine minimal characteristic vector；

Power computation module, if being less than or equal to peak power threshold for the corresponding transmit power of minimal characteristic vector Value, the power of the transmitting terminal sending signal is determined according to minimal characteristic vector.

13. devices according to claim 12, it is characterised in that the power computation module is additionally operable to：

If the vectorial corresponding transmit power of the minimal characteristic is more than maximum power threshold, according to Caro need-Ku En-Plutarch Dichotomy in KKT conditions determines the power of transmitting terminal sending signal.

14. device according to claim 12 or 13, it is characterised in that the determining module, specifically for：

Legal Q matrixes are calculated according to the legitimate channel parameter, and

Illegal Q matrixes are calculated according to the illegal channel parameter；

According to the legal Q matrixes and the illegal Q matrixes, minimal characteristic vector is determined.

15. devices according to claim 14, it is characterised in that the legal Q matrixes Q_bCounted by equation below Calculate：

$Q_b=H_b^H{R}_b{H}_b$

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor legal The autocorrelation matrix of channel disturbance and noise in channel；

The illegal Q matrixes Q_eCalculated by equation below：

$Q_e=H_e^H{R}_e{H}_e$

Wherein, H_eIt is the multi-path information matrix of illegal channel,It is the transposition of the multi-path information matrix of illegal channel, R_eFor illegal The autocorrelation matrix of channel disturbance and noise in channel；

The minimal characteristic vector q_LIt is to matrix (Q_b, Q_e) decompose the minimal eigenvalue for obtaining.

16. devices according to claim 12, it is characterised in that the minimal characteristic vector q_LCorresponding transmit power E leads to Equation below is crossed to be calculated：

$E=\frac{\mathrm{\&gamma;}}{q_L^H{Q}_b{q}_L}$

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,For minimal characteristic to The transposition of amount.

17. devices according to claim 13, it is characterised in that the power computation module specifically for：

The KKT conditions are calculated by equation below：

$\left(\right(1-\widetilde{\mathrm{\&mu;}})Q_e+\widetilde{\mathrm{\&mu;}}I)s=\mathrm{\&beta;}(1-\widetilde{\mathrm{\&mu;}})Q_{b}s,\mathrm{\&beta;}>0$

When following condition is met, stop calculating,

$|q_L^H\left({\widetilde{\mathrm{\&mu;}}}^{opt}\right)Q_b{q}_L\left({\widetilde{\mathrm{\&mu;}}}^{opt}\right)-\mathrm{\&gamma;}/E_{max}|<\&Element;$

Wherein, Q_bIt is the Q matrixes of legitimate channel, Q_eIt is the Q matrixes of illegal channel,I is unit matrix；

S is frequency spreading wave,It is matrixMiddle minimal characteristic vector,

β isCorresponding value, E_maxIt is maximum power threshold, ∈ is precision threshold；

It is describedCorresponding transmit power is the power of the transmitting terminal sending signal.

18. devices according to claim 12, it is characterised in that the determining module, are additionally operable to：

If the channel parameter only includes legitimate channel parameter, according to the legitimate channel parameter determination maximal eigenvector；

The power computation module, is additionally operable to：

If the corresponding transmit power of the maximal eigenvector is less than or equal to maximum power threshold, according to the maximum Characteristic vector determines the power of the transmitting terminal sending signal.

19. devices according to claim 18, it is characterised in that the power computation module, are additionally operable to：

If the corresponding transmit power of the maximal eigenvector is more than maximum power threshold, the transmitting terminal not sending signal.

20. devices according to claim 18, it is characterised in that described device also includes：

Add module, for adding man made noise in the sending signal, the man made noise to the legitimate receipt end not Produce interference.

21. devices according to claim 18, it is characterised in that the power computation module, specifically for：

Legal Q matrixes are calculated according to the legitimate channel parameter；

The legal Q matrixes Q_bCalculated by equation below：

$Q_b=H_b^H{R}_b{H}_b$

Wherein, H_bIt is the multi-path information matrix of legitimate channel,It is the transposition of the multi-path information matrix of legitimate channel, R_bFor legal The autocorrelation matrix of channel disturbance and noise in channel；

The maximal eigenvector q₁It is to matrix Q_bThe maximum that decomposition is obtained.

22. devices according to claim 21, it is characterised in that the maximal eigenvector q₁Corresponding transmit power E leads to Equation below is crossed to be calculated：

$E=\frac{\mathrm{\&gamma;}}{q_1^H{Q}_b{q}_1}$

Wherein, γ is the communication quality standard QOS threshold values of legitimate channel, Q_bIt is the Q matrixes of legitimate channel,For minimal characteristic to The transposition of amount.