CN106656297A - Cognitive orthogonal cooperative transmission method in the presence of primary user interference - Google Patents

Cognitive orthogonal cooperative transmission method in the presence of primary user interference Download PDF

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Publication number
CN106656297A
CN106656297A CN201610898332.5A CN201610898332A CN106656297A CN 106656297 A CN106656297 A CN 106656297A CN 201610898332 A CN201610898332 A CN 201610898332A CN 106656297 A CN106656297 A CN 106656297A
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primary user
node
signal
user
receiver
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司江勃
王婷婷
李赞
黄海燕
梁琳琳
郝本建
关磊
齐佩汉
邓逸博
刘伯阳
王丹洋
万鹏武
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Xidian University
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15578—Relay station antennae loop interference reduction by gain adjustment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a cognitive orthogonal cooperative transmission method in the presence of primary user interference mainly in order to solve the problem that the reliability of the transmission is low in the presence of primary user interference in the prior art. The method comprises the following steps: (1) a secondary user source node broadcasts a pilot signal; (2) a secondary user destination node decodes the received signal, and checks the decoded signal; if check succeeds, the secondary user destination node sends data; or, relay nodes decode the received signal and check the decoded signal; if decoding fails, the relay nodes do not forward information any longer; or, the relay nodes send the pilot signal, and the destination node returns a response signal; (3) the relay nodes select optimal relay decoding according to the received signal to interference and noise ratio, and forward an orthogonal copy of the source node information to the destination node; and (4) the destination node merges the signals of two time slots, and completes cognitive orthogonal cooperative transmission. The method can save sending power while satisfying the requirement of communication quality, and can be used in a cooperative relay system.

Description

There is cognitive quadrature-synergy transmission method when primary user disturbs
Technical field
The invention belongs to communication technical field, is related to cooperating relay technology, a kind of cognitive quadrature-synergy is further related to Transmission, can be used for there is cognition wireless telecommunication when primary user disturbs.
Background technology
Developing rapidly for radio communication is provided more gradually with the work emerged in large numbers for people of emerging wireless applications in a large number, life Enrich and easily service.However, with the swift and violent growth of GSM and wireless device, it is possible to use frequency spectrum become It is day by day nervous, the increasingly complicated wireless application demand of people cannot have been met.At the same time, according to FCC The statistics of FCC, major part has authorized frequency spectrum in zones of different or period often in idle state, causes frequency spectrum resource reality The average utilization on border only about 30%.In order to alleviate ever-increasing wireless communication needs and frequency spectrum resource it is in short supply between Contradiction, cognitive radio CR technologies are arisen at the historic moment.In actual cognition wireless telecommunication, due to power limit, multipath fading, The factors such as shade masking, interference noise affect and cause existing " point-to-point " communication performance to deteriorate, in reducing cognition network The reliability that single point signals are transmitted and received.
Relative to direct Transmission system, via node assists the system of source node transmission to obtain capacity gain, most allusion quotation The cooperating relay transmission of type is that the three node lists relaying double bounce cooperating relay for including source node, via node and destination node is passed It is defeated.In single relay cooperative transmission, by sharing mutual antenna between different transmission nodes, virtual multi input is formed many Output mimo antenna array so that single antenna node can also obtain space diversity gain, to realize resisting radio communication channel The effect of decline.Relative to MIMO technology, cooperating relay transmission technology need not be equipped with many antennas in wireless terminal, be uncomfortable Preferably installing handheld terminal, sensor node of many antennas etc. increases channel capacity there is provided feasible way.
Therefore, highly-reliable transmission of cognitive transmission theory of the research based on cooperating relay thought to guarantee wireless communication system With important Research Significance and researching value.
It is traditional based on time-multiplexed cooperative diversity system in, typical two users cooperation scene is：Each user The half of itself available time slot is sent into local information, second half is used for sending the trunk information of partner.Obviously, such cooperation Resource distribution mode is not optimum, and it can cause the rate loss of system bandwidth extension and collaboration user.Therefore how to set The highly efficient cooperation resource distribution mode of meter is an important research direction in collaboration diversity field.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of cognition existed when primary user disturbs is proposed Quadrature-synergy transmission method, to carry out cooperation transmission in the case where system bandwidth is not increased, while reducing the speed of collaboration user Rate is lost.
For achieving the above object, technical scheme includes as follows：
(1) secondary user's source node s estimates oneself and primary user receiver vqBetween instantaneous channel state information aq, it is determined that Transmission power P of oneselfs, and with transmission power PsBroadcast pilot, 1≤q≤M, M represents primary user's receiver number；
(2) secondary customer objective node d estimates the instantaneous channel state between primary user's emitter and secondary customer objective node Information ej, while estimating that it receives Signal to Interference plus Noise Ratio ε according to the signal quality for receivingj, and according to the Signal to Interference plus Noise Ratio ε for estimatingjDecoding The signal for receiving, 1≤j≤N, N represents the emitter number of primary user；
(3) secondary customer objective node is circulated redundancy check to decoded signal, the secondary user source if verifying successfully Node starts to send data；If verification failure, execution step 4；
(4) all of via node is estimated to receive Signal to Interference plus Noise Ratio according to the pilot signal of the secondary user's source node for receiving γi, and the reception Signal to Interference plus Noise Ratio γ estimated according to oneselfiThe signal that decoding is received, 1≤i≤K, K represents via node number；
(5) all of via node is circulated redundancy check to decoded signal：
If not over verification, being considered as decoding failure, via node no longer forwards source node identification to secondary customer objective Node；
If by verification, being considered as successfully decoded, execution step (6)；
(6) via node estimates oneself and the channel condition information f between primary user's receiveriq, determine transmission power Pi, And with transmission power PiPilot signal transmitted is receiving via node transmission to time customer objective node, secondary customer objective node Pilot signal after reply an answer signal；
(7) each via node estimates it with secondary customer objective node according to time answer signal of customer objective node is received Between channel condition information hi, and with reference to the instantaneous channel state information between primary user's emitter and secondary customer objective node ej, obtain reception Signal to Interference plus Noise Ratio δ of each relaying in secondary customer objective nodei；
(8) method based on distributed timer is by 1/ δ in timeriBe kept at first 0 via node elect as it is optimal in After rb, and the orthogonal duplicate of the secondary user's source node identification after being recompiled by its forwarding is to secondary customer objective node；
(9) secondary customer objective node merges secondary user's source node letter that two time slots are received using Maximal ratio combiner method Number, complete cognitive quadrature-synergy transmission.
The present invention has compared with prior art advantages below：
1st, the present invention considers the cognitive quadrature-synergy transmission existed when primary user disturbs, and selects under primary user's communication constraint Select optimum relaying and send quadrature information, can meet than the existing collaborative transmission method for not considering that primary user's communication is limited Family outage probability realizes time user collaboration communication on the premise of requiring.
2nd, the present invention uses relay cooperative transmission, by sharing mutual antenna between different transmission nodes so that single Antenna node can also obtain the space diversity gain of multi-antenna node, while avoiding multiple antennas spatial coherence to systematicness The impact of energy, and then the performance and capacity of system are improve, broadband cellular network is not only suitable for, and it is adapted to Wireless Ad-Hoc nets Network and radio sensing network.
3rd, the present invention decides whether using relaying during whole cooperative transmission according to direct transmission link channel quality Cooperative transmission, had both met the requirement of communication quality, and transmit power is saved again.
Description of the drawings
Fig. 1 is the cognitive cooperative transmission junction network illustraton of model that the present invention is used；
Fig. 2 is the flowchart of the present invention；
Fig. 3 is that the present invention has change song of outage probability when multiple primary users disturb with system signal noise ratio SNR γ Line；
Fig. 4 is the present invention in the relation that there is outage probability when multiple primary users disturb and primary user's emitter number N；
Fig. 5 is the present invention in the relation that there is outage probability when multiple primary users disturb and primary user receiver number M；
Fig. 6 is that the present invention has change song of outage probability when multiple primary users disturb with primary user interruption thresholding ξ Line.
Specific embodiment
As shown in figure 1, the submarine cognition cooperative transmission under Rayleigh fading environment and when there is primary user's interference is relayed Network, including primary user's network and time user network.Wherein, primary user's network is by N number of primary user's emitter ujWith M primary user Receiver vqComposition, 1≤q≤M, 1≤j≤N；Secondary user network is by s, K via node r of secondary user's source nodeiAnd secondary user's mesh Node d composition, 1≤i≤K.
In secondary user network, secondary user's source node s is attempted by between secondary user's source node and secondary customer objective node Direct link or select to cooperate decoding with K, the help of forward relay communicates with secondary customer objective node.Solid line table in Fig. 1 Show time transmission link of user's source node, dotted line represents the transmission link of primary user's emitter, and pecked line represents via node Transmission link.All nodes are equipped with single omni and are operated in semiduplex mode in network, and whole Cognitive-Cooperation relaying is passed Defeated process is divided into two time slots.It is that 0, variance is N to assume that the ambient noise of receiver obeys average0Additive white Gaussian noise.
In the present invention, according to the channel quality condition between secondary user's source node and secondary customer objective node, self adaptation Ground selects directly transmission or relay transmission.In the first time slot of transmission, secondary user source node broadcasts information is to time customer objective section Point and all of via node, according to the reception Signal to Interference plus Noise Ratio of secondary customer objective node, secondary customer objective node decides whether to need Want relay node cooperation transmission time user's source node identification.If the reception Signal to Interference plus Noise Ratio of secondary customer objective node exceedes thresholding γs'=2Rs- 1, then secondary customer objective node sends the feedback information of affirmative, and secondary user's source node is in ensuing time slot Send new information, wherein RsRepresent the transfer rate of time user；Otherwise, secondary customer objective node sends the feedback letter of negative Breath, and the second time slot in Cognitive-Cooperation relay transmission selects one from can be correctly decoded time user's source node identification relaying Best relay forwarding time user's source node identification is to secondary customer objective node.For latter event, secondary customer objective node is adopted Merge the secondary user source node signal that two time slots are received with Maximal ratio combiner method.
With reference to Fig. 1, there is the cognitive quadrature-synergy transmission that carries out when primary user disturbs in the present invention based on above-mentioned network Step is comprising as follows：
Step 1, secondary user's source node s determines transmission power P of oneselfs, and broadcast pilot.
(1a) secondary user's source node s is by frequency range management equipment between primary user and secondary user or need not feed back Channel estimator estimates oneself and primary user receiver vqBetween instantaneous channel state information aq；
(1b) according to instantaneous channel state information a estimatedq, secondary user's source node s determines transmission power Ps：
In formula,M represents primary user's receiver number, and ξ is represented in primary user Maximum outage probability in the transmission of disconnected thresholding, i.e. primary user,Wherein RpRepresent the transfer rate of primary user, N0 Represent the variance of receiver additive white Gaussian noise, PqRepresent primary user receiver vqThe transmission power of corresponding emitter, Represent primary user receiver vqCorresponding emitter and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Represent time user's source node s and primary user receiver vqBetween instantaneous channel state information aqRayleigh fading coefficient side Difference.
(1c) secondary user's source node is with transmission power PsBroadcast pilot.
Step 2, secondary customer objective node is estimated to receive Signal to Interference plus Noise Ratio εjAnd the signal that decoding is received.
Due to the signal that secondary customer objective node is received it is also primary in addition to the pilot signal of secondary user source node broadcasts The signal that family emitter sends, it is therefore desirable to estimate the instantaneous channel state between primary user's emitter and secondary customer objective node Information.
(2a) a is obtained using middle with step (1a)qIdentical method or by intercept primary user's emitter transmission lead Frequency signal, estimates instantaneous channel state information e between primary user's emitter and secondary customer objective nodej；
(2b) secondary customer objective node is according to the signal quality and instantaneous channel state information e for receivingjEstimate oneself Receive Signal to Interference plus Noise Ratio εj；
(2c) secondary customer objective node is according to the Signal to Interference plus Noise Ratio ε for estimatingjThe signal that decoding is received.
Step 3, secondary customer objective node is circulated redundancy check to decoded signal.
Time user's source node and time customer objective node agreement generator polynomial when transmission starts, if decoded code word The generator polynomial that multinomial can be arranged divides exactly and then verify successfully, shows time between user's source node and secondary customer objective node Direct transmission channel quality preferably do not need relay node cooperation transmission, secondary user's source node start send data；Otherwise school Test failure, execution step 4.
Step 4, via node is estimated to receive Signal to Interference plus Noise Ratio γiAnd the signal that decoding is received.
The signal that via node is received also has the signal that primary user's emitter sends in addition to the signal of secondary user's source node, Therefore need to estimate the instantaneous channel state information between primary user's emitter and via node.
(4a) via node adopts and e is obtained in step (2a)jIdentical method estimates primary user's emitter with relaying section Instantaneous channel state information between point；
(4b) via node is according to the instantaneous letter between the signal quality and primary user's emitter and via node for receiving Channel state information estimates the reception Signal to Interference plus Noise Ratio γ of oneselfi, 1≤i≤K；
(4c) via node is according to the reception Signal to Interference plus Noise Ratio γ for oneself estimatingiThe signal that decoding is received.
Step 5, all of via node is circulated redundancy check to decoded signal.
Time user's source node and via node agreement generator polynomial when transmission starts, if decoded codeword polynome The generator polynomial that can not be arranged divides exactly, then be considered as decoding failure, and via node no longer forwards source node identification to secondary user Destination node；If can divide exactly, it is considered as successfully decoded, execution step (6).
Step 6, via node is with transmission power PiPilot signal transmitted, secondary customer objective node reverts back answer signal；
(6a) via node adopts and a is obtained in step (1a)qIdentical method estimate oneself with primary user's receiver it Between channel condition information fiq；
(6b) according to the channel condition information estimated, via node determines transmission power Pi：
In formula,M represents primary user's receiver number, and ξ is represented in primary user Maximum outage probability in the transmission of disconnected thresholding, i.e. primary user,Wherein RpRepresent the transfer rate of primary user, N0 Represent the variance of receiver additive white Gaussian noise, PqRepresent primary user receiver vqThe transmission power of corresponding emitter, Represent primary user receiver vqCorresponding emitter and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Represent via node riWith primary user receiver vqBetween channel condition information fiqRayleigh fading coefficient variance；
(6c) via node is with transmission power PiPilot signal transmitted is to time customer objective node；
(6d) secondary customer objective node replys an answer signal after the pilot signal for receiving via node transmission；
Step 7, each via node of successfully decoded obtains oneself reception Signal to Interference plus Noise Ratio δ in secondary customer objective nodei。
(7a) via node estimates it with secondary customer objective node according to time answer signal of customer objective node is received Between channel condition information hi；
(7b) via node combines channel condition information hiAnd the wink between primary user's emitter and secondary customer objective node When channel condition information ej, obtain reception Signal to Interference plus Noise Ratio δ of each relaying in secondary customer objective nodei：
In formula, PiRepresent time user via node riTransmission power, hiRepresent via node riWith secondary customer objective node Between channel condition information, PjRepresent primary user emitter ujTransmission power, εjRepresent primary user emitter ujWith secondary user Channel condition information between destination node d, N0Represent the variance of receiver additive white Gaussian noise.
Step 8, selects the orthogonal duplicate of best relay decoding forwarding source node identification.
Method based on distributed timer is by 1/ δ in timeriThe via node for being kept to 0 at first elects best relay r asb, Best relay rbTime user's source node identification is recompiled, and the orthogonal duplicate of the information is forwarded into time customer objective node.
Step 9, secondary user's source node that secondary customer objective node is received two time slots using Maximal ratio combiner method Signal is merged, and completes cognitive quadrature-synergy transmission.
The effect of the present invention can be further illustrated by emulation：
A, simulated conditions
Assume Pj=Pq=Pu, 1≤q≤M, 1≤j≤N, 1≤i≤K, wherein,Represent that primary user receives Machine vqCorresponding emitter and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Represent time user source Node s and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Represent via node riConnect with primary user Receipts machine vqBetween Rayleigh channel fading coefficients variance,Represent time user's source node s and via node riRayleigh channel The variance of fading coefficients,Represent secondary Rayleigh channel fading coefficients between user's source node s and secondary customer objective node d Variance,Represent via node riThe variance of the Rayleigh channel fading coefficients between secondary customer objective node d,Represent master User transmitter ujWith via node riBetween Rayleigh channel fading coefficients variance,Represent primary user emitter ujWith The variance of the Rayleigh channel fading coefficients between secondary customer objective node d, PjRepresent primary user emitter ujTransmission power, Pq Represent primary user receiver vqTransmission power.
Assume the average channel gain of primary user's transmission link, secondary user's direct link and repeated link WithIt is relatively large, and secondary user node and primary user's node and primary user's node and secondary user node it Between average channel gainWithIt is relatively small.
The existing method that emulation is used has three kinds：1. the direct transmission between time user's source node and secondary customer objective node Selection cooperating relay transmission when link is unavailable, is abbreviated as without direct link scene；2. time user's source node and secondary user's mesh Node between direct transmission link it is available and the selection cooperation of the signal that time customer objective node is received is merged using SC Relay transmission, is abbreviated as SC；3. time customer objective node is received using the direct transmission link of MRC merga pass signal and lead to The selection cooperating relay transmission of the signal that repeated link is received is crossed, MRC is abbreviated as.
B, emulation content
Emulation 1：In system SNR γ=1/N0Under conditions of change, take Pu=3dB, Rp=1bit/s/Hz, Rs=1bit/s/Hz,ξ =0.1, K=3, N=2, M=2, the outage probability for emulating three kinds of methods of the invention and existing is bent with the change that system SNR is produced Line, as a result as shown in Figure 3.
Emulation 2：When primary user's emitter number is 2 and 8, take Pu=3dB, Rp=1bit/s/Hz, Rs=1bit/s/Hz,ξ =0.1, K=6, M=2, emulate primary user's emitter number of variations and the outage probability of of the invention and existing three kinds of methods are produced Impact, as a result as shown in Figure 4.
Emulation 3：When primary user's receiver number is 2 and 8, take Pu=3dB, Rp=1bit/s/Hz, Rs=1bit/s/Hz,ξ =0.1, K=6, N=2, emulate primary user's receiver number of variations and the outage probability of of the invention and existing three kinds of methods are produced Impact, as a result as shown in Figure 5.
Emulation 4：Under the interruption thresholding ξ situations of change of primary user, take Pu=3dB, Rp=1bit/s/Hz, Rs=1bit/s/Hz, N0=0dB, K=3, N=2, M=2, emulate the interrupt change song that thresholding ξ produce of the outage probability with primary user of three kinds of methods of the invention and existing Line, as a result as shown in Figure 6.
C, simulation result
As seen from Figure 3, with the increase of SNR γ, when γ is relatively small, the outage probability of cognitive user reduces therewith, However, when γ is relatively large, the outage probability of cognitive user is held essentially constant.As can be seen that secondary user's direct link Can be with the interruption performance of scene better than time outage probability of the unavailable scene of user's direct link, four kinds of selection cooperating relay transmissions The best performance of the present invention in strategy.This is because, by merge that time customer objective node receives using folding come Signal from secondary user's direct link and the signal from repeated link strengthen time received signal strength of customer objective node. The simulation result and asymptotic result of outage probability are given in Fig. 3, and simulation result and theoretical analysis result are completely superposed, it is high The asymptotic value in SNR regions is with theoretical value closely.
From fig. 4, it can be seen that the reception when the number of primary user's emitter increases, to via node and time customer objective node Signal brings more interference, thus causes the performance of cognitive user and reduces.Additionally, by examine it is found that In the more scene of primary user's receiver number, the better performances of the present invention.
As seen from Figure 5, when the number of primary user's receiver increases, the transmission power of transmitting node is received in secondary user network To tightened up restriction, therefore, the outage probability of cognitive user increases.It is identical with Fig. 4, using the selection cooperating relay of MRC Outage probability difference between transmission and quadrature-synergy transmission increases with the increase of primary user's receiver number, comparatively speaking originally The better performances of invention.
As seen from Figure 6, the Outage probability of distributed antenna of cognitive user increases as primary user disturbs the decrease for limiting, that is, recognize Know that the outage probability of time user reduces as primary user interrupts the increase of thresholding ξ；Simultaneously it can also be seen that in given primary user Interrupt gate prescribe a time limit, the average channel gain between the corresponding receiver of primary user's emitterIt is bigger, cognitive use The outage probability at family is less, this be due to cognitive user transmission power withIncrease and increase, comparatively speaking still It is the better performances of the present invention.
Comprehensive, in the cognitive quadrature-synergy transmission existed when primary user disturbs, its performance is better than existing for the inventive method Method.

Claims (4)

1. a kind of cognitive quadrature-synergy transmission method existed when primary user disturbs, comprises the steps：
(1) secondary user's source node s estimates oneself and primary user receiver vqBetween instantaneous channel state information aq, determine oneself Transmission power Ps, and with transmission power PsBroadcast pilot, 1≤q≤M, M represents primary user's receiver number；
(2) secondary customer objective node d estimates the instantaneous channel state information between primary user's emitter and secondary customer objective node ej, while estimating that it receives Signal to Interference plus Noise Ratio ε according to the signal quality for receivingj, and according to the Signal to Interference plus Noise Ratio ε for estimatingjDecoding is received The signal for arriving, 1≤j≤N, N represents the emitter number of primary user；
(3) secondary customer objective node is circulated redundancy check to decoded signal, secondary user's source node if verifying successfully Start to send data；If verification failure, execution step 4；
(4) all of via node is estimated to receive Signal to Interference plus Noise Ratio γ according to the pilot signal of the secondary user's source node for receivingi, and According to the reception Signal to Interference plus Noise Ratio γ that oneself is estimatediThe signal that decoding is received, 1≤i≤K, K represents via node number；
(5) all of via node is circulated redundancy check to decoded signal：
If not over verification, being considered as decoding failure, via node no longer forwards source node identification to secondary customer objective node；
If by verification, being considered as successfully decoded, execution step (6)；
(6) via node estimates oneself and the channel condition information f between primary user's receiveriq, determine transmission power Pi, and with Transmission power PiPilot signal transmitted is receiving leading for via node transmission to time customer objective node, secondary customer objective node An answer signal is replied after frequency signal；
(7) each via node estimates it between secondary customer objective node according to time answer signal of customer objective node is received Channel condition information hi, and with reference to instantaneous channel state information e between primary user's emitter and secondary customer objective nodej, obtain To each reception Signal to Interference plus Noise Ratio δ relayed in secondary customer objective nodei；
(8) method based on distributed timer is by 1/ δ in timeriThe via node for being kept to 0 at first elects best relay r asb, And the orthogonal duplicate of the secondary user's source node identification after being recompiled by its forwarding is to secondary customer objective node；
(9) secondary customer objective node merges the secondary user source node signal that two time slots are received using Maximal ratio combiner method, Complete cognitive quadrature-synergy transmission.
2. it is according to claim 1 exist primary user disturb when cognitive quadrature-synergy transmission method, wherein in step (1) It is determined that transmission power P of secondary user's source node ss, choose by following formula：
P s = m a x [ P q σ q 2 Ξ 1 γ p σ s q 2 , 0 ]
In formula,M represents primary user's receiver number, and ξ represents the interrupt gate of primary user Maximum outage probability in the transmission of limit, i.e. primary user,Wherein RpRepresent the transfer rate of primary user, N0Represent The variance of receiver additive white Gaussian noise, PqRepresent primary user receiver vqThe transmission power of corresponding emitter,Represent Primary user receiver vqCorresponding emitter and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Table Show time user's source node s and primary user receiver vqBetween Rayleigh channel fading coefficients variance.
3. it is according to claim 1 exist primary user disturb when cognitive quadrature-synergy transmission method, wherein in step (6) It is determined that secondary user's via node riTransmission power Pi, choose by following formula：
P i = m a x [ P q σ q 2 Ξ 2 γ p σ i q 2 , 0 ]
In formula,M represents primary user's receiver number, and ξ represents the interrupt gate of primary user Maximum outage probability in the transmission of limit, i.e. primary user,Wherein RpRepresent the transfer rate of primary user, N0Represent The variance of receiver additive white Gaussian noise, PqRepresent primary user receiver vqThe transmission power of corresponding emitter,Represent Primary user receiver vqCorresponding emitter and primary user receiver vqBetween Rayleigh channel fading coefficients variance,Table Show via node riWith primary user receiver vqBetween Rayleigh channel fading coefficients variance.
4. it is according to claim 1 exist primary user disturb when cognitive quadrature-synergy transmission method, wherein in step (7) Reception Signal to Interference plus Noise Ratio δ of each relaying in secondary customer objective nodei, obtained by following formula：
δ i = P i | h i | 2 Σ n = 1 N P j | ϵ n | 2 + N 0
In formula, PiRepresent time user via node riTransmission power, hiRepresent via node riBetween secondary customer objective node Channel condition information, PjRepresent primary user emitter ujTransmission power, εjRepresent primary user emitter ujWith secondary customer objective Channel condition information between node d, N0Represent the variance of receiver additive white Gaussian noise.
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