Messaoud Ahmed ouameur - Academia.edu (original) (raw)

Papers by Messaoud Ahmed ouameur

Research paper thumbnail of Carrier frequency and sampling rate offsets effect on sub 6 GHz Massive MIMO

2015 Nordic Circuits and Systems Conference (NORCAS): NORCHIP & International Symposium on System-on-Chip (SoC), 2015

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Research paper thumbnail of Energy efficient power allocation and relay location for asymmetric bi-directional relaying

2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2015

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Research paper thumbnail of Modélisation et estimation de canaux pour les communications sans fil

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Research paper thumbnail of Méthodes d'estimation de canal et de détection itérative pour les communications CDMA

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Research paper thumbnail of A Markov chain and quadrature amplitude modulation fading based statistical discrete time model for multi-WSSUS multipath channel

Canadian Conference on Electrical and Computer Engineering 2001. Conference Proceedings (Cat. No.01TH8555), 2001

ABSTRACT The computation of the tap-gains of the discrete time representation of slowly time-vary... more ABSTRACT The computation of the tap-gains of the discrete time representation of slowly time-varying multipath channel is investigated. The simplest nondegenerate class of processes which exhibits uncorrelated depressiveness in the time delay and Doppler shifts is known ...

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Research paper thumbnail of A low complexity turbo detection for coded DS-CDMA systems in multipath channels at rake computational load

IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004., 2004

ABSTRACT

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Research paper thumbnail of Reduced Complexity Turbo Detection for Coded DS-CDMA Systems Employing BPSK Modulations

Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005., 2005

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Research paper thumbnail of Analysis of turbo decoders for UMTS systems

CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH37436), 2003

This article introduces channel coding in the 3G mobile communication system. The study relates i... more This article introduces channel coding in the 3G mobile communication system. The study relates initially to the conventional coding and is followed by a study on turbo code. A comparative study is carried out between convolutional coding and turbo coding and between different iterative coding algorithms (turbo coding). The study puts in evidence the contribution of the soft decoding methods (soft decision decoding) compared to the hard methods of decoding (hard decision coding), in the occurrence of the Viterbi algorithm. The AWGN channel (12 kbps) and the standard 3GPP (64 kbps) are thus utilised for the conventional and turbo coding respectively.

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Research paper thumbnail of A WCDMA multipath searcher based on a Wave Pipeline method

2007 IEEE Northeast Workshop on Circuits and Systems, 2007

Abstract In this paper, we present the wave pipeline implementation of a multiplier-accumulator t... more Abstract In this paper, we present the wave pipeline implementation of a multiplier-accumulator that processes complex numbers for high-speed signal processing in the third generation cellular systems. Since the multiplier-accumulator is one of the most ...

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Research paper thumbnail of Multiple Antennas and Multipass Structure for Adaptive Duplicated Filters and Interference Canceller in WCDMA Systems

2008 4th IEEE International Conference on Circuits and Systems for Communications, 2008

Abstract— An adaptive multistage multiuser detection (MUD) method namely adaptive duplicated filt... more Abstract— An adaptive multistage multiuser detection (MUD) method namely adaptive duplicated filters and interference canceller (ADIC1), has been proposed in a uplink WCDMA context. It was shown that ADIC approach provides, in a single receive antenna scenario, the same ...

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Research paper thumbnail of Schroeder sequences for time dispersive frequency selective channel estimation using DFT and Least Sum of Squared Errors methods

IEEE International Conference on Acoustics Speech and Signal Processing, 2002

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Research paper thumbnail of FPGA Implementation of Beamforming Receivers Based on MRC and NC-LMS for DS-CDMA System

IEEE 17th International Conference on Application-specific Systems, Architectures and Processors (ASAP'06), 2006

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Research paper thumbnail of A Real-Time DSP-based Iterative (Turbo) Multiuser Detection Employing Interference Cancellor-MMSE

2006 IEEE North-East Workshop on Circuits and Systems, 2006

In this paper, we investigate the implementation of an efficient low complexity iterative detecto... more In this paper, we investigate the implementation of an efficient low complexity iterative detector (namely IC-MMSE), for coded direct sequence code division multiple access (DS-CDMA) system, under fixed-point data representation and computation constraint. TMS320C6416 TI's fixed point DSP, part of the C6416 DSK platrform, is utilized. Real time simulations are made possible by using real time data exchange (RTDX) technology. For performance evaluation extrinsic information transfer (EXIT) chart analysis is used. EXIT charts reveal that fixed point implementation is feasible at possibly no performance degradation. Based on the measured number of cycles of different constituent sub-functions of the IC-MMSE receiver, a data transmission rate of up to 186 Kb/s can be reached for a 5-users load and processing gain of 7 in an AWGN channel

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Research paper thumbnail of Wiener LMS Based Multipath Channel Estimation in WCDMA and cdma2000

IEEE Vehicular Technology Conference, 2006

This work is devoted to the problem of asynchronous multiuser delay acquisition and time varying ... more This work is devoted to the problem of asynchronous multiuser delay acquisition and time varying channel tracking in DS-CDMA systems. A multiuser-LMS-like structure along with smoothing/prediction filters to improve tracking quality is suggested. A performance versus complexity analysis is conducted, in cdma2000 and WCDMA environments, over highly interesting settings including different data rates, channel types and mobile speeds. It has

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Research paper thumbnail of MEMS based tunable microwave amplifier design for reconfigurable PCS1900 mobile application

2011 11th Mediterranean Microwave Symposium (MMS), 2011

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Research paper thumbnail of On MSE Exit Chart Analysis and Real Time DSP Implementation for Iterative (Turbo) Detection

Journal of Signal Processing Systems, 2011

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Research paper thumbnail of Nonlinear Equalization Structure for High-Speed ADSL in Ideal and Non Ideal Conditions

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Research paper thumbnail of SNR and Channel Mismatch Effect on Iterative (Turbo) Detection Performance from EXIT Chart Analysis

... Detection Performance from EXIT Chart Analysis Messaoud AHMED-OUAMEUR and Daniel MASSICOTTE D... more ... Detection Performance from EXIT Chart Analysis Messaoud AHMED-OUAMEUR and Daniel MASSICOTTE Department of Electrical and Computer Engineering, Universite du Quebec a Trois-Rivieres CP 500, Trois-Rivieres, Quebec, Canada, G9A 5H7 Tel. ...

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Research paper thumbnail of FPGA implementation for channel estimations based on Wiener LMS for DS-CDMA

The estimation of channel delays along with their respective complex channel coefficients of diff... more The estimation of channel delays along with their respective complex channel coefficients of different users constitutes the first stage in the detection process at the receiving base station in a DS-CDMA communication system. A multiuser steepest Wiener LMS (MS-WLMS) like structure algorithm along with smoothing/prediction filters to improve tracking quality is suggested. This paper presents a customized and fixed-point hardware parallel implementation of the proposed algorithm for WCDMA uplink transmission in third generation (3G) wireless system. Additional speedup in the execution time is achieved over the well known maximum likelihood channel estimation for DS-CDMA. It is also shown that our solution could achieve the real-time requirements of 3GPP standards applied in WCDMA systems.

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Research paper thumbnail of Adaptive Duplicated Filters and Interference Canceller for DS-CDMA Systems: Part I - Algorithm

A multistage multiuser detection (MUD) technique, the adaptive duplicated filters plus interferen... more A multistage multiuser detection (MUD) technique, the adaptive duplicated filters plus interference canceller (ADIC), is proposed in the DS-CDMA context. Of particular interest is the use of adaptive filters block (AFB) dedicated to each user with its respective input signals independent from other users' contributions. These AFB are mixed with interference canceller block in a cascade arrangement. As shown in this paper, this proposed MUD can outperform the decision feedback soft multistage interference canceller (DF-Soft-MPIC) MUD with complexity reduction of 4. Algorithmic description and performance of low complexity MUD method are considered in this paper and FPGA implementation in a companion paper, Part II.

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Research paper thumbnail of Carrier frequency and sampling rate offsets effect on sub 6 GHz Massive MIMO

2015 Nordic Circuits and Systems Conference (NORCAS): NORCHIP & International Symposium on System-on-Chip (SoC), 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Energy efficient power allocation and relay location for asymmetric bi-directional relaying

2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2015

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Research paper thumbnail of Modélisation et estimation de canaux pour les communications sans fil

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Méthodes d'estimation de canal et de détection itérative pour les communications CDMA

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Markov chain and quadrature amplitude modulation fading based statistical discrete time model for multi-WSSUS multipath channel

Canadian Conference on Electrical and Computer Engineering 2001. Conference Proceedings (Cat. No.01TH8555), 2001

ABSTRACT The computation of the tap-gains of the discrete time representation of slowly time-vary... more ABSTRACT The computation of the tap-gains of the discrete time representation of slowly time-varying multipath channel is investigated. The simplest nondegenerate class of processes which exhibits uncorrelated depressiveness in the time delay and Doppler shifts is known ...

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Research paper thumbnail of A low complexity turbo detection for coded DS-CDMA systems in multipath channels at rake computational load

IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004., 2004

ABSTRACT

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Research paper thumbnail of Reduced Complexity Turbo Detection for Coded DS-CDMA Systems Employing BPSK Modulations

Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005., 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of turbo decoders for UMTS systems

CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH37436), 2003

This article introduces channel coding in the 3G mobile communication system. The study relates i... more This article introduces channel coding in the 3G mobile communication system. The study relates initially to the conventional coding and is followed by a study on turbo code. A comparative study is carried out between convolutional coding and turbo coding and between different iterative coding algorithms (turbo coding). The study puts in evidence the contribution of the soft decoding methods (soft decision decoding) compared to the hard methods of decoding (hard decision coding), in the occurrence of the Viterbi algorithm. The AWGN channel (12 kbps) and the standard 3GPP (64 kbps) are thus utilised for the conventional and turbo coding respectively.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A WCDMA multipath searcher based on a Wave Pipeline method

2007 IEEE Northeast Workshop on Circuits and Systems, 2007

Abstract In this paper, we present the wave pipeline implementation of a multiplier-accumulator t... more Abstract In this paper, we present the wave pipeline implementation of a multiplier-accumulator that processes complex numbers for high-speed signal processing in the third generation cellular systems. Since the multiplier-accumulator is one of the most ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Multiple Antennas and Multipass Structure for Adaptive Duplicated Filters and Interference Canceller in WCDMA Systems

2008 4th IEEE International Conference on Circuits and Systems for Communications, 2008

Abstract— An adaptive multistage multiuser detection (MUD) method namely adaptive duplicated filt... more Abstract— An adaptive multistage multiuser detection (MUD) method namely adaptive duplicated filters and interference canceller (ADIC1), has been proposed in a uplink WCDMA context. It was shown that ADIC approach provides, in a single receive antenna scenario, the same ...

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Research paper thumbnail of Schroeder sequences for time dispersive frequency selective channel estimation using DFT and Least Sum of Squared Errors methods

IEEE International Conference on Acoustics Speech and Signal Processing, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of FPGA Implementation of Beamforming Receivers Based on MRC and NC-LMS for DS-CDMA System

IEEE 17th International Conference on Application-specific Systems, Architectures and Processors (ASAP'06), 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Real-Time DSP-based Iterative (Turbo) Multiuser Detection Employing Interference Cancellor-MMSE

2006 IEEE North-East Workshop on Circuits and Systems, 2006

In this paper, we investigate the implementation of an efficient low complexity iterative detecto... more In this paper, we investigate the implementation of an efficient low complexity iterative detector (namely IC-MMSE), for coded direct sequence code division multiple access (DS-CDMA) system, under fixed-point data representation and computation constraint. TMS320C6416 TI's fixed point DSP, part of the C6416 DSK platrform, is utilized. Real time simulations are made possible by using real time data exchange (RTDX) technology. For performance evaluation extrinsic information transfer (EXIT) chart analysis is used. EXIT charts reveal that fixed point implementation is feasible at possibly no performance degradation. Based on the measured number of cycles of different constituent sub-functions of the IC-MMSE receiver, a data transmission rate of up to 186 Kb/s can be reached for a 5-users load and processing gain of 7 in an AWGN channel

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Wiener LMS Based Multipath Channel Estimation in WCDMA and cdma2000

IEEE Vehicular Technology Conference, 2006

This work is devoted to the problem of asynchronous multiuser delay acquisition and time varying ... more This work is devoted to the problem of asynchronous multiuser delay acquisition and time varying channel tracking in DS-CDMA systems. A multiuser-LMS-like structure along with smoothing/prediction filters to improve tracking quality is suggested. A performance versus complexity analysis is conducted, in cdma2000 and WCDMA environments, over highly interesting settings including different data rates, channel types and mobile speeds. It has

Bookmarks Related papers MentionsView impact

Research paper thumbnail of MEMS based tunable microwave amplifier design for reconfigurable PCS1900 mobile application

2011 11th Mediterranean Microwave Symposium (MMS), 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On MSE Exit Chart Analysis and Real Time DSP Implementation for Iterative (Turbo) Detection

Journal of Signal Processing Systems, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nonlinear Equalization Structure for High-Speed ADSL in Ideal and Non Ideal Conditions

Bookmarks Related papers MentionsView impact

Research paper thumbnail of SNR and Channel Mismatch Effect on Iterative (Turbo) Detection Performance from EXIT Chart Analysis

... Detection Performance from EXIT Chart Analysis Messaoud AHMED-OUAMEUR and Daniel MASSICOTTE D... more ... Detection Performance from EXIT Chart Analysis Messaoud AHMED-OUAMEUR and Daniel MASSICOTTE Department of Electrical and Computer Engineering, Universite du Quebec a Trois-Rivieres CP 500, Trois-Rivieres, Quebec, Canada, G9A 5H7 Tel. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of FPGA implementation for channel estimations based on Wiener LMS for DS-CDMA

The estimation of channel delays along with their respective complex channel coefficients of diff... more The estimation of channel delays along with their respective complex channel coefficients of different users constitutes the first stage in the detection process at the receiving base station in a DS-CDMA communication system. A multiuser steepest Wiener LMS (MS-WLMS) like structure algorithm along with smoothing/prediction filters to improve tracking quality is suggested. This paper presents a customized and fixed-point hardware parallel implementation of the proposed algorithm for WCDMA uplink transmission in third generation (3G) wireless system. Additional speedup in the execution time is achieved over the well known maximum likelihood channel estimation for DS-CDMA. It is also shown that our solution could achieve the real-time requirements of 3GPP standards applied in WCDMA systems.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adaptive Duplicated Filters and Interference Canceller for DS-CDMA Systems: Part I - Algorithm

A multistage multiuser detection (MUD) technique, the adaptive duplicated filters plus interferen... more A multistage multiuser detection (MUD) technique, the adaptive duplicated filters plus interference canceller (ADIC), is proposed in the DS-CDMA context. Of particular interest is the use of adaptive filters block (AFB) dedicated to each user with its respective input signals independent from other users' contributions. These AFB are mixed with interference canceller block in a cascade arrangement. As shown in this paper, this proposed MUD can outperform the decision feedback soft multistage interference canceller (DF-Soft-MPIC) MUD with complexity reduction of 4. Algorithmic description and performance of low complexity MUD method are considered in this paper and FPGA implementation in a companion paper, Part II.

Bookmarks Related papers MentionsView impact