WO2004109961A3 - Method and apparatus for transceivers in wireless communications using OFDM spread spectrum - Google Patents

Method and apparatus for transceivers in wireless communications using OFDM spread spectrum Download PDF

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Publication number
WO2004109961A3
WO2004109961A3 PCT/IB2004/003262 IB2004003262W WO2004109961A3 WO 2004109961 A3 WO2004109961 A3 WO 2004109961A3 IB 2004003262 W IB2004003262 W IB 2004003262W WO 2004109961 A3 WO2004109961 A3 WO 2004109961A3
Authority
WO
WIPO (PCT)
Prior art keywords
ofdm
channel
synchronization
algorithm
frequency offset
Prior art date
Application number
PCT/IB2004/003262
Other languages
French (fr)
Other versions
WO2004109961A2 (en
WO2004109961A9 (en
Inventor
Jin H Lee
Original Assignee
Jin H Lee
Canada Interworld Telecomm 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 Jin H Lee, Canada Interworld Telecomm Inc filed Critical Jin H Lee
Publication of WO2004109961A2 publication Critical patent/WO2004109961A2/en
Publication of WO2004109961A9 publication Critical patent/WO2004109961A9/en
Publication of WO2004109961A3 publication Critical patent/WO2004109961A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

This invention is about a method and apparatus for wireless transceiver to send and receive data packets with high data rate. The apparatus may include a base-band processor using OFDM (Orthogonal Frequency Division Multiplexing). The orthogonal nature of the OFDM sub-channels allows them to be overlapped, there by increasing the spectral efficiency. In other words, as orthogonality is maintained, there will be no inter-channel interference in an OFDM system. In any real implementation, however, frequency offset tracking and recovery, phase error estimation and compensation etc.; several factors will cause a certain loss in orthgonality. Designing a system that will minimize these losses therefore becomes a major technical focus. In this invention, synchronization, channel estimation and FEC techniques are suggested to have better performance in the radio channel environment. The algorithm and method for coarse and fine frequency offset compensation, and symbol timing synchronization in the synchronization part of OFDM receiver are included. The apparatus may include channel estimation method with LS (Least Square) algorithm and channel decoder with CSI (Channel State Information).
PCT/IB2004/003262 2003-05-22 2004-04-26 Method and apparatus for transceivers in wireless communications using ofdm spread spectrum WO2004109961A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47245803P 2003-05-22 2003-05-22
US60/472,458 2003-05-22

Publications (3)

Publication Number Publication Date
WO2004109961A2 WO2004109961A2 (en) 2004-12-16
WO2004109961A9 WO2004109961A9 (en) 2005-03-10
WO2004109961A3 true WO2004109961A3 (en) 2006-03-23

Family

ID=33511589

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/003262 WO2004109961A2 (en) 2003-05-22 2004-04-26 Method and apparatus for transceivers in wireless communications using ofdm spread spectrum

Country Status (1)

Country Link
WO (1) WO2004109961A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100375401C (en) * 2005-03-29 2008-03-12 中兴通讯股份有限公司 Narrowband interference eliminating method and apparatus in spread-spectrum system
CN104065447A (en) * 2013-03-22 2014-09-24 联想(北京)有限公司 Information processing method and electronic equipment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EBERLE W ET AL: "80-Mb/s QPSK and 72-Mb/s 64-QAM flexible and scalable digital OFDMtransceiver ASICs for wireless local area networks in the 5-GHz band.", IEEE JOURNAL OF SOLID-STATE CIRCUITS., vol. 36, no. 11, November 2001 (2001-11-01), pages 1829 - 1838 *
ZOU H, MCNAIR B, DANESHRAD B.: "An integrated OFDM receiver for high-speed mobile data communications.", GLOBAL TELECOMMUNICATIONS CONFERENCE., vol. 5, 25 November 2001 (2001-11-25) - 29 November 2001 (2001-11-29), pages 3090 - 3094, XP010747378, DOI: doi:10.1109/GLOCOM.2001.965995 *

Also Published As

Publication number Publication date
WO2004109961A2 (en) 2004-12-16
WO2004109961A9 (en) 2005-03-10

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