CN108768479A - A kind of power distribution method and system based on instantaneous channel state information - Google Patents
A kind of power distribution method and system based on instantaneous channel state information Download PDFInfo
- Publication number
- CN108768479A CN108768479A CN201810415810.1A CN201810415810A CN108768479A CN 108768479 A CN108768479 A CN 108768479A CN 201810415810 A CN201810415810 A CN 201810415810A CN 108768479 A CN108768479 A CN 108768479A
- Authority
- CN
- China
- Prior art keywords
- node
- signal
- power
- subcarrier
- noise ratio
- 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.)
- Granted
Links
Classifications
-
- 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
- H04B7/0426—Power distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
Abstract
The invention discloses a kind of power distribution method and system based on instantaneous channel state information.The method and system initially set up space time collaboration system model, and analyze in the space time collaboration system model Between Signal To Noise Ratio end to end, and the power allocation factor of subcarrier is determined according to the signal-to-noise ratio end to end；The transmission power that each subcarrier in the space time collaboration system model is distributed according to the power allocation factor, so as to obtain more preferably system break performance.
Description
Technical field
The present invention relates to cooperative communication technology field, more particularly to a kind of power distribution based on instantaneous channel state information
Method and system.
Background technology
Collaboration diversity is that decline, Extension of service covering surface, an important skill for improving power system capacity are overcome in wireless network
Art.The terminal node of single antenna shares respective antenna each other according to certain mode in cooperative system, is formed virtual how defeated
Enter multi output (Multiple-Input Multiple-Output, MIMO) transmission and receiving array, to obtain higher point
Diversity gain.In partner systems, it is amplification forwarding (Amplify-and-forward, AF) and decoding that typical cooperation mode, which has,
It forwards (Decode-and-forward, DF).AF is easier to realize, but it can also amplify while amplifying useful signal and makes an uproar
Sound.Data of the relay reception from source node in DF cooperation schemes decode, and re-encoding is finally transmitted again, is eliminated and is received
The noise adulterated in signal.Experiment so far is it has been proved that under low signal-to-noise ratio conditions, the performance of AF agreements wants excellent
In DF agreements, but when noise is relatively high, the performance of DF agreements is better than AF agreements.
Network coding technique has prodigious potentiality in terms of improving resource efficiency and network throughput.In cooperating relay technology
The thought of middle application network coding, collaboration diversity system can be improved in the case where not needing extra frequency resource and transmission power
The validity and reliability of system, Space Time Coding transmitting diversity technology is suggested in many documents, but it is suitable only for
Flat fading channel, but under the conditions of frequency-selective channel, the code-element period of space -time code is less than the delay spread of multipath fading,
Serious intersymbol interference, system break performance can be caused bad.
Invention content
The object of the present invention is to provide a kind of power distribution method and system based on instantaneous channel state information, pass through by
Orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) and Space Time Coding skill
Art (space-time coding, STC) is combined, propose a kind of total transmission power it is certain based on instantaneous channel state information
Power allocation scheme, to obtain more preferably system break performance.
To achieve the above object, the present invention provides following schemes：
A kind of power distribution method based on instantaneous channel state information, the power distribution method include the following steps：
Establish space time collaboration system model；The space time collaboration system model includes source node, relay node and purpose section
Point；
Signal-to-noise ratio end to end is obtained according to the space time collaboration system model；The signal-to-noise ratio end to end includes direct transferring
Signal-to-noise ratio and cooperation signal-to-noise ratio；
The power allocation factor of subcarrier is determined according to the signal-to-noise ratio end to end；
The transmission power of each subcarrier in the space time collaboration system model is distributed according to the power allocation factor.
Optionally, described to establish space time collaboration system model, it specifically includes：
Establish the space time collaboration system model；The space time collaboration system model includes source node, relay node and mesh
Node；Each node in the space time collaboration system model is provided with single antenna, between node using semiduplex mode into
Row communication；The OFDM modulation that the source node and the destination node are all made of N is transmitted；
The frequency domain channel of wherein source node to relay node is HSR={ HSR(1),HSR(2),...,HSR(N)}；Wherein HSR
(i), i-th subchannel of the i=1,2...N expression source nodes to relay node；
The frequency domain channel of wherein relay node to destination node is HRD={ HRD(1),HRD(2),...,HRD(N)}；Wherein
HRD(i), i-th subchannel of the i=1,2...N expression relay nodes to destination node；
The frequency domain channel of wherein source node to destination node is HSD={ HSD(1),HSD(2),...,HSD(N)}；Wherein HSD
(i), i-th subchannel of the i=1,2...N expression source nodes to destination node.
Optionally, described that signal-to-noise ratio end to end is obtained according to the space time collaboration system model, it specifically includes：
According to formula γdirect=2 βdirect,iγ|HSD(i)|2Direct transfer signal-to-noise ratio described in determination；Wherein γdirectIndicate straight
Pass signal-to-noise ratio, βdirect,iThe power allocation factor for i-th of subcarrier that source node is sent when to direct transfer；γ is total signal-to-noise ratio；HSD
(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；
According to formulaDetermine the cooperation noise
Than；Wherein γcoIndicate cooperation signal-to-noise ratio；βco,iThe power allocation factor for i-th of subcarrier that source node is sent when to cooperate；α
For the power allocation factor of source node；HSD(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；
It is the power allocation factor for i-th of subcarrier that relay node is sent；HRD(i), i=1,2...N indicates relay node to purpose
I-th of subchannel of node.
Optionally, signal-to-noise ratio determines the power allocation factor of subcarrier end to end described in the basis, specifically includes：
According to formulaDetermine the power point for i-th of subcarrier that source node is sent when direct transferring
With the factor；
According to formulaThe power point for i-th of subcarrier that source node is sent when determining cooperation
With the factor；
According to formulaDetermine the power allocation factor for i-th of subcarrier that relay node is sent.
Optionally, described to distribute each subcarrier in the space time collaboration system model according to the power allocation factor
Transmission power specifically includes：
According to power allocation factor βdirect,iThe power for i-th of subcarrier that source node is sent when distribution direct transfers；
According to power allocation factor βco,iThe power for i-th of subcarrier that source node is sent when distribution cooperation；
According to power allocation factorDistribute the power for i-th of subcarrier that relay node is sent.
The present invention also provides a kind of power distribution system based on instantaneous channel state information, the power distribution systems
Including：
System model establishes module, for establishing space time collaboration system model；The space time collaboration system model includes source
Node, relay node and destination node；
Signal-to-noise ratio acquisition module, for obtaining signal-to-noise ratio end to end according to the space time collaboration system model；The end
Signal-to-noise ratio to end includes direct transfer signal-to-noise ratio and cooperation signal-to-noise ratio；
Power allocation factor determining module, for according to end to end signal-to-noise ratio determine the power distribution of subcarrier because
Son；
Power distribution module, for being distributed in the space time collaboration system model per height according to the power allocation factor
The transmission power of carrier wave.
Optionally, the system model is established module and is specifically included：
System model establishes unit, for establishing the space time collaboration system model；The space time collaboration system model packet
Include source node, relay node and destination node；Each node in the space time collaboration system model is provided with single antenna, node
Between communicated using semiduplex mode；The OFDM modulation that the source node and the destination node are all made of N is passed
It is defeated；
The frequency domain channel of wherein source node to relay node is HSR={ HSR(1),HSR(2),...,HSR(N)}；Wherein HSR
(i), i-th subchannel of the i=1,2...N expression source nodes to relay node；
The frequency domain channel of wherein relay node to destination node is HRD={ HRD(1),HRD(2),...,HRD(N)}；Wherein
HRD(i), i-th subchannel of the i=1,2...N expression relay nodes to destination node；
The frequency domain channel of wherein source node to destination node is HSD={ HSD(1),HSD(2),...,HSD(N)}；Wherein HSD
(i), i-th subchannel of the i=1,2...N expression source nodes to destination node.
Optionally, the signal-to-noise ratio acquisition module specifically includes：
Direct transfer signal-to-noise ratio determination unit, for according to formula γdirect=2 βdirect,iγ|HSD(i)|2It direct transfers described in determination
Signal-to-noise ratio；Wherein γdirectExpression direct transfers signal-to-noise ratio, βdirect,iThe power point for i-th of subcarrier that source node is sent when to direct transfer
With the factor；γ is total signal-to-noise ratio；HSD(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；
Cooperate signal-to-noise ratio determination unit, for according to formula
Determine the cooperation signal-to-noise ratio；Wherein γcoIndicate cooperation signal-to-noise ratio；βco,iI-th of subcarrier that source node is sent when to cooperate
Power allocation factor；α is the power allocation factor of source node；HSD(i), i=1,2...N indicates that source node arrives destination node
I-th of subchannel；It is the power allocation factor for i-th of subcarrier that relay node is sent；HRD(i), i=1,2...N is indicated
I-th subchannel of the relay node to destination node.
Optionally, the power allocation factor determining module specifically includes：
Direct transfer power allocation factor determination unit, for according to formulaSource when determination direct transfers
The power allocation factor for i-th of subcarrier that node is sent；
Collaboration power distribution factor determination unit, for according to formulaSource when determining cooperation
The power allocation factor for i-th of subcarrier that node is sent；
Relay node power allocation factor determination unit, for according to formulaDetermine relaying section
The power allocation factor for i-th of subcarrier that point is sent.
Optionally, the power distribution module, specifically includes：
Direct transfer power distributing unit, for according to power allocation factor βdirect,iSource node is sent when distribution direct transfers i-th
The power of a subcarrier；
Collaboration power allocation unit, for according to power allocation factor βco,iSource node is sent when distribution cooperation i-th
The power of subcarrier；
Relay power allocation unit, for according to power allocation factorDistribute i-th of subcarrier that relay node is sent
Power.
According to specific embodiment provided by the invention, the invention discloses following technique effects：
The invention discloses a kind of power distribution method and system based on instantaneous channel state information the method and be
System initially sets up space time collaboration system model, and analyzes in the space time collaboration system model Between Signal To Noise Ratio end to end, root
The power allocation factor of subcarrier is determined according to the signal-to-noise ratio end to end；When described empty according to power allocation factor distribution
The transmission power of each subcarrier in cooperative system model, so as to obtain more preferably system break performance.
In addition, Space Time Coding transmitting diversity technology, under the conditions of frequency-selective channel, the code-element period of space -time code is less than
The delay spread of multipath fading can lead to serious intersymbol interference.Work(provided by the invention based on instantaneous channel state information
Rate distribution method and system can efficiently reduce the frequency selection of wireless channel by the way that OFDM to be combined with Space-Time Codes
Property, the shortcomings that compensating for space -time code, while realizing optimal multipath and space diversity gain.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of the power distribution method based on instantaneous channel state information provided by the invention；
Fig. 2 is the structural schematic diagram for the space time collaboration system model that the present invention establishes；
Fig. 3 is the schematic diagram provided by the invention in II space-time coded signal repeating process of time slot I and time slot；
Fig. 4 is the schematic diagram provided by the invention in IV space-time coded signal repeating process of time slot III and time slot；
Fig. 5 is the graph of relation between the signal-to-noise ratio and outage probability provided by the invention for emulating and obtaining；
Fig. 6 is a kind of structure chart of the power distribution system based on instantaneous channel state information provided by the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of power distribution method and system based on instantaneous channel state information, pass through by
Orthogonal frequency division multiplexi is combined with Space-Time Codes, proposes a kind of power distribution side based on instantaneous channel state information
Case, to obtain more preferably system break performance.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Mode is applied to be described in further detail invention.
Fig. 1 is a kind of flow chart of the power distribution method based on instantaneous channel state information provided by the invention.Such as Fig. 1
Shown, power distribution method provided by the invention includes the following steps：
Step 101：Establish space time collaboration system model.
Fig. 2 is the structural schematic diagram for the space time collaboration system model that the present invention establishes.Referring to Fig. 2, the space time collaboration system
System model includes source node S, relay node R and destination node D, and each node is provided with single antenna, half-duplex is used between node
Mode communicated.The OFDM modulation that node S and R are all made of N is transmitted, HSR、HRDAnd HSDIndicate that S to R, R are arrived respectively
The frequency domain channel of D and S to D.Wherein：
HSR={ HSR(1),HSR(2),...,HSR(N)}；
HRD={ HRD(1),HRD(2),...,HRD(N)}；
HSD={ HSD(1),HSD(2),...,HSD(N)}；
It is transmitted using DF agreements between node, relay node R receives the signal of source node S, carries out demodulation coding, right
Demodulated signal carry out cyclic redundancy check code (Cyclic Redundancy Check, CRC) detect, if being properly received into
Row forwarding, specific transmission process are as shown in Figure 3 and Figure 4.
Relaying time slot source node and relay node transmission use Alamouti Space Time Coding (space-time block coding,
SpaceTime Block Code, STBC)：
C is the encoder matrix of Alamouti, S in above formula1And S2It is the transmission signal of two continuous slots,WithRespectively
Indicate signal S1And S2Take complex conjugate.
Space Time Coding transmitting diversity technology is only applicable to flat fading channel, under the conditions of frequency-selective channel, when empty
The code-element period of code is less than the delay spread of multipath fading, can lead to serious intersymbol interference.As a kind of efficient multicarrier
Modulation, orthogonal frequency division multiplexing (OFDM) technology can resist wireless multipath fading, and have the higher availability of frequency spectrum.?
In OFDM technology, when number of subcarriers is much larger than number of taps, by means of OFDM transmission, frequency-selective channel can be every
Mutually independent flat fading channel is broken down on a subcarrier.Therefore the present invention mutually ties OFDM with Space-Time Codes
It closes, the shortcomings that the frequency selectivity of wireless channel can be efficiently reduced, make up space -time code, while realizing optimal multipath and space point
Diversity gain.
Fig. 3 is the schematic diagram provided by the invention in II space-time coded signal repeating process of time slot I and time slot.
Fig. 4 is the schematic diagram provided by the invention in IV space-time coded signal repeating process of time slot III and time slot.In Fig. 3 and
In Fig. 4, the signal of oneself is broadcast to destination node D in time slot I and III source node S, as additional sample of signal, with time slot
II and IV space -time code receives signal and carries out maximum-ratio combing, so the bit error rate can reduce accordingly.
Step 102：Signal-to-noise ratio end to end is obtained according to the space time collaboration system model.
It referring to Fig. 3 and Fig. 4, receives signal and is divided into four time slots, it is assumed that the channel between all nodes is in sending cycle
Accurate static slow fading rayleigh channel.If the transmission signal of source node is：
S1={ S1(1),S1(2),...,S1(N)}
S2={ S2(1),S2(2),...,S2(N)}
Wherein, S1Indicate the transmission signal of I source node of time slot, S2Indicate II source node of time slot transmission signal, time slot I with
Time slot II is two continuous slots.
The signal that source node is sent is received in I destination node of time slot and relay node, can be described as
Wherein, YD1(i) the reception signal of time slot I destination node, i-th of subchannel is indicated；P1For the transmission work(of source node S
Rate；HSD(i) i-th subchannel of the expression source node to destination node；S1(i) hair of time slot I source node, i-th of subchannel is indicated
The number of delivering letters；ND1(i) noise signal of time slot I destination node, i-th of subchannel is indicated.
YR1(i) the reception signal of time slot I relay node, i-th of subchannel is indicated；HSR(i) indicate that source node is saved to relaying
I-th of subchannel of point；NR1(i) noise signal of time slot I relay node, i-th of subchannel is indicated.
The reception signal of II destination node of time slot is：
Wherein, YD2(i) the reception signal of time slot II destination node, i-th of subchannel is indicated；P1And P2Respectively source node S
With the transmission power of relay node R；S2(i) the transmission signal of time slot II source node, i-th of subchannel is indicated；HRD(i) in indicating
After i-th of subchannel of node to destination node；Indicate the transmission signal of time slot II relay node, i-th of subchannel；ND2
(i) noise signal of time slot II destination node, i-th of subchannel is indicated.
Wherein ND1(i)、NR1(i) and ND2(i) it is noise sequence, it is 0 to meet mean value, variance N0Multiple Gauss distribution.
III destination node of time slot and relay node receive the signal that source node is sent, and can be described as：
Wherein, YD3(i) the reception signal of time slot III destination node, i-th of subchannel is indicated；Indicate III source of time slot section
The transmission signal of i-th of subchannel of point；ND3(i) noise signal of time slot III destination node, i-th of subchannel is indicated.YR3(i) table
Show the reception signal of time slot III relay node, i-th of subchannel；NR3(i) making an uproar for time slot III relay node, i-th of subchannel is indicated
Acoustical signal.
The reception signal of IV destination node of time slot is：
Respectively wherein, YD4(i) the reception signal of time slot IV destination node, i-th of subchannel is indicated；Indicate time slot IV
The transmission signal of i-th of subchannel of source node；Indicate the transmission signal of time slot II relay node, i-th of subchannel；ND4
(i) noise signal of time slot IV destination node, i-th of subchannel is indicated.
Wherein ND3、NR3And ND4It is noise sequence, it is 0 to meet mean value, variance N0Multiple Gauss distribution.
The reception signal of all time slots is subjected to maximum-ratio combing, detects to send signal S1And S2.Due to time slot I and III
It is to direct transfer, time slot II and IV is sent using Space Time Coding, and therefore, final signal-to-noise ratio can be expressed as：
γtotal=γdirect+γalamouti (7)
Wherein, γdirectExpression direct transfers signal-to-noise ratio, γalamoutiIndicate Space Time Coding signal-to-noise ratio, γtotalIndicate final letter
It makes an uproar ratio.
When relay node can be properly received the signal of source node, the reception signal Y in formula (1), (3), (4) and (6)D1
(i)、YD2(i)、YD3(i)、YD4(i) maximum-ratio combing is carried out, is obtained：
Wherein,Signal S is indicated respectively2And S1Maximum-ratio combing；Respectively
To receive signal YD3(i)、YD4(i) complex conjugate.Wherein：
Wherein, wij(i=1,2, j=1,2,3) indicates the weighting coefficient of each branch when maximum-ratio combing；Point
It Wei not HSD、HRDComplex conjugate.
Total signal-to-noise ratio after all merging is：
When relay node cannot be properly received the signal of source node S, relaying cannot participate in forwarding, the letter received at this time
Make an uproar than for：
Step 103：The power allocation factor of subcarrier is determined according to the signal-to-noise ratio end to end.
Assuming that the transmission power of system is limited, the total emission power of source node S and relay node R are P1+P2=P, P1=α
P, then P2=(1- α) P.Wherein α is the power allocation factor of source node.
Due to being modulated using OFDM, the transient channel of each subcarrier differs greatly, when S and R knows that instantaneous channel declines
When subtracting parameter, the transmission power of each subcarrier can be allocated.Assuming that N number of subcarrier carries out data transmission, saved with source
For point S, total transmission power of an OFDM symbol is Ptotle,S=NP1, i.e., the average transmitting power of each subcarrier is
P1.It is β to enable the power allocation factor of i-th of subcarrieri, the transmission power P of i-th of subcarrier1i=βiP1, wherein i=1,
2 ..., N can then be obtained
By taking i-th of carrier wave as an example, because wherein relay node R can carry out CRC error detection, therefore, the letter of single carrier wave
Relaying R number can be correctly passed to, can not be forwarded, only there are one all sub-carrier signals in OFDM symbol correctly to pass
It is defeated, this symbol can be forwarded.So we need consider the signal-to-noise ratio to direct transfer and the signal-to-noise ratio to cooperate it
Between relationship.The signal-to-noise ratio to direct transfer is：
γdirect=2 βdirect,iγ|HSD(i)|2 (13)
Wherein γ indicates total signal-to-noise ratio；βdirect,iIt is the power distribution for i-th of subcarrier that source node S is sent when direct transferring
The factor.
The signal-to-noise ratio of cooperation is：
Wherein βco,iWhen being cooperation, the power allocation factor for i-th of subcarrier that source node S is sent；It is relay node R
The power allocation factor of i-th of the subcarrier sent.
For βdirect,i, it is desirable that the poor subcarrier of channel distributes relatively high power, otherwise distributes smaller power.It therefore can
With：
Similarly for cooperation state, first has to meet source node S and can correctly be transmitted to relay node R, therefore：
At this timeRemaining power is：
Step 104：The hair of each subcarrier in the space time collaboration system model is distributed according to the power allocation factor
Send power.Specially：
According to power allocation factor βdirect,iThe power for i-th of subcarrier that source node is sent when distribution direct transfers；
According to power allocation factor βco,iThe power for i-th of subcarrier that source node is sent when distribution cooperation；
According to power allocation factorDistribute the power for i-th of subcarrier that relay node is sent.
As it can be seen that in order to improve the performance of traditional double-direction radio relay system, power distribution method provided by the invention uses
Decoding-forwarding (DF) agreement has studied the power allocation scheme of the space time collaboration system based on OFDM, is based on instantaneous channel state
Information proposes a kind of power distribution method, has built the system model of space time collaboration first, and each node is provided with single antenna, section
It is communicated using semiduplex mode between point, the OFDM modulation that source node and relay node are all made of N is transmitted, and is relayed
The forwarding of node uses DF agreements, and introduces the wrong propagated forward probability of CRC check reduction；Relay time slot source node and relaying
The transmission of node uses Alamouti Space Time Coding, and reduces the bit error rate using maximum-ratio combing technology；Then it analyzes
Between Signal To Noise Ratio end to end has derived the outage probability of system in the case where the transmission power of system is limited, and also right
Power distribution under known instantaneous channel state information is analyzed, and provides allocation plan, is obtained in more preferably system
Disconnected performance.
A kind of power distribution method based on instantaneous channel state information provided by the invention is verified below by emulation
Validity.In emulation assume relaying R and receiving node D from it is closer, with source node S from must relatively a little further, i.e. δ2 SR=3,
δ2 SD=1 and δ2 RD=10, use N=128 sub- carrier OFDM modulations.Wherein δ2 SR、δ2 SDAnd δ2 RDIndicate that source node arrives respectively
The distance of relay node, source node to destination node, relay node to destination node, subscript 2 indicate path loss index.
Fig. 5 is the graph of relation between the signal-to-noise ratio and outage probability provided by the invention for emulating and obtaining, and abscissa is
Signal-to-noise ratio, ordinate indicate outage probability.Fig. 5 gives under two kinds of channel status, under optimal and average power allocation factor
The curve of system performance and signal-to-noise ratio.By curve as can be seen that the performance of optimal power is better than average power allocation, also want
Better than the system break performance under other power distributions, the upper bound of theory deduction is similar with the curved line relation of actual emulation.When
Signal-to-noise ratio is a boundary when being equal to 10dB, and when more than this boundary, the performance under average power allocation will be less than optimal work(
Performance about 2dB under rate distribution.From figure 5 it can be seen that the present invention is based under the power distribution of instantaneous channel state information
System performance is obviously better than the system performance under statistical channel state.When outage probability is 10-3When, instantaneous channel state information
Under power distribution system performance to improve about 9dB.Statistics is compared with instantaneous channel state, to the requirement of system under transient state
Height needs Real-time Feedback so that complexity is got higher, i.e., instantaneous channel state information is to exchange the biography of system for lot of complexity
Defeated performance.
Fig. 6 is a kind of structure chart of the power distribution system based on instantaneous channel state information provided by the invention.Such as Fig. 6
Shown, the present invention also provides a kind of power distribution system based on instantaneous channel state information, the power distribution system includes：
System model establishes module 601, for establishing space time collaboration system model；The space time collaboration system model includes
Source node, relay node and destination node；
Signal-to-noise ratio acquisition module 602, for obtaining signal-to-noise ratio end to end according to the space time collaboration system model；It is described
Signal-to-noise ratio includes direct transfer signal-to-noise ratio and cooperation signal-to-noise ratio end to end；
Power allocation factor determining module 603, for signal-to-noise ratio to determine the power point of subcarrier end to end according to
With the factor；
Power distribution module 604, it is every in the space time collaboration system model for being distributed according to the power allocation factor
The transmission power of a subcarrier.
Wherein, the system model is established module 601 and is specifically included：
System model establishes unit, for establishing the space time collaboration system model；The space time collaboration system model packet
Include source node, relay node and destination node；Each node in the space time collaboration system model is provided with single antenna, node
Between communicated using semiduplex mode；The OFDM modulation that the source node and the destination node are all made of N is passed
It is defeated；
The frequency domain channel of wherein source node to relay node is HSR={ HSR(1),HSR(2),...,HSR(N)}；Wherein HSR
(i), i-th subchannel of the i=1,2...N expression source nodes to relay node；
The frequency domain channel of wherein relay node to destination node is HRD={ HRD(1),HRD(2),...,HRD(N)}；Wherein
HRD(i), i-th subchannel of the i=1,2...N expression relay nodes to destination node；
The frequency domain channel of wherein source node to destination node is HSD={ HSD(1),HSD(2),...,HSD(N)}；Wherein HSD
(i), i-th subchannel of the i=1,2...N expression source nodes to destination node.
The signal-to-noise ratio acquisition module 602 specifically includes：
Direct transfer signal-to-noise ratio determination unit, for according to formula γdirect=2 βdirect,iγ|HSD(i)|2It direct transfers described in determination
Signal-to-noise ratio；Wherein γdirectExpression direct transfers signal-to-noise ratio, βdirect,iThe power point for i-th of subcarrier that source node is sent when to direct transfer
With the factor；γ is total signal-to-noise ratio；HSD(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；
Cooperate signal-to-noise ratio determination unit, for according to formula
Determine the cooperation signal-to-noise ratio；Wherein γcoIndicate cooperation signal-to-noise ratio；βco,iI-th of subcarrier that source node is sent when to cooperate
Power allocation factor；α is the power allocation factor of source node；HSD(i), i=1,2...N indicates that source node arrives destination node
I-th of subchannel；It is the power allocation factor for i-th of subcarrier that relay node is sent；HRD(i), i=1,2...N is indicated
I-th subchannel of the relay node to destination node.
The power allocation factor determining module 603 specifically includes：
Direct transfer power allocation factor determination unit, for according to formulaSource when determination direct transfers
The power allocation factor for i-th of subcarrier that node is sent；
Collaboration power distribution factor determination unit, for according to formulaSource when determining cooperation
The power allocation factor for i-th of subcarrier that node is sent；
Relay node power allocation factor determination unit, for according to formulaDetermine relaying section
The power allocation factor for i-th of subcarrier that point is sent.
The power distribution module 604, specifically includes：
Direct transfer power distributing unit, for according to power allocation factor βdirect,iSource node is sent when distribution direct transfers i-th
The power of a subcarrier；
Collaboration power allocation unit, for according to power allocation factor βco,iSource node is sent when distribution cooperation i-th
The power of subcarrier；
Relay power allocation unit, for according to power allocation factorDistribute i-th of subcarrier that relay node is sent
Power.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
Specific examples are used herein to describe the principles and implementation manners of the present invention, the explanation of above example
The method and its core concept of the present invention are merely used to help understand, described embodiment is only that the part of the present invention is real
Example is applied, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of the every other embodiment that is obtained, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of power distribution method based on instantaneous channel state information, which is characterized in that the power distribution method includes：
Establish space time collaboration system model；The space time collaboration system model includes source node, relay node and destination node；
Signal-to-noise ratio end to end is obtained according to the space time collaboration system model；The signal-to-noise ratio end to end includes the noise that direct transfers
Than and cooperation signal-to-noise ratio；
The power allocation factor of subcarrier is determined according to the signal-to-noise ratio end to end；
The transmission power of each subcarrier in the space time collaboration system model is distributed according to the power allocation factor.
2. power distribution method according to claim 1, which is characterized in that described to establish space time collaboration system model, tool
Body includes：
Establish the space time collaboration system model；The space time collaboration system model includes source node, relay node and purpose section
Point；Each node in the space time collaboration system model is provided with single antenna, is led to using semiduplex mode between node
Letter；The OFDM modulation that the source node and the destination node are all made of N is transmitted；
The frequency domain channel of wherein source node to relay node is HSR={ HSR(1),HSR(2),...,HSR(N)}；Wherein HSR(i),i
=1,2...N indicates source node to i-th of subchannel of relay node；
The frequency domain channel of wherein relay node to destination node is HRD={ HRD(1),HRD(2),...,HRD(N)}；Wherein HRD(i),
I=1,2...N indicates relay node to i-th of subchannel of destination node；
The frequency domain channel of wherein source node to destination node is HSD={ HSD(1),HSD(2),...,HSD(N)}；Wherein HSD(i),i
=1,2...N indicates source node to i-th of subchannel of destination node.
3. power distribution method according to claim 2, which is characterized in that described according to the space time collaboration system model
Signal-to-noise ratio end to end is obtained, is specifically included：
According to formula γdirect=2 βdirect,iγ|HSD(i)|2Direct transfer signal-to-noise ratio described in determination；Wherein γdirectExpression direct transfers letter
It makes an uproar and compares, βdirect,iThe power allocation factor for i-th of subcarrier that source node is sent when to direct transfer；γ is total signal-to-noise ratio；HSD(i),
I=1,2...N indicates source node to i-th of subchannel of destination node；
According to formulaDetermine the cooperation signal-to-noise ratio；Its
Middle γcoIndicate cooperation signal-to-noise ratio；βco,iThe power allocation factor for i-th of subcarrier that source node is sent when to cooperate；α saves for source
Point power allocation factor；HSD(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；It is relaying section
The power allocation factor for i-th of subcarrier that point is sent；HRD(i), i=1,2...N indicates relay node to the i-th of destination node
Sub-channels.
4. power distribution method according to claim 3, which is characterized in that signal-to-noise ratio is true end to end described in the basis
The power allocation factor of subcarrier, specifically includes：
According to formulaDetermine the power distribution of i-th of subcarrier that source node is sent when direct transferring because
Son；
According to formulaDetermine cooperation when source node send i-th of subcarrier power distribution because
Son；
According to formulaDetermine the power allocation factor for i-th of subcarrier that relay node is sent.
5. power distribution method according to claim 4, which is characterized in that described to be distributed according to the power allocation factor
The transmission power of each subcarrier, specifically includes in the space time collaboration system model：
According to power allocation factor βdirect,iThe power for i-th of subcarrier that source node is sent when distribution direct transfers；
According to power allocation factor βco,iThe power for i-th of subcarrier that source node is sent when distribution cooperation；
According to power allocation factorDistribute the power for i-th of subcarrier that relay node is sent.
6. a kind of power distribution system based on instantaneous channel state information, which is characterized in that the power distribution system includes：
System model establishes module, for establishing space time collaboration system model；The space time collaboration system model include source node,
Relay node and destination node；
Signal-to-noise ratio acquisition module, for obtaining signal-to-noise ratio end to end according to the space time collaboration system model；It is described end-to-end
Signal-to-noise ratio include direct transfer signal-to-noise ratio and cooperation signal-to-noise ratio；
Power allocation factor determining module, for signal-to-noise ratio to determine the power allocation factor of subcarrier end to end according to；
Power distribution module, for distributing each subcarrier in the space time collaboration system model according to the power allocation factor
Transmission power.
7. power distribution system according to claim 6, which is characterized in that the system model is established module and specifically wrapped
It includes：
System model establishes unit, for establishing the space time collaboration system model；The space time collaboration system model includes source
Node, relay node and destination node；Each node in the space time collaboration system model is provided with single antenna, is adopted between node
It is communicated with semiduplex mode；The OFDM modulation that the source node and the destination node are all made of N is transmitted；
The frequency domain channel of wherein source node to relay node is HSR={ HSR(1),HSR(2),...,HSR(N)}；Wherein HSR(i),i
=1,2...N indicates source node to i-th of subchannel of relay node；
The frequency domain channel of wherein relay node to destination node is HRD={ HRD(1),HRD(2),...,HRD(N)}；Wherein HRD(i),
I=1,2...N indicates relay node to i-th of subchannel of destination node；
The frequency domain channel of wherein source node to destination node is HSD={ HSD(1),HSD(2),...,HSD(N)}；Wherein HSD(i),i
=1,2...N indicates source node to i-th of subchannel of destination node.
8. power distribution system according to claim 7, which is characterized in that the signal-to-noise ratio acquisition module specifically includes：
Direct transfer signal-to-noise ratio determination unit, for according to formula γdirect=2 βdirect,iγ|HSD(i)|2Direct transfer noise described in determination
Than；Wherein γdirectExpression direct transfers signal-to-noise ratio, βdirect,iWhen to direct transfer source node send i-th of subcarrier power distribution because
Son；γ is total signal-to-noise ratio；HSD(i), i-th subchannel of the i=1,2...N expression source nodes to destination node；
Cooperate signal-to-noise ratio determination unit, for according to formula
Determine the cooperation signal-to-noise ratio；Wherein γcoIndicate cooperation signal-to-noise ratio；βco,iI-th of subcarrier that source node is sent when to cooperate
Power allocation factor；α is source node power allocation factor；HSD(i), i=1,2...N indicates source node to the of destination node
I sub-channels；It is the power allocation factor for i-th of subcarrier that relay node is sent；HRD(i), during i=1,2...N is indicated
After i-th of subchannel of node to destination node.
9. power distribution system according to claim 8, which is characterized in that the power allocation factor determining module is specific
Including：
Direct transfer power allocation factor determination unit, for according to formulaSource node when determination direct transfers
The power allocation factor of i-th of the subcarrier sent；
Collaboration power distribution factor determination unit, for according to formulaSource node is sent out when determining cooperation
The power allocation factor of i-th of the subcarrier sent；
Relay node power allocation factor determination unit, for according to formulaDetermine that relay node is sent
I-th of subcarrier power allocation factor.
10. power distribution system according to claim 9, which is characterized in that the power distribution module specifically includes：
Direct transfer power distributing unit, for according to power allocation factor βdirect,iI-th of son that source node is sent when distribution direct transfers
The power of carrier wave；
Collaboration power allocation unit, for according to power allocation factor βco,iI-th of subcarrier that source node is sent when distribution cooperation
Power；
Relay power allocation unit, for according to power allocation factorDistribute the work(for i-th of subcarrier that relay node is sent
Rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810415810.1A CN108768479B (en) | 2018-05-03 | 2018-05-03 | Power distribution method and system based on instantaneous channel state information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810415810.1A CN108768479B (en) | 2018-05-03 | 2018-05-03 | Power distribution method and system based on instantaneous channel state information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108768479A true CN108768479A (en) | 2018-11-06 |
| CN108768479B CN108768479B (en) | 2020-12-11 |
Family
ID=64009705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810415810.1A Active CN108768479B (en) | 2018-05-03 | 2018-05-03 | Power distribution method and system based on instantaneous channel state information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108768479B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242368A (en) * | 2008-03-05 | 2008-08-13 | 中科院嘉兴中心微系统所分中心 | Power distribution system and method in wireless sensor network based on collaborative transmission |
| CN102333367A (en) * | 2011-10-25 | 2012-01-25 | 上海大学 | Transmission power allocation method for cooperative communication system |
| CN102780670A (en) * | 2012-06-29 | 2012-11-14 | 安徽大学 | Full-rate multi-hop wireless collaboration relay transmission scheme |
| CN105812111A (en) * | 2016-03-03 | 2016-07-27 | 电子科技大学 | Optimal power distribution method for SM-OFDM system under imperfect channel estimation |
| US9661579B1 (en) * | 2013-05-03 | 2017-05-23 | Marvell International Ltd. | Per-tone power control in OFDM |
| CN107819738A (en) * | 2017-09-22 | 2018-03-20 | 北京邮电大学 | Safety of physical layer control method based on power distribution in full duplex relaying system |
-
2018
- 2018-05-03 CN CN201810415810.1A patent/CN108768479B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242368A (en) * | 2008-03-05 | 2008-08-13 | 中科院嘉兴中心微系统所分中心 | Power distribution system and method in wireless sensor network based on collaborative transmission |
| CN102333367A (en) * | 2011-10-25 | 2012-01-25 | 上海大学 | Transmission power allocation method for cooperative communication system |
| CN102780670A (en) * | 2012-06-29 | 2012-11-14 | 安徽大学 | Full-rate multi-hop wireless collaboration relay transmission scheme |
| US9661579B1 (en) * | 2013-05-03 | 2017-05-23 | Marvell International Ltd. | Per-tone power control in OFDM |
| CN105812111A (en) * | 2016-03-03 | 2016-07-27 | 电子科技大学 | Optimal power distribution method for SM-OFDM system under imperfect channel estimation |
| CN107819738A (en) * | 2017-09-22 | 2018-03-20 | 北京邮电大学 | Safety of physical layer control method based on power distribution in full duplex relaying system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108768479B (en) | 2020-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Cui et al. | Distributed space–time coding for two-way wireless relay networks | |
| CN101399583B (en) | Collaboration partner selection and pre-coding collaboration communication method in cellular communication system | |
| US8396153B1 (en) | Cooperative MIMO in multicell wireless networks | |
| Yu et al. | Cooperative ARQ in wireless networks: Protocols description and performance analysis | |
| Can et al. | Hybrid forwarding scheme for cooperative relaying in OFDM based networks | |
| Ding et al. | Amplify-and-forward cooperative OFDM with multiple-relays: performance analysis and relay selection methods | |
| US9020056B2 (en) | Transmission scheme for multiple-input communication | |
| CN101383682B (en) | Collaborative diversity method based on constellation rotation quasi-orthogonal space time block code | |
| CN101237306A (en) | Broadband wireless sensor network transmission scheme based on collaborative communication of amplification forward single node | |
| Can et al. | Implementation issues for OFDM-based multihop cellular networks | |
| WO2010093332A1 (en) | A method of communication | |
| CN106533514B (en) | The working method of collaboration space modulating system based on IHDAF | |
| Yılmaz et al. | Performances of transmit antenna selection, receive antenna selection, and maximal-ratio-combining-based hybrid techniques in the presence of feedback errors | |
| Tajer et al. | Opportunistic cooperation via relay selection with minimal information exchange | |
| CN112954619A (en) | Communication method of LoRa multi-relay cooperative communication system based on amplification forwarding | |
| KR20070034408A (en) | Hybrid Forwarding Apparatus and Method for Cooperative Relaying in Orthogonal Frequency Multiplexing Network | |
| CN102098263A (en) | Low-detection complexity full-rate wireless cooperative relay transmission scheme | |
| CN101667893A (en) | Virtual multi-input multi-output relay transmission method based on space-time block coding | |
| CN101394259B (en) | Space time collaboration diversity method in OFDMA system | |
| CN108494466A (en) | The full duplex relaying transmission method that reconstruct is offset is interfered based on loop | |
| Wang et al. | Differential distributed space-time modulation for cooperative networks | |
| Kim et al. | OFDM channel estimation for the amply-and-forward cooperative channel | |
| CN106789823B (en) | Asynchronous relay cooperative transmission method based on space-time code | |
| CN108768479A (en) | A kind of power distribution method and system based on instantaneous channel state information | |
| Niu et al. | Coded cooperation in OFDMA systems |
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 | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220325 Address after: 215400 Room 201, building 3, phase II, Taicang science and Technology Information Industrial Park, No. 27, Zigang Road, science and education new town, Taicang City, Suzhou City, Jiangsu Province Patentee after: Jiangsu jiezeluo Communication Technology Co.,Ltd. Address before: 226000 No.9, Siyuan Road, Langshan street, Chongchuan District, Nantong City, Jiangsu Province Patentee before: NANTONG University |