CN102710309B - Be applicable to the synchronizing signal launching technique of large-scale antenna array - Google Patents
Be applicable to the synchronizing signal launching technique of large-scale antenna array Download PDFInfo
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- CN102710309B CN102710309B CN201210177921.6A CN201210177921A CN102710309B CN 102710309 B CN102710309 B CN 102710309B CN 201210177921 A CN201210177921 A CN 201210177921A CN 102710309 B CN102710309 B CN 102710309B
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- synchronizing signal
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Abstract
The invention discloses a kind of synchronizing signal launching technique being applicable to large-scale antenna array, comprise the following steps: the aerial array of a, base station is one dimensional linear array or two-dimensional rectangle battle array; First b, base station generate original synchronizing signal, and use weight vectors that original synchronizing signal is mapped to each antenna or beam port, the synchronizing signal after mapping sends through each antenna; C, can not use in the same time each other low relevant weight vectors to realize transmit diversity.The present invention when the aerial array of base station be one dimensional linear array or two-dimensional rectangle battle array time, as weight vectors, original synchronizing signal is mapped to each antenna or beam port by using circulation orthogonal sequence, the omnidirectional of synchronizing signal in current area (or sector) can be realized cover, its implementation complexity is low, between different scenes, there is versatility, at utmost can utilize transmitting power, omnidirectional can be realized within a short period of time and cover.
Description
Technical field
The present invention relates to a kind of mobile communication system using large-scale antenna array in base station side, particularly relate to the transmitting realizing synchronizing signal in large-scale antenna array.
Background technology
For adapting to the needs of future development, mobile communication system requires to support the high-speed packet data transmission even going up gigabit up to per second hundreds of million, when radio spectrum resources day is becoming tight, adopt multiple antennas transmission and multiple antennas to receive the Radio Transmission Technology of (MIMO), be one of mainstream technology of moving communicating field research in the past over more than ten years always.Be subject to antenna number quantitative limitation (for the LTE-A of 3GPP, it supports at most 8 transmit antennas in base station side), the spectrum efficiency of traditional MIMO technology is still lower, therefore using more antenna configuration to excavate Spatial Dimension resource further in base station side, is one of development trend of future mobile communication system.When base station is configured extensive antenna (tens even up to a hundred), be limited to the restriction of bulk, and in order to utilize the correlation between antenna, the antenna distance (being no more than 1 carrier wavelength) that general employing is less.
It is synchronously the matter of utmost importance that mobile communication system design need be considered.In general mobile communication system, user's (travelling carriage) need after the power-up first to detect synchronizing channel to complete community (or sector) search, community select and and base station between set up Time and Frequency Synchronization.Due to the feature that the uncertainty of each customer location and the position of a large number of users are evenly distributed in community, therefore the synchronizing signal in community must send with omnidirectional's form when launching, namely the transmitting power of synchronizing signal should be even as far as possible in all directions, ensures that the user of all directions in community can obtain evenly synchronous signal receiver signal to noise ratio reliably with this.Except synchronizing signal, also have some signals also having omnidirectional's characteristic from during Base Transmitter, as broadcast singal, therefore, coverage of the present invention not only comprises synchronizing signal itself, also comprises all signals should with omnidirectional's characteristic.
Single antenna is easier to obtain omnidirectional's characteristic, and multiple antennas is due to mutual interference, more difficult acquisition omnidirectional characteristic.The synchronizing signal radiation pattern being applied to multiple antennas at present mainly contains time-switching transmit diversity (TSTD), precoding vectors switches (PVS) and cyclic delay diversity (CDD).TSTD only uses 1 transmit antennas to form omnidirectional signal at synchronization, but when antenna amount is larger, it is too low to the utilance of transmitting power, cannot ensure that user obtains reliable received signal to noise ratio.PVS be not used in wave beam spatially complimentary to one another in the same time to realize covering to area of space, then needing to merge repeatedly Received signal strength, lock in time can be caused when antenna amount is larger long to obtain reliable received signal to noise ratio.CDD sends the synchronizing signal of cyclic shift each other on different antennas to ensure omnidirectional's characteristic, but can bring pseudo-multipath effect at receiving terminal, and corresponding synchronized algorithm is comparatively complicated.Therefore, existing synchronizing signal radiation pattern cannot be applicable to the more large-scale antenna array of number of transmit antennas.
Summary of the invention
The object of this invention is to provide a kind of synchronizing signal launching technique being applicable to large-scale antenna array, can realize synchronizing signal omnidirectional in the cell and cover, the user for all directions provides evenly synchronous signal receiver signal to noise ratio reliably.
The technical solution used in the present invention is: a kind of synchronizing signal launching technique being applicable to large-scale antenna array, comprises the following steps:
A, antenna for base station configure
The transmitting antenna configuration of base station side both can be traditional array antenna, also can be multi-beam antenna.No matter be which kind of antenna, its aerial array both can be one dimensional linear array, also can be two-dimensional rectangle battle array.In array, each antenna can adopt single polarization or multi-polarization antenna.The directional diagram of all antennas should be identical.
B, synchronizing signal are launched
First base station generates original synchronizing signal, and this signal can optionally be selected, and the present invention does not make any constraint to it.Generated synchronizing signal is admitted to omnidirectional signal maker together with weight vectors, and in omnidirectional signal maker, synchronizing signal, after being multiplied by weight vectors, becoming multichannel by 1 tunnel and is output, and then sends into each antenna or beam port is launched.Weight vectors can use circulation orthogonal sequence, Zadoff-Chu(ZC) sequence is exactly the one of circulation orthogonal sequence.
As weight vectors sequence should have ideal or approximate ideal cycle auto-correlation or aperiodic autocorrelation performance; to make the synchronizing signal sent from antenna, there is omnidirectional's characteristic; in addition this sequence should have permanent mould or approximate constant modulus property, can be fully utilized to make transmitter power.ZC sequence is exactly a kind of permanent mode sequence with ideal period autocorrelation performance, and it can be used as weight vectors.
C, transmit diversity
For avoiding the equivalent channel between the user of low speed movement and base station to be in deep fade for a long time, when front and back several times launch synchronizing signal, low relevant weight vectors each other can be used, to realize transmit diversity.
The present invention proposes in base station side, use circulation orthogonal sequence as weight vectors, 1 original tunnel synchronizing signal is mapped to the method for multichannel to each antenna or beam port, achieve the uniform distribution of transmitting power in all directions of space of synchronizing signal, its implementation complexity is low, weight vectors has versatility between various cell configuration scene, and avoids the problems such as the power utilization existed when conventional synchronization signal transmitting method is applied to large-scale antenna array is low, lock in time is long.
Beneficial effect: the synchronizing signal launching technique being applicable to large-scale antenna array provided by the invention, tool has the following advantages:
1, the synchronizing signal that this method is formed has omnidirectional's characteristic;
2, the computational methods of weight vectors that provide of this method, not by the restriction of antenna amount and antenna pattern, as long as antenna amount is determined, just can generate the weight vectors of a series of correspondence very simply according to given rule;
3, this method at utmost can utilize transmitting power (when using ZC sequence), can realize omnidirectional within a short period of time and cover.
Accompanying drawing explanation
The synchronizing signal launching technique diagram being applicable to large-scale antenna array that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is multi-antenna array of the present invention diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Use the synchronizing signal launching technique of large-scale antenna array as shown in Figure 1.Synchronizing signal transmitting flow process is as follows:
First base station generates original synchronizing signal.The sequence that this signal uses and baseband modulation mode (as single carrier or multi-carrier modulation) thereof can optionally be selected, and the present invention does not make any constraint to it.
Generated synchronizing signal is admitted to omnidirectional signal maker 101 together with weight vectors.The Main Function of omnidirectional signal maker 101 makes the synchronizing signal finally sent from multi-antenna array 104 have omnidirectional's characteristic.Omnidirectional signal maker 101 mainly comprises M multiplier 101-1 to 101-M.On multiplier 101-1 to 101-M, the element multiplication that synchronizing signal is corresponding with weight vectors respectively, 1 therefore original tunnel synchronizing signal is extended to M road synchronizing signal and exports.The concrete generation method of weight vectors will provide later.
The signal exported from omnidirectional signal maker 101 is admitted to sending module 102.The Main Function of sending module 102 discrete baseband signal is become analog radio-frequency signal, to send into antenna transmission.Sending module 102 mainly comprises M sendaisle 102-1 to 102-M.The control module of D/A modular converter, carrier modulation block, power amplifier module and other necessity is mainly comprised in each sendaisle.
Multiple beam forming network 103 is optional module.
When system uses array antenna, multiple beam forming network 103 does not exist, multi-antenna array 104 is directly connected with sending module 102, and now M and N is equal, and N=M input (antenna) port that the M road signal namely exported from sending module 102 is admitted to multi-antenna array 104 is launched.
And when system uses multi-beam antenna, multiple beam forming network 103 physical presence, it comprises M input (wave beam) port, corresponding to M the wave beam that multi-beam antenna can be formed, comprise N number of output port, corresponding to the N number of antenna in multi-antenna array 104, M and N can equal also can be unequal.M input (wave beam) port of multiple beam forming network 103 is admitted to from the M road signal of sending module 102 output, then export from N number of output port of multiple beam forming network 103, N number of input (antenna) port then sending into multi-antenna array 104 is launched.
Multi-antenna array 104 is configured to two-dimensional rectangle battle array, and as shown in Figure 2, its line number is N
1(N
1one dimensional linear array is deteriorated to when=1), columns is N
2, meet N=N
1× N
2.Line-spacing is equal to each other as Δ
1, row are apart from being equal to each other as Δ
2, Δ
1with Δ
2generally be no more than 1 carrier wavelength.Every root antenna is all ± 45 degree of cross polarised antennas.The directional diagram of all antennas is all identical.
When using multi-beam antenna, the wave beam that multi-beam antenna is formed in space has M, and similar with the shape of rectangle battle array, it can be divided into the M of vertical angular orientation
1the M in individual wave beam and level angle direction
2individual wave beam, meets M=M
1× M
2.When using array antenna, meet N=M, and N
1=M
1, N
2=M
2.
As can be seen from explanation above, weight vectors in omnidirectional signal maker 101 always M dimension, when using multi-beam antenna, it represents that synchronizing signal is to the weight vectors of M beam port, and when using array antenna, it represents the weight vectors of synchronizing signal to N=M antenna port.The weight coefficient w that its i-th element and multiplier 101-i use
ia kind of generating mode be
Wherein
with
being respectively length is M
1with M
2column vector, ()
hrepresent and get conjugate transpose, vec () expression carries out vectoring operations to matrix, namely
this M
1× M
2all row of dimension matrix are sequentially stacked into 1 row becomes M
1m
2× 1 that is M × 1 tie up column vector, []
irepresent the i-th row element getting column vector.Here
or
being designed to length is M
1or M
2(one dimension) ZC sequence.Length is the generation expression formula of the ZC sequence of K
Wherein γ may be selected to be and is less than K and any positive integer relatively prime with K.It should be noted that, the ZC sequence that through type (2) defines does not comprise all ZC sequences, the all sequences that the basis of formula (2) derives, if itself be permanent mode sequence, and the result of its discrete Fourier transform (DFT) (DFT) is still permanent mode sequence, all should be regarded as the one of ZC sequence.Similar, be not difficult to find what through type (1) obtained
for two-dimentional ZC sequence, itself be permanent mould, and the result of its two-dimentional DFT is also permanent mode sequence, all two-dimensional sequences that through type (1) derives also all should be regarded as the one of two-dimentional ZC sequence.
For avoiding the equivalent channel between the user of low speed movement and base station to be in deep fade for a long time, when front and back several times launch synchronizing signal, low relevant weight vectors each other can be adopted, to realize transmit diversity.Two groups of weight vectors here
with
between coefficient correlation be defined as
(3)
Wherein matrix trace is got in tr () expression.Can find,
with
between low correlation can pass through
with
or
with
between low correlation obtain, and
with
or
with
between low correlation can be obtained by the character of ZC sequence.For the ZC sequence that two length are K
with
when
meet following condition for the moment,
with
can low correlation be obtained:
A)
with
γ different;
B)
it is right to be equivalent to
carry out n cyclic shift, meet n non-zero under mould K.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each part not clear and definite in the present embodiment is realized.
Claims (1)
1. be applicable to a synchronizing signal launching technique for large-scale antenna array, it is characterized in that, comprise the following steps:
The aerial array of a, base station is one dimensional linear array or two-dimensional rectangle battle array; Described antenna adopts single polarization or multi-polarization antenna, and the directional diagram of all antennas is identical;
First b, base station generate original synchronizing signal, and use circulation orthogonal sequence, as weight vectors, original synchronizing signal is mapped to each antenna or beam port, the synchronizing signal after mapping sends through each antenna; Described circulation orthogonal sequence uses ZC sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102916735B (en) | 2012-10-17 | 2016-06-08 | 东南大学 | Utilize the wireless communications method of large-scale antenna array |
| JP6336728B2 (en) * | 2013-08-20 | 2018-06-06 | 株式会社Ｎｔｔドコモ | Synchronization signal transmission method and base station apparatus |
| CN106160776B (en) * | 2015-04-21 | 2019-06-21 | 北京信威通信技术股份有限公司 | Transmit-Receive Unit and bay mapping method and device |
| WO2017078279A1 (en) * | 2015-11-04 | 2017-05-11 | 엘지전자 주식회사 | Method for transmitting synchronization signal using codebook in wireless communication system |
| CN106160816B (en) * | 2016-06-21 | 2019-11-12 | 东南大学 | The synchronization signal and signal that perfect omnidirectional precoding is realized in extensive mimo system send and receive method |
| EP3497977B1 (en) | 2016-08-11 | 2020-08-05 | Telefonaktiebolaget LM Ericsson (PUBL) | Method and apparatus for wireless device synchronization in a beam-based communication system |
| US11108522B2 (en) | 2016-08-19 | 2021-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Distinguishing reference signals in a beam-based communication system |
| CN108092697B (en) * | 2017-05-11 | 2022-11-15 | 中兴通讯股份有限公司 | Signal transmission method and device |
| CN109660284A (en) * | 2017-10-11 | 2019-04-19 | 索尼公司 | Electronic equipment, communication means and storage medium in wireless communication system |
| CN111669210B (en) * | 2020-06-01 | 2022-08-09 | 西安交通大学 | Multi-user timing synchronization method based on large-scale antenna space-time alignment |
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| CN1352505A (en) * | 2001-12-20 | 2002-06-05 | 上海交通大学 | Method for transmitting diversity in orthogonal multiple carrier wave system |
| CN1384629A (en) * | 2001-04-30 | 2002-12-11 | 华为技术有限公司 | Code filtering down beam forming device and method for CDMA |
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| CN100353684C (en) * | 2003-11-28 | 2007-12-05 | 华为技术有限公司 | Method and apparatus for implementing omnidirectional coverage of array antennas |
| JP5320829B2 (en) * | 2008-06-09 | 2013-10-23 | 富士通株式会社 | Control channel transmission method and radio communication apparatus |
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| CN1384629A (en) * | 2001-04-30 | 2002-12-11 | 华为技术有限公司 | Code filtering down beam forming device and method for CDMA |
| CN1352505A (en) * | 2001-12-20 | 2002-06-05 | 上海交通大学 | Method for transmitting diversity in orthogonal multiple carrier wave system |
| CN101499988A (en) * | 2008-02-01 | 2009-08-05 | 大唐移动通信设备有限公司 | Wideband wireless mobile communication method, system and equipment |
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Effective date of registration: 20180827 Address after: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee after: Huawei Technologies Co., Ltd. Address before: 210096 No. four archway, 2, Jiangsu, Nanjing Patentee before: Southeast University |
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