CN104902574B - A kind of day line options and power distribution method based on efficiency - Google Patents
A kind of day line options and power distribution method based on efficiency Download PDFInfo
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- CN104902574B CN104902574B CN201510167300.3A CN201510167300A CN104902574B CN 104902574 B CN104902574 B CN 104902574B CN 201510167300 A CN201510167300 A CN 201510167300A CN 104902574 B CN104902574 B CN 104902574B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a kind of day line options and power distribution method based on efficiency, the method includes：Step S1) obtain the channel state information that each mobile terminal is sent；Step S2) according to channel state information, the channel condition of all transmission antennas is ranked up according to quality, N before selectingttA transmission antenna forms transmission antenna collection；Calculate the efficiency optimal value of all transmission antenna combinations in transmission antenna collection, corresponding antenna combination is；N before reselectiontt+ 1 transmission antenna forms transmission antenna collection, calculatesIf, thenIt is combined for optimal antenna, otherwise, enables Ntt=Ntt+ 1, it repeats the above process, until the antenna that transmission antenna is concentrated is all transmission antennas；Step S3) transmission power distribution is carried out by the way of secondary distribution to the transmission antenna in optimal antenna combination.The method of the present invention effectively prevents the energy surplus of mobile terminal, realizes maximally utilizing for whole system energy, and computational complexity is greatly lowered entire method compared with the conventional method.
Description
Technical field
The present invention relates to the wireless resource management fields in distributed mobile communication system, and in particular to one kind being based on efficiency
Day line options and power distribution method.
Background technology
With the lasting rising of energy demand and energy cost, how the continuous exacerbation of environmental problem improves communication network
Energy efficiency, realize green communications by extensive research and discuss.Core of the base station as centralized antenna system, in order to
It realizes the reliable communication with edge customer, ensures whole coverings of user, need to consume a large amount of energy.In order to by the hair of base station
Antennas is with user as close as raising energy utilization rate connects what the antenna element being geographically separated formed by optical fiber
Distributing antenna system comes into being；It can not only reduce access distance, reduce transmission energy, moreover it is possible to increase power system capacity,
Expand the network coverage, improve marginal user performance, obtains extensive concern in use.
In distributing antenna system, rational resource allocation can further improve system performance, improve power efficiency.
In terms of day line options and power distribution, at present most methods be the channel state information (CSI) that is obtained according to transmitting terminal into
Row power water filling obtains optimal power assignment value, by judging that the numerical value of distribution power selects antenna.But these methods
Energy valid value is always less than the energy valid value that method is lifted by group, and the combinatorial search of day line options and power distribution needs repeatedly change repeatedly
In generation, just can determine that optimum combination.When the spaced antenna in distributing antenna system is more, combinatorial search scheme is because of its complexity
Height is spent, additional circuit energy consumption is will produce, offsets the transmission energy that it is saved, also, complexity is too high can also increase sound
Between seasonable, online user's demand cannot be satisfied.
Invention content
It is an object of the invention to overcome day line options in current distributing antenna system and power distribution method to deposit
Drawbacks described above, it is proposed that a kind of day line options and power distribution method based on efficiency, this method can be in efficiency and fortune
Reach balanced between calculation complexity, while obtaining high energy efficiency, the computational complexity of system is greatly lowered.
To achieve the goals above, the present invention provides a kind of day line options and power distribution method based on efficiency, institute
The method of stating includes the following steps：
Step S1) channel state information that each mobile terminal is sent is obtained, the channel state information includes sending day
The large-scale decline information and channel noise variance of line；
The transmission antenna is the antenna of transmitting terminal, number Nt；The transmitting terminal is the base in distributing antenna system
The distributed antenna unit stood and be connected with base station；
Step S2) according to channel state information, the channel condition of all transmission antennas is ranked up according to quality, is selected
Preceding NttA transmission antenna forms transmission antenna collection；Under conditions of each antenna transmission power is equal, calculate in transmission antenna collection
The efficiency optimal value of all transmission antenna combinationsIts corresponding antenna combination isN before reselectiontt+ 1 transmission antenna
Transmission antenna collection is formed, is calculatedIfThenIt is combined for optimal antenna, is transferred to step 3)；Otherwise, then
N before selectiontt+ 2 transmission antennas form transmission antenna collection, calculateIt repeats the above process, until of transmission antenna collection
Number is equal to Nt；
Step S3) transmission power distribution is carried out by the way of secondary distribution to the transmission antenna in optimal antenna combination,
In first time power distribution, the enclosed power solution of first transmission antenna, other transmissions are obtained by Lagrangian constant method
The performance number of antenna is calculated according to the ratio of respective channels coefficient；In second of power distribution, mobile terminal is utilized
Bit error rate requirement adjusts the performance number of transmission antenna, keeps the signal strength of mobile terminal minimum within the scope of bit error rate requirement.
In above-mentioned technical proposal, the step S2) it specifically includes：
Step S201) according to mobile terminal bit error rate requirement and transmission antenna between channel state information distribution situation,
Determine the initial ranging number N of transmission antennatt, wherein Ntt< Nt；
Step S202) channel condition of all transmission antennas is ranked up according to quality, N before selectingttA transmission antenna
Transmission antenna collection is formed, the efficiency optimal value of all transmission antenna combinations in transmission antenna collection is calculatedIts corresponding antenna sets
It is combined into
Each transmission antenna combines corresponding efficiency ηEEIt is expressed as：
Wherein, si∈ 0,1, i=1...NttIndicate the selection situation of each transmission antenna in transmission antenna combination, 0 table
Show it is non-selected, 1 indicate selected；pi, hiThe performance number and large-scale decline for indicating i-th transmission antenna respectively, enable pi=pmax,
Wherein pmaxFor the maximum transmission power of every antenna；pCIt is the circuit power consumption of transmission antenna；It is channel noise variance；P, s points
It is not that power allocation vector and day line options are vectorial, R p, s, ptotP, s indicate single
Momentary output and power consumption in the bandwidth of position；
Step S203) channel condition of all transmission antennas is ranked up according to quality, N before selectingtt+ 1 transmission day
Line forms transmission antenna collection, calculates the efficiency optimal value of all transmission antenna combinations in transmission antenna collectionIts corresponding day
Line is combined as
Step S204) judgeIt is whether true, if a determination be made that certainly, best antenna combination
ForIt is transferred to step S206)；Otherwise, it is transferred to step 205)；
Step S205) judge Ntt+ 1=NtIt is whether true, if a determination be made that certainly, best antenna combination isIt is transferred to step S206), otherwise, enable Ntt=Ntt+ 1, it is transferred to step S203)；
Step S206) obtain the optimal combination s of transmission antenna*, antenna selection procedure terminates.
In above-mentioned technical proposal, the step S3) it specifically includes：
Step S301) first time transmission power distribution is carried out to the transmission antenna in optimal antenna combination：It is bright by glug
Day, constant method obtained the enclosed power solution of first transmission antenna, and the performance number of other transmission antennas is according to respective channels coefficient
Ratio is calculated；
Step S302) utilize step S301) in obtained antenna power value, estimate the signal strength γ of mobile terminal1：
Step S303) calculate γ1With the lowest signal intensity γ needed for mobile terminal0Ratio γp；
Step S304) with γpFor zooming parameter, the performance number of transmission antenna is adjusted, obtains the best hair of each antenna
Send power：
In above-mentioned technical proposal, the step S301) be specially：
Limitation based on transmitting terminal and mobile terminal to antenna power, efficiency ηEEMaximization problems be expressed as：
S.t.0 < pi≤pmax,1≤i≤Nopt (2)
Wherein, NoptIt is optimal combination s*In antenna number, γ0It is the lowest signal-to-noise requirement of mobile terminal, according to shifting
The lowest bit error rate of terminal is moved to calculate；
For above-mentioned optimization problem, the transmission power p of first transmission antenna is obtained using Lagrangian constant method1：
Wherein, exp (x) is exponential function, and w (x) is the inverse function of function xexp x；
The power p of remaining transmission antennaiFor：
The advantage of the invention is that：
1, in terms of antenna selection, the impaction of partial channel state information that method of the invention is fed back according to mobile terminal will be sent out
The group of antennas lifts the antenna combination search that search is converted to a small range, can realize and obtain efficiency with smaller iterations
The antenna combination of optimal value, simplifies search process, and the computational complexity of system is greatly lowered；
2, in terms of power distribution, method of the invention simplifies assigning process by the way of secondary distribution, wherein
In a power distribution, after obtaining the enclosed power solution of first antenna by using Lagrangian constant method, other antennas
Performance number directly zoomed in and out according to the ratio of respective channels coefficient；In secondary power distribution, by using mobile terminal
Bit error rate requirement, adjust the performance number of transmission antenna so that the signal strength of mobile terminal is in the claimed range of the bit error rate
It is as low as possible, the energy surplus of mobile terminal is effectively avoided, maximally utilizing for system capacity is realized；
3, method proposed by the present invention is in the case where meeting requirement of the multiple antennas mobile communication system to computational complexity, effectively
The energy surplus for avoiding mobile terminal, the efficiency for realizing system maximize.
Description of the drawings
Fig. 1 is the communication scheme of distributing antenna system；
Fig. 2 is the flow chart of the day line options and power distribution method based on efficiency of the present invention；
Fig. 3 is the antenna selection procedure schematic diagram in the method for the present invention；
Fig. 4 is the power allocation procedure schematic diagram in the method for the present invention.
Attached drawing identifies：
10, distributing antenna system 102, base station 103, distributed antenna unit
104, mobile terminal
Specific implementation mode
As shown in Figure 1, distributing antenna system 10 includes：Base station 102, distributed antenna unit 103 and mobile terminal
104；The number of the base station 102 is 1, the centralized processing for completing data, and the base station 102 includes 4 antennas, but base station
102 are not limited to include 4 antennas；The number of the distributed antenna unit 103 is 4, but is not limited to 4, each distribution
Formula antenna element 103 has 1 antenna, but is not limited to only 1 antenna；The number of the mobile terminal 104 is 3, but not
3 are confined to, the mobile terminal 104 has 1 antenna, but is not limited to only 1 antenna.
The distributed antenna unit 103 is distributed in cell edge, is connected with base station 102 by the broadband optical fiber of high speed,
The transmitting terminal of system is collectively formed, transmission antenna is the antenna of the transmitting terminal, number Nt=8.It is right by the base station 102
Distributed antenna unit 103 is uniformly controlled, and the collaboration communication of base station and distributed antenna unit may be implemented, and is completed to moving
The combined transceiving processing of dynamic terminal.
The present invention is described in detail below in conjunction with the accompanying drawings.
As shown in Fig. 2, a kind of day line options and power distribution method based on efficiency, specifically include following steps：
Step S1) channel state information that each mobile terminal is sent is obtained, the channel state information includes sending day
The large-scale decline information and channel noise variance of line；
Step S2) according to channel state information, the channel condition of all transmission antennas is ranked up according to quality, is selected
Preceding NttA transmission antenna forms transmission antenna collection；Under conditions of each antenna transmission power is equal, calculate in transmission antenna collection
The efficiency optimal value of all transmission antenna combinationsIts corresponding antenna combination isN before reselectiontt+ 1 transmission antenna
Transmission antenna collection is formed, is calculatedIfThenIt is combined for optimal antenna, is transferred to step 3)；Otherwise, then
N before selectiontt+ 2 transmission antennas form transmission antenna collection, calculateIt repeats the above process, until of transmission antenna collection
Number is equal to Nt；
As shown in figure 3, the step S2) it specifically includes：
Step S201) according to mobile terminal bit error rate requirement and transmission antenna between channel state information distribution situation,
Determine the initial ranging number N of transmission antennatt, wherein Ntt< Nt；
Preferably, relatively low in the bit error rate requirement of mobile terminal and under conditions of readily satisfy, when the big ruler of transmission antenna
When degree fading ratio is more consistent, Ntt=4；When the large-scale decline gap of transmission antenna is larger, Ntt=2.
Step S202) channel condition of all transmission antennas is ranked up according to quality, N before selectingttA transmission antenna
Transmission antenna collection is formed, the efficiency optimal value of all transmission antenna combinations in transmission antenna collection is calculatedIts corresponding antenna sets
It is combined into
Each transmission antenna combines corresponding efficiency ηEEIt is expressed as：
Wherein, si∈ 0,1, i=1...NttIndicate the selection situation of each transmission antenna in transmission antenna combination, 0 table
Show it is non-selected, 1 indicate selected；pi, hiThe performance number and large-scale decline for indicating i-th transmission antenna respectively, in order to which simplification is searched
Rope process, enables pi=pmax, wherein pmaxFor the maximum transmission power of every antenna；pCIt is the circuit power consumption of transmission antenna；It is
Channel noise variance；P, s are that power allocation vector and day line options are vectorial respectively,R
P, s, ptotP, s indicate momentary output and power consumption on unit bandwidth.
Step S203) channel condition of all transmission antennas is ranked up according to quality, N before selectingtt+ 1 transmission day
Line forms transmission antenna collection, calculates the efficiency optimal value of all transmission antenna combinations in transmission antenna collectionIts corresponding day
Line is combined as
Step S204) judgeIt is whether true, if a determination be made that certainly, best antenna combination isIt is transferred to step S206)；Otherwise, it is transferred to step 205)；
Step S205) judge Ntt+ 1=NtIt is whether true, if a determination be made that certainly, best antenna combination isIt is transferred to step S206), otherwise, enable Ntt=Ntt+ 1, it is transferred to step S203)；
Step S206) obtain the optimal combination s of transmission antenna*, antenna selection procedure terminates.
Step S3) transmission power distribution is carried out to the transmission antenna in optimal antenna combination；
As shown in figure 4, the step S3) it specifically includes：
Step S301) first time transmission power distribution is carried out to the transmission antenna in optimal antenna combination；
Limitation based on transmitting terminal and mobile terminal to antenna power, efficiency ηEEMaximization problems can be expressed as：
S.t.0 < pi≤pmax,1≤i≤Nopt (2)
Wherein, NoptIt is optimal combination s*In transmission antenna number, γ0It is the lowest signal-to-noise requirement of mobile terminal, according to
It is calculated according to the lowest bit error rate of mobile terminal.
For above-mentioned optimization problem, the transmission power of first antenna can be obtained using Lagrangian constant method
p1,
Wherein, exp (x) is exponential function, and w (x) is the inverse function of function xexp x；
The power p of remaining transmission antennaiFor：
Step S302) utilize step S301) in obtained antenna power value, estimate the signal strength γ of mobile terminal1：
Step S303) calculate γ1With the lowest signal intensity γ needed for mobile terminal0Ratio γp；
Step S304) with γpFor zooming parameter, the performance number of transmission antenna is adjusted, obtains the best of each transmission antenna
Transmission power：
The basic principles and main features and advantages of the present invention of the present invention have been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (3)
1. a kind of day line options and power distribution method based on efficiency, the described method comprises the following steps：
Step S1) channel state information that each mobile terminal is sent is obtained, the channel state information includes transmission antenna
Large-scale decline information and channel noise variance；
The transmission antenna is the antenna of transmitting terminal, number Nt；The transmitting terminal be distributing antenna system in base station and with
The connected distributed antenna unit in base station；
Step S2) according to channel state information, the channel condition of all transmission antennas is ranked up according to quality, N before selectingtt
A transmission antenna forms transmission antenna collection；Under conditions of each antenna transmission power is equal, calculates in transmission antenna collection and own
The efficiency optimal value of transmission antenna combinationIts corresponding antenna combination isN before reselectiontt+ 1 transmission antenna composition
Transmission antenna collection calculatesIfThenIt is combined for optimal antenna, is transferred to step S3)；Otherwise, reselection
Preceding Ntt+ 2 transmission antennas form transmission antenna collection, calculateIt repeats the above process, until the number etc. of transmission antenna collection
In Nt；
Step S3) optimal antenna is combined in transmission antenna transmission power distribution is carried out by the way of secondary distribution, the
In power distribution, the enclosed power solution of first transmission antenna, other transmission antennas are obtained by Lagrangian constant method
Performance number be calculated according to the ratio of respective channels coefficient；In second of power distribution, the error code of mobile terminal is utilized
Rate requirement, adjusts the performance number of transmission antenna, keeps the signal strength of mobile terminal minimum within the scope of bit error rate requirement；
The step S3) it specifically includes：
Step S301) first time transmission power distribution is carried out to the transmission antenna in optimal antenna combination：By Lagrangian normal
Number methods obtain the enclosed power solution of first transmission antenna, the performance numbers of other transmission antennas according to respective channels coefficient ratio
It is calculated；
Step S302) utilize step S301) in obtained antenna power value, estimate the signal strength γ of mobile terminal1：
pi, hiThe performance number and large-scale decline of i-th transmission antenna are indicated respectively,It is channel noise variance；NoptIt is best
Antenna number in antenna combination；
Step S303) calculate γ1With the lowest signal intensity γ needed for mobile terminal0Ratio γp；
Step S304) with γpFor zooming parameter, the performance number of transmission antenna is adjusted, obtains the best transmission of each transmission antenna
Power：
2. day line options and power distribution method according to claim 1 based on efficiency, which is characterized in that the step
S2 it) specifically includes：
Step S201) according to the channel state information distribution situation between the bit error rate requirement and transmission antenna of mobile terminal, it determines
The initial ranging number N of transmission antennatt, wherein Ntt< Nt；
Step S202) channel condition of all transmission antennas is ranked up according to quality, N before selectingttA transmission antenna composition
Transmission antenna collection calculates the efficiency optimal value of all transmission antenna combinations in transmission antenna collectionIts corresponding antenna combination is
Each transmission antenna combines corresponding efficiency ηEEIt is expressed as：
Wherein, si∈ { 0,1 }, i=1 ... NttIndicate the selection situation of each transmission antenna in transmission antenna combination, 0 indicates not
Selection, 1 indicates to be selected；pi, hiThe performance number and large-scale decline for indicating i-th transmission antenna respectively, enable pi=pmax, wherein
pmaxFor the maximum transmission power of every antenna；pCIt is the circuit power consumption of transmission antenna；It is channel noise variance；P, s are respectively
Power allocation vector and day line options vector, R (p, s), ptot(p, s) indicates unit
Momentary output and power consumption in bandwidth；
Step S203) channel condition of all transmission antennas is ranked up according to quality, N before selectingtt+ 1 transmission antenna group
At transmission antenna collection, the efficiency optimal value of all transmission antenna combinations in transmission antenna collection is calculatedIts corresponding antenna sets
It is combined into
Step S204) judgeIt is whether true, if a determination be made that certainly, best antenna combination isIt is transferred to step S206)；Otherwise, it is transferred to step 205)；
Step S205) judge Ntt+ 1=NtIt is whether true, if a determination be made that certainly, best antenna combination isIt is transferred to step S206), otherwise, enable Ntt=Ntt+ 1, it is transferred to step S203)；
Step S206) obtain the optimal combination s of transmission antenna*, antenna selection procedure terminates.
3. day line options and power distribution method according to claim 1 based on efficiency, which is characterized in that the step
S301) it is specially：
Limitation based on transmitting terminal and mobile terminal to antenna power, efficiency ηEEMaximization problems be expressed as：
Wherein, NoptIt is optimal combination s*In antenna number, γ0It is the lowest signal-to-noise requirement of mobile terminal, according to mobile whole
The lowest bit error rate at end calculates；pmaxFor the maximum transmission power of every antenna；pCIt is the circuit power consumption of transmission antenna；
For above-mentioned optimization problem, the transmission power p of first transmission antenna is obtained using Lagrangian constant method1：
Wherein, exp (x) is exponential function, and ω (x) is the inverse function of function xexp (x)；
The power p of remaining transmission antennaiFor：
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10205491B2 (en) | 2015-09-28 | 2019-02-12 | Futurewei Technologies, Inc. | System and method for large scale multiple input multiple output communications |
| US20170093465A1 (en) * | 2015-09-28 | 2017-03-30 | Futurewei Technologies, Inc. | System and Method for Large Scale Multiple Input Multiple Output Communications |
| CN105827335B (en) * | 2016-06-07 | 2018-06-29 | 北京邮电大学 | A kind of antenna number determines method and device |
| CN107294571B (en) * | 2017-06-26 | 2020-11-13 | 维沃移动通信有限公司 | Data transmission method, base station and mobile terminal |
| CN112260737B (en) * | 2020-10-16 | 2021-09-10 | 东南大学 | Multi-beam satellite communication robust precoding method with total energy efficiency and minimum energy efficiency balanced |
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