GB2396501B - Radio transmitter and method of controlling direction of radio-wave emission - Google Patents

Radio transmitter and method of controlling direction of radio-wave emission

Info

Publication number
GB2396501B
GB2396501B GB0405061A GB0405061A GB2396501B GB 2396501 B GB2396501 B GB 2396501B GB 0405061 A GB0405061 A GB 0405061A GB 0405061 A GB0405061 A GB 0405061A GB 2396501 B GB2396501 B GB 2396501B
Authority
GB
United Kingdom
Prior art keywords
radio
wave emission
controlling direction
radio transmitter
transmitter
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.)
Expired - Fee Related
Application number
GB0405061A
Other versions
GB2396501A (en
GB0405061D0 (en
Inventor
Hajime Hamada
Michiharu Nakamura
Yasuyuki Oishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 JP2000045674A external-priority patent/JP4187377B2/en
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of GB0405061D0 publication Critical patent/GB0405061D0/en
Publication of GB2396501A publication Critical patent/GB2396501A/en
Application granted granted Critical
Publication of GB2396501B publication Critical patent/GB2396501B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04B7/08—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
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/38—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna
    • 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
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0226—Transmitters
    • 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
    • H04B7/0615—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 of weighted versions of same signal
    • H04B7/0617—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 of weighted versions of same signal for beam forming
    • 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
    • H04B7/0615—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 of weighted versions of same signal
    • H04B7/0619—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 of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
GB0405061A 2000-02-23 2000-12-20 Radio transmitter and method of controlling direction of radio-wave emission Expired - Fee Related GB2396501B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000045674A JP4187377B2 (en) 2000-02-23 2000-02-23 Radio transceiver and radio wave radiation direction control method
GB0031136A GB2367200B (en) 2000-02-23 2000-12-20 Mobile radio communication system and method of controlling direction of radio wave emission

Publications (3)

Publication Number Publication Date
GB0405061D0 GB0405061D0 (en) 2004-04-07
GB2396501A GB2396501A (en) 2004-06-23
GB2396501B true GB2396501B (en) 2004-11-17

Family

ID=32328034

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0405061A Expired - Fee Related GB2396501B (en) 2000-02-23 2000-12-20 Radio transmitter and method of controlling direction of radio-wave emission

Country Status (1)

Country Link
GB (1) GB2396501B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0902314D0 (en) 2009-02-12 2009-04-01 Trw Ltd Antennas
US8442468B2 (en) * 2010-04-12 2013-05-14 Telefonaktiebolaget L M Ericsson (Publ) Omni-directional sensing of radio spectra
US11381266B1 (en) * 2020-12-31 2022-07-05 Iridium Satellite Llc Wireless communication with interference mitigation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1428682A (en) * 1972-06-22 1976-03-17 Int Standard Electric Corp Elevation-measuring system
WO1997047148A2 (en) * 1996-06-06 1997-12-11 Qualcomm Incorporated Using a signal with increased power for determining the position of a mobile subscriber in a cdma cellular telephone system
WO2001026237A1 (en) * 1999-09-30 2001-04-12 Motorola Inc. Method and apparatus for determining remote unit location using phased array antenna elements
US6292665B1 (en) * 1998-10-08 2001-09-18 Harris Corporation Geolocation of cellular phone using supervisory audio tone transmitted from single base station

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1428682A (en) * 1972-06-22 1976-03-17 Int Standard Electric Corp Elevation-measuring system
WO1997047148A2 (en) * 1996-06-06 1997-12-11 Qualcomm Incorporated Using a signal with increased power for determining the position of a mobile subscriber in a cdma cellular telephone system
US6292665B1 (en) * 1998-10-08 2001-09-18 Harris Corporation Geolocation of cellular phone using supervisory audio tone transmitted from single base station
WO2001026237A1 (en) * 1999-09-30 2001-04-12 Motorola Inc. Method and apparatus for determining remote unit location using phased array antenna elements

Also Published As

Publication number Publication date
GB2396501A (en) 2004-06-23
GB0405061D0 (en) 2004-04-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20151220