CN109257134A - A kind of multi cell cellular network interferences alignment schemes based on full duplex base station - Google Patents
A kind of multi cell cellular network interferences alignment schemes based on full duplex base station Download PDFInfo
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- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
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Abstract
The method for the multi cell cellular network interferences alignment based on full duplex base station that the invention proposes a kind of, it is intended to improve the power system capacity of multi cell cellular network system, realize step are as follows: determine cellular cell position coordinates；Select user group；Construction interference alignment matrix, decoding matrix and receiving matrix；Uplink user sends the first time slot uplink signal, and base station decodes the first time slot uplink signal, while sending the first time slot downlink signal；Uplink user sends the second time slot uplink signal, while base station sends the second time slot downlink signal；Downlink user obtains decoded signal.The present invention uses full duplex base station in each cellular cell, uplink user and base station pass through two time slots respectively and send signal to base station and downlink user, and base stations united transmission and the decoded signal of the base station and neighboring community of each cellular cell, effectively eliminate the uplink and downlink interference and inter-cell interference of more cellular cell full-duplex communications, compared with prior art, the power system capacity of system is improved.
Description
Technical field
The invention belongs to fields of communication technology, are related to a kind of multi cell cellular network interferences alignment based on full duplex base station
Method can be used in multi cell cellular network in the wireless communication system of base station operation in a full-duplex mode
Background technique
In traditional cellular network, base station and user work in semiduplex mode, i.e. uplink user and downlink user
It is worked respectively in different frequency bands, and uplink and downlink user job may be implemented in identical frequency band in full duplex base station.Compared to half
Duplex communication, full-duplex communication can theoretically promote one times of power system capacity.But full-duplex communication also brings two
New problem urgently to be resolved: first is that there are self-interferences between base station end uplink antenna and uplink/downlink antenna；Second is that the same base of uplink user
When station is transmitted, exist simultaneously this uplink user to downlink user channel, therefore can communication band to downlink user do
It disturbs.In the communication of multi cell cellular network, the interference of full-duplex communication bring is more significant, not only there is the uplink and downlink in cell
Inter-user interference, there are also the interference of the upstream and downstream user of minizone, in addition there are inter-cell uplink users to the interference of base station and
Interference of the minizone base station to downlink user, these interference compromise system performance significantly, reduce full duplex bring capacity
Gain.There are many methods that can eliminate the self-interference of base station end at present, therefore has limited multiple cell full duplex cellular system
The principal element of system capacity is exactly same district and transregional interference of the uplink user to downlink user, and uplink user is to the transregional dry of base station
It disturbs and transregional interference of the base station to downlink user.In order to eliminate these interference, interference management is at multiple cell full-duplex communication
One of key areas.
Common interference management techniques have time division multiple acess, frequency division multiple access, CDMA and interference alignment etc., and interference alignment can
To effectively improve the capacity of system, its main thought is to make interference and desired signal difference by the encoder matrix of transmitting terminal
It is mapped to different subspaces, the kernel of interference eliminates interference in receiving end.
Interference alignment techniques achieve good system capacity gain in single cell half-duplex operation, but with cell
Several increases, the interference between cell also increase therewith, and half-duplex has introduced uplink user under to the development of full-duplex communication
The interference of row user, the interference for needing to be aligned is more and more, has seriously affected improvement of the interference alignment to system performance.
In order to improve the power system capacity of multiple cell ascending honeycomb network, the paper that Vasilis et al. is delivered at it
" Cellular interference alignment:omni-directional antennas and asymmetric
configurations”(IEEE Transactions on Information Theory,2015,61(12):6663-
6679) in, a kind of interference alignment schemes for multiple cell ascending honeycomb network are proposed, this method is offset by stepwise derivation
The two-way interference for changing minizone is unidirectional interference, then by closing partial cell cell and carrying out sub-clustering in remaining minizone,
Allow each cell in cluster to be aligned the interference from neighboring community, obtains higher power system capacity, lacked existing for this method
Falling into is the communication that only considered ascending honeycomb network, and in the communication process of uplink user and base station, downlink user can not be simultaneously
Communication, compared with the cellular network communication based on full duplex base station, has lost power system capacity.
Summary of the invention
It is an object of the invention to overcome the problems of the above-mentioned prior art, propose a kind of based on full duplex base station
The method of multi cell cellular network interferences alignment, it is intended to improve the power system capacity of multi cell cellular network system.
To achieve the above object, the technical solution that the present invention takes includes the following steps:
(1) coordinate of each cellular cell position is determined:
Using include L cellular cell full duplex base station cellular network in any one cellular cell as cell of origin, COO, L >=
5, position coordinates are (0,0), with the line of the central point of (0,0) and cellular cell arbitrarily adjacent with cell of origin, COO for real axis
Positive direction determines other L-1 using smooth gloomy integer Z (the ω)=a+b ω of Ace
The coordinate (a, b) of a cellular cell position,I is imaginary unit；
(2) user group of each cellular cell is selected:
Select the uplink user and two downlink user composition user groups in each cellular cell；
(3) global channel status information, construction interference alignment matrix A, decoding matrix B and receiving matrix are utilized
(4) uplink user in each user group sends the uplink signal of the first time slot, and base station decodes the upper of the first time slot
Row signal, while sending the downlink signal of the first time slot:
Uplink user in (4a) each user group sends the uplink signal of the first time slot to base station:
Coordinate is that the uplink user of the cellular cell of z sends the uplink signal of the first time slot to the base station of same cellWith
The uplink user for the cellular cell that the cellular cell and coordinate that the adjacent coordinate in the cellular cell that coordinate is z is z+1 are z-1- ω,
The uplink signal of the first time slot is respectively sent to the base station of same cellWith
Base station in (4b) each user group is decoded the uplink signal of the first time slot:
Coordinate is that the base station of the cellular cell of z, z-1 and z+1+ ω uses decoding matrix, is combined to being respectively received
First time slot uplink signalWithIt is decoded, obtains decoded first time slot uplink signalWith
Base station in (4c) each user group sends the downlink signal of the first time slot to downlink user:
The downlink signal s sent to two downlink users of same cell is intended into the base station for the cellular cell that coordinate is zdz, and
Cellular cell and coordinate that coordinate is z+1 are that two downlink users to same cell are respectively intended in the base station of the cellular cell of z-1- ω
The downlink signal of transmissionWithColumn vector is formed, and alignment matrix and the column vector premultiplication will be interfered, obtains transition square
Battle array, then by one or two rows of transition matrixThree or four rowsWith five or six rowsRespectively as the base of above three cellular cell
The pre-coding matrix stood, respectively with it is corresponding WithPremultiplication, by premultiplication resultWithAs
The downlink signal of first time slot is sent to the corresponding downlink user in each base station；
(5) uplink user in each user group sends the uplink signal of the second time slot, while base station sends the second time slot
Downlink signal:
(5a) coordinate is the uplink user of the cellular cell of z by the additive phase of the second time slotIt is sent with the first time slot
Uplink signalPremultiplication, coordinate are the uplink user of the cellular cell of z+1 by the additive phase of the second time slotWith first
The uplink signal that time slot is sentPremultiplication, coordinate are the uplink user of the cellular cell of z-1- ω by the additional phase of the second time slot
PositionThe uplink signal sent with the first time slotPremultiplication, and by premultiplication resultWithRespectively as upper
The uplink signal for stating three the second time slots of cellular cell is sent to the corresponding base station of each cell uplink user；
(5b) coordinate is the base station of the cellular cell of z by the additive phase of the second time slotUnder being sent with the first time slot
Row signalPremultiplication, coordinate are the base station of the cellular cell of z+1 by the additive phase of the second time slotIt is sent with the first time slot
Downlink signalPremultiplication, coordinate are the base station of the cellular cell of z-1- ω by the additive phase of the second time slotWith first
The downlink signal that time slot is sentPremultiplication, and by premultiplication resultWithRespectively as above three cellular cell
The downlink signal of second time slot is sent to the corresponding downlink user of each cell base station；
(6) downlink user of the user group of each cellular cell obtains decoded signal:
(6a) coordinate is two downlink users of the cellular cell of z by the receiving matrix of the first time slotWithSecond
The receiving matrix of time slotWithRespectively with the reception signal of the first time slotWithThe reception signal of second time slot
WithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
(6b) coordinate is two downlink users of the cellular cell of z+1 by the receiving matrix of the first time slotWithThe receiving matrix of second time slot is respectivelyWithRespectively with reception signal when the first time slotWithThe reception signal of second time slotWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
(6c) coordinate is two downlink users of the cellular cell of z-1- ω by the receiving matrix of the first time slotWithThe receiving matrix of second time slotWithRespectively with the reception signal of the first time slotWith
The reception signal of second time slotWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
Compared with prior art, the present invention having the advantage that
The present invention uses full duplex base station in each cellular cell, and uplink user and base station pass through two time slots to base respectively
It stands and downlink user sends uplink signal and downlink signal, and the base station of each cellular cell and neighboring community is base stations united
Signal and decoded signal are sent, the uplink and downlink interference and inter-cell interference of more cellular cell full-duplex communications are effectively eliminated,
Uplink user and while base station communication, downlink user can glitch-free and base station communication improve compared with prior art
The power system capacity of system.
Detailed description of the invention
Fig. 1 is implementation flow chart of the invention；
Fig. 2 is that the smooth gloomy rounded coordinate figure of Ace used by the coordinate of cellular cell is determined in the present invention；
Fig. 3 is the simulation comparison figure of the present invention and prior art systems capacity.
Specific embodiment
Referring to the drawings and specific embodiment, present invention is further described in detail.
A kind of multi cell cellular network interferences alignment schemes based on full duplex base station of referring to Fig.1, include the following steps:
Step 1) determines the coordinate of each cellular cell position:
Each cellular cell includes a full duplex base station, multiple uplink users and multiple downlink users, base station configuration
Antenna number is M, and the antenna number of the configuration of uplink user and downlink user is N, and M=2, N=2, Suo Youfeng is arranged in this fact Example
The uplink user of nest cell is in the additive phase of the second time slotThe base station of all cellular cells is in the additional of the second time slot
Phase is
Using include L cellular cell full duplex base station cellular network in any one cellular cell as cell of origin, COO, L=
5, position coordinates z0It is real with the line of the central point of (0,0) and cellular cell arbitrarily adjacent with cell of origin, COO for (0,0)
Axis positive direction determines the coordinate z of other 4 cellular cells positions using smooth gloomy integer Z (the ω)=a+b ω of Ace1、z2、z3、z4,
Respectively (- 1,0), (1,1), (- 1, -1), (1,0),I is imaginary unit；
Step 2) selects the user group of each cellular cell:
Select the uplink user and two downlink user composition user groups in each cellular cell；
Step 3) constructs decoding matrix and interference alignment matrix:
According to channel state information, construction decoding matrix A and interference alignment matrix B,
Wherein, hik,jK-th of downlink of the cellular cell that the base station for the cellular cell that indicates coordinate is j and coordinate are i is used
Channel coefficients between family, li,jBetween the uplink user for the cellular cell that the base station for the cellular cell that indicates coordinate is j and coordinate are i
Channel coefficients,Indicates coordinate is receiving matrix of k-th of downlink user in m-th of time slot of the cellular cell of j,WithRespectively indicate the additive phase of the base station and uplink user of the cell that coordinate is j in the second time slot, i, j ∈ { Z0,Z1,Z2,Z3,
Z4, k=1,2, []-1It indicates to matrix inversion；
Uplink user in each user group of step 4) sends the uplink signal of the first time slot, and base station decodes the first time slot
Uplink signal, while sending the downlink signal of the first time slot:
Uplink user in each user group of step 4.1) sends the uplink signal of the first time slot to base station:
Coordinate is z0Cellular cell uplink user to the base station of same cell send the first time slot uplink signalWith
The adjacent coordinate in the cellular cell that coordinate is z is z3Cellular cell and coordinate be z4Cellular cell uplink user, respectively to
The uplink signal of the first time slot is sent with the base station of cellWith
Base station in each user group of step 4.2) is decoded the uplink signal of the first time slot:
Coordinate is z0、z1And z2Cellular cell base station use decoding matrix, combine on the first time slot respectively received
Row signalWithIt is decoded,
Obtain decoded first time slot uplink signalWithIt, can be in the future using base stations united decoded method
Desired signal is regarded as from the interference signal of adjacent cells uplink user to solve together.
Base station in each user group of step 4.3) sends the downlink signal of the first time slot to downlink user:
It is z by coordinate0Cellular cell base station intend to same two downlink users of cell send downlink signalIt sits
It is designated as z3Cellular cell and coordinate be z4Cellular cell base station respectively intend to two downlink users of same cell send under
Row signalWithColumn vector is formed, and alignment matrix B and the column vector premultiplication will be interfered, obtains transition Matrix C,
Again by one or two rows of transition matrix CThree or four rowsWith five or six rowsRespectively as above three cellular cell
Base station pre-coding matrix,WithRespectively with it is correspondingWithPremultiplication,
By premultiplication resultWithAs the downlink signal of the first time slot, it is sent to the corresponding downlink in each base station and uses
Family, constructs the pre-coding matrix of base station by interference alignment matrix, and thus one, base station is to adjacent cells downlink user
Interference can be regarded as desired signal, to reduce the interference that downlink user receives；
Uplink user in each user group of step 5) sends the uplink signal of the second time slot, while when base station transmission second
The downlink signal of gap:
Step 5.1) coordinate is z0Cellular cell uplink user by the additive phase of the second time slotWith the first time slot
The uplink signal of transmissionPremultiplication, coordinate z3Cellular cell uplink user by the additive phase of the second time slotWith
The uplink signal that one time slot is sentPremultiplication, coordinate z4Cellular cell uplink user by the additive phase of the second time slotThe uplink signal sent with the first time slotPremultiplication,
And by premultiplication resultWithRespectively as the uplink signal of the second time slot of above three cellular cell, hair
The corresponding base station of each cell uplink user is given, for the second time slot uplink signal that uplink user is sent, base station need not be carried out
Decoding, base station have obtained decoded signal in the first time slot, and the second time slot uplink signal that uplink user is sent can be by downlink
User, which receives, is used to the uplink interference that counteracting downstream user receives in the first time slot；
Step 5.2) coordinate is z0Cellular cell base station by the additive phase of the second time slotIt is sent with the first time slot
Downlink signalPremultiplication, coordinate z3Cellular cell base station by the additive phase of the second time slotIt is sent out with the first time slot
The downlink signal sentPremultiplication, coordinate z4Cellular cell base station by the additive phase of the second time slotWith the first time slot
The downlink signal of transmissionPremultiplication,
And by premultiplication resultWithRespectively as the downlink signal of the second time slot of above three cellular cell, hair
Give each cell base station corresponding downlink user；
The downlink user of the user group of each cellular cell of step 6) obtains decoded signal:
Step 6.1) coordinate is z0Cellular cell two downlink users by the receiving matrix of the first time slotWithThe receiving matrix of second time slotWithRespectively with the reception signal of the first time slotWithSecond time slot
Reception signalWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
Step 6.2) coordinate is z1Cellular cell two downlink users by the receiving matrix of the first time slotWithThe receiving matrix of second time slot is respectivelyWithRespectively with reception signal when the first time slotWithThe
The reception signal of two time slotsWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
The signal of two time slots is merged, the first time slot from uplink user that can be subject to counteracting downstream user and the
Two time slot interferences.
Step 6.3) coordinate is z2Cellular cell two downlink users by the receiving matrix of the first time slot
WithThe receiving matrix of second time slotWithRespectively with the reception signal of the first time slotWith
The reception signal of second time slotWithPremultiplication, the two are added to obtain the decoding letter of each downlink user
NumberWith
Below by way of emulation experiment, technical effect of the invention is described further:
1. simulated conditions and content:
The present invention and the prior art emulate multi cell cellular network system capacity to program in Matlab and realize, setting by
5 cellular cells composition beehive network system, each cellular cell include a uplink user, two downlink users, each
The antenna number that base station, uplink user and the downlink user of cellular cell configure is 2, and channel is declined using the Rayleigh flat of time-varying
Channel, under the conditions of different signal-to-noise ratio, respectively with the interference of the present invention and the multi cell cellular network based on half-duplex base station
Alignment schemes emulate the capacity of cellular system, and result is as shown in Figure 3.
2. analysis of simulation result:
To the present invention and the interference alignment schemes of the multi cell cellular network based on half-duplex base station are by 5 cellular cells
The cellular network of composition, each cellular cell include a uplink user, and power system capacity is imitative under the scene of two downlink users
Very, demonstrating the present invention can be improved the capacity of system.
Reference Fig. 3, the signal-to-noise ratio of horizontal axis expression system, unit dB, longitudinal axis expression power system capacity, unit bps/Hz,
As can be seen that with the raising of signal-to-noise ratio, the interference alignment side of the present invention and the multi cell cellular network based on half-duplex base station
Method power system capacity obtained is in increase trend, while the power system capacity that the present invention obtains system is higher than based on half-duplex base
The interference alignment schemes for the multi cell cellular network stood.
Claims (2)
1. a kind of multi cell cellular network interferences alignment schemes based on full duplex base station, it is characterised in that include the following steps:
(1) coordinate of each cellular cell position is determined:
Using include L cellular cell full duplex base station cellular network in any one cellular cell as cell of origin, COO, L >=5,
Position coordinates are (0,0), are that real axis is square with the line of the central point of (0,0) and cellular cell arbitrarily adjacent with cell of origin, COO
To, the coordinate (a, b) of other L-1 cellular cell positions is determined using smooth gloomy integer Z (the ω)=a+b ω of Ace,I is imaginary unit；
(2) user group of each cellular cell is selected:
Select the uplink user and two downlink user composition user groups in each cellular cell；
(3) global channel status information, construction decoding matrix A, interference alignment matrix B and receiving matrix are utilized
(4) uplink user in each user group sends the uplink signal of the first time slot, and base station decodes the uplink letter of the first time slot
Number, while sending the downlink signal of the first time slot:
Uplink user in (4a) each user group sends the uplink signal of the first time slot to base station:
Coordinate is that the uplink user of the cellular cell of z sends the uplink signal of the first time slot to the base station of same cellCoordinate is z
The uplink user for the cellular cell that+1 cellular cell and coordinate are z-1- ω, respectively sends the first time slot to the base station of same cell
Uplink signalWith
Base station in (4b) each user group is decoded the uplink signal of the first time slot:
Coordinate is that the base station of the cellular cell of z, z-1 and z+1+ ω uses decoding matrix, is combined to first be respectively received
Time slot uplink signalWithIt is decoded, obtains decoded first time slot uplink signalWith
Base station in (4c) each user group sends the downlink signal of the first time slot to downlink user:
The downlink signal sent to same two downlink users of cell is intended into the base station for the cellular cell that coordinate is zAnd coordinate
Respectively intend sending to two downlink users of same cell for the base station for the cellular cell that the cellular cell of z+1 and coordinate are z-1- ω
Downlink signalWithColumn vector is formed, and alignment matrix and the column vector premultiplication will be interfered, obtains transition matrix, then
By one or two rows of transition matrixThree or four rowsWith five or six rowsRespectively as above three cellular cell base station it is pre-
Encoder matrix, respectively with it is correspondingWithPremultiplication, by premultiplication result WithWhen as first
The downlink signal of gap is sent to the corresponding downlink user in each base station；
(5) uplink user in each user group sends the uplink signal of the second time slot, while base station is sent under the second time slot
Row signal:
(5a) coordinate is the uplink user of the cellular cell of z by the additive phase of the second time slotThe uplink sent with the first time slot
SignalPremultiplication, coordinate are the uplink user of the cellular cell of z+1 by the additive phase of the second time slotIt is sent out with the first time slot
The uplink signal sentPremultiplication, coordinate are the uplink user of the cellular cell of z-1- ω by the additive phase of the second time slot
The uplink signal sent with the first time slotPremultiplication, and by premultiplication resultWithRespectively as above three bee
The uplink signal of the second time slot of nest cell is sent to the corresponding base station of each cell uplink user；
(5b) coordinate is the base station of the cellular cell of z by the additive phase of the second time slotThe downlink signal sent with the first time slotPremultiplication, coordinate are the base station of the cellular cell of z+1 by the additive phase of the second time slotThe downlink sent with the first time slot
SignalPremultiplication, coordinate are the base station of the cellular cell of z-1- ω by the additive phase of the second time slotIt is sent out with the first time slot
The downlink signal sentPremultiplication, and by premultiplication resultWithWhen respectively as above three cellular cell the second
The downlink signal of gap is sent to the corresponding downlink user of each cell base station；
(6) downlink user of the user group of each cellular cell obtains decoded signal:
(6a) coordinate is two downlink users of the cellular cell of z by the receiving matrix of the first time slotWithSecond time slot
Receiving matrixWithRespectively with the reception signal of the first time slotWithThe reception signal of second time slotWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
(6b) coordinate is two downlink users of the cellular cell of z+1 by the receiving matrix of the first time slotWithSecond
The receiving matrix of time slot is respectivelyWithRespectively with reception signal when the first time slotWithWhen second
The reception signal of gapWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
(6c) coordinate is two downlink users of the cellular cell of z-1- ω by the receiving matrix of the first time slotWithThe receiving matrix of second time slotWithRespectively with the reception signal of the first time slotWith
The reception signal of second time slotWithPremultiplication, the two are added to obtain the decoded signal of each downlink userWith
2. the multi cell cellular network interferences alignment schemes according to claim 1 based on full duplex base station, feature exist
In decoding matrix A described in step (3), interference alignment matrix B and receiving matrixIts expression formula is respectively as follows:
Wherein, li,jChannel between the uplink user for the cellular cell that the base station for the cellular cell that indicates coordinate is j and coordinate are i
Coefficient, hik,jLetter between k-th of downlink user of the cellular cell that the base station for the cellular cell that indicates coordinate is j and coordinate are i
Road coefficient,Indicates coordinate is receiving matrix of k-th of downlink user in m-th of time slot of the cellular cell of j,With
Respectively indicate the additive phase of the base station and uplink user of the cell that coordinate is j in the second time slot, i, j ∈ { z-1, z+1, z, z-
1- ω, z+1+ ω }, k=1,2, []-1It indicates to matrix inversion.
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| CN109819453A (en) * | 2019-03-05 | 2019-05-28 | 西安电子科技大学 | Cost optimization unmanned plane base station deployment method based on improved adaptive GA-IAGA |
| CN109819453B (en) * | 2019-03-05 | 2021-07-06 | 西安电子科技大学 | Cost optimization unmanned aerial vehicle base station deployment method based on improved genetic algorithm |
| CN114584249A (en) * | 2022-03-02 | 2022-06-03 | 西安电子科技大学 | Interference elimination method for wireless full duplex system |
| CN114584249B (en) * | 2022-03-02 | 2023-10-17 | 西安电子科技大学 | Interference elimination method for wireless full duplex system |
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