CN106385274A - Method and device for distributing pilot frequency in large-scale MIMO system - Google Patents
Method and device for distributing pilot frequency in large-scale MIMO system Download PDFInfo
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- CN106385274A CN106385274A CN201610811493.6A CN201610811493A CN106385274A CN 106385274 A CN106385274 A CN 106385274A CN 201610811493 A CN201610811493 A CN 201610811493A CN 106385274 A CN106385274 A CN 106385274A
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The embodiment of the invention provides a method and device for distributing pilot frequency in a large-scale MIMO system, and the method comprises the steps: districts in a cellular mobile network can be divided into three or four district groups, and adjacent districts in the cellular mobile network belong to different district groups respectively; a to-be-processed current district is acquired; according to channel quality of users in the current district, the users in the current district is sorted, and a sorted user list is obtained; according to pilot frequency disturbance subjected by the users in the current district, pilot frequency sequences respectively used by users in the current district are sorted, and a sorted pilot frequency sequence list is obtained; and according to a preset distribution rule, the pilot frequency sequences in the pilot frequency sequence list are respectively re-distributed to the users in the user list. According to the embodiment of the invention, pilot pollution between districts in different groups can be removed, the pilot pollution between districts in the same groups can be further reduced, and communication performance of the large-scale MIMO system can be improved.
Description
Technical field
The present invention relates to mobile communication technology field, the side of pilot tone distribution in more particularly to a kind of extensive mimo system
Method and device.
Background technology
Developing rapidly with mobile communication technology, the utilization rate improving frequency spectrum resource becomes the more and more urgent weight solving
Want problem.Multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) technology is arisen at the historic moment, MIMO technology
Multiple parallel space transmission channel can be built, realize movable signal by setting up many antennas in transmitting terminal and receiving terminal
In the multiplexing in spatial domain space, it is greatly enhanced the availability of frequency spectrum.Subsequently, the development of MIMO technology has derived extensive MIMO again
Technology.Compare traditional MIMO technology, extensive MIMO technology can be by setting up the little sky of low-power of enormous amount in base station end
Line, spectrum efficiency is lifted 1～2 order of magnitude, can be effectively improved communication performance and more energy saving.
At present, whether the communication performance of extensive MIMO technology depends greatly on base station end and can accurately obtain and work as
The channel condition information (Channel State Information, CSI) of front upper and lower line link is in actual applications, mobile logical
Letter system would generally obtain CSI in real time using the channel estimation technique based on pilot tone.But because pilot resources are at full stretch,
In practical application, the user of different districts would generally be allocated same group or non-orthogonal pilot frequency sequence.So, base station end exists
When the uplink information being sent according to local user is to carry out channel estimation, the CSI obtaining be not only local user and base station it
Between channel information, but used by neighbor cell user same pilot sequence pollution after channel information.It can be seen that, mobile
The pilot pollution that pilot frequency multiplexing between cellular network cell causes significantly limit using extensive MIMO technology in frequency spectrum
The performance boost of the aspect such as efficiency and power efficiency.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of method and device of pilot tone distribution in extensive mimo system, with
Reduce the pilot pollution between cellular cell, lift the communication performance of extensive mimo system.Concrete technical scheme is as follows：
For reaching above-mentioned purpose, the embodiment of the invention discloses a kind of method that in extensive mimo system, pilot tone is distributed,
It is applied to cellular mobile network, methods described includes：Cell in described cellular mobile network is divided into three or four
Cell group, makes the neighbor cell in described cellular mobile network be belonging respectively to different cell group；From described cell group
The pending current area of middle acquisition；According to default first ordering rule, according to the channel of user each in described current area
Quality, is ranked up to the user in described current area, the user list after being sorted；According to the default second sequence rule
Then, the Pilot Interference amount being subject to according to user each in described current area, uses respectively to each user in described current area
Pilot frequency sequence is ranked up, the pilot frequency sequence list after being sorted；According to default allocation rule, described pilot frequency sequence is arranged
Each pilot frequency sequence in table is reassigned to each user in described user list respectively；Wherein, described default allocation rule
It is good including the big pilot frequency sequence of Pilot Interference amount in described pilot frequency sequence list is distributed to channel quality in described user list
User, the little pilot frequency sequence of Pilot Interference amount in described pilot frequency sequence list is distributed to channel quality in described user list
The user of difference.
Preferably, described default first ordering rule includes ordering rule from big to small, and described channel quality includes
Channel power；Described according to default first ordering rule, according to the channel quality of user each in described current area, to described
User in current area is ranked up, the step of the user list after being sorted, including：According to sequence rule from big to small
Then, according to the corresponding channel power of user each in described current area, the user in described current area is ranked up, obtains
User list after sequence.
Preferably, described default second ordering rule includes ordering rule from big to small, described Pilot Interference amount bag
Include Pilot Interference power；Described according to default second ordering rule, the pilot tone being subject to according to user each in described current area
Interference volume, the pilot frequency sequence that each user in described current area is used respectively is ranked up, the pilot frequency sequence after being sorted
The step of list, including：According to ordering rule from big to small, the Pilot Interference being subject to according to user each in described current area
Power, the pilot frequency sequence that each user in described current area is used respectively is ranked up, the pilot frequency sequence row after being sorted
Table.
Preferably, described according to default allocation rule, each pilot frequency sequence in described pilot frequency sequence list is weighed respectively
The step being newly assigned to each user in described user list, including：By respectively leading in the described pilot frequency sequence list after sequence
Frequency sequence be sequentially allocated discharge sequence from big to small after described user list in each user.
Preferably, corresponding pilot time slot is spaced to described different cell group respectively.
The embodiment of the invention also discloses pilot tone assigned unit in a kind of extensive mimo system, it is applied to honeycomb and moves
Network, described device includes：Division unit, for by the cell in described cellular mobile network be divided into three or four little
Differentiation group, makes the neighbor cell in described cellular mobile network be belonging respectively to different cell group；Acquiring unit, for from institute
State and in cell group, obtain pending current area；First sequencing unit, for according to default first ordering rule, according to
The channel quality of each user in described current area, is ranked up to the user in described current area, the use after being sorted
Family list；Second sequencing unit, for according to default second ordering rule, being subject to according to user each in described current area
Pilot Interference amount, the pilot frequency sequence that each user in described current area is used respectively is ranked up, the pilot tone after being sorted
Sequence list；Allocation unit, for according to default allocation rule, by each pilot frequency sequence difference in described pilot frequency sequence list
It is reassigned to each user in described user list；Wherein, described default allocation rule includes arranging described pilot frequency sequence
In table, the big pilot frequency sequence of Pilot Interference amount distributes to the good user of channel quality in described user list, by described pilot frequency sequence
In list, the little pilot frequency sequence of Pilot Interference amount distributes to the user of bad channel quality in described user list.
Preferably, described default first ordering rule includes ordering rule from big to small, and described channel quality includes
Channel power；Described first sequencing unit, specifically for according to ordering rule from big to small, according to each in described current area
The corresponding channel power of user, is ranked up to the user in described current area, the user list after being sorted.
Preferably, described default second ordering rule includes ordering rule from big to small, described Pilot Interference amount bag
Include Pilot Interference power；Described second sequencing unit, specifically for according to ordering rule from big to small, according to described currently little
The Pilot Interference power that in area, each user is subject to, the pilot frequency sequence that each user in described current area is used respectively is arranged
Sequence, the pilot frequency sequence list after being sorted.
Preferably, described allocation unit, specifically for by sequence after described pilot frequency sequence list in each pilot frequency sequence
It is sequentially allocated each user in the described user list after discharge sequence from big to small.
Preferably, corresponding pilot time slot is spaced to described different cell group respectively.
The method and device of pilot tone distribution in a kind of extensive mimo system provided in an embodiment of the present invention, can be by honeycomb
Cell in mobile network is divided into three or four cell group so that neighbor cell belongs to different cell group, and
The corresponding pilot time slot of cell in the packet of different districts is spaced；And according to user in pending current area
Corresponding channel quality and Pilot Interference amount, are ranked up respectively to the user in current area and pilot frequency sequence, are sorted
User list after rear pilot frequency sequence list and sequence, and according to default allocation rule, pilot frequency sequence is reassigned to use
Family；Specifically, pilot frequency sequence big for Pilot Interference amount in pilot frequency sequence list can be distributed to channel quality in user list
Good user, pilot frequency sequence little for Pilot Interference amount in pilot frequency sequence list is distributed to the use of bad channel quality in user list
Family.In such manner, it is possible to avoid the Pilot Interference between neighbor cell；And by again distributing to user according to default allocation rule
Pilot frequency sequence, to improve the communication quality of the poor user of channel power, makes the communication quality of each user in cell be held in one
Individual equilibrium state it is ensured that in cell all users communication efficiency.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart of pilot distribution method in the extensive mimo system of the embodiment of the present invention；
Fig. 2 is the signal that the cell in cellular mobile network is divided into three cell group in the embodiment of the present invention
Figure；
Fig. 3 is the signal that the cell in cellular mobile network is divided into four cell group in the embodiment of the present invention
Figure；
Fig. 4 is the pilot time slot schematic diagram of three cell group in the embodiment of the present invention；
Fig. 5 is the pilot time slot schematic diagram of four cell group in the embodiment of the present invention；
Fig. 6 is a kind of structure chart of pilot distribution device in the extensive mimo system of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the invention discloses a kind of method that in extensive mimo system, pilot tone is distributed.Referring to Fig. 1, Fig. 1 is this
In the extensive mimo system of inventive embodiments, a kind of flow chart of pilot distribution method, comprises the steps：
Step 101, the cell in cellular mobile network is divided into three or four cell group, so that described honeycomb is moved
Neighbor cell in dynamic network is belonging respectively to different cell group；
The embodiment of the present invention goes for the cellular mobile network system using extensive MIMO.
Specifically, in embodiments of the present invention, the cell in cellular mobile network can be divided at least three cells
Packet, under normal circumstances for three or four cell group, makes the neighbor cell in cellular mobile network be belonging respectively to difference
Cell group.Below taking three and four cell group as a example, cell group is described in detail：
When cell in cellular mobile network is divided into three cell group, the schematic diagram of little Division as shown in Fig. 2
Fig. 2 is the schematic diagram that the cell in cellular mobile network is divided into three cell group in the embodiment of the present invention.In Fig. 2
In, the cell of different colours mark is belonging respectively to different cell group；Wherein, it is little that the cell that white colours mark belongs to first
Differentiation group, the cell of Dark grey mark belongs to second community packet, and the cell of black color mark belongs to the 3rd cell group.With
Number in 3rd cell group be 4 cell as a example, numbering be 4 cell neighbor cell include first community packet in number
Three cells for 48,6 and 9 and second community packet in number be 2,5 and 47 three cells.It can be seen that, numbering be 4 little
Area belongs to different cell group from six neighbor cells.
When cell in cellular mobile network is divided into four cell group, the schematic diagram of little Division as shown in figure 3,
Fig. 3 is the schematic diagram that the cell in cellular mobile network is divided into four cell group in the embodiment of the present invention.In Fig. 3
In, the cell of different colours mark is belonging respectively to different cell group；Wherein, it is little that the cell that white colours mark belongs to first
Differentiation group, the cell of Dark grey color mark belongs to second community packet, and the cell of black color mark belongs to the 3rd little differentiation
Group, the cell of light grey color mark belongs to the 4th cell group.By number in the 3rd cell group be 8 cell as a example, compile
Code for 8 cell neighbor cell include first community packet in number be 5 and 13 two cells, second community packet in compile
Number for 3 and 7 two cells, and number in the 4th cell group be 2 and 14 two cells.It can be seen that, numbering is 8 cell
Belong to different cell group from six neighbor cells.
In one preferred embodiment of the invention, corresponding pilot time slot is mutual to the packet of described different districts respectively
Every.
Below taking three and four cell group as a example, to cell group, corresponding pilot time slot is described in detail：
When cell in cellular mobile network is divided into three cell group, during each cell group corresponding pilot tone of difference
The schematic diagram of gap is as shown in figure 4, Fig. 4 is the pilot time slot schematic diagram of three cell group in the embodiment of the present invention.In Fig. 4
In, oblique line filling part is divided into the pilot time slot of first community packet, and grid filling part is divided into the pilot time slot of second community packet,
Vertical line filling part is divided into the pilot time slot of the 3rd cell group；It can be seen that, the pilot time slot of three cell group does not all have in time domain
There is overlap, be spaced, thus eliminating the pilot pollution between the packet of different districts from time domain.
When cell in cellular mobile network is divided into four cell group, during each cell group corresponding pilot tone of difference
The schematic diagram of gap is as shown in figure 5, Fig. 5 is the pilot time slot schematic diagram of four cell group in the embodiment of the present invention.In Fig. 5
In, oblique line filling part is divided into the pilot time slot of first community packet, and grid filling part is divided into the pilot time slot of second community packet,
Vertical line filling part is divided into the pilot time slot of the 3rd cell group；Horizontal line filling part is divided into the pilot time slot of the 4th cell group；Can
See, the pilot time slot of four cell group does not all have overlap in time domain, be spaced, thus eliminating difference from time domain
Pilot pollution between cell group.
Step 102, obtains pending current area from described cell group；
In specific implementation process, can obtain from the cell group of cellular mobile network need to be to be processed currently little
Area.
Step 103 is according to default first ordering rule, according to the channel quality of user each in described current area, right
User in described current area is ranked up, the user list after being sorted；
It should be noted that in embodiments of the present invention, the first ordering rule can be from big to small, or from little to
Greatly, or other ordering rules.For the ease of description, the embodiment of the present invention with the first ordering rule be from big to small sequence rule
Illustrate as a example then, the present invention is not any limitation as to the first ordering rule of community user.
In another preferred embodiment of the invention, described channel quality can include channel power；
Described according to default first ordering rule, according to the channel quality of user each in described current area, to described
User in current area is ranked up, the step of the user list after being sorted, including：
According to ordering rule from big to small, according to the corresponding channel power of user each in described current area, to described
User in current area is ranked up, the user list after being sorted.
Specifically, shown in channel power expression formula such as formula (1)：
In formula (1), akRepresent the channel power between the user k base station corresponding with cell i in cell i；Represent the large scale decline of channel between user k and the cell i respective base station in cell i；Represent in cell i
User k and cell i respective base station between channel shadow fading, andObey logarithm normal distribution；dikiRepresent in cell i
User k the distance between to the corresponding base station of cell i；γ is fading coefficients.It should be noted that channel power akIt is bigger,
Illustrate that the quality of channel is better.
Next, according to the channel power between user each in current area base station corresponding with current area, according to from
Arrive little ordering rule greatly, each user in current area is ranked up, the user list after being sorted, such as formula (2)
Shown：
In formula (2), FaIt is the channel power list after sorting according to ordering rule from big to small, p1,p2,...,
pkIt is respectively the channel power list after sortingCorresponding user list is it is seen then that p1,p2,...,pkBe by
According to the user list after channel power sequence.
Step 104, according to default second ordering rule, the Pilot Interference being subject to according to user each in described current area
Amount, the pilot frequency sequence that each user in described current area is used respectively is ranked up, the pilot frequency sequence list after being sorted；
It should be noted that in embodiments of the present invention, the second ordering rule can be specifically from big to small, or from little
To big, or other ordering rules, can identical from the first ordering rule naturally it is also possible to different with the first ordering rule.For
It is easy to describe, the embodiment of the present invention is with the second ordering rule identical with the first ordering rule, the sequence being from big to small is advised
Illustrate as a example then, the present invention is not any limitation as to the second ordering rule of district pilots sequence.
In another preferred embodiment of the present invention, described Pilot Interference amount can include Pilot Interference power；
Described according to default second ordering rule, the Pilot Interference amount being subject to according to user each in described current area,
The pilot frequency sequence that each user in described current area is used respectively is ranked up, the step of the pilot frequency sequence list after being sorted
Suddenly, including：
According to ordering rule from big to small, the Pilot Interference power being subject to according to user each in described current area, right
The pilot frequency sequence that in described current area, each user uses respectively is ranked up, the pilot frequency sequence list after being sorted.
Specifically, shown in the expression formula such as formula (3) of user's corresponding Pilot Interference power：
In formula (3), bkRepresent when the use in other cells in addition to cell i in the cell group residing for cell i
During multiplexed pilot sequence k of family, Pilot Interference power that the user k in cell i is caused；Represent the use in cell j
The large scale decline of channel between family k and cell i respective base station；Represent cell j in user k and cell i respective base station it
Between channel shadow fading, andObey logarithm normal distribution；dikjUser k in expression cell j is to the corresponding base station of cell i
The distance between；γ is fading coefficients.It should be noted that the Pilot Interference that user is subject to is more serious, the pilot tone that user is subject to
Interference volume is bigger, user corresponding Pilot Interference power bkAlso bigger, illustrate that the quality of pilot tone is poorer.
Next, the Pilot Interference power being subject to respectively according to user each in current area, according to sequence from big to small
Rule, the pilot frequency sequence that user in current area is used is ranked up, the pilot frequency sequence list after being sorted, such as formula
(4) shown in：
In formula (4), FbBe according to ordering rule from big to small after Pilot Interference power list, q1,q2,...,qk
It is respectively the Pilot Interference power list after sortingCorresponding pilot frequency sequence list is it is seen then that q1,q2,...,qk
It is the pilot frequency sequence list after sorting according to Pilot Interference power.
Step 105, according to default allocation rule, each pilot frequency sequence in described pilot frequency sequence list is divided respectively again
Each user in user list described in dispensing；Wherein, described default allocation rule includes to lead in described pilot frequency sequence list
The big pilot frequency sequence of frequency interference volume distributes to the good user of channel quality in described user list, by described pilot frequency sequence list
The little pilot frequency sequence of Pilot Interference amount distributes to the user of bad channel quality in described user list.
It should be noted that default allocation rule can be from list head to list tail, the allocation rule that is sequentially allocated,
Can also be according to from list tail to list head, the allocation rule that is sequentially allocated naturally it is also possible to be other allocation rule, this
Bright allocation rule is not limited.
In the still another preferable embodiment of the present invention, when default first ordering rule is sequence rule from big to small
Then, and when default second ordering rule is ordering rule from big to small, described according to default allocation rule, lead described
The step that each pilot frequency sequence in frequency sequence list is reassigned to each user in described user list respectively, including：
Each pilot frequency sequence in described pilot frequency sequence list after sequence is sequentially allocated the institute after discharge sequence from big to small
State each user in user list.
Specifically, default allocation rule be from list head to list tail, the allocation rule that is sequentially allocated, can will be described
In pilot frequency sequence list, first pilot frequency sequence distributes to first user in described user list, by described pilot frequency sequence list
In second pilot frequency sequence distribute to second user in described user list, be sequentially allocated, until by described pilot frequency sequence arrange
In table, last pilot frequency sequence distributes to last user in described user list.
It should be noted that because the signal interference ratio (Signal to Interference Ratio, SIR) of user being capable of body
Existing communication quality between user and base station, in embodiments of the present invention, can be by by redistributing in cell user and leading
The corresponding relation of frequency sequence, by user each in cell, corresponding SIR all remains equilibrium value respectively, improves channel quality in cell
In the communication quality of poor user, and then guarantee cell, the communication quality of all users is in preferable states.
Specifically, each user can be calculated according to the corresponding channel power of user each in cell and Pilot Interference power
Corresponding SIR.Based on formula (1) and formula (3), shown in the expression formula such as formula (5) of SIR：
In formula (5), SIRkRepresent the SIR, a of the user k in cell ikRepresent the user k in cell i and cell i pair
Answer the channel power between base station, bkRepresent when the use in other cells in addition to cell i in the cell group residing for cell i
Pilot Interference power during multiplexed pilot sequence k of family, the user k in cell i being caused.
It should be understood that less for channel power, that is, the user that the channel quality and base station between is poor, permissible
Distribution Pilot Interference lower-powered high-quality pilot frequency sequence, to lift the communication quality of this certain customers.For channel power
Larger, that is, the preferable user of the channel quality and base station between, can distribute Pilot Interference power larger ropy
Pilot frequency sequence；Because the channel quality of this certain customers is preferable, the harmful effect control that ropy pilot frequency sequence can be brought
System is in the reasonable scope it is ensured that the communication quality of this certain customers, in such manner, it is possible to ensure that the preferable user's of channel quality is logical
Under the premise of letter quality, preferable for quality pilot frequency sequence is distributed to the poor user of channel quality, finally makes in current area
Total user can experience satisfied communication service.
It can be seen that, the cell in cellular mobile network can be divided into three or four little differentiations by the embodiment of the present invention
Group is so that neighbor cell belongs to different cell group；The pilot time slot of wherein different cell group is spaced；With
And according to the corresponding channel power of user in pending current area and the Pilot Interference power being subject to, respectively to current area
In user and pilot frequency sequence be ranked up, the pilot frequency sequence list after being sorted and sequence after user list, and according to
Pilot frequency sequence is reassigned to user by default allocation rule.Specifically, can be by Pilot Interference amount in pilot frequency sequence list
Big pilot frequency sequence distributes to the good user of channel quality in user list, by little the leading of Pilot Interference amount in pilot frequency sequence list
Frequency sequence distributes to the user of bad channel quality in user list.In such manner, it is possible to the pilot tone eliminating between the packet of different districts is done
Disturb；And done with the pilot tone of group cell by again reducing further to user's distribution pilot frequency sequence according to default allocation rule
Disturb, make the communication quality of all users in cell be held at an equilibrium state, provide for all users in cell high-quality
The communication service of amount.
Above joint pilot allocation algorithm is that the pilot time slot in each packet cell carries out entering when channel estimation simultaneously
Row, both can calculate when number of antennas for infinite when corresponding user theory SIR have it is also possible to calculate when number of antennas
The actual SIR of corresponding user, thus verifying the technique effect of embodiment of the present invention methods described, comprises the following steps that in limited time：
First, in cellular mobile network, the corresponding base station of cell, all using linearly disposed antenna array, does not consider OFDM
(Orthogonal Frequency Division Multiplexing, OFDM) subcarrier subscript, base station i is in pilot time slot
Shown in the information representation formula such as formula (6) receiving：
In formula (6), YiRepresent the user profile that base station i receives in pilot time slot；gikjRepresent the user k of cell j
To the channel vector of cell i respective base station, K represents the number of users of cell.sk=[sk1… skK] represent leading of user k use
Frequency sequence, meets orthogonality between different pilot frequency sequences, and | sk|2=K.Wherein, the user k of cell j is to cell i respective base station
Channel vector expression formula such as formula (7) shown in：
In formula (7),Represent that between the user k in cell j and cell i respective base station, channel large scale declines
Fall；Represent the shadow fading of the user k channel between cell i respective base station in cell j, andObey lognormal to divide
Cloth；dikjRepresent user k in cell j the distance between to cell i respective base station；γ represents fading coefficients；hikjRepresent cell j
In user k to channel and cell i respective base station between multipath fading, and hikjM × 1 dimension for obeying CN (0,1) is independent
Same distribution variables；Represent the downlink transmission power of the user k in cell l；GilRepresent that the corresponding base station of cell l is arrived
Channel matrix between cell i respective base station；WhereinRepresent cell i respective base station and cell l
The large scale decline of channel between respective base station,Represent the shade of channel between user and the cell i respective base station in cell l
Decline, andObey logarithm normal distribution；dilRepresent cell l the distance between to cell i respective base station；HilRepresent in cell j
User k and cell i respective base station between channel multipath fading, and HilIt is to obey CN (0, IM) M × M dimension independent with point
Cloth stochastic variable；WklRepresent the corresponding precoding vector of user k in cell l, and Represent and obtain in base station end
The estimation channel vector arriving, | | | |FRepresent F norm；VklRepresent the data message of the user k being sent in cell l, and VklClothes
From CN (0,1) distribution；ZiRepresent white Gaussian noise, and ZiObey CN (0, σ2IM) distribution.
Next, base station to base station i in formula (6) pilot time slot information Y receivingiCarry out least square channel
Estimate, shown in the expression formula such as formula (8) of estimating channel information：
Because embodiment of the present invention methods described only considers the uplink information sending time slots of user, cell i respective base station connects
Shown in the user uplink information representation formula receiving such as formula (9)：
In formula (9), xkjRepresent the uplink information that the user k in cell j sends, and xkjObey CN (0,1) distribution；
gikjRepresent the channel vector of the user k of cell j to cell i respective base station；ZiRepresent white Gaussian noise, and ZiObey CN (0, σ2IM) distribution.
Next, formula (9) is carried out with maximum-ratio combing reception, shown in the expression formula such as formula (10) of receive information：
In formula (10),Represent what the user k in the cell i receiving sent to cell i respective base station
Uplink information；Represent the pilot pollution that the user k in cell i is subject to；znRepresent the user k in cell i
Other interference being subject to and noise sum, obey the Gaussian random variable of 0 average finite value variance distribution.
By formula (10), the corresponding SIR of base station uplink receiving information, expression formula such as formula (11) institute of SIR can be obtained
Show：
In formula (11), SIRikRepresent the corresponding SIR of user k in cell i；When the antenna amount of base station tends to infinite
When, formula (11) can be simplified, shown in the such as formula of the expression formula after simplification (12)：
In formula (12), M represents the quantity of antenna for base station, wherein,
In formula (13), βikiRepresent that the large scale of channel between the user k in cell i and cell i respective base station declines
Fall；βikjRepresent the large scale decline of channel between user k and the cell j respective base station in cell i；Wherein,Represent cell i
In user k and cell i respective base station between channel shadow fading, andService is from logarithm normal distribution；dikiRepresent little
User k in area i is to the distance of cell i respective base station；γ represents fading coefficients.
In formula (14), βikjRepresent that the large scale of channel between the user k in cell i and cell j respective base station declines
Fall；βikjRepresent the large scale decline of channel between user k and the cell j respective base station in cell i；Wherein,Represent cell j
In user k and cell i respective base station between channel shadow fading, andService is from logarithm normal distribution；dikjRepresent little
User k in area j is to the distance of cell i respective base station；γ represents fading coefficients.
It can be seen that, in embodiments of the present invention, can be by being grouped to the cell in cellular mobile network and again
Distribute pilot frequency sequence for user, corresponding SIR is maintained at an equilibrium level respectively to make each user in cell；Not only ensure channel
The communication efficiency of the preferable user of quality, more can significantly improve the communication quality of the poor user of channel quality, be that honeycomb moves
Total user in dynamic network provides high-quality communication service.
The embodiment of the invention also discloses pilot tone assigned unit in a kind of extensive mimo system.Referring to Fig. 6, Fig. 6 is
In the extensive mimo system of the embodiment of the present invention, a kind of structure chart of pilot distribution device, specifically can include with lower unit：
Division unit 601, for the cell in described cellular mobile network is divided into three or four cell group,
The neighbor cell in described cellular mobile network is made to be belonging respectively to different cell group；
Acquiring unit 602, for obtaining pending current area from described cell group；
First sequencing unit 603, for according to default first ordering rule, according to user's each in described current area
Channel quality, is ranked up to the user in described current area, the user list after being sorted；
Second sequencing unit 604, for according to default second ordering rule, being subject to according to user each in described current area
The Pilot Interference amount arriving, the pilot frequency sequence that each user in described current area is used respectively is ranked up, after being sorted
Pilot frequency sequence list；
Allocation unit 605, for according to default allocation rule, each pilot frequency sequence in described pilot frequency sequence list being divided
It is not reassigned to each user in described user list；Wherein, described default allocation rule is included described pilot frequency sequence
In list, the big pilot frequency sequence of Pilot Interference amount distributes to the good user of channel quality in described user list, by described pilot tone sequence
In row list, the little pilot frequency sequence of Pilot Interference amount distributes to the user of bad channel quality in described user list.
In a kind of alternative embodiment of the present invention, described default first ordering rule includes sequence rule from big to small
Then, described channel quality includes channel power；Described first sequencing unit 603, specifically for according to sequence rule from big to small
Then, according to the corresponding channel power of user each in described current area, the user in described current area is ranked up, obtains
User list after sequence.
In another kind of alternative embodiment of the present invention, described default second ordering rule includes sequence from big to small
Rule, described Pilot Interference amount includes Pilot Interference power；Described second sequencing unit 604, specifically for according to from big to small
Ordering rule, the Pilot Interference power being subject to according to user each in described current area, to each user in described current area
The pilot frequency sequence using respectively is ranked up, the pilot frequency sequence list after being sorted.
In another alternative embodiment of the present invention, described allocation unit 605, specifically for will sequence after described in lead
Each pilot frequency sequence in frequency sequence list be sequentially allocated discharge sequence from big to small after described user list in each user.
In another alternative embodiment of the present invention, corresponding pilot time slot is mutual to the packet of described different districts respectively
Interval.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
Each embodiment in this specification is all described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Real especially for system
For applying example, because it is substantially similar to embodiment of the method, so description is fairly simple, referring to embodiment of the method in place of correlation
Part illustrate.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.All
Any modification, equivalent substitution and improvement made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
Interior.
Claims (10)
1. in a kind of extensive mimo system pilot tone distribution method it is characterised in that being applied to cellular mobile network, described side
Method includes：
Cell in described cellular mobile network is divided into three or four cell group, makes in described cellular mobile network
Neighbor cell be belonging respectively to different cell group；
Pending current area is obtained from described cell group；
According to default first ordering rule, according to the channel quality of user each in described current area, to described current area
In user be ranked up, the user list after being sorted；
According to default second ordering rule, the Pilot Interference amount being subject to according to user each in described current area, work as to described
The pilot frequency sequence that in front cell, each user uses respectively is ranked up, the pilot frequency sequence list after being sorted；
According to default allocation rule, each pilot frequency sequence in described pilot frequency sequence list is reassigned to described user respectively
Each user in list；Wherein, include will be big for Pilot Interference amount in described pilot frequency sequence list for described default allocation rule
Pilot frequency sequence distributes to the good user of channel quality in described user list, will be little for Pilot Interference amount in described pilot frequency sequence list
Pilot frequency sequence distribute to the user of bad channel quality in described user list.
2. method according to claim 1 is it is characterised in that described default first ordering rule is included from big to small
Ordering rule, described channel quality includes channel power；
Described according to default first ordering rule, according to the channel quality of user each in described current area, to described current
User in cell is ranked up, the step of the user list after being sorted, including：
According to ordering rule from big to small, according to the corresponding channel power of user each in described current area, to described current
User in cell is ranked up, the user list after being sorted.
3. method according to claim 1 is it is characterised in that described default second ordering rule is included from big to small
Ordering rule, described Pilot Interference amount includes Pilot Interference power；
Described according to default second ordering rule, the Pilot Interference amount being subject to according to user each in described current area, to institute
State the pilot frequency sequence that in current area, each user uses respectively to be ranked up, the step of the pilot frequency sequence list after being sorted,
Including：
According to ordering rule from big to small, the Pilot Interference power being subject to according to user each in described current area, to described
The pilot frequency sequence that in current area, each user uses respectively is ranked up, the pilot frequency sequence list after being sorted.
4. according to the arbitrary described method of claims 1 to 3 it is characterised in that described according to default allocation rule, will be described
The step that each pilot frequency sequence in pilot frequency sequence list is reassigned to each user in described user list respectively, including：
Each pilot frequency sequence in described pilot frequency sequence list after sequence is sequentially allocated the described use after discharge sequence from big to small
Each user in the list of family.
5. method according to claim 1 is it is characterised in that described different cell group distinguishes corresponding pilot time slot
It is spaced.
6. in a kind of extensive mimo system pilot tone assigned unit it is characterised in that being applied to cellular mobile network, described dress
Put including：
Division unit, for the cell in described cellular mobile network is divided into three or four cell group, makes described
Neighbor cell in cellular mobile network is belonging respectively to different cell group；
Acquiring unit, for obtaining pending current area from described cell group；
First sequencing unit, for according to default first ordering rule, according to the channel matter of user each in described current area
Amount, is ranked up to the user in described current area, the user list after being sorted；
Second sequencing unit, for according to default second ordering rule, according to leading that user each in described current area is subject to
Frequency interference volume, the pilot frequency sequence that each user in described current area is used respectively is ranked up, the pilot tone sequence after being sorted
Row list；
Allocation unit, for according to default allocation rule, each pilot frequency sequence in described pilot frequency sequence list being distinguished again
Distribute to each user in described user list；Wherein, described default allocation rule is included in described pilot frequency sequence list
The big pilot frequency sequence of Pilot Interference amount distributes to the good user of channel quality in described user list, by described pilot frequency sequence list
The little pilot frequency sequence of middle Pilot Interference amount distributes to the user of bad channel quality in described user list.
7. device according to claim 6 is it is characterised in that described default first ordering rule is included from big to small
Ordering rule, described channel quality includes channel power；
Described first sequencing unit, specifically for according to ordering rule from big to small, according to user each in described current area
Corresponding channel power, is ranked up to the user in described current area, the user list after being sorted.
8. device according to claim 6 is it is characterised in that described default second ordering rule is included from big to small
Ordering rule, described Pilot Interference amount includes Pilot Interference power；
Described second sequencing unit, specifically for according to ordering rule from big to small, according to user each in described current area
The Pilot Interference power being subject to, the pilot frequency sequence that each user in described current area is used respectively is ranked up, and is sorted
Pilot frequency sequence list afterwards.
9. according to the arbitrary described device of claim 6 to 8 it is characterised in that described allocation unit, after sorting
Described pilot frequency sequence list in each pilot frequency sequence be sequentially allocated discharge sequence from big to small after described user list in each
User.
10. device according to claim 6 it is characterised in that described different cell group respectively corresponding pilot tone when
Gap is spaced.
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| CN113890710A (en) * | 2021-10-09 | 2022-01-04 | 南京邮电大学 | Pilot frequency distribution method for large-scale de-cellular MIMO system |
| CN113890710B (en) * | 2021-10-09 | 2024-02-20 | 南京邮电大学 | Pilot frequency distribution method for de-cellular large-scale MIMO system |
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