CN105007113B - A kind of bi-directional relaying communication means of information and exchange energy - Google Patents
A kind of bi-directional relaying communication means of information and exchange energy Download PDFInfo
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- CN105007113B CN105007113B CN201510426970.2A CN201510426970A CN105007113B CN 105007113 B CN105007113 B CN 105007113B CN 201510426970 A CN201510426970 A CN 201510426970A CN 105007113 B CN105007113 B CN 105007113B
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- 238000004891 communication Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 238000003306 harvesting Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000003032 molecular docking Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 230000008030 elimination Effects 0.000 claims abstract description 4
- 238000003379 elimination reaction Methods 0.000 claims abstract description 4
- 239000000284 extract Substances 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 230000011218 segmentation Effects 0.000 claims abstract description 4
- 238000005457 optimization Methods 0.000 claims description 8
- 239000000654 additive Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a kind of information and the bi-directional relaying communication means of exchange energy, the described method includes：One bi-directional relaying transmission frame is divided into two equal time slots；In time slot 1, source node sends an information signal to relay node, while destination node sends an energy signal to relay node；After relay node receives signal, energy is obtained using power segmentation protocol；In time slot 2, relay node decodes the information into signal amplification forwarding to source node and destination node, and source node directly obtains energy from reception signal；The destination node docking collection of letters number carries out a self-interference elimination, extracts information signal.The present invention can be used for two terminals to pass through a relay node completion information and the wireless communication system of exchange energy, including body area network, transponder etc., have many advantages, such as that realization is simple, applied widely, energy harvesting and transmission request message can be met simultaneously, the rate of information throughput can be maximized under energy harvesting constraint.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to the bi-directional relaying communication means of a kind of information and exchange energy.
Background technology
The method that researcher has devised a variety of wireless messages and energy simultaneous transmission at present, the communication system being related to
System includes MIMO, OFDM, relaying etc..Energy receiver has separate type, it is therefore an objective to maximize information under energy harvesting constraint
Transmission rate；Also there is wireless energy supply communicatively, transferred with the energy of harvest to complete information, maximize the rate of information throughput；
Then having time switching and power split two kinds to energy harvesting pattern.The above method does not all account for information and exchange energy
Problem, in the wireless communication systems such as body area network, transponder, energy is conveyed to another terminal by a terminal, simultaneously also
The information from other side is received, this relates to information between terminal and exchange energy, it is necessary to a kind of corresponding wireless communication
Breath and energy simultaneous transmission method.
The content of the invention
The present invention provides the bi-directional relaying communication means of a kind of information and exchange energy, can be under energy harvesting constraint most
The bigization rate of information throughput.The present invention can be used for two terminals to complete the wireless of information and exchange energy by a relay node
Communication system, including body area network, transponder etc., have realize it is simple, applied widely, energy harvesting and letter can be met simultaneously
The advantages that ceasing transmission requirement.
A kind of bi-directional relaying communication means of information and exchange energy, the described method includes：
(1) a bi-directional relaying transmission frame is divided into two equal time slots.
(2) in time slot 1, source node sends an information signal to relay node, while destination node sends an energy
Signal is to relay node.
(3) after relay node receives signal, energy is obtained using power segmentation protocol.
(4) in time slot 2, relay node decodes the information into signal amplification forwarding to source node and destination node, and source node is straight
It connects and obtains energy from reception signal.
(5) the destination node docking collection of letters number carries out a self-interference elimination, extracts information signal.
Description of the drawings
Fig. 1 is wireless messages and exchange energy Transmission system schematic diagram.
Fig. 2 is wireless messages and exchange energy transmission method schematic diagram.
Specific embodiment
The two-way relay communication system of information and exchange energy includes a source node S, a relay node R and a mesh
Node D.All nodes are all semiduplex, and an antenna is only housed.Source node S carries little energy, by the energy of acquisition
Continuous firing is measured, relay node R is energized without external, and signal forwarding, mesh are completed by energy is obtained from received signal
Node D possess sufficient energy.One bi-directional relaying transmission frame is divided into two equal time slots.In time slot 1, source node S hair
An information signal is sent to give relay node R, while destination node D sends an energy signal and gives relay node R, relay node R
After signal is received, (power splitting) agreement is split using power and obtains energy.In time slot 2, relay node R will believe
Decoded signal amplification forwarding is ceased to source node S and destination node D.Source node S directly obtains energy from reception signal, is denoted as
(J).The destination node D docking collections of letters number carry out a self-interference elimination, extract information signal.Information transmission speed at destination node D
Rate is denoted as C (bit/s), and the gain amplifier at relay node is denoted as β.
Energy is obtained using power segmentation protocol, is to be split according to optimal power splitting ratio and obtained by following manner
：The information at destination node D is maximized under the transmission power constraint of relay node R and the energy harvesting constraint of source node S
It is as follows to establish optimization problem for transmission rate：
Wherein：ρ is power splitting ratio；β is the gain amplifier of relay node R；C is the information transmission at destination node D
Rate；S.t. represent it is constrained in；Λ is the threshold value that the energy as acquired in relay node R determines；Γ is that the minimum of source node S obtains
Take energy requirement.
To the optimization problem solving, optimal power splitting ratio ρ and relaying gain amplifier β are obtained.If it is convex,
It is solved using lagrange's method of multipliers；If it is non-convex, convex optimization problem first is converted it to fractional programming etc., then is used
Lagrange's method of multipliers or interior point method solve.After obtaining optimal power splitting ratio and gain amplifier, relay node R docking
The processing of the collection of letters number determines completely.
The present invention is described in further details with reference to the accompanying drawings and embodiments, in favor of more fully understanding the present invention.
As shown in Figure 1, in time slot 1, the signal that relay node R is received is represented by：
Wherein PDAnd PSIt is the transmission power of destination node D and source node S respectively, e (t) and s (t) are destination node D respectively
With the transmission signal of source node S, their orthogonal and averages are 0, normalized square mean 1, hDRAnd hSRIt is purpose section respectively
The channel coefficients of point D, source node S to relay node R, n (t) be average be zero, variance σ2Additive white Gaussian noise.If institute
There is channel to undergo quasi-static Rayleigh block decline, channel coefficients remain unchanged in a transmission frame, needed for known to all nodes
Channel state information.
Relay node R will receive signal and be divided into two parts, and a part turns for energy harvesting, a part for signal
Hair.The energy balane of relay node R harvests is E=η ρ (PD|hDR|2+PS|hSR|2) T, wherein η be energy conversion efficiency, 0 ＜ η≤
1, T is slot length.
If bidirectional relay channel is mutual induction.In time slot 2, the reception signal of destination node D and source node S is expressed as：
WhereinnD(t) and nS(t) be average be zero, variance σ2
Additive white Gaussian noise.
After destination node D eliminates self-interference, the information signal extracted is expressed as：
The rate of information throughput at destination node D can be expressed as：
It is constrained by the transmission power of relay node R, gain amplifier β must is fulfilled for：
Source node S obtain energy balane be：
Optimization problem is established as：
For β, when it is maximized, R andAlso maximum is got.Therefore β should take：
In addition, maximizing C is equivalent to maximizationMake A=PD|hDR|2+PS|hSR|2, it is above-mentioned excellent
Changing problem reduction is：
First constraints is One- place 2-th Order inequality, and after solution and second constraints merging can obtain ρ's
Value border.Object function is non-convex, but its molecule ψ (ρ) be it is non-negative, recessed, denominator φ (ρ) be just, it is convex.It introduces
VariableAbove-mentioned optimization problem can be converted into a convex optimization problem with fractional programming equivalence, emit
It is solved to obtain the optimal of c and d with interior point method in the case of known to power, channel coefficients, noise power, energy conversion efficiency are whole
Value c* and d*；The optimal value of ρ is exactlyThen optimal β value can be obtained.
Claims (1)
1. the bi-directional relaying communication means of a kind of information and exchange energy, the described method includes：
One bi-directional relaying transmission frame is divided into two equal time slots；In time slot 1, source node sends an information signal in
After node, while destination node sends an energy signal to relay node；After relay node receives signal, split using power
Agreement obtains energy；In time slot 2, relay node decodes the information into signal amplification forwarding to source node and destination node, source node
Directly energy is obtained from reception signal；The destination node docking collection of letters number carries out a self-interference elimination, extracts information signal；
Wherein：The relay node uses power segmentation protocol to obtain energy after receiving signal, is according to the optimal power ration of division
Rate is split and is obtained by following manner：
(1) maximized under the transmission power constraint of relay node R and the energy harvesting constraint of source node S at destination node D
It is as follows to establish optimization problem for the rate of information throughput：
<mrow>
<mtable>
<mtr>
<mtd>
<mrow>
<munder>
<mi>max</mi>
<mrow>
<mi>&rho;</mi>
<mo>,</mo>
<mi>&beta;</mi>
</mrow>
</munder>
<mi>C</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>s</mi>
<mo>.</mo>
<mi>t</mi>
<mo>.</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>&beta;</mi>
<mo>&le;</mo>
<mi>&Lambda;</mi>
<mo>,</mo>
<mover>
<mi>E</mi>
<mo>~</mo>
</mover>
<mo>&GreaterEqual;</mo>
<mi>&Gamma;</mi>
<mo>,</mo>
<mn>0</mn>
<mo>&le;</mo>
<mi>&rho;</mi>
<mo>&le;</mo>
<mn>1</mn>
</mrow>
</mtd>
</mtr>
</mtable>
<mo>;</mo>
</mrow>
Wherein：ρ is optimal power splitting ratio, and β is the gain amplifier of relay node R, and C is the information transmission at destination node D
Rate, s.t. represent constrained in Λ is the threshold value that the energy as acquired in relay node R determines, Γ is that the minimum of source node S obtains
Take energy requirement；It is the energy that source node S is directly obtained from reception signal；
(2) to the optimization problem solving, optimal power splitting ratio and relaying gain amplifier are obtained.
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| CN105007113B true CN105007113B (en) | 2018-06-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850031B (en) * | 2016-12-06 | 2019-09-24 | 浙江工业大学 | A kind of power distribution method in multiple antennas bi-directional relaying Transmission system |
| CN106656275B (en) * | 2016-12-07 | 2020-01-14 | 深圳大学 | Wireless radio frequency communication method and system |
| CN106792918B (en) * | 2016-12-12 | 2020-06-19 | 华南理工大学 | Multi-user cooperative communication method and system based on wireless energy transmission |
| CN107995680B (en) * | 2017-12-11 | 2020-10-30 | 天津工业大学 | SWIPT relay power division coefficient adjusting method with interference energy collection function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469952A (en) * | 2014-11-13 | 2015-03-25 | 西安交通大学 | Transmitting method based on optimal power division in wireless information and energy synchronous transmission relay network |
| CN104780601A (en) * | 2015-04-24 | 2015-07-15 | 西安交通大学 | Iteration dynamic power separation method in multiple relay channel energy synchronous transmission networks |
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2015
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469952A (en) * | 2014-11-13 | 2015-03-25 | 西安交通大学 | Transmitting method based on optimal power division in wireless information and energy synchronous transmission relay network |
| CN104780601A (en) * | 2015-04-24 | 2015-07-15 | 西安交通大学 | Iteration dynamic power separation method in multiple relay channel energy synchronous transmission networks |
Non-Patent Citations (1)
| Title |
|---|
| Throughput and Ergodic Capacity of Wireless Energy Harvesting Based DF Relaying Network;Ali A. Nasir、Xiangyun Zhou、Salman Durrani和Rodney A. Kennedy;《IEEE》;20141231;说明书第4066页第Ⅰ节、第4067页Ⅱ节、第4068-4069页第Ⅳ节；附图2 * |
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