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1. WO1997027695 - DIGITAL RECEIVER WITH FRACTIONALLY-SPACED SELF-RECOVERY ADAPTIVE EQUALIZER

Publication Number WO/1997/027695
Publication Date 31.07.1997
International Application No. PCT/US1997/000874
International Filing Date 22.01.1997
Chapter 2 Demand Filed 28.07.1997
IPC
H04L 7/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
7Arrangements for synchronising receiver with transmitter
02Speed or phase control by the received code signals, the signals containing no special synchronisation information
H04L 25/03 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
H04L 25/06 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
06Dc level restoring means; Bias distortion correction
H04L 27/38 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18, or H04L27/26213
34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
38Demodulator circuits; Receiver circuits
CPC
H04L 2025/0342
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
0335characterised by the type of transmission
03375Passband transmission
0342QAM
H04L 2025/0349
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03433characterised by equaliser structure
03439Fixed structures
03445Time domain
03471Tapped delay lines
03484time-recursive
0349as a feedback filter
H04L 2025/03509
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03433characterised by equaliser structure
03439Fixed structures
03445Time domain
03471Tapped delay lines
03509fractionally spaced
H04L 2025/03617
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03592Adaptation methods
03598Algorithms
03611Iterative algorithms
03617Time recursive algorithms
H04L 2025/03681
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03592Adaptation methods
03598Algorithms
03681Control of adaptation
H04L 25/03044
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03012operating in the time domain
03019adaptive, i.e. capable of adjustment during data reception
03038with a non-recursive structure
03044using fractionally spaced delay lines or combinations of fractionally integrally spaced taps
Applicants
  • TIERNAN COMMUNICATIONS, INCORPORATED [US]/[US]
Inventors
  • D'OREYE DE LANTREMANGE, Maximilien
Agents
  • SMITH, James, M.
Priority Data
60/011,13123.01.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIGITAL RECEIVER WITH FRACTIONALLY-SPACED SELF-RECOVERY ADAPTIVE EQUALIZER
(FR) RECEPTEUR NUMERIQUE A FRACTIONNEMENT SPATIAL, A AUTORETABLISSEMENT ET A COMPENSATION ADAPTATIVE
Abstract
(EN)
A fractionally-spaced adaptively-equalized self-recovering digital receiver includes a fractionally-spaced adaptive filter for equalizing channel distortion which includes means for adaptively adjusting the coefficients of the fractionally-spaced filter with a self-recovering (blind) algorithm or a decision directed algorithm; means for changing the timing at which the data is sampled; means for estimating the sampling frequency offset in order to derive the optimal timing; means for synchronizing the signal resampling at the symbol rate using the statistics of the received data samples; means for evaluating the profile of the equalizer coefficients; and means for tracking carrier frequency offset.
(FR)
L'invention porte sur un récepteur numérique à fractionnement spatial, à autorétablissement et à compensation adaptative comportant un filtre adaptatif à fractionnement spatial pour compenser les distorsions des canaux qui comprend lui-même des moyens d'ajustement adaptatif de ses coefficients recourant à un algorithme autorétablissant (aveugle) ou à un algorithme décisionnel. L'invention porte en outre sur un moyen de modification du rythme de l'échantillonnage; sur un moyen d'estimation du décalage de la fréquence d'échantillonnage pour en dériver le rythme optimal; sur un moyen de synchronisation du rééchantillonnage de signaux avec le taux des symboles à l'aide des statistiques relatives aux échantillons de données prélevés; sur un moyen d'évaluation du profil des coefficients de compensation; et sur des moyens de poursuite les décalages de la fréquence de la porteuse.
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