WO2009002773A3 - Coherent detection for differentially encoded ofdm systems - Google Patents

Coherent detection for differentially encoded ofdm systems Download PDF

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Publication number
WO2009002773A3
WO2009002773A3 PCT/US2008/067274 US2008067274W WO2009002773A3 WO 2009002773 A3 WO2009002773 A3 WO 2009002773A3 US 2008067274 W US2008067274 W US 2008067274W WO 2009002773 A3 WO2009002773 A3 WO 2009002773A3
Authority
WO
WIPO (PCT)
Prior art keywords
channel
ofdm symbol
soft decision
computed
passed
Prior art date
Application number
PCT/US2008/067274
Other languages
French (fr)
Other versions
WO2009002773A2 (en
Inventor
Nabil Yousef
Original Assignee
Newport Media 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 Newport Media Inc filed Critical Newport Media Inc
Publication of WO2009002773A2 publication Critical patent/WO2009002773A2/en
Publication of WO2009002773A3 publication Critical patent/WO2009002773A3/en

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2075—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the change in carrier phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2331—Demodulator circuits; Receiver circuits using non-coherent demodulation wherein the received signal is demodulated using one or more delayed versions of itself

Abstract

A method and system for coherent detection in which a OFDM symbol is multiplied by the complex conjugate of the previous OFDM symbol, which is obtained by one OFDM symbol delay and a complex conjugation circuit. This soft decision is passed through a QPSK slicer to obtain a hard decision. The soft decision is then divided by the hard decisions. The channel phase change between the two OFDM symbols is then obtained. For the first OFDM symbol, the channel is computed. A channel estimate for each ODFM symbol is computed from corresponding channel estimates and channel phase difference estimates. The channel phase difference between each two OFM symbols is computed. The channel phase difference is passed through an exponent operation and multiplied by the soft decision to obtain a refined soft decision that is then passed through another QPSK slicer to obtain the final hard decision.
PCT/US2008/067274 2007-06-22 2008-06-18 Coherent detection for differentially encoded ofdm systems WO2009002773A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/766,811 US7710857B2 (en) 2007-06-22 2007-06-22 Coherent detection for differentially encoded OFDM systems
US11/766,811 2007-06-22

Publications (2)

Publication Number Publication Date
WO2009002773A2 WO2009002773A2 (en) 2008-12-31
WO2009002773A3 true WO2009002773A3 (en) 2009-02-12

Family

ID=40136359

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/067274 WO2009002773A2 (en) 2007-06-22 2008-06-18 Coherent detection for differentially encoded ofdm systems

Country Status (2)

Country Link
US (1) US7710857B2 (en)
WO (1) WO2009002773A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8750089B2 (en) * 2010-01-05 2014-06-10 Broadcom Corporation Method and system for iterative discrete fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques
CN102928828B (en) * 2012-10-30 2014-08-20 北京理工大学 Phase difference estimation method of distributed radar based on orthogonal waveforms
US9413575B2 (en) 2013-03-15 2016-08-09 Echelon Corporation Method and apparatus for multi-carrier modulation (MCM) packet detection based on phase differences
US9363128B2 (en) 2013-03-15 2016-06-07 Echelon Corporation Method and apparatus for phase-based multi-carrier modulation (MCM) packet detection
US9166837B2 (en) * 2013-06-11 2015-10-20 Qualcomm Incorporated Base station assisted frequency domain equalization
KR102200941B1 (en) * 2014-06-02 2021-01-12 삼성전자주식회사 Transmitter, receiver and controlling method thereof
US20160227532A1 (en) * 2015-02-02 2016-08-04 Shahrnaz Azizi Systems, methods, and devices for signal classification in wireless networks

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7173979B1 (en) * 1998-08-18 2007-02-06 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method and device for transmitting information symbols using a plurality of carriers and method and device for receiving information symbols

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6928120B1 (en) * 2000-09-25 2005-08-09 Cingular Wireless Ii, Llc Methods and apparatus for use in reducing residual phase error in OFDM communication signals
US7184506B2 (en) * 2002-03-30 2007-02-27 Broadcom Corporation Frequency drift and phase error compensation in a VOFDM receiver
CN1846415B (en) * 2003-03-28 2010-08-04 英特尔公司 System and method for two channel frequency offset estimation of OFDM signals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7173979B1 (en) * 1998-08-18 2007-02-06 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Method and device for transmitting information symbols using a plurality of carriers and method and device for receiving information symbols

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EUI-CHEOL LIM ET AL.: "Reliable region decision DDCE and erasure replacement decoding of OFDM system", ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS. APCC 2005, 3 October 2005 (2005-10-03) - 5 October 2005 (2005-10-05), pages 793 - 797, XP010860893 *
HAAS E. ET AL.: "Analysis of Two-Dimensional Differential Demodulation for OFDM", IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE 2000, GLOBECOM'00, 27 November 2000 (2000-11-27) - 1 December 2000 (2000-12-01), pages 751 - 755, XP001017187 *
PAL FRENGER ET AL.: "A Decision Directed Coherent Detector for OFDM", IEEE 46TH VEHICULAR TECHNOLOGY CONFERENCE, 28 April 1996 (1996-04-28) - 1 May 1996 (1996-05-01), pages 1584 - 1588, XP000595798 *

Also Published As

Publication number Publication date
US7710857B2 (en) 2010-05-04
US20080316909A1 (en) 2008-12-25
WO2009002773A2 (en) 2008-12-31

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