CN104244273B - A kind of method of Fast back-projection algorithm broadcast beam of smart antenna - Google Patents
A kind of method of Fast back-projection algorithm broadcast beam of smart antenna Download PDFInfo
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- CN104244273B CN104244273B CN201310230785.7A CN201310230785A CN104244273B CN 104244273 B CN104244273 B CN 104244273B CN 201310230785 A CN201310230785 A CN 201310230785A CN 104244273 B CN104244273 B CN 104244273B
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Abstract
This application discloses a kind of method of Fast back-projection algorithm broadcast beam of smart antenna, including：A, the actual environment according to residing for base station determines initial target broadcast forming vectors w；B, broadcast beam F is synthesized according to target broadcast forming vectors w；When performing for the first time, the target broadcast forming vectors w is initial target broadcast forming vectors w；C, judge whether to meet：Broadcast beam is directed toward is less than first threshold with the absolute value of the difference of preset target direction, and beam angle meets the expected absolute value of the difference for referring to beam angle and target width and is less than second threshold；If so, performing step D, step E is otherwise performed；D, using the broadcast figuration factor of target broadcast forming vectors w more new systems and terminate this flow；E, a certain range of the parameter in target broadcast forming vectors w near its numerical value is finely adjusted, is then back to step C.Application scheme can quickly provide the broadcast figuration factor, and to the adaptable of optimization scene.
Description
Technical field
This application involves mobile communication technology field more particularly to a kind of sides of Fast back-projection algorithm broadcast beam of smart antenna
Method.
Background technology
With being on the increase for wireless communication standard, the selection of communication base station site is more and more difficult, and many sites may
It is not the optimal location in the network planning.It is and more and more under many scenes as common people are to the fear of electromagnetic radiation
The antenna beautified using appearance, such as appearance is as the antenna or appearance of gardening trees are as antenna of advertisement and identifier etc..This
The antenna of kind of appearance beautification is difficult to carry out machinery adjustment, so as to when carrying out beehive net, generating between adjacent sectors and
Co-channel interference between neighboring community, this interference can bring very big influence for wireless communication.
It is mainly to adjust the angle of declination of antenna for the scheme that the interference optimizes, azimuth, and this adjustment needs
The upper station of worker, cost is higher, and risk is larger.In addition it can be optimized by adjusting direction, broadband of broadcast beam etc., this
It just needs targetedly to adjust broadcast beam weight, it is whole that this adjustment belongs to soft, at low cost and efficient.
It is well known that broadcast beam of smart antenna is integrated by beam of unit, therefore smart antenna producer in manufacture
The corresponding broadcast weight value of the antenna can be provided, the broadcast beam of weights synthesis is symmetrical with normal direction, and to beam angle
Deng with strict demand.This weights can directly use most of networking scene, but for certain special screnes,
Such as asymmetric covering scene, some interference problems can be brought.It thus needs to carry out rapid Optimum according to practical application scene,
Generation has targetedly broadcast weight value.
The synthesis of broadcast beam of smart antenna designs a cost letter first mostly by the way of exhaustive search at present
Then number carries out exhaustive search using simulated annealing or genetic algorithm.The major defect of this method is：
Search time is long, generally requires several hours；
The design comparison of cost function is complicated；
It is strong for symmetrical covering validity, and the search difficulty of special covering is big.
Invention content
This application provides a kind of method of Fast back-projection algorithm broadcast beam of smart antenna, can quickly provide broadcast figuration because
Son, and to the adaptable of optimization scene.
A kind of method of Fast back-projection algorithm broadcast beam of smart antenna provided by the embodiments of the present application, including：
A, the actual environment according to residing for base station determines initial target broadcast forming vectors w；
B, broadcast beam F is synthesized according to target broadcast forming vectors w；When performing for the first time, the target broadcast forming vectors w
For initial target broadcast forming vectors w；
C, judge whether to meet：Broadcast beam is directed toward is less than the first threshold with the absolute value of the difference of preset target direction
Value, beam angle meet the expected absolute value of the difference for referring to beam angle and target width and are less than second threshold；If so, perform step
Otherwise rapid D performs step E；
D, using the broadcast figuration factor of target broadcast forming vectors w more new systems and terminate this flow；
E, a certain range of the parameter in target broadcast forming vectors w near its numerical value is finely adjusted, be then back to
Step C.
Preferably, the step A includes：
A1, the actual environment according to residing for base station, determine the target component of broadcast beam optimization, and the target component includes
Main beam is directed toward θ, main beam width β；
A2, θ selecting business forming vectors w1 is directed toward according to main beam：According to main beam width β, selected antenna producer provides
Broadcast forming vectors w2；
A3, generated according to the business forming vectors w1 and broadcast forming vectors w2 initial target broadcast forming vectors w=
w1×w2。
3rd, according to the method described in claim 1, it is characterized in that, being closed described in step B according to target broadcast forming vectors w
It is that broadcast beam F is synthesized according to equation below into broadcast beam F：
Wherein, i is antenna serial number, and N is antenna sum, and G is unit wave
Beam, AF are array factor.
Preferably, the first threshold and second threshold are 5 degree of deflections.
Preferably, step D further comprises：Newer forming vectors w is done with the element of modulus value maximum in forming vectors w
Normalized.
As can be seen from the above technical solutions, the feature of conventional broadcast wave beam and business beam is utilized in application scheme,
There is linear superposition characteristic using Beam synthesis, so as to quickly realize searching for the broadcast beam factor of adaptation practical application scene
Rope.
Description of the drawings
Fig. 1 is the realization flow signal of the method for Fast back-projection algorithm broadcast beam of smart antenna provided by the embodiments of the present application
Figure；
Fig. 2 is the obtained broadcast beam and original broadcast beam comparison diagram according to the embodiment of the present application scheme.
Specific embodiment
Technical principle, feature and technique effect to make technical scheme is clearer, below in conjunction with specific reality
Example is applied technical scheme is described in detail.
The embodiment of the present application illustrates technical scheme by taking 4 unit linear arrays as an example, those skilled in the art's root
The scheme of the synthesis broadcast beam of smart antenna of the unit linear array for other numbers can be unambiguously obtained according to the explanation.
The realization flow of the method for Fast back-projection algorithm broadcast beam of smart antenna provided in this embodiment as shown in Figure 1, including
Following steps：
Step 101：Actual environment according to residing for base station determines the target component of broadcast beam optimization, main to include master
Beam position θ, main beam width β；
Step 102：θ selecting business forming vectors w1 is directed toward according to main beam：According to main beam width β, antenna factory is selected
The broadcast forming vectors w2 that family provides.
The embodiment of the present application provides a kind of formula of business forming vectors w1：
w1=[exp(-1.5jkdcos(θ)),exp(-0.5jkdcos(θ)),exp(0.5jkdcos(θ)),exp
(1.5jkdcos (θ))],
Wherein, j is complex factor, and d is the distance between antenna element,For wave number.
Under normal circumstances, antenna producer provides corresponding broadcast forming vectors respectively for different main beam widths, because
This can select the corresponding broadcast forming vectors that antenna producer provides according to required main beam width.
Step 103：Initial target broadcast figuration is generated according to the business forming vectors w1 and broadcast forming vectors w2
Vector w=w1 × w2；
Step 104：Broadcast beam F is synthesized according to target broadcast forming vectors w.
The embodiment of the present application provides a kind of formula for synthesizing broadcast beam F：
Wherein, i is antenna serial number, and N is antenna sum, and G is unit wave
Beam, AF are array factor.
Step 105：Whether the direction and beam angle for judging the broadcast beam meet expection, if so, step 106 is performed,
Otherwise step 108 is performed.In the embodiment of the present application, the direction of broadcast beam, which meets, is expected to refer to that broadcast beam is directed toward with setting in advance
The absolute value of the difference of fixed target direction is less than first threshold, beam angle meet it is expected refer to beam angle and target width it
Absolute value of the difference is less than second threshold.Wherein, first threshold and second threshold are 5 degree of deflections.
Step 106：Utilize the broadcast figuration factor of target broadcast forming vectors w more new systems.
Step 107：Normalized done with the element of modulus value maximum in forming vectors w to newer forming vectors w, i.e. w=
w./max(abs(W)).The effect of this step is to try to make the pattern of the factor in forming vectors maximum, so as to maximum RRU channels
Transmission power.I.e. under the premise of broadcast beam shape is ensured, covering is improved as possible.The step is optional step.
Step 108：If expection cannot be met, to the parameter in target broadcast forming vectors w near its numerical value one
Determine range to be finely adjusted, be then back to step 104.
Fig. 2 is the obtained broadcast beam and original broadcast beam comparison diagram according to the embodiment of the present application scheme.It is 65 degree wide
When to broadcast wave beam be that antenna appears on the scene, the corresponding beam pattern of the broadcast figuration factor that antenna producer gives, it is suitble under conventional scenario
Covering；The broadcast beam that 10 degree of right avertence is the scene for 10 degree of the right avertence that antenna normal direction is in for user, according to the application
The broadcast beam that technical solution obtains.From figure 2 it can be seen that under the scene of 10 degree of right avertence, application scheme obtains wide
Broadcast the entire gain that wave beam entire gain is better than original broadcast beam.
The foregoing is merely the preferred embodiment of the application, not to limit the protection domain of the application, it is all
The spirit of technical scheme and any modification, equivalent substitution, improvement and etc. within principle, done, should be included in this Shen
Within the scope of please protecting.
Claims (4)
- A kind of 1. method of Fast back-projection algorithm broadcast beam of smart antenna, which is characterized in that including：A, the actual environment according to residing for base station determines initial target broadcast forming vectors w；B, broadcast beam F is synthesized according to target broadcast forming vectors w；When performing for the first time, the target broadcast forming vectors w is first The target broadcast forming vectors w of beginning；C, judge whether to meet：Broadcast beam is directed toward is less than first threshold with the absolute value of the difference of preset target direction, The absolute value of the difference of beam angle and target width is less than second threshold；If so, performing step D, step E is otherwise performed；D, using the broadcast figuration factor of target broadcast forming vectors w more new systems and terminate this flow；E, a certain range of the parameter in target broadcast forming vectors w near its numerical value is finely adjusted, is then back to step B；Wherein, the step A includes：A1, the actual environment according to residing for base station, determine the target component of broadcast beam optimization, and the target component includes main wave Shu Zhixiang θ, main beam width β；A2, θ selecting business forming vectors w1 is directed toward according to main beam：According to main beam width β, selected antenna producer provides wide Broadcast forming vectors w2；A3, initial target broadcast forming vectors w=w1 is generated according to the business forming vectors w1 and broadcast forming vectors w2 ×w2。
- 2. it according to the method described in claim 1, it is characterized in that, is synthesized extensively according to target broadcast forming vectors w described in step B It is to synthesize broadcast beam F according to equation below to broadcast wave beam F：Wherein, i is antenna serial number, and N is antenna sum, and G is beam of unit, and AF is Array factor.
- 3. according to the method described in claim 1, it is characterized in that, the first threshold and second threshold are 5 degree of deflections.
- 4. according to the method described in claim 1, it is characterized in that, step D further comprises：To newer forming vectors w with The element of modulus value maximum does normalized in forming vectors w.
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| CN101335554A (en) * | 2007-06-29 | 2008-12-31 | ***电信传输研究所 | Method for flexibly setting beam width of omni-directionally transmitting channel |
| CN101834648A (en) * | 2010-04-20 | 2010-09-15 | 新邮通信设备有限公司 | Method for generating weight value of intelligent antenna and base station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY165076A (en) * | 2011-08-11 | 2018-02-28 | Aviat Networks Inc | Systems and methods of antenna orientation in a point-to-point wireless network |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335554A (en) * | 2007-06-29 | 2008-12-31 | ***电信传输研究所 | Method for flexibly setting beam width of omni-directionally transmitting channel |
| CN101834648A (en) * | 2010-04-20 | 2010-09-15 | 新邮通信设备有限公司 | Method for generating weight value of intelligent antenna and base station |
Non-Patent Citations (2)
| Title |
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| 利用智能天线广播波束赋形实现小区覆盖优化;李晓明;《TD与LTE技术创新论坛》;20090615;全文 * |
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