CN109714093A - A kind of joint antenna selection method towards isomery cellular network - Google Patents
A kind of joint antenna selection method towards isomery cellular network Download PDFInfo
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- CN109714093A CN109714093A CN201811305256.8A CN201811305256A CN109714093A CN 109714093 A CN109714093 A CN 109714093A CN 201811305256 A CN201811305256 A CN 201811305256A CN 109714093 A CN109714093 A CN 109714093A
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Abstract
The invention discloses a kind of joint antenna selection methods towards isomery cellular network, suitable for the signal transmission under multiple antennas environment between base station and user, which comprises execute following steps for macro channel and small channel respectively: calculating based on the macro channel and small channel transmission rate in transmitting antenna to be selected access isomery cellular network；Combine the transmission rate of macro channel and small channel, and then obtains the system overall transmission rate of transmitting antenna pair to be selected；Select macro base station transmitting antenna to be selected and small Base Transmitter antenna corresponding to maximum system overall transmission rate as best macro cellulor transmitting antenna pair.Interference between base station and user is included in the overall target for measuring system performance by joint antenna selection scheme of the present invention, and applicable environment is more extensive；For the distribution situation of base station in isomery cellular network, it is assumed that transmission channel obeys Rayleigh fading between macro base station and macro user, and the transmission channel between small base station and small user obeys this decline of Lay, more tallies with the actual situation.
Description
Technical field
The present invention relates to a kind of joint antenna selection methods towards isomery cellular network, belong to wireless communication technique neck
Domain.
Background technique
With the explosive growth of wireless data traffic, only had been unable to meet by the conventional cellular network that isomorphism honeycomb forms
Business demand.Existing System Expansion method mainly passes through division cellular cell, disposes more cellular base stations, wireless being promoted
Network cost is also increased while power system capacity.Therefore, it is badly in need of designing a kind of low in cost, networking flexibility New honeycomb
The network architecture.For this purpose, passing through the wireless bee of isomery for disposing the lesser small base station composition of transmission power in macro base station coverage area
Nest network is got the attention, and is remarkably improved signal overburden depth, increases power system capacity, and improve transmission quality.
In addition, multi-antenna transmission can greatly improve spectrum efficiency, thus multiple antennas is introduced into isomery cellular network
In can further improve wireless system capacity.Currently used multi-antenna technology includes beam forming, Space Time Coding and day line selection
It selects.Beam forming technique improves the directionality of wireless signal transmission on the basis of increasing radio frequency link quantity, improves
Wireless transmission quality.Space-Time Codes can be such that channel capacity increases with number of antennas by using certain encoding and decoding algorithm
Add and increase, doubles up system spectrum utilization rate.However, although beam forming and space-time coding method can be effectively improved nothing
Line spectrum efficiency, but stringent synchronization between radio-frequency antenna is required, improve system cost and complexity.
Antenna Selection Technology comes into being as a result, according to certain selection criterion (for example, received signal to noise ratio maximal criterion,
Instantaneous channel capacity maximal criterion, reception bit error rate minimum criteria etc.), selected section antenna carries out information biography from all antennas
It is defeated, while guaranteeing multi-antenna transmission performance, the stationary problem between multiple antennas can be effectively relieved.Antenna selecting method both had
There is higher wireless frequency spectrum efficiency, while of less demanding to the synchronism of multiple antennas, reduces the implementation complexity of system.At present
Antenna Selection Technology applied to isomery cellular network is selected as representative with chance antenna, although isomery honeycomb is effectively promoted
The power system capacity of network, but the transmission channel of macrocellular and cellulor (hereinafter referred to as macro cellulor) inside is only accounted for, suddenly
The mutual interference channel between macro cellulor is omited.
Summary of the invention
The present invention is directed to propose a kind of joint antenna selection method that can be improved isomery cellular system overall transmission rate, both
Consider that the transmission rate of macro cellulor maximizes, minimizes the mutual interference between macro cellulor again.
To realize the above-mentioned technical purpose, the invention adopts the following technical scheme:
A kind of joint antenna selection method towards isomery cellular network is provided, is applied to use nothing between base station and user
The communication system of line transmission, characterized in that include one in macrocellular the system comprises a macrocellular and a cellulor
Macro base station and at least one macro user include that a small base station and at least one small user's macro base station and small base station are equal in cellulor
Dispose more antennas；
It the described method comprises the following steps:
In step A. macro base station and small base station in each transmitting antenna access isomery cellular network to be accessed, calculating receives at this time
The signal that the macro user and small user of signal receive；
Step B. is directed to macro channel respectively and small channel executes following steps:
It calculates based on the macro channel and small channel transmission rate in transmitting antenna to be selected access isomery cellular network；
Combine the transmission rate of macro channel and small channel, and then obtains the system overall transmission rate of transmitting antenna pair to be selected；
Step C. selects macro base station transmitting antenna to be selected and small Base Transmitter day corresponding to maximum system overall transmission rate
Line is as best macro cellulor transmitting antenna pair.
Further, the step A includes；
Macro user receives signalSignal is received with small userCalculation expression it is as follows:
i∈AM,j∈AS
Wherein macro base station M reaches purpose terminal m by i-th transmitting antenna to be selected and is denoted as macro channel MiM, channel response areSmall base station S reaches purpose terminal s by jth root transmitting antenna to be selected and is denoted as small channel SjS, channel response areIt is macro
Base station M is denoted as interference channel M to the small user s interference generated by i-th antenna to be selectediS, channel response areSmall base station
S is denoted as interference channel S to the macro user m interference generated by jth root antenna to be selectedjM, channel response arexMRepresent Hong Ji
It stands the transmission signal of M；xSIndicate the transmission signal of small base station S；AMRepresent the transmitting antenna set of macro base station, ASRepresent small base station
Transmitting antenna set, N0Indicate the noise power of transmitting terminal.
Further, the step B specific method includes:
The transmitting signal-to-noise ratio γ of macro base stationMWith the transmitting signal-to-noise ratio γ of small base stationSIt is denoted as respectively:
Wherein, PMIndicate the transmission power of macro base station, PSIndicate the transmission power of small base station；N0Indicate the noise of transmitting terminal
Power；
According to the reception signal y of macro userMimWith the reception signal of small userThe biography of macro small channel can be calculated
Defeated rate is as follows:
WhereinIndicate transmission rate of the macro base station M by the macro channel between transmitting antenna i to be selected to macro user m；Indicate that small base station S passes through the transmission rate of the small channel between transmitting antenna j to be selected to small user s；N indicates macro base station portion
The transmitting antenna sum of administration, M indicate the transmitting antenna sum of small base station deployment,
System overall transmission rate is equal to the sum of the transmission rate of macro small channel, and the expression of the system overall transmission rate is such as
Under:
Wherein RijExpression system overall transmission rate.
Further, remember XijAnd YijThe Signal to Interference plus Noise Ratio of respectively macro channel and small channel, as follows:
Therefore, system overall transmission rate formula (7) can simplify are as follows:
Further, in the step C, maximum system, which always transmits speed, to be determined to selection criterion using best transmitting antenna
The expression formula of rate, the maximum system overall transmission rate is as follows:
The corresponding best transmitting antenna of macro base stationWith the best transmitting antenna in small base stationIt is expressed as follows:
The present invention is compared with prior art:
1, the interference between base station and user is included in the overall target for measuring system performance by joint antenna selection scheme,
Scheme environment applicatory is more extensive.
2, for the distribution situation of base station in isomery cellular network, it is assumed that transmission channel is obeyed between macro base station and macro user
Rayleigh fading, the transmission channel between small base station and small user obey this decline of Lay, more tally with the actual situation；
3, the present invention can be not only used for selection transmitting antenna, can also be used to the antenna for selecting other function, applicable surface
It is wide.
Detailed description of the invention
Fig. 1 is specific embodiment of the invention system schematic；
Fig. 2 is the method flow diagram of the specific embodiment of the invention；
Fig. 3 is in the case where signal-to-noise ratio difference, and the system of searching loop, chance day line options and the method for the present invention always passes
Defeated rate simulating figure contrast schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings of the specification to this
Invention is described in more detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As depicted in figs. 1 and 2, the present invention devises a kind of joint antenna selection method towards isomery cellular network, different
Structure cellular network includes a macrocellular and a cellulor.
It is a special kind of skill to grow up on the basis of macrocellular that cellulor, which is also known as microcellulor (microcell),.With
Macrocellular is compared, its transmission power is smaller, generally in 2W or so；Covering radius is about 100m~1km；Macrocellular is covering
The farther away base station of range.
The specific embodiment of the method for the present invention is applied between base station and user using the communication system of wireless transmission,
The system comprises include a macrocell base stations (referred to as macro base in a macrocellular and a cellulor macrocellular
Stand) and at least one macrocell user (referred to as macro user), include in cellulor small cell base station (referred to as small base station) and
At least one cellulor user (referred to as small user).Remember that the transmission channel between macro base station and macro user is macro channel, small base station
Transmission channel between small user is small channel.More radio-frequency antennas are disposed in macro base station and small base station, and the two is all connected to
Core net.For optimization system overall transmission rate, according to the channel state information of macrocellular and cellulor, Combination selection goes out one
Macro base station transmitting antenna and one small Base Transmitter antenna, the best transmitting antenna proposed to selection scheme make macrocellular and
The system overall transmission rate of cellulor reaches maximum value, compared with existing chance antenna selecting method, significantly improves isomery
The system transmission performance of cellular network.
To calculate system overall transmission rate, first have to calculate the letter that user terminal receives after antenna to be selected accesses
Number, therefore execute step A.
Step A. is directed to each transmitting antenna to be accessed in macro base station and small base station (referred to as macro small base station) respectively, it is assumed that
It selects in transmitting antenna access isomery cellular network, obtains the letter that macro user at this time and small user (referred to as macro small user) receive
Number.
System uses spectrum sharing mechanisms, i.e. macrocellular and cellulor accesses identical frequency spectrum resource, to improve frequency spectrum benefit
Use efficiency.In order to more meet the actual conditions of wireless communication, in specific embodiment preferably, macro channel obeys Rayleigh fading, small
Channel obeys this decline of Lay.Wherein macro base station M reaches purpose terminal m by i-th transmitting antenna to be selected and is denoted as macro channel MiM,
Channel response isSmall base station S reaches purpose terminal s by jth root transmitting antenna to be selected and is denoted as small channel SjS, channel response
ForMacro base station M generates transmission interference to small user s by i-th antenna to be selected and is denoted as interference channel MiS, channel response areSmall base station S generates transmission interference to macro user m by jth root antenna to be selected and is denoted as interference channel SjM, channel response are
Obtain macro base station antenna M to be selectediWith small antenna for base station SjAfterwards, corresponding macro user receives signalWith small use
Family receives signalIt can be expressed as follows:
i∈AM,j∈AS
xMRepresent the transmission signal of macro base station M；xSIndicate the transmission signal of small base station S；AMRepresent the transmitting antenna of macro base station
Set；ASRepresent the transmitting antenna set of small base station.
Based on obtained receiving end signal, the transmission speed of macro channel and small channel after accessing antenna to be selected can be calculated
Rate to derive system overall transmission rate, therefore executes step B.
Step B. is directed to macro small channel respectively and executes following steps, based in transmitting antenna to be selected access isomery cellular network
Corresponding macro small user receives signal, obtains the corresponding macro small channel transmission rate of transmitting antenna to be selected respectively, and then obtain
System overall transmission rate；
The transmitting signal-to-noise ratio γ of macro base stationMWith the transmitting signal-to-noise ratio γ of small base stationSIt is denoted as respectively:
Wherein, PMIndicate the transmission power of macro base station M, PSIndicate the transmission power of small base station S；N0Indicate making an uproar for transmitting terminal
Acoustical power；
According to the reception signal of macro userWith the reception signal of small userMacro small channel can be calculated
Transmission rate is as follows:
WhereinIndicate transmission rate of the macro base station M by the macro channel between transmitting antenna i to be selected to macro user m；Indicate that small base station S passes through the transmission rate of the small channel between transmitting antenna j to be selected to small user s；N indicates macro base station portion
The transmitting antenna sum of administration, M indicate the transmitting antenna sum of small base station deployment.
In given isomery cellular network, system overall transmission rate is equal to the sum of the transmission rate of macro small channel, expression
It is as follows:
Wherein RijExpression system overall transmission rate remembers XijAnd YijThe Signal to Interference plus Noise Ratio of respectively macro channel and small channel, it is as follows
It is shown:
Therefore, system overall transmission rate can simplify are as follows:
According to system overall transmission rate has been derived, step C is executed.
Step C. determines maximum system overall transmission rate, the best transmitting day to selection criterion using best transmitting antenna
Line selects selection criterion macro base station transmitting antenna to be selected and small Base Transmitter day corresponding to maximum system overall transmission rate
Line is as best macro cellulor transmitting antenna pair.
The expression formula of maximum system overall transmission rate is as follows:
The corresponding best transmitting antenna of macro base stationWith the best transmitting antenna in small base stationIt is expressed as follows:
On the basis of the method for the present invention embodiments above, macro base station and small base station are utilized respectively best transmitting antenna
It is rightWithIt is wirelessly transferred with respective macro user and small user.
It is given below and realizes an example of the present invention using MATLAB Language Simulation on computers.It sets in simulations
Wireless channel independent same distribution, channel obeys Rayleigh fading in macrocellular, and channel obeys this decline of Lay in cellulor.Channel gainObeying mean value is 0, and variance isIndependent Gaussian distribution；Meeting mean value isExponential distribution.Channel gainObey the L-S distribution of this fading factor of Lay k=0.8.Respectively connect
It is 0 variance is N that the noise of receiving end, which is all mean value,0Stationary white Gaussian noise.Variable SNR (signal-to-noise ratio, unit dB) since 0,
Terminate to 20, step-length 1；Variable Gamma1、Gamma2, (Gamma2=β × Gamma1) indicate main letter
The signal-to-noise ratio in road and secondary channel, β expression are the ratio of macro small channel SNRs, β=0.7；N0=0dB.N and M indicates the antenna number that macro base station and small base station are respectively disposed
Mesh, N=4, M=4.This fading factor of Lay k=0.8.
Fig. 3 is the system overall transmission rate contrast schematic diagram under three kinds of different antenna selecting methods.As can be seen that application
The corresponding system overall transmission rate of joint antenna selection method designed by the present invention is apparently higher than existing method and (loops through
Method, chance antenna selecting method).
In a practical situation base station to transmission interference caused by user security risk can with the antenna of access system to when changing and
Variation.System overall transmission rate and transmission interference have close association.Chance antenna selecting method sees base station to the interference of user
At definite value, selective goal only includes that transmission channel performance maximizes.Joint antenna selection proposed by the present invention regards transmission interference
For variable, the Signal to Interference plus Noise Ratio of macro channel Yu small channel is obtained according to the status information of interference channel, is optimized system and is always transmitted speed
The expression formula of rate, effectively improves system performance.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
The technical solution as composed by features above any combination.
Claims (8)
1. a kind of joint antenna selection method towards isomery cellular network is applied between base station and user using wireless transmission
Communication system, characterized in that include a macro base station in macrocellular the system comprises a macrocellular and a cellulor
It include a small base station and at least one small user in cellulor, macro base station and small base station are disposed at least one macro user
More antennas；
It the described method comprises the following steps:
In step A. macro base station and small base station in each transmitting antenna to be accessed access isomery cellular network, calculate macro user at this time and
The signal that small user receives；
Step B. is directed to macro channel respectively and small channel executes following steps:
It calculates based on the macro channel and small channel transmission rate in transmitting antenna to be selected access isomery cellular network；
Combine the transmission rate of macro channel and small channel, and then obtains the system overall transmission rate of transmitting antenna pair to be selected；
Step C. selects macro base station transmitting antenna to be selected and small Base Transmitter antenna corresponding to maximum system overall transmission rate to make
For best macro cellulor transmitting antenna pair.
2. a kind of joint antenna selection method towards isomery cellular network according to claim 1, which is characterized in that institute
Stating step A includes；
Macro user receives signalSignal is received with small userCalculation expression it is as follows:
i∈AM,j∈AS
Wherein macro base station M reaches purpose terminal m by i-th transmitting antenna to be selected and is denoted as macro channel MiM, channel response are
Small base station S reaches purpose terminal s by jth root transmitting antenna to be selected and is denoted as small channel SjS, channel response areMacro base station M
Interference channel M is denoted as to the small user s interference generated by i-th antenna to be selectediS, channel response areSmall base station S passes through
Jth root antenna to be selected is denoted as interference channel S to the macro user m interference generatedjM, channel response arexMRepresent macro base station M's
Send signal；xSIndicate the transmission signal of small base station S；AMRepresent the transmitting antenna set of macro base station, ASRepresent the transmitting of small base station
Antenna set, N0Indicate the noise power of transmitting terminal.
3. a kind of joint antenna selection method towards isomery cellular network according to claim 2, which is characterized in that institute
Stating step B specific method includes:
The transmitting signal-to-noise ratio γ of macro base stationMWith the transmitting signal-to-noise ratio γ of small base stationSIt is denoted as respectively:
Wherein, PMIndicate the transmission power of macro base station, PSIndicate the transmission power of small base station；N0Indicate the noise power of transmitting terminal；
According to the reception signal of macro userWith the reception signal of small userThe transmission of macro small channel can be calculated
Rate is as follows:
WhereinIndicate transmission rate of the macro base station M by the macro channel between transmitting antenna i to be selected to macro user m；Table
Show that small base station S passes through the transmission rate of the small channel between transmitting antenna j to be selected to small user s；N indicates the hair of macro base station deployment
Antenna sum is penetrated, M indicates the transmitting antenna sum of small base station deployment,
System overall transmission rate is equal to the sum of the transmission rate of macro small channel, and the system overall transmission rate is expressed as follows:
Wherein RijExpression system overall transmission rate.
4. a kind of joint antenna selection method towards isomery cellular network according to claim 3, which is characterized in that note
XijAnd YijThe Signal to Interference plus Noise Ratio of respectively macro channel and small channel, as follows:
System overall transmission rate formula (7) simplifies are as follows:
5. a kind of joint antenna selection method towards isomery cellular network according to claim 4, which is characterized in that institute
It states in step C, maximum system overall transmission rate is determined to selection criterion using best transmitting antenna, the maximum system is always transmitted
The expression formula of rate is as follows:
The corresponding best transmitting antenna of macro base stationWith the best transmitting antenna in small base stationIt is expressed as follows:
6. a kind of joint antenna selection method towards isomery cellular network according to claim 1, which is characterized in that macro
Honeycomb and cellulor access identical frequency spectrum resource.
7. a kind of joint antenna selection method towards isomery cellular network according to claim 1, which is characterized in that macro
Transmission channel obeys Rayleigh fading between base station and macro user.
8. a kind of joint antenna selection method towards isomery cellular network according to claim 1, which is characterized in that small
Transmission channel between base station and small user obeys this decline of Lay.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112187387A (en) * | 2020-09-22 | 2021-01-05 | 北京邮电大学 | Novel reinforcement learning method based on rasterization user position automatic antenna parameter adjustment |
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| US20130017855A1 (en) * | 2011-07-15 | 2013-01-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Distributed beam selection for cellular communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112187387A (en) * | 2020-09-22 | 2021-01-05 | 北京邮电大学 | Novel reinforcement learning method based on rasterization user position automatic antenna parameter adjustment |
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