CN103475441A - Cooperative interference transmission method based on clusters in wireless multi-hop network - Google Patents

Abstract

The invention provides a cooperative interference transmission method based on clusters in a wireless multi-hop network. The method includes a first transmission period: a cluster head of a sending cluster in the wireless multi-hop network sending information to relay nodes selected in the sending cluster and a selected first group of interference nodes interfering an eavesdropper; and a second transmission period: the relay nodes sending the information to a cluster head of a receiving cluster in the wireless multi-hop network and a selected second group of interference nodes interfering the eavesdropper. Through adoption of the cooperative interference transmission method based on the clusters in the wireless multi-hop network, optimal relay nodes can be selected for information cooperation transmission and optimal interference nodes can be selected to interfere the eavesdropper so that a safety information rate is maximized in a transmission process under a specific sending power and safety performance of the whole network is improved.

Description

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

Technical field

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

Background technology

Wireless multi-hop network has become 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, in wireless multi-hop network, utilizes via node to carry out the performance that cooperation transmission can effectively be improved communication quality, wireless multi-hop network is provided.Yet, utilize via node to carry out the safety problem that cooperation transmission may be brought communication, for example, in sending bunch bunch, receive bunch bunch in or bunch between node in may exist the listener-in to be eavesdropped the information of wireless multi-hop network transmission.

The scheme of existing assurance wireless multi-hop network communication security all combines with other technologies usually, for example, improve the fail safe of transfer of data by the encryption technology on upper strata, so often make whole scheme comparatively complicated, and, in prior art, rarely have scheme can solve in wireless multi-hop network and utilize relay node cooperation to transmit the safety problem of bringing, in particular, there is no in prior art for utilize cooperation transmission to disturb listener-in's scheme at wireless multi-hop network.

Summary of the invention

(1) technical problem that will solve

Technical problem to be solved by this invention be in wireless multi-hop network based on bunch cooperation transmission in information security issue.

(2) technical scheme

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

In said method, described first group of interfering nodes comprises: in the transmission that listener-in in sending bunch bunch is disturbed bunch bunch interfering nodes and to bunch between the listener-in disturbed bunch between interfering nodes; Described second group of interfering nodes comprises: in interfering nodes in the transmission that listener-in in sending bunch bunch is disturbed bunch bunch, reception that listener-in in receiving bunch bunch is disturbed bunch bunch interfering nodes and to bunch between the listener-in disturbed bunch between interfering nodes.

Preferably, in described the second transmit stage, the mode that described via node adopts decoding to forward is sent to described reception bunch bunch head by described information, and the information rate of described via node is not less than the information rate of described reception bunch bunch head.

Preferably, described first group of interfering nodes and described second group of interfering nodes disturb and comprise described listener-in: described first group of interfering nodes and described second group of interfering nodes send default interference signal to described listener-in.

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

Preferably, described first group of interfering nodes and described second group of interfering nodes disturb and comprise described listener-in: make described first group of interfering nodes and described second group of interfering nodes orientation send interference signal to described listener-in.

Preferably, select the step of described via node, described first group of interfering nodes and described second group of interfering nodes to comprise: to list all can combination as the node of described via node, described first group of interfering nodes and described second group of interfering nodes; Each group node combination based on listed, under certain transmitted power, calculate the security information speed of described the first transmit stage and the security information speed of described the second transmit stage; Selection makes first group of interfering nodes in the combination of the maximized node of the security information speed of described the first transmit stage as described first group of selected interfering nodes, selection makes second group of interfering nodes in the combination of the maximized node of the security information speed of described the second transmit stage as described second group of selected interfering nodes, selects to make via node in the maximized node combination of smaller in the security information speed of the security information speed of described the first transmit stage and described the second transmit stage as described selected via node.

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

Preferably, select the step of described via node, described first group of interfering nodes and described second group of interfering nodes also to comprise: the power division weights that obtain 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 disturb transmission method can choose optimum via node and first and second groups of interfering nodes, make the security information speed in transmitting procedure maximize.The present invention has filled up and there is no the blank of utilizing relay node cooperation to transmit to disturb listener-in's technical scheme in the prior art in wireless multi-hop network, make simultaneously and utilize relay node cooperation when transmission in wireless multi-hop network, no longer need the other technologies such as combining encryption technology can ensure the fail safe of communication.

The accompanying drawing explanation

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

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

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

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

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

Fig. 5 is according to the safe outage probability of the transmission method of the embodiment of the present invention and transmission method of the prior art and the simulation comparison figure of transmitted power;

Fig. 6 is according to the safe outage probability of the transmission method of the embodiment of the present invention and transmission method of the prior art and the simulation comparison figure of both candidate nodes.

Embodiment

Fig. 1 show according in the wireless multi-hop network of the embodiment of the present invention based on bunch cooperation disturb the schematic diagram of transmission method.As shown in Figure 1, S, D are respectively source node and destination node, both apart from each others, need to assist to communicate by intermediate node, these intermediate nodes form via node, by extremely next bunch of communication, with this, by relaying bunch, information is transferred to destination node D by source node S by the node in same cluster.In sending bunch bunch, receive bunch bunch in and send bunch with reception bunch bunch between exist the listener-in to be eavesdropped transmitting procedure, in order to guarantee the fail safe of communication process, by the listener-in being sent to interference signal to suppress its eavesdropping.Due to each group send bunch with receive bunch between data transmission procedure be similar, therefore can the method be described by one group of data transmission procedure that sends bunch and receive bunch.

Fig. 2 show according in the wireless multi-hop network of the embodiment of the present invention based on bunch cooperation disturb the flow chart of transmission method.As shown in Figure 2, this transmission method can comprise:

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

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

Fig. 3 A and 3B show respectively according in the wireless multi-hop network of the embodiment of the present invention based on bunch cooperation disturb the schematic diagram of the first and second transmit stages of transmission method.

As shown in Figure 3A, in the first transmit stage, send a bunch bunch head information is sent to via node, in this course, in sending bunch bunch the listener-in and bunch between listener-in's (can ignore the impact of listener-in in receiving bunch bunch) can be eavesdropped information, need to select first group of interfering nodes to be disturbed above-mentioned listener-in.For listener-in in sending bunch bunch, can in sending bunch bunch, select suitable interfering nodes to be disturbed it, for bunch between the listener-in, can in sending bunch and receive bunch bunch, select suitable interfering nodes to be disturbed it.First group of interfering nodes comprise interfering nodes in transmission that listener-in in sending bunch bunch is disturbed bunch bunch and to bunch between the listener-in disturbed bunch between interfering nodes.

As shown in Figure 3 B, in the second transmit stage, via node is sent to information to receive bunch bunch head, in this course, listener-in in sending bunch bunch, bunch between the listener-in and receive bunch bunch in the listener-in all can be eavesdropped information, need to select second group of interfering nodes to be disturbed above-mentioned listener-in.For listener-in in sending bunch bunch, can in sending bunch bunch, select suitable interfering nodes to be disturbed it, for listener-in in receiving bunch bunch, can in receiving bunch bunch, select suitable interfering nodes to be disturbed it, for bunch between the listener-in, can in sending bunch or receive bunch bunch, select suitable interfering nodes to be disturbed it.Second group of interfering nodes comprise interfering nodes in transmission that listener-in in sending bunch bunch is disturbed bunch bunch, in reception that listener-in in receiving bunch bunch is disturbed bunch bunch interfering nodes and to bunch between the listener-in disturbed bunch between interfering nodes.

In order to guarantee the fail safe of transmitting procedure, need in sending bunch, select optimum via node, choose optimum interfering nodes for each listener-in in sending bunch or receive bunch simultaneously the listener-in is disturbed accordingly.Hereinafter, will describe the choosing method of via node and interfering nodes in detail.

Fig. 4 shows according to the via node of the present embodiment and each interfering nodes and chooses flow chart.As shown in Figure 4, the choosing method of the via node in the first transmit stage and the second transmit stage and each interfering nodes is as follows:

S41: list all node combinations that can be used as via node, first group of interfering nodes and second group of interfering nodes;

S42: each the group node combination based on listed, calculate the security information speed of the first transmit stage and the security information speed of the second transmit stage;

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

In the transmission method according to the present embodiment, set the gross power of whole transmitting procedure, when selecting via node and first and second groups of interfering nodes, obtain the power division weights of via node and first and second groups of interfering nodes.Afterwards, via node and first and second groups of interfering nodes carry out respective transmissions according to its power division weights.Particularly, the total transmitted power that can set whole transmit stage is P ₀, in the first transmit stage, total transmitted power of each node is P ⁽¹⁾, in the second transmit stage, total transmitted power of each node is P ⁽²⁾, wherein, P ⁽¹⁾+ P ⁽²⁾=P ₀.

1) the first transmit stage:

Can set the transmitted power that sends bunch bunch head is P _hT; The transmitted power sum that can set interfering nodes in all transmissions bunch bunch is

and use

the weights allocation vector of interfering nodes set in mean sending bunch bunch; The transmitted power sum that can set interfering nodes between all bunches is

and use

the weights allocation vector of interfering nodes set between meaning bunch; Can set be positioned at send bunch bunch bunch between the transmitted power sum of interfering nodes be

and use

the weights allocation vector that means this node set.Wherein,

for the conjugate transpose operator, the transmitted power sum of each node is total transmitted power of the first transmit stage, that is:

With mean bunch information that bunch hair send that sends,

mean default interference signal.

The signal that via node receives is:

Wherein, n _rfor the noise that via node receives, n _rgaussian distributed CN～(0, σ ²), h _hTRmean to send a bunch bunch H _twith the channel gain of via node,

with

in mean sending respectively bunch bunch the interfering nodes set and bunch between the channel gain vector of interfering nodes and via node.

Via node and reception bunch bunch head it should be noted that, can before the first transmit stage, in advance default interference signal be informed to via node and receive bunch bunch head, so that can be eliminated the impact of interference signal in the first and second transmit stages; Perhaps, can also make first and second groups of interfering nodes directionally to corresponding listener-in, send interference signal by wireless directional transmissions technology, thereby directly avoid interference the continue impact of node of signal pair.Therefore, according to shannon formula, the maximum information speed that can obtain via node is;

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

Wherein, γ _rit is the signal to noise ratio at via node place.

In sending bunch bunch the

the signal that individual listener-in receives is:

Wherein,

the additive white Gaussian noise and Gaussian distributed CN～(0, the σ that mean this listener-in ²),

mean to send a bunch bunch H _twith this listener-in's channel gain, mean

disturb the channel gain vector of interfering nodes and this listener-in in this listener-in's transmission bunch bunch,

mean to disturb the power division weights of interfering nodes in this listener-in's transmission bunch bunch.

In can obtaining sending bunch bunch the

individual listener-in's maximum information speed is:

Wherein,

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

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

Wherein,

the additive white Gaussian noise and Gaussian distributed CN～(0, the σ that mean this listener-in place ²), h _hTer[ε] and

mean respectively to send a bunch bunch H _tand this listener-in's channel gain and disturb this listener-in bunch between interfering nodes and this listener-in's channel gain,

mean to disturb this listener-in bunch between the power division weights of interfering nodes.

The maximum information speed that can obtain listener-in between ε bunch is:

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

Wherein,

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

2) the second transmit stage:

In order to improve the performance of whole transmission network, via node is receiving a transmission bunch bunch H _tafter the information sent, the mode preferably information forwarded with decoding is sent to the information that via node was received to receive bunch bunch head.For via node can be correctly decoded, need the information rate of via node to be not less than a reception bunch bunch H _rinformation rate, that is:

P _HT|h _HTR| ²≥P _R|h _RHR| ²

The transmitted power that can set via node is P _r; The transmitted power sum that can set interfering nodes in all transmissions bunch bunch is and use

the weights allocation vector of interfering nodes set in mean sending bunch bunch; The transmitted power sum that can set interfering nodes in all receptions bunch bunch is and use the weights allocation vector of interfering nodes set in mean receiving bunch bunch; The transmitted power sum that can set interfering nodes between all bunches is

and use

the weights allocation vector of interfering nodes set between meaning bunch; Can set be positioned at receive bunch bunch bunch between the transmitted power sum of interfering nodes be

and use

the weights allocation vector that means this node set.Wherein,

for the conjugate transpose operator, the transmitted power sum of each node is total transmitted power of the second transmit stage, that is: $P_R+P_{\mathrm{ja}}^{T\left(2\right)}+P_{\mathrm{ja}}^{R\left(2\right)}+P_{\mathrm{jr}}^{\left(2\right)}=P^{\left(2\right)}.$

In the second transmit stage, receive a bunch bunch H _rthe signal that place receives is;

Wherein, P _rthe transmitted power of via node, n _hRthe additive white Gaussian noise Gaussian distributed CN at expression reception bunch bunch head place～(0, σ ²), h _rHRmean via node and receive a bunch bunch H _rchannel gain,

with

in mean receiving respectively bunch bunch the interfering nodes set with receive a bunch bunch H _rand bunch between the interfering nodes set with receive a bunch bunch H _rthe channel gain vector.

Due to before the first transmit stage, in advance default interference signal informed to via node and received bunch bunch head, perhaps by wireless directional transmissions technology, make first and second groups of interfering nodes directionally to corresponding listener-in, send interference signal, thereby eliminated interference signal to receiving a bunch bunch H _rimpact.Therefore, receive a bunch bunch H _rmaximum information speed be:

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

Wherein, γ _hRto receive a bunch bunch H _rthe signal to noise ratio at place.

The signal that ι listener-in in sending bunch bunch locates to receive is:

Wherein,

ι additive white Gaussian noise and Gaussian distributed CN～(0, the σ that the listener-in locates in sending bunch bunch ²),

with mean respectively via node and this listener-in's channel gain, disturb the channel gain of interfering nodes and this listener-in in this listener-in's transmission bunch bunch, mean to disturb the power division weights of interfering nodes in this listener-in's transmission bunch bunch.

The maximum information speed that in sending bunch bunch, ι listener-in locates is:

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

Wherein,

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

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

Wherein,

be illustrated in receive bunch bunch in υ additive white Gaussian noise and Gaussian distributed CN～(0, the σ that the listener-in locates ²),

mean respectively via node and this listener-in channel gain, disturb the channel gain of interfering nodes and υ listener-in in this listener-in's reception bunch bunch, mean to disturb the power division weights of interfering nodes in this listener-in's reception bunch bunch.

The maximum information speed that in receiving bunch bunch, υ listener-in locates is;

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

Wherein,

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

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

Wherein,

the additive white Gaussian noise and Gaussian distributed CN～(0, the σ that mean listener-in place between κ bunch ²), h _rer[κ] and

mean respectively via node and this listener-in channel gain, disturb this listener-in bunch between interfering nodes and this listener-in's channel gain,

mean to disturb this listener-in bunch between the power division weights of interfering nodes.

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

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

Wherein,

signal to noise ratio for this listener-in place.

Above signal and the maximum information speed received to each node and listener-in in the present invention's the first transmit stage and the second transmit stage have been described in detail.By foregoing description, the security information speed that can obtain the first transmit stage and the second transmit stage is respectively:

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

That is the maximum information speed that, the security information speed of the first transmit stage is via node in described the first transmit stage and send bunch bunch in the listener-in and bunch between poor between the greater of listener-in's maximum information speed; The security information speed of the second transmit stage be the maximum information speed that receives bunch bunch head in the second transmit stage with send bunch bunch in the listener-in, bunch between poor between the maximum of listener-in's maximum information speed in listener-in and reception bunch bunch.Wherein, [x] ⁺=max{0, x},

for the quantity of listener-in in sending bunch,

for bunch between listener-in's quantity,

for the quantity of listener-in in receiving bunch,

with

mean respectively in the first transmit stage each send bunch bunch in listener-in's maximum information speed between listener-in and each bunch,

with

mean respectively in the second transmit stage listener-in between each bunch, each send bunch bunch in listener-in and each receive bunch bunch in listener-in's maximum information speed.

The security information speed of complete transmission process by

with

in the less security information speed of value determine, therefore, the security information speed of complete transmission process is:

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

In order to guarantee the requirement of different service quality (QoS) to communication security, security information speed grade that can be corresponding to different service definitions, for example, can define a common L grade, wherein, Tl means corresponding to l the corresponding fixedly security information of security information speed grade speed, and fixedly security information speed raises along with the security information speed grade and increases, wherein 1≤l≤L.

In order to portray the security performance of whole system, we utilize safe outage probability as evaluation criteria, and it is defined as P{R _s<T _l, work as R _sbe less than T _lthe time, judge that current transmission does not meet the requirement of l security information speed grade, thinks that current transmission is in unsafe state.

Our target is to select optimum relaying and interfering nodes under certain transmitted power, makes the safe outage probability minimum of whole system, and optimization problem is:

Wherein,

mean probability, R ^*mean the optimum via node of selecting,,

mean the optimum interfering nodes set of selecting.For can improve based on bunch wireless multi-hop network in the fail safe of communication, need to make the safe outage probability minimum of complete transmission process.Be statistical probability due to what consider, therefore can be converted into maximization security information speed R by minimizing safe outage probability problem _sproblem.Therefore, can before transmission, list the node combination of all via nodes and first, second group interfering nodes, calculate each node and combine corresponding

with and select to make

first group of interfering nodes in maximum node combination, as first group of interfering nodes of optimum, selected to make

second group of interfering nodes in maximum node combination, as second group of interfering nodes of optimum, selects to make R _svia node in maximum node combination is as optimum via node.Particularly, can select optimum via node and interfering nodes by following formula:

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

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

Wherein, R ^*for via node, with be respectively in the first transmit stage send bunch bunch in the interfering nodes set and bunch between the interfering nodes set,

with

be respectively in the second transmit stage send bunch bunch in the interfering nodes set, receive bunch bunch in the interfering nodes set and bunch between the interfering nodes set.

Proved that above-mentioned optimization problem is protruding optimization problem, in prior art, existed many protruding optimization methods to solve this class problem, such as gradient method, interior point method etc., be not described in detail here.

Much larger than 1 the time, can further obtain following formula when signal to noise ratio:

Wherein, mean in the first group node combination to disturb listener-in between ε bunch bunch between interfering nodes,

mean in the first group node combination to disturb send bunch bunch in the

interfering nodes in individual listener-in's transmission bunch bunch;

mean in the second group node combination to disturb listener-in between κ bunch bunch between interfering nodes,

mean in the second group node combination to disturb interfering nodes in the transmission bunch bunch of ι listener-in in sending bunch bunch,

mean in the second group node combination to disturb interfering nodes in the reception bunch bunch of υ listener-in in receiving bunch bunch.

As mentioned above, optimum transmission bunch via node, first group of interfering nodes and second group of interfering nodes have been obtained according to the present embodiment.

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

Fig. 5 is according to the safe outage probability of the transmission method of the embodiment of the present invention and transmission method of the prior art and the simulation comparison figure of transmitted power.In simulated environment, transmission bunch bunch head,

The position that receives bunch bunch head and listener-in is fixed, and bunch in both candidate nodes random distribution (both candidate nodes in each bunch is 6).In the simulation result shown in Fig. 5, contrasted the safe outage probability and the transmitted power P that sends bunch bunch head of three kinds of schemes _hTrelation, in simulation process, set total transmitted power P of whole transmitting procedure ₀=80dBW, and the transmitted power P of a transmission bunch bunch HT _hTtransmitted power P with via node _requate.As shown in Figure 5, in method provided by the present invention (CB-ORJ), safe outage probability is with P _hTincrease be obvious downward trend, the safe outage probability of CS-NJ and OS-NJ strategy approaches saturated after slightly descending.

Fig. 6 is according to the safe outage probability of the transmission method of the embodiment of the present invention and transmission method of the prior art and the simulation comparison figure of both candidate nodes.In simulated environment, the position that sends bunch bunch head, reception bunch bunch head and listener-in is fixed, both candidate nodes random distribution in bunch.In simulation process, set total transmitted power P of whole transmitting procedure ₀=80dBW, P _hT=16dBW, P _r=P _hT.As shown in Figure 6, along with bunch in the both candidate nodes number increase, the safe outage probability of three kinds of schemes all reduces.Than other two schemes, in method provided by the present invention (CB-ORJ), safe outage probability descends very obvious.For CS-NJ and OS-NJ, due to the restriction of scheme itself, make safe outage probability reduce degree less, when bunch in both candidate nodes number while being increased to certain value, the safe outage probability of this two schemes no longer includes significant change.

Known by above description, by adopt in wireless multi-hop network provided by the present invention based on bunch cooperation disturb transmission method, can choose optimum relay node cooperation transmission information, and can choose optimum interfering nodes and disturb the listener-in, thereby the security information speed make transmitting procedure under certain transmitted power in maximizes, and has improved the security performance of whole network.

Although described by reference to the accompanying drawings 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, such modification and modification all fall into by within the claims limited range.

Claims (10)

1. In a wireless multi-hop network based on bunch cooperation disturb transmission method, comprising:

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

   The second transmit stage: described via node is sent to the reception bunch bunch head in described wireless multi-hop network by described information, and by second group of selected interfering nodes, described listener-in is disturbed.
2. 2. method according to claim 1, wherein, described first group of interfering nodes comprises: in the transmission that listener-in in sending bunch bunch is disturbed bunch bunch interfering nodes and to bunch between the listener-in disturbed bunch between interfering nodes.
3. 3. method according to claim 1, wherein, described second group of interfering nodes comprises: in interfering nodes in the transmission that listener-in in sending bunch bunch is disturbed bunch bunch, reception that listener-in in receiving bunch bunch is disturbed bunch bunch interfering nodes and to bunch between the listener-in disturbed bunch between interfering nodes.
4. 4. method according to claim 1, wherein, in described the second transmit stage, the mode that described via node adopts decoding to forward is sent to described reception bunch bunch head by described information, and the information rate of described via node is not less than the information rate of described reception bunch bunch head.
5. 5. method according to claim 1, wherein, described first group of interfering nodes and described second group of interfering nodes disturb and comprise described listener-in: described first group of interfering nodes and described second group of interfering nodes send default interference signal to described listener-in.
6. 6. method according to claim 5, also comprise: described default interference signal is informed to described via node and described reception bunch bunch head are so that described via node and described reception bunch bunch head is eliminated the impact of described interference signal in described the first transmit stage and the second transmit stage before described the first transmit stage.
7. 7. method according to claim 1, wherein, described first group of interfering nodes and described second group of interfering nodes disturb and comprise described listener-in: make described first group of interfering nodes and described second group of interfering nodes orientation send interference signal to described listener-in.
8. 8. according to the described method of any one in claim 1-7, wherein, select the step of described via node, described first group of interfering nodes and described second group of interfering nodes to comprise:

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

   Each group node combination based on listed, under certain transmitted power, calculate the security information speed of described the first transmit stage and the security information speed of described the second transmit stage;

   Selection makes first group of interfering nodes in the combination of the maximized node of the security information speed of described the first transmit stage as described first group of selected interfering nodes, selection makes second group of interfering nodes in the combination of the maximized node of the security information speed of described the second transmit stage as described second group of selected interfering nodes, selects to make via node in the maximized node combination of smaller in the security information speed of the security information speed of described the first transmit stage and described the second transmit stage as described selected via node.
9. 9. method according to claim 8, wherein, poor between the greater of listener-in's maximum information speed between listener-in and described bunch in the maximum information speed that the security information speed of described the first transmit stage is via node described in described the first transmit stage and described transmission bunch bunch, the security information speed of described the second transmit stage is to receive poor between the maximum of listener-in's maximum information speed in listener-in and described reception between listener-in in the maximum information speed of bunch bunch head and described transmission bunch bunch, described bunch bunch bunch described in described the second transmit stage.
10. 10. according to the described method of any one in claim 1-7, wherein, select the step of described via node, described first group of interfering nodes and described second group of interfering nodes also to comprise:

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

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