WO2003012917A1 - Station de base de radiocommunication a diagramme de rayonnement variable - Google Patents
Station de base de radiocommunication a diagramme de rayonnement variable Download PDFInfo
- Publication number
- WO2003012917A1 WO2003012917A1 PCT/FR2002/002741 FR0202741W WO03012917A1 WO 2003012917 A1 WO2003012917 A1 WO 2003012917A1 FR 0202741 W FR0202741 W FR 0202741W WO 03012917 A1 WO03012917 A1 WO 03012917A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- base station
- control
- lobe
- station according
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
-
- 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
- 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
Definitions
- the present invention relates to the transmission of signals between two transceivers distant from each other. It relates more particularly to the transmission and reception of signals by a base station linked by radio to radiocommunication terminals.
- radio communication between a base station and a terminal which may be a mobile terminal
- a base station and a terminal is subject to disturbing phenomena of radio transmission between the antenna of the base station and the antenna of the mobile terminal, in particular to channel fading, due to destructive interference between signals which follow different propagation paths between the base station and the terminal.
- the diversity of one of the characters linked to this transmission is one of the methods developed to overcome fading.
- diversity of reception consisting of receiving the signal simultaneously on two antennas, diversity of emission, consisting of equipping the base station with several antennas transmitting the same signals, diversity of polarization, diversity of frequency (see for example the work “GSM networks” by X. Lagrange et al., Hermès Science Publications editions, 2000, page 161), etc.
- antennas comprising devices for adjusting the radiation pattern. Such adjustments relate for example to the direction of emission of the antenna or the width of the main emission lobe.
- Most antennas with electronic beam guidance are composed of several antenna elements supplied individually by signals obtained by phase shift of an initial signal.
- the value of the phase shift is determined according to the antenna element to which the signal is addressed phase shifted, and the direction of transmission by the antenna results from the combination of the signals phase shifted with respect to each other transmitted by all the antenna elements.
- Such antennas are sometimes used to focus a radio beam intended for a particular terminal.
- the components of an uplink radio signal emitted by the terminal, picked up by the various antenna elements are analyzed in terms of phase shifts in order to estimate a direction of the space from which this uplink signal comes. .
- Corresponding phase shifts are then applied to the downlink signal intended for this terminal so that its transmission is oriented in this direction.
- Such electronic beam guidance allows significant reductions in the level of interference. It is mainly used in satellite antennas. However, it has been proposed to use it in terrestrial systems despite its complex and costly implementation.
- An object of the present invention is to propose a new mode of radio diversity at the level of a base station.
- the subject of the present invention is a base station comprising at least one transmitting antenna composed of several radiating elements, means for producing at least one signal component, transmission means for addressing to the radiating elements of the antenna. for transmitting radio signals generated from signal components originating from the production means, the transmission means including phase adaptation means for generating phase shifts in the radio signals addressed to the radiating elements and control means an antenna emission diagram by adjusting said phase shifts, characterized in that the control means comprise means for varying at least some of said phase shifts in time so as to cause a systematic fluctuation in the direction of at least an antenna emission lobe around a reference direction.
- the present invention therefore provides a diversity mechanism based on the transmission of radio signal sequences according to different propagation paths between the base station and the terminal, and which is applicable with a single transmitting antenna.
- the fluctuation of the direction of an emission lobe causes variations between the propagation paths followed by successive sequences of the signal, thus preventing all the sequences from being disturbed identically.
- the phase adaptation means and the emission diagram control means are entirely electronic in nature and allow digital adjustment of the phase shift of the signal emitted by each radiating element.
- Such a phase shift treatment in fact provides possibilities for adjusting the phase shifts greater than those of systems incorporating electromechanical parts, as well as particularly rapid variations of said phase shifts.
- Fluctuations in the direction of an antenna emission lobe caused by variations in phase shifts are determined according to a previously fixed sequence. These fluctuations can, for example, be adapted as a function of the topography of the geographic area covered by the antenna, favoring in particular emission sectors according to which the transmission of the signals is particularly efficient.
- control means are arranged to vary the phase shifts so as to cause the direction of an antenna emission lobe to fluctuate by discrete jumps, for example between two directions chosen by both and on the other from a reference direction.
- _fluçtuations_ may result from the execution of a program. dedicated to this purpose, controlling these fluctuations in the form of iterative sequences, or using a random process.
- the program may also include certain parameters adaptable by the operator of the base station.
- the systematic fluctuation of the direction of a transmission lobe is independent of the destination terminals of the signal components.
- the fluctuation of the direction of an emission lobe is applied around a reference direction attached to this lobe.
- the base station may further comprise means for orienting this reference direction to at least one terminal receiving at least one component of the signal.
- the reference direction of the transmission lobe can vary in the same way and followed the ue ⁇ iaceme ⁇ i at the mobile terminal .
- the fluctuation of the direction of the emission lobe is then superimposed on the variation of the reference direction of this same lobe.
- the fluctuation imposed on the direction of the emission lobe is much faster than the variation of the reference direction of this lobe.
- the same principle of diversity applies to the reception by the base station of the radio signals transmitted by the remote mobile terminals.
- at least one direction of a reception lobe is modified so as to receive a complete radio signal in the form of signal sequences which have followed different propagation paths between the terminal and the base station.
- the transmitting antenna of a base station is also used for the reception of signals by this station.
- some of the signal processing devices associated with the antenna are common to transmission and reception. It is therefore understood, in the context of the present invention, that the mechanisms described concerning the emission of a signal with a diversity obtained by fluctuation of at least one direction of emission of the antenna can be applied, by simple transposition, on reception of signals with a diversity corresponding to the fluctuation of at least one direction of reception of the antenna.
- certain components used to cause a direction of emission to fluctuate in particular the phase adaptation means and the means for controlling the emission diagram can also be used during reception. In a preferred operating mode, the fluctuations in the reception direction or directions a priori reproduce the fluctuations in the transmission direction or directions.
- the invention therefore also relates to a base station comprising at least one reception antenna composed of several antenna elements, phase adaptation means for applying respective phase shifts to signal components originating from the antenna elements, means for controlling an ⁇ iagram for receiving the antenna by adjusting said phase shifts, and means for processing at least one signal constructed after combining the phase components of the signal, characterized in that the control means include means for making varying over time said phase shifts so as to cause a systematic fluctuation in the direction of at least one antenna receiving lobe around a reference direction.
- FIG. 2 illustrates a first embodiment of the device used to control the fluctuations of an emission direction of the antenna
- FIG. 3 illustrates a first embodiment of the device used to control the fluctuations of a direction of reception of the antenna
- FIG. 4 illustrates a second embodiment of the device used to control the fluctuations of an emission direction of the antenna
- FIG. 5 illustrates a second embodiment of the device used to control the fluctuations of a direction of reception of the antenna.
- the base station 100 transmits by means of the antenna 1 a radio signal intended for terminals 200 located within range of this antenna.
- the antenna 1 consists of radiating elements 2 juxtaposed. All these radiating elements 2 are fixed relative to the support of the antenna 101, and oriented facing the geographic sector intended to be served by the antenna.
- the antenna emission pattern generally consists of a main lobe, corresponding to an angular sector within which the radiation power is greater than a fixed value, and limited according to the distance from the antenna by the reduction in power linked to the propagation of the radiation.
- the axis of this main lobe corresponds to the direction D of emission of the antenna 1.
- the direction D of emission can be identified by a system of spherical coordinates having as pole the center O of the antenna 1. These coordinates include for example the elevation angle of the direction D of emission relative to a horizontal plane containing the point O, and the azimuth angle between the projection of the direction D on the horizontal plane and an axis R of reference contained in this plane, for example oriented perpendicular to the group of radiating elements and passing through point O.
- a radio transmission-reception site comprises a cell-type base station which radiates different radio signals in separate transmission and reception sectors, each sector being served by a directional antenna of the preceding type.
- the fluctuations in the direction D of emission of the antenna 1 are then identified by the evolution of the elevation and azimuth angles.
- a fluctuation in the direction D lying in a vertical plane corresponds to a variation in the elevation angle.
- a fluctuation in a horizontal plane corresponds to a variation of the azimuth angle.
- D of emission carried out collectively for all terminals regardless of their location, relates essentially to the angle of elevation. However, it is also possible to vary the azimuth angle or a combination of these two angles.
- signals are transmitted after application of channel coding and interleaving.
- Channel coding adds redundancy to the symbols of the digital signal, with a structure allowing the receiver to detect and correct transmission errors.
- the codes usually used have optimal performance when errors occurring during transmission are uncorrelated.
- Interleaving consists of a permutation of symbols intended to tend towards this condition of decorrelation while transmission errors on a radio interface tend to occur in packets because of the fading phenomenon.
- the permutation of the interleaving relates to a certain duration (from one to a few tens of milliseconds) chosen to achieve a compromise between the performance of the decoder and the processing delay implied by the interleaver.
- This interleaving time can vary from one channel to another, as for example in the case of a UMTS system (“Universal Mobile Telecommunication System”) where it is from 10 to 80 ms.
- UMTS Universal Mobile Telecommunication System
- these variations are carried out at a frequency of the order of, and preferably greater than the reverse the interlacing time.
- the variation frequency is advantageously equal to or greater than 100 Hz.
- FIG. 2 schematically shows a first embodiment of the means employed by a base station to generate diversity by fluctuation of the direction of transmission of the antenna 1.
- Each signal component Si, S 2 , ..., SM, intended for a particular terminal 200 or belonging to a common channel, is produced by a processing channel comprising a channel encoder 3, an interleaver 4, a modulator 5, then a power adjustment module 6.
- the signal components Si, S 2 , ..., SM delivered by the different processing channels are then combined by a multiplexing unit 7 in a baseband signal S delivered to the radio transmission stage.
- the constitution of the modulators 5 and of the multiplexing unit 7 depends on the multiple access mode used in the radiocommunication system to which the invention is applied.
- the modulators 5 carry out the modulation in baseband or on an intermediate frequency, while the multiplexer 7 distributes the signal components Si, S 2 , ..., SM in respective time slots of the signal frames, corresponding to the channel channels.
- TDMA time-division
- CDMA codes
- the modulators 5 can achieve spectrum spreading by applying the spreading codes assigned to the different channels, while the multiplexer 7 simply performs a summation of the signal components Si, S 2 SM.
- a separator 8 reproduces the signal S on each transmission channel corresponding to a radiating element 2 of the antenna 1.
- phase shift unit 9 then applies to the signal of each transmission channel a respective phase shift D1, D 2 DN.
- Each phase shift is determined by the position in the antenna 1 of the radiating element 2, and depends on the emission direction of the antenna 1 controlled by the emission diagram controller 10.
- FR-A-2 792 116 describes an example of a phase adaptation device usable as a phase shift unit 9.
- the radio stage then performs the conventional filtering, analog conversion 11, transposition to the carrier frequency 12 and power amplification 13 operations from the signals delivered by the phase shift unit 9.
- Each radiating element 2 receives then the amplifier 13 which is associated with it, via a duplexer 14, the phase shifted radio signal E 1 , E 2 , ..., E corresponding to its transmission channel.
- the phase shift unit 9 can also weight the amplitude of the signal corresponding to each transmission channel. In a manner known to the specialist in radio transmissions, such a weighting makes it possible to modify a width of the emission diagram by adjusting the amplitudes of the signals emitted by each radiating element 2. Thus, during the emission of the signal by the antenna 1, 1 he angular opening of the emission diagram can be modified simultaneously with the fluctuation of the emission direction D in order to increase the efficiency of the creation of diversity according to the invention.
- FIG 3 shows, analogously to Figure 2, an example of means usable for the creation of diversity by fluctuation of the direction of reception of the antenna during the reception of radio signals by a base station.
- the reception antenna 1, composed of the antenna elements 2, receives radio signals transmitted by mobile terminals 200.
- Each radio signal component E'-i, E ' 2 , ..., E'N received by a antenna element 2 is addressed to the reception channel associated with this antenna element.
- This channel comprises, downstream of the duplexer 14 and of filter elements not shown, a low noise amplifier 13a, a frequency transposer 12a and an analog-digital converter 11a which delivers the signal component to the phase shift unit 9a .
- This phase shift unit 9a operates a phase shift compensation between the signal components of each reception channel so as to synchronize them at the input of the combination unit 8a.
- This phase shift compensation is governed by the controller 10 as a function of the direction or directions of reception of the antenna 1.
- the combination unit 8a then groups together in a single signal S ′ the signal components originating from all the reception channels and supplies this signal S ′ to the demultiplexer 7a.
- the latter separates in the signal S 'the contributions S' r S ' 2 , ... S corresponding to different transmitter terminals 200, and addresses them respectively to separate processing channels.
- Each of these channels then comprises a demodulator 5a and all the usual components necessary to extract the useful information from the received signal.
- the fluctuation in time of the direction (s) of transmission and / or reception of the antenna 1 is carried out by discrete jumps, preferably between two predefined directions. This minimizes disturbance to the process of estimating the propagation channel when the receiver performs coherent demodulation.
- the ability to track the movement of a mobile terminal 200 can make a continuous fluctuation mode of the sinusoidal, triangular or other type also desirable for the fluctuation of at least minus a direction of transmission and / or reception of the antenna 1.
- FIG. 4 schematically shows a second exemplary embodiment of the means of a base station for generating diversity by fluctuation of the direction of transmission.
- the common references with FIG. 2 correspond to identical means.
- each antenna element ⁇ ⁇ receives, by means of transmission to which it is connected, a radio signal Ei, E 2, ..., IN to issue each resulting from a plurality of signals S 1, ..., S ⁇ in baseband.
- Each of the signals S 1 S ⁇ is itself a combination of several signal components.
- S ⁇ , ..., S 1 M are the components of the signal S 1 , ..., similarly
- S ⁇ ⁇ S K M are the components of the signal S ⁇ , produced by as many independent processing channels.
- Each processing channel leads to a multiplexer 7 which produces the signal S 1 , ..., S ⁇ by combination of the components.
- Each processing channel comprises the same components as those presented with reference to FIG. 2.
- the signal components S 1 ⁇ S 1 M , ..., S ⁇ ⁇ , .... S K M associated with each of the signals S 1 S ⁇ can be, for example, multimedia signals intended for a given terminal receiving one of the signals S 1 , ..., S ⁇ .
- phase shift units 9 can also correspond to signals assigned to a given sector served by the antenna.
- the signal S 1 , ..., S ⁇ is reproduced by a separator 8 to form signal contributions associated with each transmission channel.
- a phase shift unit 9 then applies a phase shift to each signal contribution.
- the phase shift D 1 ⁇ is applied to the signal contribution from the signal Si associated with the radio signal Ei of the first transmission channel and, likewise, the phase shift D N is applied to the signal contribution resulting from the signal S ⁇ associated with the radio signal E of the N th transmission channel.
- the radio signal from an antenna 2 determined element, for example Ei is the superposition of several elementary radio signals corresponding to contributions from each of the signals S 1, ..., S independent ⁇ .
- the respective phase shifts D 1 ⁇ , ..., D ⁇ ⁇ applied by the phase shift units 9 to these different contributions may be different from each other, corresponding to fluctuations in different emission directions controlled by the general controller 10.
- each phase shifted signal contribution to the corresponding transmission channel is carried out by a distributor 7 '.
- the distributor 7 ' has an input for each phase shifted signal contribution, and an output connected to each transmission channel. It thus addresses to each transmission channel the contributions of phase-shifted signals in accordance with the position in the antenna 1 of the antenna element 2 supplied by this transmission channel.
- the phase shifts are introduced upstream of the radio stage, which allows easier installation of the phase shift units 9, in particular an installation of these units at the foot of the antenna 1 in the case where the radio stage is largely carried out at the antenna level.
- FIG. 5 corresponds to FIG. 4 for a reception operation which uses the diversity resulting from the fluctuation of the direction of reception of the antenna.
- Each antenna element 2 delivers a radio signal E'i, E ' 2 E'N to a radio reception channel to which it is connected.
- a duplexer 14, a low noise amplifier 13a, a frequency transposer 12a and an analog-digital converter 11a arranged in this radio reception channel produce a signal component delivered to a distributor 7'a.
- the distributor 7'a respectively transmits to phase shift units 9a different from the elementary components of each signal component corresponding to distinct channel references.
- the controller 10 determines the phase shift applied to each of them and commands the corresponding phase shift unit 9a to compensate for this phase shift.
- the elementary signal components at the output of a given phase shift unit are then synchronized. They are then combined with each other by a combination unit 8a to obtain a signal different S ' 1 , ..., S' p per phase shift unit 9a. Each of these signals S ' 1 , ..., S' ⁇ is then processed independently in the manner already described with reference to FIG. 3. It is in particular separated by a demultiplexer 7a into elementary signals S' ⁇ 1 , .. ., S' ⁇ P respectively corresponding to ⁇ istinct processing channels.
- FIGS. 4 and 5 An embodiment according to FIGS. 4 and 5 is well suited to the case of antennas with beam guidance towards mobile terminals.
- a multiplexing unit 7 can be allocated to each terminal being tracked to multiplex the different channels intended for this terminal (this multiplexing unit is not necessary in the case where only one channel is intended for the terminal).
- the reference direction is then defined for each terminal by means known to those skilled in the art. The invention makes it possible to superimpose on the relatively slow variation of this reference direction, due to the movements of the terminal, a systematic, faster fluctuation, of the transmission direction around this reference direction, which makes it possible to combat the effects negative of channel fading.
- a third implementation ⁇ consists in printing a fluctuation in the elevation angle to the entire antenna emission diagram. This fluctuation is introduced analogically or digitally when controlling the elevation angle of the antennas. This third implementation is therefore particularly simple, since it does not require any modification of the structure or of the operation of the currently existing antennas.
- the base station generates a single radio signal for the cell, to which the phase shifts are applied by means of analog phase shifters located between the duplexer and the antenna elements and controlled to jointly fluctuate the directions transmission and reception.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/477,408 US7327702B2 (en) | 2001-07-30 | 2002-07-30 | Variable radiation pattern radiocommunication base station |
EP02774864A EP1413005A1 (fr) | 2001-07-30 | 2002-07-30 | Station de base de radiocommunication a diagramme de rayonnement variable |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/10187 | 2001-07-30 | ||
FR0110187A FR2828031B1 (fr) | 2001-07-30 | 2001-07-30 | Station de base de radiocommunication a diagramme de rayonnement variable |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003012917A1 true WO2003012917A1 (fr) | 2003-02-13 |
Family
ID=8866077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/002741 WO2003012917A1 (fr) | 2001-07-30 | 2002-07-30 | Station de base de radiocommunication a diagramme de rayonnement variable |
Country Status (4)
Country | Link |
---|---|
US (1) | US7327702B2 (fr) |
EP (1) | EP1413005A1 (fr) |
FR (1) | FR2828031B1 (fr) |
WO (1) | WO2003012917A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9473187B2 (en) * | 2012-12-20 | 2016-10-18 | Cellco Partnership | Wireless radio extension using up- and down-conversion |
US10447337B2 (en) * | 2014-07-31 | 2019-10-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Duplexer system and associated digital correction for improved isolation |
US9972893B2 (en) | 2015-12-29 | 2018-05-15 | Commscope Technologies Llc | Duplexed phased array antennas |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0877444A1 (fr) * | 1997-05-05 | 1998-11-11 | Nortel Networks Corporation | Architecture pour la formation de faisceaux dans la liaison descendante pour une configuration avec faisceaux en chevauchement |
US6070090A (en) * | 1997-11-13 | 2000-05-30 | Metawave Communications Corporation | Input specific independent sector mapping |
US6091788A (en) * | 1995-05-24 | 2000-07-18 | Nokia Telecommunications Oy | Base station equipment and a method for steering an antenna beam |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5303240A (en) * | 1991-07-08 | 1994-04-12 | Motorola, Inc. | Telecommunications system using directional antennas |
AU699517B2 (en) | 1994-11-04 | 1998-12-03 | Andrew Llc | An antenna control system |
US5848103A (en) * | 1995-10-04 | 1998-12-08 | Lucent Technologies Inc. | Method and apparatus for providing time diversity |
JP3432697B2 (ja) * | 1997-04-02 | 2003-08-04 | 松下電器産業株式会社 | 適応受信ダイバーシチ装置及び適応送信ダイバーシチ装置 |
US5977910A (en) * | 1997-08-07 | 1999-11-02 | Space Systems/Loral, Inc. | Multibeam phased array antenna system |
FR2792116B1 (fr) | 1999-04-07 | 2003-06-27 | Agence Spatiale Europeenne | Formation numerique de faisceaux |
-
2001
- 2001-07-30 FR FR0110187A patent/FR2828031B1/fr not_active Expired - Lifetime
-
2002
- 2002-07-30 US US10/477,408 patent/US7327702B2/en active Active
- 2002-07-30 EP EP02774864A patent/EP1413005A1/fr not_active Withdrawn
- 2002-07-30 WO PCT/FR2002/002741 patent/WO2003012917A1/fr not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6091788A (en) * | 1995-05-24 | 2000-07-18 | Nokia Telecommunications Oy | Base station equipment and a method for steering an antenna beam |
EP0877444A1 (fr) * | 1997-05-05 | 1998-11-11 | Nortel Networks Corporation | Architecture pour la formation de faisceaux dans la liaison descendante pour une configuration avec faisceaux en chevauchement |
US6070090A (en) * | 1997-11-13 | 2000-05-30 | Metawave Communications Corporation | Input specific independent sector mapping |
Also Published As
Publication number | Publication date |
---|---|
FR2828031B1 (fr) | 2003-10-17 |
US7327702B2 (en) | 2008-02-05 |
EP1413005A1 (fr) | 2004-04-28 |
FR2828031A1 (fr) | 2003-01-31 |
US20040141529A1 (en) | 2004-07-22 |
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