CN106301630B - A kind of anti-interference frequency spectrum access method based on beam forming - Google Patents

A kind of anti-interference frequency spectrum access method based on beam forming Download PDF

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CN106301630B
CN106301630B CN201610619960.5A CN201610619960A CN106301630B CN 106301630 B CN106301630 B CN 106301630B CN 201610619960 A CN201610619960 A CN 201610619960A CN 106301630 B CN106301630 B CN 106301630B
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user
cognitive
transmitting terminal
authorized user
cognitive user
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CN106301630A (en
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卢为党
汪燕冰
王梦云
彭宏
徐志江
华惊宇
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • 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
    • H04B7/0617—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 for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A kind of anti-interference frequency spectrum access method based on beam forming, in the method, the frequency spectrum of cognitive user insertion authority user cooperatively helps the information for forwarding authorized user by way of decoding forwarding.If cognitive user can help authorized user to reach targeted rate, authorized user will bandwidth allocation and part-time to cognitive user, so that its is accessed frequency spectrum.Otherwise cognitive user can not access, and authorized user, which direct transfers, sends oneself information.In second time slot, the method that cognitive user uses close-to zero beam forming using multiple antennas helps the information for forwarding authorized user to reach targeted rate, and sends self information with remaining power using a part of power.The present invention effectively eliminates the problem of interfering with each other between authorized user and cognitive user, promotes user performance.

Description

A kind of anti-interference frequency spectrum access method based on beam forming
Technical field
The invention belongs to the cognition wireless technical field of telecommunications in wireless communication field, especially a kind of frequency spectrum access side Method.
Background technique
With the high speed development of wireless communication, frequency spectrum resource becomes more and more rare.Federal Communications Commission (FCC) Numerous studies report show that the utilization rate of current wireless frequency spectrum is very low, only 15%~85%.Wherein frequency spectrum resource distributes not It is a critically important factor.Existing static spectral resource distribution mode causes to will cause when the section entitlement band subscriber free time The waste of frequency spectrum resource, rather than authorized spectrum band is then abnormal crowded.Cognitive radio technology can perceive and utilize ambient enviroment sky Ideler frequency spectrum, the access frequency spectrum so that unauthorized user is had the ability.Mutiple antennas is installed in transmitting terminal and receiving end, so that signal Transmitted by the mutiple antennas of transmitting terminal and receiving end, communication quality can be improved, can not increase frequency spectrum resource and System channel capacity is improved in the case where transmission power.
It is coexisted in formula frequency spectrum access method in the existing cognitive radio based on multiple antennas, cognitive user insertion authority frequency spectrum The information for sending authorized user and oneself simultaneously using identical frequency spectrum afterwards can exist dry between authorized user and cognitive user It disturbs, so that being not fully utilized originally with regard to very limited frequency spectrum resource, the performance of authorized user and cognitive user also can be by It is affected in interference.
Summary of the invention
In order to overcome existing formula frequency spectrum access technology coexists can not solve authorized user and cognitive user based on multiple antennas Between interference problem deficiency, the present invention, which provides, a kind of effectively eliminates asking of interfering with each other between authorized user and cognitive user The anti-interference frequency spectrum access method based on beam forming of topic.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of anti-interference frequency spectrum access method based on beam forming, communication system are by a main system and a cognition System composition, wherein main system includes authorized user's transmitting terminal and authorized user receiving end, and the main system is supported relay function, had The authorization frequency spectrum of one section of W bandwidth composition；Cognitive system includes cognitive user transmitting terminal and cognitive user receiving end, wherein cognition is used Family transmitting terminal is equipped with mutiple antennas, and the cognitive system can simulate radio protocol and system parameter in main system；Institute State the anti-interference frequency spectrum access method based on beam forming the following steps are included:
1) for cognitive user with the frequency spectrum of cooperation mode insertion authority user, cognitive user receives the information of authorized user Afterwards, help to send the information of authorized user to authorized user receiving end by decoding forward collaboration mode；
2) the rate R obtained after authorized user is helped by cognitive user cooperation is calculatedP；
If 3) RP≥RT, then authorized user will distribute half the time to cognitive user, it is authorized to access the frequency of oneself It composes, after cognitive user insertion authority user's frequency spectrum, uses close-to zero beam shaping Algorithm using multiple antennas, distribute a part of power Authorization user information is forwarded, the information of oneself is sent using remaining power；Otherwise authorized user sends oneself by direct transferring Information；
Beam forming and power distribution problems modeling between authorized user and cognitive user are as follows:
Meet the following conditions
Wherein, RTIndicate the targeted rate of authorized user, f1, f2Indicate beam forming vector, PSIndicate that cognitive user is sent Hold general power, P1, P2Indicate power allocation factor, RPAnd RSAfter respectively indicating cognitive user insertion authority frequency spectrum, authorized user and The rate that cognitive user obtains.
Beamforming matrix is obtained by close-to zero beam shaping Algorithm:
Wherein, H=[h1 H h2 H]H, h1And h2Cognitive user transmitting terminal is respectively indicated to use to authorized user receiving end and cognition Family transmitting terminal is to cognitive user receiving end link multiple antenna channel coefficient matrix, F=[f1 f2] be cognitive user transmitting terminal wave Beam shaping matrix；
Optimal power allocation is obtained by Mathematics Optimization Method:
Wherein, W indicates authorized bandwidth, σ1 2Indicate cognitive user transmitting terminal to the noise side of authorized user receiving end link Difference.
Further, in the step 3), cognitive user passes through two slot decoder forward collaboration mode insertion authority users Frequency spectrum eliminates the common-channel interference of authorized user and cognitive user using close-to zero beam shaping Algorithm；
In first time slot, half sending time is occupied, authorized user sends information to cognitive user transmitting terminal, and authorization is used Rate of the family transmitting terminal to cognitive user transmitting terminal link are as follows:
Wherein, h3Indicate authorized user's transmitting terminal to cognitive user transmitting terminal link multiple antenna channel coefficient matrix, PPIt indicates Authorized user's transmitting terminal power, σ3 2Noise variance of authorized user's transmitting terminal to cognitive user transmitting terminal link.
In second time slot, occupy the other half time, cognitive user transmitting terminal using oneself multiple antennas using wave beam at Shape algorithm sends information to authorized user receiving end and cognitive user receiving end simultaneously, and authorized user and cognitive user are at second The rate that time slot obtains is respectively as follows:
Wherein σ2 2Indicate cognitive user transmitting terminal to cognitive user receiving end link noise variance；
So authorized user passes through the rate obtained after two time slots are as follows:
RP=min { R1,R3} (9)。
Technical concept of the invention are as follows: since multiple antennas coexists in formula frequency spectrum access method, cognitive user and authorized user It is communicated simultaneously using identical frequency spectrum, there is interference with each other, frequency efficiency is limited, and user performance is insufficient.This patent The frequency spectrum of cognitive user insertion authority user by way of cooperation in method, after cognitive user insertion authority user's frequency spectrum, Using multiple antennas close-to zero beam shaping Algorithm, a part of power forwarding authorization user information is distributed, is sent using remaining power The information of oneself can effectively solve the problem that the interference problem between authorized user and cognitive user.
Beneficial effects of the present invention are mainly manifested in: (1) eliminating multiple antennas and authorization use in formula frequency spectrum access method coexists The interference problem at family and cognitive user；(2) performance of authorized user and cognitive user is improved.
Detailed description of the invention
Fig. 1 is frequency spectrum access model schematic diagram of the invention.
Fig. 2 is variation diagram of the cognitive user rate with d, and wherein d is authorized user's transmitting terminal to cognitive user transmitting terminal Distance；
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Figures 1 and 2, a kind of anti-interference frequency spectrum access method based on beam forming is logical based on existing radio What letter system was realized, the radio communications system is made of a main system and a cognitive system, and wherein main system includes Authorized user's transmitting terminal and authorized user receiving end, the main system support relay function, the authorization frequency being made of one section of W bandwidth Spectrum.Cognitive system includes cognitive user transmitting terminal and cognitive user receiving end, and wherein cognitive user transmitting terminal is equipped with multiple days Line, the cognitive system can simulate radio protocol and system parameter in main system.
In the method for present embodiment, cognitive user is with the frequency spectrum of cooperation mode insertion authority user.Cognitive user receives To after the information of authorized user, the information for sending authorized user is helped to receive to authorized user by decoding forward collaboration mode End.If the rate R that authorized user obtains after being helped by cognitive user cooperationPMore than or equal to the targeted rate R of oneselfT, i.e. RP ≥RT, then authorized user will distribute half transmission time to cognitive user, it is authorized to access the frequency spectrum of oneself, and cognitive user connects After the frequency spectrum for entering authorized user, close-to zero beam shaping Algorithm is used using multiple antennas, distributes a part of power forwarding authorized user Information sends the information of oneself using remaining power.Otherwise, authorized user, which continues through to direct transfer, sends the information of oneself.
The rate R that authorized user and cognitive user obtain after cognitive user insertion authority user's frequency spectrum in present embodimentP And RSIt can be prepared by the following:
Cognitive user decodes the frequency spectrum of forward collaboration mode insertion authority user by two time slots.In first time slot, The time of half is occupied, PT sends information to ST with whole W bandwidth.So authorized user's transmitting terminal is to cognitive user transmitting terminal chain The rate on road are as follows:
Wherein, PPIndicate the transmission power of authorized user, h3Indicate authorized user's transmitting terminal to cognitive user transmitting terminal link Multi-antenna channel coefficient matrix, σ3 2Noise variance of the expression authorized user's transmitting terminal to cognitive user transmitting terminal link.
In second time slot, the time of half is occupied, ST forwards the information to PR simultaneously using close-to zero beam shaping Algorithm Send oneself information, rate of the cognitive user transmitting terminal to authorized user receiving end are as follows:
Wherein, f1,f2For beamforming vectors, P1,P2For power allocation factor, h1Indicate cognitive user transmitting terminal to authorization User receiving end link multiple antenna channel coefficient matrix, σ1 2Indicate cognitive user transmitting terminal making an uproar to authorized user receiving end link Sound variance.So authorized user can be indicated by the rate that two time slots obtain with the help of cognitive user are as follows:
RP=min { R1,R3} (9)
Cognitive user obtains rate are as follows:
Wherein h2Indicate cognitive user transmitting terminal to cognitive user receiving end link multiple antenna channel coefficient matrix, σ2 2It indicates Cognitive user transmitting terminal is to cognitive user receiving end link noise variance.
Beamforming vectors and power distribution method in present embodiment specifically:
Beam forming and power distribution problems modeling between authorized user and cognitive user are as follows:
Meet the following conditions
Beam forming matrix are obtained by close-to zero beam shaping Algorithm:
Wherein, H=[h1 H h2 H]H, F=[f1f2] be cognitive user transmitting terminal beamforming matrix.
Optimal power allocation is obtained by Mathematics Optimization Method:
By P2, f1, f2Bring to obtain cognitive system maximum rate into are as follows:
The anti-interference frequency spectrum access method based on beam forming of the present embodiment, can effectively eliminate multiple antennas and formula frequency coexists Compose the interference problem of authorized user and cognitive user in cut-in method.
In the frequency spectrum access method of this implementation, cognitive user is accessed under conditions of meeting authorized user in second time slot The frequency spectrum of authorized user.Cognitive user sends itself letter while forwarding authorization user information using the multiple antennas help of oneself Breath, while close-to zero beam shaping Algorithm is used, interference will not be generated from each other.In the present embodiment, it is assumed that PT, PR, ST With SR all in X-axis, wherein PT and PR is in (1,0) and (0,0).ST is moved in X positive axis, and SR is in the centre of PR and ST.If ST to PT distance is d, and ST is equipped with 4 antennas, path attenuation index v=3, RT=3bps/Hz, PP/N0=8dB, Ps/N0= 10dB, system bandwidth W=1.
The frequency spectrum access method of the present embodiment improves the performance of authorized user and cognitive user.Use is shown in Fig. 2 The rate of cognitive user after frequency spectrum access method of the invention, it can be seen that using after frequency spectrum access method of the invention, protecting Under the premise of demonstrate,proving authorized user's rate, cognitive user has access to frequency spectrum in very large range and obtains good transmission rate.

Claims (2)

1. a kind of anti-interference frequency spectrum access method based on beam forming, communication system is by a main system and a cognitive system Composition, wherein main system includes authorized user's transmitting terminal and authorized user receiving end, and the main system supports relay function, there is one The authorization frequency spectrum of section W bandwidth composition；Cognitive system includes cognitive user transmitting terminal and cognitive user receiving end, wherein cognitive user Transmitting terminal is equipped with mutiple antennas, and the cognitive system can simulate radio protocol and system parameter in main system；It is special Sign is: the anti-interference frequency spectrum access method based on beam forming the following steps are included:
1) cognitive user is with the frequency spectrum of cooperation mode insertion authority user, after cognitive user receives the information of authorized user, leads to It crosses decoding forward collaboration mode and helps to send the information of authorized user to authorized user receiving end；
2) the rate R obtained after authorized user is helped by cognitive user cooperation is calculatedP；
If 3) RP≥RT, then authorized user will distribute half the time to cognitive user, authorize it to access the frequency spectrum of oneself, recognize After knowing user access authorization user's frequency spectrum, close-to zero beam shaping Algorithm is used using multiple antennas, distributes a part of power forwarding Authorization user information sends the information of oneself using remaining power；Otherwise authorized user sends the information of oneself by direct transferring；
Beam forming and power distribution problems modeling between authorized user and cognitive user are as follows:
Meet the following conditions
Wherein, RTIndicate the targeted rate of authorized user, f1, f2Indicate beam forming vector, PSIndicate that cognitive user transmitting terminal is total Power, P1, P2Indicate power allocation factor, RPAnd RSAfter respectively indicating cognitive user insertion authority frequency spectrum, authorized user and cognition The rate that user obtains；
Beamforming matrix is obtained by close-to zero beam shaping Algorithm:
Wherein, H=[h1 H h2 H]H, h1And h2Cognitive user transmitting terminal is respectively indicated to send out to authorized user receiving end and cognitive user Sending end is to cognitive user receiving end link multiple antenna channel coefficient matrix, F=[f1 f2] be cognitive user transmitting terminal wave beam at Shape matrix；
Optimal power allocation is obtained by Mathematics Optimization Method:
Wherein, W indicates authorized bandwidth, σ1 2Noise variance of the expression cognitive user transmitting terminal to authorized user receiving end link.
2. a kind of anti-interference frequency spectrum access method based on beam forming as described in claim 1, it is characterised in that: the step It is rapid 3) in, cognitive user is shaped by two slot decoder forward collaboration mode insertion authority user's frequency spectrums using close-to zero beam The common-channel interference of algorithm elimination authorized user and cognitive user；
In first time slot, authorized user sends information to cognitive user transmitting terminal, and authorized user's transmitting terminal to cognitive user is sent out The rate of sending end link are as follows:
Wherein, h3Indicate authorized user's transmitting terminal to cognitive user transmitting terminal link multiple antenna channel coefficient matrix, PPIndicate authorization User's transmitting terminal power, σ3 2Noise variance of authorized user's transmitting terminal to cognitive user transmitting terminal link；
In second time slot, cognitive user transmitting terminal is using the multiple antennas of oneself using beamforming algorithm simultaneously to authorized user Receiving end and cognitive user receiving end send the rate difference that information, authorized user and cognitive user are obtained in second time slot Are as follows:
Wherein σ2 2Indicate cognitive user transmitting terminal to cognitive user receiving end link noise variance；So authorized user passes through two The rate obtained after time slot are as follows:
RP=min { R1,R3} (9)。
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CN103987050A (en) * 2014-04-14 2014-08-13 浙江工业大学 Anti-interference frequency spectrum access method based on full duplex OFDM cooperation
CN104202277A (en) * 2014-08-21 2014-12-10 广东工业大学 Design method for secondary user network linear transceiver with cognitive relay network
CN104270821A (en) * 2014-07-16 2015-01-07 浙江工业大学 Anti-interference spectrum access method based on user fairness
CN105392143A (en) * 2015-11-17 2016-03-09 浙江工业大学 Authorized user and cognitive user QoS guaranteed frequency spectrum access method based on power allocation

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN103987050A (en) * 2014-04-14 2014-08-13 浙江工业大学 Anti-interference frequency spectrum access method based on full duplex OFDM cooperation
CN104270821A (en) * 2014-07-16 2015-01-07 浙江工业大学 Anti-interference spectrum access method based on user fairness
CN104202277A (en) * 2014-08-21 2014-12-10 广东工业大学 Design method for secondary user network linear transceiver with cognitive relay network
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