CN104703246B - The relay selection method adaptively merged based on fast, slow speed link - Google Patents
The relay selection method adaptively merged based on fast, slow speed link Download PDFInfo
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- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
Abstract
The invention discloses a kind of relay selection method adaptively merged based on fast, slow speed link, and the described method includes the relay selection of safety decoding forward collaboration network and the relay selection of common collaborative network.The features of the present invention：(1) a kind of method for distinguishing channel state variations frequency is proposed, according to the method selection using quick or slow speed link adaptive mode, the performance of system is improved and reduces the complexity of system.(2) in view of reality system is generally transmitted using link circuit self-adapting, therefore institute's extracting method of the present invention can be used for reality system, have realistic feasibility.(3) secrecy capacity has been taken into account in the selection of security cooperation network trunk and whether has used the switching frequency between interfering nodes, relay selection is established on the judgement basis to actual channel in common collaborative network, so that relay selection is more reasonable, there is realistic meaning.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a relay selection method based on self-adaptive fusion of fast and slow links.
Background
In a secure cooperative network, due to the nature of the broadcast wireless medium, all users in the system coverage area may eavesdrop on the source information. The ability to keep information secret in communications and to protect the communications link from eavesdropping by potential eavesdroppers is becoming increasingly important. Information privacy in traditional wireless networks is a field of higher layer protocol stacks, using cryptographic privacy schemes. However, information security implemented at higher levels faces increasing challenges of potential concern. Accordingly, in order to further improve the security performance of the mobile communication system, attention is paid to the physical layer information security. Both the fast and slow link adaptation modes can be used for a secure cooperative network and a common cooperative network, but at present, the influence of the fast and slow link adaptation technologies is not considered in relay selection of the two networks.
Disclosure of Invention
The invention provides a relay selection method based on self-adaptive fusion of fast and slow links, which respectively provides respective relay selection methods on the basis of self-adaptive fusion of the fast and slow links aiming at a safe cooperative network and a common cooperative network, thereby effectively realizing the relay selection of a cooperative communication system adopting a link self-adaptive transmission mode. The invention is characterized in that: (1) A method for distinguishing the change frequency of the channel state is provided, the more frequent the change of the channel state is, the less ideal the channel state can be, according to the method, a fast or slow link self-adaption mode is selected and used, and the self-adaption fusion of two types of links in an actual communication scene is effectively realized, so that the performance of a system is improved to a certain extent, and the complexity of the system is reduced. (2) Different from the conventional relay selection method, the relay selection method provided by the invention considers a link adaptive transmission mode, and the method can be used for a real system and has practical feasibility in view of the fact that the real system generally adopts link adaptive transmission. (3) In the relay selection of the safe cooperative network, the secret capacity and the switching frequency of whether the interference nodes are used are considered, and the relay selection is established on the basis of the judgment of an actual channel in the common cooperative network, so that the relay selection is more reasonable and has practical significance.
The technical solution of the present invention is explained below.
A relay selection method based on self-adaptive fusion of fast and slow links comprises relay selection of a safe decoding forwarding cooperative network and relay selection of a common cooperative network. The relay selection of the safe decoding forwarding cooperation network comprises the following steps:
(1) Two relay nodes are selected, one relay node R is used for normally transmitting data, and the other relay node J is used as an interference node.
(2) On the premise that the set of interfering nodes is not empty, if an interfering node is used:
if no interfering node is used:
wherein:respectively a candidate relay node and an interference node when the interference node is used;is a candidate relay node when no interfering node is used;representing the instantaneous signal-to-noise ratio or the average signal-to-noise ratio of the link from the node i to the destination node D;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of a link from the node i to the interception node E;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of a link from the interference node J to the destination node D;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of a link from the interference node J to the interception node E; i belongs to a set of relay nodes C d ，C d A relay node set which can successfully decode and forward the signal from the source node is obtained; the interference node J belongs to an interference node set J set And J ≠ i, set of interfering nodes J set The relay node is composed of relay nodes capable of being used as interference nodes.
(3) If it isThe interfering node is used and selectedAnd J * Respectively as a relay node and an interference node; if it isThen no interfering node is used and selectedAs a relay node.
The relay selection of the common cooperative network comprises the following steps:
(1) The i-th (i =1,2.. N.) is obtained by estimation d ) The instantaneous SNR sample of the D link from the relay node to the destination node isN d The total number of the relay nodes is,representing the instant SNR samples of the link from the nth relay node i to the destination node D, respectively calculating the average value of the instant SNR samples of the linkVariance (variance)Deflection degreeAnd kurtosis
(2) Assuming the link channel type is phi, estimating the channel parameters, and the instantaneous SNR probability density function of various channelsWherein N is i,D 、Parameters describing different channel types; obtaining the average value of the instantaneous signal-to-noise ratio of the channel with the assumed channel type phi according to the instantaneous signal-to-noise ratio probability density functionVariance (variance)Deflection degreeAnd kurtosis
(3) And (3) calculating:
minimum epsilon φ The corresponding assumed channel type is the actual channel type of the link, and a channel parameter N is determined i,D 、And
(4) The link adopts the interruption probability when the slow link is self-adaptive:
the link adopts the interruption probability when the fast link adapts:
wherein: m is the number of the M-QAM modulating levels,is a function of the gaussian-Q function,represents the largest integer less than or equal to x; h represents the number of bits,k represents the dimension of the optical fiber,l denotes the number of Gamma components, l =1 i,D ；The signal-to-noise ratio from the relay node i to the destination node D when the slow link is used for self-adaptation;the signal-to-noise ratio from the relay node i to the destination node D when fast link adaptation is used.
(5) According toSelecting a relay node; wherein: r is * Is the selected relay node; when the link employs fast link adaptation,when the link employs slow link adaptation,
Detailed Description
Each link adopts a fast or slow self-adaptive transmission mode, the fast link self-adaptation determines a modulation mode according to the instant signal-to-noise ratio, and the slow link self-adaptation determines the modulation mode according to the average signal-to-noise ratio. And selecting to use a fast or slow link self-adaptive technology according to the judgment of whether the channel changes frequently. Considering the close relation between the moving speed and the channel change frequency, when the destination node moves with v D ≤υ 0 When the link channel state is judged to be infrequent change, the method is applicable to a fast link self-adaptive technology; when upsilon is 0 ＜υ D ≤υ 1 When the link channel state is judged to be normal change, the safety protocolSelecting a link self-adaptive mode corresponding to the maximum channel secret capacity on the premise of only changing the link self-adaptive mode in the network, and selecting a link self-adaptive mode corresponding to the minimum interruption probability on the premise of only changing the link self-adaptive mode in the common cooperative network; when upsilon is D ＞υ 1 And judging that the channel condition of the link is frequently changed, and adopting a slow link self-adaptive technology. Wherein: upsilon is D Is the node moving speed; upsilon is 0 Is a first threshold speed, and is not less than upsilon at 10km/h 0 ≤30km/h；υ 1 Is a second threshold speed, 40km/h is less than or equal to upsilon 1 Less than or equal to 60km/h. By usingRepresenting the instantaneous signal-to-noise ratio (W = F) or the average signal-to-noise ratio (W = S) of the link between node i and node j (denoted as i → j link).
Secure transcoding forwarding cooperative network relay selection
All users in the secure cooperative network can eavesdrop Source information, and when a Source S (Source) sends data to a Destination node D (Destination), the Source S (Source) can be eavesdropped by an eavesdropping node E (Eave drop). Two Relay nodes are selected, one Relay node R (Relay) is used for normally transmitting data, the other Relay node J (Jammer) is used as an interference node, and a signal sent out from the J is an interference signal and plays a role in interference. Since interference is not always beneficial to the system, in order to overcome this limitation it is proposed that the system can switch between using the interfering node and not using the interfering node.
Representing the instantaneous or average signal-to-noise ratio of link i → D,representing the instantaneous or average signal-to-noise ratio of link i → E,representing the instantaneous or average signal-to-noise ratio of link J → D,representing the instantaneous or average signal-to-noise ratio of link J → E. Wherein i belongs to a set of relay nodes C d ，C d To a set of relay nodes that can successfully decode and forward signals from a source node. J belongs to an interference node set J set And J ≠ i, interfering node set J set The relay node can be used as an interference node. When in useWhen "positive interference" (interference of J on E) is greater than "negative interference" (interference of J on D), the interference is greater thanState and last for a period of time t (t > t) 0 ) Then, the node can be used as an interference node; otherwise, this node may not act as an interfering node. When interfering with node set J set When the change occurs, relay selection needs to be performed again.
(1) On the premise that the set of interfering nodes is not empty, if an interfering node is used:
are candidate relay nodes and interfering nodes when using interfering nodes. Wherein
Due to the uncertainty of the eavesdropping node E, the signal-to-noise ratios of all the links are not estimated, and thus the eavesdropping node can be divided into a position-determined eavesdropping node and a position-indeterminate eavesdropping node. For a determined location of the eavesdropping node,andcan be estimated; for an uncertain position eavesdropping on a node,wherein P is (R) ,P (J) Transmission power, σ, for the R → E, J → E links, respectively 2 Is a gaussian white noise variance;andcan still be derived from the estimation.
(2) If no interfering node is used:
are candidate relay nodes when no interfering node is used. For a determined location of the eavesdropping node,can be estimated; for an uncertain position eavesdropping on a node, can still be derived from the estimation.
The relay selection algorithm is as follows:
if it isThen using interferenceNode, selectionAnd J * Respectively as a relay node and an interference node; if it isThen no interfering node is used, and selection is madeAs a relay node.
And (II) selecting the relay of the common cooperative network.
The i-th (i =1,2.. N.) is obtained by estimation d ) The instantaneous SNR sample of the D link from the relay node to the destination node is
Mean of the link instantaneous snr samples:
the variance of the link instantaneous signal-to-noise ratio samples is:
the skewness of the link instantaneous signal-to-noise ratio sample is as follows:
the kurtosis of the link instantaneous signal-to-noise ratio sample is:
assuming that the channel type is phi, the channel parameters are estimated, and the estimation method has an existing implementation method and is not described any further. Describing instantaneous SNR probability density function of various channels by mixed gamma distribution
Wherein N is i,D 、Are parameters. When the distribution describes different channels, the parameters have different expressions. For example, when the channel is a Rayleigh channel, N i,D ＝1、 WhereinIs the i → D link average signal-to-noise ratio; when the channel is a Nakagami-m channel, N i,D ＝1、Where m is an estimable channel parameter,i → D link average signal-to-noise ratio.
The instantaneous SNR mean value of the assumed channel model can be obtained according to the instantaneous SNR probability density functionAnd the instantaneous signal-to-noise ratio variance of the hypothetical channel modelInstantaneous signal-to-noise skewnessAnd instantaneous signal-to-noise ratio kurtosisWhere phi is respectively different channel types, e.g. Rayleigh channel, K G When the channel, eta-mu channel, nakagami channel, etc. are being calculated, the corresponding channels are calculatedAndthen, calculating:
ε φ the smaller the statistical property of the instantaneous signal-to-noise ratio sample is, the more consistent the statistical property of the hypothetical channel phi is, the smaller the minimum epsilon φ The corresponding hypothetical channel is the actual channel of the link. N is a radical of i,D 、The parameters are parameters of the channel model.
Based on the result of channel judgment, the interrupt probabilities of the link adopting the slow link and the fast link when adapting are respectively obtained as follows:
wherein: m is the number of stages of M-QAM modulation;is a gaussian-Q function;represents a maximum integer of x or less; h represents the number of bits,k represents the dimension of the optical fiber,l denotes the number of Gamma components, l =1 i,D 。
In summary, the relay selection algorithm is as follows:
R * for the selected relay node, when the link employs fast link adaptation,when the link employs slow link adaptation,
the following examples are given to illustrate the effects of the present invention.
Relay selection for a secure collaborative network.
In the coverage area of the base station, 5 relay nodes can receive and forward information, which are respectively R 1 、R 2 、R 3 、R 4 、R 5 The destination node is D, and the eavesdropping node is E. The system is the known position of the eavesdropping node, and the signal-to-noise ratio of each link is estimated by the self-adaptive technology.
Get v 0 ＝10km/h，v 1 And =60km/h. Moving speed v of destination node D D =80km/h, eavesdropping node E is stationary node, i.e. v E And =0km/h. Due to v D >v 1 The link channel from each relay node to the destination node D changes frequently, and a slow adaptive technology (SAM) is used; due to v E <v 0 Each ofThe link channel from the relay node to the interfering node E changes infrequently, using fast adaptive techniques (FAM).
The signal-to-noise ratio of the i → j link is obtained by estimation(dB) is as follows:
R 1 → link D:
R 2 → link D:
R 3 link → D:
R 4 → link D:
R 5 link → D:
R 1 link → E:
R 2 link → E:
R 3 link → E:
R 4 link → E:
R 5 link → E:
get t 0 ＝0.1s。
For R 1 Node due toThen R is 1 And cannot act as an interfering node.
For R 2 Node due toAnd is provided withDuration of state t 2 >t 0 Then R is 2 May act as an interfering node.
For R 3 Node due toAnd is provided withDuration of the state t 3 >t 0 Then R is 3 Can be used as an interference node,.
For R 4 Node due toThen R is 4 And cannot act as an interfering node.
For R 5 Node due toThen R is 5 And cannot act as an interfering node.
From the above, the set that can be an interference node is J set ∈{R 2 ,R 3 }。
The interference nodes are collected into a non-empty set, and when the interference nodes are used, the interference nodes are collected into a non-empty setInto C S (R, J), secret capacity as follows:
C S (R 1 ,R 2 )＝0.3925；
C S (R 1 ,R 3 )＝0.3942；
C S (R 2 ,R 3 )＝0；
C S (R 3 ,R 2 )＝0.3070
C S (R 4 ,R 2 )＝0.3390；
C S (R 4 ,R 3 )＝0.3552；
C S (R 5 ,R 2 )＝0.023；
C S (R 5 ,R 3 )＝0；
then theI.e. selecting R separately 1 、R 3 Candidate relay nodes and candidate interference nodes when the interference node is used.
When no interfering node is used, it willInto C S (R), secret capacity as follows:
C S (R 1 )＝0.4037；
C S (R 2 )＝0；
C S (R 3 )＝0；
C S (R 4 )＝0.4312；
C S (R 5 )＝0；
then theI.e. selecting R 4 Is a candidate relay node when the interference node is not used.
Due to max (C) s (R 1 ,R 3 ),C S (R 4 ))＝C S (R 4 ) Then, without using the interference node, select R 4 Is a relay node.
And (II) relay selection of the common cooperative network.
The total 2 relay nodes in the coverage field of the base station can receive and forward information, which are respectively R 1 、R 2 . The system is a known eavesdropping node position, and the signal-to-noise ratio of each link is estimated by a self-adaptive technology.
Get v 0 ＝10km/h，v 1 And =60km/h. Moving speed v of destination node D D And =80km/h, the complexity of the link channel from each relay node to the destination node D changes frequently, and the SAM is used for estimating the signal-to-noise ratio of the link. Obtaining n samples from the signal-to-noise ratio from each relay node to the destination node to form random variables(dB) is as follows:
(1)R 1 link → D:
R 1 mean, variance, skewness and kurtosis of the D link signal-to-noise ratio samples are as follows:
the mean, variance, skewness and kurtosis of the rayleigh channel are as follows:
then e is Rayleigh medium ＝0.0107。
The rice factor n =8 is estimated, and the mean, variance, skewness and kurtosis of the rice channel are as follows:
then e Rice ＝0.8659。
Then e Rayleigh medium <ε Rice The channel is a rayleigh channel, so N =1,β u ＝1，
probability of interruption
(2)R 2 → link D:
R 2 mean, variance, skewness and kurtosis of the → D link snr samples are as follows:
the mean, variance, skewness and kurtosis of the rayleigh channel are as follows:
then e Rayleigh medium ＝0.0369。
The rice factor n =8 is estimated, and the mean, variance, skewness and kurtosis of the rice channel are as follows:
then e Rice ＝1.0199。
Then e Rayleigh medium <ε Rice The channel model adopts a Rayleigh channel model. Taking the number of N =1,β u ＝1，
probability of interruption
ThenNamely, selecting R 2 As a relay.
Claims (2)
1. A relay selection method based on self-adaptive fusion of fast and slow links, the method comprises the following steps:
the relay selection of the safe decoding forwarding cooperative network and the relay selection of the common cooperative network; selection principle of fast or slow link self-adaptive technology;
the relay selection of the safe decoding forwarding cooperation network comprises the following steps:
(1) Selecting two relay nodes, wherein one relay node R is used for normally transmitting data, and the other relay node J is used as an interference node;
(2) On the premise that the set of interfering nodes is not empty, if an interfering node is used:
if no interfering node is used:
wherein:J * respectively a candidate relay node and an interference node when the interference node is used;is a candidate relay node when no interfering node is used;representing the instantaneous signal-to-noise ratio or the average signal-to-noise ratio of the link from the node i to the destination node D;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of a link from the node i to the interception node E;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of the link from the interference node J to the destination node D;representing the instant signal-to-noise ratio or the average signal-to-noise ratio of a link from the interference node J to the interception node E; i belongs to a set of relay nodes C d ，C d A relay node set which can successfully decode and forward the signal from the source node is obtained; the interference node J belongs to an interference node set J set And J ≠ i, set of interfering nodes J set The method comprises the following steps that a relay node capable of being used as an interference node is formed;
(3) If it isThe interfering node is used and selectedAnd J * Respectively as a relay node and an interference node; if it isThen no interfering node is used and selectedAs a relay node;
the relay selection of the common cooperative network comprises the following steps:
(1) The i-th (i =1,2.. N.) is obtained by estimation d ) The instantaneous SNR sample of the D link from the relay node to the destination node isRespectively calculating the average value of the instantaneous SNR samples of the linkVariance (variance)Deflection degreeAnd kurtosisWherein: n is a radical of d The total number of the relay nodes is,representing an instant signal-to-noise ratio sample of an ith relay node to a destination node D link;
(2) Assuming the link channel type is phi, estimating the channel parameters, and the instantaneous SNR probability density function of various channelsWherein, N i,D 、Parameters describing different channel types; obtaining the average value of the instantaneous signal-to-noise ratio of the channel with the assumed channel type phi according to the instantaneous signal-to-noise ratio probability density functionVariance (variance)Deflection degreeAnd kurtosis
(3) And (3) calculating:
minimum epsilon φ The corresponding assumed channel type is the actual channel type of the link, and a channel parameter N is determined i,D 、And
(4) The link adopts the interruption probability when the slow link is self-adaptive:
the link adopts the interruption probability when the fast link self-adapts:
wherein: m is the stage number of M-QAM modulation;is a gaussian-Q function;represents the largest integer less than or equal to x;h represents the number of bits,k represents the dimension of the object(s),l denotes the number of Gamma components, l =1 i,D ；The signal-to-noise ratio from the relay node i to the destination node D when the slow link is used for self-adaptation;the signal-to-noise ratio from the relay node i to the destination node D when the fast link adaptation is used;
(5) According toSelecting a relay node; wherein: r is * Is the selected relay node; when the link employs fast link adaptation,when the link employs slow link adaptation,
the selection principle of the fast or slow link adaptation technique is as follows:
(1) When upsilon is D ≤υ 0 When the link channel state is judged to be infrequent change, the method is applicable to a fast link self-adaptive technology;
(2) When upsilon is 0 ＜υ D ≤υ 1 Then, judging that the channel condition of the link is common change, and selecting the corresponding link self-adaptive mode when the channel security capacity is maximum on the premise of only changing the link self-adaptive mode in the secure cooperative network; selecting adaptive mode of only changing link in common cooperative networkA corresponding link adaptation mode when the interruption probability is minimized;
(3) When upsilon is D ＞υ 1 Judging that the channel condition of the link is frequently changed, and adopting a slow link self-adaptive technology; wherein: upsilon is D Is the node moving speed; upsilon is 0 Is a first threshold speed, and is not less than upsilon at 10km/h 0 ≤30km/h；υ 1 Is a second threshold speed, 40km/h is less than or equal to upsilon 1 ≤60km/h。
2. The method of claim 1, wherein the determination principle of the interfering node: when atWhen the state is continued for a period of time t, t is more than t 0 ，t 0 For a time setting, the node can be used as an interference node; otherwise, this node may not act as an interfering node.
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| CN103702322A (en) * | 2013-12-11 | 2014-04-02 | 西安交通大学 | Physical layer security transmission method for resisting sniffing of unreliable relay nodes |
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