CN103368637A - Signal processing method in multi-point coordination - Google Patents
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Abstract
The invention relates to a signal processing method in multi-point coordination. According to an embodiment of the invention, the signal processing method comprises that each coordination point in a processing set processes signals from user equipment in a distribution mode, and the processing set provides multi-point coordination for the user equipment; and information obtained through distributed processing is sent to a central processing unit in the processing set, and combination processing is carried out by the central processing unit. The signal processing method provided by the invention reduces the complexity in calculation and requirements for backhaul overhead of signal processing in multi-point coordination, and avoids excessive consumption of system resources; and meanwhile, excellent system performance is acquired.
Description
Technical field
The invention relates to the signal processing method in a kind of wireless communication system, particularly about the signal processing method in the wireless communication system of using multipoint cooperative (CoMP, Coordinated Multi-Point).
Background technology
Coordinated multipoint transmission is Long Term Evolution-senior project (LTE-Advanced, Long Term Evolution-Advanced) very promising technology in, it can effectively reduce the interference (ICI of minizone, and improve covering, cell edge throughput and/or the throughput of system of high data rate inter-cell interference).When carrying out the signal processing in the multipoint cooperative situation, two schemes is arranged usually: a kind of is centralized processing, claims again associating least mean-square error (MMSE, Minimum Mean Square Error) or network to advance to have more (network MIMO) more; Another kind is distributed treatment.
Wherein the similar traditional distributing antenna system of centralized processing is processed the information consolidation that receives on all cooperation points.If taking into account system expense and implement complexity not, single with regard to systematic function, the centralized Combined Treatment is a kind of scheme of the best.But in practice, the required huge backhaul expense of Combined Treatment and large-scale matrix computations are non-than ordinary test to the resource of system really.
By contrast, distributed treatment can reduce the complexity of processing and save the backhaul expense, and key is how to make it to obtain and the similar systematic function of centralized processing.(inter-site) Successive Interference Cancellation (SIC between standing, Successive Interference Cancellation) be a kind of distributed treatment, interference user equipment (UE wherein, User Equipment) source data is forwarded to the service point of disturbed subscriber equipment with the reconstruct interference signal, thereby removes this interference signal in the signal that can receive from disturbed subscriber equipment.Yet the robustness of the method (robust) deficiency need to be found out the Modulation and Coding Scheme (MCS, Modulation Coding Scheme) that real interference user equipment and prediction are used for Successive Interference Cancellation between follow-up station.In addition, for real system, non-full traffic carried and cause those business of interference level not high can reduce the benefit of multipoint cooperative.In having the network of long distance between sites, because edge customer equipment to the long distance of service point causes the power of edge customer equipment very little, the gain that multiple spot merges or helpful also wishing obtains.And above-mentioned distributed treatment obviously can't address these problems.
In sum, also lack effective signal processing method for multipoint cooperative at present.For promoting further developing and implementing of multipoint cooperative, industry is needed a kind of low complex degree, low backhaul expense badly and is had the signal processing method of high systematic function concurrently.
Summary of the invention
One object of the present invention is to provide a kind of signal processing method of multipoint cooperative, and it can obtain the better systems performance and needn't carry out complex calculations and consume a large amount of backhaul expenses.
One embodiment of the invention provide a kind of signal processing method, comprise: process each concentrated cooperation point distributed treatment from the signal of subscriber equipment, this processing integrates as subscriber equipment provides multipoint cooperative; Reach transmission and extremely process the center processing unit of concentrating through the information that distributed treatment obtains, merge processing by center processing unit.
In one embodiment, this distributed treatment comprises interference and suppresses processing.In another embodiment, this distributed treatment comprises the local cancellation processing of disturbing.And according to still another embodiment of the invention, each cooperation point of process concentrating is when the signal of channel user equipment is correctly decoded altogether in this locality, just carries out this locality and disturbs and cancel processing.In addition, in one embodiment, merge processing and comprise symbol level merging processing or bit level merging processing.Symbol level merges processing can comprise high specific merging or equal gain combining.Bit level merging is processed and can be comprised soft bit merging.According to one embodiment of the invention, center processing unit can be positioned at the serving BS of subscriber equipment.
The signal processing method that distributed treatment of the present invention and multiple spot merge compared to prior art, has reduced the complexity calculated and to the demand of backhaul expense, has avoided consuming excessively system resource; But obtained simultaneously excellent systematic function.Signal in the multipoint cooperative that solves is processed a difficult problem, and then is conducive to further developing and implementing of multipoint cooperative technology.
Description of drawings
Fig. 1 processes to concentrate a cooperation point according to an embodiment of the invention, and namely the first base station is to from subscriber equipment, and namely the signal of the 3rd subscriber equipment carries out the schematic diagram of distributed treatment;
Fig. 2 processes to concentrate another cooperation point according to an embodiment of the invention, and namely the second base station is to from subscriber equipment, and namely the signal of the 3rd subscriber equipment carries out the schematic diagram of distributed treatment;
Fig. 3 processes to concentrate another cooperation point according to an embodiment of the invention, and namely the 3rd base station is to from subscriber equipment, and namely the signal of the 3rd subscriber equipment carries out the schematic diagram of distributed treatment;
Fig. 4 is the flow chart that the signal of according to an embodiment of the invention multipoint cooperative is processed;
Fig. 5 is that physical layer receives the system configuration schematic diagram that signal is processed according to an embodiment of the invention;
Fig. 6 is that the signal of according to an embodiment of the invention multipoint cooperative is processed the schematic diagram when carrying out the multiple spot merging;
Fig. 7 is when having the ideal communication channel estimation, the average cell spectrum efficient between the unlike signal processing scheme and the simulation result figure of Cell Edge User device throughput; And
Fig. 8 is when adopting actual channel to estimate, the average cell spectrum efficient between the unlike signal processing scheme and the simulation result figure of Cell Edge User device throughput.
Embodiment
Spirit for a better understanding of the present invention is described further it below in conjunction with part preferred embodiment of the present invention.
One embodiment of the invention provide a kind of signal processing method for multipoint cooperative, and the method carries out distributed treatment and multiple spot merges (DIPC, Distributed Processing and Multi-point Combining).This signal processing method comprises: for subscriber equipment provides each cooperation point distributed treatment that the processing of multipoint cooperative concentrates signal from this subscriber equipment; Reach transmission and extremely process the center processing unit of concentrating through the information that distributed treatment obtains, merge processing by center processing unit.According to signal processing method provided by the present invention, each cooperation point of process concentrating can and belong to from its subscriber equipment of serving processes that the non-subscriber equipment of serving of other residential quarter obtains channel information and can carry out preliminary treatment in the collection, then by back haul link these channel informations is shared to center processing unit and does further to merge processing for it.
Below in conjunction with a typical scene in the multipoint cooperative one embodiment of the invention are described in detail.With reference to Fig. 1-3 and 6, in this classics scene, have three residential quarters 11,12,13.Wherein the first residential quarter 11 is by 110 administrations of the first base station; First user equipment 111 is positioned at this first residential quarter 11, and its serving BS is this first base station 110.The second residential quarter 12 is by 120 administrations of the second base station; The second subscriber equipment 121 is positioned at this second residential quarter 12, and its serving BS is this second base station 120.The 3rd residential quarter 13 is by 130 administrations of the 3rd base station; The 3rd subscriber equipment 131 is positioned at the 3rd residential quarter 13, and its serving BS is the 3rd base station 130.The first base station 110, the second base station 120, and the 3rd base station 130 constitutes the processing collection that the 3rd subscriber equipment 131 provides multipoint cooperative.
Fig. 4 is the flow chart when processing the signal of the 3rd subscriber equipment 131 in the multipoint cooperative according to one embodiment of the invention.As shown in Figure 4, at first in step 200, provide each concentrated cooperation point of processing of multipoint cooperative for the 3rd subscriber equipment 131, i.e. the first base station 110, the second base station 120, and the 3rd base station 130 distributed treatment are from the signal of the 3rd subscriber equipment 131, respectively as shown in Figure 1, 2, 3.According to one embodiment of the invention, this distributed treatment can be that local the processing disturbs inhibition (interference suppression) to process.For example, the first base station 110, the second base station 120, and the 3rd base station 130 is independently to the signal from the 3rd subscriber equipment 131
Carry out linear MMSE balanced, wherein,
Be the signal from the 3rd subscriber equipment 131 that receives on i the base station, it is expressed as follows:
Carry out the balanced needed processing weight matrix of linear MMSE as follows:
Wherein C is expressed as the processing set that subscriber equipment provides multipoint cooperative to process, h
ImExpression self-interference user equipment (UE)
m(such as first user equipment 111, the second subscriber equipment 121) is to signal acceptance point BS
i(being the current channel coefficients that independently carries out the cooperation point of signal processing, such as the first base station 110 among Fig. 1, the second base station 120 among Fig. 2, the 3rd base station 130 among Fig. 3).h
InExpression is from user's equipment UE
nThe link of desirable useful signal.
Through disturbing the signal message after suppressing to process as follows:
Shown in Figure 5 is that physical layer receives the system configuration schematic diagram that signal is processed according to an embodiment of the invention.For any cooperation point, the signal of its reception is through removing Cyclic Prefix (CP, Circle Prefix) and fast fourier transform (FFT, Fast Fourier Transform) processor 300 is processed, and its reference signal and data enter respectively channel estimator 301 and MMSE equalizer 302; After MMSE equalizer 302 is processed, process the signal message S that can obtain through disturbing inhibition to process through inverse fast fourier transformed (IFFT, Inverse Fast Fourier Transform) device 303 and demodulator 304 again
nThen signal message can carry out mixed automatic repeat request-affirmation (HARQ again, Hybrid Automatic Repeat Request) a series of processing such as combiner 305, Turbo decoder 306 and cyclic redundancy check (CRC) code (CRC, Cyclic Redundancy Check) checker 307.In other words, before decoding, the signal message through disturb to suppress processing can be transmitted to the serving BS of subscriber equipment, is further processed such as the serving BS 130 of the 3rd subscriber equipment 131.
According to one embodiment of the invention, for providing the distributed treatment of each cooperation point that the processing of multipoint cooperative concentrates, subscriber equipment also can comprise the local cancellation of disturbing, and it can be Successive Interference Cancellation that cancellation is disturbed in this this locality.When multipoint cooperative, local subscriber apparatus (such as the first user equipment 111 among Fig. 1) receives (such as the reception of 110 pairs of the 3rd subscriber equipmenies 131 in the first base station among Fig. 1) to non-service link often very large interference.Carrying out local interference cancellation can make the non-service link reception have better quality.This is that its most of interference can successfully be removed because the probability that the local user is correctly decoded is very high.Carrying out this locality when disturbing the cancellation operation, do not needing to stride that cell channel is estimated and bit is shared, only needing a local reception signal that is total to channel user equipment to be correctly decoded and get final product.As in Fig. 1, the first base station 110 is when carrying out this locality interference cancellation operation to the 3rd subscriber equipment 131, and the signal demand that first user equipment 111 receives is correctly decoded.
Return Fig. 4, in step 201, each cooperation point, i.e. the first base station 110, the second base station 120, and the 3rd base station 130 will all be forwarded to through the signal from the 3rd subscriber equipment 131 of distributed treatment and process the center processing unit of concentrating and merge processing.Common mode is that this center processing unit is arranged on the serving BS, and as shown in Figure 6, namely the first base station 110 in the present embodiment, the second base station 120 are forwarded on the 3rd base station 130 by the signal message of back haul link after with its independent process.Merge to process and to comprise symbol level merging processing or bit level merging processing.It is multiple that symbol level merging processing comprises again high specific merging or equal gain combining etc.Bit level merging is processed and is then comprised modal soft bit (soft-bit) merging.
Fig. 7, Fig. 8 are for showing more intuitively the present invention that advantage of the present invention is carried out and the emulation comparative result between other signal processing scheme.Wherein Fig. 7 is when having the ideal communication channel estimation, average cell spectrum efficient and Cell Edge User device throughput between the unlike signal processing scheme; And Fig. 8 is when adopting actual channel to estimate, average cell spectrum efficient and Cell Edge User device throughput between the unlike signal processing scheme.
Concrete, two embodiment DIPC of the present invention in Fig. 7 (not comprising the local cancellation processing of disturbing) and DIPC-SIC (comprising the local cancellation processing of disturbing) and Combined Treatment (JP, Joint Processing; Be centralized processing) all process more single residential quarter that obvious gain is arranged; And Combined Treatment has better spectrum efficiency and cell edge throughput than DIPC, but can't compare with DIPC-SIC.And select thresholding to allow more subscriber equipment to participate in multipoint cooperative in case discharge coordinated regions, although only have approximately 10% not obvious gain of 10dB to 30dB, spectrum efficiency and cell edge throughput all can improve.
Among Fig. 8, exist in the channel estimation errors situation, DIPC also comparable Combined Treatment has better spectrum efficiency and cell edge throughput, says nothing of DIPC-SIC.In other words, Combined Treatment is more responsive to real channel estimation errors than the present invention, can't obtain excellent properties of the present invention in the practical application.
In sum, the signal processing mode that distributed treatment of the present invention and multiple spot merge need not complicated matrix operation and a large amount of backhaul expenses and can obtain excellent systematic function, has well solved the signal processing problems in the multipoint cooperative.
It is to be noted, because the development of technology and the renewal of standard, parts with identical function often have a plurality of different addresses, the LTE that is in the development is all the more so, such as station (site), point (point), base station (base station), evolved node base station (eNB, evolved Node Base) etc. namely often by Alternate.Employed technical term is for explanation and demonstrates technical scheme of the present invention in the application for patent of the present invention, and Ying Yiqi is as the criterion in the function of knowing together in the art, and can not only understand arbitrarily with the similarities and differences of title.
Technology contents of the present invention and technical characterstic disclose as above, yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by present patent application claims.
Claims (8)
1. signal processing method comprises:
Process each concentrated cooperation point distributed treatment from the signal of subscriber equipment, described processing collection provides multipoint cooperative for described subscriber equipment; And
The center processing unit that the signal message that transmission obtains through described distributed treatment is concentrated to described processing merges processing by described center processing unit.
2. signal processing method as claimed in claim 1, wherein said distributed treatment comprise to disturb and suppress to process.
3. signal processing method as claimed in claim 1, wherein said distributed treatment comprise and locally disturb cancellation to process.
4. signal processing method as claimed in claim 3, each cooperation point that wherein said processing is concentrated just carry out the described local cancellation processing of disturbing when the signal of channel user equipment is correctly decoded altogether in this locality.
5. signal processing method as claimed in claim 1, wherein said merging are processed and are comprised symbol level and merge and process or bit level merging is processed.
6. signal processing method as claimed in claim 5, wherein said symbol level merge to process and comprise high specific and merge or equal gain combining.
7. signal processing method as claimed in claim 5, wherein said bit level merging are processed and are comprised soft bit and merge.
8. signal processing method as claimed in claim 1, wherein said center processing unit is positioned at the serving BS of described subscriber equipment.
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| WO2015168856A1 (en) * | 2014-05-06 | 2015-11-12 | 华为技术有限公司 | Multiflow transmission method and device |
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| CN101834702A (en) * | 2009-03-12 | 2010-09-15 | 夏普株式会社 | Channel reconstruction method, base station and user equipment |
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Application publication date: 20131023 |