WO1998001961A3 - Frequency domain signal reconstruction in sampled digital communications systems - Google Patents

Frequency domain signal reconstruction in sampled digital communications systems Download PDF

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Publication number
WO1998001961A3
WO1998001961A3 PCT/SE1997/001248 SE9701248W WO9801961A3 WO 1998001961 A3 WO1998001961 A3 WO 1998001961A3 SE 9701248 W SE9701248 W SE 9701248W WO 9801961 A3 WO9801961 A3 WO 9801961A3
Authority
WO
WIPO (PCT)
Prior art keywords
echo
frequency domain
sampling
digital communications
phase
Prior art date
Application number
PCT/SE1997/001248
Other languages
French (fr)
Other versions
WO1998001961A2 (en
Inventor
Antoni Fertner
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to AU37124/97A priority Critical patent/AU3712497A/en
Priority to EP97933948A priority patent/EP0908020A2/en
Priority to CA002259609A priority patent/CA2259609A1/en
Publication of WO1998001961A2 publication Critical patent/WO1998001961A2/en
Publication of WO1998001961A3 publication Critical patent/WO1998001961A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers

Abstract

In a digital communications system, a sampled signal is precisely reconstructed (rather than approximated) even in situations where the phase of the sampling signal is adjusted. More particularly, the sampled signal is compensated in the frequency domain for phase adjustements to the sampling instance in the time domain. In the context of echo cancellation, an echo transfer function is generated representing the echo channel impulse response. Aliased components present in the echo impulse response are specifically identified and compensated for in the frequency domain by treating each spectral filter coefficient of the echo transfer function as the sum of a baseband component and an aliased component. In addition to accurately compensating for sampling phase adjustments, this technique considerably relaxes traditional sampling constraints.
PCT/SE1997/001248 1996-07-09 1997-07-08 Frequency domain signal reconstruction in sampled digital communications systems WO1998001961A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU37124/97A AU3712497A (en) 1996-07-09 1997-07-08 Frequency domain signal reconstruction in sampled digital communications systems
EP97933948A EP0908020A2 (en) 1996-07-09 1997-07-08 Frequency domain signal reconstruction in sampled digital communications systems
CA002259609A CA2259609A1 (en) 1996-07-09 1997-07-08 Frequency domain signal reconstruction in sampled digital communications systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/679,387 US5793801A (en) 1996-07-09 1996-07-09 Frequency domain signal reconstruction compensating for phase adjustments to a sampling signal
US08/679,387 1996-07-09

Publications (2)

Publication Number Publication Date
WO1998001961A2 WO1998001961A2 (en) 1998-01-15
WO1998001961A3 true WO1998001961A3 (en) 1998-04-23

Family

ID=24726719

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001248 WO1998001961A2 (en) 1996-07-09 1997-07-08 Frequency domain signal reconstruction in sampled digital communications systems

Country Status (5)

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US (1) US5793801A (en)
EP (1) EP0908020A2 (en)
AU (1) AU3712497A (en)
CA (1) CA2259609A1 (en)
WO (1) WO1998001961A2 (en)

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Also Published As

Publication number Publication date
AU3712497A (en) 1998-02-02
US5793801A (en) 1998-08-11
EP0908020A2 (en) 1999-04-14
CA2259609A1 (en) 1998-01-15
WO1998001961A2 (en) 1998-01-15

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