thierry pollet
KU Leuven, Flanders Business School, Faculty Member
Werkwijze en inrichting voor het over een ruisrijk medium binnen een voorafbepaalde frequentieband, overdragen van data, waarbij een datasignaal met een breedbandig spectrum gevormd wordt door een pseudo-ruis code met de over te dragen... more
Werkwijze en inrichting voor het over een ruisrijk medium binnen een voorafbepaalde frequentieband, overdragen van data, waarbij een datasignaal met een breedbandig spectrum gevormd wordt door een pseudo-ruis code met de over te dragen data te mengen en waarbij het ontavangen datasignaal aan een korrelatie operatie met de pseudo-ruis code wordt onderworpen ter extractie van de data. Het datasignaal wordt gemoduleerd op een draaggolf met een frequentie fo gekozen binnen genoemde freuqentieband en waarbij een chipfrequentie fc gebruikt wordt dieeen nagenoeg gehele franktie (M) bedraagt (2fo = fc.M) van het dubbele van de draaggolffrequentie.
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... Record Details. Record ID, 246252. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. Title, A Low Cost Spread Spectrum... more
... Record Details. Record ID, 246252. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. Title, A Low Cost Spread Spectrum Transceiver for Mains Signalling. ...
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... Please use this identifier to cite or link to this item: Record Details. Record ID, 246254. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University... more
... Please use this identifier to cite or link to this item: Record Details. Record ID, 246254. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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... Record Details. Record ID, 237609. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Van Bladel [801000818089] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University... more
... Record Details. Record ID, 237609. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Van Bladel [801000818089] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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... Please use this identifier to cite or link to this item: Record Details. Record ID, 264317. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University... more
... Please use this identifier to cite or link to this item: Record Details. Record ID, 264317. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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Abstract We determine the maximum bit rate that can be achieved by a multitone transceiver for either unidirectional or bidirectional data transmission on a single twisted pair cable of 50 m, which is used to connect the subscriber to an... more
Abstract We determine the maximum bit rate that can be achieved by a multitone transceiver for either unidirectional or bidirectional data transmission on a single twisted pair cable of 50 m, which is used to connect the subscriber to an optical network unit at the pedestal. We ...
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High speed digital subscriber line (DSL) systems transmit signals that overlap in spectrum with the bands used for radio communications. AM broadcast stations and radio amateur transmitters result into electromagnetic interference... more
High speed digital subscriber line (DSL) systems transmit signals that overlap in spectrum with the bands used for radio communications. AM broadcast stations and radio amateur transmitters result into electromagnetic interference impairing the DSL-receiver. For discrete multitone systems, windowing, in combination with radio frequency interference (RFI) cancellation has been proposed to make DSL-transceivers robust to radio ingress. This paper shows how windowing has an equivalent implementation by means of the so-called per tone equalization
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A method for estimating attributes of a transmission line (LP), said method comprising the steps of: making measurements reflectometry said transmission line, determining from said measurements reflectometry parameter dispersion 1 port of... more
A method for estimating attributes of a transmission line (LP), said method comprising the steps of: making measurements reflectometry said transmission line, determining from said measurements reflectometry parameter dispersion 1 port of said line transmission is a base reference impedance (Zref), estimating a characteristic impedance (Z0) of said transmission line, wherein said method further comprises the steps of: converting said dispersion parameter of one port from said base impedance reference to a base of characteristic impedance estimated, thereby producing a second parameter scattering port 1 with reflections from the proximal end waste, determining a time zone wherein said reflections of the proximal end residuals are locked, neutralizing the contribution of said time zone in the process of estimating said attributes s of said transmission line.
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... Record Details. Record ID, 246242. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Hendrik Van De Velde [801000867401] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University... more
... Record Details. Record ID, 246242. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Hendrik Van De Velde [801000867401] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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... Record Details. Record ID, 246248. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. Title, Symbol timing and carrier... more
... Record Details. Record ID, 246248. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. Title, Symbol timing and carrier synchronization in OFDM systems. ...
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Different combinations of echo cancellation (implemented partly in the frequency domain and partly in the time domain, see [1], [2]) and equalization are considered for DMT-based ADSL modems. Computational complexity is compared for... more
Different combinations of echo cancellation (implemented partly in the frequency domain and partly in the time domain, see [1], [2]) and equalization are considered for DMT-based ADSL modems. Computational complexity is compared for schemes applying first equalization and then echo cancellation or vice versa. It is demonstrated how time/frequency domain echo cancellation can be combined with so-called per tone equalization, leading to optimal capacity, generally not achievable with time domain equalization.
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Abstract—A preprocessing algorithm is proposed to visualize the time-domain one-port scattering parameter of a subscriber line measured at the Central Office. To overcome the high line attenuation and the mismatch between the line and the... more
Abstract—A preprocessing algorithm is proposed to visualize the time-domain one-port scattering parameter of a subscriber line measured at the Central Office. To overcome the high line attenuation and the mismatch between the line and the measurement instrument, a preprocessing algorithm is developed to obtain numerically the impulse response of the one-port scattering parameter. The algorithm will search for a quasi-optimal base impedance for the scattering parameter; then, it will de-noise and de-alias the impulse response and will provide an estimate for the first meaningful significant reflection. Index Terms—Impulse response, scattering parameter, time alias, time-domain reflectometry (TDR), transmission lines. I.
An alternative receiver structure is presented for discrete multitone (DMT)-based systems. The usual structure consisting of a (real) time domain equalizer (TEQ) with a (complex) 1-taps frequency domain equalizer (FEQ) per tone, is... more
An alternative receiver structure is presented for discrete multitone (DMT)-based systems. The usual structure consisting of a (real) time domain equalizer (TEQ) with a (complex) 1-taps frequency domain equalizer (FEQ) per tone, is modified into a structure with a (complex) multitaps FEQ per tone. By solving an MMSE problem, the SNR is maximized for each individual tone. This always results in a larger bitrate while complexity during data transmission is kept at the same level. Moreover, the per tone equalization is shown to have a reduced sensitivity to the synchronization delay.
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The IEEE 754 Floating point standard [1] specifies a simple (32 bits) and double precision (64 bits). For the FFT block in a DSL modem (DMT based), even 32 bits proves to be too much, and a custom number of bits can be used. This in turn... more
The IEEE 754 Floating point standard [1] specifies a simple (32 bits) and double precision (64 bits). For the FFT block in a DSL modem (DMT based), even 32 bits proves to be too much, and a custom number of bits can be used. This in turn will lead to savings in area and power on the ASIC implementation. Several techniques were considered for reducing the number of bits.
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... Please use this identifier to cite or link to this item: Record Details. Record ID, 246232. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; C COLLE; Marc Moeneclaey [801000521231] - Ghent University... more
... Please use this identifier to cite or link to this item: Record Details. Record ID, 246232. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; C COLLE; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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... Please use this identifier to cite or link to this item: Record Details. Record ID, 246250. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University... more
... Please use this identifier to cite or link to this item: Record Details. Record ID, 246250. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
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The lift-off of DSL (digital subscriber line) has urged the subscriber line testing equipment manufacturers to extend their narrowband POTS (plain old telephony service) testheads towards DSL. The local loop, which connects the customer... more
The lift-off of DSL (digital subscriber line) has urged the subscriber line testing equipment manufacturers to extend their narrowband POTS (plain old telephony service) testheads towards DSL. The local loop, which connects the customer premises (CP) to the central office (CO) and which has been designed for POTS voice-band transmission, may have numerous impairments with respect to DSL. Some impairments, such as load coils, have to be detected, located, and removed. Others, such as bridged taps, don't have to be removed, but can seriously impact the maximum achievable loop bit rate. The dream of every telecom operator is a testhead that can accurately estimate the loop channel capacity expressed in bit/s by means of single-ended measurements only. In this paper we will give an overview of local loop impairments and subscriber line testing methods, focussing on metallic line testing and especially time-domain reflectometry (TDR). The authors have developed a reflectometric loop ...
Abstract: Three different transport modes have been specified and standardized for use in various Digital Subscriber Line (xDSL) systems: Asynchronous Transfer Mode (ATM), Synchronous Transfer Mode (STM) and more recently Packet Transfer... more
Abstract: Three different transport modes have been specified and standardized for use in various Digital Subscriber Line (xDSL) systems: Asynchronous Transfer Mode (ATM), Synchronous Transfer Mode (STM) and more recently Packet Transfer Mode (PTM). ...
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Research Interests: Complexity, Convergence, Algorithm, Multidisciplinary, Adaptive Filtering, and 15 moreEqualization, Noise, Lead, Convergence Rate, Adaptive Filter, Real Time, Adaptive Filters, Least Mean Square, ADSL, Digital Subscriber Lines, Recursive Least Square, Equalizer, Frequency Domain, Least squares method, and OFDM modulation
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Research Interests:
The IEEE 754 Floating point standard (1) specifies a simple (32 bits) and double precision (64 bits). For the FFT block in a DSL modem (DMT based), even 32 bits proves to be too much, and a custom number of bits can be used. This in turn... more
The IEEE 754 Floating point standard (1) specifies a simple (32 bits) and double precision (64 bits). For the FFT block in a DSL modem (DMT based), even 32 bits proves to be too much, and a custom number of bits can be used. This in turn will lead to savings in area and power on the ASIC implementation. Several
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... Record ID, 273446. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Heidi Steendam [801001014820] - Ghent University Heidi.Steendam@UGent.be; Marc Moeneclaey [801000521231] - Ghent University... more
... Record ID, 273446. Record Type, conference. Author, Thierry Pollet [801000731395] - Ghent University; Heidi Steendam [801001014820] - Ghent University Heidi.Steendam@UGent.be; Marc Moeneclaey [801000521231] - Ghent University Marc.Moeneclaey@UGent.be. ...
An improved optimization algorithm for the time domain equalizer (TEQ) is developed for discrete multitone (DMT) based asymmetric digital subscriber line (ADSL). In contrast with existing algorithms, our algorithm explicitly disregards... more
An improved optimization algorithm for the time domain equalizer (TEQ) is developed for discrete multitone (DMT) based asymmetric digital subscriber line (ADSL). In contrast with existing algorithms, our algorithm explicitly disregards the unused tones in the cost function as well as in the non-triviality constraint. Simulation results are presented for the upstream channel. It is shown that the achievable bitrate