CA2183140A1 - Ofdm timing and frequency recovery system - Google Patents

Ofdm timing and frequency recovery system

Info

Publication number
CA2183140A1
CA2183140A1 CA002183140A CA2183140A CA2183140A1 CA 2183140 A1 CA2183140 A1 CA 2183140A1 CA 002183140 A CA002183140 A CA 002183140A CA 2183140 A CA2183140 A CA 2183140A CA 2183140 A1 CA2183140 A1 CA 2183140A1
Authority
CA
Canada
Prior art keywords
frequency
timing
found
timing errors
drift
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
CA002183140A
Other languages
French (fr)
Other versions
CA2183140C (en
Inventor
Grant Mcgibney
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.)
Telecommunications Res Labs
Original Assignee
Telecommunications Res Labs
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 Telecommunications Res Labs filed Critical Telecommunications Res Labs
Priority to CA002347899A priority Critical patent/CA2347899C/en
Priority to CA002183140A priority patent/CA2183140C/en
Priority to US08/696,315 priority patent/US5889759A/en
Publication of CA2183140A1 publication Critical patent/CA2183140A1/en
Priority to US09/236,496 priority patent/US6021110A/en
Application granted granted Critical
Publication of CA2183140C publication Critical patent/CA2183140C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04L27/2662—Symbol 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
    • 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
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2679—Decision-aided

Abstract

A synchronizing apparatus for a differential OFDN
receiver that simultaneously adjust the radio frequency and sample clock frequency using a voltage controlled crystal oscillator to generate a common reference frequency. Timing errors are found by constellation rotation. Subcarrier signals are weighted by using complex multiplication to find the phase differentials and then the timing errors.
The reference oscillator is adjusted using the timing errors. Slow frequency drift may be compensated using an integral of the timing error. Frequency offset is found using the time required for the timing offset to drift from one value to another.
CA002183140A 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system Expired - Fee Related CA2183140C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002347899A CA2347899C (en) 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system
CA002183140A CA2183140C (en) 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system
US08/696,315 US5889759A (en) 1996-08-12 1996-08-13 OFDM timing and frequency recovery system
US09/236,496 US6021110A (en) 1996-08-12 1999-01-26 OFDM timing and frequency recovery system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002183140A CA2183140C (en) 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system
US08/696,315 US5889759A (en) 1996-08-12 1996-08-13 OFDM timing and frequency recovery system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002347899A Division CA2347899C (en) 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system

Publications (2)

Publication Number Publication Date
CA2183140A1 true CA2183140A1 (en) 1998-02-13
CA2183140C CA2183140C (en) 2001-11-20

Family

ID=25678618

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002183140A Expired - Fee Related CA2183140C (en) 1996-08-12 1996-08-12 Ofdm timing and frequency recovery system

Country Status (2)

Country Link
US (2) US5889759A (en)
CA (1) CA2183140C (en)

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Also Published As

Publication number Publication date
US5889759A (en) 1999-03-30
CA2183140C (en) 2001-11-20
US6021110A (en) 2000-02-01

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