EP0486667A1 - Signal de communication comportant un composant pilote de domaine temporel - Google Patents

Signal de communication comportant un composant pilote de domaine temporel

Info

Publication number
EP0486667A1
EP0486667A1 EP91911570A EP91911570A EP0486667A1 EP 0486667 A1 EP0486667 A1 EP 0486667A1 EP 91911570 A EP91911570 A EP 91911570A EP 91911570 A EP91911570 A EP 91911570A EP 0486667 A1 EP0486667 A1 EP 0486667A1
Authority
EP
European Patent Office
Prior art keywords
signal
information signal
pilot
time domain
sample
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.)
Withdrawn
Application number
EP91911570A
Other languages
German (de)
English (en)
Other versions
EP0486667A4 (en
Inventor
Steven C. Jasper
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of EP0486667A1 publication Critical patent/EP0486667A1/fr
Publication of EP0486667A4 publication Critical patent/EP0486667A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • 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
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L27/32—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
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • 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
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3455—Modifications of the signal space to allow the transmission of additional information in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain

Definitions

  • the conversion step further includes converting groups of bits that comprise the original information signal into corresponding multibit symbols.
  • a predetermined plurality of these symbols constitutes a processed information signal sample sequence.
  • Fig. 2 comprises a depiction of a 16 QAM symbol constellation
  • pilot sequences for the various subchannels might be staggered in time relative to each other, as depicted in Fig. 4c, to allow interpolation over time and frequency of estimated pilot references for use in recovering symbols for all subchannels.
  • a plurality of QAM signals be substantially simultaneously provided, in a manner frequency offset from one another, wherein at least one of the QAM signals includes a time domain pilot reference.
  • a pilot interpolation filter (614) then processes this recovered pilot sequence to obtain an estimate of the channel gain at the intervening data symbol instants. Compensation of channel phase and amplitude distortion and recovery of the original data symbols are carried out as follows.
  • Delay (616) provided in the second processing path (610) serves to time-align the estimated channel gains with the corresponding data symbols.
  • the delayed data symbols are multiplied (617) by the complex conjugates (618) of the estimated channel gains. This operation corrects for channel phase but results in the symbol being scaled by the square of the channel amplitude. This is taken into account in the decision block (619) with appropriate input from a threshold adjustment multiplier (621 ) that itself utilizes nominal threshold information and a squared representation of the complex channel gain estimate (622).

Abstract

Méthodologie d'émission et de réception quadruple à 16 points de modulation d'amplitude en quadrature (QAM) dans laquelle une référence pilote de domaine temporel est incorporée utilement. Il peut y avoir une ou plusieurs de ces références pilotes (402) pour chaque paquet d'impulsions de 16 QAM multiples. Selon le mode de réalisation choisi, chaque impulsion de 16 QAM peut comporter une référence pilote de domaine temporel, ou une référence pilote évaluée pour cette impulsion peut être déterminée soit par rapport aux références pilotes comprises dans d'autres impulsions partageant le même paquet, soit par rapport aux références pilotes pour d'autres impulsions de 16 QAM reçues préalablement et correspondant à la même impulsion.
EP19910911570 1990-06-12 1991-05-17 Communication signal having a time domain pilot component Withdrawn EP0486667A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53682590A 1990-06-12 1990-06-12
US536825 1990-06-12

Publications (2)

Publication Number Publication Date
EP0486667A1 true EP0486667A1 (fr) 1992-05-27
EP0486667A4 EP0486667A4 (en) 1993-08-11

Family

ID=24140086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910911570 Withdrawn EP0486667A4 (en) 1990-06-12 1991-05-17 Communication signal having a time domain pilot component

Country Status (8)

Country Link
EP (1) EP0486667A4 (fr)
JP (1) JPH05501189A (fr)
KR (1) KR0137129B1 (fr)
CN (1) CN1059240A (fr)
AU (1) AU7951491A (fr)
BR (1) BR9105788A (fr)
CA (1) CA2064758C (fr)
WO (1) WO1991020137A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519730A (en) * 1990-06-12 1996-05-21 Jasper; Steven C. Communication signal having a time domain pilot component
USRE42643E1 (en) 1991-03-27 2011-08-23 Panasonic Corporation Communication system
JP2904986B2 (ja) * 1992-01-31 1999-06-14 日本放送協会 直交周波数分割多重ディジタル信号送信装置および受信装置
US5819000A (en) * 1992-03-26 1998-10-06 Matsushita Electric Industrial Co., Ltd. Magnetic recording and playback apparatus
US5802241A (en) 1992-03-26 1998-09-01 Matsushita Electric Industrial Co., Ltd. Communication system
US6728467B2 (en) 1992-03-26 2004-04-27 Matsushita Electric Industrial Co., Ltd. Communication system
US6724976B2 (en) 1992-03-26 2004-04-20 Matsushita Electric Industrial Co., Ltd. Communication system
USRE38513E1 (en) 1992-03-26 2004-05-11 Matsushita Electric Industrial Co., Ltd. Communication system
GB2271693A (en) * 1992-10-13 1994-04-20 Motorola Israel Ltd Communications system having pilot signals transmitted over frequency divided channels
US5666378A (en) * 1994-03-18 1997-09-09 Glenayre Electronics, Inc. High performance modem using pilot symbols for equalization and frame synchronization
GB9700947D0 (en) * 1997-01-17 1997-03-05 Digi Media Vision Ltd Method and apparatus for receiving frequency division multiplex signals
US6925067B2 (en) * 1999-04-23 2005-08-02 Qualcomm, Incorporated Configuration of overhead channels in a mixed bandwidth system
US6721267B2 (en) * 2000-08-01 2004-04-13 Motorola, Inc. Time and bandwidth scalable slot format for mobile data system
WO2002026018A2 (fr) * 2000-09-25 2002-04-04 Centillium Communications, Inc. Techniques de signalisation robustes dans des systemes a ondes porteuses multiples
WO2009018980A2 (fr) * 2007-08-03 2009-02-12 Oliver Bartels Appareil radio doté d'un nouveau procédé de modulation cifdm
US9893927B2 (en) * 2010-04-08 2018-02-13 Cometch EF Data Corp. Embedded meta-carrier with spread spectrum via overlaid carriers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0441731A1 (fr) * 1990-02-06 1991-08-14 ETAT FRANCAIS représenté par le Ministre des P.T.T. (Centre National d'Etudes des Télécommunications-CNET) Procédé de diffusion de données à entrelacement temps-fréquence et démodulation cohérente

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1217233A (fr) * 1982-12-29 1987-01-27 Susumu Sasaki Systeme de radiocommunication am avec tension de polarisation continue dans un canal
US4881245A (en) * 1983-07-01 1989-11-14 Harris Corporation Improved signalling method and apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0441731A1 (fr) * 1990-02-06 1991-08-14 ETAT FRANCAIS représenté par le Ministre des P.T.T. (Centre National d'Etudes des Télécommunications-CNET) Procédé de diffusion de données à entrelacement temps-fréquence et démodulation cohérente

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9120137A1 *

Also Published As

Publication number Publication date
CA2064758C (fr) 1996-11-12
CA2064758A1 (fr) 1991-12-13
EP0486667A4 (en) 1993-08-11
WO1991020137A1 (fr) 1991-12-26
BR9105788A (pt) 1992-08-04
JPH05501189A (ja) 1993-03-04
AU7951491A (en) 1992-01-07
KR920702579A (ko) 1992-09-04
KR0137129B1 (ko) 1998-06-01
CN1059240A (zh) 1992-03-04

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