CN105704721B - A kind of D2D-P multiplexing cellular network communication methods improving the availability of frequency spectrum - Google Patents

A kind of D2D-P multiplexing cellular network communication methods improving the availability of frequency spectrum Download PDF

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CN105704721B
CN105704721B CN201610019020.2A CN201610019020A CN105704721B CN 105704721 B CN105704721 B CN 105704721B CN 201610019020 A CN201610019020 A CN 201610019020A CN 105704721 B CN105704721 B CN 105704721B
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matrix
cellular network
interference
phone user
rows
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CN105704721A (en
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李莉
王欢
王珍
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Shanghai Normal University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • 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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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a kind of D2D-P improving the availability of frequency spectrum to be multiplexed cellular network communication method, includes the following steps：S1 establishes cellular network；S2, according to Hk,m, using interference alignment method, acquire each D2D-PmN rows, d row pre-coding matrixes FmDisaggregation；S3 calculates D2D-PmTo CUkInterference matrix Hk,mFm, design and be orthogonal to Hk,mFmN rows, d row phone user's postposition encoder matrix Wk；S4 is aligned method using based on the interference for minimizing mean square error, acquires all D2D-PmTransmitter pre-coding matrix FmWith receiver postposition encoder matrix Gm, and communicated；D2D-P is arranged in S5mSINR threshold values ωth, adjudicate D2D-PmWhether cellular network is accessed；S6, using improved water injection power distribution method to all D2D-PmDistribute transmission power；S7, according to step S2~S6's as a result, being communicated.Compared with prior art, the present invention snaps to D2D-P at phone user the interference of phone user, ensure that the communication priority of phone user, controls interfering with each other between D2D-P, improves D2D-P and rate.

Description

A kind of D2D-P multiplexing cellular network communication methods improving the availability of frequency spectrum
Technical field
The present invention relates to a kind of cellular network communication methods, multiple more particularly, to a kind of D2D-P improving the availability of frequency spectrum With cellular network communication method.
Background technology
With the fast development of wireless communication, how in the case of limited frequency spectrum resource, frequency spectrum is maximumlly utilized Resource has been a hot spot of research.In cellular networks, equipment is added in cellular network (D2D-P) equipment user It is multiplexed its frequency spectrum resource, the availability of frequency spectrum can be improved, but inevitable interference can be brought to phone user, influence phone user The performance indicators such as transmission rate.
Not high and the problems such as D2D-P interferes cellular network, the Daquan for cellular network frequency spectrum resource utilization rate Feng et al. (Daquan Feng, Lu Lu, Yi Yuan-Wu, Geoffrey Ye Li, Gang Feng, Shaoqian Li.Device-to-Device Communications Underlaying Cellular Networks,IEEE TRANSACTIONS ON COMMUNICATIONS, VOL.61, NO.8, pp.3541-3551, AUGUST 2013) propose it is as follows Method：By the way that threshold value is previously set, satisfactory D2D-P is selected, then uses and distributes power to potential phone user Finally suitable user is selected in potential phone user and is coordinated with satisfactory D2D-P with satisfactory D2D-P, By the D2D-P of selection OK range, cellular network coverage area, the number of active phone user and D2D-P, system is maximized The throughput gain and access rate of system.Such method is limited in cellular network uplink, only ensure that partial cell user Communication requirement, the interference etc. that brings of cellular network is added without specifically eliminating D2D-P.
Lu Yang et al. (Lu Yang, Wei Zhang, Shi Jin, " Interference Alignment in Device-to-Device LAN Underlaying Cellular Networks”,IEEE TRANSACTIONS ON WIRELESS COMMUICATIONS, VOL.14, NO.7, PP.3715-3723, JULY, 2015.) interference alignment algorithm is used, It solves to interfere caused by D2D-P Reusespectrum resources, method is as follows：(1) when the uplink of base station is not used by honeycomb completely When family occupies, D2D-P snaps in these idle links the interference of phone user, to make phone user from interference； (2) when base station uplink is fully occupied, D2D-P can occupy part uplink, and interference threshold is arranged at this time, will occupy Link interference control under threshold value, the interference to phone user is controlled with this.Although the method eliminates D2D-P to bee The interference of nest user's communication link, but when phone user is more, interference caused by D2D-P cannot completely eliminate, and after access D2D-P quantity and its performance indicators such as transmission rate do not account for, the interruption that only considered D2D-P access cellular networks is general Rate.
Jiamo Jiang et al. (Jiamo Jiang, Mugen Peng, Wenbo Wang, Kecheng Zhang, " Energy efficiency optimization based on interference alignment for device-to device MIMO downlink underlaying cellular network”,IEEE Globecom 2013Workshop-International Workshop on Device-to-Device(D2D)Commnication With And Without Infrastructure, PP.585-590,2013.) with interference alignment algorithm elimination cellular network downlink Link interference, method are as follows：It first uses coding techniques and eliminates the interference that D2D-P addition cellular networks are brought.Then using dry It disturbs alignment algorithm and the interference between phone user is snapped into specific signal dimension, ensure interference-free between phone user； Finally, optimization postposition coding and linear predictive coding, maximize the energy efficiency of D2D-P.It considers D2D-P and cellular network is added Interference between caused interference and phone user, but D2D-P singal reporting codes such as handling capacity, the performance indicators such as bit error rate do not have There is consideration.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of low, D2D-P of interference The D2D-P of the raising availability of frequency spectrum high with rate is multiplexed cellular network communication method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of D2D-P multiplexing cellular network communication methods improving the availability of frequency spectrum, which is characterized in that including following step Suddenly：
S1, establishes cellular network, and the cellular network includes cellular base station, K phone user CUkAnd M is to equipment User is to D2D-Pm, k=1,2 ..., K, m=1,2 ..., M, the D2D-PmIncluding transmitter and receiver, the honeycomb User, transmitter and receiver are respectively equipped with N number of transmitting antenna number and N number of reception antenna number, and transmitter is sent to receiver Signal vector ZmFor d rows, 1 row, D2D-PmTo CUkChannel matrix Hk,mIt is arranged for N rows, N；
S2, according to Hk,m, using interference alignment method, acquire each D2D-PmN rows, d row pre-coding matrixes FmDisaggregation；
S3 calculates each D2D-PmTo CUkInterference matrix Hk,mFm, design and be orthogonal to Hk,mFmN rows, d row phone user Postposition encoder matrix Wk, k=1,2 ..., K；
S4 is aligned method using based on the interference for minimizing mean square error, acquires all D2D-PmTransmitter precoding square Battle array FmWith receiver postposition encoder matrix Gm, and cellular network communication is carried out, to obtain each phone user CUkSignal to Interference plus Noise Ratio (SINR)；
D2D-P is arranged in S5mSINR threshold values ωthIf D2D-PmSINR be less than ωth, then by the D2D-PmAccess honeycomb Simultaneously β is arranged in networkmValue is 1, and β is otherwise arrangedmValue is 0；
S6, according to transmitter pre-coding matrix FmAnd βm, using improved water injection power distribution method to all D2D-PmDistribution Transmission power Pm；
S7 carries out cellular network communication according to the matrix calculation result and power distribution result of step S2~S6.
The step S2 is specially：By all D2D-PmTo CUkInterference matrix Hk,mFmSnap to the CUkReceiving terminal Same signal subspace on, formula specific as follows：
span(Hk,1F1)=...=span (Hk,mFm)=...=span (Hk,MFM)
Wherein, the subspace that k=1,2 ..., K, span (A) representing matrix A column vectors are turned into.
The step S4 specifically includes following steps：
S41 calculates the emitted machine pre-coding matrix F that receiver receivesmThe signal level S of processingmAnd SmThrough connecing Receipts machine postposition encoder matrix GmThe signal level obtained after processing
S42 defines all D2D-PmSignal level mean square error and εMSEIt is as follows：
Optimization problem as follows is solved using lagrange's method of multipliers：
Wherein, E { } indicates mathematic expectaion, | | X | |2The norm squared of representing matrix X,The F models of representing matrix X Number, PmFor D2D-PmTransmission power,P is all total transmission powers of D2D-P.
In the step S41, emitted machine pre-coding matrix FmProcessed signal level SmIt is specific to calculate such as following formula：
Wherein, PmIt is D2D-PmThe transmission power of transmitter, Hm,mFor D2D-PmN rows, the N row channels of transmitted from transmitter to receiver Matrix, Hm,jFor D2D-PjTransmitter is to D2D-PmN rows, the N row channel matrixes of receiver, nmFor D2D-PmWhat receiver received Ambient noise.
The step S42 specifically includes following steps：
S420 introduces lagrangian multiplierm, obtain Lagrangian：
Wherein, εMSESee the definition of S42.
S421, respectively to G in Lagrangianm、FmPartial derivative is sought, and it is zero to enable partial derivative, obtains equation (1) (2)：
Wherein, m=1,2 ..., M, σ2For ambient noise nmVariance, and E { nmnm H}=σ2I, I are N rank unit matrixs；
S422, initialization pre-coding matrix FmFor random matrix, the random matrix of N rows, d row is obtained；
Postposition encoder matrix G is calculated by formula (2) in S423m；
Formula (1) is substituted into power limitation condition by S424Acquire λm(λm>=0), λmSubstitution formula (1), more New Fm；
S425 calculates mean square error and εMSE；
S426 repeats step S423~S425, until εMSEConvergence, obtains GmAnd Fm。
In the S5, D2D-PmCommunicate SINR threshold values ωthFor：The phone user for participating in communication measures local reception signal Signal to Interference plus Noise Ratio SINR, and cellular base station is issued by feedback channel, wherein minimum SINR is set as D2D-P by cellular base station Communicate SINR threshold values ωth.Local reception signal includes interference of all D2D-P to phone user, and also base station is sent to institute There is the signal of phone user；Some phone user will receive the signal that base station is sent to all phone users, wherein comprising it is expected Signal and unwanted signal, unwanted signal are considered as interference.
In the S6, the improved water injection power distribution method solves D2D-PmTransmission power PmComputational methods be：
Pm=βm(μ/γm-1)+
Wherein, μ is the level of water filling, is metγmFor D2D-PmChannel gain, P is all total transmission powers of D2D-P, function (x)+=max (x, 0) indicates to take the higher value in real number x and 0.
Compared with prior art, the present invention has the following advantages：
(1) D2D-P snaps at phone user the interference of phone user, D2D-P is eliminated using postposition coding techniques Interference to phone user ensure that the communication priority of phone user.
(2) using based on mean square error interference alignment techniques are minimized, the interference between D2D-P is handled, minimum is calculated The encoder matrix for changing D2D-P mean square errors controls interfering with each other between D2D-P.
(3) judge whether D2D-P accesses cellular network by hard decision function, using improved water injection power distribution method, To the D2D-P of network is addedmDistribute transmission power Pm, improve D2D-P and rate.
Description of the drawings
Fig. 1 is phone user and equipment user's mutual interference schematic diagram under cellular network of the present invention；
Fig. 2 is overall flow figure of the present invention；
Fig. 3 is the method for the present invention detail flowchart.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to Following embodiments.
Embodiment
Fig. 1 is the schematic diagram that equipment user couple and phone user coexists in equipment in cellular network, which includes one Cellular base station, base station are the evolved of LTE-A (Long Term Evolution-Advanced, long-term evolution upgrading version) standard Base station (evolved NodeBs), and phone user and equipment are covered comprehensively to equipment user couple.In its coverage area, at random K phone user and M are dispersed with to D2D-P, wherein D2D-P points are transmitter and receiver.Set phone user, D2D-P hairs Penetrate antenna number, reception antenna number is 2, have 2 phone users and 2 couples of D2D-P, D2D-P and bee in cellular base station coverage area Nest user can obtain complete channel state information.
Fig. 2 is a kind of D2D-P multiplexing cellular network communication method flow diagrams improving the availability of frequency spectrum, including following step Suddenly：
S1, establishes cellular network, and the cellular network includes cellular base station, K phone user CUkAnd M is to equipment User is to D2D-Pm, k=1,2 ..., K, m=1,2 ..., M, the D2D-PmIncluding transmitter and receiver, phone user, It is N, the signal vector that transmitter is sent to receiver that the transmitting antenna number of transmitter and receiver, which is N, reception antenna number, For d rows, the Z of 1 rowm, D2D-PmTo CUkChannel matrix be N rows, N arrange Hk,m；
S2, according to Hk,m, using interference alignment method, acquire each D2D-PmN rows, d row pre-coding matrixes FmDisaggregation；
S3 calculates D2D-PmTo CUkInterference matrix Hk,mFm, design and be orthogonal to Hk,mFmN rows, d row phone user after Set encoder matrix Wk；
S4 is aligned method using based on the interference for minimizing mean square error, acquires all D2D-PmTransmitter precoding square Battle array FmWith receiver postposition encoder matrix Gm, start cellular network and communicated；
D2D-P is arranged in S5mSINR threshold values ωthIf D2D-PmSINR be less than ωth, then by the D2D-PmAccess honeycomb Network；β is setmIndicate D2D-PmCellular network whether is accessed, then β is accessedmValue is 1, otherwise βmValue is 0；
S6, according to transmitter pre-coding matrix FmAnd βm, using improved water injection power distribution method to all D2D-PmDistribution Transmission power Pm；
S7 carries out cellular network communication according to the matrix calculation result and power distribution result of step S2~S6.
The step S2 is specially：By all D2D-PmTo CUkInterference matrix Hk,mFmSnap to the CUkReceiving terminal Same signal subspace on, formula specific as follows：
span(Hk,1F1)=...=span (Hk,mFm)=...=span (Hk,MFM)
Wherein, the subspace that k=1,2 ..., K, span (A) representing matrix A column vectors are turned into.
The step S4 specifically includes following steps：
S41 calculates the emitted machine pre-coding matrix F that receiver receivesmThe signal level S of processingmAnd received machine Postposition encoder matrix GmThe signal level of processing
S42 defines all D2D-PmSignal level mean square error and εMSEIt is as follows：
Optimization problem as follows is solved using lagrange's method of multipliers：
Wherein, E indicates it is expected,The F norms of representing matrix X, PmFor D2D-PmTransmission power,P is The total transmission powers of all D2D-P.
In the step S41, emitted machine pre-coding matrix FmProcessed signal level SmIt is specific to calculate such as following formula：
Wherein, PmIt is D2D-PmThe transmission power of transmitter, Hm,mFor D2D-PmN rows, the N row channels of transmitted from transmitter to receiver Matrix, Hm,jFor D2D-PjTransmitter is to D2D-PmN rows, the N row channel matrixes of receiver, nmFor D2D-PmWhat receiver received Ambient noise.
The step S42 specifically includes following steps：
S420 introduces lagrangian multiplierm, obtain Lagrangian：
Wherein, εMSESee the definition of S42.
S421, respectively to G in Lagrangianm、FmPartial derivative is sought, and it is zero to enable partial derivative, obtains equation (1) (2)：
Wherein, m=1,2 ..., M, σ2For ambient noise nmVariance, and E { nmnm H}=σ2I, I are N rank unit matrixs；
S422, initialization pre-coding matrix FmFor random matrix, the random matrix of N rows, d row is obtained；
Postposition encoder matrix G is calculated by formula (2) in S423m；
Formula (1) is substituted into power limitation condition by S424Acquire λm, λm>=0, λmSubstitution formula (1), update Fm；
S425 calculates mean square error and εMSE；
S426 repeats step S423~S425, until εMSEConvergence, obtains GmAnd Fm。
In the S5, D2D-PmCommunicate SINR threshold values ωthFor：The phone user for participating in communication measures local reception signal Signal to Interference plus Noise Ratio SINR, and cellular base station is issued by feedback channel, wherein minimum SINR is set as D2D-P by cellular base station Communication threshold ωth, local reception signal includes interference of all D2D-P to phone user, and also base station is sent to all bees The signal of nest user；Some phone user will receive the signal that base station is sent to all phone users, wherein including desired signal And unwanted signal, unwanted signal are considered as interference.
In the S6, PmCalculating formula is：
Pm=βm(μ/γm-1)+
Wherein, μ is the level of water filling, is metγmFor D2D-PmChannel gain, P is all total transmission powers of D2D-P, function (x)+=max (x, 0) indicates to take the higher value in real number x and 0.
The communication means is applied to cellular network shown in FIG. 1, steps are as follows：
(1) cellular base station (BS there are one setting in communication scenes0), 2 phone user (CU1、CU2) and 2 couples of D2D-P；
Phone user, D2D-P are all made of multiple antennas, and phone user, the transmitting of D2D-P, reception antenna number are set as 2；
D2D-PmThe signal vector that middle transmitter is sent to receiver is the matrix Z of 2 rows, 1 rowm, m=1 or 2；
(2) remember D2D-PmTo CUkThe channel matrix of (k=1 or 2) is the H of 2 rows, 2 rowk,m, D2D-PmOn pre-coding matrix For 2 rows, the F of 2 rowm.By D2D-Pm(m=1,2) to CUkInterference Hk,mFmSnap to CUkThe same signal subspace of receiving terminal On, as follows：
span(H1,1F1)=span (H1,2F2)
span(H2,1F1)=span (H2,2F2)
Wherein, the subspace that span (A) representing matrix A column vectors expand；It can be acquired by two above-mentioned constraintss FmDisaggregation；
(3) remember CUkThe postposition encoder matrix that (k=1 or 2) receives signal is the W of 2 rows, 2 rowk.Design postposition encoder matrix WkIt is orthogonal to D2D-PmTo CUkInterference channel matrix Hk,mFm(m=1 or 2), as follows：
Wk=Null (Hk,mFm), m=1,2
Wherein, B=Null (A), representing matrix B are orthogonal to matrix A；
(4) remember D2D-PmThe postposition encoder matrix of receiving terminal is the G of 2 rows, 2 rowm.Using dry based on mean square error is minimized Alignment algorithm is disturbed, obtains minimizing D2D-PmThe postposition encoder matrix G of (m=1 or 2) mean square error1, G2With pre-coding matrix F1, F2, it is shown that steps are as follows：
A, respectively to G in Lagrangianm、Fm(m=1 or 2) seeks partial derivative, and it is zero to enable their partial derivative, is obtained Equation (1) (2)：
Wherein, m=1 or 2, σ2For ambient noise nmVariance；
B, initialization pre-coding matrix FmFor 2 rows, the random matrix of 2 row；
C, postposition encoder matrix G is calculated by formula (2)m；
D, (1) formula is substituted into power limitation conditionAcquire λm(λm>=0), λmSubstitute into formula (1), update Fm；
E, mean square error ε is calculatedMSE；
F, step c, d, e are repeated, until εMSEConvergence, obtains Gm, FmAs solved；
(5) according to pre-coding matrix Fm(m=1 or 2) calculates the channel gain γ of D2D-P mm, as follows：
(6) phone user for participating in communication measures the Signal to Interference plus Noise Ratio (SINR) of local reception signal, and passes through feedback channel Issue BS0, by BS0Wherein minimum SINR is set as D2D-P communication thresholds ωth.Then D2D-P is judged using hard decisionmWhether Cellular network is accessed, symbol beta is usedmIt indicates, as follows：
Wherein, SINRD2DmIndicate D2D-PmSINR value；βmValue is set to 0, and indicates D2D-PmCellular network cannot be accessed；βmValue 1 is set, indicates D2D-PmCellular network can be accessed；
(7) according to γmAnd βm, D2D-P is distributed according to improved water injection power allocation algorithmmTransmission power Pm, following institute Show：
Pm=βm(μ/γm-1)+, m=1,2
Wherein, μ is the level of water filling, is metFunction (x)+=max (x, 0) expressions take real number x and 0 Maximum operation.

Claims (4)

1. a kind of D2D-P improving the availability of frequency spectrum is multiplexed cellular network communication method, which is characterized in that include the following steps：
S1, establishes cellular network, and the cellular network includes cellular base station, K phone user CUkAnd M to equipment to equipment User is to D2D-Pm, k=1,2 ..., K, m=1,2 ..., M, the D2D-PmIncluding transmitter and receiver, the honeycomb User, transmitter and receiver are respectively equipped with N number of transmitting antenna number and N number of reception antenna number, and transmitter is sent to receiver Signal vector ZmFor d rows, 1 row, D2D-PmTo CUkChannel matrix Hk,mIt is arranged for N rows, N；
S2, according to Hk,m, using interference alignment method, acquire each D2D-PmN rows, d row pre-coding matrixes FmDisaggregation, specially： By all D2D-PmTo CUkInterference matrix Hk,mFmSnap to the CUkIt is specific as follows on the same signal subspace of receiving terminal Formula：
span(Hk,1F1)=...=span (Hk,mFm)=...=span (Hk,MFM)
Wherein, the subspace that k=1,2 ..., K, span (A) representing matrix A column vectors are turned into；
S3 calculates each D2D-PmTo each CUkInterference matrix Hk,mFm, design and be orthogonal to Hk,mFmN rows, d row each phone user Postposition encoder matrix Wk；
S4 is aligned method using based on the interference for minimizing mean square error, acquires all D2D-PmTransmitter pre-coding matrix Fm With receiver postposition encoder matrix Gm, and cellular network communication is carried out, to obtain each phone user CUkSignal to Interference plus Noise Ratio SINR, tool Body includes the following steps：
S41 calculates the emitted machine pre-coding matrix F that receiver receivesmThe signal level S of processingmAnd SmReceived machine Postposition encoder matrix GmThe signal level obtained after processing
S42 defines all D2D-PmSignal level mean square error and εMSEIt is as follows：
Optimization problem as follows is solved using lagrange's method of multipliers：
Wherein, E { } indicates mathematic expectaion, | | X | |2The norm squared of representing matrix X,The F norms of representing matrix X are flat Side, PmFor D2D-PmTransmission power, and meetP is all total transmission powers of D2D-P；
D2D-P is arranged in S5mSINR threshold values ωthIf D2D-PmSINR be less than ωth, then by the D2D-PmCellular network is accessed, And β is setmValue is 1, and β is otherwise arrangedmValue is 0；
S6, according to transmitter pre-coding matrix FmAnd βmValue, using improved water injection power distribution method to all D2D-PmDistribution hair Send power Pm, transmission power PmComputational methods be：
Pm=βm(μ/γm-1)+
Wherein, μ is the level of water filling, is metγmFor D2D-PmChannel gain,P is all total transmission powers of D2D-P, function (x)+=max (x, 0) expressions take in real number x and 0 Higher value；
S7 carries out cellular network communication according to the matrix calculation result and power distribution result of step S2~S6.
2. a kind of D2D-P improving the availability of frequency spectrum according to claim 1 is multiplexed cellular network communication method, feature It is, in the step S41, emitted machine pre-coding matrix FmProcessed signal level SmIt is specific to calculate such as following formula：
Wherein, PmIt is D2D-PmThe transmission power of transmitter, Hm,mFor D2D-PmN rows, the N row channel squares of transmitted from transmitter to receiver Battle array, Hm,jFor D2D-PjTransmitter is to D2D-PmN rows, the N row channel matrixes of receiver, nmFor D2D-PmThe ring that receiver receives Border noise.
3. a kind of D2D-P improving the availability of frequency spectrum according to claim 1 is multiplexed cellular network communication method, feature It is, the step S42 specifically includes following steps：
S420 introduces lagrangian multiplierm, obtain Lagrangian：
Wherein, εMSEFor signal level mean square error and；
S421, respectively to G in Lagrangianm、FmPartial derivative is sought, and it is zero to enable partial derivative, obtains equation (1), (2)：
Wherein, m=1,2 ..., M, σ2For ambient noise nmVariance, and E { nmnm H}=σ2I, I are N rank unit matrixs；
S422, initialization pre-coding matrix FmFor random matrix；
Postposition encoder matrix G is calculated by formula (2) in S423m；
Formula (1) is substituted into power limitation condition by S424Acquire λm, λmSubstitution formula (1) updates Fm；
S425 calculates all D2D-PmSignal level mean square error and εMSE；
S426 repeats step S423~S425, until εMSEConvergence, obtains GmAnd Fm。
4. a kind of D2D-P improving the availability of frequency spectrum according to claim 1 is multiplexed cellular network communication method, feature It is, in the S5, D2D-PmCommunicate SINR threshold values ωthFor：The phone user for participating in communication measures local reception signal Signal to Interference plus Noise Ratio SINR, and cellular base station is issued by feedback channel, wherein minimum SINR, which is set as D2D-P, by cellular base station leads to Believe threshold value ωth。
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