CN103475441B - In wireless multi-hop network based on bunch cooperation interference transmission method - Google Patents

Abstract

The invention provides in a kind of wireless multi-hop network based on bunch cooperation interference transmission method, including: the first transmission stage: bunch bunch head that sends in described wireless multi-hop network sends information to via node selected in transmission bunch bunch, and by the first group of interfering nodes selected, listener-in is disturbed; The second transmission stage: described information is sent the reception bunch bunch head to described wireless multi-hop network by described via node, and by the second group of interfering nodes selected, described listener-in is disturbed. By adopt in wireless multi-hop network provided by the present invention based on bunch cooperation interference transmission method, the relay node cooperation transmission information of optimum can be chosen, and the interfering nodes interference listener-in of optimum can be chosen, thus making the safety information speed in transmitting procedure maximize under certain transmit power, improve the security performance of whole network.

Description

In wireless multi-hop network based on bunch cooperation interference transmission method

Technical field

The present invention relates to wireless network communication technique, particularly in wireless multi-hop network based on bunch cooperation interference transmission method.

Background technology

Wireless multi-hop network has become as the focus of a research in wireless network communication technique at present, and along with the development of wireless multi-hop network, its range of application is also more and more wider. Nearest achievement in research shows, utilizes via node to carry out cooperation transmission and can be effectively improved communication quality, provide the performance of wireless multi-hop network in wireless multi-hop network. But, utilize via node to carry out cooperation transmission and may bring the safety problem of communication, for instance, in sending bunch bunch, receive bunch bunch in or bunch between node in would be likely to occur the information that wireless multi-hop network transmits by listener-in and eavesdrop.

The scheme of existing guarantee wireless multi-hop network communication security generally all combines with other technologies, such as, the safety of data transmission is improved by the encryption technology on upper strata, so often make whole scheme complex, and, rarely having scheme can solve the problem that in prior art utilizes relay node cooperation to transmit the safety problem brought in wireless multi-hop network, in particular, there is no the scheme for utilizing cooperation transmission interference listener-in in wireless multi-hop network in prior art.

Summary of the invention

(1) to solve the technical problem that

The technical problem to be solved be in wireless multi-hop network based on bunch cooperation transmission in information security issue.

(2) technical scheme

For this purpose, the present invention propose in a kind of wireless multi-hop network based on bunch cooperation interference transmission method, including: the first transmission stage: bunch bunch head that sends in described wireless multi-hop network sends information to via node selected in transmission bunch bunch, and by the first group of interfering nodes selected, listener-in is disturbed; The second transmission stage: described information is sent the reception bunch bunch head to described wireless multi-hop network by described via node, and by the second group of interfering nodes selected, described listener-in is disturbed.

In the above-mentioned methods, described first group of interfering nodes includes: to send bunch bunch in listener-in disturb send bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes; Described second group of interfering nodes includes: to send bunch bunch in listener-in disturb send bunch bunch internal interference node, to receive bunch bunch in listener-in disturb receive bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes.

Preferably, in the described second transmission stage, described via node adopts the mode that decoding forwards to send described information to described reception bunch bunch head, and the information rate of described via node is not less than the information rate of described reception bunch bunch head.

Preferably, described listener-in is carried out interference and includes by described first group of interfering nodes and described second group of interfering nodes: described first group of interfering nodes and described second group of interfering nodes send default interference signal to described listener-in.

Preferably, before the described first transmission stage, described default interference signal is informed described via node and described reception bunch bunch head so that described via node and described reception bunch bunch head eliminate the impact of described interference signal in described first transmission stage and the second transmission stage.

Preferably, described listener-in is carried out interference and includes by described first group of interfering nodes and described second group of interfering nodes: make described first group of interfering nodes and described second group of interfering nodes orientation send interference signal to described listener-in.

Preferably, the step selecting described via node, described first group of interfering nodes and described second group of interfering nodes includes: list all can as the combination of nodes of described via node, described first group of interfering nodes and described second group of interfering nodes; Based on listed each group node combination, under certain transmit power, calculate safety information speed and the safety information speed in described second transmission stage in described first transmission stage; Select to make first group of interfering nodes in the maximized combination of nodes of safety information speed in described first transmission stage as described first group of selected interfering nodes, select to make second group of interfering nodes in the maximized combination of nodes of safety information speed in described second transmission stage as described second group of selected interfering nodes, select to make the via node in the maximized combination of nodes of smaller in the safety information speed in described first transmission stage and the safety information speed in described second transmission stage as described selected via node.

Preferably, difference between the greater of listener-in's maximum information speed between listener-in and described bunch in the described first transmission maximum information speed that safety information speed is via node described in the described first transmission stage in stage and described transmission bunch bunch, the safety information speed in described second transmission stage be receive listener-in in the maximum information speed of bunch bunch head and described transmission bunch bunch described in the described second transmission stage, difference between the maximum of listener-in's maximum information speed in listener-in and described reception bunch bunch between described bunch.

Preferably, the step selecting described via node, described first group of interfering nodes and described second group of interfering nodes also includes: obtain the power distribution weights of described via node, described first group of interfering nodes and described second group of interfering nodes.

(3) beneficial effect

In wireless multi-hop network provided by the present invention based on bunch cooperation interference transmission method can choose the via node of optimum and first and second groups of interfering nodes so that safety information speed in transmitting procedure maximizes. The present invention has filled up and there is no the blank utilizing relay node cooperation to transmit the technical scheme disturbing listener-in in wireless multi-hop network in prior art, when making to utilize relay node cooperation to transmit in wireless multi-hop network, it is no longer necessary to the other technologies such as combining encryption technology can ensure the safety that information is transmitted simultaneously.

Accompanying drawing explanation

Fig. 1 be in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method schematic diagram;

Fig. 2 be in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method flow chart;

Fig. 3 A be in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method first transmission the stage schematic diagram;

Fig. 3 B be in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method second transmission the stage schematic diagram;

Fig. 4 is via node according to embodiments of the present invention and each interfering nodes chooses flow chart;

Fig. 5 is the simulation comparison figure of the security interrupt probability with transmission method of the prior art of the transmission method according to embodiments of the present invention and transmit power;

Fig. 6 is the simulation comparison figure of the security interrupt probability with transmission method of the prior art of the transmission method according to embodiments of the present invention and both candidate nodes.

Detailed description of the invention

Fig. 1 illustrate in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method schematic diagram. As shown in Figure 1, S, D respectively source node and destination node, both are apart from each other, require over intermediate node to assist to communicate, these intermediate nodes form via node, transmitted information to next bunch by the node in same cluster, by relaying bunch, information is transmitted to destination node D by source node S with this. In sending bunch bunch, receive bunch bunch in and send bunch and receive bunch bunch between there is listener-in transmitting procedure eavesdropped, in order to ensure the safety of communication process, by listener-in being sent interference signal to suppress it to eavesdrop. Owing to the data transmission procedure between each group of transmission bunch with reception bunch is similar, therefore by the data transmission procedure of one group of transmission bunch and reception bunch, the method can be described.

Fig. 2 illustrate in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method flow chart. As in figure 2 it is shown, this transmission method may include that

The first transmission stage: send bunch bunch head and send information to via node selected in transmission bunch bunch, and by the first group of interfering nodes selected, listener-in is disturbed;

The second transmission stage: described via node is preferably with DF(Decode-and-Forward, and decoding forwards) mode send information to receive bunch bunch head, and by the second group of interfering nodes selected, listener-in is disturbed.

Fig. 3 A and 3B respectively illustrate in wireless multi-hop network according to embodiments of the present invention based on bunch cooperation interference transmission method first and second transmission the stages schematic diagram.

As shown in Figure 3A, in the first transmission stage, send a bunch bunch head and send information to via node, in this course, in sending bunch bunch listener-in and bunch between listener-in's (can ignore receive bunch bunch in the impact of listener-in) information can be eavesdropped, it is necessary to select first group of interfering nodes that above-mentioned listener-in is disturbed.For send bunch bunch in listener-in, it is possible to send bunch bunch in select suitable interfering nodes that it is disturbed, for bunch between listener-in, it is possible to send bunch and receive bunch bunch in select suitable interfering nodes that it is disturbed. What namely first group of interfering nodes included listener-in in sending bunch bunch is disturbed send bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes.

As shown in Figure 3 B, in the second transmission stage, via node sends information to receive bunch bunch head, in this course, send bunch bunch in listener-in, bunch between listener-in and receive bunch bunch in listener-in all information can be eavesdropped, it is necessary to select second group of interfering nodes that above-mentioned listener-in is disturbed. For listener-in in transmission bunch bunch, can select suitable interfering nodes that it is disturbed in transmission bunch bunch, for listener-in in reception bunch bunch, can select suitable interfering nodes that it is disturbed in reception bunch bunch, for bunch between listener-in, it is possible to send bunch or receive bunch bunch in select suitable interfering nodes that it is disturbed. What namely second group of interfering nodes included listener-in in sending bunch bunch is disturbed send bunch bunch internal interference node, listener-in in receiving bunch bunch is disturbed receive bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes.

In order to ensure the safety of transmitting procedure, it is necessary to send bunch in select optimum via node, be simultaneous for each listener-in send bunch or receive bunch in choose optimum interfering nodes listener-in is disturbed accordingly. Hereinafter, it will the choosing method of detailed description via node and interfering nodes.

Fig. 4 illustrates that the via node according to the present embodiment and each interfering nodes choose flow chart. As shown in Figure 4, the via node in the first transmission stage and the second transmission stage and the choosing method of each interfering nodes are as follows:

S41: list all can as the combination of nodes of via node, first group of interfering nodes and second group of interfering nodes;

S42: based on listed each group node combination, calculate safety information speed and the safety information speed in the second transmission stage in the first transmission stage;

S43: select to make first group of interfering nodes in the maximized combination of nodes of safety information speed in the first transmission stage as first group of optimum interfering nodes, select to make second group of interfering nodes in the maximized combination of nodes of safety information speed in the second transmission stage as second group of optimum interfering nodes, select to make the via node in the maximized combination of nodes of smaller in the safety information speed in the safety information speed in the first transmission stage and the second transmission stage as optimum via node. Wherein, difference between the greater of listener-in's maximum information speed between listener-in and described bunch in the described first transmission maximum information speed that safety information speed is via node described in the described first transmission stage in stage and described transmission bunch bunch, the safety information speed in described second transmission stage be receive listener-in in the maximum information speed of bunch bunch head and described transmission bunch bunch described in the described second transmission stage, difference between the maximum of listener-in's maximum information speed in listener-in and described reception bunch bunch between described bunch.

According to, in the transmission method of the present embodiment, setting the general power of whole transmitting procedure, while continue in selecting node and first and second groups of interfering nodes, it is thus achieved that the power distribution weights of via node and first and second groups of interfering nodes.Afterwards, via node and first and second groups of interfering nodes distribute weights according to its power and transmit accordingly. Specifically, it is possible to set total transmit power in whole transmission stage as P₀, in the first transmission stage, total transmit power of each node is P⁽¹⁾, in the second transmission stage, total transmit power of each node is P⁽²⁾, wherein, P⁽¹⁾+P⁽²⁾=P₀��

1) the first transmission stage:

Can set that the transmit power sending bunch bunch head is P_HT; Can set that the transmit power sum of all transmission bunch bunch internal interference nodes isAnd useRepresent the weights allocation vector sending bunch bunch internal interference node set; Can set that the transmit power sum of interfering nodes between all bunches isAnd useThe weights allocation vector of interfering nodes set between expression bunch; Can set that be positioned at send bunch bunch bunch between the transmit power sum of interfering nodes beAnd useRepresent the weights allocation vector of this node set. Wherein,For conjugate transpose operator, the transmit power sum of each node is total transmit power in the first transmission stage, it may be assumed that

WithRepresent bunch information that bunch hair send of transmission,Represent the interference signal preset.

The signal that via node receives is:

Wherein, n_RFor the noise that via node receives, n_RGaussian distributed CN��(0, ��²), h_HTRRepresent and send bunch bunch head H_TWith the channel gain of via node,WithRepresent respectively send bunch bunch internal interference node set and bunch between the channel gains vector of interfering nodes and via node.

It should be noted that before the first transmission stage, in advance default interference signal can be informed via node and receives bunch bunch head, in order to via node and reception bunch bunch head can eliminate the impact of interference signal in the first and second transmission stages; Or, it is also possible to by wireless directional transmissions technology, making first and second groups of interfering nodes directionally send interference signal to corresponding listener-in, continuing the impact of node thus directly avoiding interference signal pair. Therefore, according to shannon formula, it is possible to the maximum information speed obtaining via node is:

$R_R=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_R)=\frac{1}{2}{\log }_2(1+\frac{P_{\mathrm{HT}}{\left|h_{\mathrm{HTR}}\right|}^2}{{\mathrm{\σ}}^2})$

Wherein, ��_RIt it is the signal to noise ratio at via node place.

Sending bunch bunch signal that the �� interior listener-in receives is:

Wherein,Represent additive white Gaussian noise and Gaussian distributed CN��(0, �� of this listener-in²), h_HTea[��] represents transmission bunch bunch head H_TWith the channel gain of this listener-in, expressionDisturb the channel gains vector sending bunch bunch internal interference node and this listener-in of this listener-in,Represent the power distribution weights sending bunch bunch internal interference node disturbing this listener-in.

The maximum information speed that can obtain sending bunch bunch �� interior listener-in is:

$R_{\mathrm{ea}}^{T\left(1\right)}\left[\mathrm{\θ}\right]=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{ea}}^{T\left(1\right)}[\mathrm{\θ}\left]\right)=\frac{1}{2}{\log }_2(1+\frac{P_{\mathrm{HT}}\left|h_{\mathrm{HTea}}\right[\mathrm{\θ}]{|}^2}{P_{\mathrm{ja}}^{T\left(1\right)}{\left|w_{\mathrm{ja}}^{T\left(1\right)}\right[\mathrm{\θ}\left]h_{\mathrm{jaea}}^{T\left(1\right)}\right[\mathrm{\θ}\left]\right|}^2+{\mathrm{\σ}}^2})$

Wherein,It it is the signal to noise ratio at this listener-in place.

The signal that between �� bunch, listener-in receives is:

Wherein,Represent additive white Gaussian noise and Gaussian distributed CN��(0, �� that this listener-in locates²), h_HTer[��] andRepresent respectively and send bunch bunch head H_TAnd the channel gain of this listener-in and disturb this listener-in bunch between the channel gain of interfering nodes and this listener-in,Represent disturb this listener-in bunch between interfering nodes power distribution weights.

Can obtain the maximum information speed of listener-in between �� bunch is:

$R_{\mathrm{er}}^{\left(1\right)}\left[\mathrm{\ϵ}\right]=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{er}}^{\left(1\right)}[\mathrm{\ϵ}\left]\right)=\frac{1}{2}{\log }_2(1+\frac{P_{\mathrm{HT}}{\left|h_{\mathrm{HTer}}\right[\mathrm{\ϵ}\left]\right|}^2}{P_{\mathrm{jr}}^{\left(1\right)}{\left|w_{\mathrm{jr}}^{\left(1\right)}\right[\mathrm{\ϵ}\left]h_{\mathrm{jrer}}^{\left(1\right)}\right[\mathrm{\ϵ}\left]\right|}^2+{\mathrm{\σ}}^2})$

Wherein,It it is the signal to noise ratio at listener-in place between this bunch.

2) the second transmission stage:

In order to improve the performance of whole transmission network, via node is receiving transmission bunch bunch head H_TAfter the information sent, it is preferable that information information received by via node in the way of decoding forwarding sends to receiving bunch bunch head. In order to enable via node to be correctly decoded, it is necessary to the information rate of via node is not less than reception bunch bunch head H_RInformation rate, it may be assumed that

P_HT|h_HTR|²��P_R|h_RHR|²

Can set that the transmit power of via node is P_R;Can set that the transmit power sum of all transmission bunch bunch internal interference nodes isAnd useRepresent the weights allocation vector sending bunch bunch internal interference node set; Can set that the transmit power sum of all reception bunch bunch internal interference nodes isAnd useRepresent the weights allocation vector receiving bunch bunch internal interference node set; Can set that the transmit power sum of interfering nodes between all bunches isAnd useThe weights allocation vector of interfering nodes set between expression bunch; Can set that be positioned at receive bunch bunch bunch between the transmit power sum of interfering nodes beAnd useRepresent the weights allocation vector of this node set. Wherein,For conjugate transpose operator, the transmit power sum of each node is total transmit power in the second transmission stage, it may be assumed that $P_R+P_{\mathrm{ja}}^{T\left(2\right)}+P_{\mathrm{ja}}^{R\left(2\right)}+P_{\mathrm{jr}}^{\left(2\right)}=P^{\left(2\right)}.$

In the second transmission stage, receive bunch bunch head H_RThe signal that place receives is:

Wherein, P_RIt is the transmit power of via node, n_HRRepresent additive white Gaussian noise Gaussian distributed CN��(0, �� receiving bunch bunch head place²), h_RHRRepresent via node and receive bunch bunch head H_RChannel gain,WithRepresent respectively and receive bunch bunch internal interference node set and receive bunch bunch head H_RAnd bunch between interfering nodes set with receive bunch bunch head H_RChannel gains vector.

Due to before the first transmission stage, in advance default interference signal informed to via node and received bunch bunch head, or make first and second groups of interfering nodes directionally send interference signal to corresponding listener-in already by wireless directional transmissions technology, thus eliminate interference signal to receiving bunch bunch head H_RImpact. Therefore, bunch bunch head H is received_RMaximum information speed be:

$R_{\mathrm{HR}}=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{HR}})=\frac{1}{2}{\log }_2(1+\frac{P_R{\left|h_{\mathrm{RHR}}\right|}^2}{{\mathrm{\σ}}^2})$

Wherein, ��_HRIt is receive bunch bunch head H_RThe signal to noise ratio at place.

Sending bunch bunch signal that the �� interior listener-in place receives is:

Wherein,It it is additive white Gaussian noise and Gaussian distributed CN��(0, �� at the �� listener-in place in transmission bunch bunch²),WithRepresent via node and this listener-in's channel gain, the channel gain sending bunch bunch internal interference node and this listener-in disturbing this listener-in respectively,Represent the power distribution weights sending bunch bunch internal interference node disturbing this listener-in.

In transmission bunch bunch, the maximum information speed at the �� listener-in place is:

$R_{\mathrm{ea}}^{T\left(2\right)}\left[\mathrm{\ι}\right]=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{ea}}^{T\left(2\right)}[\mathrm{\ι}\left]\right)=\frac{1}{2}{\log }_2(1+\frac{P_R{\left|h_{\mathrm{Rea}}^T\right[\mathrm{\ι}\left]\right|}^2}{P_{\mathrm{ja}}^{T\left(2\right)}{\left|w_{\mathrm{ja}}^{T\left(2\right)}\right[\mathrm{\ι}\left]h_{\mathrm{jaea}}^{T\left(2\right)}\right[\mathrm{\ι}\left]\right|}^2+{\mathrm{\σ}}^2})$

Wherein,It it is the signal to noise ratio at this listener-in place.

The signal that in receiving bunch bunch, the �� listener-in receives is:

Wherein,Represent additive white Gaussian noise and Gaussian distributed CN��(0, �� at the �� listener-in place in reception bunch bunch²),Represent the channel gain of via node and this listener-in respectively, disturb the channel gain receiving bunch bunch internal interference node and �� listener-in of this listener-in,Represent the power distribution weights receiving bunch bunch internal interference node disturbing this listener-in.

In reception bunch bunch, the maximum information speed at the �� listener-in place is:

$R_{\mathrm{ea}}^{R\left(2\right)}\left[\mathrm{\υ}\right]=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{ea}}^{R\left(2\right)}[\mathrm{\υ}\left]\right)=\frac{1}{2}{\log }_2(1+\frac{P_R{\left|h_{\mathrm{Rea}}^R\right[\mathrm{\υ}\left]\right|}^2}{P_{\mathrm{ja}}^{R\left(2\right)}{\left|w_{\mathrm{ja}}^{R\left(2\right)}\right[\mathrm{\υ}\left]h_{\mathrm{jaea}}^{R\left(2\right)}\right[\mathrm{\υ}\left]\right|}^2+{\mathrm{\σ}}^2})$

Wherein,It it is the signal to noise ratio at this listener-in place.

The signal that between �� bunch, listener-in receives is:

Wherein,Represent additive white Gaussian noise and Gaussian distributed CN��(0, �� at listener-in place between �� bunch²),WithRepresent respectively via node and this listener-in channel gain, disturb this listener-in bunch between the channel gain of interfering nodes and this listener-in,Represent disturb this listener-in bunch between interfering nodes power distribution weights.

Between �� bunch, the maximum information speed at listener-in place is:

$R_{\mathrm{er}}^{\left(2\right)}\left[\mathrm{\κ}\right]=\frac{1}{2}{\log }_2(1+{\mathrm{\γ}}_{\mathrm{er}}^{\left(2\right)}[\mathrm{\κ}\left]\right)=\frac{P_R{\left|h_{\mathrm{Rer}}\right[\mathrm{\κ}\left]\right|}^2}{P_{\mathrm{jr}}^{\left(2\right)}{\left|w_{\mathrm{jr}}^2\right[\mathrm{\κ}\left]h_{\mathrm{jrer}}^{\left(2\right)}\right[\mathrm{\κ}\left]\right|}^2+{\mathrm{\σ}}^2}$

Wherein,For the signal to noise ratio that this listener-in locates.

Above the present invention first was transmitted in stage and the second transmission stage the signal received by each node and listener-in and maximum information speed has been described in detail. Pass through foregoing description, it is possible to obtain the safety information speed in the first transmission stage and the second transmission stage and be respectively as follows:

$R_S^{\left(1\right)}={[R_R-\underset{\mathrm{\θ},\mathrm{\ϵ}}{\max }\{R_{\mathrm{ea}}^{T\left(1\right)}\left[\mathrm{\θ}\right],R_{\mathrm{er}}^{\left(1\right)}\left[\mathrm{\ϵ}\right]\left\}\right]}^{+}$

$R_S^{\left(2\right)}={[R_{\mathrm{HR}}-\underset{\mathrm{\κ},\mathrm{\ι},\mathrm{\υ}}{\max }\{R_{\mathrm{er}}^{\left(2\right)}\left[\mathrm{\κ}\right],R_{\mathrm{ea}}^{T\left(2\right)}\left[\mathrm{\ι}\right]R_{\mathrm{ea}}^{R\left(2\right)}\left[\mathrm{\υ}\right]\left\}\right]}^{+}$

That is, first transmission the stage the maximum information speed that safety information speed is via node in the described first transmission stage and send bunch bunch in listener-in and bunch between listener-in's maximum information speed the greater between difference;Second transmission the stage safety information speed be in the second transmission stage receive bunch bunch head maximum information speed and send bunch bunch in listener-in, bunch between listener-in and receive bunch bunch in listener-in's maximum information speed the maximum between difference. Wherein, [x]⁺=max{0, x}, 1�ܦȡ�v, 1�ܦɡ�v, 1�ܦš�0,1�ܦʡ�0,1�ܦԡ�u, v is the quantity of listener-in in sending bunch, 0 be bunch between the quantity of listener-in, u is the quantity of listener-in in reception bunch,WithRepresent in the first transmission stage in each send bunch bunch the maximum information speed of listener-in between listener-in and each bunch respectively,WithRepresent respectively in the second transmission stage listener-in between each bunch, each send bunch bunch in listener-in and each receive bunch bunch in the maximum information speed of listener-in.

The safety information speed of complete transmission process byWithIn the less safety information speed of value determine, therefore, the safety information speed of complete transmission process is:

$R_S=\min \{R_S^{\left(1\right)},R_S^{\left(2\right)}\}$

In order to ensure the different service quality (QoS) requirement to communication security, safety information speed grade that can be corresponding to different service definitions, such as, common L grade can be defined, wherein, Tl represents corresponding to the fixing safety information speed corresponding to the l safety information speed grade, and fixing safety information speed raises along with safety information speed grade and increases, wherein 1��l��L.

In order to portray the security performance of whole system, we utilize security interrupt probability as evaluation criteria, and it is defined as P{R_S< T_l, namely work as R_SLess than T_lTime, it is determined that current transmission is unsatisfactory for the requirement of the l safety information speed grade, namely thinks that current transmission is in unsafe state.

Our target is to select relaying and the interfering nodes of optimum under certain transmit power so that the security interrupt probability of whole system is minimum, and namely optimization problem is:

Wherein,Represent probability, R^*Represent the optimum via node selected,Represent the optimum interfering nodes set selected. In order to improve based on bunch wireless multi-hop network in information transmission safety, it is necessary to the security interrupt probability making complete transmission process is minimum. Owing to it is considered that statistical probability, therefore maximization safety information speed R can be converted into by minimizing security interrupt probability problem_SProblem. Therefore, it can the combination of nodes listing all via nodes and first, second group of interfering nodes before transmission, calculate corresponding to each combination of nodesWithAnd select to makeFirst group of interfering nodes in maximum combination of nodes, as first group of optimum interfering nodes, selects to makeSecond group of interfering nodes in maximum combination of nodes, as second group of optimum interfering nodes, selects to make R_SThe maximum via node in combination of nodes is as optimum via node. Specifically, it is possible to selected via node and the interfering nodes of optimum by following formula:

$R^{*}=\arg \max \min \{R_S^{\left(1\right)},R_S^{\left(2\right)}\}$

$=\arg \max \min \{\frac{1+{\mathrm{\&gamma;}}_R}{1+{\mathrm{\&gamma;}}_{\mathrm{ea}}^{T\left(1\right)}\left[\mathrm{\&theta;}\right]},\frac{1+{\mathrm{\&gamma;}}_R}{1+{\mathrm{\&gamma;}}_{\mathrm{er}}^{\left(1\right)}\left[\mathrm{\&epsiv;}\right]},\frac{1+{\mathrm{\&gamma;}}_{\mathrm{HR}}}{1+{\mathrm{\&gamma;}}_{\mathrm{er}}^{\left(2\right)}\left[\mathrm{\&kappa;}\right]},\frac{1+{\mathrm{\&gamma;}}_{\mathrm{HR}}}{1+{\mathrm{\&gamma;}}_{\mathrm{ea}}^{T\left(2\right)}\left[\mathrm{\&iota;}\right]},\frac{1+{\mathrm{\&gamma;}}_{\mathrm{HR}}}{1+{\mathrm{\&gamma;}}_{\mathrm{ea}}^{R\left(2\right)}\left[\mathrm{\&upsi;}\right]}\}$

Wherein, R^*For via node,WithRespectively in the first transmission stage send bunch bunch internal interference node set and bunch between interfering nodes set,WithRespectively in the second transmission stage send bunch bunch internal interference node set, receive bunch bunch internal interference node set and bunch between interfering nodes set.

Having turned out above-mentioned optimization problem is convex optimization problem, there is many convex optimization methods to solve this class problem, for instance gradient method, interior point method etc., be not detailed herein in prior art.

When signal to noise ratio is much larger than 1, equation below can be obtained further:

$R^{*}=\arg \max \min \{\frac{{\left|h_{\mathrm{HTR}}\right|}^2}{{\left|h_{\mathrm{HTer}}\right[\mathrm{\&epsiv;}\left]\right|}^2},\frac{{\left|h_{\mathrm{HTR}}\right|}^2}{{\left|h_{\mathrm{HTea}}\right[\mathrm{\&theta;}\left]\right|}^2},\frac{{\left|h_{\mathrm{RHR}}\right|}^2}{{\left|h_{\mathrm{Rer}}\right[\mathrm{\&kappa;}\left]\right|}^2},\frac{{\left|h_{\mathrm{RHR}}\right|}^2}{{\left|h_{\mathrm{Rea}}^T\right[\mathrm{\&iota;}\left]\right|}^2},\frac{{\left|h_{\mathrm{RHR}}\right|}^2}{{\left|h_{\mathrm{Rea}}^R\right[\mathrm{\&upsi;}\left]\right|}^2}\}$

Wherein,Represent the first group node combination is disturbed listener-in between �� bunch bunch between interfering nodes,Represent in the first group node combination and disturb the transmission bunch bunch internal interference node of �� listener-in in transmission bunch bunch;Represent the second group node combination is disturbed listener-in between �� bunch bunch between interfering nodes,Represent in the second group node combination and disturb the transmission bunch bunch internal interference node of �� listener-in in transmission bunch bunch,Represent in the second group node combination and disturb the reception bunch bunch internal interference node of �� listener-in in reception bunch bunch.

As it has been described above, obtain the transmission bunch via node of optimum, first group of interfering nodes and second group of interfering nodes according to the present embodiment.

Separately below the security performance of the wireless multi-hop network based on method provided by the present invention (CB-ORJ), noiseless tradition relay selection (CS-NJ) scheme and noiseless optimization relay selection (OS-NJ) scheme is contrasted.

Fig. 5 is the simulation comparison figure of the security interrupt probability with transmission method of the prior art of the transmission method according to embodiments of the present invention and transmit power. The position in simulated environment, send bunch bunch head, receiving bunch bunch head and listener-in is fixed, and bunch in both candidate nodes random distribution (both candidate nodes each bunch interior is 6). In the simulation result shown in Fig. 5, compared for the security interrupt probability of three kinds of schemes and the transmit power P sending bunch bunch head_HTRelation, in simulation process, set total transmit power P of whole transmitting procedure₀=80dBW, and send bunch bunch head H_TTransmit power P_HTTransmit power P with via node_REqual. As it is shown in figure 5, in method provided by the present invention (CB-ORJ), security interrupt probability is with P_HTIncrease in being decreased obviously trend, the security interrupt probability of CS-NJ and OS-NJ strategy then after slightly declining namely close to saturated.

Fig. 6 is the simulation comparison figure of the security interrupt probability with transmission method of the prior art of the transmission method according to embodiments of the present invention and both candidate nodes. In simulated environment, the position sending bunch bunch head, reception bunch bunch head and listener-in is fixed, both candidate nodes random distribution in bunch. In simulation process, set total transmit power P of whole transmitting procedure₀=80dBW, P_HT=16dBW, P_R=P_HT. As shown in Figure 6, N be bunch in both candidate nodes number, along with bunch in both candidate nodes number N increase, the security interrupt probability of three kinds of schemes all reduces. Compared to other two schemes, in method provided by the present invention (CB-ORJ), security interrupt probability declines clearly. For CS-NJ and OS-NJ, due to the restriction of scheme itself so that security interrupt probability reduce degree less, when bunch in both candidate nodes number increase to certain value time, the security interrupt probability of both schemes no longer has significant change.

By above description, by adopt in wireless multi-hop network provided by the present invention based on bunch cooperation interference transmission method, the relay node cooperation transmission information of optimum can be chosen, and the interfering nodes interference listener-in of optimum can be chosen, thus making the safety information speed in transmitting procedure maximize under certain transmit power, improve the security performance of whole network.

Although being described in conjunction with the accompanying embodiments of the present invention, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such amendment and modification each fall within the scope being defined by the appended claims.

Claims (9)

1. in wireless multi-hop network based on bunch cooperation interference a transmission method, including:

The first transmission stage: bunch bunch head that sends in described wireless multi-hop network sends information to via node selected in transmission bunch bunch, and by the first group of interfering nodes selected, listener-in is disturbed;

The second transmission stage: described information is sent the reception bunch bunch head to described wireless multi-hop network by described via node, and by the second group of interfering nodes selected, described listener-in is disturbed;

Wherein, the step selecting described via node, described first group of interfering nodes and described second group of interfering nodes includes:

List all can as the combination of nodes of described via node, described first group of interfering nodes and described second group of interfering nodes;

Based on listed each group node combination, under certain transmit power, calculate safety information speed and the safety information speed in described second transmission stage in described first transmission stage;

Select to make first group of interfering nodes in the maximized combination of nodes of safety information speed in described first transmission stage as described first group of selected interfering nodes, select to make second group of interfering nodes in the maximized combination of nodes of safety information speed in described second transmission stage as described second group of selected interfering nodes, select to make the via node in the maximized combination of nodes of smaller in the safety information speed in described first transmission stage and the safety information speed in described second transmission stage as described selected via node.

2. method according to claim 1, wherein, described first group of interfering nodes includes: to send bunch bunch in listener-in disturb send bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes.

3. method according to claim 1, wherein, described second group of interfering nodes includes: to send bunch bunch in listener-in disturb send bunch bunch internal interference node, to receive bunch bunch in listener-in disturb receive bunch bunch internal interference node and to bunch between listener-in disturb bunch between interfering nodes.

4. method according to claim 1, wherein, in the described second transmission stage, described via node adopts the mode that decoding forwards to send described information to described reception bunch bunch head, and the information rate of described via node is not less than the information rate of described reception bunch bunch head.

5. method according to claim 1, wherein, described listener-in is carried out interference and includes by described first group of interfering nodes and described second group of interfering nodes: described first group of interfering nodes and described second group of interfering nodes send default interference signal to described listener-in.

6. method according to claim 5, also includes: before the described first transmission stage, described default interference signal is informed described via node and described reception bunch bunch head so that described via node and described reception bunch bunch head eliminate the impact of described interference signal in described first transmission stage and the second transmission stage.

7. method according to claim 1, wherein, described listener-in is carried out interference and includes by described first group of interfering nodes and described second group of interfering nodes: make described first group of interfering nodes and described second group of interfering nodes orientation send interference signal to described listener-in.

8. method according to claim 3, wherein, difference between the greater of listener-in's maximum information speed between listener-in and described bunch in the described first transmission maximum information speed that safety information speed is via node described in the described first transmission stage in stage and described transmission bunch bunch, the safety information speed in described second transmission stage be receive listener-in in the maximum information speed of bunch bunch head and described transmission bunch bunch described in the described second transmission stage, difference between the maximum of listener-in's maximum information speed in listener-in and described reception bunch bunch between described bunch.

9. the method according to any one of claim 1-7, wherein, selects the step of described via node, described first group of interfering nodes and described second group of interfering nodes also to include:

Obtain the power distribution weights of described via node, described first group of interfering nodes and described second group of interfering nodes.