FI20115772L - Demodulation of QFDM QAM signals with channel estimation errors - Google Patents

Demodulation of QFDM QAM signals with channel estimation errors Download PDF

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Publication number
FI20115772L
FI20115772L FI20115772A FI20115772A FI20115772L FI 20115772 L FI20115772 L FI 20115772L FI 20115772 A FI20115772 A FI 20115772A FI 20115772 A FI20115772 A FI 20115772A FI 20115772 L FI20115772 L FI 20115772L
Authority
FI
Finland
Prior art keywords
channel estimation
qfdm
demodulation
estimation errors
qam signals
Prior art date
Application number
FI20115772A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Gunes Kurt
Coskun Sahin
Original Assignee
Turkcell Iletisim Hizmetleri Anonim Sirketi
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 Turkcell Iletisim Hizmetleri Anonim Sirketi filed Critical Turkcell Iletisim Hizmetleri Anonim Sirketi
Publication of FI20115772L publication Critical patent/FI20115772L/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/0342—QAM
    • 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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Small-Scale Networks (AREA)

Abstract

The present invention relates to a method, wherein channel estimation errors observed in unequal amplitude constellations in the additive noise and frequency equalization process in OFDM (Orthogonal frequency-division multiplexing) based multi-carrier systems are measured by means of a receiver and a transmitter, new constellations are generated according to the said measurements, and the errors are compensated.
FI20115772A 2008-12-30 2011-07-29 Demodulation of QFDM QAM signals with channel estimation errors FI20115772L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2008/10013A TR200810013A1 (en) 2008-12-30 2008-12-30 OFDM is a method used in communication.
PCT/IB2009/055565 WO2010076699A1 (en) 2008-12-30 2009-12-08 Demodulation of ofdm qam signals with channel estimation errors

Publications (1)

Publication Number Publication Date
FI20115772L true FI20115772L (en) 2011-07-29

Family

ID=42121400

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20115772A FI20115772L (en) 2008-12-30 2011-07-29 Demodulation of QFDM QAM signals with channel estimation errors

Country Status (4)

Country Link
FI (1) FI20115772L (en)
SE (1) SE1150722A1 (en)
TR (2) TR200810013A1 (en)
WO (1) WO2010076699A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6327314B1 (en) 1998-04-01 2001-12-04 At&T Corp. Method and apparatus for channel estimation for multicarrier systems
US7260055B2 (en) 2003-05-30 2007-08-21 Agency For Science, Technology, And Research Method for reducing channel estimation error in an OFDM system

Also Published As

Publication number Publication date
TR200903651A1 (en) 2010-07-21
SE1150722A1 (en) 2011-09-30
WO2010076699A1 (en) 2010-07-08
TR200810013A1 (en) 2010-07-21

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