WO2001001582A2 - Antennes sectorielle et adaptative integrees - Google Patents

Antennes sectorielle et adaptative integrees Download PDF

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Publication number
WO2001001582A2
WO2001001582A2 PCT/IB2000/001639 IB0001639W WO0101582A2 WO 2001001582 A2 WO2001001582 A2 WO 2001001582A2 IB 0001639 W IB0001639 W IB 0001639W WO 0101582 A2 WO0101582 A2 WO 0101582A2
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
phased
sector
array
adaptive
Prior art date
Application number
PCT/IB2000/001639
Other languages
English (en)
Other versions
WO2001001582A3 (fr
Inventor
Bjorn Johannisson
Bo Hagerman
Thomas Ostman
Gunnar Monell
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU11679/01A priority Critical patent/AU1167901A/en
Publication of WO2001001582A2 publication Critical patent/WO2001001582A2/fr
Publication of WO2001001582A3 publication Critical patent/WO2001001582A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/002—Antennas or antenna systems providing at least two radiating patterns providing at least two patterns of different beamwidth; Variable beamwidth antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • 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
    • H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity

Definitions

  • the present invention relates the field of cellular, radio telecommunications. More particularly, the present invention relates to cellular, radio telecommunications systems which employ both sector antennas and adaptive, phased-array antennas.
  • FIG. 1 illustrates a conventional, cellular radio telecommunications system 100. As shown, it includes a number of radio base stations 105a-n, each of which is connected to a corresponding base station antenna 1 lOa-n.
  • the radio base stations 105a-n in conjunction with antennas 1 lOa-n, communicate with mobile stations (e.g. , mobile stations 120a, 120b and 120m) operating in a corresponding 130a-n. Radio communication from a base station to a mobile station is referred to as the downlink, whereas radio communication from a mobile station to a base station is referred to as the uplink.
  • the base stations 105a-n are connected to a mobile switching center (MSC) 150.
  • the MSC 150 is connected to a public switched telephone network (PSTN) 160, which services various communication devices such as telephones 180a, personal computers 180b, and facsimile machines 180c.
  • PSTN public switched telephone network
  • each base station 130a-n is connected to a corresponding base station antenna 1 lOa-n, through which, the base stations communicate with mobile stations.
  • each antenna may comprise several sector antennas.
  • a sector antenna is designed to transmit and receive radio energy to and from a particular geographic region or sector within a corresponding cell. By restricting the sector antenna to a particular sector, interference emanating from sources located outside the sector is minimized. This, in turn, improves the signal quality between the base station and the mobile stations operating in that sector of the cell.
  • a base station may employ three sector antennas, each covering one of three 120 degree sectors, as illustrated in FIG. 2A.
  • a base station may employ six sector antennas, each covering one of six 60 degree sectors, as illustrated in FIG. 2B.
  • FIG. 2C shows an exemplary antenna pattern 200 for a fixed-beam, phased-array antenna associated with a base station 205, wherein the exemplary antenna pattern 200 comprises a number of narrow antenna beams B, through B m .
  • FIG. 2C also illustrates that each of the antenna beams Bj through B m remains fixed, whether or not a mobile station is operating in the corresponding sector of the cell.
  • FIG. 2D illustrates an exemplary antenna pattern 240 associated with an adaptive, phased-array antenna 250, wherein antenna pattern 240 comprises only two antenna beams b, and b 2 which are employed for point-to-point communication with the two mobile stations A and B.
  • antenna pattern 240 comprises only two antenna beams b, and b 2 which are employed for point-to-point communication with the two mobile stations A and B.
  • 2D shows that the amount of radio energy propagated into the cell by the base station can be significantly reduced by employing adaptive, phased-array antennas.
  • adaptive, phased-array antennas are well-known in the art.
  • a base station may employ sector antennas and adaptive, phased-array antennas simultaneously.
  • the sector antennas are used for broadcasting control channel signals throughout the entire cell, whereas the adaptive, phased-array antennas are used for selective, point-to-point traffic channel communication, as illustrated in FIG. 2D.
  • the sector antenna is, typically, disposed in a first cartridge, while the phased array antenna is disposed in a second, separate cartridge, wherein the first and the second cartridges are located some distance apart from each other as a function of wavelength.
  • This arrangement is not desirable.
  • disposing the sector antenna and the phased-array antenna in separate cartridges takes up a great deal of space.
  • Second, such an arrangement is costly, as two rather than one cartridge must be manufactured and installed.
  • much of the hardware required to support the sector antenna and the phased-array antenna is duplicated. Accordingly, it would be highly desirable to provide both a mechanical and electrical solution to facilitate the co-location of a sector antenna and a phased-array antenna, particularly an adaptive, phased-array antenna, in a single antenna cartridge.
  • the present invention combines a sector antenna and a phased-array antenna into a single, integrated unit. In doing so, space is conserved and the base station antenna is generally more aesthetically pleasing. In addition, this antenna arrangement is less costly to manufacture, install and maintain as there is one antenna cartridge rather than two, and because both the sector antenna and the phased-array antenna may be supported by a single radio transceiver. Further, one antenna cartridge makes it possible for integrating common switch matrixes and amplifier structures connected to both the array and the sector antenna.
  • an antenna arrangement wherein a sector antenna and a phased-array antenna are housed within a single antenna cartridge, such that the sector antenna is positioned immediately adjacent to the phased-array antenna.
  • an antenna arrangement wherein a sector antenna and a phase-array antenna are housed within a single antenna cartridge, such that the sector antenna and the phased-array antenna share at least one radiating element.
  • an antenna arrangement wherein a sector antenna, a phased-array antenna, a transmit switch matrix and a receive switch matrix are housed within a single antenna cartridge, such that the sector antenna is positioned immediately adjacent to the phased-array antenna.
  • an antenna arrangement wherein a sector antenna, a phased-array antenna and a transmit amplifier array are housed within a single antenna cartridge, such that the sector antenna is positioned immediately adjacent to the phased-array antenna.
  • an antenna arrangement is provided wherein a sector antenna, a phased-array antenna, transmit and receive switch matrices and a transmit amplifier array are housed within a single antenna cartridge, such that the sector antenna is positioned immediately adjacent to the phased-array antenna.
  • FIG. 1 illustrates a conventional cellular radio telecommunications network
  • FIGs. 2A-D illustrate exemplary base station antenna patterns
  • FIG. 3 illustrates a conventional antenna arrangement for a sector antenna and an adaptive, phased-array antenna
  • FIG. 4 illustrates a sector antenna and adaptive, phased-array antenna arrangement, in accordance with a first exemplary embodiment of the present invention
  • FIG. 5 is a block diagram of the antenna arrangement in accordance with the first exemplary embodiment of the present invention
  • FIG. 6 illustrates a sector antenna and adaptive, phased-array antenna arrangement, in accordance with a second exemplary embodiment of the present invention
  • FIGs. 7A and B are block diagrams of the antenna arrangement in accordance with the second exemplary embodiment of the present invention.
  • FIG. 8 illustrates a transceiver unit and switching configuration in accordance with exemplary embodiments of the present invention
  • FIGs. 9A-D illustrate exemplary antenna cross sections for increased isolation and improved radiation characteristics
  • FIG. 10 is a block diagram of an antenna arrangement in accordance with the third exemplary embodiment of the present invention.
  • FIG. 11 is a block diagram of the antenna arrangement in accordance with the fourth exemplary embodiment of the present invention.
  • FIG.12 is a block diagram of the antenna arrangement in accordance with the preferred embodiment of the present invention.
  • the base station includes both a sector antenna, for broadcasting control channel signals, and an adaptive, phased-array antenna, for broadcasting point-to-point traffic channel communications.
  • the sector antenna and the adaptive, phased-array antenna are disposed in separate units or cartridges, which are located a sufficient distance from each other, as illustrated in Fig. 3.
  • the present invention integrates the sector antenna and the adaptive, phased-array antenna into a single unit or cartridge. In so doing, the above- identified deficiencies associated with conventional configurations are avoided. Of course, there are different ways in which to integrate the two antennas within a single antenna cartridge.
  • Fig. 4 depicts a first exemplary embodiment of the present invention. As shown, the sector antenna is located immediately adjacent to the adaptive, phased- array antenna. Although the two antennas are enclosed within a single common radome, they are functionally separate.
  • Fig. 5 is a block diagram which illustrates this first exemplary embodiment.
  • the sector antenna and the adaptive, phased-array antenna are located immediately adjacent to one another, the mutual effect between the two antennas may be considerable.
  • a portion of that power may be coupled to the radiating elements associated with the other antenna, whereby the antenna pattern associated with one of the antennas affects the other. Accordingly, it is necessary to control this coupling. This may be accomplished by adjusting the position of the individual radiating elements (e.g. , dipoles or microstrip patches) that make up the sector antenna and the adaptive, phased-array antenna as illustrated in FIG 9D.
  • a partition such as a metal divider, or a choke may be placed between the sector antenna and the adaptive, phased-array antenna, as illustrated in FIGs 9A-C.
  • Fig. 6 depicts a second exemplary embodiment of the present invention. As shown, the sector antenna is physically incorporated into the adaptive, phased- array antenna. A difference between this embodiment and the previous embodiment is that the sector antenna and the adaptive, phased-array antenna share the power, which results in lower power gain.
  • the left-most column of elements serves both the sector antenna and the adaptive, phased-array antenna.
  • any of the array columns may be shared. From the vantage point of the sector antenna, however, employing one of the center-most columns would be preferable, as any influence on the sector antenna pattern will be symmetric in the azimuth plane.
  • the antenna pattern associated with the adaptive, phased-array antenna is more likely to be distorted.
  • Choosing one column of elements in the array over another column of elements will, of course, depend on system performance requirements.
  • Fig. 7 A is a block diagram illustrating this second exemplary embodiment.
  • Fig. 7B illustrates a block diagram of an antenna arrangement using common radiating elements for two sector beam ports.
  • Fig. 8 illustrates a sector antenna 805 and an adaptive, phased-array antenna 810 set immediately adjacent to one another in accordance with the first exemplary embodiment described above, wherein the sector antenna 805 and the adaptive, phased-array antenna 810, along with beam forming unit 815, which may comprise a conventional beam former, such as a butler matrix, are supported by a single transceiver unit 820, a transmit switch 825 and a receive switch 830.
  • beam forming unit 815 which may comprise a conventional beam former, such as a butler matrix
  • the sector antenna 805 and each element of the adaptive, phased-array antenna 810 may be connected to one or more of the radio transmitters 835 and radio receivers 840 through transmit switch 825 and receive switch 830, respectively.
  • the transmit switch 825 and the receive switch 830 are utilized by the transceiver unit 420 to selectively assign resources to either or both the sector antenna 805 and the adaptive, phased-array antenna 810 under the supervision of a control unit 845.
  • the transceiver unit 820 along with sector antenna 805 and the adaptive, phased-array antenna 810 are readily configurable through the use of the transmit switch 825 and the receive switch 830.
  • the configuration is significantly more flexible, as compared to conventional designs, wherein each antenna is served by a dedicated transceiver unit.
  • FIG. 10 depicts a third exemplary embodiment of the present invention. As shown, a sector antenna 1020 and an adaptive, phased-array antenna 1030, which are set immediately adjacent to one another, a beamformer unit 1040, a transmit switch matrix 1050 and a receive switch matrix 1060 are all located within the antenna enclosure 1010.
  • FIG. 11 depicts a fourth exemplary embodiment of the present invention.
  • a sector antenna 1020 and an adaptive, phased-array antenna 1030 which are set immediately adjacent to one another, a beamformer unit 1040, and a transmit amplifier array 1070 are all located within the antenna enclosure 1010.
  • the transmit amplifier array 1070 contains a first hybrid matrix for spreading an amount of transmit power associated with a given transmit feeder port across each of the plurality of multi-carrier power (MCP) amplifiers, and a second hybrid matrix for combining each amplified output signal associated with the plurality of multi-carrier amplifiers and forwarding the combined signal to the corresponding antenna port.
  • MCP multi-carrier power
  • FIG. 12 depicts a fifth and preferred embodiment of the present invention.
  • a sector antenna 1020 and an adaptive, phased-array antenna 1030 which are set immediately adjacent to one another, a beamformer unit 1040, a transmit switch matrix 1050, a receive switch matrix 1060, low noise amplifiers 1080 and transmit amplifier array 1070 are all located within the antenna enclosure 1010.
  • the integration of the sector antenna and the adaptive, phased-array antenna, the transmit and receive switch matrices and the transmit amplifier array into a single antenna cartridge provides many advantages. In addition to the configuration facilitating the use of a single transceiver unit in support of both antennas, it reduces transmit power requirements, provides flexibility in feeder cable selection, and it reduces power loss due to the close proximity of the amplifier array with the radiating elements.

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

Abstract

Il est possible de réduire, de manière significative, l'espace physique disponible pour installer des antennes sectorielle et réseau à commande de phase adaptative au niveau d'une station de base de télécommunications radio cellulaire, ainsi que les coûts associés à leur fabrication, leur installation, et à leur maintenance par incorporation desdites antennes sectorielle et réseau à commande de phase dans une seule cartouche d'antenne. De ce fait, les deux antennes peuvent être supportées par une seule unité d'émetteur-récepteur radio.
PCT/IB2000/001639 1999-04-29 2000-04-28 Antennes sectorielle et adaptative integrees WO2001001582A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11679/01A AU1167901A (en) 1999-04-29 2000-04-28 Integrated adaptive and sector antennas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13158999P 1999-04-29 1999-04-29
US60/131,589 1999-04-29

Publications (2)

Publication Number Publication Date
WO2001001582A2 true WO2001001582A2 (fr) 2001-01-04
WO2001001582A3 WO2001001582A3 (fr) 2001-08-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/001639 WO2001001582A2 (fr) 1999-04-29 2000-04-28 Antennes sectorielle et adaptative integrees

Country Status (2)

Country Link
AU (1) AU1167901A (fr)
WO (1) WO2001001582A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10110256A1 (de) * 2001-03-02 2002-09-19 Siemens Ag Antennenkombiniervorrichtung für "intelligente" Antennen
EP1337122A1 (fr) * 2002-02-14 2003-08-20 NTT DoCoMo, Inc. Agencement d'éléments directionnels d'une antenne sectorisée pour réaliser un reseau d'antennes adaptatives
WO2006078967A2 (fr) * 2005-01-21 2006-07-27 Rotani, Inc. Procede et appareil pour un module d'antenne
WO2007025568A1 (fr) * 2005-08-30 2007-03-08 Telefonaktiebolaget L M Ericsson (Publ) Systèmes et procédés destinés à une antenne de secteur multimode reconfigurable
CN104577356A (zh) * 2013-10-12 2015-04-29 华为技术有限公司 天线***和基站
US9496930B2 (en) 2006-02-28 2016-11-15 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
WO2018067045A1 (fr) * 2016-10-05 2018-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Système d'antenne pour transmission double

Citations (9)

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Publication number Priority date Publication date Assignee Title
US3803625A (en) * 1972-12-18 1974-04-09 Itt Network approach for reducing the number of phase shifters in a limited scan phased array
EP0668627A1 (fr) * 1994-02-16 1995-08-23 Northern Telecom Limited Dispositif d'antenne pour station de base
EP0715478A2 (fr) * 1994-11-28 1996-06-05 Texas Instruments Inc. Système de communication point à multipoint à faible portée et à faible puissance
US5548813A (en) * 1994-03-24 1996-08-20 Ericsson Inc. Phased array cellular base station and associated methods for enhanced power efficiency
US5684491A (en) * 1995-01-27 1997-11-04 Hazeltine Corporation High gain antenna systems for cellular use
WO1998042150A2 (fr) * 1997-03-14 1998-09-24 At & T Corp. Antennes de liaison descendante intelligentes pour systemes amrt is-54/is136
EP0895436A2 (fr) * 1997-07-31 1999-02-03 Nortel Networks Corporation Combination d'un réseau d'antennes à faisceaux multiples et à couverture de secteurs
WO1999052311A1 (fr) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Procede et systeme de manipulation de signaux radio dans une station de base radio
EP0980111A1 (fr) * 1998-05-20 2000-02-16 Libertel N.V. Dispositif d'antenne pour station fixe d'un réseau de télécommunication mobile

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803625A (en) * 1972-12-18 1974-04-09 Itt Network approach for reducing the number of phase shifters in a limited scan phased array
EP0668627A1 (fr) * 1994-02-16 1995-08-23 Northern Telecom Limited Dispositif d'antenne pour station de base
US5548813A (en) * 1994-03-24 1996-08-20 Ericsson Inc. Phased array cellular base station and associated methods for enhanced power efficiency
EP0715478A2 (fr) * 1994-11-28 1996-06-05 Texas Instruments Inc. Système de communication point à multipoint à faible portée et à faible puissance
US5684491A (en) * 1995-01-27 1997-11-04 Hazeltine Corporation High gain antenna systems for cellular use
WO1998042150A2 (fr) * 1997-03-14 1998-09-24 At & T Corp. Antennes de liaison descendante intelligentes pour systemes amrt is-54/is136
EP0895436A2 (fr) * 1997-07-31 1999-02-03 Nortel Networks Corporation Combination d'un réseau d'antennes à faisceaux multiples et à couverture de secteurs
WO1999052311A1 (fr) * 1998-04-03 1999-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Procede et systeme de manipulation de signaux radio dans une station de base radio
EP0980111A1 (fr) * 1998-05-20 2000-02-16 Libertel N.V. Dispositif d'antenne pour station fixe d'un réseau de télécommunication mobile

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10110256A1 (de) * 2001-03-02 2002-09-19 Siemens Ag Antennenkombiniervorrichtung für "intelligente" Antennen
DE10110256C2 (de) * 2001-03-02 2003-06-18 Siemens Ag Antennenkombiniervorrichtung für "intelligente" Antennen
EP1337122A1 (fr) * 2002-02-14 2003-08-20 NTT DoCoMo, Inc. Agencement d'éléments directionnels d'une antenne sectorisée pour réaliser un reseau d'antennes adaptatives
US7149548B2 (en) 2002-02-14 2006-12-12 Ntt Docomo, Inc. Antenna apparatus for base station and method of optimizing traffic capacity in CDMA communications system
WO2006078967A2 (fr) * 2005-01-21 2006-07-27 Rotani, Inc. Procede et appareil pour un module d'antenne
WO2006078967A3 (fr) * 2005-01-21 2006-12-07 Rotani Inc Procede et appareil pour un module d'antenne
WO2007025568A1 (fr) * 2005-08-30 2007-03-08 Telefonaktiebolaget L M Ericsson (Publ) Systèmes et procédés destinés à une antenne de secteur multimode reconfigurable
US9496931B2 (en) 2006-02-28 2016-11-15 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US10069548B2 (en) 2006-02-28 2018-09-04 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US9496930B2 (en) 2006-02-28 2016-11-15 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US12015457B2 (en) 2006-02-28 2024-06-18 Woodbury Wireless, LLC MIMO methods and systems
US9503163B2 (en) 2006-02-28 2016-11-22 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US9525468B2 (en) 2006-02-28 2016-12-20 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US9584197B2 (en) 2006-02-28 2017-02-28 Woodbury Wireless, LLC Methods and apparatus for overlapping MIMO physical sectors
US11108443B2 (en) 2006-02-28 2021-08-31 Woodbury Wireless, LLC MIMO methods and systems
US10516451B2 (en) 2006-02-28 2019-12-24 Woodbury Wireless Llc MIMO methods
US10063297B1 (en) 2006-02-28 2018-08-28 Woodbury Wireless, LLC MIMO methods and systems
US10211895B2 (en) 2006-02-28 2019-02-19 Woodbury Wireless Llc MIMO methods and systems
EP3057179A4 (fr) * 2013-10-12 2016-10-19 Huawei Tech Co Ltd Système d'antenne et station de base
CN104577356B (zh) * 2013-10-12 2018-05-29 华为技术有限公司 天线***和基站
CN104577356A (zh) * 2013-10-12 2015-04-29 华为技术有限公司 天线***和基站
WO2018067045A1 (fr) * 2016-10-05 2018-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Système d'antenne pour transmission double

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Publication number Publication date
WO2001001582A3 (fr) 2001-08-23
AU1167901A (en) 2001-01-31

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