CN108667584A - Non-orthogonal multiple accesses the user throughput justice link selecting method of collaborative network - Google Patents
Non-orthogonal multiple accesses the user throughput justice link selecting method of collaborative network Download PDFInfo
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- CN108667584A CN108667584A CN201810246057.8A CN201810246057A CN108667584A CN 108667584 A CN108667584 A CN 108667584A CN 201810246057 A CN201810246057 A CN 201810246057A CN 108667584 A CN108667584 A CN 108667584A
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0075—Allocation using proportional fairness
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- 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
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- 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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Abstract
The invention belongs to wireless communication technology fields, the link selecting method based on user throughput justice in a kind of non-orthogonal multiple access collaborative network (NOMA) is disclosed, i.e., improves user throughput fairness by a new power distribution thinking in collaboration base station directly network of the transmission with relay cooperative transmission and using ancillary technique is buffered：Small-power is distributed in base station to remote subscriber, is distributed to near-end user high-power；It is equipped with a unrestricted buffering of size to relaying so that relaying need not immediately be forwarded in the latter time slot after previous time slot receives signal, and adaptive determines that relay reception signal either sends signal in each time slot according to the quality of link.The present invention so that the handling capacity of remote subscriber can also be as signal-to-noise ratio increases under middle high s/n ratio by being introduced into a kind of new power distribution strategies with buffering ancillary technique, it will be apparent that improves the Throughput fairness between user.
Description
Technical field
The invention belongs to be based on using in wireless communication technology field more particularly to a kind of non-orthogonal multiple access collaborative network
The link selecting method of family throughput fairness.
Background technology
Currently, the prior art commonly used in the trade is such：Non-orthogonal multiple accesses (NOMA) can be effective as one kind
The non-orthogonal multiple access way for improving spectrum efficiency is studied concern extensively by people recently.It is connect different from traditional orthogonal multiple access
Entering mode, the channel in transmitting terminal NOMA with different capacity by multiple information flows in time domain, frequency domain, code domain overlapping is transmitted,
The superposition that multi-user is realized in power domain is multiplexed.In receiving terminal, each user recycles serial interference elimination (SIC) technology to move
Except stronger unwanted signal in mixed signal, the signal of oneself is decoded.Although NOMA technologies can be obviously improved frequency spectrum effect
Rate, but simultaneously also can the design of receiver put forward higher requirements, this is also one of the reason of originally NOMA must not be reused, now
With the enhancing of chip processing capabilities and hardware technology, but also non-orthogonal multiple access is implemented as possibility.NOMA technologies
Can realize multiple users in same subchannel superposition multiplexing, however be superimposed number be not but it is The more the better, it is existing
Show to be multiplexed the configuration that two to three users are more satisfactory in same subchannel in research.Relaying technique is logical in forth generation movement
Believe that the application in scene is very universal, it is a kind of means of highly effective lifting system performance.Its main thought is
By disposing relaying between transmitting terminal and receiving terminal so that relaying can receive the information that transmitting terminal is sent, and forward
To receiving terminal, to promote the handling capacity for receiving end subscriber.By relay node as deployment, distance when information is transmitted can
It greatly shortens, the quality of link can also be promoted well, while the coverage area of network can also further expand.
In existing literature research, the transmission mode about half-duplex relay is assumed to mostly using " one receives a hair " transmission strategy.
So-called " one receives a hair " refers to relaying and pull up a horse when next after the data that a upper time slot receives transmitting terminal transmission
For gap by the data forwarding to receiving terminal, the time delay that this operating mode of tradition relaying is brought is small, at low cost, but can not be to letter
Channel state information fully utilizes.Consider the case where one kind is likely to occur, reception is sent data to when certain time slot takes turns to relaying
End, even from channel state information can learn the time slot be relayed to receiving terminal link-quality it is excessively poor, relaying also must not
It is apparent so as to cause throughput degradation without sending.But if after traditional relaying technique is combined with buffer technology,
The improvement that the situation may be significantly.By that, using buffering, relaying can be made no longer to follow traditional " receipts at relaying
One hair " operating mode, but a time slot in office can select receive according to channel quality this moment either to send.
Relaying technique is introduced in NOMA networks can be obviously improved system performance.Since remote subscriber can in the NOMA systems of two users
Energy distance is relatively far to the link that direct transfers of base station, at this moment assists its communication with regard to needing the addition relayed.It is straight in collaboration base station
Under the NOMA downlink networks for connecing transmission and relay cooperative transmission, existing transmission strategy has remote subscriber by using near-end user
This feature of prior information is capable of providing good overall system throughput, but does not have for the throughput fairness between user
Fine consideration.
In conclusion problem of the existing technology is：Existing transmission strategy has distal end to use by using near-end user
Prior information this feature in family is capable of providing good overall system throughput, but does not have for the throughput fairness between user
There is fine consideration.This enables near-end user to be serviced well, and the service quality of remote subscriber cannot protect
Barrier, quality and near-end user difference for being serviced in other words are remote.In certain remote subscribers need the scene of high-quality service,
Existing policies cannot be satisfied.
Solve the difficulty and meaning of above-mentioned technical problem：By simply adding relaying or using buffering ancillary technique,
The present situation that remote subscriber handling capacity can not be promoted with the increase of signal-to-noise ratio under high s/n ratio in can not solving, existing power
Allocation strategy can not equally solve the problems, such as this.And as users increasingly improve the pursuit of service quality, the weight of the problem
The property wanted also slowly highlights.
Invention content
In view of the problems of the existing technology, the present invention provides a kind of non-orthogonal multiples to access in collaborative network based on use
The link selecting method of family throughput fairness.
The invention is realized in this way the chain based on user throughput justice in a kind of non-orthogonal multiple access collaborative network
Road selection method, base station in the link selecting method based on user throughput justice in non-orthogonal multiple access collaborative network
Near-end user signal is overlapped coding with remote subscriber and is sent, using successive interference cancellation techniques, is relayed first by proximal end
Subscriber signal eliminates again after solving, and then decodes the signal of remote subscriber；Same decoding process is carried out at near-end user；
Relaying forwards the signal of remote subscriber, while base station sends a new data to near-end user.
Further, the link selecting method packet based on user throughput justice in the non-orthogonal multiple access collaborative network
It includes：
1) total amount of data being stored in buffering is identical as the total amount of data of release；
2) binary integer variable di, value is merely able to be 0 or 1；Work as diWhen=0, base station sends two users' superposed signal,
Relay reception signal；Work as di=1, relay forwarding remote subscriber signal, while base station transmits a signal to near-end user；
3) constitution optimization problem model：
1) wherein C1 is corresponded to, 2) C2 is corresponded to.S2=log2(1+s2(i)) the remote subscriber handling capacity decoded for time slot i,
R2(i) handling capacity received for time slot i remote subscribers. Exist for remote subscriber signal
The decoded signal-to-noise ratio of near-end user,For remote subscriber signal at relaying decoded signal-to-noise ratio；R2(i)=min { log2(1
+γ2(i)), Q (i-1) }, wherein Q has recorded the data volume in buffering.
Further, the optimization problem, is solved using lagrange's method of multipliers, obtains optimal link transmission sequence
di, i >=1, d in each time slotiDecision rule be：
Wherein F (x)=log2(1+x) is an optimal decision function.
Further, the user throughput justice link selecting method of the non-orthogonal multiple access collaborative network specifically wraps
It includes：
Step 1 distributes small-power to remote subscriber, and is distributed to near-end user high-power；
Step 2 is equipped with a buffering at relaying；
Step 3 allows relaying to serve as Centroid in systems, is analyzed by the channel state information of acquisition, determines
The transmission state of system in the time slot；
Step 4 analyzes the average throughput of user with link selection strategy.
Further, decision function is F (x)=x, is solved to the ergodic capacity of two users, uses C1Indicate that base station is sent
The ergodic capacity of UE1, uses C when superposed signal1The ergodic capacity of UE1, uses C when ' expression base station only sends UE1 signals2Indicate UE2
Ergodic capacity, obtain：
WhereinFor the average channel gain of respective link.
Another object of the present invention is to provide be based on user in a kind of application non-orthogonal multiple access collaborative network
The wireless communication system of the link selecting method of throughput fairness.
In conclusion advantages of the present invention and good effect are：Chain provided by the invention based on user throughput justice
Road selection strategy makes the handling capacity of remote subscriber in by being introduced into a kind of new power distribution strategies with buffering ancillary technique
It can also increase with signal-to-noise ratio under high s/n ratio, it will be apparent that improve the Throughput fairness between user.
Description of the drawings
Fig. 1 is the chain based on user throughput justice in non-orthogonal multiple access collaborative network provided in an embodiment of the present invention
Road selection method flow chart.
Fig. 2 is the chain based on user throughput justice in non-orthogonal multiple access collaborative network provided in an embodiment of the present invention
Road selection method implementation flow chart.
Fig. 3 is application transport schematic diagram of a scenario provided in an embodiment of the present invention.
Fig. 4 is simulation result schematic diagram provided in an embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The present invention is in order to overcome the prior art to be deposited in collaboration base station directly NOMA network of the transmission with relay cooperative transmission
Deficiency, a kind of link selection algorithm based on Throughput fairness is provided, in the case where not influencing overall system throughput,
Improve the Throughput fairness between user.
As shown in figure 3, the user throughput justice chain of non-orthogonal multiple access collaborative network provided in an embodiment of the present invention
Road selection method includes the following steps：
S101：Change power distribution thinking.In NOMA networks, traditional power distribution thinking is to distribute big work(to remote user
Rate distributes small-power to nearly user.Small-power is distributed to remote user (UE2) in the present invention, and big work(is distributed to nearly user (UE1)
Rate；
S102：A buffering is equipped at relaying.Relaying need not receive signal in a upper time slot after having buffering
It is immediately forwarded later in next time slot, but adaptive relay reception is determined according to the quality of link in each time slot
Signal either sends signal；
S103：It allows relaying to serve as Centroid in systems, is analyzed by the channel state information of acquisition, determining should
The transmission state of system in time slot；
S104：With link selection strategy, the average throughput of user is analyzed.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
After step S101 and step S102 is executed, under the system model there are two types of transmission state it is possible that：
The first：Base station is by UE1 signals x1With UE2 signals x2It is overlapped coding to send, relaying utilizes string with UE1
Row interference cancellation techniques decode two user data to come；
Second：The data of relay forwarding UE2, while base station sends a new data x1' arrive UE1.Since relaying turns
The information of hair has been solved by UE1 in time slot before, so will not be interfered to it.
Further, after using buffering ancillary technique, relaying is no longer the operating mode of " one receives a hair ", optimal transmission plan
Derivation slightly is as follows：
Step 1：Define a binary integer variable di, value is merely able to be 0 or 1.Work as diWhen=0, system is in above-mentioned
The first situation.Work as di=1, system is in above-mentioned the second situation.
Step 2：For the relay cooperative user of buffering auxiliary, to realize the maximization of handling capacity, need to ensure
" receiving-transmitting balance " of data, i.e. E { (1-d at bufferingi)S2(i) }=E { diR2(i) }, wherein S2(i) and R2(i) it is time slot i relayings
Reception data and transmission data.
Step 3：Consider that optimization aim is the handling capacity of UE2, while to be limited to the limit of step 1 and two conditions of step 2
System, constructs following optimization problem model：
Wherein S2(i)=log2(1+s2(i)), It is solved at UE1 for UE2 signals
The signal-to-noise ratio of code,For UE2 signals at relaying decoded signal-to-noise ratio, relaying decoding forwarding system in need to two
Person, which takes, small finds out the data volume that time slot UE2 real decoders go out.R2(i)=min { log2(1+γ2(i)), Q (i-1) }, wherein
Q have recorded buffering in data volume, it is contemplated that sometimes buffer in data deficiencies the case where it is possible that, need there are one take it is small
Process.
Step 4：It for the optimization problem described in step 3, is solved using lagrange's method of multipliers, lists glug
Bright day function：
Wherein βiIt is Lagrange coefficient with μ.To L with regard to diDifferential is carried out, juxtaposition is as a result 0 can obtain：
Due to known diValue be only 0 or 1, therefore βiValue only there are two types of may, work as diIt can be found out when=0
βi,1=(1- μ) R (i)-μ S (i), work as diβ can be found out when=1i,2=-βi.1.For L, it is also necessary to meetBy into
The analysis of one step finds, no matter R2(i) and S2(i) how value, always have d as μ≤0i=1, always there is d as μ >=1i=0, because
This μ obtained needs to meet 0 ＜ μ ＜ 1.To diTwo kinds of value conditions carry out analyzing and can obtaining respectively：
Define a decision thresholdAnd optimal link decision function F (x)=log2(1+x) can be obtained
The optimum link transmission strategy for capableing of maximize handling capacity is as follows：
Step 5：In view of decision function is F (x)=log2Computation complexity is higher when (1+x), considers F (x)=x here
The case where, the ergodic capacity of two users is solved, we use C1Indicate that the traversal of UE1 when base station sends superposed signal is held
Amount, uses C1The ergodic capacity of UE1, uses C when ' expression base station only sends UE1 signals2The ergodic capacity for indicating UE2, by some numbers
Can be calculated：
WhereinFor the average channel gain of respective link.
Step 6：As shown in figure 4, simulating conventional measures and two users' handling capacity under the put forward strategy of the present invention, it can be seen that
The handling capacity of two users is increasingly approached with the promotion of signal-to-noise ratio under the carried strategy of the present invention, that is, has good user throughput
Fairness.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (6)
1. the link selecting method based on user throughput justice in a kind of non-orthogonal multiple access collaborative network, feature exist
In proximal end is used in base station in the link selecting method based on user throughput justice in the non-orthogonal multiple access collaborative network
Family signal is overlapped coding with remote subscriber and sends, and using successive interference cancellation techniques, relays first by near-end user signal
It is eliminated again after solving, then decodes the signal of remote subscriber；Same decoding process is carried out at near-end user；Relaying will be remote
The signal of end subscriber forwards, while base station sends a new data to near-end user.
2. the link selection side based on user throughput justice in non-orthogonal multiple access collaborative network as described in claim 1
Method, which is characterized in that the link selecting method packet based on user throughput justice in the non-orthogonal multiple access collaborative network
It includes：
1) total amount of data being stored in buffering is identical as the total amount of data of release；
2) binary integer variable di, value is merely able to be 0 or 1；Work as diWhen=0, base station sends user's superposed signal, and relaying connects
The collection of letters number；Work as di=1, relay forwarding remote subscriber signal, while base station sends a new signal to near-end user；
3) constitution optimization problem model：
Maximize:
Subject to:C1:
C2:
1) wherein C1 is corresponded to, 2) C2 is corresponded to；S2=log2(1+s2(i)) the remote subscriber handling capacity decoded for time slot i, R2(i)
The handling capacity received for time slot i remote subscribers； It is remote subscriber signal in proximal end
Decoded signal-to-noise ratio at user,For remote subscriber signal at relaying decoded signal-to-noise ratio；R2(i)=min { log2(1+
γ2(i)), Q (i-1) }, wherein Q has recorded the data volume in buffering.
3. the link selection side based on user throughput justice in non-orthogonal multiple access collaborative network as claimed in claim 2
Method, which is characterized in that the optimization problem is solved using lagrange's method of multipliers, obtains optimal link transmission sequence
di, i >=1, d in each time slotiDecision rule be：
Wherein F (x)=log2(1+x) is an optimal decision function.
4. the link selection side based on user throughput justice in non-orthogonal multiple access collaborative network as described in claim 1
Method, which is characterized in that the link selecting method tool based on user throughput justice in the non-orthogonal multiple access collaborative network
Body includes：
Step 1 distributes small-power to remote subscriber, and is distributed to near-end user high-power；
Step 2 is equipped with a buffering at relaying；
Step 3 allows relaying to serve as Centroid in systems, is analyzed by the channel state information of acquisition, when determining this
The transmission state of system in gap；
Step 4 analyzes the average throughput of user with link selection strategy.
5. the link selection side based on user throughput justice in non-orthogonal multiple access collaborative network as claimed in claim 4
Method, which is characterized in that decision function is F (x)=x, is solved to the ergodic capacity of two users, uses C1It is folded to indicate that base station is sent
The ergodic capacity of near-end user, uses C when plus signal1' indicate that the traversal of near-end user when base station only sends near-end user signal is held
Amount, uses C2The ergodic capacity for indicating remote subscriber, obtains：
WhereinFor the average channel gain of respective link.
6. being based on user throughput in non-orthogonal multiple access collaborative network described in a kind of application Claims 1 to 5 any one
The wireless communication system of fair link selecting method.
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| CN109890031A (en) * | 2019-03-11 | 2019-06-14 | 重庆邮电大学 | A kind of more relaying non-orthogonal multiple system safe transmission schemes based on man made noise |
| CN109890031B (en) * | 2019-03-11 | 2022-03-01 | 重庆邮电大学 | Multi-relay non-orthogonal multiple access system safe transmission method based on artificial noise |
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| CN112566254B (en) * | 2020-11-18 | 2022-07-12 | 西北工业大学 | Unmanned aerial vehicle relay method based on non-orthogonal multiple access, storage medium and equipment |
| CN112887042A (en) * | 2021-01-22 | 2021-06-01 | 重庆邮电大学 | Energy-carrying communication network user pairing method based on non-orthogonal multiple access |
| CN112887042B (en) * | 2021-01-22 | 2022-06-10 | 重庆邮电大学 | Energy-carrying communication network user pairing method based on non-orthogonal multiple access |
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| CN114339884A (en) * | 2021-12-27 | 2022-04-12 | 绍兴文理学院 | Two-user bidirectional transmission cooperation non-orthogonal multiple access method and system |
| CN114339884B (en) * | 2021-12-27 | 2024-04-26 | 绍兴文理学院 | Two-user bidirectional transmission cooperation non-orthogonal multiple access method and system |
| CN114339977A (en) * | 2022-01-07 | 2022-04-12 | 重庆邮电大学 | Power distribution method based on full-duplex cooperative NOMA system |
| CN116866949A (en) * | 2023-07-12 | 2023-10-10 | 广东工业大学 | Energy buffer-assisted adaptive wireless power supply cooperation NOMA method and system |
| CN116866949B (en) * | 2023-07-12 | 2024-01-30 | 广东工业大学 | Energy buffer-assisted adaptive wireless power supply cooperation NOMA method and system |
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