CN101227214B - Intelligent antenna setting method of code division multiple access system - Google Patents
Intelligent antenna setting method of code division multiple access system Download PDFInfo
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- CN101227214B CN101227214B CN2007100019402A CN200710001940A CN101227214B CN 101227214 B CN101227214 B CN 101227214B CN 2007100019402 A CN2007100019402 A CN 2007100019402A CN 200710001940 A CN200710001940 A CN 200710001940A CN 101227214 B CN101227214 B CN 101227214B
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Abstract
The invention discloses a network organizing method of a CDMA system, wherein the CDMA system comprises an intelligent antenna system, wherein the method comprises: firstly, arranging two or more than two intelligent antenna subsystems, and the summation of the antenna array element number in the intelligent antenna system is the antenna array element number which is predetermined, secondly, arranging all the intelligent antenna baseband processing modules in the intelligent antenna system to connect with a diversity combining module, carrying out corresponding intelligent antenna baseband processing module which receives input signals when the intelligent antenna system receives signals, and then outputting signals to the diversity combining module to do a combining process, and thirdly, independently forming descending shaped beam by the baseband intelligent antenna processing module in each intelligent antenna subsystem when the intelligent antenna system transmits signals. The method which is provided by the invention is utilized to prevent the problem of dropping call and incomplete coverage of a single antenna array, which also reduces the size of the antenna array and is convenient for installing.
Description
Technical field
(Code Division Multiple Access, the CDMA) network-building method of system relates to a kind of method of utilizing smart antenna to carry out the cdma system networking especially to the present invention relates to a kind of code division multiple access.
Background technology
Interference-limited in mobile communication system, the especially cdma system between the multi-user the open ended number of users of system, make system present interference-limited characteristic.When the cdma system networking, introduce antenna system, can reduce the interference between the multi-user in the system by space filtering.Smart antenna is based on the adaptive array principle, utilizes the wave beam forming of antenna array to produce a plurality of independently wave beams, and adjusts beam direction adaptively and follow the tracks of each user, reaches and improves Signal Interference and Noise Ratio SINR, increases the purpose of power system capacity.
As shown in Figure 1, the composition of antenna system can consist essentially of in the prior art: antenna array, radio-frequency channel group and smart antenna baseband processing module.Antenna array itself is made up of the bay of N spatial distribution, each bay is all sent into the smart antenna baseband processing module with the signal that receives after through radio-frequency channel separately and is handled, perhaps the baseband signal that the smart antenna baseband processing module is sent is modulated on the radio-frequency channel.
Antenna array can be divided into usually according to the arranging situation of bay: various ways such as line array, ring array, planar array, disturbed conditions such as coupling, reflection can appear between adjacent bay, in present cdma system, in order to obtain the interference between higher figuration gain and minimizing multi-user, adopt the fan section intelligent antenna system of 8 bay line array structures more.Yet in the more mobile communication scene of dense city or high-lager building, multi-path environment complexity and pace of change are fast, than the narrow beam smart antenna sense are followed the tracks of becoming difficulty relatively, may produce the situation that receiving terminal can't received signal.This phenomenon is called as " call drop " phenomenon in radio communication, this phenomenon is can not be received.Under this scene, the directionality that smart antenna is good has increased the possibility of system " call drop ", desired avoiding when this is system design on the contrary.
Still the antenna system with the line array structure is an example, and in order to make the antenna coupled interference less, the minimum spacing d between the array element generally is taken as λ/2, and wherein λ is a carrier signal wavelength.But in different application, array element distance d is λ/2 o'clock, and coupled interference might be able to not meet the demands, at this moment, can the bay spacing be set to d=k λ/2, and k ∈ N and k 〉=2, thus, thus the coupled interference between antenna can further reduce to meet the demands.Thereby, in order get rid of to disturb as far as possible and for satisfying space diversity minimum reception antenna distance, the spacing of bay is got λ/2 to a value between 10 λ according to actual conditions usually in the antenna array.
And in practice, adopting above-mentioned array element distance that antenna array is set, even adopt the bay spacing of λ/2, is example with the cdma system that is operated in 2010MHz, if adopt the antenna system of 8 bay line array structures, the width of antenna will be not less than 53cm.Thus, the size of smart antenna usually can be very big, and this will safeguard the more problem of all bringing to the siting of station, engineering construction.
Summary of the invention
Technical problem to be solved by this invention provides a kind of smart antenna method to set up of cdma system, solves the cutting off rate height, the big problem of base station engineering construction difficulty that exist in the prior art.
The present invention realizes by following technical proposals:
A kind of smart antenna method to set up of code division multiple access system, described code division multiple access system comprises antenna system, determines bay number in the antenna system according to the capacity requirement of code division multiple access system and coverage, this method comprises:
(a) two or more smart antenna subsystems are set, described smart antenna subsystem comprises: one or above antenna array, with antenna array in each bay radio-frequency channel of corresponding connection and the smart antenna baseband processing module that is connected with all radio-frequency channels respectively; All bay numbers are predetermined bay number in the described antenna system;
(b) all smart antenna baseband processing modules being set is connected with diversity merging module; When described antenna system received signal, each bay will receive signal and handle through the radio-frequency channel corresponding smart antenna baseband processing module of input separately in this system; The output signal of all smart antenna baseband processing modules exports in the diversity merge cells and merges processing;
(c) when described antenna system transmits, the base band smart antenna processing module of each smart antenna subsystem independently forms the downlink forming wave beam.
Further, comprise N bay in the described antenna array, the distance of a described N bay is greater than 10 λ, and wherein, λ is incoming signal or the carrier wavelength that transmits.
Further, this method also comprises: the normal of a described antenna array is according to the predetermined angular setting arbitrarily.
Further, described any antenna array is arranged on different places.
Further, described any antenna array is arranged on identical place.
Further, this method also comprises: two or more described antenna arrays are provided with at interval according to vertical direction, and vertical range is greater than λ/2 between two bays in the different antennae battle array, and wherein, λ is incoming signal or the carrier wavelength that transmits.
Further, described antenna array is fan antenna battle array, whole day to antenna array, cuts out wave beam and cover any in many array-element antenna battle array of shape algorithm.
Utilize the antenna system that utilizes proposed by the invention to carry out the cdma system network-building method, the infull problem of call drop and individual antenna battle array coverage that can prevent effectively takes place, and can also make the size of antenna array be unlikely to excessive, the convenient installation; Utilize said method simultaneously, can transform easily existing C DMA grid.
Description of drawings
Fig. 1 is the basic structure schematic diagram of antenna system in the prior art;
Fig. 2 is the basic structure schematic diagram of antenna system in the embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to introduce further, but not as a limitation of the invention.
Design philosophy of the present invention is: during owing to the cdma system networking, the bay sum that can determine antenna system in this cdma system according to the capacity and the coverage of cdma system, utilize the less antenna system of array number to have these characteristics of wave beam that the antenna system bigger than array number has broad, the less smart antenna subsystem of several array numbers is set in same sub-district, the received signal of each smart antenna subsystem merges output again after the processing with result after separately smart antenna baseband processing module is handled.
In cdma system networking process, with 8 array elements is example, be used for same sub-district antenna system the basic structure schematic diagram as shown in Figure 2, as can be seen from the figure, this antenna system comprises that 1 diversity merges module and 2 smart antenna subsystem A and B with 4 bays; Smart antenna subsystem A is the same with antenna system structure of the prior art with B, just the smart antenna baseband processing module in each smart antenna subsystem all is connected with a shared diversity merging module.
When above-mentioned antenna system received signal, each array element in each smart antenna subsystem will receive signal and enter pairing smart antenna baseband processing unit through separately radio-frequency channel, after handling therein, signal exported in the diversity merge cells merge processing, obtain diversity gain further.
When above-mentioned antenna system transmitted, the information of each smart antenna subsystem emission was identical, independently formed the downlink forming wave beam with existing method in each self-corresponding base band smart antenna processing module.
In order to make the antenna coupled interference in the adjacent smart antenna subsystem less, the distance between continuous 4 intelligent antenna arrays should be greater than 10 λ.
In above-mentioned narration, the smart antenna subsystem in the same antenna system is used for same sub-district, can be arranged in the same cell equipment and realizes by the smart antenna baseband processing module in the above-mentioned smart antenna subsystem and diversity being merged module.
Illustrate a bit: in the above-described embodiments, radio-frequency channel, smart antenna baseband processing module are same as the prior art, thereby repeat no more; And in the diversity merge cells output signal of a plurality of smart antenna baseband processing modules is merged the method for processing, and also can select several different methods of the prior art for use according to actual conditions, also repeat no more.
In the present embodiment, because the bay number is less in the smart antenna subsystem, its bay wave beam in prior art this sub-district only use an antenna system time the bay wave beam of antenna system wide, thereby its follow-up control to the wireless signal direction is eager to excel in whatever one does, can prevent the generation of call drop phenomenon effectively.
Illustrate a bit: the above embodiments comprise that with an antenna system two smart antenna subsystems are that example describes, above-mentioned method also can be generalized to the situation that an antenna system comprises N smart antenna subsystem simply, concrete implementation method is same as described above, does not repeat them here.
Further, when the smart antenna array addressing relatively the difficulty, and when being difficult to cover the scene of same panel region with an antenna system of the prior art, the N that is used for same sub-district in a said method smart antenna subsystem can be come burst to cover the different local of this zone, at this moment, the normal direction of each smart antenna subsystem can be set to inequality, and arbitrarily angled setting between 0 °～180 ° as required, this moment is when described antenna system transmits, the broadcast message of each smart antenna subsystem emission is identical, and because different smart antenna subsystems is used to cover different zones, so the data message difference of different smart antenna subsystems emission.
Say further again, if any two intelligent antenna arrays are set to perpendicular separation and put, then can replenish mutually and form continuous, good covering, thereby can solve black problem under the tower that is caused owing to technology imperfections such as smart antenna fillings at zero point in the prior art.At this moment, the vertical range of smart antenna array should be greater than λ/2 in two vertical smart antenna subsystems of placing, thereby make the antenna array coupled interference in the adjacent smart antenna subsystem less.
Also need explanation a bit, the smart antenna array of being mentioned in the embodiment of the invention comprises that fan antenna battle array, whole day are to antenna array, can also comprise and close many array-element antenna battle array that wave beam covers the shape algorithm, can select multi-form antenna array for use in the different intelligent antenna subsystem in the same sub-district.
From the foregoing description as can be seen, when cdma system carries out networking, utilize above-mentioned antenna system can prevent effectively that call drop and the infull problem of single smart antenna array coverage from taking place, and can also make the size of antenna array be unlikely to excessive, the convenient installation; Utilize said method simultaneously, can transform easily existing C DMA grid, only need replace with N the smart antenna subsystem that array element is less by the antenna system that array element in the existing network is more this moment, and N is greater than l, less than the integer of element number of array in the former antenna system, does not need this moment the hardware of existing base station equipment is carried out bigger transformation or even transformation.
Claims (7)
1. the smart antenna method to set up of a code division multiple access system, described code division multiple access system comprises antenna system, determine bay number in the antenna system to it is characterized in that this method comprises according to the capacity requirement of code division multiple access system and coverage:
(a) two or more smart antenna subsystems are set, described smart antenna subsystem comprises: one or above antenna array, with antenna array in each bay radio-frequency channel of corresponding connection and the smart antenna baseband processing module that is connected with all radio-frequency channels respectively; All bay numbers are predetermined bay number in the described antenna system;
(b) all smart antenna baseband processing modules being set is connected with diversity merging module; When described antenna system received signal, each bay will receive signal and handle through the radio-frequency channel corresponding smart antenna baseband processing module of input separately in this system; The output signal of all smart antenna baseband processing modules exports in the diversity merge cells and merges processing;
(c) when described antenna system transmits, the base band smart antenna processing module in each smart antenna subsystem independently forms the downlink forming wave beam.
2. the method for claim 1 is characterized in that, comprises N bay in the described antenna array, and the distance of a described N bay is greater than 10 λ, and wherein, λ is incoming signal or the carrier wavelength that transmits.
3. the method for claim 1 is characterized in that, this method also comprises: the normal of a described antenna array is according to the predetermined angular setting arbitrarily.
4. method as claimed in claim 3 is characterized in that, described any antenna array is arranged on different places.
5. method as claimed in claim 3 is characterized in that, described any antenna array is arranged on identical place.
6. the method for claim 1, it is characterized in that, this method also comprises: two or more described antenna arrays are provided with at interval according to vertical direction, vertical range is greater than λ/2 between two bays in the different antennae battle array, wherein, λ is incoming signal or the carrier wavelength that transmits.
7. the method for claim 1 is characterized in that, described antenna array is fan antenna battle array, whole day to antenna array, close wave beam covers any in many array-element antenna battle array of shape algorithm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100019402A CN101227214B (en) | 2007-01-15 | 2007-01-15 | Intelligent antenna setting method of code division multiple access system |
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| CN2007100019402A CN101227214B (en) | 2007-01-15 | 2007-01-15 | Intelligent antenna setting method of code division multiple access system |
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| CN101227214B true CN101227214B (en) | 2011-04-20 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6049307A (en) * | 1997-08-04 | 2000-04-11 | Samsung Electronics Co., Ltd. | Adaptive phased array antenna using weight memory unit |
| CN1391310A (en) * | 2001-06-12 | 2003-01-15 | 莫比斯菲尔有限公司 | Intellectual antenna array and improvement concerned |
| CN1398128A (en) * | 2001-07-14 | 2003-02-19 | 深圳市中兴通讯股份有限公司 | Linear conversion method for receiving and transmitting right values of array antenna |
| CN1423430A (en) * | 1997-04-02 | 2003-06-11 | 松下电器产业株式会社 | Self-adaptive transmission diversity apparatus and method thereof |
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2007
- 2007-01-15 CN CN2007100019402A patent/CN101227214B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1423430A (en) * | 1997-04-02 | 2003-06-11 | 松下电器产业株式会社 | Self-adaptive transmission diversity apparatus and method thereof |
| US6049307A (en) * | 1997-08-04 | 2000-04-11 | Samsung Electronics Co., Ltd. | Adaptive phased array antenna using weight memory unit |
| CN1391310A (en) * | 2001-06-12 | 2003-01-15 | 莫比斯菲尔有限公司 | Intellectual antenna array and improvement concerned |
| CN1398128A (en) * | 2001-07-14 | 2003-02-19 | 深圳市中兴通讯股份有限公司 | Linear conversion method for receiving and transmitting right values of array antenna |
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