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WO2010099660A1 - Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public - Google Patents

Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public Download PDF

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Publication number
WO2010099660A1
WO2010099660A1 PCT/CN2009/070647 CN2009070647W WO2010099660A1 WO 2010099660 A1 WO2010099660 A1 WO 2010099660A1 CN 2009070647 W CN2009070647 W CN 2009070647W WO 2010099660 A1 WO2010099660 A1 WO 2010099660A1
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WIPO (PCT)
Prior art keywords
weight
weight vector
different
common channel
phase
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Ceased
Application number
PCT/CN2009/070647
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English (en)
Chinese (zh)
Inventor
杨学志
蒋伟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2009/070647 priority Critical patent/WO2010099660A1/fr
Priority to PCT/CN2009/072141 priority patent/WO2010099674A1/fr
Priority to PCT/CN2010/070892 priority patent/WO2010099756A1/fr
Priority to US12/782,279 priority patent/US8537785B2/en
Publication of WO2010099660A1 publication Critical patent/WO2010099660A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a method and apparatus for implementing comprehensive coverage of a common channel.
  • MAS multi-antenna systems
  • SAs Smart Antennas
  • AAS Antenna Array Systems
  • a base station allocates a dedicated channel for each active user in a cell to carry voice, data or video services.
  • a smart antenna-based base station generates a narrowest beam by beamforming into a dedicated channel. The narrower the beam, the more concentrated the energy, the higher the antenna gain in the direction of the mobile terminal, and the stronger the interference suppression capability in other directions.
  • a common channel is required in the cell in addition to the dedicated channel; the common channel carries common information required by all mobile terminals in the cell, such as system information in the broadcast channel, and reference signals in the synchronization channel, Pilots, paging and common control messages in the Forward Access Channel (FACH), etc.
  • FACH Forward Access Channel
  • the dedicated channel only needs to establish a wireless link between the base station and the mobile terminal, and the transmitted signal often interferes with other base stations or mobile terminals, so the signal coverage area ( Under the premise of covering both communication parties, the smaller the better, the better; and the common channel requires all mobile terminals in the cell to receive signals at the same time, so the base station has a good overall coverage of the entire cell. Therefore, the smart antenna system must not only generate directional beams to enhance the useful signal and suppress the interference signal, but must also generate an omnidirectional beam. Provide comprehensive coverage of the cell for the common channel.
  • the embodiment of the invention provides a method and a device for realizing comprehensive coverage of a common channel, which can realize comprehensive coverage of a common channel by a smart antenna, and realize isotropic of the antenna gain, thereby realizing signal reliability received in each direction of the cell. Consistent.
  • the method for implementing comprehensive coverage of a common channel includes: acquiring a base weight vector, where the base weight vector is composed of M weight coefficients, where the M is the number of antennas; and acquiring N current common channel signal frames. Different phases, where N is the number of slots included in the common channel signal frame; transforming the basis weight vector according to the N different phases to obtain N weight vectors, the N weight vectors being different, Each of the N weight vectors includes M weight coefficients; when any one of the N time slots is reached, one of the N weight vectors is selected, and weight vectors selected by different time slots are different; The M weight coefficients in the selected weight vector respectively weight the common channel signals in the corresponding M antennas, and transmit the weighted common channel signals through the M antennas.
  • the apparatus for implementing comprehensive coverage of a common channel includes: a base weight vector acquiring unit, configured to acquire a base weight vector, where the base weight vector is composed of M weight coefficients, where the M is the number of antennas; An acquiring unit, configured to acquire N different phases of the current common channel signal frame, where N is a number of slots included in the common channel signal frame; and a transform unit, configured to acquire N different phase pairs according to the phase acquiring unit
  • the weight vector obtained by the basis weight vector obtaining unit is transformed to obtain N weight vectors, the N weight vectors are different, and the N weight vectors each comprise M weight coefficients;
  • the weight vector selecting unit is used for When any one of the N time slots is reached, one of the N weight vectors is selected, and weight vectors selected by different time slots are different; a weighting unit is used to select by using the weight vector selecting unit M weight coefficients in the weight vector respectively correspond to the corresponding M And transmitting, by the M antennas, the weighted common channel signal.
  • the embodiments of the present invention have the following beneficial effects:
  • the beam pattern is continuously changed, so that In the specified direction, the antenna gain varies randomly with time, so the average value of the gain exhibits isotropic, so that the reliability of signals received in all directions in the cell is consistent.
  • FIG. 1 is a flowchart of a method for implementing comprehensive coverage of a common channel in an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an apparatus for implementing full coverage of a common channel according to an embodiment of the present invention
  • FIG. 4 is another schematic diagram of an apparatus for implementing full coverage of a common channel according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an apparatus for implementing full coverage of a common channel according to an embodiment of the present invention
  • FIG. 4 is another schematic diagram of an apparatus for implementing full coverage of a common channel according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a simulation experiment in an embodiment of the present invention.
  • the embodiment of the invention provides a method and a device for realizing comprehensive coverage of a common channel, which can realize comprehensive coverage of a common channel by a smart antenna, and realize isotropic of the antenna gain, thereby realizing signal reliability received in each direction of the cell. Consistent.
  • the basis weight vector is composed of M weight coefficients, the M is the number of antennas; acquiring N different phases of the current common channel signal frame, where N is a time slot included in the common channel signal frame Number
  • the beam pattern is changed so that the antenna gain varies randomly with time in a specified direction, so the average value of the gain exhibits isotropic, so that the reliability of signals received in all directions in the cell is consistent.
  • the method for realizing the comprehensive coverage of the common channel in the embodiment of the present invention includes:
  • the transmission time of the common channel signal is first divided into frames, and then each frame is divided into N time slots.
  • a base weight vector [ Wl w 2 ... w M ] T is first designed, and the basis weight vector is
  • the coverage angle of the beam generated by the weight vector beamforming should reach a preset threshold, and the beam flatness should be higher than the preset threshold in the angular dimension, that is, the peak-to-average ratio is lower than the preset threshold, that is, the beam It should have the characteristics of wide coverage angle, flat beam, and low peak-to-average ratio.
  • the transmit power of each antenna can be required to be equal, that is, the modulus of each weight coefficient in the basis weight vector is equal,
  • N different phases are obtained, which respectively correspond to N time slots in the current frame.
  • one phase may be selected from [0, 2 ⁇ ] according to a certain criterion, and the selected phase transformations are generated.
  • the weight vector beam pattern should be complementary, and the average antenna gain in different directions in the cell should be equalized as much as possible.
  • the computer can search or test multiple times to find the phase that meets the requirements. For example, software such as MATLAB can be used. Select the desired phase from 0 to 2 ⁇ .
  • the base weight vector can be transformed according to each phase to obtain one weight vector corresponding to one time slot, specifically:
  • any one of the weight vectors is selected.
  • the weight vectors may be calculated according to the phase and the weight vector, and the weight vectors are different. And corresponding to one time slot, when a certain time slot is reached, one of the weight vectors may be selected, and the specific selection method may be:
  • one of the weight vectors is selected in order, for example, the first time slot selects the first weight vector, the second time slot selects the second weight vector, and so on.
  • each weight vector can only be selected once. And each weight vector needs to be selected.
  • the common channel signal is weighted, and the beam shaping is performed according to the weight vector, so the beam pattern of the time slot is:
  • the beam pattern can still maintain the characteristics of wide coverage angle, flat beam, and low peak-to-average ratio.
  • the beam pattern is rotated by o. It should be noted that the rotation described here is described. It does not mean that the beam pattern is simply rotated by a certain angle, but by the rotation of the weight vector phase, the beam pattern is changed in shape.
  • the beam generated by the weight vector has a wide coverage angle, a flat beam, and a low peak-to-average ratio.
  • the beam pattern of the basis weight vector has lower gains around 30°, 150°, 210°, and 330°, and high gains around 15°, 165°, 225°, and 315°.
  • the beam pattern of the new weight vector 0 is shown by the dotted line 202 in Fig. 2; the beam generated by the new weight vector still satisfies the wide coverage angle and beam Flat, low peak-to-average ratio.
  • the beam pattern generated by the new weight vector has a high gain around 30°, 150°, 210°, 330°, and a low gain near 15°, 165°, 225°, 315°. It can be seen that the two beam patterns are complementary. For a given direction, the high and low gains of the array antenna alternately appear. Through channel coding and interleaving techniques, the overall coverage of the common channel can be achieved.
  • the weighted common channel signal is transmitted through the M antennas, and the common channel signals of the N time slots in the current frame are sequentially transmitted in order.
  • the antenna element and the low power amplifier group existing in the smart antenna system are fully utilized, and a basis weight vector is selected to generate a beam with a wide coverage angle, a flat beam, and a low peak-to-average ratio, with a random phase pair.
  • the basis weight vector is transformed to continuously change the beam pattern. In the specified direction, the antenna gain varies randomly with time, so the average of the gains exhibits isotropic.
  • a common channel signal of one frame can be transmitted, and full coverage of the common channel is implemented, but if the common channel signal is more than one frame, the common channel signal of the next frame needs to be continuously transmitted, due to the weight vector.
  • the larger the number the stronger the average isotropic of the antenna gain. Therefore, in order to further improve the isotropic nature of the antenna gain average, different N weight vectors can be used in different frames instead of simply repeating the previous one. The weight vector of the frame.
  • an inter-frame incremental phase value may be preset, and N different weight vectors of the current frame may be updated by using the inter-frame incremental phase value to obtain N different second weight vectors, which may be in the next frame.
  • the N second weight vectors are used.
  • the inter-frame incremental phase values may be respectively added to the N weight vectors of the current frame to obtain N second weight vectors.
  • the transmission time of the cell common channel signal based on the smart antenna system is divided into consecutive time frames, each frame is divided into N time slots, and each time slot includes L modulation symbols.
  • the nth slot of the kth frame is denoted by ⁇ , and the slot length is less than the channel correlation time, i.e., the channel fading experienced by all L symbols in each slot is constant.
  • the basis weight vector w [ Wl w 2 ... w M ] T is determined .
  • the beam generated by the weight vector beamforming should have a wide coverage angle, a flat beam, and a low peak-to-average ratio.
  • the weight vector beam pattern generated after the transformation of the selected N phase values should be complementary, as much as possible
  • the average antenna gains in different directions in the cell are equal, and a computer search or multiple test methods can be used to find a phase that satisfies the requirements.
  • a specified direction in the cell if the antenna gain in a certain slot If the value is lower, then the gain will be higher in some other time slots in the same frame.
  • the low gain of the time slot experiencing the beam pattern is equivalent to the deep fading of the channel in the BER performance, which can be obtained by channel coding and interleaving techniques. Eliminate the effects of.
  • Each time slot of the +1 frame is selected in accordance with the same method as the above-mentioned first frame, and each phase value is selected, and then transformed, and the new weight vector beam generated by the transform is used for beamforming.
  • the antenna element and the low power amplifier group existing in the smart antenna system are fully utilized, and a basis weight vector is selected to generate a beam with a wide coverage angle, a flat beam, and a low peak-to-average ratio, with a random phase pair.
  • the basis weight vector is transformed to continuously change the beam pattern. In the specified direction, the antenna gain varies randomly with time, so the average of the gains exhibits isotropic.
  • the device for realizing the comprehensive coverage of the common channel in the embodiment of the present invention is specifically located in the base station. Referring to FIG. 3, the implementation of the common channel in the embodiment of the present invention is complete.
  • One embodiment of a face covering device includes:
  • the base weight vector obtaining unit 301 is configured to obtain a base weight vector, where the base weight vector is composed of M weight coefficients, where the M is the number of antennas;
  • the phase obtaining unit 302 is configured to acquire N different phases of the current common channel signal frame, where N is the number of slots included in the common channel signal frame;
  • the transform unit 303 is configured to perform, according to the N different phases acquired by the phase acquiring unit 302, the base weight vector acquired by the basis weight vector acquiring unit 301 to obtain N weight vectors, where the N weight vectors are different.
  • Each of the N weight vectors includes M weight coefficients;
  • the weight vector selection unit 304 is configured to: when any one of the N time slots is reached, select one of the N weight vectors, and the weight vectors selected by different time slots are different;
  • the weighting unit 305 is configured to weight the common channel signals in the corresponding M antennas by using the M weight coefficients in the weight vector selected by the weight vector selecting unit 304;
  • the sending unit 306 is configured to send the weighted common channel signal by using M antennas.
  • M antennas For ease of understanding, the following describes an apparatus for implementing comprehensive coverage of a common channel in the embodiment of the present invention. Referring to FIG. 4, another embodiment of the apparatus for implementing comprehensive coverage of a common channel in the embodiment of the present invention includes:
  • a dividing unit 401 configured to divide each frame in a transmission time of the common channel signal into N time slots;
  • the base weight vector obtaining unit 402 is configured to obtain a base weight vector, where the base weight vector is composed of M weight coefficients, where the M is the number of antennas;
  • phase acquisition unit 403 configured to acquire N different phases
  • the transform unit 404 is configured to transform, according to each phase acquired by the phase acquiring unit 403, the base weight vector acquired by the basis weight vector obtaining unit 402 to obtain N weight vectors, where the N weight vectors are different.
  • Each of the N weight vectors includes M weight coefficients;
  • the weight vector selection unit 405 is configured to select any one of the N weight vectors when the any one of the N time slots is reached, and the weight vectors selected by the different time slots are different;
  • the weighting unit 406 is configured to weight the common channel signals in the corresponding M antennas by using the M weight coefficients in the weight vector selected by the weight vector selecting unit;
  • a sending unit 407 configured to send, by using the M antennas, the weighted common channel signal number.
  • the apparatus in this embodiment may further include:
  • An incremental acquisition unit 408, configured to acquire a preset inter-frame incremental phase value
  • the phase updating unit 409 is configured to update the N phases acquired by the phase acquiring unit 403 according to the inter-frame incremental phase value acquired by the incremental acquiring unit 408 to obtain N second phases, and indicate the transforming unit 404. Transforming the N basis weight vectors according to the N second phases to obtain N weight vectors.
  • the weight vector selection unit 405 in this embodiment may further include:
  • a sequence selecting unit 4051 configured to sequentially select corresponding weight vectors of the N weights according to a sequence of N time slots
  • the random selection unit 4052 is configured to randomly select one weight vector from the N weight vectors according to the sequence of N time slots, and the weight vectors selected in different time slots are different.
  • the basis weight vector obtaining unit 402 selects a basis weight vector to generate a beam having a wide coverage angle, a flat beam, and a low peak-to-average ratio
  • the phase acquiring unit 403 acquires the phase, and the phase is obtained by the transform unit 404 with a random phase.
  • the weight vector is transformed to continuously change the beam pattern.
  • the antenna gain varies randomly with time, so the average of the gains exhibits isotropic.
  • This embodiment implements the antenna gain isotropic of the full coverage of the smart antenna.
  • the beam direction of the weight vector can be obtained.
  • the beam pattern of the base weight vector covers most of the angles. , the beam is flat, and the peak-to-average ratio is low.
  • FIG. 5 is a transceiver system according to an embodiment of the present invention. After a common channel signal passes through a code modulation unit 501 at a transmitting end, a symbol partition is obtained, and each block includes one modulation symbol, represented by a vector d.
  • the framing is performed by the framing unit 502, and then the beamforming unit 503 is used for beamforming.
  • the OFDM modulation unit 504 can perform orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division Multiple).
  • OFDM Orthogonal Frequency Division Multiple
  • the received signal can be expressed as:
  • H is the channel response matrix, if the channel is a single-path channel, such as a narrow-band signal in a Time Division Multiple Access (TDMA) system, Or an Orthogonal Frequency Division Multiple Access (OFDMA) system, where the channel response matrix is a diagonal matrix:
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the beamforming gain matrix is denoted as G and is determined by the beam pattern in the specified direction.
  • the beam-forming antenna gain of N weight vectors used in N time slots can be calculated by the following formula:
  • matrix A is used to represent the product of matrices G and H, and A is also a diagonal matrix.
  • the transmitted data symbols can be demodulated by a typical minimum mean square error (MMSE) algorithm, and the specific demodulation algorithm is as follows:
  • MMSE minimum mean square error
  • the method for omnidirectional coverage of the common channel of the cell based on the smart antenna proposed by the embodiment of the present invention is simulated on the MATLAB/Simulink platform, and the selected simulation parameters are all defined in the actual communication system or defined in the standard, as shown in the following table.
  • Source Bernoulli binary source 0 and 1 distribution, output bit rate 1 Mbps, simulation frame length 288 bits
  • the convolutional code defined in the WiMAX (IEEE 802.16e) standard is also selected. (CC), code rate 1/2, constraint length equal to 7, octal coding polynomial is [133 171], Viterbi decoding
  • Modulation 4-QAM QPSK
  • Gray mapping with LDPC code
  • demodulator soft
  • Log-Likelihood Ratio when using convolutional code, the demodulator adopts hard decision
  • the single antenna and the smart antenna omnidirectional beam are simulated.
  • Each scheme adopts LDPC code and convolutional code, and four sets of simulations are used.
  • curve 601 is a performance curve when a single antenna adopts a convolutional code
  • curve 602 is a performance curve when a smart antenna omnidirectional beam adopts a convolutional code
  • curve 603 is a performance curve when a single antenna adopts an LDPC code
  • curve 604 is an intelligent curve. The performance curve when the omnidirectional beam of the antenna adopts the LDPC code.
  • the simulation experiment a plurality of different receiving angles of the cell are randomly selected.
  • the simulation results show that the reliability of the received signals in different directions in the cell is completely consistent, and there is no correlation with the channel coding, which proves that the smart antenna array is omnidirectional in the embodiment of the present invention. Covered isotropic.
  • the BER performance of the omnidirectional beam of the smart antenna is only 1 ⁇ 2 dB of the received signal power signal-to-noise ratio (SNR) loss of a single antenna.
  • SNR signal-to-noise ratio
  • the received signal SNR loss is about 2 dB compared to the reliability of a single antenna.
  • the signal-to-noise ratio difference between the single antenna and the smart antenna omnidirectional beam is only 1 dB.
  • the omnidirectional beamforming algorithm in the smart antenna array system proposed by the embodiment of the present invention can provide good omnidirectional coverage for the common channel of the cell.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un procédé de mise en œuvre d'une couverture omnidirectionnelle pour un canal public comprenant : l'obtention d'un vecteur de pondération fondamental qui est composé de M coefficients de pondération, M étant le nombre d'antennes; l'obtention de N phases différentes de la trame de signal de canal public actuel, N étant le nombre d'intervalles temporels contenus dans une trame de signal de canal public; l'obtention de N vecteurs de pondération par la transformation du vecteur de pondération fondamental selon les N phases différentes, les N vecteurs de pondération étant différents et chacun des N vecteurs de pondération contenant M coefficients de pondération; lorsque l'un quelconque dans les N intervalles temporels est atteint, la sélection d'un des N vecteurs de pondération, le vecteur sélectionné se distinguant de chaque autre dans les différents intervalles temporels; la pondération des signaux de canal public dans les M antennes correspondantes avec les M coefficients de pondération contenus dans le vecteur de pondération sélectionné respectivement; et la transmission des signaux pondérés de canal public par les M antennes. De plus, l'invention concerne un dispositif de mise en œuvre d'une couverture omnidirectionnelle pour un canal public.
PCT/CN2009/070647 2009-03-05 2009-03-05 Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public Ceased WO2010099660A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/CN2009/070647 WO2010099660A1 (fr) 2009-03-05 2009-03-05 Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public
PCT/CN2009/072141 WO2010099674A1 (fr) 2009-03-05 2009-06-05 Procédé et appareil de mise en oeuvre d'une couverture de canal public par des antennes multiples
PCT/CN2010/070892 WO2010099756A1 (fr) 2009-03-05 2010-03-05 Procédé et appareil de mise en oeuvre d'une couverture de canal commun par des antennes multiples
US12/782,279 US8537785B2 (en) 2009-03-05 2010-05-18 Method and apparatus for cell/sector coverage of a public channel through multiple antennas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2009/070647 WO2010099660A1 (fr) 2009-03-05 2009-03-05 Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public

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WO2010099660A1 true WO2010099660A1 (fr) 2010-09-10

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PCT/CN2009/070647 Ceased WO2010099660A1 (fr) 2009-03-05 2009-03-05 Procédé et dispositif de mise en oeuvre d'une couverture omnidirectionnelle pour un canal public
PCT/CN2009/072141 Ceased WO2010099674A1 (fr) 2009-03-05 2009-06-05 Procédé et appareil de mise en oeuvre d'une couverture de canal public par des antennes multiples
PCT/CN2010/070892 Ceased WO2010099756A1 (fr) 2009-03-05 2010-03-05 Procédé et appareil de mise en oeuvre d'une couverture de canal commun par des antennes multiples

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PCT/CN2009/072141 Ceased WO2010099674A1 (fr) 2009-03-05 2009-06-05 Procédé et appareil de mise en oeuvre d'une couverture de canal public par des antennes multiples
PCT/CN2010/070892 Ceased WO2010099756A1 (fr) 2009-03-05 2010-03-05 Procédé et appareil de mise en oeuvre d'une couverture de canal commun par des antennes multiples

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1622490A (zh) * 2003-11-28 2005-06-01 华为技术有限公司 阵列天线实现全向覆盖的方法与装置
CN101304278A (zh) * 2008-06-30 2008-11-12 中国移动通信集团设计院有限公司 一种采用多阵元天线的基站小区覆盖方法
CN101335553A (zh) * 2007-06-26 2008-12-31 中兴通讯股份有限公司 一种天线阵列实现广播信道覆盖的方法及装置

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Publication number Priority date Publication date Assignee Title
US6154661A (en) * 1997-12-10 2000-11-28 Arraycomm, Inc. Transmitting on the downlink using one or more weight vectors determined to achieve a desired radiation pattern
US9106296B2 (en) * 2006-12-19 2015-08-11 Qualcomm Incorporated Beam space time coding and transmit diversity

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1622490A (zh) * 2003-11-28 2005-06-01 华为技术有限公司 阵列天线实现全向覆盖的方法与装置
CN101335553A (zh) * 2007-06-26 2008-12-31 中兴通讯股份有限公司 一种天线阵列实现广播信道覆盖的方法及装置
CN101304278A (zh) * 2008-06-30 2008-11-12 中国移动通信集团设计院有限公司 一种采用多阵元天线的基站小区覆盖方法

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