CN102263585A - Method for downstream signal forming, apparatus thereof and system thereof - Google Patents
Method for downstream signal forming, apparatus thereof and system thereof Download PDFInfo
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- CN102263585A CN102263585A CN2010101863823A CN201010186382A CN102263585A CN 102263585 A CN102263585 A CN 102263585A CN 2010101863823 A CN2010101863823 A CN 2010101863823A CN 201010186382 A CN201010186382 A CN 201010186382A CN 102263585 A CN102263585 A CN 102263585A
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- weight vector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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Abstract
The invention discloses a method for downstream signal forming, an apparatus thereof and a system thereof in order to raise a system resource utilization rate and work efficiency. The method comprises the following steps: carrying out channel estimation according to an upstream signal of a user terminal, and obtaining a channel estimated value; according to the channel estimated value, determining a downstream forming weight vector to the user terminal; carrying out a normalization processing on the downstream forming weight vector and obtaining a downstream forming weight vector after the normalization processing; employing the downstream forming weight vector after the normalization processing to carry out downstream signal forming to the user terminal. Thus storage space occupied by storing the downstream forming weight vector is saved, a multiplication operation of downstream forming is saved, space resource and time resource occupied by downstream signal forming is optimized, and the system resource utilization rate and the work efficiency are improved. The invention discloses a downstream signal forming apparatus and a downstream signal forming system simultaneously.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method, Apparatus and system at the downstream signal figuration.
Background technology
In wireless communication technology, baseband subsystems utilizes downstream signal figuration system, generate the weights of one group of conditioning signal phase place for each user terminal, adjust direction and power by the weights figuration at the downstream signal of this user terminal, strengthen to aim at the signal transmission power on the main lobe direction of this user terminal, weaken other user terminals are caused signal transmission power on the secondary lobe direction of interference, thereby improve signal transfer quality, suppress to disturb, improve the covering and the capacity of base station.
Referring to accompanying drawing 1, downstream signal figuration system is generally many antennas weights figuration mode at the implementation of downstream signal figuration.
Referring to accompanying drawing 2, downstream signal figuration system realizes that at downstream signal the detailed process of weights figuration is as follows:
Step 210: the base station receives the upward signal of user terminal.
Wherein, this upward signal can be special training sequence, also can be arbitrary signal.
Step 220: channel estimating is carried out according to the upward signal of this user terminal that receives in the base station, calculates channel estimation value.
Step 230: the base station utilizes above-mentioned channel estimation value, determines the downlink forming weight vector at this user terminal, and the downlink forming weights in this downlink forming weight vector are corresponding one by one with antenna, and preserve this downlink forming weight vector.
Wherein,, just need the base station that these downlink forming weight vectors are stored, refresh the downlink forming weight vector of storage over time again because be uncertain the opportunity that the downlink forming weight vector uses.
The downlink forming weights storage organization of base station is referring to accompanying drawing 3, the antenna number of supposing the base station is N, the user terminal number is M, if single-carrier system, then the downlink forming weights number that need preserve at the downlink forming weight vector of each user terminal is N, for M user terminal, the downlink forming weights number that needs to preserve is M * N, if multicarrier system, suppose that the carrier wave number is S, then the downlink forming weights number that need preserve at the downlink forming weight vector of each user terminal is N * S, and for M user terminal, the downlink forming weights number that needs to preserve is M * N * S.
Step 240: referring to accompanying drawing 4, figuration is carried out to the downstream signal of this user terminal in the base station, is characterized by the base station signal that will launch on the every antenna all be multiply by downlink forming weights that should antenna.
Step 250: referring to accompanying drawing 4, the signal of base station after with above-mentioned downlink forming is transmitted to this user terminal.
In sum, because each base station all can have a large amount of user terminals to insert, in figuration implementation procedure at downstream signal, the downlink forming weight vector that needs all user terminals of the current access of storage, so just need take a large amount of memory spaces, simultaneously, when carrying out the downstream signal figuration at this user terminal, also need the data of launching on the every antenna all be multiply by on this antenna and the corresponding downlink forming weights of this user terminal, and then the data after the transmission processing, so just have in the computing of a large amount of time loss when figuration again, wasted system resource, reduced the operating efficiency of system.
Summary of the invention
The invention provides a kind of method at the downstream signal figuration, Apparatus and system, during in order to optimization downstream signal figuration, shared space resources and time resource improve the resource utilization of system and the operating efficiency of system.
The concrete technical scheme that the embodiment of the invention provides is as follows:
A kind of downstream signal shaping method comprises:
Upward signal according to the user terminal that receives carries out channel estimating, obtains channel estimation value;
According to described channel estimation value, determine downlink forming weight vector at described user terminal;
Described downlink forming weight vector is made normalized, obtain the downlink forming weight vector after the normalized;
Adopt the downlink forming weight vector after the described normalized that described user terminal is carried out the downstream signal figuration.
A kind of downstream signal size enlargement apparatus comprises:
First processing unit is used for carrying out channel estimating according to the upward signal of the user terminal that receives, and obtains channel estimation value;
Second processing unit is used for according to described channel estimation value, determines the downlink forming weight vector at described user terminal;
The 3rd processing unit is used for described downlink forming weight vector is made normalized, obtains the downlink forming weight vector after the normalized;
Manages the unit everywhere, is used to adopt the downlink forming weight vector after the described normalized to carry out the downstream signal figuration at described user terminal.
A kind of downstream signal figuration system comprises:
User terminal is used for sending upward signal to network side;
The downstream signal size enlargement apparatus, be used for carrying out channel estimating according to the upward signal of the user terminal that receives, obtain channel estimation value, according to channel estimation value, determine the downlink forming weight vector, and described downlink forming weight vector made normalized, adopt the downlink forming weight vector after the normalized to carry out the downstream signal figuration at described user terminal.
Based on technique scheme, in the embodiment of the invention, downlink forming weight vector during at the user terminal downlink forming carries out normalized, saved and preserved the shared memory space of downlink forming weight vector, shared space resources when having optimized downlink forming, simultaneously, multiplying amount when having reduced downlink forming, shared time resource when having optimized downlink forming, in sum, the embodiment of the invention, shared space resources and time resource when having optimized the downstream signal figuration, save the resource of system effectively, improved the operating efficiency of usage factor of system resource and system.
Description of drawings
Fig. 1 is existing downstream signal figuration system communication model;
Fig. 2 is the flow chart of existing base station down figuration;
Fig. 3 is existing base station down shape-endowing weight value storage node composition;
Fig. 4 is existing base station down figuration schematic diagram;
Fig. 5 A is the downstream signal figuration system architecture diagram of the embodiment of the invention;
Fig. 5 B is the downstream signal size enlargement apparatus structure chart of the embodiment of the invention;
Fig. 6 A is the flow chart of the base station down figuration of the embodiment of the invention;
Fig. 6 B is the normalized flow chart of downlink forming weights of the embodiment of the invention;
Fig. 7 is the base station down figuration schematic diagram of the embodiment of the invention;
Fig. 8 is the base station down shape-endowing weight value storage node composition of the embodiment of the invention.
Embodiment
Shared space resources and time resource when optimizing the downstream signal figuration, improve the operating efficiency of usage factor of system resource and system, in the embodiment of the invention, by the pairing downlink forming weights of given antenna are carried out normalized, save the memory space resource that downlink forming takies, simultaneously, save the shared time resource of downlink forming.
For realizing technique scheme, at first need to introduce in the embodiment of the invention, carry out the principle of normalized at the employed downlink forming weights of downlink forming.
The antenna number of supposing the base station is N, and the signal that user terminal need be launched is s, and channel estimating is carried out at the upward signal of this user terminal in the base station, and the downlink forming weight vector that calculates is (h
0, h
1, h
2... h
N), the corresponding downstream channel is H
0, H
1, H
2... H
N, so, the downstream signal that this user terminal receives is expressed as S=s (h
0H
0+ h
1H
1+ h
2H
2... h
NH
N), the received power of this user terminal is || S||
2
If each the downlink forming weights in the above-mentioned downlink forming weight vector all be multiply by identical coefficient x, the signal that so described user terminal receives is S * x, and the received power of described user terminal is || S||
2x
2
Because above-mentioned downlink forming weight vector be multiply by identical coefficient x, cause the signal transmission power on each antenna that variation has taken place, but, signal transmission power on each antenna, shared ratio in total emission power, before and after multiplying factor, do not change, the ratio of the signal transmission power between each antenna, before and after multiplying factor, do not change yet, so, through after the gross power control,, before and after multiplying factor, can not change at the direction of the downstream signal of user terminal and the size of power yet.
At permanent mould weights in particular cases, so-called permanent mould weights are characterized by, coefficient x and weights h
0, h
1, h
2... h
NMould all be 1, then before and after multiplying factor, the size of signal transmission power is without any variation on each antenna, and the ratio of the signal transmission power between each antenna is also without any variation, at the direction of the downstream signal of user terminal and the size of power, before and after multiplying factor, can not change yet.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Fig. 5 A, in the embodiment of the invention, the downlink forming system mainly comprises user terminal 50 and downlink forming device 51, wherein,
User terminal 50 is used for sending upward signal to network side;
Downstream signal size enlargement apparatus 51, be used for carrying out channel estimating according to the upward signal of the user terminal 50 that receives, obtain channel estimation value, according to channel estimation value, determine the downlink forming weight vector, and described downlink forming weight vector made normalized, adopt the downlink forming weight vector after the normalized to carry out the downstream signal figuration at user terminal 50.
Consult Fig. 5 B, in the embodiment of the invention, downlink forming device 51 mainly comprises following processing unit:
First processing unit 510 is used for carrying out channel estimating according to the upward signal of the user terminal that receives, and obtains channel estimation value;
Second processing unit 511 is used for according to described channel estimation value, determines the downlink forming weight vector at described user terminal;
The 3rd processing unit 512 is used for described downlink forming weight vector is made normalized, obtains the downlink forming weight vector after the normalized;
Manages unit 513 everywhere, is used to adopt the downlink forming weight vector after the described normalized to carry out the downstream signal figuration at described user terminal, obtains the downstream signal behind the figuration.
Wherein, described the 3rd processing unit 512 comprises:
Normalization coefficient computing unit 5120 is used at described user terminal, extracts from the downlink forming weight vector and the corresponding downlink forming weights of given antenna, and the downlink forming weights according to described given antenna calculate normalization coefficient;
Downlink forming weight calculation unit 5121 is used for according to described normalization coefficient, the downlink forming weight vector after the calculating normalized;
Memory cell 5122 is used to preserve the downlink forming weight vector after this normalized.
Based on above-mentioned principle, to consult shown in Fig. 6 A, in the embodiment of the invention, the base station is as follows at the detailed process of the downstream signal figuration of user terminal:
Step 610: the base station receives the upward signal from user terminal, wherein, this upward signal can be special training sequence, it also can be the burst of the analysable arbitrary form of receiving terminal, so-called training sequence is meant transmitting terminal and the common agreement of receiving terminal, the burst that receiving terminal is known.
Step 620: the base station utilizes the upward signal that receives to carry out channel estimating, calculates channel estimation value.
Step 630: the downlink forming weight vector at described user terminal is determined according to above-mentioned channel estimation value in the base station, and downlink forming weights and antenna in this downlink forming weight vector are to concern one to one.
For example, the antenna number of base station is 3, and the down channel of every antenna should be H mutually
0, H
1, H
2, the upward signal according to certain user terminal that receives calculates channel estimation value, and the downlink forming weights can be the conjugation of channel estimation value, and the downlink forming weight vector that obtains is (h
0, h
1, h
2), then the down channel of antenna 0 correspondence is H
0, corresponding downlink forming weights are h
0, the down channel of antenna 1 correspondence is H
1, corresponding downlink forming weights are h
1, the down channel of antenna 2 correspondences is H
2, corresponding downlink forming weights are h
2
Step 640: normalized is carried out to above-mentioned downlink forming weight vector in the base station, obtains the downlink forming weight vector after the normalized.
Wherein, when carrying out normalized, all be to make that the coefficient after the pairing normalized of given antenna is 1, this given antenna is characterized by, for all user terminals, when downlink forming weights normalized, all be to make that the coefficient after the pairing normalized of this given antenna is 1.
For example, the downlink forming weight vector is (h
0, h
1, h
2), given antenna is an antenna 1, the downlink forming weight vector after the normalized is (h
0/ h
1, 1, h
2/ h
1).
Step 650: the base station utilizes the downlink forming weight vector after the above-mentioned normalized, carry out the downstream signal figuration at this user terminal, comprise: the signal of base station launching on the non-given antenna, all multiply by the downlink forming weights after the corresponding normalized, obtain the downstream signal behind the figuration.
Wherein, consult Fig. 7, because the downlink forming weights after the pairing normalization of above-mentioned given antenna are 1, the base station is when downlink forming, can omit the downlink forming of this given antenna, being characterized by does not need to be the downlink forming weights of the signal times on this given antenna after with normalization.
For example, at the upward signal of certain user terminal, the downlink forming weight vector after the normalized that calculates is (h
0/ h
1, 1, h
2/ h
1), when downlink forming, on the antenna 0 to signal times that should user terminal with h
0/ h
1, on the antenna 2 to signal times that should user terminal with h
2/ h
1, and on the antenna 1 to signal that should user terminal, omit the computing of multiply by downlink forming weights 1.
Step 660: the base station is by antenna, and emission needle is to the later signal of process downlink forming of this user terminal.
Wherein, shown in Fig. 6 B, it is as follows in step 640 the downlink forming weight vector to be carried out the detailed process of normalized:
Step 6401: the base station extracts corresponding with given antenna, at the downlink forming weights in the downlink forming weight vector of described user terminal.
Described given antenna is characterized by, and the base station is at all user terminals, and the normalized of the downlink forming weight vector of being done all is to extract the pairing downlink forming weights of this given antenna.
Step 6402: the base station is according to pairing with this given antenna, downlink forming weights at this user terminal calculate normalization coefficient, and the computational methods of this normalization coefficient comprise, this normalization coefficient is on this given antenna, at the conjugation of the downlink forming weights of this user terminal.
Step 6403: the base station is according to above-mentioned normalization coefficient, downlink forming weight vector after the calculating normalized, computational methods comprise, for downlink forming weights at this user terminal, all multiply by above-mentioned normalization coefficient, obtain the downlink forming weight vector after the normalized, become 1 after the pairing downlink forming weights of this given antenna multiply by normalization coefficient.
Step 6404: the downlink forming weight vector after this normalized of base station stored.
Wherein, because above-mentioned normalization coefficient is the conjugation of the pairing downlink forming weights of above-mentioned given antenna, so, downlink forming weights after the pairing normalized of this given antenna are 1, and at all user terminals, when the downlink forming weight vector is made normalized, normalization coefficient all is the conjugation of the pairing downlink forming weights of this given antenna, so, for all user terminals, the downlink forming weights after the pairing normalized of this given antenna are always 1, consult Fig. 8, so the storage to the downlink forming weights after the pairing normalized of this given antenna is omitted in the base station when storage.
For example, the antenna number of base station is 3, and at the upward signal of certain user terminal, the downlink forming weight vector that calculates is (h
0, h
1, h
2), antenna 0,1,2 pairing downlink forming weights are followed successively by h
0, h
1, h
2, extract given antenna 1 pairing downlink forming weights h
1, normalization coefficient is the conjugation 1/h of antenna 1 pairing downlink forming weights
1, the downlink forming weight vector after the normalization is (h
0/ h
1, 1, h
2/ h
1), downlink forming weights after this given antenna 1 pairing normalized become 1, upward signal at all user terminals, when the downlink forming weight vector is made normalized, all extract given antenna 1 pairing downlink forming weights, so, at all user terminals, downlink forming weights after the antenna 1 pairing normalized are always 1, and does not store the downlink forming weights on the antenna 1 when storage the base station.
Based on the foregoing description, the antenna number of supposing the base station is N, the base station is when the downstream signal figuration, it is pairing to omit given antenna, the storage of the downlink forming weight vector after the normalized, and the multiplying in the time of can omitting this given antenna downlink forming can be saved the 1/N that preserves the shared memory space of downlink forming weights, can also save the 1/N of the amount of calculation that multiply by the downlink forming weights.
In actual applications, the antenna number of downlink forming is generally 2～8, based on the foregoing description, can save and preserve 12.5%～50% of the employed memory space of downlink forming weights, when having optimized the downstream signal figuration, the shared space resources of storage downlink forming weight vector.
Further, the downlink forming weights of base station after adopting normalized when downstream signal is carried out figuration, can be saved 12.5%～50% of amount of calculation, when having optimized the downstream signal figuration, and the time resource that multiplying is shared.
In sum, the embodiment of the invention, shared space resources and time resource when having optimized the downstream signal figuration saved the resource of system effectively, improved the operating efficiency of usage factor of system resource and system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a downstream signal shaping method is characterized in that, comprising:
Upward signal according to the user terminal that receives carries out channel estimating, obtains channel estimation value;
According to described channel estimation value, determine downlink forming weight vector at described user terminal;
Described downlink forming weight vector is made normalized, obtain the downlink forming weight vector after the normalized;
Adopt the downlink forming weight vector after the described normalized that described user terminal is carried out the downstream signal figuration.
2. the method for claim 1 is characterized in that, described downlink forming weight vector is made normalized, comprising:
At described user terminal, from the downlink forming weight vector, extract and the corresponding downlink forming weights of given antenna;
Downlink forming weights according to described given antenna calculate normalization coefficient;
According to described normalization coefficient, the downlink forming weight vector after the calculating normalized;
Preserve the downlink forming weight vector after this normalized.
3. the method for claim 1 is characterized in that, described user terminal is carried out the downstream signal figuration, comprising: to the signal of corresponding described user terminal on the non-given antenna, all multiply by the downlink forming weights after the corresponding normalized.
4. method as claimed in claim 2 is characterized in that, at all user terminals unified given antenna is set, and when calculating corresponding normalization coefficient at each user terminal, all extracts the pairing downlink forming weights of this given antenna.
5. method as claimed in claim 2 is characterized in that, the downlink forming weight vector after this normalized of described preservation comprises:
On storage all antennas except that described given antenna, the downlink forming weights after the corresponding normalized.
6. a downstream signal size enlargement apparatus is characterized in that, comprising:
First processing unit is used for carrying out channel estimating according to the upward signal of the user terminal that receives, and obtains channel estimation value;
Second processing unit is used for according to described channel estimation value, determines the downlink forming weight vector at described user terminal;
The 3rd processing unit is used for described downlink forming weight vector is made normalized, obtains the downlink forming weight vector after the normalized;
Manages the unit everywhere, is used to adopt the downlink forming weight vector after the described normalized to carry out the downstream signal figuration at described user terminal.
7. device as claimed in claim 6 is characterized in that, described the 3rd processing unit comprises:
The normalization coefficient computing unit is used at described user terminal, extracts from the downlink forming weight vector and the corresponding downlink forming weights of given antenna, and the downlink forming weights according to described given antenna calculate normalization coefficient;
The downlink forming weight calculation unit is used for according to described normalization coefficient, the downlink forming weight vector after the calculating normalized;
Memory cell is used to preserve the downlink forming weight vector after this normalized.
8. device as claimed in claim 6 is characterized in that, described manages the unit everywhere, comprising:
To the signal of corresponding described user terminal on the non-given antenna, all multiply by the downlink forming weights after the corresponding normalized.
9. device as claimed in claim 7 is characterized in that, the downlink forming weight vector after this normalized of described preservation comprises:
On storage all antennas except that described given antenna, the downlink forming weights after the corresponding normalized.
10. a downstream signal figuration system is characterized in that, comprising:
User terminal is used for sending upward signal to network side;
The downstream signal size enlargement apparatus, be used for carrying out channel estimating according to the upward signal of the user terminal that receives, obtain channel estimation value, according to channel estimation value, determine the downlink forming weight vector, and described downlink forming weight vector made normalized, adopt the downlink forming weight vector after the normalized that described user terminal is carried out the downstream signal figuration.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101863823A CN102263585A (en) | 2010-05-25 | 2010-05-25 | Method for downstream signal forming, apparatus thereof and system thereof |
| PCT/CN2010/077485 WO2011147148A1 (en) | 2010-05-25 | 2010-09-29 | Method，apparatus and system for downlink signal shaping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101863823A CN102263585A (en) | 2010-05-25 | 2010-05-25 | Method for downstream signal forming, apparatus thereof and system thereof |
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| CN102263585A true CN102263585A (en) | 2011-11-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1760905A1 (en) * | 2005-09-02 | 2007-03-07 | Mitsubishi Electric Information Technology Centre Europe B.V. | Method for controlling the transfer of signals from a first communication device to a second communication device through a wireless network |
| CN101192868A (en) * | 2006-11-24 | 2008-06-04 | 中兴通讯股份有限公司 | Multi-service wave bundle shaping device for wireless communication system |
| CN101355380A (en) * | 2007-07-27 | 2009-01-28 | 鼎桥通信技术有限公司 | Beam size enlargement method, system, user equipment and base station for multi-carrier system |
| CN101674120A (en) * | 2008-09-08 | 2010-03-17 | 大唐移动通信设备有限公司 | Method and device for forming multiuser wave beam |
-
2010
- 2010-05-25 CN CN2010101863823A patent/CN102263585A/en active Pending
- 2010-09-29 WO PCT/CN2010/077485 patent/WO2011147148A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1760905A1 (en) * | 2005-09-02 | 2007-03-07 | Mitsubishi Electric Information Technology Centre Europe B.V. | Method for controlling the transfer of signals from a first communication device to a second communication device through a wireless network |
| CN101192868A (en) * | 2006-11-24 | 2008-06-04 | 中兴通讯股份有限公司 | Multi-service wave bundle shaping device for wireless communication system |
| CN101355380A (en) * | 2007-07-27 | 2009-01-28 | 鼎桥通信技术有限公司 | Beam size enlargement method, system, user equipment and base station for multi-carrier system |
| CN101674120A (en) * | 2008-09-08 | 2010-03-17 | 大唐移动通信设备有限公司 | Method and device for forming multiuser wave beam |
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Application publication date: 20111130 |