CN101145818A - A broadcast wave bundle shaping method for smart antenna system - Google Patents
A broadcast wave bundle shaping method for smart antenna system Download PDFInfo
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- CN101145818A CN101145818A CNA2006100310658A CN200610031065A CN101145818A CN 101145818 A CN101145818 A CN 101145818A CN A2006100310658 A CNA2006100310658 A CN A2006100310658A CN 200610031065 A CN200610031065 A CN 200610031065A CN 101145818 A CN101145818 A CN 101145818A
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Abstract
The invention relates to a broadcast beam shaping method applied in an intelligent antenna. The invention comprises the following steps that: A, a cell is covered along the horizontal angle and is evenly divided into N equal portions. Each portion is of a subcell. Each subcell is expressed by n, and n is no less than 1 and no more than N. Each subcell n is covered with a narrow beam; B, According to the maximum cycle T second of the public use information, the resident time of the narrow beam in the subcell n is of a cycle T. The public use information with the cycle property adopts narrow beam shaping operation with the same service information within the cycle; C, the narrow beam residents in the subcell n for a cycle T and switches to the next subcell n+1 to carry out the shaping of the narrow beam; D, in turn in cycle successively. The method mainly solves the problem that for the TDD system, the existing method needs to cover the specific timeslot, which decreases the frequency band utilization rate, thereby being convenient in application in the TD-SCDMA system and the PHS system.
Description
Technical field
The present invention relates to the beam form-endowing method of antenna system in the mobile communication system, particularly a kind of broadcast wave bean shaping method that is applied to antenna system.
Background technology
For any mobile communication system, under limited power amplifier condition, obtain big as far as possible covering of broadcast beam omnidirectional and Traffic Channel and cover, be the target of pursuing all the time.In order to guarantee the correct receiving broadcasting information of terminal and omnidirectional's information, always energy is as much as possible launched simultaneously.
The appearance of intelligent antenna technology can be carried out wave beam forming at Traffic Channel, by suppressing noise and interference, has improved energy utilization efficiency greatly, has reduced the power amplifier cost; But for broadcast beam, general simple way is exactly the multi-antenna omnidirectional figuration, guarantees that to greatest extent its broadcast beam horizontal directivity pattern is " the approximate circle that waits ".Therefore for the FDD system, the proportion that the energy that broadcast beam consumed takies is relatively large, greatly reduces the coverage of business beam; For the TDD system, generally need take specific time slot, reduced band efficiency, as TD-SCDMA system and PHS system.
,, adopt after the antenna system simultaneously, cause the covering of business beam to be far longer than the covering of broadcast beam because each time slot has only a user for specific PHS system; For the TD-SCDMA system, there is same problem, (the Primary Common Control Physical Channel of P-CCPCH on the TSO time slot, Primary Common Control Physical Channel) covering of covering and DwPTS (Downlink Pilot Time Slot, descending pilot frequency time slot) becomes system descending and covers limited primary obstacle.
Even more serious: (1) is with present TD-SCDMA system, at the same environment of frequently arranging net of macrocellular, UE can receive at least that usually the same frequency P-CCPCH of 6 sectors and DwPTS are (in the previous experiments net, the reflection of UE end can be received the pilot tone of 10 sub-districts), only join P-CCPCH with TSO, the C/I of P-CCPCH and DwPTS (Carrier interference ratio) generally has only-8dB (Eb/N0=4dB), and normal demodulation Eb/NO (bit energy noise ratio), at city macrocellular environment, Eb/NO generally should be at 7-10dB, therefore cause the UE login, select network, the demodulation broadcast message, nearby region measurement is extremely difficult, there is bigger error, though the proposition of N frequency indemnity agreement (general 3 frequencies), C/I brings up to-3dB (Eb/NO=9dB), on presentation, the N frequency can slow down, overcome this problem, but in the possible reality not enough, for example, TSO has joined S-CCPCH (the Secondary Common Control Physical Channel of 3 physical code channels usually again, auxiliary Common Control Channel), even under 3 frequencies, the C/I of P-CCPCH generally also has only-7dB (Eb/NO=5dB), does not reach normal demodulation C/I; (2) because the TDD structure of TD-SCDMA system uniqueness; the skyborne reflection of TSO, DwPTS, the refraction of the near-end that present experimental network has reflected; TSO, the DwPTS direct projection of base station at a distance; these downstream signals cause guard time interval GP, UpPTS (Uplink Pilot Time Slot between up-downgoing; uplink pilot time slot) the serious interference of upward signal, as shown in Figure 1.Consequently UE inserts difficulty at random, corrective system success difficulty; Though adopted N frequency and unique processing demodulating algorithm at present, do not had really to solve the interference problem of this uniqueness of TDD system.
Simultaneously for multiaerial system, the unexpected inefficacy of some array element or its passage is complete possible thing in the system, after part array element lost efficacy, the directional diagram " distortion " of broadcast beam will be caused, and along with the increase of inefficacy element number of array and the diverse location combination of inefficacy array element, it is uncontrollable that the directional diagram of broadcast beam has become, to cause some place, sub-district not have pilot tone to cover substantially, and some local covering of sub-district increases unusually, have a strong impact on adjacent sub-district, cause more serious pilot tone " pollution ".Lost efficacy for array element, though can take certain indemnifying measure, emulation shows, only to the inefficacy under some a small amount of situation, and some effect, but for most situations, effect is limited.
Below being the course of work of UE, is example with the TD-SCDMA system:
After the UE start, at first search for the DwPTS signal, then by matched filtering, find specific system's group number, according to system's group number, further determine employed scrambler and basic Midamble sign indicating number then, demodulation TSO goes up the P-CCPCH code channel then, therefrom read the broadcast message of BCH (Broadcast Channel, broadcast channel).
For UE, as long as broadcast message has been read in start, before start next time, generally can not go to read BCH information again, promptly this moment, BCH information was unnecessary for this UE, removed nonsystematic BCH information and changed, notifications page notification UE, UE just can read BCH once more, and perhaps the descending step-out of UE needs synchronous again.In normal circumstances, just detect the received signal code channel power RSCP of P-CCPCH, do to measure for switching and prepare.
Simultaneously for system, always carry out the BCH information broadcast according to certain loop cycle ground, the general cycle is between a few tens of milliseconds to 1 second; For DwPTS, per 5 milliseconds are repeated to send once.
Summary of the invention
The object of the present invention is to provide a kind of broadcast wave bean shaping method that is applied to antenna system, mainly solve existing method and concerning the TDD system, need take specific time slot, reduce the technical problem of band efficiency, can be applied to TD-SCDMA system and PHS system easily.
For achieving the above object, technical scheme of the present invention is:
A kind of broadcast wave bean shaping method that is applied in the antenna system is characterized in that it comprises the steps:
A covers a sub-district along level angle, fixes evenly to be divided into the N equal portions, and each equal portions is a sub cell, and each sub-district is represented with n, 1≤n≤N, and each sub cell n covers with a narrow beam;
B is according to common information maximum cycle T, and narrow beam is one-period T in the time of staying of sub cell n, during adopt the narrow beam figuration identical to operate to common information with business information with periodic property;
The C narrow beam switches to next sub cell n+1 and carries out the narrow beam figuration after sub cell n stops one-period T;
Take turns successively by the cycle for D.
Among the described step B, when array element or channel failure, corresponding array element figuration element is put 0.
Described one-period T is 5 milliseconds a integral multiple.
Described step B further comprises:
B1 is according to formula (3), under the quantity N of whole angular region B that the wave beam of determining covers and sub cell, calculates the arrival bearing θ of the predetermined fixed of each sub cell
n,
When smart antenna array is classified line array as, carry out A2; When functional aerial array is a ring array, carry out A3;
B2 determines each sub cell θ according to step B1
n,, calculate good each sub cell common channel shape-endowing weight value separately again according to formula (1);
γ
k＝j(k-1)2πdsinθ
n/λ，k＝1，2，…，Ka (1)
B3 determines each sub cell θ according to step B1
n,, calculate good each sub cell common channel shape-endowing weight value separately again according to formula (2);
Wherein, Ka is an element number of array, and d is the spacing of adjacent array element, γ
kBe the element in the direction vector;
In above-mentioned formula (2), (3), Ka is an element number of array, and d is the spacing of adjacent array element, γ
kBe the element in the direction vector, θ
nArrival bearing for the predetermined fixed of each sub cell of each sub cell.
Among the described step B, when in the figuration process array element or channel failure being arranged, only need according to formula (1) or (2) calculating shape-endowing weight value the time, put 0 to the figuration element of corresponding array element or channel failure.
By the foregoing invention method, the present invention has following technique effect:
1, use method of the present invention, for the UE of optional position, the longest be spaced apart NT after, broadcast beam can cover again, and stops T.With the routine configuration, N=10, the T=200 millisecond, then maximum duration is spaced apart 2 seconds, can not cause any observable time delay to the UE logging in network.
2, use the inventive method, when part array element or channel failure, as long as reject the channel data that lost efficacy, need to do any processing hardly, adjacent sub-district without any influence, also almost (along with increasing of inefficacy array element or port number, is covered decline without any influence to this sub-district, but can reach not cover and lose by increasing the power of effective array element simultaneously).
3, use the inventive method, for the UE of optional position, angle from long-time statistical, its influence that disturbed by adjacent district pilots reduces (in theory for Ka array element, adjacent district pilots disturbs and reduces 10logKa dB), this is very favourable to this district pilots of the correct demodulation of this UE information, and particularly during identical networking, effect is more obvious.
4, use the inventive method, P-CCPCH and DwPTS reduce (in theory for Ka array element for the interference of GP, UpPTS, adjacent district pilots disturbs and reduces 10logKa dB), this signal to this sub-district corrective system and correct demodulation UpPTS is very favourable, particularly during identical networking, effect is more obvious;
Description of drawings
Fig. 1 is that TD-SCDMA is descending to up self-interference schematic diagram;
Fig. 2 is the flow chart of the inventive method step;
Fig. 3 is that ring array is arranged schematic diagram in the embodiment of the invention;
Fig. 4 is that embodiment of the invention cathetus battle array is arranged schematic diagram.
Embodiment
The invention provides a kind of broadcast wave bean shaping method that is applied in the antenna system, as shown in Figure 1, it comprises the steps:
A covers a sub-district along level angle, fixes evenly to be divided into the N equal portions, and each equal portions is a sub cell, and each sub-district is represented with n, 1≤n≤N, and each sub cell n covers with a narrow beam;
B is according to common information maximum cycle T, and narrow beam is one-period T in the time of staying of sub cell n, during adopt the narrow beam figuration identical to operate to common information with business information with periodic property;
The C narrow beam switches to next sub cell n+1 and carries out the narrow beam figuration after sub cell n stops one-period T;
Take turns successively by the cycle for D.
Sub cell among the above-mentioned steps A is cut apart, and for 8 antennas circle battle array, each professional narrow beam half-power fan is wide to be 35-36 ° substantially, at most only needs 10 narrow beams just can cover whole 360 ° of sub-districts, so N=10; For for 8 antenna linear arrays (120 ° of sectors), each professional narrow beam half-power fan wide the narrowest be 12 °, at most only need 10 narrow beams just can cover whole 120 ° of sub-districts, so N=10; For 4 antenna linear arrays (120 ° of sectors), each professional narrow beam half-power fan wide the narrowest be 32 °, at most only need 4 narrow beams just can cover whole 120 °, so N=4.
Below further introduce the inventive method by a specific embodiment:
By the linear array correlation theory as can be known: as shown in Figure 3: be arranged in straight line and form by Ka the equidistant d of array element, when arrival bearing DOA is θ, the element γ in its direction vector
kCan be expressed as
γ
k＝j(k-1)2πdsinθ/λ，k＝1，2，…，Ka (1)
For the circle battle array, as shown in Figure 2: Ka array element is evenly distributed on the circumference, and radius of a circle is r equally, and choosing the center of circle is reference point, when arrival bearing DOA is θ, and the element γ in the direction vector
kCan be expressed as
λ in its Chinese style (1), (2) is a carrier wavelength.
The whole angular region B that wave beam is covered is divided into N " sub cell ", and the angle of arrival of each " sub cell " is pre-defined to be
The concrete steps of this broadcast wave bean shaping method are:
The first step: calculate the common channel shape-endowing weight value of each sub cell, this step can be subdivided into again:
1.1, under B that determines and N, calculate the arrival bearing θ of the predetermined fixed of each sub cell according to formula (3)
nConventional for 8 antenna ring array, B=360 °, N=10; For 8 antenna line arraies, B=120 °, N=10; For 4 antenna line arraies, B=120 °, N=4
1.2 for line array, according to 1.1, at definite each sub cell θ
n(under 1≤n≤N),, calculate good each sub cell common channel shape-endowing weight value separately according to formula (1);
1.3 for ring array, according to 1.1, at definite each sub cell θ
n(under 1≤n≤N),, calculate good each sub cell common channel shape-endowing weight value separately according to formula (2);
Second step: according to common information maximum cycle T, in the initial moment of information cycle, from sub cell 1, the common channel shape-endowing weight value of the sub cell 1 that calculates with the first step carries out the common channel figuration;
The 3rd step: arrive constantly at common information next cycle T, the common channel shape-endowing weight value of the sub cell 2 that calculates with the first step carries out the common channel figuration;
The 4th step: and the like, and according to the cycle 1,2, _ _ _, N, 1,2, _ _ _ circulate;
The 5th step: when array element or channel failure, only need corresponding array element figuration element be put 0 get final product according to formula (1) or (2) calculating shape-endowing weight value the time, all operations still carries out according to second step to the 4th step.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (5)
1. a broadcast wave bean shaping method that is applied in the antenna system is characterized in that it comprises the steps:
A covers a sub-district along level angle, fixes evenly to be divided into the N equal portions, and each equal portions is a sub cell, and each sub-district is represented with n, 1≤n≤N, and each sub cell n covers with a narrow beam;
B is according to common information maximum cycle T, and narrow beam is one-period T in the time of staying of sub cell n, during adopt the narrow beam figuration identical to operate to common information with business information with periodic property;
The C narrow beam switches to next sub cell n+1 and carries out the narrow beam figuration after sub cell n stops one-period T;
Take turns successively by the cycle for D.
2. the broadcast wave bean shaping method that is applied in the antenna system according to claim 1 is characterized in that among the described step B, when array element or channel failure, corresponding array element figuration element is put 0.
3. the broadcast wave bean shaping method that is applied in the antenna system according to claim 1 and 2 is characterized in that described one-period T is 5 milliseconds a integral multiple.
4. the broadcast wave bean shaping method that is applied in the antenna system according to claim 1 is characterized in that described step B further comprises:
B1 is according to formula (3), under the quantity N of whole angular region B that the wave beam of determining covers and sub cell, calculates the arrival bearing θ of the predetermined fixed of each sub cell
n,
When smart antenna array is classified line array as, carry out A2; When functional aerial array is a ring array, carry out A3;
B2 determines each sub cell θ according to step B1
n,, calculate good each sub cell common channel shape-endowing weight value separately again according to formula (1);
γ
k＝j(k-1)2πdsinθ
n/λ，k＝1，2，…，Ka (1)
B3 determines each sub cell θ according to step B1
n,, calculate good each sub cell common channel shape-endowing weight value separately again according to formula (2);
Wherein, Ka is an element number of array, and d is the spacing of adjacent array element, γ
kBe the element in the direction vector;
In above-mentioned formula (2), (3), Ka is an element number of array, and d is the spacing of adjacent array element, γ
kBe the element in the direction vector, θ
nArrival bearing for the predetermined fixed of each sub cell of each sub cell.
5. the broadcast wave bean shaping method that is applied in the antenna system according to claim 4, it is characterized in that among the described step B, when in the figuration process array element or channel failure being arranged, only need according to formula (1) or (2) calculating shape-endowing weight value the time, put 0 to the figuration element of corresponding array element or channel failure.
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| WO2009075622A1 (en) * | 2007-12-12 | 2009-06-18 | Telefonaktiebolaget Lm Ericsson (Publ) | An improved broadcast channel. |
| CN101692733B (en) * | 2009-08-26 | 2012-11-28 | 南京邮电大学 | Intelligent antenna array broadcast beam formation method and device |
| CN101615936B (en) * | 2008-06-24 | 2012-12-12 | 鼎桥通信技术有限公司 | Method for forming downlink beam |
| CN101848021B (en) * | 2009-03-24 | 2013-02-20 | 大唐移动通信设备有限公司 | Method and device for generating broadcast beam weight of intelligent antenna array |
| CN105122664A (en) * | 2012-11-28 | 2015-12-02 | 英特尔公司 | Using multiple frequency bands with beamforming assistance in a wireless network |
| CN106301508A (en) * | 2015-05-19 | 2017-01-04 | 中兴通讯股份有限公司 | The order reducing method of a kind of antenna channels and device |
| WO2017035761A1 (en) * | 2015-08-31 | 2017-03-09 | 华为技术有限公司 | Method and apparatus for transmitting data |
| CN111711500A (en) * | 2020-05-06 | 2020-09-25 | 中国人民解放军63892部队 | Simulation antenna array calibration and radio frequency signal monitoring system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009075622A1 (en) * | 2007-12-12 | 2009-06-18 | Telefonaktiebolaget Lm Ericsson (Publ) | An improved broadcast channel. |
| CN101615936B (en) * | 2008-06-24 | 2012-12-12 | 鼎桥通信技术有限公司 | Method for forming downlink beam |
| CN101848021B (en) * | 2009-03-24 | 2013-02-20 | 大唐移动通信设备有限公司 | Method and device for generating broadcast beam weight of intelligent antenna array |
| CN101692733B (en) * | 2009-08-26 | 2012-11-28 | 南京邮电大学 | Intelligent antenna array broadcast beam formation method and device |
| CN105122664A (en) * | 2012-11-28 | 2015-12-02 | 英特尔公司 | Using multiple frequency bands with beamforming assistance in a wireless network |
| CN106301508A (en) * | 2015-05-19 | 2017-01-04 | 中兴通讯股份有限公司 | The order reducing method of a kind of antenna channels and device |
| CN106301508B (en) * | 2015-05-19 | 2020-09-25 | 中兴通讯股份有限公司 | Order reduction method and device for antenna channel |
| WO2017035761A1 (en) * | 2015-08-31 | 2017-03-09 | 华为技术有限公司 | Method and apparatus for transmitting data |
| CN107211290A (en) * | 2015-08-31 | 2017-09-26 | 华为技术有限公司 | A kind of method and device for sending data |
| US10993123B2 (en) | 2015-08-31 | 2021-04-27 | Huawei Technologies Co., Ltd. | Data sending method and apparatus |
| CN111711500A (en) * | 2020-05-06 | 2020-09-25 | 中国人民解放军63892部队 | Simulation antenna array calibration and radio frequency signal monitoring system |
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Application publication date: 20080319 |