CN104936251A - Optimal power distribution based relay selection method and system of security cooperation - Google Patents

Abstract

The invention relates to an optimal power distribution based relay selection method and system of security cooperation. The method comprises the steps that S1) relay nodes which can decode source node signals successfully in a secure cooperation communication system are included in a relay node set theta; S2) the waveform parameter m<RD><(i)> of a link from a relay node i to a target node in the relay node set theta in a Nakagami-m channel, the waveform parameter M<RE><(i,j)> of the link from the relay node i to each eavesdropping node in the Nakagami-m channel, the average of the signal to noise ratio gamma<RD><(i)> of the link from the relay node i to the target node, the average power parameter omega<RE><(i,j)> of the link from the relay node i to each eavesdropping node in the Nakagami-m channel, and the noise power the square of sigma<RE><(i,j)> of each eavesdropping node are measured and calculated; and S3) a data forwarding relay node k is calculated and selected. The optimal power distribution based relay selection method of security cooperation is innovative and has application values, is suitable for communication scenes in which channels are not stable, and is suitable for different fading channels.

Description

A kind of security cooperation relay selection method based on optimal power allocation and system

Technical field

The present invention relates to mobile communication technology field, particularly relate to a kind of security cooperation relay selection method based on optimal power allocation and system.

Background technology

Although relay cooperative technology brings a lot of facility to human communication, the opening due to its propagation channel makes safe transmission problem also become more and more outstanding.The secret means of tradition take contemporary cryptology as theoretical foundation, are encrypted information by key and cryptographic algorithm.But cryptographic algorithm is not can not crack completely, as long as listener-in obtains abundant plaintext, just can adopt the method for exhaustive attack to break a code, secret key also may be revealed in addition, so this secure fashion encounters very large challenge.In contrast to this, physical layer information safe practice relies on the inherent characteristic of physical layer completely, as fading characteristic and the noise of channel, realizes secure communication, has higher reliability.

The research of the relay selection scheme of physically based deformation layer safe practice has attracted the concern of academia in recent years gradually, and existing related algorithm and scheme are designed and propose.Under the condition with secret restriction, such as utilize the opportunistic relay selection scheme that the instant messages of tapping channel or average information are set up, this kind of legal link of Scheme Choice is maximum with the ratio of the Instant SNR of eavesdropping link, or the Instant SNR of legal link that relaying maximum with the ratio of the signal to noise ratio variance of eavesdropping link carrys out forwarding information.Or with a relay selection scheme for interfering nodes, the program continues node in selecting to while forwarding source node identification, also selects an interfering nodes to send artificial interference specially, to reduce the communication quality of eavesdropping link.Relevant method also has many, although these schemes take into account the problem of safety of physical layer, they all not to consider under power limited that in situation, power division is on the impact of relay selection.Therefore, the security cooperation relay selection studied under optimal power allocation is very important.

Summary of the invention

Technical problem to be solved by this invention, provides a kind of security cooperation relay selection method based on optimal power allocation and system.

The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of security cooperation relay selection method based on optimal power allocation, comprises the following steps:

Step S1, includes the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, described security cooperation communication system adopts Nakagami-m channel, suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero;

Step S2, measures and calculates desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero;

Step S3, according to the result of calculation of step S2, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k be greater than zero integer and k≤M.

On the basis of technique scheme, the present invention can also do following improvement.

Further, in step S1, described eavesdropping node is other nodes except described source node, described via node and described destination node, described eavesdropping node does not receive the direct link signal from described source node, described eavesdropping node can only intercept the signal from described via node, and described source node, described destination node, described via node and described eavesdropping node all configure pilot channel.

Further, in step S3, calculate each described eavesdropping node corresponding wait select via node k _j, k _jwhat an expression jth eavesdropping node was corresponding waits to select via node; Wherein

$k_j=\underset{i\&Element;\mathrm{\&Theta;}}{\arg }\mathrm{Max}\left\{C_s^{(i,j)}\right\},$ And $C_s^{(i,j)}=<C_{\mathrm{RD}}^{\left(i\right)}>-<C_{\mathrm{RE}}^{(i,j)}>;$

$\begin{array}{c}<C_{\mathrm{RE}}^{(i,j)}>=B{\&Integral;}_0^{+\&Proportional;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}{m}_{\mathrm{RE}}^{{(i,j)}^{m_{\mathrm{RE}}^{(i,j)}}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{{2m}_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}})}^{{-m}_{\mathrm{RD}}^{\left(i\right)}-1}\\ \&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}){\mathrm{d\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ <C_{\mathrm{RD}}^{\left(i\right)}>=B{\&Integral;}_0^{+\&Proportional;}\left(\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}-1}}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

for the safe capacity of the via node i of a corresponding jth eavesdropping node, for via node i is to the capacity average of the link of destination node; for via node i is to the capacity average of the link of eavesdropping node j; B is the bandwidth of security cooperation communication system; Γ () is gamma function; for via node i is to the waveform parameter of link under Nakagami-m channel of destination node; for via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the signal to noise ratio of the link of destination node; for via node i is to the signal to noise ratio of the link of eavesdropping node j; for via node i is to the signal to noise ratio average of the link of destination node; for via node i is to the transmitting power of the link of destination node; for via node i limits to the average power of the link of destination node; for via node i is to the noise power of link at eavesdropping node j place of eavesdropping node j; for via node i is to the interruption thresholding of the link of destination node; by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Determine; for under Nakagami-m channel probability density function;

When described eavesdropping node is one, now R=1, j=1, what this eavesdropping node calculated was corresponding waits to select via node k ₁be described data retransmission via node k.

Further, when described eavesdropping node is multiple, namely during R>=2, calculate each described eavesdropping node corresponding wait select via node k _j;

When all eavesdropping nodes calculated corresponding in time selecting via node identical, then what all eavesdropping nodes were corresponding wait selects via node to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding in time selecting via node different, select to wait to select the via node that in via node, safe capacity is maximum to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding wait select to have part identical in via node in time selecting via node, ask identical wait to select the safe capacity of via node select the safe capacity of via node with value and not identical the waiting of residue, select described safe capacity with value or safe capacity value maximum treat that selection via node is described data retransmission via node k.

Further, in step S3, when relaying node i to the link of destination node snr value lower than interruption thresholding time, via node i stops transmission data.

The another kind of technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of security cooperation relay selection system based on optimal power allocation, comprises set of relay nodes and builds module, parameter calculating module and data retransmission via node computing module;

Described set of relay nodes builds module and is used for including the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, described security cooperation communication system adopts Nakagami-m channel, suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero;

Described parameter calculating module is used for measuring and calculating desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero;

Described data retransmission via node computing module is used for the result of calculation according to described parameter calculating module, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k be greater than zero integer and k≤M.

On the basis of technique scheme, the present invention can also do following improvement.

Further, described eavesdropping node is other nodes except described source node, described via node and described destination node, described eavesdropping node does not receive the direct link signal from described source node, described eavesdropping node can only intercept the signal from described via node, and described source node, described destination node, described via node and described eavesdropping node all configure pilot channel.

Further, calculate each described eavesdropping node corresponding wait select via node k _j, k _jwhat an expression jth eavesdropping node was corresponding waits to select via node; Wherein

$k_j=\underset{i\&Element;\mathrm{\&Theta;}}{\arg }\mathrm{Max}\left\{C_s^{(i,j)}\right\},$ And $C_s^{(i,j)}=<C_{\mathrm{RD}}^{\left(i\right)}>-<C_{\mathrm{RE}}^{(i,j)}>;$

$\begin{array}{c}<C_{\mathrm{RE}}^{(i,j)}>=B{\&Integral;}_0^{+\&Proportional;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}{m}_{\mathrm{RE}}^{{(i,j)}^{m_{\mathrm{RE}}^{(i,j)}}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{{2m}_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}})}^{{-m}_{\mathrm{RD}}^{\left(i\right)}-1}\\ \&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}){\mathrm{d\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ <C_{\mathrm{RD}}^{\left(i\right)}>=B{\&Integral;}_0^{+\&Proportional;}\left(\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}-1}}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

for the safe capacity of the via node i of a corresponding jth eavesdropping node, for via node i is to the capacity average of the link of destination node; for via node i is to the capacity average of the link of eavesdropping node j; B is the bandwidth of security cooperation communication system; Γ () is gamma function; for via node i is to the waveform parameter of link under Nakagami-m channel of destination node; for via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the signal to noise ratio of the link of destination node; for via node i is to the signal to noise ratio of the link of eavesdropping node j; for via node i is to the signal to noise ratio average of the link of destination node; for via node i is to the transmitting power of the link of destination node; for via node i limits to the average power of the link of destination node; for the link of via node i to eavesdropping node j is in the noise power eavesdropping Nodes; for via node i is to the interruption thresholding of the link of destination node; by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Determine; for under Nakagami-m channel probability density function;

When described eavesdropping node is one, now R=1, j=1, what this eavesdropping node calculated was corresponding waits to select via node k ₁be described data retransmission via node k.

Further, when described eavesdropping node is multiple, namely during R>=2, calculate each described eavesdropping node corresponding wait select via node k _j;

When all eavesdropping nodes calculated corresponding in time selecting via node identical, then what all eavesdropping nodes were corresponding wait selects via node to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding in time selecting via node different, select to wait to select the via node that in via node, safe capacity is maximum to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding wait select to have part identical in via node in time selecting via node, ask identical wait to select the safe capacity of via node select the safe capacity of via node with value and not identical the waiting of residue, select described safe capacity with value or safe capacity value maximum treat that selection via node is described data retransmission via node k.

Further, when relaying node i to the link of destination node snr value lower than interruption thresholding time, via node i stops transmission data.

The invention has the beneficial effects as follows: (1) the inventive method considers the key factor in the application of this real system of power limited, devises the security cooperation relay selection method based on optimal user power division, there is Innovation and application and be worth; (2) the present invention adopts capacity average as the foundation of computationally secure capacity, reduces frequency and the system implementation complexity of relay swicthing, is particularly useful for the communication scenes in the unstable situation of channel; (3) main thought of the present invention is not only applicable to Nakagami-m fading channel, is equally applicable to other fading channel.

Accompanying drawing explanation

Fig. 1 is the flow chart of the security cooperation relay selection method based on optimal power allocation of the present invention;

Fig. 2 is the structure chart of the security cooperation relay selection system based on optimal power allocation of the present invention.

Embodiment

Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.

As shown in Figure 1, a kind of security cooperation relay selection method based on optimal power allocation, comprises the following steps:

Step S1, includes the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, wherein eavesdropping node is any node except source node, via node, destination node, adopt Nakagami-m channel, suppose that eavesdropping node does not receive the direct link signal from source node, eavesdropping node can only intercept the signal from via node, and wherein source node, destination node, via node and eavesdropping node all configure pilot channel.Suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero.

Step S2, measures and calculates desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero.The survey calculation method of above parameter, for be fruitful, repeats no more.

Step S3, according to the result of calculation of step S2, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k≤M.

Calculate each described eavesdropping node corresponding wait select via node k _j, wherein j represents jth eavesdropping node, supposes that described eavesdropping node is R, R be greater than zero integer, then j≤R, k _jwhat an expression jth eavesdropping node was corresponding waits to select via node; Wherein

$k_j=\underset{i\&Element;\mathrm{\&Theta;}}{\arg }\mathrm{Max}\left\{C_s^{(i,j)}\right\},$ And $C_s^{(i,j)}=<C_{\mathrm{RD}}^{\left(i\right)}>-<C_{\mathrm{RE}}^{(i,j)}>;$

$\begin{array}{c}<C_{\mathrm{RE}}^{(i,j)}>=B{\&Integral;}_0^{+\&Proportional;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}{m}_{\mathrm{RE}}^{{(i,j)}^{m_{\mathrm{RE}}^{(i,j)}}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{{2m}_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}})}^{{-m}_{\mathrm{RD}}^{\left(i\right)}-1}\\ \&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}){\mathrm{d\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ <C_{\mathrm{RD}}^{\left(i\right)}>=B{\&Integral;}_0^{+\&Proportional;}\left(\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}-1}}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

for the safe capacity of the via node i of a corresponding jth eavesdropping node, for via node i is to the capacity average of the link of destination node; for via node i is to the capacity average of the link of eavesdropping node j; B is the bandwidth of security cooperation communication system; Γ () is gamma function; for via node i is to the waveform parameter of link under Nakagami-m channel of destination node; for via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the signal to noise ratio of the link of destination node; for via node i is to the signal to noise ratio of the link of eavesdropping node j; for via node i is to the signal to noise ratio average of the link of destination node; for via node i is to the transmitting power of the link of destination node; for via node i limits to the average power of the link of destination node; for via node i is to the noise power of link at eavesdropping node j place of eavesdropping node j; for via node i is to the interruption thresholding of the link of destination node; When relaying node i to the link of destination node snr value lower than interruption thresholding time, via node i stops transmission data; by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Determine; for under Nakagami-m channel probability density function; There is achievement in research for utilizing, can to repeat no more.

It is pointed out that and work as time, via node i changes in quality for Rayleigh channel to the Nakagami-m channel of the link of destination node, and therefore the inventive method is equally applicable to Rayleigh channel.

When described eavesdropping node is one, now R=1, j=1, what this eavesdropping node calculated was corresponding waits to select via node k ₁be described data retransmission via node k.

When described eavesdropping node is multiple, namely during R>=2, calculate each described eavesdropping node corresponding wait select via node k _j;

When all eavesdropping nodes calculated corresponding in time selecting via node identical, then what all eavesdropping nodes were corresponding wait selects via node to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding in time selecting via node different, select to wait to select the via node that in via node, safe capacity is maximum to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding wait select to have part identical in via node in time selecting via node, ask identical wait to select the safe capacity of via node select the safe capacity of via node with value and not identical the waiting of residue, select described safe capacity with value or safe capacity value maximum treat that selection via node is described data retransmission via node k.

When not doing restriction and modifying, " signal to noise ratio " in the inventive method all refers to " Instant SNR ".

Main thought of the present invention is not only applicable to Nakagami-m fading channel, is equally applicable to other fading channel, and difference is that the parameter of different channels is distinguished to some extent, and the formula form obtained of deriving is distinguished to some extent, but derivation is identical.

Provide specific embodiment below in order to effect of the present invention to be described.

The security cooperation communication system of the present embodiment is made up of 1 source node, 3 via nodes, 1 destination node and 1 eavesdropping node (j=1), eavesdropping node and destination node are away from source node, and eavesdropping node can only eavesdrop the information from via node; Adopt Nakagami-m channel, system bandwidth is 2MHz.

(1) find after testing, all energy decoding success is from the signal of source node for via node 1, via node 2, via node 3, and therefore 3 via nodes form set of relay nodes Θ;

(2) each via node in set of relay nodes Θ measures the pilot signal from destination node and eavesdropping node respectively, calculates: $m_{\mathrm{RD}}^{\left(1\right)}=2.5,m_{\mathrm{RE}}^{\left(\mathrm{1,1}\right)}=1.0;m_{\mathrm{RD}}^{\left(2\right)}=2.0,m_{\mathrm{RE}}^{\left(\mathrm{2,1}\right)}=1.5;m_{\mathrm{RD}}^{\left(3\right)}=1.5,$ $m_{\mathrm{RE}}^{\left(\mathrm{3,1}\right)}=2.0;{\mathrm{\&Omega;}}_{\mathrm{RE}}^{\left(\mathrm{1,1}\right)}=2.8\&times;{10}^{-11},{\mathrm{\&Omega;}}_{\mathrm{RE}}^{\left(\mathrm{2,1}\right)}=2.6\&times;{10}^{-11},{\mathrm{\&Omega;}}_{\mathrm{RE}}^{\left(\mathrm{3,1}\right)}=2.3\&times;{10}^{-11};\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(1\right)}}={10}^{1.8},\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(2\right)}}={10}^{1.3},$ $\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(3\right)}}=10;\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(1\right)}}=\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(2\right)}}=\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(3\right)}}=1;{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{\left(\mathrm{1,1}\right)}\right)}^2={\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{\left(\mathrm{2,1}\right)}\right)}^2={\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{\left(\mathrm{3,1}\right)}\right)}^2={10}^{-14}.$ And by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Calculate ${\mathrm{\&gamma;}}_o^{(1,\mathrm{RD})}=0.97,{\mathrm{\&gamma;}}_o^{(2,\mathrm{RD})}=0.96,{\mathrm{\&gamma;}}_o^{(3,\mathrm{RD})}=0.91.$

(3) according to following formula:

$<C_{\mathrm{RE}}^{(i,j)}>=B{\&Integral;}_0^{+\&Proportional;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}{m}_{\mathrm{RE}}^{{(i,j)}^{m_{\mathrm{RE}}^{(i,j)}}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{{2m}_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}})}^{-m_{\mathrm{RD}}^{\left(i\right)}-1}$

$\begin{array}{c}\&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}){\mathrm{d\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ <C_{\mathrm{RD}}^{\left(i\right)}>=B{\&Integral;}_0^{+\&Proportional;}\left(\frac{m_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{{\left(i\right)}^{m_{\mathrm{RD}}^{\left(i\right)}-1}}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}){\mathrm{d\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

Calculate respectively $<C_{\mathrm{RE}}^{\left(\mathrm{1,1}\right)}>=10.49\mathrm{Mbit}/s,<C_{\mathrm{RE}}^{\left(\mathrm{2,1}\right)}>=6.32\mathrm{Mbit}/s,<C_{\mathrm{RE}}^{\left(\mathrm{3,1}\right)}>=3.44\mathrm{Mbit}/s,$ $<C_{\mathrm{RD}}^{\left(1\right)}>=11.42\mathrm{Mbit}/s,<C_{\mathrm{RD}}^{\left(2\right)}>=8.11\mathrm{Mbit}/s,<C_{\mathrm{RD}}^{\left(3\right)}>=6.15\mathrm{Mbit}/s.$ So, according to calculate k ₁=3, via node 3 should be selected to carry out data retransmission.

By the method for the above-mentioned security cooperation relay selection based on optimal power allocation, construct a kind of security cooperation relay selection system based on optimal power allocation accordingly, as shown in Figure 2, based on a security cooperation relay selection system for optimal power allocation, comprise set of relay nodes and build module, parameter calculating module and data retransmission via node computing module;

Described set of relay nodes builds module and is used for including the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, described security cooperation communication system adopts Nakagami-m channel, suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero;

Described parameter calculating module is used for measuring and calculating desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero;

Described data retransmission via node computing module is used for the result of calculation according to described parameter calculating module, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k be greater than zero integer and k≤M.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1., based on a security cooperation relay selection method for optimal power allocation, it is characterized in that, comprise the following steps:

Step S1, includes the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, described security cooperation communication system adopts Nakagami-m channel, suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero;

Step S2, measures and calculates desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero;

Step S3, according to the result of calculation of step S2, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k be greater than zero integer and k≤M.

2. the security cooperation relay selection method based on optimal power allocation according to claim 1, it is characterized in that, in step S1, described eavesdropping node is other nodes except described source node, described via node and described destination node, described eavesdropping node does not receive the direct link signal from described source node, described eavesdropping node can only intercept the signal from described via node, and described source node, described destination node, described via node and described eavesdropping node all configure pilot channel.

3. the security cooperation relay selection method based on optimal power allocation according to claim 1, is characterized in that, in step S3, calculate each described eavesdropping node corresponding wait select via node k _j, k _jwhat an expression jth eavesdropping node was corresponding waits to select via node; Wherein

$k_j=\underset{i\&Element;\mathrm{\&Theta;}}{\arg }\mathrm{Max}\left\{C_x^{(i,j)}\right\},$ And $C_s^{(i,j)}=\&lang;C_{\mathrm{RD}}^{\left(i\right)}\&rang;-\&lang;C_{\mathrm{RE}}^{(i,j)}\&rang;;$

$\begin{array}{c}\&lang;C_{\mathrm{RE}}^{(i,j)}\&rang;=B{\&Integral;}_0^{+\&infin;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}}{m}_{\mathrm{RE}}^{(i,j)m_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{2m_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{P_{\mathrm{RD}}^{\left(i\right)}})}^{-m_{\mathrm{RD}}^{\left(i\right)}-1}\\ \&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)})d{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ \&lang;C_{\mathrm{RD}}^{\left(i\right)}\&rang;=B{\&Integral;}_0^{+\&infin;}\left(\frac{m_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}-1}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{{\mathrm{\&gamma;}}_{\text{RD}}^{\left(i\right)}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)})d{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

for the safe capacity of the via node i of a corresponding jth eavesdropping node, for via node i is to the capacity average of the link of destination node; for via node i is to the capacity average of the link of eavesdropping node j; B is the bandwidth of security cooperation communication system; Γ () is gamma function; for via node i is to the waveform parameter of link under Nakagami-m channel of destination node; for via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the signal to noise ratio of the link of destination node; for via node i is to the signal to noise ratio of the link of eavesdropping node j; for via node i is to the signal to noise ratio average of the link of destination node; for via node i is to the transmitting power of the link of destination node; for via node i limits to the average power of the link of destination node; for via node i is to the noise power of link at eavesdropping node j place of eavesdropping node j; for via node i is to the interruption thresholding of the link of destination node; by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right)d{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Determine; for under Nakagami-m channel probability density function;

When described eavesdropping node is one, now R=1, j=1, what this eavesdropping node calculated was corresponding waits to select via node k ₁be described data retransmission via node k.

4. the security cooperation relay selection method based on optimal power allocation according to claim 3, is characterized in that, when described eavesdropping node is multiple, namely during R>=2, calculate each described eavesdropping node corresponding wait select via node k _j;

When all eavesdropping nodes calculated corresponding in time selecting via node identical, then what all eavesdropping nodes were corresponding wait selects via node to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding in time selecting via node different, select to wait to select the via node that in via node, safe capacity is maximum to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding wait select to have part identical in via node in time selecting via node, ask identical wait to select the safe capacity of via node select the safe capacity of via node with value and not identical the waiting of residue, select described safe capacity with value or safe capacity value maximum treat that selection via node is described data retransmission via node k.

5. the security cooperation relay selection method based on optimal power allocation according to claim 2, is characterized in that, in step S3, when relaying node i to the link of destination node snr value lower than interruption thresholding time, via node i stops transmission data.

6. based on a security cooperation relay selection system for optimal power allocation, it is characterized in that, comprise set of relay nodes and build module, parameter calculating module and data retransmission via node computing module;

Described set of relay nodes builds module and is used for including the via node of energy decoding success source node signal in security cooperation communication system in set of relay nodes Θ; Described security cooperation communication system comprises a source node, destination node, N number of via node and a R eavesdropping node, described security cooperation communication system adopts Nakagami-m channel, suppose that energy decoding success is M from the via node of source node signal, then M≤N, M, N and R are the integer being greater than zero;

Described parameter calculating module is used for measuring and calculating desired parameters, and desired parameters comprises the link waveform parameter under Nakagami-m channel of the via node i in described set of relay nodes Θ to described destination node via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j via node i is to the signal to noise ratio average of the link of described destination node via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j and the noise power at eavesdropping node j place wherein said via node i represents i-th via node in set of relay nodes Θ, and i≤M, eavesdropping node j represent a jth eavesdropping node, and j≤R, i and j are the integer being greater than zero;

Described data retransmission via node computing module is used for the result of calculation according to described parameter calculating module, calculate and choose data retransmission via node k, described data retransmission via node k is the via node k carrying out data relay forwarding, and described via node k represents a kth via node in set of relay nodes Θ, k be greater than zero integer and k≤M.

7. the security cooperation relay selection system based on optimal power allocation according to claim 6, it is characterized in that, described eavesdropping node is other nodes except described source node, described via node and described destination node, described eavesdropping node does not receive the direct link signal from described source node, described eavesdropping node can only intercept the signal from described via node, and described source node, described destination node, described via node and described eavesdropping node all configure pilot channel.

8. the security cooperation relay selection system based on optimal power allocation according to claim 6, is characterized in that, calculate each described eavesdropping node corresponding wait select via node k _j, k _jwhat an expression jth eavesdropping node was corresponding waits to select via node; Wherein

$k_j=\underset{i\&Element;\mathrm{\&Theta;}}{\arg }\mathrm{Max}\left\{C_x^{(i,j)}\right\},$ And $C_s^{(i,j)}=\&lang;C_{\mathrm{RD}}^{\left(i\right)}\&rang;-\&lang;C_{\mathrm{RE}}^{(i,j)}\&rang;;$

$\begin{array}{c}\&lang;C_{\mathrm{RE}}^{(i,j)}\&rang;=B{\&Integral;}_0^{+\&infin;}{\&Integral;}_0^{+\&infin;}\frac{m_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}}{m}_{\mathrm{RE}}^{(i,j)m_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{2m_{\mathrm{RE}}^{(i,j)}}{\left({\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}-1}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right)\mathrm{\&Gamma;}\left(m_{\mathrm{RE}}^{(i,j)}\right){\left({\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\left(\frac{1}{P_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RE}}^{(i,j)}}{(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{P_{\mathrm{RD}}^{\left(i\right)}}{P_{\mathrm{RD}}^{\left(i\right)}})}^{-m_{\mathrm{RD}}^{\left(i\right)}-1}\\ \&times;\exp (-\frac{m_{\mathrm{RE}}^{(i,j)}{\left({\mathrm{\&sigma;}}_{\mathrm{RE}}^{(i,j)}\right)}^2{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}}{{\mathrm{\&Omega;}}_{\mathrm{RE}}^{(i,j)}{P}_{\mathrm{RD}}^{\left(i\right)}}-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\frac{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}}{\stackrel{\&OverBar;}{P_{\mathrm{RD}}^{\left(i\right)}}-{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}{P}_{\mathrm{RD}}^{\left(i\right)}}){\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)})d{\mathrm{\&gamma;}}_{\mathrm{RE}}^{(i,j)}{\mathrm{dP}}_{\mathrm{RD}}^{\left(i\right)};\\ \&lang;C_{\mathrm{RD}}^{\left(i\right)}\&rang;=B{\&Integral;}_0^{+\&infin;}\left(\frac{m_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}}}{\mathrm{\&Gamma;}\left(m_{\mathrm{RD}}^{\left(i\right)}\right){\left(\stackrel{\&OverBar;}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\right)}^{m_{\mathrm{RD}}^{\left(i\right)}}}\right){\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)m_{\mathrm{RD}}^{\left(i\right)}-1}{e}^{-\frac{m_{\mathrm{RD}}^{\left(i\right)}}{{\mathrm{\&gamma;}}_{\text{RD}}^{\left(i\right)}}{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}{\log }_2(1+{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)})d{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)};\end{array}$

for the safe capacity of the via node i of a corresponding jth eavesdropping node, for via node i is to the capacity average of the link of destination node; for via node i is to the capacity average of the link of eavesdropping node j; B is the bandwidth of security cooperation communication system; Γ () is gamma function; for via node i is to the waveform parameter of link under Nakagami-m channel of destination node; for via node i is to the waveform parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the average power parameter of link under Nakagami-m channel of eavesdropping node j; for via node i is to the signal to noise ratio of the link of destination node; for via node i is to the signal to noise ratio of the link of eavesdropping node j; for via node i is to the signal to noise ratio average of the link of destination node; for via node i is to the transmitting power of the link of destination node; for via node i limits to the average power of the link of destination node; for the link of via node i to eavesdropping node j is in the noise power eavesdropping Nodes; for via node i is to the interruption thresholding of the link of destination node; by ${\&Integral;}_{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}^{+\&infin;}(\frac{1}{{\mathrm{\&gamma;}}_o^{(i,\mathrm{RD})}}-\frac{1}{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}})f_{{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}}\left({\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}\right)d{\mathrm{\&gamma;}}_{\mathrm{RD}}^{\left(i\right)}=1$ Determine; for under Nakagami-m channel probability density function;

When described eavesdropping node is one, now R=1, j=1, what this eavesdropping node calculated was corresponding waits to select via node k ₁be described data retransmission via node k.

9. the security cooperation relay selection system based on optimal power allocation according to claim 8, is characterized in that, when described eavesdropping node is multiple, namely during R>=2, calculate each described eavesdropping node corresponding wait select via node k _j;

When all eavesdropping nodes calculated corresponding in time selecting via node identical, then what all eavesdropping nodes were corresponding wait selects via node to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding in time selecting via node different, select to wait to select the via node that in via node, safe capacity is maximum to be described data retransmission via node k;

When all eavesdropping nodes calculated corresponding wait select to have part identical in via node in time selecting via node, ask identical wait to select the safe capacity of via node select the safe capacity of via node with value and not identical the waiting of residue, select described safe capacity with value or safe capacity value maximum treat that selection via node is described data retransmission via node k.

10. the security cooperation relay selection system based on optimal power allocation according to claim 8, is characterized in that, when relaying node i to the link of destination node snr value lower than interruption thresholding time, via node i stops transmission data.