CN103701577B - Suppress the pilot distribution method of pilot pollution in cloud wireless access network - Google Patents
Suppress the pilot distribution method of pilot pollution in cloud wireless access network Download PDFInfo
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Abstract
Suppress the pilot distribution method of pilot pollution in a kind of cloud wireless access network, descending arrangement is carried out to whole users according to the size of the large scale fading information quadratic sum of each user to all remote radio heads, the maximum preceding K user of large scale fading information quadratic sum is assigned to using in the corresponding user's set of orthogonal guide frequency information；According still further to the order of large scale fading information quadratic sum from small to large, the square mean error amount that remaining users are sequentially allocated to channel estimation errors is increased in the corresponding user's set of minimum pilot frequency information；Finally, all users send pilot frequency information to remote radio hair, and each remote radio head feeds back to receive information in the base station processing unit pond in high in the clouds, for channel estimation, just obtain whole users to the channel information of each remote radio head.When this method inhibits progress channel estimation in cloud wireless access network, the pilot pollution caused by orthogonal pilot frequency sequence lazy weight improves the precision and transmission reliability of cloud wireless access network channel estimation.
Description
Technical field
The present invention relates to the pilot distribution method for suppressing pilot pollution in a kind of cloud wireless access network, belong to cloud wireless access
Net the technical field of transmission.
Background technology
In order to adapt to high spectrum effect, high energy efficiency, high Intelligent Dynamic and the inexpensive communication requirement in mobile Internet epoch,
People succeed in developing the transmission method and correlation technique of cloud Radio Access Network, and its core is the wireless money multiple traditional base stations
Source is concentrated in together, and for realizing high spectrum effect, the communication requirement of high power capacity, and is realized by the way that the radio frequency parts such as antenna are far put
Wide area is covered, and forms the mixed networking framework of super virtual base station pond and extensive remote radio frequency unit, multiple distal end nothings
Line radio frequency unit is connected to super virtual base station pond, the physical resource of wireless network is carried out by super virtual base station pond global excellent
Change and Radio Resource is virtually multiplexed.
For cloud Radio Access Network, by arranging that large-scale remote radio frequency unit can realize Cellular Networks
The seamless coverage of network, and the physical resource concentrated settings of multiple traditional base stations in super virtual base station pond, to be summarised in
Information is focused on together, the construction of base station site can be both reduced, green networking is realized；Also allow for communication for coordination technology
With reduction inter base station interference, so as to improve spectrum efficiency, is more convenient for concentrating at mass data using cloud computing technology
Reason, realizes dynamic, in real time intelligent networking, so as to meet new generation broadband GSM high spectrum effect, high energy efficiency, intelligence
Dynamic and the demand of inexpensive networking.
At present, cloud wireless access network still has huge technological challenge in terms of networking：First, it is wireless in order to lift cloud
The transmission performance of access network, obtains scale effect, it is necessary to using extensive cooperation technology.But, the realization of the technology is still suffered from
Algorithm complex is high and synchronously realizes many practical problems such as difficulty.Second, due in cloud wireless access network remote radio head and
Number of users is generally all very huge, and the orthogonality in conventional channel estimation between pilot tone can not be guaranteed, and then causes and lead
Frequency is polluted so that estimated accuracy is reduced, and influences transmission performance.Therefore, how these technical barriers is tackled key problems, are solved, just
As scientific and technical personnel's focus of attention in the industry.
The content of the invention
In view of this, it is an object of the invention to provide the pilot tone distribution side for suppressing pilot pollution in a kind of cloud wireless access network
Method, for suppressing to carry out in cloud wireless access network during channel estimation because pilot tone caused by orthogonal pilot frequency sequence lazy weight is dirty
Dye, improves the precision and transmission reliability of cloud wireless access network channel estimation..
In order to achieve the above object, the invention provides the pilot tone distribution for suppressing pilot pollution in a kind of cloud wireless access network
Method, it is characterised in that：Methods described includes following operative step：
（1）According to each user UEnTo the large scale fading information quadratic sum v of all remote radio headsnNumerical values recited pair
N number of whole users carry out descending arrangement altogether, and the user after being sorted is：UE(1)、UE(2)、…、UE(n)、…、UE(N), and meet
v(1)≥v(2)≥…v(n)≥…≥v(N)；Wherein, natural number n is user's sequence number, and its maximum number is N；
（2）By the preceding K user UE after descending sort(1)、UE(2)、…、UE(K)It is respectively configured and is believed using orthogonal pilot tone
Cease t1、t2、…、tKCorresponding user's set S1、S2、…、SKIn, wherein, natural number user's sequence number K is not more than N；
（3）To step（2）With the remaining users postponed, according to each user UEnTo the large scale of all remote radio heads
Fading information quadratic sum vnNumerical value perform ascending order arrangement, then by the remaining users UE after sequence(N)、UE(N-1)、…、UE(K+1)According to
It is secondary to be arranged in order into user's set corresponding to the minimum pilot frequency information of the mean square error value added of channel estimation errors value；
（4）All users send pilot frequency information to remote radio hair simultaneously according to pilot tone allocation result, each remote radio
Head carries out base station processing unit pond of the information received by fiber optic backhaul Link Feedback to high in the clouds, base station processing unit pond
Channel estimation, obtains all users to the channel condition information of each remote radio head.
Suppressing the innovation advantage of the pilot distribution method of pilot pollution in cloud wireless access network of the present invention is：The present invention is utilized
On the premise of the channel large scale fading information that baseband processing unit pond has learned that beyond the clouds, the pilot tone used each user
Information carries out reasonable distribution, so as to inhibit the pilot pollution caused by orthogonal guide frequency information sequence lazy weight, improves
The precise degrees of cloud wireless access network channel estimation, and and then improve the reliability of transmission.Pilot distribution method of the present invention
It can reach and channel estimation essentially identical by enumerating the optimal pilot distribution technique scheme of acquisition in cloud wireless access network
Performance, still, its computation complexity are substantially reduced；Moreover, the operating procedure of the inventive method is simple, it is easy, convenient to realize, because
This, with good popularizing application prospect.
Brief description of the drawings
Fig. 1 is the network architecture for being applicable the pilot distribution method for suppressing pilot pollution in cloud wireless access network of the present invention
Composition schematic diagram.
Fig. 2 is the pilot distribution method operating procedure flow chart of suppression pilot pollution in cloud wireless access network of the present invention.
Fig. 3 is the signal to noise ratio and letter of the pilot distribution method embodiment of suppression pilot pollution in cloud wireless access network of the present invention
Estimate the curve map of mean square error in road.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, complete, the present invention is made below in conjunction with the accompanying drawings into
The detailed description of one step.And the embodiment of description is the partial content of the present invention, rather than whole embodiments.Based on the present invention
Embodiment, the every other implementation that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Referring to Fig. 1, the network for being applicable the pilot distribution method for suppressing pilot pollution in cloud wireless access network of the present invention is introduced
System architecture composition figure.Pilot distribution method of the present invention is applied to the channel estimation of cloud wireless access network, wherein, cloud wireless access
Net includes M remote radio first 1, and R is designated as respectively1, R2..., RM, each remote radio first 1 and high in the clouds baseband processing unit pond 4
Between be connected by fiber optic backhaul link 3, the cloud wireless access network serves N number of user 2, and UE is designated as respectively1, UE2...,
UEN.Because user 2 to the channel large scale fading information between remote radio first 1 generally depends on the factors such as distance, also as
The change of this kind of factor is all relatively slower, and is readily available, therefore the traditionally large scale of each channel of cloud wireless access network
Fading information is known for high in the clouds baseband processing unit pond.When carrying out channel estimation, using orthogonal pilot frequency sequence t1,
t2..., tK, moreover, number K≤N of orthogonal pilot frequency sequence.
Suppressing the pilot distribution method of pilot pollution in cloud wireless access network of the present invention is：First, according to each user UEn
To the large scale fading information quadratic sum v of all remote radio headsnSize, all N number of users are carried out with descending arrangements, sequence
User afterwards is designated as UE(1), UE(2)..., UE(N), meet v(1)≥v(2)…≥v(N).Then, by UE(1), UE(2)..., UE(K)Point
It is not assigned to using orthogonal pilot frequency information t1, t2..., tKCorresponding user's set S1, S2..., SKIn（N≥K）；It is remaining to use
Family is arranged as UE according to the numerical value ascending order from small to large of large scale fading information quadratic sum(N), UE(N-1)..., UE(K+1)Successively
Distribute into the corresponding user's set of the minimum pilot frequency information of the square mean error amount increase of channel estimation errors.Finally, institute is useful
Pilot frequency information is sent in family to remote radio hair simultaneously according to pilot tone allocation result, and each remote radio head leads to the information received
Fiber optic backhaul Link Feedback is crossed to the base station processing unit pond in high in the clouds, unit cells is handled by the base station and carries out channel estimation, just obtain
Channel condition information of all users to each remote radio head.
Referring to Fig. 2, the following concrete operation step of the inventive method is introduced：
Step 1, according to each user UEnTo the large scale fading information quadratic sum v of all remote radio headsnNumerical value it is big
Small to carry out descending arrangement to N number of whole users altogether, the user after being sorted is：UE(1)、UE(2)、…、UE(n)、…、UE(N), and
Meet v(1)≥v(2)≥…v(n)≥…≥v(N)；Wherein, natural number n is user's sequence number, and its maximum number is N.
The step includes following operation content：Because of user UEnTo remote radio head RmLarge scale fading information be wmn, therefore
User UEnLarge scale fading information quadratic sum to all remote radio heads is：User's sequence after sequence
UE(1)、UE(2)、…、UE(n)、…、UE(N)Be according toNumerical values recited descending arrangement；Wherein, natural number m is to penetrate
Frequency zooms out a sequence number, and its maximum number is M.
Step 2, by the preceding K user UE after descending sort(1)、UE(2)、…、UE(K)It is respectively configured and is led using orthogonal
Frequency information t1、t2、…、tKCorresponding user's set S1、S2、…、SKIn, wherein, natural number user's sequence number K is not more than N.
The step includes following operation content：User UE(k)Added to using k-th of pilot frequency information tkUser's set Sk
Afterwards, user's set SkIt is expressed as Sk={UE(k), wherein, natural number k is user's sequence number after descending sort, is also pilot frequency information
The sequence number that sequence number and the corresponding user using the sequence number pilot frequency information gather, its maximum number is K.
Step 3, the remaining users postponed are matched somebody with somebody for step 2, according to each user UEnTo the big chi of all remote radio heads
Spend fading information quadratic sum vnNumerical value perform ascending order arrangement, then by the remaining users UE after sequence(N)、UE(N-1)、…、UE(K+1)
It is arranged in order successively into user's set corresponding to the minimum pilot frequency information of the mean square error value added of channel estimation errors value.
The step includes following operation content：
（31）Step 2 is matched somebody with somebody to the remaining users UE postponed(i)It is assigned to using pilot frequency information tjUser's set SjIn, so
Value added with the channel estimation mean square error caused by postponing is：
In formula, LjFor user's set SjIn the total number of users that includes,For user's set SjIn q-th of user, i.e. natural number q be user's set SjIn user's sequence number；It is user
To m-th of remote radio head RmLarge scale fading information, σ2For the mean square error of additive white Gaussian noise.
（32）From using pilot frequency information t1,t2,…,tj,…,tKCorresponding user's set S1,S2,…,Sj,…,SKIt is middle to choose it
In cause the minimum user's set of the value added of channel estimation mean square error
（33）Update user's setBy user UE(i)Distributing to the square mean error amount of channel estimation errors increases minimum
Pilot frequency information corresponding user setIn, user's set after renewalFor：Formula
In,For user's set after renewal For user's set before renewal
Step 4, all users send pilot frequency information to remote radio hair simultaneously according to pilot frequency information allocation result, and each is penetrated
Frequency zooms out head by base station processing unit pond of the information received by fiber optic backhaul Link Feedback to high in the clouds, base station processing unit
Pond carries out channel estimation, obtains all users to the channel condition information of each remote radio head.The step includes following operation
Content：
（41）All users are according to above-mentioned steps（1）~（3）Obtained pilot frequency information allocation result, while respectively to each
Remote radio hair send pilot frequency information, the pilot frequency information from each user that each remote radio head is receivedIn formula, all remote radio heads receive mixed information y=[y of the pilot frequency information of each user1,
y2,…,ym,…,yM]T, ymIt is serial number m remote radio head RmThe mixed information of the pilot frequency information of each user received,
Serial number n user UE(n)To the channel fading information h of each remote radio headn=[h1n…hMn]T, hmnFor user UE(n)To penetrating
Frequency zooms out a RmBetween channel channel fading information, t(n)It is the user UE(n)The pilot frequency information of transmission, t(n)∈{t1,…tK,
Z is the reception Gauss additive white noise at remote radio head.
（42）Each remote radio head by the pilot frequency information of each user received by fiber optic backhaul Link Feedback extremely
The base station processing unit pond in high in the clouds, the base station processing unit pond is according to formulaThe pilot tone letter fed back to remote radio head
Breath is detected and estimated, for estimating instantaneous channel state information：For user UE(n)To the channel of each remote radio head
Fading information hn, base station processing unit pond obtains all users to the instantaneous channel state information of each remote radio head；Wherein,For the user UE(n)The pilot frequency information t of transmission(n)Conjugate transposition.
Multi simulation running implementation has been carried out in the pilot distribution method for suppressing pilot pollution in cloud wireless access network of the present invention
Experiment, to verify and assess the performance of this method, and by its with the performance of other pilot distribution methods in cloud wireless access network with
Gain is compared.
Referring to Fig. 3, the pilot distribution method embodiment data for suppressing pilot pollution in cloud wireless access network of the present invention are introduced
Compared result with the channel estimation mean square error of other pilot distribution methods in cloud wireless access network.
The wireless transmission channel of emulation embodiment is modeled as：hmn=wmngmn, wherein, hmnFor user UEnTo remote radio head
RmChannel fading information, gmnFor flat Rayleigh fading channel, large scale fading information wmnModeling Calculation formula be：In formula, dmnFor user UEnTo remote radio head RmDistance, α be the path loss factor, number of users be N=100, penetrate
The sum that frequency zooms out head is M=100, and all users and remote radio head are randomly dispersed in 1000m × 1000m region,
The number of orthogonal pilot frequency sequence is K=80.
Embodiment is by the pilot distribution method and cloud wireless access of suppression pilot pollution in cloud wireless access network of the present invention
The random channel for performing pilot distribution method in optimal pilot distribution method and cloud wireless access network in net by enumerating acquisition
Three kinds of mean square error performances of estimation are compared.In Fig. 3, random pilot divides respectively in cloud wireless access network from top to bottom
In optimal pilot distribution method and cloud wireless access network of the present invention in method of completing the square, cloud wireless access network by enumerating acquisition
Suppress three channel estimation mean square error-signal to noise ratio curves corresponding to the pilot distribution method of pilot pollution, wherein the present invention
Suppress the pilot distribution method of pilot pollution in cloud wireless access network with being led in cloud wireless access network by enumerating the optimal of acquisition
The corresponding channel estimation mean square error-signal to noise ratio curve of frequency division method of completing the square almost overlaps.
Experiment shows, in average signal-to-noise ratio from during 0dB increases to 50dB, suppresses in cloud wireless access network of the present invention
Estimated in the pilot distribution method and cloud wireless access network of pilot pollution by the channel for the optimal pilot distribution method for enumerating acquisition
Mean square error performance is counted, random pilot distribution method in cloud wireless access network is significantly better than, also, two kinds of transmission method performances are bent
Line is essentially coincided, and the result shows：The pilot distribution method for suppressing pilot pollution in cloud wireless access network of the present invention is that cloud is wireless
A kind of optimal pilot distribution method estimated in access network based on orthogonal pilot channels.In addition, with passing through in cloud wireless access network
The optimal pilot distribution method for enumerating acquisition compares, and the present invention suppresses the computation complexity of the pilot distribution method of pilot pollution
Only substantially reduced with number of users and remote radio head quantity into polynomial relation, therefore computation complexity.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, on the premise of the inventive method principle is not departed from, some improvements and modifications can also be made, these improve and moistened
Decorations also should be regarded as protection scope of the present invention.
Claims (5)
1. suppress the pilot distribution method of pilot pollution in a kind of cloud wireless access network, it is characterised in that：Under methods described includes
Row operating procedure：
(1) according to each user UEnTo the large scale fading information quadratic sum v of all remote radio headsnNumerical values recited to common N
Individual whole users carry out descending arrangement, and the user after being sorted is：UE(1)、UE(2)、…、UE(n)、…、UE(N), and meet v(1)
≥v(2)≥…v(n)≥…≥v(N)；Wherein, natural number n is user's sequence number, and its maximum number is N；
(2) by the preceding K user UE after descending sort(1)、UE(2)、…、UE(K)It is respectively configured using orthogonal pilot frequency information t1、
t2、…、tKCorresponding user's set S1、S2、…、SKIn, wherein, natural number user's sequence number K is not more than N；
(3) remaining users postponed are matched somebody with somebody to step (2), according to each user UEnTo the large scale decline letter of all remote radio heads
Cease quadratic sum vnNumerical value perform ascending order arrangement, then by the remaining users UE after sequence(N)、UE(N-1)、…、UE(K+1)Successively sequentially
It is configured in user's set corresponding to the minimum pilot frequency information of the mean square error value added of channel estimation errors value；
(4) all users send pilot frequency information to remote radio hair simultaneously according to pilot tone allocation result, and each remote radio head will
The information received is by the base station processing unit pond of fiber optic backhaul Link Feedback to high in the clouds, and base station processing unit pond carries out channel
Estimation, obtains all users to the channel condition information of each remote radio head.
2. according to the method described in claim 1, it is characterised in that：The step (1) includes following operation content：Because of user UEn
To remote radio head RmLarge scale fading information be wmn, therefore user UEnTo the large scale fading information of all remote radio heads
Quadratic sum is：User's sequence UE after sequence(1)、UE(2)、…、UE(n)、…、UE(N)Be according to's
The arrangement of numerical values recited descending；Wherein, natural number m is remote radio head sequence number, and its maximum number is M.
3. according to the method described in claim 1, it is characterised in that：In the step (2), user UE(k)Added to using
K pilot frequency information tkUser's set SkAfterwards, user's set SkIt is expressed as Sk={ UE(k), wherein, natural number k is descending row
User's sequence number after sequence, is also the sequence number that pilot frequency information sequence number and the corresponding user using the sequence number pilot frequency information gather, its
Maximum number is K.
4. method according to claim 2, it is characterised in that：The step (3) includes following operation content：
(31) step (2) is matched somebody with somebody to the remaining users UE postponed(i)It is assigned to using pilot frequency information tjUser's set SjIn, so match somebody with somebody
The value added of channel estimation mean square error caused by postponing is：In formula, Lj
For user's set SjIn the total number of users that includes,For user's set SjIn q-th of user, i.e. natural number q be user set
SjIn user's sequence number；It is userTo m-th of remote radio head RmLarge scale fading information, σ2For additive white gaussian
The mean square error of noise；
(32) from using pilot frequency information t1,t2,…,tj,…,tKCorresponding user's set S1,S2,…,Sj,…,SKMiddle selection is wherein drawn
Play the minimum user's set of the value added of channel estimation mean square error
(33) user's set is updatedBy user UE(i)Distribute leading to the square mean error amount increase minimum of channel estimation errors
The corresponding user's set of frequency informationIn, user's set after renewalFor：In formula,For user's set after renewal For user's set before renewal
5. according to the method described in claim 1, it is characterised in that：The step (4) includes following operation content：
(41) the pilot frequency information allocation result that all users obtain according to above-mentioned steps (1)~(3), while respectively to each radio frequency
Zoom out hair and send pilot frequency information, the pilot frequency information from each user that each remote radio head is received
In formula, all remote radio heads receive the mixed information y=[y of the pilot frequency information of each user1,y2,…,ym,…,yM]T, ym
It is serial number m remote radio head RmThe mixed information of the pilot frequency information of each user received, serial number n user UE(n)
To the channel fading information h of each remote radio headn=[h1n…hMn]T, hmnFor user UE(n)To remote radio head RmBetween believe
The channel fading information in road, t(n)It is the user UE(n)The pilot frequency information of transmission, t(n)∈{t1,…tK, z is at remote radio head
Reception Gauss additive white noise；
(42) pilot frequency information of each user received is passed through fiber optic backhaul Link Feedback to high in the clouds by each remote radio head
Base station processing unit pond, the base station processing unit pond is according to formulaThe pilot frequency information that remote radio head feeds back is entered
Row detection and estimation, for estimating instantaneous channel state information：For user UE(n)To the channel fading of each remote radio head
Information hn, base station processing unit pond obtains all users to the instantaneous channel state information of each remote radio head；Wherein,For
The user UE(n)The pilot frequency information t of transmission(n)Conjugate transposition.
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