CA2250427A1 - Method and system for reducing multipath fading in bent-pipe satellite communications systems - Google Patents

Method and system for reducing multipath fading in bent-pipe satellite communications systems

Info

Publication number
CA2250427A1
CA2250427A1 CA002250427A CA2250427A CA2250427A1 CA 2250427 A1 CA2250427 A1 CA 2250427A1 CA 002250427 A CA002250427 A CA 002250427A CA 2250427 A CA2250427 A CA 2250427A CA 2250427 A1 CA2250427 A1 CA 2250427A1
Authority
CA
Canada
Prior art keywords
transmitters
transmitter
downlink
satellite
code
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.)
Granted
Application number
CA002250427A
Other languages
French (fr)
Other versions
CA2250427C (en
Inventor
Matthew J. Sherman
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.)
AT&T Corp
Original Assignee
AT&T Corp
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
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of CA2250427A1 publication Critical patent/CA2250427A1/en
Application granted granted Critical
Publication of CA2250427C publication Critical patent/CA2250427C/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
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system

Abstract

A method and system of forming communication links in a satellite communications system. The satellite communications system includes a plurality of transmitter groups, a satellite and a plurality of downlink receivers. Each tran smitter is associated with only one transmitter group. At least two transmitters of two sep arate transmitter groups are disposed geographically adjacent to each other. Each tran smitter of a transmitter group transmits an uplink communications signal that is a CDMA sig nal having a predetermined code that is selected from a code set assigned to the gro up of transmitters with which the transmitter is associated. Each respective code set is different from other code sets associated with selected groups of transmitters and forms a code set pattern that repeats. The satellite receives the uplink communications signals t ransmitted by the transmitters and transmits each of the received uplink communications sig nals as a downlink communications signal directed to a different receiver of the plurality of downlink receivers, such that each downlink communications signal includes no mo re than one downlink communications signal having a predetermined code such that no subs tantial multipath conditions exist.
CA002250427A 1997-10-17 1998-10-13 Method and system for reducing multipath fading in bent-pipe satellite communications systems Expired - Fee Related CA2250427C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/953,020 US6282179B1 (en) 1997-10-17 1997-10-17 Method and system for reducing multipath fading in bent-pipe satellite communications systems
US08/953,020 1997-10-17

Publications (2)

Publication Number Publication Date
CA2250427A1 true CA2250427A1 (en) 1999-04-17
CA2250427C CA2250427C (en) 2002-05-07

Family

ID=25493472

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002250427A Expired - Fee Related CA2250427C (en) 1997-10-17 1998-10-13 Method and system for reducing multipath fading in bent-pipe satellite communications systems

Country Status (5)

Country Link
US (1) US6282179B1 (en)
EP (1) EP0910177A3 (en)
JP (1) JP4459318B2 (en)
CN (1) CN1215263A (en)
CA (1) CA2250427C (en)

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US8346337B2 (en) 1998-04-30 2013-01-01 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US8974386B2 (en) 1998-04-30 2015-03-10 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US6175752B1 (en) * 1998-04-30 2001-01-16 Therasense, Inc. Analyte monitoring device and methods of use
US8480580B2 (en) 1998-04-30 2013-07-09 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US8465425B2 (en) * 1998-04-30 2013-06-18 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US9066695B2 (en) 1998-04-30 2015-06-30 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US6949816B2 (en) * 2003-04-21 2005-09-27 Motorola, Inc. Semiconductor component having first surface area for electrically coupling to a semiconductor chip and second surface area for electrically coupling to a substrate, and method of manufacturing same
US20080076997A1 (en) * 1998-04-30 2008-03-27 Abbott Diabetes Care, Inc. Analyte monitoring device and methods of use
US8688188B2 (en) * 1998-04-30 2014-04-01 Abbott Diabetes Care Inc. Analyte monitoring device and methods of use
US6813254B1 (en) * 1998-11-25 2004-11-02 Lucent Technologies Inc. Methods and apparatus for wireless communication using code division duplex time-slotted CDMA
US6560471B1 (en) * 2001-01-02 2003-05-06 Therasense, Inc. Analyte monitoring device and methods of use
US7065383B1 (en) * 2002-04-16 2006-06-20 Omri Hovers Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver
US7289826B1 (en) * 2002-04-16 2007-10-30 Faulkner Interstices, Llc Method and apparatus for beam selection in a smart antenna system
US7529525B1 (en) * 2002-04-16 2009-05-05 Faulkner Interstices Llc Method and apparatus for collecting information for use in a smart antenna system
US7978641B2 (en) * 2002-04-29 2011-07-12 The Boeing Company Hybrid TDM/FDM uplink for spot-beam communication system
US7811231B2 (en) 2002-12-31 2010-10-12 Abbott Diabetes Care Inc. Continuous glucose monitoring system and methods of use
KR100780669B1 (en) 2006-03-30 2007-11-30 포스데이타 주식회사 Digital frequency up converting apparatus and method
US8538323B2 (en) * 2006-09-26 2013-09-17 Viasat, Inc. Satellite architecture
WO2008108885A2 (en) * 2006-09-26 2008-09-12 Viasat, Inc. Improved spot beam satellite systems
US9733338B1 (en) 2012-10-08 2017-08-15 The Boeing Company Single satellite geolocation systems and methods
US20140145882A1 (en) * 2012-10-08 2014-05-29 The Boeing Company Geolocation systems and methods

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Publication number Priority date Publication date Assignee Title
JPS54116860A (en) * 1978-03-03 1979-09-11 Nippon Telegr & Teleph Corp <Ntt> Variable power distributor
US4879711A (en) * 1986-08-14 1989-11-07 Hughes Aircraft Company Satellite communications system employing frequency reuse
US5446756A (en) * 1990-03-19 1995-08-29 Celsat America, Inc. Integrated cellular communications system
FR2681199B1 (en) * 1991-09-11 1993-12-03 Agence Spatiale Europeenne METHOD AND DEVICE FOR MULTIPLEXING DATA SIGNALS.
US5394560A (en) * 1992-09-30 1995-02-28 Motorola, Inc. Nationwide satellite message delivery system
US5473601A (en) * 1993-10-21 1995-12-05 Hughes Aircraft Company Frequency reuse technique for a high data rate satellite communication system
US5619503A (en) * 1994-01-11 1997-04-08 Ericsson Inc. Cellular/satellite communications system with improved frequency re-use
US5602833A (en) * 1994-12-19 1997-02-11 Qualcomm Incorporated Method and apparatus for using Walsh shift keying in a spread spectrum communication system
CA2165875C (en) * 1995-12-21 2001-03-13 Gary Beauchamp Intersatellite communications systems

Also Published As

Publication number Publication date
JP4459318B2 (en) 2010-04-28
US6282179B1 (en) 2001-08-28
EP0910177A3 (en) 2001-07-11
JPH11225103A (en) 1999-08-17
CA2250427C (en) 2002-05-07
EP0910177A2 (en) 1999-04-21
CN1215263A (en) 1999-04-28

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Legal Events

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EEER Examination request
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Effective date: 20121015