CA2411457A1 - Transmission system, transmission method, transmission apparatus, and electronic recording medium having recorded therein transmission program - Google Patents

Transmission system, transmission method, transmission apparatus, and electronic recording medium having recorded therein transmission program Download PDF

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Publication number
CA2411457A1
CA2411457A1 CA002411457A CA2411457A CA2411457A1 CA 2411457 A1 CA2411457 A1 CA 2411457A1 CA 002411457 A CA002411457 A CA 002411457A CA 2411457 A CA2411457 A CA 2411457A CA 2411457 A1 CA2411457 A1 CA 2411457A1
Authority
CA
Canada
Prior art keywords
transmission
radio link
carriers
recorded
recording medium
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
CA002411457A
Other languages
French (fr)
Other versions
CA2411457C (en
Inventor
Shingo Suwa
Hiroyuki Atarashi
Sadayuki Abeta
Mamoru Sawahashi
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.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
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 NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of CA2411457A1 publication Critical patent/CA2411457A1/en
Application granted granted Critical
Publication of CA2411457C publication Critical patent/CA2411457C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • H04L25/0228Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0236Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols using estimation of the other symbols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0212Channel estimation of impulse response
    • H04L25/0216Channel estimation of impulse response with estimation of channel length
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/02Channels characterised by the type of signal
    • H04L5/023Multiplexing of multicarrier modulation signals
    • H04L5/026Multiplexing of multicarrier modulation signals using code division
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7115Constructive combining of multi-path signals, i.e. RAKE receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • H04B1/711Interference-related aspects the interference being multi-path interference
    • H04B1/7115Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers

Abstract

The transmission system of the present invention is designed to transmit a plurality of signals between the transmitter and the receiver using a plurality of carriers and comprises a radio link characteristics estimator 4 configured to estimate the characteristics of a radio link between the transmitter and the receiver and a carrier quantity determination unit 3 configured to determine the number of carriers according to the result of the estimate by the radio link characteristics estimator 4. The radio link characteristics estimator 4 estimates the characteristics according to an interval in delay time of multipath signals and the number of the multipath signals. The carrier quantity determination unit 3 determines fewer carriers when multipath interference is small, and determines more carriers when the multipath interference is great.
CA 2411457 2001-11-09 2002-11-08 Transmission system, transmission method, transmission apparatus, and electronic recording medium having recorded therein transmission program Expired - Fee Related CA2411457C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-345171 2001-11-09
JP2001345171A JP3934402B2 (en) 2001-11-09 2001-11-09 Transmission system, transmission method, transmission apparatus, and electronic recording medium recording transmission program

Publications (2)

Publication Number Publication Date
CA2411457A1 true CA2411457A1 (en) 2003-05-09
CA2411457C CA2411457C (en) 2009-01-27

Family

ID=19158560

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2411457 Expired - Fee Related CA2411457C (en) 2001-11-09 2002-11-08 Transmission system, transmission method, transmission apparatus, and electronic recording medium having recorded therein transmission program

Country Status (8)

Country Link
US (1) US7154955B2 (en)
EP (1) EP1311074A1 (en)
JP (1) JP3934402B2 (en)
KR (1) KR100516472B1 (en)
CN (1) CN1238985C (en)
AU (1) AU2002357578B2 (en)
CA (1) CA2411457C (en)
SG (1) SG114581A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7317756B2 (en) 2001-12-06 2008-01-08 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7349439B2 (en) * 2001-12-06 2008-03-25 Pulse-Link, Inc. Ultra-wideband communication systems and methods
US8045935B2 (en) 2001-12-06 2011-10-25 Pulse-Link, Inc. High data rate transmitter and receiver
JP2005012429A (en) * 2003-06-18 2005-01-13 Matsushita Electric Ind Co Ltd Mobile communication terminal and handover control method
US20060013182A1 (en) * 2004-07-19 2006-01-19 Telefonaktiebolaget Lm Ericsson Selective multicarrier CDMA network
US8018930B2 (en) * 2004-10-01 2011-09-13 Qualcomm Incorporated Apparatus and method for receiving packet data on a subset of carrier frequencies in a wireless communication system
US8130781B2 (en) 2005-02-28 2012-03-06 Intellectual Ventures I Llc Method and apparatus for providing dynamic selection of carriers
WO2007023530A1 (en) 2005-08-23 2007-03-01 Mitsubishi Denki Kabushiki Kaisha Wireless communication system and communication apparatus
CN1929360B (en) * 2005-09-07 2010-07-07 都科摩(北京)通信技术研究中心有限公司 Alternating frequency time-sharing duplex communication method
JP4672557B2 (en) * 2006-01-11 2011-04-20 日本電信電話株式会社 Wireless communication apparatus and wireless communication system
JP2008124942A (en) * 2006-11-15 2008-05-29 Nec Corp Wireless communications system, wireless communications device and valid path detection method therefor
EP2640026A1 (en) * 2012-03-16 2013-09-18 Nec Corporation Method for estimating the frequency bandwidth of a communication channel
US9641371B2 (en) 2014-12-31 2017-05-02 Motorola Solutions, Inc Methods and systems for dynamic single-frequency-network-multicast symbol synchronization
US10045346B1 (en) * 2016-08-02 2018-08-07 Sprint Spectrum L.P. Assigning a low-GDV carrier to a high-speed UE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619524A (en) * 1994-10-04 1997-04-08 Motorola, Inc. Method and apparatus for coherent communication reception in a spread-spectrum communication system
SG77607A1 (en) * 1997-08-26 2001-01-16 Univ Singapore A multi-user code division multiple access receiver
US6157820A (en) * 1998-06-12 2000-12-05 Ericsson Inc. Pilot strength measurement and multipath delay searcher for CDMA receiver
US6810070B1 (en) * 2000-01-12 2004-10-26 Ericsson Inc. Selective multi-carrier direct sequence spread spectrum communication systems and methods

Also Published As

Publication number Publication date
US20030092404A1 (en) 2003-05-15
EP1311074A1 (en) 2003-05-14
SG114581A1 (en) 2005-09-28
US7154955B2 (en) 2006-12-26
JP2003152597A (en) 2003-05-23
JP3934402B2 (en) 2007-06-20
CA2411457C (en) 2009-01-27
CN1417966A (en) 2003-05-14
KR100516472B1 (en) 2005-09-22
CN1238985C (en) 2006-01-25
KR20030038486A (en) 2003-05-16
AU2002357578B2 (en) 2008-12-04

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Legal Events

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EEER Examination request
MKLA Lapsed

Effective date: 20131108

MKLA Lapsed

Effective date: 20131108