Abdelaziz Samet | Université de Carthage (original) (raw)
Papers by Abdelaziz Samet
Progress in Electromagnetics Research Letters, 2009
2015 23rd European Signal Processing Conference (EUSIPCO), 2015
IET Signal Processing, 2015
Wireless Personal Communications, 2015
Progress In Electromagnetics Research M, 2009
2008 IEEE Wireless Communications and Networking Conference, 2008
This paper focuses on the problem of angular spread (AS) estimation at the base station in a macr... more This paper focuses on the problem of angular spread (AS) estimation at the base station in a macro-cellular system when a line-of-sight (LOS) component is potentially present. We will limit our study to low-complexity methods prone to practical implementation. The paper demonstrates the limitations of the well-known low complexity AS estimation method, spread root-MUSIC. As supported by simulations, it introduces
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2010
Closed-form CRLBs are derived for estimates of the Ricean K-factor from I/Q data. Indeed, the CRL... more Closed-form CRLBs are derived for estimates of the Ricean K-factor from I/Q data. Indeed, the CRLBs evaluate effectively the estimators and indicate the best approach to adopt. The CRLBs are derived in two cases. In the first case, only the Ricean K-factor is assumed unknown, while in the second case the Line-Of-Sight (LOS) phase, Angle of Arrival (AoA), Doppler shift
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
ABSTRACT In this paper, an analytical expression of the Cramér-Rao Lower Bound (CRLB) for envelop... more ABSTRACT In this paper, an analytical expression of the Cramér-Rao Lower Bound (CRLB) for envelope-based unbiased estimators of the Ricean K-factor is derived. The received signal is modeled by the sum of a Line-Of-Sight (LOS) component and a scattered component. Our new closed-form expression allows the immediate evaluation of the CRLB and corroborates previous works, which are numerically computed from very complex expressions. We also compare the performance of a moment-based estimator with the developed analytical CRLB. Simulation results show that the first and second-order moments-based estimator performance is close to the CRLB while the second and fourth-order moments estimator shows higher estimation error.
2009 Mediterrannean Microwave Symposium (MMS), 2009
ABSTRACT In this paper, the effects of a metal plate to antenna parameters (input impedance, retu... more ABSTRACT In this paper, the effects of a metal plate to antenna parameters (input impedance, return loss and radiation patterns) is presented when the RFID tag antenna is horizontally placed near the metal plate. The metal plate has finite size and rectangular shape. The new technique based on the moment method and RWG basis functions developed by Ghannay et al. has been used to simulate the dependency of antenna parameters on the size of the plate and the distance between the antenna and the plate.
2009 Mediterrannean Microwave Symposium (MMS), 2009
ABSTRACT Planar guiding structures are analyzed using a mixed-potential integral-equation formula... more ABSTRACT Planar guiding structures are analyzed using a mixed-potential integral-equation formulation (MPIE) solved by the method of moments (MoM). Closed-form two-dimensional Green's functions for the scalar and vector potentials are analytically obtained in the space domain due to the approximation of its spectral-domain version with discrete complex images method (DCIM), thus avoiding lengthy numerical evaluations. It will be shown that a suitable choice of the sampling path is key to reducing the number of images and to avoiding the necessity of extracting spectral poles. The advantages of this approach will be illustrated by numerical results.
2005 12th IEEE International Conference on Electronics, Circuits and Systems, 2005
ABSTRACT The transistors with large gate width are not really used by microwave circuit, because ... more ABSTRACT The transistors with large gate width are not really used by microwave circuit, because of the propagation phenomena problems and thermal dissipation (thermal noise). But the usefully frequencies becomes increasingly high, so the current short transistors will be affected by the propagation phenomena. This large width transistor noise analysis is fault of measurements limits beyond 18 GHz.
2007 14th IEEE International Conference on Electronics, Circuits and Systems, 2007
A field-effect transistor constitutes a propagation structure along its gate width. Telegraphists... more A field-effect transistor constitutes a propagation structure along its gate width. Telegraphists equations are solved for this structure. One deduces from this the effect of the propagation on the transistor Z-parameters which can be taken into account in electric simulations and which may improve the use of long transistors at lower frequencies and of short transistors at higher frequencies [1]. New elements have been added to the equivalent circuit in order to take into account the propagation phenomena.
Progress In Electromagnetics Research Letters, 2009
2009 Mediterrannean Microwave Symposium (MMS), 2009
... Faouzi Romdhani UR-CSE group. ... radiation pattern, and polarization) are needed [1]. In man... more ... Faouzi Romdhani UR-CSE group. ... radiation pattern, and polarization) are needed [1]. In many cases, especially for mobile terminals, the most important feature is the capability of changing the operating frequency band [2]-[3]. This can be achieved either by using wide-band or ...
Eighth International Multi-Conference on Systems, Signals & Devices, 2011
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
Abstract In the IEEE 802.16 recommendations family, the adjacent method for construction of the s... more Abstract In the IEEE 802.16 recommendations family, the adjacent method for construction of the subchannel is adopted. In order to reduce the system complexity, the available subcarriers are grouped into equal groups of contiguous subcarriers, where each group is ...
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
Abstract In this paper we have proposed a new heuristic method for subchannels allocation problem... more Abstract In this paper we have proposed a new heuristic method for subchannels allocation problem in the context of WiMAX release 2.0, IEEE 802.16 m. In this system, OFDM transmission method has been used, in order to reduce the effect of multipath fading and ...
2008 Third International Conference on Systems and Networks Communications, 2008
... Supérieure, 1100, rue Notre-Dame O. Montréal (Qc) H3C 1K3 Canada 3 Ecole Polytechnique de T... more ... Supérieure, 1100, rue Notre-Dame O. Montréal (Qc) H3C 1K3 Canada 3 Ecole Polytechnique de Tunisie , BP 743 La Marsa, 2070 Tunis, Tunisia Email : abdelaziz.hamdi@polymtl.ca,ammar.kouki@etsmtl.ca ... 1999. [3] DR Smith, WJ Padilla, DC Vier, SC Nemat-Nasser, and S ...
Progress in Electromagnetics Research Letters, 2009
2015 23rd European Signal Processing Conference (EUSIPCO), 2015
IET Signal Processing, 2015
Wireless Personal Communications, 2015
Progress In Electromagnetics Research M, 2009
2008 IEEE Wireless Communications and Networking Conference, 2008
This paper focuses on the problem of angular spread (AS) estimation at the base station in a macr... more This paper focuses on the problem of angular spread (AS) estimation at the base station in a macro-cellular system when a line-of-sight (LOS) component is potentially present. We will limit our study to low-complexity methods prone to practical implementation. The paper demonstrates the limitations of the well-known low complexity AS estimation method, spread root-MUSIC. As supported by simulations, it introduces
2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2010
Closed-form CRLBs are derived for estimates of the Ricean K-factor from I/Q data. Indeed, the CRL... more Closed-form CRLBs are derived for estimates of the Ricean K-factor from I/Q data. Indeed, the CRLBs evaluate effectively the estimators and indicate the best approach to adopt. The CRLBs are derived in two cases. In the first case, only the Ricean K-factor is assumed unknown, while in the second case the Line-Of-Sight (LOS) phase, Angle of Arrival (AoA), Doppler shift
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
ABSTRACT In this paper, an analytical expression of the Cramér-Rao Lower Bound (CRLB) for envelop... more ABSTRACT In this paper, an analytical expression of the Cramér-Rao Lower Bound (CRLB) for envelope-based unbiased estimators of the Ricean K-factor is derived. The received signal is modeled by the sum of a Line-Of-Sight (LOS) component and a scattered component. Our new closed-form expression allows the immediate evaluation of the CRLB and corroborates previous works, which are numerically computed from very complex expressions. We also compare the performance of a moment-based estimator with the developed analytical CRLB. Simulation results show that the first and second-order moments-based estimator performance is close to the CRLB while the second and fourth-order moments estimator shows higher estimation error.
2009 Mediterrannean Microwave Symposium (MMS), 2009
ABSTRACT In this paper, the effects of a metal plate to antenna parameters (input impedance, retu... more ABSTRACT In this paper, the effects of a metal plate to antenna parameters (input impedance, return loss and radiation patterns) is presented when the RFID tag antenna is horizontally placed near the metal plate. The metal plate has finite size and rectangular shape. The new technique based on the moment method and RWG basis functions developed by Ghannay et al. has been used to simulate the dependency of antenna parameters on the size of the plate and the distance between the antenna and the plate.
2009 Mediterrannean Microwave Symposium (MMS), 2009
ABSTRACT Planar guiding structures are analyzed using a mixed-potential integral-equation formula... more ABSTRACT Planar guiding structures are analyzed using a mixed-potential integral-equation formulation (MPIE) solved by the method of moments (MoM). Closed-form two-dimensional Green's functions for the scalar and vector potentials are analytically obtained in the space domain due to the approximation of its spectral-domain version with discrete complex images method (DCIM), thus avoiding lengthy numerical evaluations. It will be shown that a suitable choice of the sampling path is key to reducing the number of images and to avoiding the necessity of extracting spectral poles. The advantages of this approach will be illustrated by numerical results.
2005 12th IEEE International Conference on Electronics, Circuits and Systems, 2005
ABSTRACT The transistors with large gate width are not really used by microwave circuit, because ... more ABSTRACT The transistors with large gate width are not really used by microwave circuit, because of the propagation phenomena problems and thermal dissipation (thermal noise). But the usefully frequencies becomes increasingly high, so the current short transistors will be affected by the propagation phenomena. This large width transistor noise analysis is fault of measurements limits beyond 18 GHz.
2007 14th IEEE International Conference on Electronics, Circuits and Systems, 2007
A field-effect transistor constitutes a propagation structure along its gate width. Telegraphists... more A field-effect transistor constitutes a propagation structure along its gate width. Telegraphists equations are solved for this structure. One deduces from this the effect of the propagation on the transistor Z-parameters which can be taken into account in electric simulations and which may improve the use of long transistors at lower frequencies and of short transistors at higher frequencies [1]. New elements have been added to the equivalent circuit in order to take into account the propagation phenomena.
Progress In Electromagnetics Research Letters, 2009
2009 Mediterrannean Microwave Symposium (MMS), 2009
... Faouzi Romdhani UR-CSE group. ... radiation pattern, and polarization) are needed [1]. In man... more ... Faouzi Romdhani UR-CSE group. ... radiation pattern, and polarization) are needed [1]. In many cases, especially for mobile terminals, the most important feature is the capability of changing the operating frequency band [2]-[3]. This can be achieved either by using wide-band or ...
Eighth International Multi-Conference on Systems, Signals & Devices, 2011
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
Abstract In the IEEE 802.16 recommendations family, the adjacent method for construction of the s... more Abstract In the IEEE 802.16 recommendations family, the adjacent method for construction of the subchannel is adopted. In order to reduce the system complexity, the available subcarriers are grouped into equal groups of contiguous subcarriers, where each group is ...
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
Abstract In this paper we have proposed a new heuristic method for subchannels allocation problem... more Abstract In this paper we have proposed a new heuristic method for subchannels allocation problem in the context of WiMAX release 2.0, IEEE 802.16 m. In this system, OFDM transmission method has been used, in order to reduce the effect of multipath fading and ...
2008 Third International Conference on Systems and Networks Communications, 2008
... Supérieure, 1100, rue Notre-Dame O. Montréal (Qc) H3C 1K3 Canada 3 Ecole Polytechnique de T... more ... Supérieure, 1100, rue Notre-Dame O. Montréal (Qc) H3C 1K3 Canada 3 Ecole Polytechnique de Tunisie , BP 743 La Marsa, 2070 Tunis, Tunisia Email : abdelaziz.hamdi@polymtl.ca,ammar.kouki@etsmtl.ca ... 1999. [3] DR Smith, WJ Padilla, DC Vier, SC Nemat-Nasser, and S ...