CN109219026B - D2D transmission method based on energy capture and interference cancellation in uplink relay network - Google Patents
D2D transmission method based on energy capture and interference cancellation in uplink relay network Download PDFInfo
- Publication number
- CN109219026B CN109219026B CN201811345984.1A CN201811345984A CN109219026B CN 109219026 B CN109219026 B CN 109219026B CN 201811345984 A CN201811345984 A CN 201811345984A CN 109219026 B CN109219026 B CN 109219026B
- Authority
- CN
- China
- Prior art keywords
- energy
- relay
- signal
- receiving end
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001413 cellular effect Effects 0.000 claims abstract description 93
- 230000008030 elimination Effects 0.000 claims abstract description 10
- 238000003379 elimination reaction Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000005562 fading Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000009365 direct transmission Effects 0.000 claims 2
- 238000005457 optimization Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012887 quadratic function Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a D2D transmission method based on energy capture and interference elimination in an uplink relay network, which comprises two stages: in the first stage, both the relay and the D2D receiver receive signals from the cellular user and the D2D transmitter, and perform energy capture from the received signals; in the second stage, the relay node forwards the received signal to the base station and the receiving end of D2D by using an amplify-and-forward protocol. The base station directly decodes the signal to obtain the signal sent by the cellular user, and the D2D receiving end firstly eliminates the interference of the cellular user by using the relayed signal, and then performs signal decoding to obtain the D2D signal. After the cellular network interference cancellation for D2D transmission is achieved, constraints and optimization problems are formulated in order to maximize the transmission benefits of both the cellular network and the D2D device. Through the solution of the optimization problem, the invention realizes the energy-efficient D2D transmission based on energy capture and interference elimination in the uplink relay network.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a D2D transmission method based on energy capture and interference elimination in an uplink relay network, which removes the interference of a cellular network on D2D equipment, and improves the frequency spectrum utilization rate of the network and the energy utilization rate of D2D equipment.
Background
The improvement of the spectrum utilization rate is one of the problems facing the development of the wireless communication technology. Now, the importance of the problem is more prominent at the time when the internet of things and 5G technology are about to be commercialized. There are a large number of D2D devices in a 5G network, which would slow down the efficiency of the overall system deployment and would also cause a waste of spectrum if unauthorized spectrum were allocated to these devices. Therefore, the D2D user accessing the spectrum of the cellular system to transmit his own signal becomes one of the solutions to the above-mentioned problems. In addition, the D2D device cannot guarantee a continuous supply of energy due to his mobility. Energy capture technology, as a promising technology, can solve this problem.
The ability of the D2D sender to access the spectrum of the cellular network and capture energy from the network for its own transmissions may improve the outage performance of D2D communications. In order to maximize the transmission rate of the D2D device based on energy capture, the resource and energy allocation can be considered jointly, and a corresponding optimization problem can be formulated, so as to solve the problem. In addition, such a cooperative transmission manner also causes interference to the cellular network. In order to ensure the service quality of the cellular network, the optimization problem meeting the service quality requirement of the cellular network can be formulated by jointly considering the aspects of spectrum resources, transmission time slots, energy allocation and the like. And reasonable resource allocation is carried out by solving the optimization problem, so that the problem is solved.
Cooperative communication of D2D devices with a cellular network effectively improves spectrum utilization efficiency. When the transmission energy of the D2D device is not guaranteed due to consumption, the quality of service (QoS) of the D2D communication is greatly compromised. Meanwhile, the cellular network may cause interference to the D2D device, which greatly reduces the decoding capability of the D2D receiving end. Therefore, a solution that can eliminate interference and continuously supply power is needed to ensure the reliability of efficient D2D transmission.
Disclosure of Invention
Aiming at the problem that the cellular network interferes with D2D transmission when D2D equipment is transmitted in the cellular network, the invention provides a D2D transmission method based on energy capture and interference elimination in an uplink relay network. The method makes full use of the signals forwarded by the relay nodes in the cellular network, and eliminates the interference signals of the cellular network. Meanwhile, the quality of D2D transmission is greatly improved by reasonably designing the relay and the energy splitting ratio of the D2D receiving end.
The invention is realized by adopting the following technical scheme:
the D2D transmission method based on energy capture and interference cancellation in the uplink relay network, the D2D and the uplink relay network comprise a pair of D2D users, a cellular user, a relay node and a base station S, wherein the D2D user comprises a transmitting end and a receiving end;
the transmission method is divided into two stages:
in the first stage, a cellular user and a D2D sending terminal respectively send signals to a relay node and a D2D receiving terminal, and simultaneously, the relay node and the D2D receiving terminal both receive the interference of the D2D sending terminal and the cellular user, and then the relay node and the D2D receiving terminal respectively capture energy from the received signals by using an energy splitting protocol; wherein, the relay relays the remaining captured signal with the captured energy, and the receiving end of D2D charges its battery with the captured energy for subsequent transmission;
in the second stage, the relay forwards signals, and both the base station and the D2D receiving end receive the signals from the relay; the base station directly decodes the signal to obtain the signal required by the base station; at a receiving end of the D2D, because the signals received in the two stages both include the signal of the cellular network, the interference signal of the cellular network can be eliminated by using the interference elimination technology, and then the D2D signal is obtained by performing signal decoding; assuming that there is no direct link between the cellular user and the base station due to fading and obstacles, the D2D sender is located on the same side as the cellular user and there is no direct link with the base station.
The invention is further improved in that the transmission method is implemented as follows:
step 1: cellular subscriber to relay signal xCMeanwhile, the D2D sender accesses the frequency spectrum of the cellular network to transmit own signal xA；
Step 2: the relay and the D2D receiving ends respectively receive the signals transmitted by the corresponding transmitting ends and simultaneously receive the interference signals of other transmitting ends, and the received signals are respectively expressed as yRAnd yB1；
Step 3: relay and D2D receiver using energy splittingThe protocol captures energy from the received signal, the captured energy being denoted PRAnd EB；
Step 4: the relay uses the captured energy to amplify and forward the remaining signal, denoted xR；
Step 5: the base station receives the signal from the relay and decodes it to obtain the signal sent by the cellular user, the received signal and the decoded signal-to-noise ratio being respectively denoted ySAnd ρS；
Step 6: the receiving end of D2D receives the signal transmitted by the relay, and the received signal is represented as yB2；
Step 7; the signals received by the D2D receiving end in two stages comprise interference x of the cellular networkCTherefore, the D2D receiving end can cancel the interference x of the cellular network by using the interference cancellation techniqueCAfter the interference is eliminated, decoding is carried out to obtain a signal sent by a D2D sending end, the signal with the good interference elimination and the decoding signal-to-noise ratio are expressed as yBAnd ρB。
A further improvement of the invention is that the signals at the relay and D2D receivers in Step 2 are denoted as respectively
The energy of the Step 3 relay and the energy capture of the D2D receiving end are respectively expressed as
PR＝ηγ1(PC|h1|2+PA|h4|2)
The signal transmitted by the relay node in Step 4 is represented as
The received signal and the decoding signal-to-noise ratio of the base station in Step 5 are respectively expressed as
The signal received by the receiving end of D2D in Step 6 is represented as
In Step 7, the signal after the interference is eliminated at the D2D receiving end and the decoding signal-to-noise ratio are respectively expressed as
Wherein, PCAnd PARespectively representing a cellular user and a D2D sender for transmitting signal xCAnd xAThe energy of (a); gamma is not less than 01Gamma is not less than 1 and not more than 02The energy splitting ratios of the relay and the D2D receiving end are respectively represented by less than or equal to 1;
a signal amplification factor representing a relay node; 0 < eta < 1 represents energy conversion efficiency; h is1，h2，h3，h4，h5And h6Respectively, cellular users and relays, cellular users and D2D receivers, and D2DChannel coefficients among devices, between a D2D sending end and a relay middle, between a relay and a D2D receiving end and between the relay and a base station respectively obey Rayleigh fading with probability density functions of independent and same distribution being CN (0, 1); n is1，n2，n3，n4，n5And n6The probability density functions of the white Gaussian noises respectively representing the white Gaussian noises generated by the relay, the D2D receiving end, the signal from the broadband to the baseband, the D2D receiving end, the signal from the broadband to the baseband and the base station are CN (0, sigma)0 2)。
The invention further improves that in Step 7, in order to meet the energy-efficient requirement of D2D communication, the D2D energy-efficient transmission constraint C1 is set as follows:
wherein,
is the energy efficiency of the D2D device,
is the transmission rate, η, of the D2D communication0Is the lowest energy efficiency of the D2D device.
A further improvement of the present invention is that, in Step 5, the qos requirement C2 of the cellular network is set as follows:
wherein,
is the transmission rate, T, of the cellular networkSIs the target transmission rate of the cellular network.
A further improvement of the present invention is that in Step 3, the energy capture constraint C3 of the D2D plant is set as follows:
wherein e isBIs the minimum captured energy at the receiving end of D2D.
The invention is further improved in that in Step 4, according to the set constraint condition, the optimal energy splitting ratio is allocated to maximize the D2D transmission rate, and the optimal energy splitting ratio satisfies the requirement of meeting the requirement of the transmission rate
Wherein,
and
respectively represent gamma1And gamma2The optimum value of (d);
the invention is further improved in that in Step 5, the energy splitting ratio gamma is respectively distributed to the relay and the receiving end of D2D1 optimalAnd gamma2 optimalUltimately, energy efficient D2D transmission is achieved.
The invention has the following beneficial technical effects:
aiming at the problem that the cellular network causes interference to the D2D transmission when the D2D accesses the spectrum transmission information of the cellular network, the invention comprehensively utilizes the technical advantages of cooperative relaying and the architecture of the D2D receiving end, completely eliminates the interference caused by the cellular network to the D2D user through the relayed and forwarded signals, and greatly reduces the interference of the D2D communication. In a network without relay nodes, the D2D receives cellular signals with larger energy. Therefore, compared with a network without a relay node, the D2D transmission scheme provided by the invention greatly improves the purity of D2D communication, and only noise generated by antenna and signal processing is generated during decoding, so that a D2D user can complete efficient information transmission with minimum power consumption.
Further, the present invention allows the relay node and the D2D receiving end to capture energy from the received signal, in view of the problems of network energy consumption and D2D communication persistence. The relay node continues to relay signals by using the captured energy, and the D2D receiving end charges the D2D device by using the captured energy for subsequent information transmission. According to the invention, the energy required by the relay node for forwarding information is reduced through an energy capture technology, and meanwhile, the battery at the receiving end of the D2D can be charged by utilizing the captured energy, so that the service life of the battery is greatly prolonged, and the continuity of the D2D communication is improved.
Further, aiming at the efficient transmission problem of D2D communication, the invention solves the optimal energy distribution factor by establishing an optimization problem. In order to guarantee the service quality requirement of a cellular network and the efficient, rapid and continuous completion of information transmission of D2D equipment, the invention sets a D2D transmission rate maximization problem and corresponding constraint conditions, and realizes efficient D2D transmission by obtaining an optimal energy splitting ratio between a relay node and a D2D receiving end through the solution of the problem. As can be seen from the simulation results, the present invention slightly increases the outage probability of the cellular network compared to the cellular network without relay nodes, but to a very small extent. In addition, the optimized energy splitting ratio maximizes the energy efficiency and transmission rate of D2D meeting the constraint condition compared with other energy splitting ratios.
Drawings
Fig. 1 is a diagram of the proposed system framework.
Fig. 2 and 3 are structural diagrams of a relay and a receiving end of D2D, respectively.
Fig. 4 is a graph of energy efficiency versus transmit-side signal-to-noise ratio for a D2D transmission.
Fig. 5 and 6 are transmission rate diagrams for a D2D device and a cellular network, respectively.
Fig. 7 is a graph of outage probability versus transmit-side signal-to-noise ratio for a cellular network and D2D transmission.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 presents a system framework diagram considering a pair of cellular D2D users transmitting in an upstream relay network. This network consists of cellular user, relay node, base station and D2D pairs. All nodes have one antenna and work in half-duplex mode simultaneously. The relay node and the receiving end of D2D capture energy from the received signal by using an energy splitting protocol, and the relay node relays the signal by using an amplifying and forwarding protocol. The relay node uses the captured energy to forward the remaining signals, and the D2D receiver stores the captured energy in a battery for subsequent use.
Fig. 2 and 3 show the structure of the relay and the receiving end of D2D. The relay is composed of an energy splitter, an energy receiver, an information receiver and a transmitter. The work flow of the relay is as follows: firstly, based on the energy splitting method [8], the relay node R divides the received signal into two parts for processing, one part is used for energy capture and the other part is used for information forwarding. The transmitter will then forward the signal received by the decoding receiver to the destination using the intercepted energy. The D2D receiving end is composed of an energy splitter, an energy receiver, an information receiver, a battery and a decoding receiver. The work flow of the D2D receiving end is as follows: first, in the first stage, the energy splitting based method [8], D2D receiver divides the received signal into two parts for processing, one part for energy capture and the other part for information processing. In the second stage, the D2D decodes the signal from the relay at the receiver, and simultaneously performs noise elimination processing with the signal remaining from the energy capture in the first stage, and finally decodes the signal transmitted by the transmitting end of the D2D.
Based on the models of fig. 1, fig. 2 and fig. 3, the novel cooperative transmission of D2D and the uplink relay network proposed by the present invention is divided into two stages: in the first stage, the cellular user and the D2D transmitter respectively transmit signals to the relay node and the D2D receiver, and both the relay node and the D2D receiver receive the interference from the D2D transmitter and the cellular user. Then, the relay node and the receiving end of D2D capture energy from the received signal respectively by using an energy splitting protocol. The relay relays the remaining captured signal with the captured energy, and the receiver D2D charges its battery with the captured energy for subsequent transmission. In the second stage, the relay performs signal forwarding, and both the base station and the receiving end of D2D will receive the signal from the relay. The base station directly decodes the signal to obtain the signal required by the base station. At the receiving end of D2D, since the signals received in the two stages both include the signal of the cellular network, the interference signal of the cellular network can be eliminated by using the interference cancellation technique, and then the D2D signal can be obtained by performing signal decoding. It is assumed that there is no direct link between the cellular user and the base station due to fading, obstructions, etc. The D2D sender is located on the same side as the cellular user and has no direct link with the base station. The concrete implementation is as follows:
step 1: cellular subscriber to relay signal xCMeanwhile, the D2D sender accesses the frequency spectrum of the cellular network to transmit own signal xA；
Step 2: the relay and the D2D receiving ends respectively receive the signals transmitted by the corresponding transmitting ends and also receive the interference signals of other transmitting ends, and the received signals are respectively expressed as yRAnd yB1；
Step 3: the relay and the receiving end of D2D capture energy from the received signal by using an energy splitting protocol, and the captured energy is respectively represented as PRAnd EB；
Step 4: the relay uses the captured energy to amplify and forward the remaining signal, denoted xR；
Step 5: the base station receives the signal from the relay and decodes it to obtain the signal sent by the cellular user, the received signal and the decoded signal-to-noise ratio being respectively denoted ySAnd ρS；
Step 6: the receiving end of D2D receives the signal transmitted by the relay, and the received signal is represented as yB2；
Step 7: the signals received by the D2D receiving end in two stages comprise interference x of the cellular networkCTherefore, the D2D receiving end can utilize the trunkInterference cancellation technique for cancelling interference x of cellular networkCAfter the interference is eliminated, decoding is carried out to obtain a signal sent by a D2D sending end, the signal with the good interference elimination and the decoding signal-to-noise ratio are expressed as yBAnd ρB。
The specific expression of each stage signal is as follows:
the signals at the relay and the receiving end of D2D in Step 2 are respectively shown as
The energy of the Step 3 relay and the energy capture of the D2D receiving end are respectively expressed as
PR＝ηγ1(PC|h1|2+PA|h4|2)
The signal transmitted by the relay node in Step 4 is represented as
The received signal and the decoding signal-to-noise ratio of the base station in Step 5 are respectively expressed as
The signal received by the receiving end of D2D in Step 6 is represented as
In Step 7, the signal after the interference is eliminated at the D2D receiving end and the decoding signal-to-noise ratio are respectively expressed as
Wherein, PCAnd PARespectively representing a cellular user and a D2D sender for transmitting signal xCAnd xAThe energy of (a); gamma is not less than 01Gamma is not less than 1 and not more than 02The energy splitting ratios of the relay and the D2D receiving end are respectively represented by less than or equal to 1;
a signal amplification factor representing a relay node; 0 < eta < 1 represents energy conversion efficiency; h is1，h2，h3，h4，h5And h6Respectively representing channel coefficients between a cellular user and a relay, between the cellular user and a D2D receiving terminal, between D2D devices, between a D2D sending terminal and a relay middle, between the relay and a D2D receiving terminal and between the relay and a base station, wherein probability density functions subjected to independent and same distribution are Rayleigh fading of CN (0, 1); n is1，n2，n3，n4，n5And n6The probability density functions of the white Gaussian noises respectively representing the white Gaussian noises generated by the relay, the D2D receiving end, the signal from the broadband to the baseband, the D2D receiving end, the signal from the broadband to the baseband and the base station are CN (0, sigma)0 2)。
Based on the proposed cooperative transmission model of D2D and an uplink relay network, an energy-efficient D2D transmission scheme is proposed, which is characterized in that:
in order to meet the energy efficient requirement of D2D communication, D2D energy efficient transmission constraint meeting the practical situation is set;
setting corresponding transmission rate constraints in order to meet the service quality requirements of the cellular network;
setting corresponding energy capture constraints in order to enable the D2D equipment to be powered continuously;
fourthly, in order to maximize the transmission rate of the D2D, a corresponding D2D transmission rate maximization problem is made according to constraint conditions. Through the solution of the D2D transmission rate maximization problem, energy-efficient D2D transmission is finally achieved.
An energy efficient D2D transmission scheme, embodied as:
step 1: the D2D energy efficient transport constraint C1 was set.
Step 2: the quality of service requirement C2 of the cellular network is set.
Step 3: the energy capture constraint of the D2D device C3 was set.
Step 4: and according to the set constraint conditions, allocating an optimal energy splitting ratio to maximize the D2D transmission rate. Optimum energy split ratio satisfies
Step 5: energy splitting ratio gamma is respectively distributed for the relay and the D2D receiving end1 optimalAnd gamma2 optimalAnd energy-efficient D2D transmission is realized.
Wherein,
is the energy efficiency of the D2D device.
And
the transmission rates of the cellular network and D2D communications, respectively. Eta0Is the lowest energy efficiency of the D2D device. T isSIs the target transmission rate of the cellular network. e.g. of the typeBIs the minimum captured energy at the receiving end of D2D.
The simulation verification of the present invention is shown in fig. 4, fig. 5, fig. 6 and fig. 7, respectively. The cancellation of interference to D2D devices by cellular networks compared to prior solutions has been described in the above section. Next, we verify the improvement of the present invention in system performance using the simulation results. In the simulation, in order to guarantee the service quality of the cellular network, the invention sets the transmission energy at the sending end of the D2D as 1/3 of the cellular user sending energy.
Fig. 4 shows the energy efficiency of D2D versus different energy splitting ratios for varying transmit signal-to-noise ratios. The graph shows that under the condition that the signal-to-noise ratio of the transmitting end is the same, the energy efficiency of D2D corresponding to the optimal energy efficient scheme is always higher than that of D2D corresponding to other energy splitting ratios, which shows that the energy efficiency of D2D is maximized by the energy efficient D2D transmission scheme provided by the invention. Meanwhile, it can be found from the figure that as the signal-to-noise ratio of the transmitting end increases, the energy efficiency of D2D shows a trend of increasing first and then decreasing, which indicates that the larger the energy of the transmitting end is, the better the energy of the transmitting end is, but there is a transmitting end energy that is in accordance with the optimal energy efficiency.
Fig. 5 and 6 show the relation between the transmission rate of the D2D device and the cellular network and the energy splitting ratio of the relay node and the receiving end of the D2D, respectively. As can be seen from fig. 5, the transmission rate of the D2D device is quadratic function with the energy splitting ratio of the relay node, and is decreasing function with the energy splitting ratio of the D2D receiving end. As can be seen from fig. 6, the transmission rate of the cellular network has a quadratic function relationship with the energy splitting ratio of the relay node, and has no relation with the energy splitting ratio of the receiving end of D2D. This shows that it is necessary to optimize the energy split ratio between the relay node and the D2D receiver in order to maximize the transmission benefit of the D2D device and the cellular network.
Fig. 7 shows the outage probability of cellular network and D2D transmission versus the transmit-side signal-to-noise ratio. The graph shows that the outage probability for the cellular network and D2D transmissions for the proposed optimal energy efficient scheme is always lower than the outage probability for the other energy splitting ratios, which demonstrates the effectiveness of the proposed energy efficient D2D transmission scheme of the present invention. Meanwhile, it can be found from the figure that, as the signal-to-noise ratio of the transmitting end increases, the interruption probability of the cellular network corresponding to the optimal energy-efficient scheme is slightly higher than that of the cellular network without the relay node, which shows that the service quality of the cellular network is hardly reduced by the present invention.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. The D2D transmission method based on energy capture and interference cancellation in the uplink relay network is characterized in that the D2D and the uplink relay network comprise a pair of D2D users, a cellular user, a relay node and a base station S, wherein the D2D user comprises a transmitting end and a receiving end;
the transmission method is divided into two stages:
in the first stage, a cellular user and a D2D sending terminal respectively send signals to a relay node and a D2D receiving terminal, and simultaneously, the relay node and the D2D receiving terminal both receive the interference of the D2D sending terminal and the cellular user, and then the relay node and the D2D receiving terminal respectively capture energy from the received signals by using an energy splitting protocol; wherein, the relay relays the remaining captured signal with the captured energy, and the receiving end of D2D charges its battery with the captured energy for subsequent transmission;
in the second stage, the relay forwards signals, and both the base station and the D2D receiving end receive the signals from the relay; the base station directly decodes the signal to obtain the signal required by the base station; at a receiving end of D2D, because signals received in the two stages both contain signals of a cellular network, interference signals of the cellular network are eliminated by using an interference elimination technology, and then the signals are decoded to obtain D2D signals; assuming that there is no direct transmission link between the cellular user and the base station due to fading and obstacles, the D2D sender is located on the same side as the cellular user and has no direct transmission link with the base station;
the transmission method is specifically realized as follows:
step 1: cellular subscriber to relay signal xCMeanwhile, the D2D sender accesses the frequency spectrum of the cellular network to transmit own signal xA；
Step 2: the relay and the D2D receiving end receive the signal transmitted by the corresponding transmitting end and also receive the interference signal of other transmitting ends, where the received signals are respectively denoted as yRAnd yB1Are respectively represented as
Step 3: the relay and the receiving end of D2D capture energy from the received signal by using an energy splitting protocol, and the captured energy is respectively expressed asPRAnd EB(ii) a The energy captured by the relay and the receiving end of D2D are respectively expressed as
PR＝ηγ1(PC|h1|2+PA|h4|2)
The energy capture constraint of the D2D device, C3, was set as follows:
wherein e isBIs the minimum captured energy at the receiving end of D2D;
step 4: the relay uses the captured energy to amplify and forward the remaining signal, denoted xRIs shown as
According to the set constraint conditions, the optimal energy splitting ratio is allocated to maximize the D2D transmission rate, and the optimal energy splitting ratio satisfies the requirement
Wherein,
and
respectively represent gamma1And gamma2The optimum value of (d);
step 5: the base station receives the signal from the relay and decodes it to obtain the signal sent by the cellular user, the received signal and the decoded signal-to-noise ratio being respectively denoted ySAnd ρSThe following are:
setting the quality of service requirement C2 for the cellular network as follows:
wherein,
is the transmission rate, T, of the cellular networkSIs the target transmission rate of the cellular network;
step 6: the receiving end of D2D receives the signal transmitted by the relay, and the received signal is represented as yB2The following are:
step 7: the signals received by the D2D receiving end in two stages comprise interference x of the cellular networkCTherefore, the D2D receiving end eliminates the interference x of the cellular network by using the interference elimination technologyCThe signals are decoded after the interference is eliminated so as to obtain the signals sent by the D2D sending end, and the signals after the interference is eliminatedAnd the decoding signal-to-noise ratio is expressed as yBAnd ρBThe following are:
wherein, PCAnd PARespectively representing a cellular user and a D2D sender for transmitting signal xCAnd xAThe energy of (a); gamma is not less than 01Gamma is not less than 1 and not more than 02The energy splitting ratios of the relay and the D2D receiving end are respectively represented by less than or equal to 1;
a signal amplification factor representing a relay node; 0 < eta < 1 represents energy conversion efficiency; h is1，h2，h3，h4，h5And h6Respectively representing channel coefficients between a cellular user and a relay, between the cellular user and a D2D receiving terminal, between D2D devices, between a D2D sending terminal and the relay, between the relay and a D2D receiving terminal and between the relay and a base station, wherein probability density functions subjected to independent and same distribution are Rayleigh fading of CN (0, 1); n is1，n2，n3，n4，n5And n6The probability density functions of the white Gaussian noises respectively representing the white Gaussian noises generated by the relay, the D2D receiving end, the signal from the broadband to the baseband, the D2D receiving end, the signal from the broadband to the baseband and the base station are CN (0, sigma)0 2)；
To meet the energy efficient requirements of D2D communication, the D2D energy efficient transport constraint C1 is set as follows:
wherein,
is the energy efficiency of the D2D device,
is the transmission rate, η, of the D2D communication0Is the lowest energy efficiency of the D2D device.
2. The method of claim 1, wherein Step 5, the relay and the receiving end of D2D are respectively allocated with energy splitting ratio γ1 optimalAnd gamma2 optimalUltimately, energy efficient D2D transmission is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345984.1A CN109219026B (en) | 2018-11-13 | 2018-11-13 | D2D transmission method based on energy capture and interference cancellation in uplink relay network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345984.1A CN109219026B (en) | 2018-11-13 | 2018-11-13 | D2D transmission method based on energy capture and interference cancellation in uplink relay network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109219026A CN109219026A (en) | 2019-01-15 |
| CN109219026B true CN109219026B (en) | 2020-11-10 |
Family
ID=64996157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811345984.1A Active CN109219026B (en) | 2018-11-13 | 2018-11-13 | D2D transmission method based on energy capture and interference cancellation in uplink relay network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109219026B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2526713A1 (en) * | 2010-01-22 | 2012-11-28 | Nokia Corp. | Cellular control sensing for multi-cell device-to-device interference control |
| CN103036826A (en) * | 2011-10-05 | 2013-04-10 | 三星电子株式会社 | Relay node and method for managing interference in a multi-hop network |
| CN104301984A (en) * | 2014-10-28 | 2015-01-21 | 中国矿业大学 | Power control method based on time domain half-duplex relay in D2D cellular network |
| CN104954975A (en) * | 2015-06-23 | 2015-09-30 | 北京交通大学 | D2D (device-to-device) cooperative communication method for harvesting energy in OFDM (orthogonal frequency division multiplexing) cellular network |
| CN105471806A (en) * | 2015-12-30 | 2016-04-06 | 西安交通大学 | Interference avoidance and secure transmission method based on signal alignment for use in collaborative device-to-device (D2D) system |
| CN105554805A (en) * | 2015-12-07 | 2016-05-04 | 中国矿业大学 | In-band full duplex D2D communication link interference elimination method used for cellular network |
| CN108028676A (en) * | 2015-09-08 | 2018-05-11 | 华为技术有限公司 | For full duplex MIMO wireless radio transmissions and the full duplex MIMO radio units and method of method of reseptance |
| CN110061764A (en) * | 2019-04-17 | 2019-07-26 | 南京邮电大学 | Cooperation D2D transmission plan based on NOMA and relaying technique |
-
2018
- 2018-11-13 CN CN201811345984.1A patent/CN109219026B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2526713A1 (en) * | 2010-01-22 | 2012-11-28 | Nokia Corp. | Cellular control sensing for multi-cell device-to-device interference control |
| CN103036826A (en) * | 2011-10-05 | 2013-04-10 | 三星电子株式会社 | Relay node and method for managing interference in a multi-hop network |
| CN104301984A (en) * | 2014-10-28 | 2015-01-21 | 中国矿业大学 | Power control method based on time domain half-duplex relay in D2D cellular network |
| CN104954975A (en) * | 2015-06-23 | 2015-09-30 | 北京交通大学 | D2D (device-to-device) cooperative communication method for harvesting energy in OFDM (orthogonal frequency division multiplexing) cellular network |
| CN108028676A (en) * | 2015-09-08 | 2018-05-11 | 华为技术有限公司 | For full duplex MIMO wireless radio transmissions and the full duplex MIMO radio units and method of method of reseptance |
| CN105554805A (en) * | 2015-12-07 | 2016-05-04 | 中国矿业大学 | In-band full duplex D2D communication link interference elimination method used for cellular network |
| CN105471806A (en) * | 2015-12-30 | 2016-04-06 | 西安交通大学 | Interference avoidance and secure transmission method based on signal alignment for use in collaborative device-to-device (D2D) system |
| CN110061764A (en) * | 2019-04-17 | 2019-07-26 | 南京邮电大学 | Cooperation D2D transmission plan based on NOMA and relaying technique |
Non-Patent Citations (2)
| Title |
|---|
| Outage Performance of Energy Harvesting Relay-Assisted Device-to-Device Communication;Deeksha Agarwal等;《2017 International Conference on Wireless Communications,Signal Processing and Networking(WiSPNET)》;20170324;正文第5章 * |
| 基于网络编码的D2D通信干扰抑制研究;欧阳明生;《万方数据库》;20170726;正文第2-3节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109219026A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108601088B (en) | Cooperative communication method and system based on non-orthogonal multiple access | |
| CN104284407B (en) | Poewr control method based on full duplex relaying in the cellular network of embedded D2D | |
| CN108834112B (en) | NOMA-based relay-assisted D2D communication system power distribution method | |
| CN108667584B (en) | User throughput fair link selection method for non-orthogonal multiple access cooperative network | |
| CN104301984B (en) | Poewr control method based on time domain half-duplex relay in D2D cellular networks | |
| CN108811025B (en) | Wireless energy-carrying communication cooperative transmission scheme based on relay energy storage | |
| CN107248908B (en) | Hybrid duplex transmission method in cognitive relay network based on relay selection | |
| CN109525984B (en) | Method for improving safety rate of untrusted relay energy-carrying communication system | |
| CN109348500B (en) | Resource allocation method for meeting bidirectional SWIPT relay system under hardware damage condition | |
| CN114024640B (en) | Robust relay node selection method in full duplex energy collection relay system | |
| Di et al. | Simultaneous wireless information and power transfer in two-hop OFDM decode-and-forward relay networks | |
| CN114884550B (en) | Relay cooperative transmission method for bidirectional transmission FD multi-relay cooperative SWIPT network | |
| CN104202790B (en) | A kind of MIMO-CCRN bottleneck effect removing methods based on power adaptive | |
| Raziah et al. | An adaptive best relay selection for energy efficient cooperative D2D communications | |
| CN111542109A (en) | User peer-to-peer cooperation method based on power division under non-orthogonal multiple access | |
| CN109618350B (en) | Spectrum sharing method and system based on signal retransmission | |
| CN109219026B (en) | D2D transmission method based on energy capture and interference cancellation in uplink relay network | |
| CN110049452A (en) | Novel two stages based on NOMA cooperate Multicast Scheme | |
| CN113473388B (en) | NOMA full-duplex user cooperation secret transmission method based on artificial noise | |
| Weizheng et al. | Throughput analysis of full-duplex network coding in two-way relay channel | |
| Thakur et al. | Secrecy performance of an improved interference-aided RF energy harvesting scheme in two-way multi-antenna relay network | |
| Riihonen et al. | On the feasibility of full-duplex relaying powered by wireless energy transfer | |
| Dziri et al. | Symbol Error Probability Analysis of the Decode and Forward Relaying over the composite fading multipath/shadowing channels | |
| Eriksson et al. | Dynamic single frequency networks in wireless multihop networks-Energy aware routing algorithms with performance analysis | |
| CN104270228A (en) | Adaptive cooperative transmission method in MIMO-CCRN (Multiple Input Multiple Output-Cooperative Cognitive Radio Network) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |