CN1251483A - Cross-polarization emitting antena and emitting method thereof - Google Patents
Cross-polarization emitting antena and emitting method thereof Download PDFInfo
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- CN1251483A CN1251483A CN99121507A CN99121507A CN1251483A CN 1251483 A CN1251483 A CN 1251483A CN 99121507 A CN99121507 A CN 99121507A CN 99121507 A CN99121507 A CN 99121507A CN 1251483 A CN1251483 A CN 1251483A
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- 238000000034 method Methods 0.000 title claims description 11
- 238000005388 cross polarization Methods 0.000 title 1
- 230000005540 biological transmission Effects 0.000 claims abstract 2
- 230000005684 electric field Effects 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 239000000969 carrier Substances 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 15
- 230000005672 electromagnetic field Effects 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007634 remodeling Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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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
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
-
- 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
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
-
- 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
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radio Transmission System (AREA)
Abstract
To address the issue of adding additional RF carriers to a transmitted signal in support of subscriber growth, an antenna configuration is utilized with orthogonally polarized transmission antenna pairs. The orthogonally polarized antennas are preferably arranged in substantially a +45 DEG/-45 DEG relationship and substantially maintain co-phase centers. By utilizing pairs of orthogonally polarized antenna components, the number of antennas necessary to transmit carrier signals can be halved. Further, undesirable size and space limitations can be avoided without a substantial loss in output carrier signals and without substantial signal interference.
Description
A kind of launching technique that the present invention relates to a kind of orthogonal polarization transmitting antenna and utilize cross-polarized antennas.
A generally acknowledged problem is round how extra radio frequency (RF) carrier wave being added to this problem of going up that transmits for the growth of supporting the user in the cellular basestation engineering.In a code division multiple access (CDMA) system, a RF carrier signal can be used by a plurality of users, but can use the number of users of this signal to fix.Similarly, for time division multiple access (TDMA) system, the user of fixed qty can use single RF carrier wave, although number of users is less than the number of users that can use single carrier wave in the cdma system.At last, for frequency division multiplexing (FDM) system, only a user can use a carrier signal.Therefore, no matter using CDMA, TDMA still is the FDM system, and the user of quantity uses because carrier wave only can be fixed, so must increase extra carrier wave with the increase of number of users.
About for supporting that the user increases extra RF carrier wave to transmit, three kinds of standard techniques are arranged at present, all have intrinsic limitation and unfavorable aspect.First kind of technology is to increase to have the extra transmitting antenna of single carrier RF power amplifier to amplify each carrier wave respectively.This method is very popular in mobile communication standard group (GSM) and tdma system, and wherein each carrier wave is supported a plurality of voice channels (being 8 voice channels among the GSM, is 3 voice channels among the TDMA).But by being that each extra carrier wave increases an antenna, then the quantity of the transmitting antenna in high power capacity base station and total actual size of antenna can become quite huge, as detailed below.
The conventional structure of prior art Fig. 1 instruction book carrier wave cell-site antenna 2, it uses independently carrier wave linear amplifier (ICLA) 4 of a special use.More properly, ICLA4 receives the low power RF signal of an introducing and it is enlarged into a high power signals, usually above 1 watt.This RF signal is a single-carrier signal, and for example, the signal of 1.95GHz has the bandwidth of about 1MHz, so scope is 1.9495-1.9505GHz.Therefore, along with the increase of number of users, needing extra carrier signal and being necessary for each required extra carrier increases extra antenna and ICLA.
As shown in Figure 1, prior art antenna 2 can be an individual antenna, perhaps can be the antenna element (6) of an orthogonal array usually.The RF signal that antenna 2 receives from the amplification of ICLA4.Antenna 2 radiation have the electromagnetic wave of perpendicular polarization electric field then., and consistent from the electromagnetic field of antenna 2 radiation with the direction of the antenna array unit shown in the line 6 of Fig. 1 about the electric field component perpendicular polarization.Thereby the antenna 2 of Fig. 1 is considered to a vertical polarized antenna.
Shown in Figure 2 as prior art, the transmitting antenna that utilization has single carrier RF power amplifier amplifies each carrier wave respectively, for supporting that the user increases extra RF carrier wave to transmit, then require to increase more vertical polarized antennas, and increase an ICLA for each antenna.Shown in Figure 2 as prior art, the first vertical polarized antenna 2a comprises by a corresponding ICLA 4a of the carrier wave of time/code division multiplexing " a " feed-in.The second perpendicular polarization transmitting antenna 2b can be with being increased by the corresponding ICLA 4b of the signal carrier of second o'clock/code division multiplexing " b " feed-in then.In addition, optionally the carrier wave of Zeng Jiaing how much, must use " n " individual vertical polarized antenna (2n) altogether, and wherein n is an integer, each antenna has extra ICLA (4a-4n), and each antenna when single/code division multiplex signal carrier wave " a " arrives " n " feed-in.In other words, when " n " is individual altogether/the code division multiplex signal carrier wave, need " n " individual transmitting antenna.
Be used for the extra vertical polarized antenna of each extra carrier wave by increase, single low power RF carrier signal is each antenna of feed-in and single ICLA successively, and the quantity of transmitting antenna and total actual size become quite huge.This can cause the space problem of wireless base station; Can cause the subregion problem with the increase of antenna; And can increase the cost of renting power space (as renting the pylon space).
Another known technology that increases extra RF carrier wave for the support user is at directly using high power tuned cavity RF combiner in two or more single carrier amplifiers (ICLA) back.Though combiner has reduced the needs for a plurality of transmitting antennas and feeder line, incident is expensive, RF power loss (being typically greater than 3dB), and the most important thing is the heavy losses of the flexibility when using the frequency spectrum that distributes.
For supporting the user to increase the use that another known technology that increases the RF carrier wave comprises multicarrier linear amplifier (MCLA).Because its linearity, so MCLA can amplify a plurality of RF carrier waves of its input of feed-in.Because these carrier waves before the feed-in amplifier in the low-power mixing, so that the RF loss just becomes is inessential.But the very expensive and most newer base stations of MCLA are designed to have only enough booster outputs to support the carrier wave of initial number.This requires to increase amplifier how arranged side by side along with the increase of carrier wave afterwards, and the realization cost of capacity to do is very high.
The present invention be directed to supporting the user to increase, replace single vertical polarized antenna, extra RF carrier wave is added to this problem of going up that transmits by utilizing paired cross-polarized antennas.Because two cross-polarized antennas can be manufactured on the assembly that occupies the volume actual identical with single vertical polarized antenna, therefore the size of main aerial aggregate can reduce by half, because only need half number of antennas assembly of many individual antenna assemblies to support RF carrier wave to determined number.In addition, cross-polarized antennas can realize the isolation of proper level between the desired respective orthogonal of emission system feed side, and can be desirably configured to and have the homophase center.
About following description, accessory claim book and accompanying drawing, characteristic that the present invention may be better understood and advantage.Identical reference number is represented identical unit in the accompanying drawing, wherein:
Fig. 1 describes a single carrier antenna/amplifier architecture of perpendicular polarization;
Fig. 2 describes a plurality of single carrier antenna/amplifiers of perpendicular polarization; And
Fig. 3 illustrates the application's a desirable embodiment, and it has used an antenna/amplifier architecture with public aperture antenna of orthogonal polarization.
The present invention is directed to design and use dual polarization transmitting antenna, is the orthogonal polarization transmitting antenna ideally, so that increase the RF carrier wave.The facility of using paired orthogonal polarization transmitting antenna rather than single vertical polarized antenna to increase the RF carrier wave is that cross-polarized antennas is more half as large than supporting to taking up space of the required single vertical antenna assembly of the RF carrier wave of determined number.In U.S.'s PCS Personal Communications System (PCS) and can launch in other internationally allocated band of the signal that can be polarized arbitrarily, use these cross-polarized antennas to be particularly useful, and with being connected of wireless base station in further be particularly useful.
Fig. 3 illustrates a desirable embodiment of the present invention.Fig. 3 illustrates the first antenna structure 10a, and it can be an individual antenna or an array antenna unit.That feed antenna 10a is a pair of ICLA, 12a and 12b.The one ICLA 12a amplifies can be by the first input RF carrier signal " a " of time-division or code division multiplexing, and the 2nd ICLA 12b amplifies also can be by the second input RF carrier signal " b " of time-division or code division multiplexing.Thereby entire antenna structure 10a can be used to launch two RF carrier signals " a " and " b ".Therefore, this antenna structure has replaced the structure of two vertical polarized antennas in essence.
Fig. 3 is used to illustrate that advantage of the present invention is present in the individual antenna structure 10a that supports two carrier waves, or supports the n/2 antenna structure of n carrier wave.Thereby antenna structure 10b and ICLA12c, 12d and antenna structure 10 (n/2) and ICLA 12 (n-1), 12n are and antenna 10a and the corresponding identical structure of ICLA 12a, 12b.Antenna amount should not thought restriction of the present invention.In addition, the input that should be noted that ICLA 12c and 12d be separately the time/code division multiplexing carrier signal " c " and " d "; When the input of ICLA 12 (n-1) and 12n is/code division multiplexing carrier signal " n-1 " and " n ".
Amplifier network 20 is used for a wireless network ideally, and more desirably is used for a cellular network.The position thereon the quantity of antenna and the type of amplifier network, no matter be ground or adjacent with antenna, all can not think restriction of the present invention.In addition, the structure of all ICLA 12 is identical in essence with ICLA 4.In addition, about ICLA 12, they can be adjacent with antenna 10, perhaps separates with antenna 10.ICLA/ antenna structure shown in Figure 3 shows that the ICLA 12 in the amplifier network 20 only illustrates, and should not think restriction of the present invention.
As shown in Figure 3, antenna structure 10a comprises pair of orthogonal polarization transmitting antenna, rather than single vertical polarized antenna.In essence, the antenna element of antenna structure 10a can be an array antenna or individual antenna, and the first direction shown in the unit 16 is consistent in the radiation field, its electric field component and Fig. 3.Second antenna element of antenna structure 10a; Also can be an array antenna or individual antenna, radiation second electromagnetic field, its electric field component is consistent with the direction of unit 18, ideally with the first electric field component quadrature.
First and second antenna elements of single antenna construction 10a (producing and direction 16 and 18 consistent electric field components) do not show here by discrete line of departure feed-in.In addition, should be noted that unit 16 and 18 with Fig. 3 is that each of twin aerial unit of example all typically excites as vertical antenna array.If like this, then imported the line of departure before being launched into antenna array unit, at first pass through a power divider (not showing) in a kind of known mode.First o'clock/code division multiplexing carrier wave " a " is by ICLA 12a input and amplification, and by an antenna element or array emission, the electric field component of this antenna element or array ELECTROMAGNETIC FIELD is relevant with the antenna element 16 of Fig. 3; Second o'clock/code division multiplexing carrier signal " b " is amplified by ICLA 12b, and by an independent antenna element or array emission, the electric field component of this antenna element or array ELECTROMAGNETIC FIELD is relevant with the antenna element of Fig. 3 18, is orthogonal to the electric field component relevant with the antenna element 16 of Fig. 3.
In addition, be that the antenna element of example is assembled in the single component with homophase center ideally with the unit 16 and 18 of Fig. 3.Arrange with reference to a fact at this homophase center, and promptly the electric field component of the antenna of orthogonal arrangement comprises public center, as shown in the intersection point of 3 unit 16 and 18.In addition, cross-polarized antennas has realized the isolation as the desired proper level of emission system between corresponding quadrature feed terminal.Because the orthogonality of antenna element, so cross interference amount minimum make in a common antenna assembly (10a) that has cross-polarized antennas (16,18) design and assemble with the homophase center, (12a unites use 12b) or with it to allow to use ICLA.
Therefore, utilize antenna structure 10a of the present invention, produce a plurality of signals " a " and " b ", each all is included in the independent carrier wave; Amplified by corresponding ICLA 12a and 12b; And use independently user who is transmitted into predetermined quantity from the wireless base station of paired cross-polarized antennas parts 16,18.These cross-polarized antennas parts are arranged as basically ideally+45 °/-45 ° relation.Use a kind of technology among TDMA, CDMA or the FDM to launch each signal.Thereby independently carrier wave is from occupying the antenna structure emission of minimum space, half antenna easy to use thus.
So describe after the present invention, obviously the present invention can retrofit aspect a lot.For example, the orthogonality of electromagnetic field strictly is not limited to linear polarization and involves associated antenna.Can between opposite meaning such as the right hand or left hand circular or elliptical polarization, set up orthogonality.These can or use intermediate magnitude and phase place to cut apart network and realize that its output is connected to the linearly polarized antenna unit by for example any special radiating element design.Can not think such or other remodeling has been run counter to the spirit and scope of the present invention, and for those skilled in the art, obviously all such remodeling all are included in the scope of following claims.
Claims (29)
1. radio transmission method may further comprise the steps:
Produce a plurality of signals, each signal packet is contained in the independent carrier wave; And
Use one of the pair of orthogonal poliarizing antenna parts independently signal of each generation of components, which transmits.
2. the launching technique of claim 1 further may further comprise the steps:
Before emission, amplify the signal of each generation.
3. the launching technique of claim 2, wherein the signal of each generation by one separately independently carrier wave linear amplifier (ICLA) amplify.
4. the launching technique of claim 1, the paired cross-polarized antennas arrangement of parts of wherein launching the signal of each generation become basically+45 °/-45 ° relation.
5. the launching technique of claim 1, wherein each antenna element comprises an aerial array.
6. the launching technique of claim 1, wherein each signal packet is contained in the independent carrier wave and is transmitted into the user of predetermined quantity from the wireless base station.
7. the launching technique of claim 6 wherein uses time division multiple access (TDMA), frequency division multiplexing (FDM) or code division multiple access (CDMA) technology to launch each signal.
8. antenna comprises:
First antenna element excites the first linear electric fields vector, can be used for launching first signal that is included in the carrier wave; And
Second antenna element excites the second linear electric fields vector with the first linear field vector quadrature, can be used for launching the secondary signal that is included in second carrier wave.
9. the antenna of claim 8, wherein first and second antenna elements are installed in the single component.
10. the antenna of claim 8, wherein first and second antenna elements are arranged in basically+45 °/-45 ° relation.
11. the antenna of claim 8, wherein each first and second antenna element comprises aerial array.
12. the antenna of claim 8, wherein first and second antenna elements excite the field vector of quadrature and assembled to keep the homophase center basically.
13. the antenna of claim 9, wherein first and second antenna elements excite the field vector of quadrature and assembled to keep the homophase center basically.
14. an antenna structure that is used for the signal emission comprises:
A plurality of amplifiers, each amplifier can be used for amplifying the signal that is included in the independent carrier wave; And
Be connected to the common antenna assembly of these a plurality of amplifiers, comprise pair of orthogonal poliarizing antenna parts, can be used for launching individually the amplifying signal that is included in the independent carrier wave.
15. the antenna structure of claim 14, wherein these a plurality of amplifiers comprise independently carrier wave linear amplifier (ICLA).
16. the antenna structure of claim 14, wherein these each parts to the cross-polarized antennas parts excite a mutually orthogonal field vector.
17. the antenna structure of claim 14, wherein this common antenna is installed in the single component.
18. the antenna structure of claim 14, wherein this keeps the homophase center basically to the cross-polarized antennas parts.
19. the antenna structure of claim 17, wherein this keeps the homophase center basically to the cross-polarized antennas parts.
20. the antenna structure of claim 14, wherein these each parts to the cross-polarized antennas parts comprise an aerial array.
21. the antenna structure of claim 16, wherein this field vector that cross-polarized antennas parts are excited is arranged in basically+45 °/-45 ° relation.
22. an antenna structure that is used for the signal emission comprises:
Signal generation device is used to produce a plurality of signals, and each signal packet is contained in the independent carrier wave; And
Emitter utilizes one of the pair of orthogonal poliarizing antenna parts independently signal of each generation of components, which transmits.
23. the antenna structure of claim 22 further comprises:
Amplifying device is used for amplifying the signal of each generation before emission.
24. the antenna structure of claim 23, wherein this amplifying device comprises a plurality of independently carrier wave linear amplifiers (ICLA), and each amplifier is used to amplify the signal of an independent generation.
25. the antenna structure of claim 22, wherein this becomes basically+45 °/-45 ° relation the cross-polarized antennas arrangement of parts.
26. the antenna structure of claim 22, wherein each antenna element comprises an aerial array.
27. the antenna structure of claim 22, wherein this emitter is transmitted into the signal that produces the user of predetermined quantity from the wireless base station.
28. the antenna structure of claim 22, wherein this keeps the homophase center basically to the cross-polarized antennas parts.
29. the antenna structure of claim 25, wherein this keeps the homophase center basically to the cross-polarized antennas parts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17265598A | 1998-10-15 | 1998-10-15 | |
| US09/172,655 | 1998-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1251483A true CN1251483A (en) | 2000-04-26 |
Family
ID=22628624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99121507A Pending CN1251483A (en) | 1998-10-15 | 1999-10-13 | Cross-polarization emitting antena and emitting method thereof |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0994567A2 (en) |
| JP (1) | JP2000151544A (en) |
| KR (1) | KR20000029026A (en) |
| CN (1) | CN1251483A (en) |
| AU (1) | AU5348399A (en) |
| BR (1) | BR9904453A (en) |
| CA (1) | CA2280351A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882574A (en) * | 2011-07-15 | 2013-01-16 | 华为技术有限公司 | Antenna system and signal transmitting equipment |
| CN104143692A (en) * | 2013-05-10 | 2014-11-12 | 中国电信股份有限公司 | Multi-antenna array and base station |
| CN106663872A (en) * | 2014-09-22 | 2017-05-10 | 华为技术有限公司 | Antenna system |
| WO2018014304A1 (en) * | 2016-07-21 | 2018-01-25 | 武汉芯泰科技有限公司 | Polarised frequency division multiplexing method, apparatus and system |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6583763B2 (en) | 1999-04-26 | 2003-06-24 | Andrew Corporation | Antenna structure and installation |
| US6621469B2 (en) | 1999-04-26 | 2003-09-16 | Andrew Corporation | Transmit/receive distributed antenna systems |
| US6983174B2 (en) | 2002-09-18 | 2006-01-03 | Andrew Corporation | Distributed active transmit and/or receive antenna |
| US6906681B2 (en) | 2002-09-27 | 2005-06-14 | Andrew Corporation | Multicarrier distributed active antenna |
| US6844863B2 (en) | 2002-09-27 | 2005-01-18 | Andrew Corporation | Active antenna with interleaved arrays of antenna elements |
| US7280848B2 (en) | 2002-09-30 | 2007-10-09 | Andrew Corporation | Active array antenna and system for beamforming |
| US6972622B2 (en) | 2003-05-12 | 2005-12-06 | Andrew Corporation | Optimization of error loops in distributed power amplifiers |
| US7962174B2 (en) | 2006-07-12 | 2011-06-14 | Andrew Llc | Transceiver architecture and method for wireless base-stations |
-
1999
- 1999-08-18 CA CA002280351A patent/CA2280351A1/en not_active Abandoned
- 1999-10-05 EP EP99307850A patent/EP0994567A2/en not_active Withdrawn
- 1999-10-06 AU AU53483/99A patent/AU5348399A/en not_active Abandoned
- 1999-10-07 BR BR9904453-6A patent/BR9904453A/en not_active Application Discontinuation
- 1999-10-13 KR KR1019990044223A patent/KR20000029026A/en not_active Withdrawn
- 1999-10-13 CN CN99121507A patent/CN1251483A/en active Pending
- 1999-10-15 JP JP11293128A patent/JP2000151544A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882574A (en) * | 2011-07-15 | 2013-01-16 | 华为技术有限公司 | Antenna system and signal transmitting equipment |
| CN102882574B (en) * | 2011-07-15 | 2014-12-31 | 华为技术有限公司 | Antenna system and signal transmitting equipment |
| CN104143692A (en) * | 2013-05-10 | 2014-11-12 | 中国电信股份有限公司 | Multi-antenna array and base station |
| CN106663872A (en) * | 2014-09-22 | 2017-05-10 | 华为技术有限公司 | Antenna system |
| CN106663872B (en) * | 2014-09-22 | 2019-10-18 | 华为技术有限公司 | an antenna system |
| US10680790B2 (en) | 2014-09-22 | 2020-06-09 | Huawei Technologies Co., Ltd. | Antenna system |
| WO2018014304A1 (en) * | 2016-07-21 | 2018-01-25 | 武汉芯泰科技有限公司 | Polarised frequency division multiplexing method, apparatus and system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000029026A (en) | 2000-05-25 |
| JP2000151544A (en) | 2000-05-30 |
| BR9904453A (en) | 2000-11-14 |
| CA2280351A1 (en) | 2000-04-15 |
| AU5348399A (en) | 2000-04-20 |
| EP0994567A2 (en) | 2000-04-19 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |