WO1999021292A2 - Method and arrangement in a telecommunication system - Google Patents

Method and arrangement in a telecommunication system Download PDF

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Publication number
WO1999021292A2
WO1999021292A2 PCT/SE1998/001892 SE9801892W WO9921292A2 WO 1999021292 A2 WO1999021292 A2 WO 1999021292A2 SE 9801892 W SE9801892 W SE 9801892W WO 9921292 A2 WO9921292 A2 WO 9921292A2
Authority
WO
WIPO (PCT)
Prior art keywords
lobes
lobe
fixed
lfl
interpolation
Prior art date
Application number
PCT/SE1998/001892
Other languages
French (fr)
Other versions
WO1999021292A3 (en
Inventor
Henrik Andersson
Jens Malmgren
Original Assignee
Radio Design Innovation Tj Ab
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
Priority claimed from SE9703823A external-priority patent/SE9703823D0/en
Application filed by Radio Design Innovation Tj Ab filed Critical Radio Design Innovation Tj Ab
Priority to AU96592/98A priority Critical patent/AU9659298A/en
Priority to EA200000435A priority patent/EA200000435A1/en
Publication of WO1999021292A2 publication Critical patent/WO1999021292A2/en
Publication of WO1999021292A3 publication Critical patent/WO1999021292A3/en

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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
    • 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
    • H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • 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 to a method for lobe shifting in a telecommunication system and an arrangement in a lobe forming network.
  • Figure 1 discloses a schematic diagram of a flexible lobe shaping system.
  • the antenna array has preferably eight antenna elements.
  • Each frequency channel has its own set of weights (e.g. Wj(l) - g(l) in Figure 1). The number of these weights is determined by the number of antenna elements used.
  • the lobe shaping system of Figure 1 is described in detail in the pending applications 9601613-4 (Method and Arrangement of Converting a Cellular Tele- communication System, Applicant: Radio Design AB), 9601615-9 (Rotating Lobe Access Method, Applicant: Radio Design AB) and 9601614-2 (Antenna System, Applicant: Radio Design AB) , which applications are incorporated herein by reference.
  • the flexible lobe shaping system according to Figure 1 has very high per- formance.
  • the lobes of this system can be directed towards a mobile terminal in an arbitrary direction, i.e. the direction ⁇ of the lobe can be continously varied from 0 to 180°. It should be realized that interference cancellation by radiation pattern nulling also is possible.
  • FIG. 2 discloses a schematic block diagram of the fixed lobe shaping network.
  • LFl-n denotes the n different fixed lobes.
  • the parts in broken lines are multiple, i.e. the number of these is determined by the number of transceivers.
  • the object of the present invention is to overcome the drawbacks of the above discussed systems, i.e. to create a system which is cheap, uses simple algorithms, has high lobe direction performance and supports interference cancellation.
  • the number of lobes can be reduced compared to fixed lobe shaping network.
  • Figure 1 is a schematic diagram of the flexible lobe shaping system
  • Figure 2 is a schematic block diagram of a fixed lobe shaping unit
  • Figure 3 discloses lobe directions of the fixed lobe shaping unit in Figure 2
  • Figure 4 is a block diagram of the seamless lobe forming network in accordance with the present invention
  • Figure 5 discloses interpolation between fixed lobes according to the present invention
  • Figure 6 discloses cancellation of a side lobe in accordance with the present invention
  • Figure 7 is a realization on component level of the block diagram of Figure 4;
  • Figure 8 is a I-Q Vector Modulator.
  • the invention is based on the fixed lobe shaping system, the system of which uses coarse weighting of the lobe through the fixed lobe forming network.
  • the invention lies in the splitter and the fine tuning device as can be seen in Figure 4.
  • the antenna array has preferably eight antenna elements, the function of which is explained in the above mentioned pending application. Antenna System.
  • the parts in broken lines are multiple, i.e. the number of these is determined by the number of transceivers.
  • the coarse part of Figure 4 consists of lobe shaping units, which generate lobes in fixed directions.
  • These lobe shaping units have 8 fixed complex weight coefficients (magnitude- and phase weights), which coefficients are multiplied with a signal on its way to (or on its way from) each one of the antenna element.
  • the complex weight coefficients are chosen so that the multiplied signals from/to the antenna elements interact with high gain in a fixed direction. i.e. fixed main lobe (LFl, Figure 6) and interfere with low gain in all other directions (SL1, side lobes, Figure 6).
  • the core of the invention lies in the fine tuning device using an arbitrary number (LFl-LFn) of fixed lobes simultaneously. This results in a interpolation between the fixed lobes (LFl-LFn).
  • the invention enables tracking of mobile terminals by the use of fine tuned fixed lobes.
  • the invention is used both in up- and downlink.
  • a combiner is used and in the downlink a splitter is used.
  • the implementation can of course differ but the inventive principle is the same.
  • the splitter in Figure 4 divides the effect from TRX between the inputs of the fine tuning device. Normally the effect is equally divided between the inputs of the fine tuning device. It should be realized that when TRX is receiving a combiner is used to combine the signal effect from the outputs of the fine tuning device.
  • the fine tuning device in Figure 4 comprises modulators.
  • modulators are used to modulate the phase and the amplitude of the signal.
  • a preferable modulator is for example the I-Q vector modulator as can be seen in Figure 8.
  • the I-Q vector modulator is a unique combination of active and passive devices that is, in theory, ideally suited for simultaneous control of amplitude and phase.
  • the modulators (1-n) are used to achieve lobe interpolation and interference cancellation of side lobes.
  • PIN diode attenuators can be used for lobe interpolation, However, PIN diode attenuators cannot achieve interference cancellation.
  • LF interpolation a lobe between the fixed lobes LFl and LF2 in Figure 5.
  • the signal from the splitter in Figure 4 is divided in n equally large signals, which are delivered in phase to the modulators 1-n in the fine tuning device.
  • the attenuation of modulator 1/PIN diode attenuator 1 and modulator 2/PIN diode attenuator 2 is set to a minimum value, after which lobes LFl and LF2 are added to create the interpolation lobe (LF interpolation) as can be seen in Figure 5.
  • the attenuation of the other modulators 3-n/PIN diode attenuator 3-n is set to a maximum value.
  • signals in the modulators/PIN diode attenuators 1-n are amplitude modulated and the fixed lobes (LFl - LFn) associated with the amplitude modulated signals are added together to create the lobe interpolation (LF interpolation).
  • This transition between fixed lobes and interpolated lobes is referred to as seamless lobe shifting.
  • the signal from the splitter can be divided equally or unequally to the modulators 1-n in the fine tuning device. This implies that you can combine an arbitrary number of lobes (LFl-LFn), e.g. lobes LFl, LF3. LF4, LF6 and LFn, to create an optional antenna pattern, e.g. a wide lobe.
  • LFl-LFn a number of lobes
  • the lobe forming network in Figure 4 can also be used for interference cancellation as can be seen in Figure 6 provided that a phase-modulator is used, for example an I-Q vector modulator ( Figure 8).
  • a phase-modulator for example an I-Q vector modulator ( Figure 8).
  • Figure 6 A discloses a situation where a mobile terminal MT1 uses the channel of LFl for communication with the base station. Side lobe SLl originating from main lobe LF 1 disturbs the mobile terminal MT2 which is communicating on the same channel. In this case most of the signal effect is distributed in the fixed lobe LFl .
  • the signal of for example modulator 4 in the fine tuning device of Figure 4 is phase- and amplitude modulated so that the lobe LF4 associated with said modulated signal has the same amplitude as side lobe SLl but is in counterphase (180° phase shifted) in relation to side lobe SLl as may be seen in Figure 6B.
  • lobe LF4 radiates in the same direction as side lobe SLl but is in counterphase in relation to lobe SLl implying an interference cancellation. This cancellation is only figuratively disclosed in Figure 6B.
  • Figure 7 is a circuit diagram of the invention in accordance with Figure 4.
  • Figure 7 discloses a system with two TRX (10, 20, transmitter/receiver), four fixed lobes and four dipole columns per antenna. It should of course be realized that an arbitrary number of TRX, lobes and dipole columns could be used.
  • the splitter 11 is preferably an ordinary Wilkinson splitter/combiner, which is described in Microwave Transistor Amplifiers, Guillermo Gonzales ISDN 0-13-254 335-4. It should be emphasized that the splitter 11 can be used for both splitting and combining due to transmission or reception of radio signals. In Figure 7 the signal is divided by four in the splitter 11.
  • the modulators 12 are PIN diode attenuators or vector modulators as described above.
  • the modulators 12 are connected to combiners 16 combining signals from the two TRX 10, 20.
  • the combiners 16 are connected to dividers 13 which divide the signals by a factor 4.
  • the dividers 13 are connected to a delay line and fixed attenuators 14 or vector modulators 14, which in turn are connected to combiners 15.
  • Combiners 15 are connected to amplifiers 17.
  • the signals from combiners 15 are amplified in amplifiers 17 and are then fed to the antenna element 19 via the duplex filter 18 for transmission. In principle, the same system (slightly modified) is used for the reception of radio signals.

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

Abstract

The invention relates to a method for lobe shifting in a telecommunication system and an arrangement in a lobe forming network, wherein a fine tuning device is arranged to achieve interpolation between fixed lobes (LF1-LFn) to create an interpolated lobe with an arbitrary direction between the fixed lobes. The fine tuning device according to the invention supports interference cancellation.

Description

APPLICANT: RADIO DESIGN AB
TITLE OF INVENTION: METHOD AND ARRANGEMENT IN A TELECOMMUNICATION SYSTEM
Field of invention
The present invention relates to a method for lobe shifting in a telecommunication system and an arrangement in a lobe forming network.
Prior art
Figure 1 discloses a schematic diagram of a flexible lobe shaping system. The antenna array has preferably eight antenna elements.
Each frequency channel has its own set of weights (e.g. Wj(l) - g(l) in Figure 1). The number of these weights is determined by the number of antenna elements used.
The number of weight sets is determined by the number of simultaneously channels. Each frequency channel has one set of weights and if SDMA (Spatial Division Multiple Access) is used there must be several weight settings for each frequency channel. No. of weight sets = No. of frequency channels x SDMA factor.
No. of complex weights = No. of frequency channels x SDMA factor x number of antenna elements.
The lobe shaping system of Figure 1 is described in detail in the pending applications 9601613-4 (Method and Arrangement of Converting a Cellular Tele- communication System, Applicant: Radio Design AB), 9601615-9 (Rotating Lobe Access Method, Applicant: Radio Design AB) and 9601614-2 (Antenna System, Applicant: Radio Design AB) , which applications are incorporated herein by reference.
The flexible lobe shaping system according to Figure 1 has very high per- formance. The lobes of this system can be directed towards a mobile terminal in an arbitrary direction, i.e. the direction θ of the lobe can be continously varied from 0 to 180°. It should be realized that interference cancellation by radiation pattern nulling also is possible.
However, the problem with this flexible lobe shaping system of Figure 1 is that it is very expensive, i.e. too much expensive equipment is used and algorithms required are too advanced.
This problem may be solved by a fixed lobe shaping network as can be seen in Figure 2. Figure 2 discloses a schematic block diagram of the fixed lobe shaping network. LFl-n denotes the n different fixed lobes. The parts in broken lines are multiple, i.e. the number of these is determined by the number of transceivers.
Details of this system is disclosed in the above discussed pending applications.
This solution is less hardware consuming and the algorithms are more simple since the system uses a number of fixed broadband lobes. Many mobile terminals can thereby use the same lobes. However, the number of lobes must be low since the reason to introduce fixed lobes (n in Figure 2) is to reduce the amount of hardware. This implies of course a performance degradation compared to the above mentioned flexible lobe shaping system, i.e. the lobes can only be directed in fixed determined directions as can be seen in Figure 3. The degradation can be limited if a very high number of fixed lobes are formed. However, as mentioned before, the number of fixed lobes must be low to reduce the amount of hardware. Interference cancellation by radiation pattern nulling is not possible with the system of Figure 2, which results in a performance degradation in comparison to the system of Figure 1. Abrupt lobe switching can interfere with the transmission. The need for resyn- chronization after a lobe switch due to phase disturbance is possible. To summarize the situation, the flexible lobe shaping system has high lobe direction performance but is expensive and uses advanced algorithms, and the fixed lobe shaping network is cheap, uses simple algorithms but has low lobe direction performance.
The object of the present invention is to overcome the drawbacks of the above discussed systems, i.e. to create a system which is cheap, uses simple algorithms, has high lobe direction performance and supports interference cancellation.
Summary of the invention The above object is achieved by means of a method for lobe shifting in a telecommunication system and an arrangement in a lobe forming network as claimed in claim 1 and 9 respectively.
The method and the arrangement in accordance with the present invention have many advantages in comparision with the above discussed systems. These advantages are for example:
- simple and cheap solution;
- simple algorithms can be used (much simpler than for the flexible lobe system);
- tracking of the mobile terminal by the use of fine tuned fixed lobes; - no abrupt lobe switching and no need for ^synchronization after lobe switch;
- high performance (equal to the flexible lobe solution);
- interference cancellation possible (not possible in an ordinary fixed lobe system): - no cross-over zone with lower gain between the lobes since the lobes can be directed in arbitrary direction;
- full steerable lobes in all directions;
- considerably reduced hardware in relation to the flexible lobe system;
- the number of lobes can be reduced compared to fixed lobe shaping network.
Other characteristics of the invention are set out in the dependent claims.
Brief description of the drawings
A detailed description of the invention will now be given with reference to the following drawings, of which:
Figure 1 is a schematic diagram of the flexible lobe shaping system; Figure 2 is a schematic block diagram of a fixed lobe shaping unit: Figure 3 discloses lobe directions of the fixed lobe shaping unit in Figure 2; Figure 4 is a block diagram of the seamless lobe forming network in accordance with the present invention;
Figure 5 discloses interpolation between fixed lobes according to the present invention;
Figure 6 discloses cancellation of a side lobe in accordance with the present invention; Figure 7 is a realization on component level of the block diagram of Figure 4;
Figure 8 is a I-Q Vector Modulator.
Detailed description of an embodiment of the present invention
The invention is based on the fixed lobe shaping system, the system of which uses coarse weighting of the lobe through the fixed lobe forming network. However, the invention lies in the splitter and the fine tuning device as can be seen in Figure 4. The antenna array has preferably eight antenna elements, the function of which is explained in the above mentioned pending application. Antenna System. The parts in broken lines are multiple, i.e. the number of these is determined by the number of transceivers. The coarse part of Figure 4 consists of lobe shaping units, which generate lobes in fixed directions. These lobe shaping units have 8 fixed complex weight coefficients (magnitude- and phase weights), which coefficients are multiplied with a signal on its way to (or on its way from) each one of the antenna element. The complex weight coefficients are chosen so that the multiplied signals from/to the antenna elements interact with high gain in a fixed direction. i.e. fixed main lobe (LFl, Figure 6) and interfere with low gain in all other directions (SL1, side lobes, Figure 6). The core of the invention lies in the fine tuning device using an arbitrary number (LFl-LFn) of fixed lobes simultaneously. This results in a interpolation between the fixed lobes (LFl-LFn). This implies that there will be no need for resynchronization after lobe switch and no abrupt lobe switching will occur. Thus, the invention enables tracking of mobile terminals by the use of fine tuned fixed lobes. The invention is used both in up- and downlink. In the uplink a combiner is used and in the downlink a splitter is used. The implementation can of course differ but the inventive principle is the same. The splitter in Figure 4 divides the effect from TRX between the inputs of the fine tuning device. Normally the effect is equally divided between the inputs of the fine tuning device. It should be realized that when TRX is receiving a combiner is used to combine the signal effect from the outputs of the fine tuning device. The fine tuning device in Figure 4 comprises modulators. The purpose of these modulators is to modulate the phase and the amplitude of the signal. A preferable modulator is for example the I-Q vector modulator as can be seen in Figure 8. The I-Q vector modulator is a unique combination of active and passive devices that is, in theory, ideally suited for simultaneous control of amplitude and phase. The modulators (1-n) are used to achieve lobe interpolation and interference cancellation of side lobes. Instead of modulators, PIN diode attenuators can be used for lobe interpolation, However, PIN diode attenuators cannot achieve interference cancellation.
Let us assume that we will create a lobe (LF interpolation) between the fixed lobes LFl and LF2 in Figure 5. The signal from the splitter in Figure 4 is divided in n equally large signals, which are delivered in phase to the modulators 1-n in the fine tuning device. To create the lobe interpolation between LFl and LF2, the attenuation of modulator 1/PIN diode attenuator 1 and modulator 2/PIN diode attenuator 2 is set to a minimum value, after which lobes LFl and LF2 are added to create the interpolation lobe (LF interpolation) as can be seen in Figure 5. In this case, the attenuation of the other modulators 3-n/PIN diode attenuator 3-n is set to a maximum value. Thus, in order to achieve an arbitrary lobe interpolation between two different lobes (LFl - LFn), signals in the modulators/PIN diode attenuators 1-n are amplitude modulated and the fixed lobes (LFl - LFn) associated with the amplitude modulated signals are added together to create the lobe interpolation (LF interpolation). This transition between fixed lobes and interpolated lobes is referred to as seamless lobe shifting.
It should of course be realized that the signal from the splitter can be divided equally or unequally to the modulators 1-n in the fine tuning device. This implies that you can combine an arbitrary number of lobes (LFl-LFn), e.g. lobes LFl, LF3. LF4, LF6 and LFn, to create an optional antenna pattern, e.g. a wide lobe.
The lobe forming network in Figure 4 can also be used for interference cancellation as can be seen in Figure 6 provided that a phase-modulator is used, for example an I-Q vector modulator (Figure 8). By adjusting the phase and amplitude of the weights, one fixed lobe can be used to suppress the radiation pattern of another lobe.
Interference cancellation will now be described by way of an example with reference to Figure 6. Figure 6 A discloses a situation where a mobile terminal MT1 uses the channel of LFl for communication with the base station. Side lobe SLl originating from main lobe LF 1 disturbs the mobile terminal MT2 which is communicating on the same channel. In this case most of the signal effect is distributed in the fixed lobe LFl . In order to suppress side lobe SLl the signal of for example modulator 4 in the fine tuning device of Figure 4 is phase- and amplitude modulated so that the lobe LF4 associated with said modulated signal has the same amplitude as side lobe SLl but is in counterphase (180° phase shifted) in relation to side lobe SLl as may be seen in Figure 6B. It should of course be appreciated that lobe LF4 radiates in the same direction as side lobe SLl but is in counterphase in relation to lobe SLl implying an interference cancellation. This cancellation is only figuratively disclosed in Figure 6B. Thus, by phase- (180°) and amplitude modulating the signal in modulator 4, the lobe LF4 will suppress the side lobe SLl and the side lobe SLl will be eliminated as can be seen in Figure 6C. Thus, in Figure 6C the mobile terminal MT2 does not disturb MT1 and vice versa, since the side lobe SLl has been suppressed.
Figure 7 is a circuit diagram of the invention in accordance with Figure 4. Figure 7 discloses a system with two TRX (10, 20, transmitter/receiver), four fixed lobes and four dipole columns per antenna. It should of course be realized that an arbitrary number of TRX, lobes and dipole columns could be used. The splitter 11 is preferably an ordinary Wilkinson splitter/combiner, which is described in Microwave Transistor Amplifiers, Guillermo Gonzales ISDN 0-13-254 335-4. It should be emphasized that the splitter 11 can be used for both splitting and combining due to transmission or reception of radio signals. In Figure 7 the signal is divided by four in the splitter 11. The modulators 12 are PIN diode attenuators or vector modulators as described above. The modulators 12 are connected to combiners 16 combining signals from the two TRX 10, 20. The combiners 16 are connected to dividers 13 which divide the signals by a factor 4. The dividers 13 are connected to a delay line and fixed attenuators 14 or vector modulators 14, which in turn are connected to combiners 15. Combiners 15 are connected to amplifiers 17. The signals from combiners 15 are amplified in amplifiers 17 and are then fed to the antenna element 19 via the duplex filter 18 for transmission. In principle, the same system (slightly modified) is used for the reception of radio signals. The above mentioned is only to be considered as an advantageous embodiment of the present invention, and the scope of the invention is given by the following claims.

Claims

I . A method for lobe shifting in a telecommunication system, characterized in that a combination of lobes (LF l-LFn) is used to create an arbitrary antenna pattern.
2. A method as claimed in claim 1, characterized in that said arbitrary antenna pattern is used to suppress arbitrary side lobes (SLl).
3. A method as claimed in claim 1 or 2, characterized in that said combination is an interpolation between fixed lobes (LFl-LFn)
4. A method as claimed in claim 3, characterized in that said interpolation is used between fixed lobes (LFl-LFn) to create an interpolated lobe (LF interpolation) with an arbitrary direction between said fixed lobes (LFl-LFn).
5. A method as claimed in claim 4, characterized in that said interpolation between said fixed lobes (LFl-LFn) is achieved by the addition of said fixed lobes, which creates said interpolated lobe (LF interpolation).
6. A method as claimed in claim 5, characterized in that said interpolation
(LF interpolation) between fixed lobes (LFl, LF2) is achieved by the steps of:
- amplitude -modulating signals associated with said fixed lobes (LFl, LF2);
- adding said fixed lobes (LFl, LF2) together.
7. A method as claimed in claim 6, characterized in that a fine tuning device is used to achieve said amplitude modulation of said signals, associated with said fixed lobes (LFl, LF2), by adjusting amplitude weight coefficients.
8. A method as claimed in any of claims 3-7, characterized in that an interference cancellation is achieved by adjusting phase- and amplitude weight coefficients associated with at least one fixed lobe (LF4), which at least one fixed lobe (LF4) is used to suppress the radiation pattern of other lobes (SLl).
9. An arrangement in a lobe forming network, characterized in that a fine tuning device is arranged to combine lobes (LFl-LFn) with each other to create an arbitrary antenna pattern.
10. An arrangement as claimed in claim 9, characterized in that said arbi- trary antenna pattern is used to suppress arbitrary side lobes (SLl).
I I . An arrangement as claimed in any of claims 9 or 10, characterized in that said combination is an interpolation between fixed lobes (LFl-LFn).
12. An arrangement as claimed in claim 11, characterized in that a fine tuning device is arranged to achieve interpolation between fixed lobes (LFl-LFn) to create an interpolated lobe (LF interpolation) with an arbitrary direction between said fixed lobes (LFl-LFn).
13. An arrangement as claimed in claim 12, characterized in that said fine tuning device comprises modulators (1-n) arranged to amplitude-modulate signals associated with said fixed lobes, wherein said fixed lobes (LFl-LFn) are added together in an adder to form said interpolated lobe (LF interpolation).
14. An arrangement as claimed in claim 13, characterized in that said modulators (1-n) adjust amplitude weight coefficients associated with said fixed lobes (LF 1 , LF2) in order to create said interpolated lobe (LF interpolation) between said fixed lobes (LFl, LF2).
15. An arrangement as claimed in claim 14, characterized in that a splitter divides signals from a TRX in equally large signals (n), which equally large signals (n) are delivered in phase to said modulators (1-n) in said fine tuning device.
16. An arrangement as claimed in any of claims 13-15, characterized in that said modulators (1-n) modulate the amplitude- and the phase weight coefficients associated with said fixed lobes.
17. An arrangement as claimed in claim 16, characterized in that said modulators are I-Q vector modulators.
18. An arrangement as claimed in any of claims 13-15, characterized in that said modulators are PIN-diode attenuators.
19. An arrangement as claimed in any of claims 11, 16-17, characterized in that said modulators adjust the phase- and amplitude weight coefficients which coefficients correspond to fixed lobes (LF4), wherein said fixed lobes (LF4) are used to suppress the radiation pattern of lobes (SLl), preferably interfering side lobes.
20. An arrangement as claimed in claim 19, characterized in that a modulator (4) in said fine tuning device adjusts its phase- and amplitude weight coefficients in order to phase- and amplitude modulate a signal associated with a fixed lobe (LF4), wherein said fixed lobe (LF4) is used to suppress a side lobe (SLl).
PCT/SE1998/001892 1997-10-20 1998-10-20 Method and arrangement in a telecommunication system WO1999021292A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU96592/98A AU9659298A (en) 1997-10-20 1998-10-20 Method and arrangement in a telecommunication system
EA200000435A EA200000435A1 (en) 1997-10-20 1998-10-20 METHOD AND DEVICE IN THE COMMUNICATION SYSTEM

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9703823A SE9703823D0 (en) 1997-10-20 1997-10-20 Method for seamless lobe shifting and interference cancellation
SE9703823-6 1997-10-20
SE9800372-6 1998-02-10
SE9800372A SE516298C2 (en) 1997-10-20 1998-04-20 Procedure and arrangement for lobby tea in a telecommunication system

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Publication Number Publication Date
WO1999021292A2 true WO1999021292A2 (en) 1999-04-29
WO1999021292A3 WO1999021292A3 (en) 1999-07-08

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AU (1) AU9659298A (en)
EA (1) EA200000435A1 (en)
SE (1) SE516298C2 (en)
WO (1) WO1999021292A2 (en)

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EP1494313A1 (en) * 2003-07-03 2005-01-05 Andrew Corporation Antenna system comprising a coverage antenna and an auxiliary antenna
US7283101B2 (en) 2003-06-26 2007-10-16 Andrew Corporation Antenna element, feed probe; dielectric spacer, antenna and method of communicating with a plurality of devices
GB2444980B (en) * 2006-12-22 2012-02-22 Deltenna Ltd Antenna system
GB2483826A (en) * 2006-12-22 2012-03-21 Deltenna Ltd Antenna system with independent beam pattern control for multiple users.

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US7283101B2 (en) 2003-06-26 2007-10-16 Andrew Corporation Antenna element, feed probe; dielectric spacer, antenna and method of communicating with a plurality of devices
US7498988B2 (en) 2003-06-26 2009-03-03 Andrew Corporation Antenna element, feed probe; dielectric spacer, antenna and method of communicating with a plurality of devices
US7659859B2 (en) 2003-06-26 2010-02-09 Andrew Llc Antenna element, feed probe; dielectric spacer, antenna and method of communicating with a plurality of devices
EP1494313A1 (en) * 2003-07-03 2005-01-05 Andrew Corporation Antenna system comprising a coverage antenna and an auxiliary antenna
GB2444980B (en) * 2006-12-22 2012-02-22 Deltenna Ltd Antenna system
GB2483826A (en) * 2006-12-22 2012-03-21 Deltenna Ltd Antenna system with independent beam pattern control for multiple users.
GB2483826B (en) * 2006-12-22 2012-05-30 Deltenna Ltd Antenna system
US8417295B2 (en) 2006-12-22 2013-04-09 Deltenna Limited Antenna system

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EA200000435A1 (en) 2000-12-25
CN1279846A (en) 2001-01-10
SE516298C2 (en) 2001-12-17
SE9800372D0 (en) 1998-02-10
SE9800372L (en) 1999-04-21
WO1999021292A3 (en) 1999-07-08
AU9659298A (en) 1999-05-10

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