CN102377465B - Downstream wave beam shaping method and apparatus thereof - Google Patents
Downstream wave beam shaping method and apparatus thereof Download PDFInfo
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- CN102377465B CN102377465B CN201010249759.5A CN201010249759A CN102377465B CN 102377465 B CN102377465 B CN 102377465B CN 201010249759 A CN201010249759 A CN 201010249759A CN 102377465 B CN102377465 B CN 102377465B
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Abstract
The invention provides a downstream wave beam shaping method and an apparatus thereof. The method comprises the following steps that: a weight of an average spatial covariance matrix of a previous subframe of an uplink wave beam corresponded to a to-be-shaped downstream wave beam is obtained and stored; the average spatial covariance matrix of the previous subframe is reconstructed according to the weight of the average spatial covariance matrix of the previous subframe; smooth filtering processing is carried out on the average spatial covariance matrix of the previous subframe and an instantaneous spatial covariance matrix of a current subframe of the uplink weave beam so as to obtain a current subframe average spatial covariance matrix; and according to a weight of the current subframe average spatial covariance matrix, wave beam shaping is carried out on the downstream wave beam. According to the invention, a block error rate performance is improved; and an occupied storage content during the operation process is reduced.
Description
Technical field
The present invention relates to a kind of down beam shaping method and device, belong to 3G (Third Generation) Moblie field.
Background technology
The basic principle of wave beam forming technology is by changing the weight of each antenna element, in space, form directional antenna beam, main beam is to desired user equipment (User Equipment, be called for short: signal UE) is followed the tracks of, and disturbing UE direction to form zero falling into, so just greatly reduce the interference of system, improved frequency efficiency.
Existing TD SDMA (Time Division-Synchronous Code Division Multiple Access, be called for short: TD-SCDMA) in communication system, need applying intelligent antenna technology, this smart antenna can produce a plurality of wave beams simultaneously, according to the distribution of communication terminal, in the scope of 360 degree, realize down beam shaping.
Prior art is directly carried out figuration calculating with the instantaneous space covariance matrix of current subframe, but need to improve at Block Error Rate aspect of performance.In addition, first prior art will calculate the instantaneous space covariance matrix of the current subframe of uplink beam when carrying out down beam shaping, then be normalized and adaptive smooth is processed, in the hope of the mean value of the space covariance matrix of current subframe, be used for calculating figuration vector.In prior art when the mean value of computer memory covariance matrix, the mean value that needs the space covariance matrix of the upper subframe of reservation, and to do recurrence average with the instantaneous value of the space covariance matrix of current subframe, obtains the mean value of the space covariance matrix of current subframe.Visible, this method need to be stored the mean value of the space covariance matrix of a subframe, therefore need to take larger memory space.
Summary of the invention
The invention provides a kind of down beam shaping method and device, in order to improve Block Error Rate performance and to reduce the memory space taking in calculating process.
One aspect of the present invention provides a kind of down beam shaping method, comprising:
Obtain and preserve the weights of a upper subframe mean space covariance matrix of the uplink beam corresponding with the downlink wave beam for the treatment of figuration;
According to a upper subframe mean space covariance matrix described in the weight value reconstruction of a described upper subframe mean space covariance matrix, according to formula
a upper subframe mean space covariance matrix described in reconstruct
wherein, w represents the weights of a described upper subframe mean space covariance matrix;
The current subframe instantaneous space covariance matrix of a described upper subframe mean space covariance matrix and described uplink beam is carried out to the disposal of gentle filter and obtain current subframe mean space covariance matrix;
According to the weights of described current subframe mean space covariance matrix, described downlink wave beam is carried out to wave beam forming.
The present invention provides a kind of down beam shaping device on the other hand, comprising:
Acquisition module, for obtaining and preserve the weights of a upper subframe mean space covariance matrix of the uplink beam corresponding with the downlink wave beam for the treatment of figuration;
Reconstructed module, for a upper subframe mean space covariance matrix described in the weight value reconstruction of the described upper subframe mean space covariance matrix that obtains and preserve according to acquisition module, according to formula
a upper subframe mean space covariance matrix described in reconstruct
wherein, w represents the weights of a described upper subframe mean space covariance matrix;
Level and smooth module, obtains current subframe mean space covariance matrix for the current subframe instantaneous space covariance matrix of a described upper subframe mean space covariance matrix of reconstructed module generation and described uplink beam is carried out to the disposal of gentle filter;
Figuration module, for carrying out wave beam forming according to the weights of the described current subframe mean space covariance matrix that smoothly module obtains to described downlink wave beam.
The present invention is by a upper subframe mean space covariance matrix described in the weight value reconstruction of a upper subframe mean space covariance matrix of preservation uplink beam, and no longer store a upper subframe mean space covariance matrix, therefore reduced the memory space taking in calculating process; In addition, by adopting the current subframe mean space covariance matrix after the disposal of gentle filter to carry out down beam shaping, directly carry out the mode of down beam shaping with the current subframe instantaneous space of available technology adopting covariance matrix and compare, there is more excellent Block Error Rate performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of down beam shaping method embodiment mono-of the present invention;
Fig. 2 is the flow chart of down beam shaping method embodiment bis-of the present invention;
Fig. 3 is the performance simulation correlation curve figure under TU3 channel condition;
Fig. 4 is the performance simulation correlation curve figure under TU50 channel condition;
Fig. 5 is the performance simulation correlation curve figure under RA120 channel condition;
Fig. 6 is the structural representation of down beam shaping device embodiment mono-of the present invention;
Fig. 7 is the structural representation of down beam shaping device embodiment bis-of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of down beam shaping method embodiment mono-of the present invention, and as shown in the figure, the method comprises the steps:
Wherein, a described upper subframe is for current subframe, and because TD-SCDMA communication system adopts Time division duplex, the information that had therefore both comprised uplink beam in a subframe also comprises the information of downlink wave beam.To the figuration of downlink wave beam, based on up-downgoing channel symmetry principle, the information based on uplink beam is implemented.Because a upper subframe is the subframe that receiver had been processed, the weights that therefore obtain its mean space covariance matrix are completely possible.
Particularly, can be according to formula
a upper subframe mean space covariance matrix described in reconstruct
wherein, w represents the weights of a described upper subframe mean space covariance matrix, and conj () represents to carry out conjugate operation, ()
trepresent to carry out transposition computing.
Particularly, can be according to formula
carry out described the disposal of gentle filter, obtain described current subframe mean space covariance matrix
wherein,
represent a described upper subframe mean space covariance matrix,
represent described current subframe instantaneous space covariance matrix, K represents the recurrence factor
Described in the present embodiment, method is by a upper subframe mean space covariance matrix described in the weight value reconstruction of a upper subframe mean space covariance matrix of preservation uplink beam, and no longer store a upper subframe mean space covariance matrix, therefore reduced the memory space taking in calculating process.
In addition, the current subframe mean space covariance matrix of employing after the disposal of gentle filter carries out down beam shaping, directly carry out the mode of down beam shaping with the current subframe instantaneous space of available technology adopting covariance matrix and compare, there is more excellent Block Error Rate performance.
Fig. 2 is the flow chart of down beam shaping method embodiment bis-of the present invention, and as shown in the figure, the method comprises the steps:
Wherein, about the explanation of a upper subframe, can, referring to the related content of said method embodiment mono-, repeat no more herein.
Concrete computing formula can, referring to the related content of said method embodiment mono-, repeat no more herein.
Particularly, can be according to formula
carry out described normalized, obtain a described upper subframe mean space normalized covariance matrix
wherein,
represent a described upper subframe mean space covariance matrix, trace () represents the mark of compute matrix, i.e. diagonal entry sum.
Particularly, can be according to formula
carry out described the disposal of gentle filter, obtain described current subframe mean space covariance matrix
wherein,
represent a described upper subframe mean space covariance matrix,
represent described current subframe instantaneous space covariance matrix, K represents the recurrence factor.
The upper subframe mean space covariance matrix that described in the present embodiment, method obtains after to reconstruct has further carried out normalized, makes the average normalization space covariance matrix of current subframe finally obtaining for downlink wave beam, to carry out wave beam forming more accurately.
By concrete experimental result, effect of the present invention is described below.Fig. 3～Fig. 5 is the performance simulation correlation curve figure under different channels condition.Wherein, (Typical Urban, is called for short: TU), TU channel canonical parameter can be referring to table 1 for typical city for Fig. 3 and Fig. 4; For suburb, (Rural Area is called for short: RA) environment, RA channel canonical parameter can be referring to table 2 Fig. 5.
The list of table 1 TU channel canonical parameter
(Topped DelavLine is called for short: TDL) canonical parameter the delay line of table 2 RA channel
Fig. 3 is the performance simulation correlation curve figure under TU3 channel condition.Wherein, TU3 is illustrated in the speed with 3km/h in TU environment and moves, and in figure, transverse axis represents to send carrier/interface ratio (Tx C/I), and the longitudinal axis represents that (Block Error Ratio is called for short: BLER) Block Error Rate.As shown in the figure, adopt and to carry out the current subframe mean space covariance matrix that obtains after the disposal of gentle filter described in various embodiments of the present invention
the performance that performance while carrying out down beam shaping is better than the current subframe instantaneous space of available technology adopting covariance matrix while carrying out down beam shaping.
Fig. 4 is the performance simulation correlation curve figure under TU50 channel condition.Wherein, TU50 is illustrated in the speed with 50km/h in TU environment and moves.As shown in the figure, adopt and to carry out the current subframe mean space covariance matrix that obtains after the disposal of gentle filter described in various embodiments of the present invention
the performance that performance while carrying out down beam shaping is better than the current subframe instantaneous space of available technology adopting covariance matrix while carrying out down beam shaping.
Fig. 5 is the performance simulation correlation curve figure under RA120 channel condition.Wherein, RA120 is illustrated in the speed with 120km/h in RA environment and moves.As shown in the figure, adopt and to carry out the current subframe mean space covariance matrix that obtains after the disposal of gentle filter described in various embodiments of the present invention
the performance that performance while carrying out down beam shaping is better than the current subframe instantaneous space of available technology adopting covariance matrix while carrying out down beam shaping.
Table 3 has shown BLER=10
-2time emulated data result
As can be seen from Table 3, after employing the present invention, can under TU50 and RA120 channel condition, bring the very large lifting on the down-link performance that downlink wave beam is corresponding.
Fig. 6 is the structural representation of down beam shaping device embodiment mono-of the present invention, and as shown in the figure, this down beam shaping device 10 comprises: acquisition module 11, reconstructed module 12, level and smooth module 13 and figuration module 14, and its operation principle is as follows:
The acquisition module 11 of down beam shaping device 10 obtains and preserves the weights of a upper subframe mean space covariance matrix of the uplink beam corresponding with the downlink wave beam for the treatment of figuration, wherein there is the related description of shutting a subframe, can, referring to the related content of said method embodiment, repeat no more herein; After this, a upper subframe mean space covariance matrix described in the weight value reconstruction of a described upper subframe mean space covariance matrix that obtains and preserve according to acquisition module 11 by reconstructed module 12, wherein, formula used during reconstruct can, referring to the related content of said method embodiment, repeat no more herein; After this, the described upper subframe mean space covariance matrix being generated by 13 pairs of reconstructed module of level and smooth module 12 and the current subframe instantaneous space covariance matrix of described uplink beam carry out the disposal of gentle filter and obtain current subframe mean space covariance matrix, wherein, formula used while carrying out smothing filtering can, referring to the related content of said method embodiment, repeat no more herein; The weights of the described current subframe mean space covariance matrix finally, being obtained according to level and smooth module 13 by figuration module 14 carry out wave beam forming to described downlink wave beam.
Described in the present embodiment, device is by a upper subframe mean space covariance matrix described in the weight value reconstruction of a upper subframe mean space covariance matrix of preservation uplink beam, and no longer store a upper subframe mean space covariance matrix, therefore reduced the memory space taking in calculating process.
In addition, the current subframe mean space covariance matrix of employing after the disposal of gentle filter carries out down beam shaping, directly carry out the mode of down beam shaping with the current subframe instantaneous space of available technology adopting covariance matrix and compare, there is more excellent Block Error Rate performance.
Fig. 7 is the structural representation of down beam shaping device embodiment bis-of the present invention, and as shown in the figure, on the basis of Fig. 6 shown device, down beam shaping device 10 can also enter one and comprises normalization module 15 described in the present embodiment, and its operation principle is as follows.
After a upper subframe mean space covariance matrix described in above-mentioned reconstructed module 12 reconstruct, by the described upper subframe mean space covariance matrix obtaining after 15 pairs of reconstruct of normalization module, be normalized, obtain a subframe mean space normalized covariance matrix, wherein, formula used while being normalized can, referring to the related content of said method embodiment, repeat no more herein; Then, the average normalization space covariance matrix of a described upper subframe obtaining after being normalized by 13 pairs of normalization modules 15 of level and smooth module and the current subframe instantaneous space covariance matrix of described uplink beam carry out the disposal of gentle filter and obtain current subframe mean space covariance matrix, wherein, formula used while carrying out smothing filtering can, referring to the related content of said method embodiment, repeat no more herein; The weights of the described current subframe mean space covariance matrix finally, being obtained according to level and smooth module 13 by figuration module 14 carry out wave beam forming to described downlink wave beam.
Described in the present embodiment, device has further carried out normalized to the upper subframe mean space covariance matrix obtaining after reconstruct, makes the average normalization space covariance matrix of current subframe finally obtaining for downlink wave beam, to carry out wave beam forming more accurately.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a down beam shaping method, is characterized in that comprising:
Obtain and preserve the weights of a upper subframe mean space covariance matrix of the uplink beam corresponding with the downlink wave beam for the treatment of figuration;
According to a upper subframe mean space covariance matrix described in the weight value reconstruction of a described upper subframe mean space covariance matrix, according to formula
a upper subframe mean space covariance matrix described in reconstruct
wherein, w represents the weights of a described upper subframe mean space covariance matrix;
The current subframe instantaneous space covariance matrix of a described upper subframe mean space covariance matrix and described uplink beam is carried out to the disposal of gentle filter and obtain current subframe mean space covariance matrix;
According to the weights of described current subframe mean space covariance matrix, described downlink wave beam is carried out to wave beam forming.
2. down beam shaping method according to claim 1, is characterized in that the described current subframe instantaneous space covariance matrix to a described upper subframe mean space covariance matrix and described uplink beam carries out the disposal of gentle filter and obtains current subframe mean space covariance matrix and comprise: according to formula
carry out described the disposal of gentle filter, obtain described current subframe mean space covariance matrix
wherein,
represent a described upper subframe mean space covariance matrix,
represent described current subframe instantaneous space covariance matrix, K represents the recurrence factor.
3. down beam shaping method according to claim 1, it is characterized in that after a upper subframe mean space covariance matrix, also comprising described in reconstruct: the described upper subframe mean space covariance matrix obtaining after reconstruct is normalized, obtains a subframe mean space normalized covariance matrix.
4. down beam shaping method according to claim 3, is characterized in that the described upper subframe mean space covariance matrix to obtaining after reconstruct is normalized, and obtains a subframe mean space normalized covariance matrix and comprises: according to formula
carry out described normalized, obtain a described upper subframe mean space normalized covariance matrix
wherein,
represent a described upper subframe mean space covariance matrix, trace () represents the mark of compute matrix.
5. according to the down beam shaping method described in claim 3 or 4, it is characterized in that the current subframe instantaneous space covariance matrix of a described upper subframe mean space covariance matrix and described uplink beam is carried out to the disposal of gentle filter to be comprised: the current subframe instantaneous space covariance matrix to a described upper subframe mean space normalized covariance matrix and described uplink beam carries out the disposal of gentle filter.
6. a down beam shaping device, is characterized in that comprising:
Acquisition module, for obtaining and preserve the weights of a upper subframe mean space covariance matrix of the uplink beam corresponding with the downlink wave beam for the treatment of figuration;
Reconstructed module, for a upper subframe mean space covariance matrix described in the weight value reconstruction of the described upper subframe mean space covariance matrix that obtains and preserve according to acquisition module, according to formula
a upper subframe mean space covariance matrix described in reconstruct
wherein, w represents the weights of a described upper subframe mean space covariance matrix;
Level and smooth module, obtains current subframe mean space covariance matrix for the current subframe instantaneous space covariance matrix of a described upper subframe mean space covariance matrix of reconstructed module generation and described uplink beam is carried out to the disposal of gentle filter;
Figuration module, for carrying out wave beam forming according to the weights of the described current subframe mean space covariance matrix that smoothly module obtains to described downlink wave beam.
7. device according to claim 6, characterized by further comprising: normalization module, for the described upper subframe mean space covariance matrix obtaining after to reconstruct after a upper subframe mean space covariance matrix described in reconstructed module reconstruct, be normalized, obtain a subframe mean space normalized covariance matrix.
8. device according to claim 7, it is characterized in that described level and smooth module also carries out the disposal of gentle filter for the average normalization space covariance matrix of a described upper subframe that obtains after normalization module is normalized and the current subframe instantaneous space covariance matrix of described uplink beam, obtain current subframe mean space covariance matrix.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606058B1 (en) * | 1999-03-26 | 2003-08-12 | Nokia Networks Oy | Beamforming method and device |
| CN101005302A (en) * | 2006-01-18 | 2007-07-25 | 上海原动力通信科技有限公司 | Down beam shaping method for limiting interference in time slot CDMA system |
| CN101459457A (en) * | 2007-12-12 | 2009-06-17 | 鼎桥通信技术有限公司 | Wave beam shaping method |
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| CN100512052C (en) * | 2005-04-28 | 2009-07-08 | 上海原动力通信科技有限公司 | Beam shaping method for inhibiting interferes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606058B1 (en) * | 1999-03-26 | 2003-08-12 | Nokia Networks Oy | Beamforming method and device |
| CN101005302A (en) * | 2006-01-18 | 2007-07-25 | 上海原动力通信科技有限公司 | Down beam shaping method for limiting interference in time slot CDMA system |
| CN101459457A (en) * | 2007-12-12 | 2009-06-17 | 鼎桥通信技术有限公司 | Wave beam shaping method |
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