WO2001054312A1 - Procede de determination de la direction d'arrivee et dispositif radiorecepteur - Google Patents
Procede de determination de la direction d'arrivee et dispositif radiorecepteur Download PDFInfo
- Publication number
- WO2001054312A1 WO2001054312A1 PCT/JP2001/000249 JP0100249W WO0154312A1 WO 2001054312 A1 WO2001054312 A1 WO 2001054312A1 JP 0100249 W JP0100249 W JP 0100249W WO 0154312 A1 WO0154312 A1 WO 0154312A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- arrival
- received
- directivity
- received signal
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 9
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 239000013598 vector Substances 0.000 description 5
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/38—Systems for determining direction or deviation from predetermined direction using adjustment of real or effective orientation of directivity characteristic of an antenna or an antenna system to give a desired condition of signal derived from that antenna or antenna system, e.g. to give a maximum or minimum signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
-
- 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
- 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
- H04B7/08—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
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
-
- 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
Definitions
- the present invention relates to a direction-of-arrival estimation method using an array antenna and a wireless receiver.
- FIG. 1 is a block diagram showing a configuration of a conventional radio receiving apparatus using an array antenna.
- the conventional radio receiving apparatus has receiving units 10-1 to 10-N of the number of channels to be received.
- Receiving units 1 0— 1 to 10 0—N have the same number of despreading sections 12 2 — :! as the number of antenna elements of array antenna 11.
- 1 1 2 — M and each despreading unit 1 2 — 1 1 1 2 Estimated by the direction of arrival estimator 13, which estimates the direction of arrival of the signal based on the output of 1 M, and estimated by the direction of arrival estimator 13 Directivity is formed in the direction of arrival, and each despreading section 1 2— :! It mainly comprises a beamformer 14 for passing the output of ⁇ 12-M, and a channel receiving unit 15 for extracting a channel signal from the output of the beamformer 14.
- the array antenna has a configuration in which a plurality of antenna elements are linearly arranged at intervals of a half wavelength of the carrier frequency.
- a beam search method will be described as an example of an arrival direction estimation method.
- the input signal vector X (t) of the antenna is represented by the following equation (1).
- X (t) [[ ⁇ (t), xl (t), ⁇ , xn (t)] T... (1) Also, a vector having a peak in the ⁇ direction (called a steering vector) a (Is represented by equation (2).
- Beamforming in an array antenna is obtained by multiplying the received signal from each antenna element of the array antenna by the complex amplitude, and giving the desired direction using the result.
- FIG. 2 is a diagram illustrating an example of beamforming.
- base station apparatus 21 has four antenna elements, and forms directivity to communicate with mobile station 22 and mobile station 23.
- the input signal vectors of the four antenna elements are expressed by Expression (4) using Expression (1).
- the array antenna of the base station apparatus 21 forms a directivity having a large gain in the ⁇ direction.
- an array antenna in which four antenna elements are linearly arranged has the maximum gain in the 0 direction, and the gain is less than half of the maximum gain at an angle of 22.5 ° or more from the 0 direction.
- beamforming is performed via each antenna element of the array antenna.
- the signals received through each antenna element are phase-rotated at an arbitrary angle and combined to form directivity.
- the signal received via each antenna element is split into a plurality of signals, and different combining is performed.
- Directivity having a large gain can be formed in a plurality of different directions. As a result, it is possible to form appropriate directivity for performing communication with a plurality of communication partners.
- the beam 24 in the 0 direction is used for communication with the mobile station 22 in the 0 direction
- the beam 25 in the ⁇ direction is used for communication with the mobile station 23 in the ⁇ direction. It is possible to do.
- the base station apparatus 21 can receive the signals of a plurality of communication partners individually by performing the processing by providing the receiving unit for each communication partner with the signal output from the beamformer.
- An object of the present invention is to reduce the circuit scale and to prevent the reception quality from deteriorating even when a large number of mobile stations are adjacent to each other and the accuracy of signal arrival direction estimation is degraded.
- An object of the present invention is to provide an estimation method and a wireless receiving device. The purpose of this is to determine how the signal arrives from the received signal before separation for each channel. The intensity distribution of the received signal with respect to the direction is determined, the direction of arrival of the signal is assumed for each band from this intensity distribution, and the directivity of the antenna is determined and received.
- FIG. 1 is a block diagram showing a configuration of a conventional wireless receiving apparatus
- FIG. 2 is a diagram showing an example of beam forming
- FIG. 3 is a block diagram illustrating a configuration of a wireless reception device according to one embodiment of the present invention.
- FIG. 4 is a diagram illustrating an operation of the wireless reception device according to one embodiment of the present invention.
- FIG. 5 is a diagram showing a spatial spectrum of the entire reception signal before despreading in the wireless reception device according to one embodiment of the present invention
- FIG. 6 is a diagram showing a spatial spectrum of ch 2 after despreading in the wireless receiver according to one embodiment of the present invention.
- FIG. 7 is a diagram showing a beam pattern in the wireless reception device according to one embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration of the wireless reception device according to one embodiment of the present invention.
- the radio receiving apparatus 100 includes a plurality of antenna elements 101 1 to 100, a spatial profile creation unit 102, an arrival direction estimation unit 103, and a plurality of reception units 104 ::! ⁇ 104-4 and consists mainly of.
- the radio receiver 100 can form the directivity of the number of the beam formers 111.
- radio receiving apparatus 100 of the present embodiment sets the maximum value of the number of channels that can be handled to 20 and performs demodulation on receiving units 104-1 to 104-4.
- a case will be described in which signals are allocated to five channels, and the number of beams formed from the antenna elements 101-1 to 101-4 is four.
- the number of antenna elements, the number of despreading units, and the number of channel receiving units are not particularly limited.
- Each of the receiving units 104-1 to 104-4 has a beamformer 111 and a plurality of despreading units 111-:! ⁇ 1 1 2-m and a plurality of channel receivers 1 1 3 _ 1 ⁇ : 1 1 3-m.
- the antenna elements 101_1 to 1004-1-4 use the received wireless signal as a received signal, and the spatial profile creation unit 102 and the reception unit 104-- ;! Output to 110 4—4.
- the spatial profile creation unit 102 uses the received signal before despreading received via the antenna elements 101-1 to 101-4 to determine the intensity distribution of the received signal in the direction of arrival of the signal, that is, Create a spatial profile or spatial information.
- the direction-of-arrival estimating unit 103 based on the spatial information created by the spatial profile creating unit 102, assumes the direction of arrival of the signal transmitted from the communication partner, and receives the information on the direction of arrival. — 1 to 10 4— Outputs by sorting to each direction of arrival.
- Receiving unit 1 0 4— :! 1104-4-4 generate the antenna directivity, that is, the beam, from the information of the direction of arrival, receive the radio signal, and multiply the received signal by the spreading code corresponding to the signal in the direction of arrival. Separate the signals of each channel.
- the beamformer 111 combines the reception signals output from the antenna elements 101-1 to 101-4 based on the information on the direction of arrival by rotating the phases at predetermined angles, and combining the signals transmitted from the direction of arrival. Increase the reception level. As a result, the beamformer 111 generates a beam in the arrival direction of the signal estimated by the arrival direction estimation unit 103.
- the despreading units 1 12-:! to 1 12 -m despread the signal synthesized by the beamformer 111 and output the signals to the channel receiving units 113-1 to 113-m.
- the spreading code used for despreading is the spreading code used for spreading the signal transmitted from the arrival direction.
- the channel receiving unit 1 13—1 to 1 13—m is the despreading unit 1 12— :! Demodulates the signal output from 1 to 12 m.
- the reception units 104-1 to 104-4 can receive signals arriving from substantially the same direction by an antenna forming the same directivity, and obtain a desired signal by separating the signals. it can.
- FIG. 4 is a schematic diagram showing the direction of a communication partner with which the wireless reception device according to the present embodiment communicates.
- the wireless receiving apparatus communicates with a communication partner using 16 channels.
- the communication partners that communicate on the channels chl, ch3, chhl0, and ch19 exist in adjacent directions when viewed from the wireless receiving device.
- the direction-of-arrival estimating unit 103 estimates the direction of arrival as a group G1 with the communication partners communicating on these chl, ch3, chl0, and ch19 channels, performs the same beamform processing, and converts the signals. After extracting, the signal of each channel is extracted by multiplying by the spreading code and despreading.
- the direction-of-arrival estimating unit 103 estimates the direction of arrival as a group G2 with a communication partner that communicates on the channels ch2, ch5, ch9, chl2, and ch17, and performs the same beamform processing. Then, after extracting the signal, the spread code is multiplied to perform despreading, and the signal of each channel is extracted.
- Arrival direction estimating section 103 estimates the direction of arrival as one group G3 with the communication partner that performs communication on these ch0, ch4, and ch7 channels, performs the same beamform processing, and outputs the signal. After extracting, the signal of each channel is extracted by despreading by multiplying by each spreading code.
- the communication partners that communicate on the channels ch6, ch5, ch16, and ch20 exist in adjacent directions when viewed from the wireless receiving device.
- the direction-of-arrival estimating unit 103 estimates the direction of arrival as one group G4 with the communication partners that communicate on the channels ch6, chl5, chl6, and ch20, performs the same beamform processing, and performs signal processing. Then, despreading is performed by multiplying by the spreading code, and the signal of each channel is extracted.
- the radio receiving apparatus of the present embodiment obtains the intensity distribution of the received signal in the direction of arrival of the signal using the received signal before performing the despreading process, and obtains the intensity distribution for each band having a peak.
- the direction of arrival it is possible to estimate the direction of arrival by grouping communication partners present in adjacent directions into one group.
- FIG. 5 is a diagram illustrating an example of a spatial spectrum in which the direction of arrival is estimated using a received signal before despreading processing is performed.
- the vertical axis indicates the square value of the absolute value of the received power value
- the horizontal axis indicates the angle of arrival as viewed from the wireless receiver of the present embodiment.
- Figure 5 Spatial Spectrum In the ram, peaks G1, G2, G3, and G4 appearing in which signals transmitted from adjacent communication partners are combined.
- the radio receiving apparatus measures the arrival directions of these peaks Gl, G2, G3, and G4 to form the directivity of the antenna.
- a beam for band B1 shown in FIG. 5 is generated at the reception unit 104-1
- a beam for band B2 is generated at the reception unit 104-2
- a beam for band B3 is generated at the reception unit 104-2.
- a control means controls m despreading units 121-1 to 121-1 of receiving unit 104-1.
- the spreading code for each of the users chl, ch3, chl9, and ch10 is given to m
- ch2, ch9, and chl2 are given to the five despreading units 12 of the reception unit 22-2.
- the chunk 6, chl 5, and The spreading code is given to each of the users chhl6 and ch20.
- the directivity to be formed may be such that the reception sensitivity becomes zero in the direction of the peak existing in a direction other than the desired arrival direction, that is, the directivity becomes null. This method is also described in, for example, Japanese Patent Application Laid-Open No. Hei 9-261008.
- the receiving apparatus of the present invention reduces the reception intensity of the interference component by forming the directivity of the antenna such that the reception sensitivity becomes zero with respect to the direction of the peak existing in a direction other than the desired arrival direction.
- the SIR Signal to Interference Ratio
- FIG. 6 is a diagram illustrating an example of a beam pattern that is the directivity of an antenna.
- the vertical axis indicates the antenna gain
- the horizontal axis indicates the direction of directivity.
- Figure 6 shows the antenna directivity when receiving a signal coming from peak G2. Is formed.
- the gain is large in the direction of the peak G2.
- the gain is small in the direction of the peaks Gl, G3, and G4, which is a so-called null.
- the gain increases in the direction of the peak G2, and a radio signal arriving from the direction of the peak G2 can be received with a high intensity.
- the radio signal arriving from the directions of the peaks G1, G3, and G4, which is a thousand-dimensional component is By receiving at a weak intensity, a signal from band B2 including a plurality of signals arriving from the direction of peak G2 is received, and a band B1 including a plurality of signals arriving from the direction of peak G1 and a peak G3.
- Signals arriving from band B3 including a plurality of signals arriving from the direction and band B4 including a plurality of signals arriving from the peak G4 direction, that is, interference components can be reduced.
- the signal arriving from the direction of the peak G2, that is, ch2 The ch2 signal can be extracted from the ch5, ch9, chl2, and ch17 channel signals.
- FIG. 7 is a diagram showing an example of a beam pattern after despreading.
- the vertical axis indicates the square value of the absolute value of the received power value
- the horizontal axis indicates the angle of arrival as viewed from the wireless reception device of the present embodiment.
- the spatial spectrum in FIG. 7 is the spectrum after multiplying the received signal by the spreading code corresponding to ch2.
- the peaks G 2 ′ and B 2 ′ including the signal of ch 2 have a high received power value, and the received power values in the other directions are low.
- the intensity distribution of the received signal is generated with respect to the direction of arrival of the signal, and the direction of arrival of the signal is assumed in band units from the intensity distribution.
- the signal required for signal separation is obtained by forming the antenna directivity in units of multiple signals arriving from the receiver and separating the signals. Since it is sufficient that the number of grouped signals is smaller than the number of channels, the circuit scale can be reduced and the cost can be reduced.
- the circuit scale can be reduced and the cost can be reduced.
- the receiving apparatus of the present invention when a large number of mobile stations are adjacent to each other and the accuracy of the direction of arrival estimation is deteriorated, a beam capable of strongly receiving a signal in the direction in which the mobile station exists is generated. By processing a large number of signals at once, it is possible to prevent deterioration in accuracy.
- the present embodiment can be used as a preceding process of a multi-user interference canceller.
- the despreading unit 1 1 2— :! 1 to 11 2 m can be realized by providing an interference component removing unit that separates a desired signal and an interference component from a received signal and subtracts the interference component from the received signal output from the beamformer 11. .
- the case of the code multiplexing method has been described.
- the present invention is not limited to this. Also, by creating a spatial profile with the signal before despreading, the effect of the process gain obtained when performing the steps of spreading and despreading cannot be obtained. Therefore, noise can be removed by averaging the values of the spatial profile over time.
- the intensity distribution of the received signal is generated for the direction of arrival of the signal, the direction of arrival of the signal is assumed in band units from the intensity distribution, and a plurality of signals arriving from substantially the same direction are obtained.
- the circuit size can be reduced by forming and receiving the antenna directivity for each signal unit and separating the signals. Also, many mobile stations Even in the case where it is adjacent and the accuracy of signal arrival direction estimation deteriorates, it is possible to prevent reception quality from deteriorating.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/936,556 US6552684B2 (en) | 2000-01-17 | 2001-01-17 | Direction of arrival estimation method and radio reception apparatus |
EP01901375A EP1161003A4 (en) | 2000-01-17 | 2001-01-17 | METHOD FOR DETERMINING THE ARRIVAL DIRECTION AND RADIO RECEIVER APPARATUS |
AU27041/01A AU2704101A (en) | 2000-01-17 | 2001-01-17 | Arrival direction determining method and radio receiving device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-8292 | 2000-01-17 | ||
JP2000008292A JP2001196835A (ja) | 2000-01-17 | 2000-01-17 | 到来方向推定方法及び無線受信装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001054312A1 true WO2001054312A1 (fr) | 2001-07-26 |
Family
ID=18536583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/000249 WO2001054312A1 (fr) | 2000-01-17 | 2001-01-17 | Procede de determination de la direction d'arrivee et dispositif radiorecepteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US6552684B2 (ja) |
EP (1) | EP1161003A4 (ja) |
JP (1) | JP2001196835A (ja) |
CN (1) | CN1156092C (ja) |
AU (1) | AU2704101A (ja) |
WO (1) | WO2001054312A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3895228B2 (ja) | 2002-05-07 | 2007-03-22 | 松下電器産業株式会社 | 無線通信装置および到来方向推定方法 |
KR101040256B1 (ko) | 2008-11-14 | 2011-06-09 | 엘아이지넥스원 주식회사 | 방탐 정확도가 향상된 신호 방향 탐지 시스템 및 그 방법 |
JP5677452B2 (ja) * | 2010-11-12 | 2015-02-25 | アルプス電気株式会社 | 到来角度算出装置 |
US8774837B2 (en) | 2011-04-30 | 2014-07-08 | John Anthony Wright | Methods, systems and apparatuses of emergency vehicle locating and the disruption thereof |
KR102069209B1 (ko) * | 2018-02-28 | 2020-01-22 | 조선대학교산학협력단 | 도래각 추정 방법 및 장치 |
CN110687528B (zh) * | 2019-10-30 | 2023-05-05 | 海鹰企业集团有限责任公司 | 自适应波束形成器生成方法及系统 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05259950A (ja) * | 1992-03-13 | 1993-10-08 | Nippon Telegr & Teleph Corp <Ntt> | 移動通信用一周波数交互通信方式におけるダイバーシチ方式 |
JPH09219675A (ja) * | 1996-02-14 | 1997-08-19 | Toshiba Corp | 無線通信システムにおける伝搬パス選択方法 |
JPH10126139A (ja) * | 1996-10-18 | 1998-05-15 | Toshiba Corp | アダプティブアンテナ |
JPH10256821A (ja) * | 1997-01-07 | 1998-09-25 | Toshiba Corp | アダプティブアンテナ |
JPH11298445A (ja) * | 1998-04-07 | 1999-10-29 | Nec Corp | Ds−cdmaマルチユーザ干渉キャンセラ装置及びds−cdma通信システム |
JPH11331125A (ja) * | 1997-12-04 | 1999-11-30 | Sanyo Electric Co Ltd | 無線受信システム |
JP2001036451A (ja) * | 1999-07-16 | 2001-02-09 | Nec Corp | Cdmaセルラシステムにおけるパスサーチ回路 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19511751C2 (de) * | 1995-03-30 | 1998-07-09 | Siemens Ag | Verfahren zur Rekonstruktion von durch Mehrwegeausbreitung gestörten Signalen |
JP3009624B2 (ja) | 1996-01-17 | 2000-02-14 | 株式会社エイ・ティ・アール光電波通信研究所 | ディジタルビーム形成装置のためのfir型ディジタルフィルタのフィルタ係数演算装置、ディジタルビーム形成装置のためのfir型ディジタルフィルタ及びディジタルビーム形成装置 |
JP3204111B2 (ja) * | 1996-08-28 | 2001-09-04 | 松下電器産業株式会社 | 指向性制御アンテナ装置 |
JP3716398B2 (ja) | 1998-03-05 | 2005-11-16 | 富士通株式会社 | アレーアンテナによる到来方向推定方法及び該方法を用いたds−cdma受信装置 |
-
2000
- 2000-01-17 JP JP2000008292A patent/JP2001196835A/ja active Pending
-
2001
- 2001-01-17 US US09/936,556 patent/US6552684B2/en not_active Expired - Fee Related
- 2001-01-17 CN CNB018000347A patent/CN1156092C/zh not_active Expired - Fee Related
- 2001-01-17 WO PCT/JP2001/000249 patent/WO2001054312A1/ja not_active Application Discontinuation
- 2001-01-17 EP EP01901375A patent/EP1161003A4/en not_active Withdrawn
- 2001-01-17 AU AU27041/01A patent/AU2704101A/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05259950A (ja) * | 1992-03-13 | 1993-10-08 | Nippon Telegr & Teleph Corp <Ntt> | 移動通信用一周波数交互通信方式におけるダイバーシチ方式 |
JPH09219675A (ja) * | 1996-02-14 | 1997-08-19 | Toshiba Corp | 無線通信システムにおける伝搬パス選択方法 |
JPH10126139A (ja) * | 1996-10-18 | 1998-05-15 | Toshiba Corp | アダプティブアンテナ |
JPH10256821A (ja) * | 1997-01-07 | 1998-09-25 | Toshiba Corp | アダプティブアンテナ |
JPH11331125A (ja) * | 1997-12-04 | 1999-11-30 | Sanyo Electric Co Ltd | 無線受信システム |
JPH11298445A (ja) * | 1998-04-07 | 1999-10-29 | Nec Corp | Ds−cdmaマルチユーザ干渉キャンセラ装置及びds−cdma通信システム |
JP2001036451A (ja) * | 1999-07-16 | 2001-02-09 | Nec Corp | Cdmaセルラシステムにおけるパスサーチ回路 |
Also Published As
Publication number | Publication date |
---|---|
US6552684B2 (en) | 2003-04-22 |
US20020158799A1 (en) | 2002-10-31 |
CN1156092C (zh) | 2004-06-30 |
AU2704101A (en) | 2001-07-31 |
CN1358362A (zh) | 2002-07-10 |
EP1161003A4 (en) | 2006-06-21 |
EP1161003A1 (en) | 2001-12-05 |
JP2001196835A (ja) | 2001-07-19 |
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