CA2433660A1 - A system for a smart antenna - Google Patents
A system for a smart antenna Download PDFInfo
- Publication number
- CA2433660A1 CA2433660A1 CA 2433660 CA2433660A CA2433660A1 CA 2433660 A1 CA2433660 A1 CA 2433660A1 CA 2433660 CA2433660 CA 2433660 CA 2433660 A CA2433660 A CA 2433660A CA 2433660 A1 CA2433660 A1 CA 2433660A1
- Authority
- CA
- Canada
- Prior art keywords
- phase
- signal
- phase shift
- shift signal
- receiver
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
-
- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A system for a smart antenna is provided. The smart antenna system includes a plurality of antennas, a receiver section, a transmitter section and a controller. The controller outputs phase shift signals. The receiver section includes a plurality of mixers and current sources. The corresponding phase shift signal and current source are applied to each mixer in the receiver section. The transmitter section includes a plurality of mixers and current sources. The corresponding phase shift signal and current source are applied to each mixer in the transmitter section.
Description
A System for a Smart Antenna FIELD OF THE INVENTION:
This invention relates to a signal processing, more particularly to a system for a smart antenna.
SUMMARY OF THE INVENT10N:
It is an object of the invention to provide a novel system for a smart antenna that obviates or mitigates at least one of the disadvantages of existing systems.
In accordance with an aspect of the present invention, there is provided a receiver for a smart antenna system which includes: a plurality of antennas; a controller for providing phase shift signals; and a receiver section having a plurality of mixers and current sources. Each of the mixers is provided for mixing an input signal iL. p ~' g S~rvrv ~'r ~G, n,vr~npn.,rvdirvg ph~~G ~'I lrft ~Ignai fr yr i i me cvr r e~ Oi l ii ~ a. i~ci i~ ~a vdiu im2 wm ca vm m m . Eaa.h m the current sources is provided for being applied to the corresponding mixer.
T he phase shift signal and the current source control phase and gain of a signal received 20 at the corresponding antenna.
In accordance with a further aspect of the present invention, there is provided a transmitter for a smart antenna system which includes: a plurality of antennas; a controller for providing phase shift signals; and a transmitter section having a plurality 2s of mixers and current sources. Each of the mixers is provided for mixing an iF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section. Each of the current sources is provided for' being applied'to the corresponding mixer. The phase shift signal and the current source control phase and gain of a signal output from the corresponding antenna.
In accordance with a further aspect of the present invention, there is provided a system for a smart antenna. The system includes: a plurality of antennas; a controller for providing phase shift signals which correspond to the antenna sections;
a receiver section having a plurality of mixers and current sources; and a transmitter section having a plurality of mixers and current sources. Each of the mixers in the receiver section is provided for mixing an input signal from the corresponding antenna with the corresponding phase shift signal. Each of the current sources in the receiver section is provided for being applied to the corresponding mixer.
Each of the mixers in the transmitter section is provided for mixing an IF signal with the corresponding phase shift signal to provide a signal to the corresponding antenna section. Each of the current sources in the transmitter section is provided for being applied to the corresponding mixer. The phase shift signal and the current source 1o control phase and gain of a signal from or to the corresponding antenna.
Other aspects and features of the present invention will be readily apparent to those skilled in the art from a review of the following detailed description of preferred embodiments in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRA~JVINGS:
The invention will be further understood from the following description with reference to the drawings in which:
Figure 1 is a diagram showing a smart antenna RF transceiver in accordance with a first embodiment of the present invention;
Figure 2 is a diagram showing a smart antenna RF transceiver in accordance with a second embodiment of the present invention;
Figure 3 is a schematic diagram showing a receiver Section applied to the transceivers of Figures 1 and 2;
Figure 4 is a schematic diagram showing a transmitter section applied to the transceivers of Figures 1 and 2;
Figure 5 is a diagram showing a quadrature receiver section for a quadrature so smart antenna transceiver to which the receiver section of Figure 3 is applied; and Figure 6 is a diagram showing a quadrature trap smitter section for a quadrature smart antenna transceiver to which the tran smitter section of Figure 4 is applied.
DETAILED DESCRIPTION OF THE PREFERRED EME3ODl1VIENTS:
Figure 1 shows a smart antenna RF transceiver 10 in accordance with a first embodiment of fihe present invention. The transceiver 10 includes two antennas A1-A2, a receiver section 12, a transmitter section 14 and a controller 16.
The controller 16 has an oscillator for outputting a signal with frequency fo, and two phase shifters which receives the output of the oscillator and outputs phase shift signals ~~ and ~2 . Each phase shifter performs phase shifting in response to a phase control signal. The outputs ~1 and ~2 of the phase shifters are provided to the mixers of the receiver section 12 and the transmitter section 14.
Figure 2 shows a smart antenna RF transceiver 20 in accordance with a second embodiment of the present invention. The transceiver 20 includes two antennas A1-A2, the receiver section 12, the transmitter section 14 and a controller 22. The controller 22 has an oscillator for outputting a_ signal with frequency fo/2, and the phase shifters which receives the output or' the osc>iilator'and performs 2o phase-shifting. For increasing phase range of the oscillator, a frequency doubter is provided to each phase shifter. The frequency doubters outputs signets ~1 and ~2 .
For higher gain, more than two antennas can be provided. For N antennas (N
is integer), the transceiver (10, 20) has N Low Noise Amplifiers (LNAs), N
Power Amplifiers (PAs) and 2xN mixers.
Figure 3 shows the receiver section 12 of Figures 1 and 2. The phase shift signal d~, and current sourceli control phase and gain of signal provided from one of the antennas. The phase shift signal ~Z and current source Iz control phase and gain of signal provided from the other antennas. These phaselgain controls are necessary for obtaining the best signal to noise or signal to interference ratio from smart antenna system.
Figure 4 shows transmitter section 14 of Figures 1 and 2. The phase shift signal ~, and current source l, control phase and gain of signal provided to one of the antennas. The phase shift signal d~Z and current source l2 control phase and gain of signal provided to the other antenna. These phaselgain controls are necessary for obtaining the best RF radiation pattern from smart antenna system.
Figure 5 shows a quadrature receiver section 30 for a quadrature smart antenna transceiver that has two antennas. The concept of the receiver section 12 is applied to the receiver section 30. The phase shift signals d~, and ~, + 90 , and current source l, control phase and gain of signal provided from one of the antennas.
The phase shift signals c~~ and c~2 + 90 , and current source I2 control phase and gain of signal provided from the other antennas. These phaselgain controls are necessary fcr obtaining the best signal to noise or signal to interference ratio from the smart antenna system.
The quadrature smart antenna transceiver may have more than two antennas, and the receiver section 30 rr~ay have rr~ore t(~ai~ iwo rriiii~ers and iivu current SGurcCS.
Figure 6 shows a quadrature transmitter section 40 for a quadrature smart antenna transceiver that has two antennas. The concept of the transmitter section 14 is applied to the transmitter section 40. The phase shift signals ~, and c~, +
90 , and current source I, control phase and gain of signal provided to one of the antennas.
2o The phase shift signals d~Z and d~2 + 90 , and current source I., control phase and gain of signal provided to the other antenna. These phaselgain controls are necessary for obtaining the best RF radiation pattern from the smart antenna system.
The quadrature smart antenna transceiver may have more than two antennas, and the transmitter section 40 may have more than two mixers and two current 25 sources.
According to the embadiment of the present invention, the best signal to noise or signal to interference ratio from a smart antenna system can be achieved.
According to the embodiment of the present invention, the best RF radiation pattern from a smart antenna system can be achieved.
While particular embodiments of the present invention have been shown and described, changes and modifications may be made to ouch embodiments without departing from the true scope of the invention.
This invention relates to a signal processing, more particularly to a system for a smart antenna.
SUMMARY OF THE INVENT10N:
It is an object of the invention to provide a novel system for a smart antenna that obviates or mitigates at least one of the disadvantages of existing systems.
In accordance with an aspect of the present invention, there is provided a receiver for a smart antenna system which includes: a plurality of antennas; a controller for providing phase shift signals; and a receiver section having a plurality of mixers and current sources. Each of the mixers is provided for mixing an input signal iL. p ~' g S~rvrv ~'r ~G, n,vr~npn.,rvdirvg ph~~G ~'I lrft ~Ignai fr yr i i me cvr r e~ Oi l ii ~ a. i~ci i~ ~a vdiu im2 wm ca vm m m . Eaa.h m the current sources is provided for being applied to the corresponding mixer.
T he phase shift signal and the current source control phase and gain of a signal received 20 at the corresponding antenna.
In accordance with a further aspect of the present invention, there is provided a transmitter for a smart antenna system which includes: a plurality of antennas; a controller for providing phase shift signals; and a transmitter section having a plurality 2s of mixers and current sources. Each of the mixers is provided for mixing an iF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section. Each of the current sources is provided for' being applied'to the corresponding mixer. The phase shift signal and the current source control phase and gain of a signal output from the corresponding antenna.
In accordance with a further aspect of the present invention, there is provided a system for a smart antenna. The system includes: a plurality of antennas; a controller for providing phase shift signals which correspond to the antenna sections;
a receiver section having a plurality of mixers and current sources; and a transmitter section having a plurality of mixers and current sources. Each of the mixers in the receiver section is provided for mixing an input signal from the corresponding antenna with the corresponding phase shift signal. Each of the current sources in the receiver section is provided for being applied to the corresponding mixer.
Each of the mixers in the transmitter section is provided for mixing an IF signal with the corresponding phase shift signal to provide a signal to the corresponding antenna section. Each of the current sources in the transmitter section is provided for being applied to the corresponding mixer. The phase shift signal and the current source 1o control phase and gain of a signal from or to the corresponding antenna.
Other aspects and features of the present invention will be readily apparent to those skilled in the art from a review of the following detailed description of preferred embodiments in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRA~JVINGS:
The invention will be further understood from the following description with reference to the drawings in which:
Figure 1 is a diagram showing a smart antenna RF transceiver in accordance with a first embodiment of the present invention;
Figure 2 is a diagram showing a smart antenna RF transceiver in accordance with a second embodiment of the present invention;
Figure 3 is a schematic diagram showing a receiver Section applied to the transceivers of Figures 1 and 2;
Figure 4 is a schematic diagram showing a transmitter section applied to the transceivers of Figures 1 and 2;
Figure 5 is a diagram showing a quadrature receiver section for a quadrature so smart antenna transceiver to which the receiver section of Figure 3 is applied; and Figure 6 is a diagram showing a quadrature trap smitter section for a quadrature smart antenna transceiver to which the tran smitter section of Figure 4 is applied.
DETAILED DESCRIPTION OF THE PREFERRED EME3ODl1VIENTS:
Figure 1 shows a smart antenna RF transceiver 10 in accordance with a first embodiment of fihe present invention. The transceiver 10 includes two antennas A1-A2, a receiver section 12, a transmitter section 14 and a controller 16.
The controller 16 has an oscillator for outputting a signal with frequency fo, and two phase shifters which receives the output of the oscillator and outputs phase shift signals ~~ and ~2 . Each phase shifter performs phase shifting in response to a phase control signal. The outputs ~1 and ~2 of the phase shifters are provided to the mixers of the receiver section 12 and the transmitter section 14.
Figure 2 shows a smart antenna RF transceiver 20 in accordance with a second embodiment of the present invention. The transceiver 20 includes two antennas A1-A2, the receiver section 12, the transmitter section 14 and a controller 22. The controller 22 has an oscillator for outputting a_ signal with frequency fo/2, and the phase shifters which receives the output or' the osc>iilator'and performs 2o phase-shifting. For increasing phase range of the oscillator, a frequency doubter is provided to each phase shifter. The frequency doubters outputs signets ~1 and ~2 .
For higher gain, more than two antennas can be provided. For N antennas (N
is integer), the transceiver (10, 20) has N Low Noise Amplifiers (LNAs), N
Power Amplifiers (PAs) and 2xN mixers.
Figure 3 shows the receiver section 12 of Figures 1 and 2. The phase shift signal d~, and current sourceli control phase and gain of signal provided from one of the antennas. The phase shift signal ~Z and current source Iz control phase and gain of signal provided from the other antennas. These phaselgain controls are necessary for obtaining the best signal to noise or signal to interference ratio from smart antenna system.
Figure 4 shows transmitter section 14 of Figures 1 and 2. The phase shift signal ~, and current source l, control phase and gain of signal provided to one of the antennas. The phase shift signal d~Z and current source l2 control phase and gain of signal provided to the other antenna. These phaselgain controls are necessary for obtaining the best RF radiation pattern from smart antenna system.
Figure 5 shows a quadrature receiver section 30 for a quadrature smart antenna transceiver that has two antennas. The concept of the receiver section 12 is applied to the receiver section 30. The phase shift signals d~, and ~, + 90 , and current source l, control phase and gain of signal provided from one of the antennas.
The phase shift signals c~~ and c~2 + 90 , and current source I2 control phase and gain of signal provided from the other antennas. These phaselgain controls are necessary fcr obtaining the best signal to noise or signal to interference ratio from the smart antenna system.
The quadrature smart antenna transceiver may have more than two antennas, and the receiver section 30 rr~ay have rr~ore t(~ai~ iwo rriiii~ers and iivu current SGurcCS.
Figure 6 shows a quadrature transmitter section 40 for a quadrature smart antenna transceiver that has two antennas. The concept of the transmitter section 14 is applied to the transmitter section 40. The phase shift signals ~, and c~, +
90 , and current source I, control phase and gain of signal provided to one of the antennas.
2o The phase shift signals d~Z and d~2 + 90 , and current source I., control phase and gain of signal provided to the other antenna. These phaselgain controls are necessary for obtaining the best RF radiation pattern from the smart antenna system.
The quadrature smart antenna transceiver may have more than two antennas, and the transmitter section 40 may have more than two mixers and two current 25 sources.
According to the embadiment of the present invention, the best signal to noise or signal to interference ratio from a smart antenna system can be achieved.
According to the embodiment of the present invention, the best RF radiation pattern from a smart antenna system can be achieved.
While particular embodiments of the present invention have been shown and described, changes and modifications may be made to ouch embodiments without departing from the true scope of the invention.
Claims (12)
1. A receiver for a smart antenna system comprising:
a plurality of antennas;
a controller for providing phase shift signals; and a receiver section having a plurality of mixers and current sources, each of the mixers for mixing an input signal from the corresponding antenna with the corresponding phase shift signal, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal received at the corresponding antenna.
a plurality of antennas;
a controller for providing phase shift signals; and a receiver section having a plurality of mixers and current sources, each of the mixers for mixing an input signal from the corresponding antenna with the corresponding phase shift signal, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal received at the corresponding antenna.
2. The receiver according to claim 1, wherein the controller includes an oscillator and a plurality of phase shifters, each of which phase shifts the output of the oscillator in response to a phase control signal.
3. The receiver according to claim 2, wherein the controller further includes a plurality of frequency doubles which correspond to the phase shifters, each of which doubles the phase range of the oscillator.
4. The receiver according to claim 1, wherein the receiver is a quadrature receiver and the phase shift signal has a first phase shift signal and a second phase shift signal which is 90° out of the phase of the first phase shift signal.
5. A transmitter for a smart antenna system comprising:
a plurality of antennas;
a controller for providing phase shift signals; and a transmitter section having a plurality of mixers and current sources, each of the mixers for mixing an IF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal output from the corresponding antenna.
a plurality of antennas;
a controller for providing phase shift signals; and a transmitter section having a plurality of mixers and current sources, each of the mixers for mixing an IF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal output from the corresponding antenna.
6. The transmitter according to claim 5, wherein the controller includes an oscillator and a plurality of phase shifters, each of which phase-shifts the output of the oscillator in response to a phase control signal.
7. The transmitter according to claim 6, wherein the controller further includes a plurality of frequency doubles which correspond to the phase shifters, each of which doubles the phase range of the oscillator.
8. The transmitter according to claim 5, wherein the receiver is a quadrature receiver and the phase shift signal has a first phase shift signal and a second phase shift signal which is 90° out of the phase of the first phase shift signal.
9. A system for a smart antenna comprising:
a plurality of antennas;
a controller for providing phase shift signals which correspond to the antenna sections;
a receiver section having a plurality of mixers and current sources, each of the mixers for mixing an input signal from the corresponding antenna with the corresponding phase shift signal, each of the current sources for being applied to the corresponding mixer; and a transmitter section having a plurality of mixers and current sources, each of the mixers for mixing an IF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal from or to the corresponding antenna.
a plurality of antennas;
a controller for providing phase shift signals which correspond to the antenna sections;
a receiver section having a plurality of mixers and current sources, each of the mixers for mixing an input signal from the corresponding antenna with the corresponding phase shift signal, each of the current sources for being applied to the corresponding mixer; and a transmitter section having a plurality of mixers and current sources, each of the mixers for mixing an IF signal with the correspond phase shift signal to provide a signal to the corresponding antenna section, each of the current sources for being applied to the corresponding mixer, whereby the phase shift signal and the current source control phase and gain of a signal from or to the corresponding antenna.
10. The system according to claim 9, wherein the controller includes an oscillator and a plurality of phase shifters, each of which phase-shifts the output of the oscillator in response to a phase control signal.
11. The system according to claim 10, wherein the controller further includes a plurality of frequency doubles which correspond to the phase shifters, each of which performs frequency doubling of the corresponding phase shift signal.
12. The system according to claim 9, wherein the receiver section is a quadrature receiver section, and the phase shift signal has a first phase shift signal and a second phase shift signal which is 90° out of the phase of the first phase shift signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2433660 CA2433660A1 (en) | 2003-06-26 | 2003-06-26 | A system for a smart antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2433660 CA2433660A1 (en) | 2003-06-26 | 2003-06-26 | A system for a smart antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2433660A1 true CA2433660A1 (en) | 2004-12-26 |
Family
ID=33569456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2433660 Abandoned CA2433660A1 (en) | 2003-06-26 | 2003-06-26 | A system for a smart antenna |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2433660A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
-
2003
- 2003-06-26 CA CA 2433660 patent/CA2433660A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |