Afif Osseiran - Academia.edu (original) (raw)
Papers by Afif Osseiran
This deliverable is the final innovation report from the innovation workpackage in WINNER+. The d... more This deliverable is the final innovation report from the innovation workpackage in WINNER+. The document describes the latest innovations and their assessment as well as summarizes the innovations developed in the work package during the project. We analyze the suitability of these innovations as technology enablers for improving current systems, in particular IMT Advanced and beyond.
For a cellular system with a fixed number of transmit antennas at each base station, we investiga... more For a cellular system with a fixed number of transmit antennas at each base station, we investigate how the system-level performance varies as a function of the geometry of the transmit array used at each base station. Our results show that the system-level performance of a cellular system can be significantly improved by using transmit antenna geometries other than the uniform linear arrays that have been investigated extensively in the literature so far. For example with 4 transmit antennas at each base station, we show that the spectral efficiency for achieving a 5 percentile user data rate of 2 Mbps (in a 5 MHz bandwidth) is improved by 58% when a non-uniform, linear array is used instead of a traditional uniform linear array.
IEEE Vehicular Technology Conference, May 1, 2008
ABSTRACT This paper compares the system level performance of Decode-and Forward (DF) relay and a ... more ABSTRACT This paper compares the system level performance of Decode-and Forward (DF) relay and a RF repeater in a cellular system. The results show that for small cell sizes, the repeater system can bring higher cell spectrum efficiency gain than the relay system since repeaters in contrast to the relays are assumed to be able to receive and transmit at the same time. However, for larger cell sizes, the relay system can bring higher cell spectrum efficiency gain than the repeater system thanks to the possibility of simultaneous transmission by both the access point and relay node through employment of channel reuse. Irrespectively of cell size, simultaneous transmission by access point and relay node also implies that relays can provide higher system and user throughput than RF repeaters.
Wireless Communications and Mobile Computing, 2006
A discrete-time model of DS-CDMA signalling using multiple transmit and receive antennas employin... more A discrete-time model of DS-CDMA signalling using multiple transmit and receive antennas employing linear transceiver filters is derived. For each link, connecting a base-station to a wireless mobile user, the downlink signal to interference plus noise ratio after despreading is derived analytically, and as a by-product an exact closed-form solution of the orthogonality factor is obtained. The orthogonality factor is derived for any linear receiver structure that is implemented by a bank of correlators and for any linear combining techniques (such as MRC and MMSE), and for any number of transmit and/or receive antennas that utilize transmit (pre-RAKE) and receive (post-RAKE) filtering. The MIMO DS-CDMA model is derived using a filter representation, and is extended to a vector/matrix formulation that permits a systematic and efficient way of computing the SINR in a radio network simulator.
Wiley eBooks, Sep 30, 2009
IEEE communications standards magazine, Jun 1, 2022
Future cellular networks are expected to provide significantly higher capacity than today&... more Future cellular networks are expected to provide significantly higher capacity than today's systems. To support this higher capacity a denser deployment might be necessary. An alternative way is to deploy Multiple-Input-Multiple-Output (MIMO) base stations (BSs), called advanced BSs, so that the system capacity is improved without increasing the BSs density. This paper compares Single-Input-Single-Output (SISO) BS deployments with MIMO BS
Radio Technologies and Concepts for IMT-Advanced
Page 1. 7 Advanced Antennas Concept for 4G Afif Osseiran Ericsson 7.1 Introduction The beginning ... more Page 1. 7 Advanced Antennas Concept for 4G Afif Osseiran Ericsson 7.1 Introduction The beginning of the nineteenth century witnessed the first transatlantic radio wave trans-mission performed by Marconi. At that time, the ...
IEEE Communications Standards Magazine
Cinquante ans de Shannon aux Codes Turbo -- Concaténation parallèle -- Système de communication -... more Cinquante ans de Shannon aux Codes Turbo -- Concaténation parallèle -- Système de communication -- Codage convolutionnel récursif -- Entrelacement -- Modulation BPSK -- Les types de Canaux -- L'algorithme M.A.P. -- Le principe du maximum A Posteriori -- Notations et règle de décision -- L'algorithme MAP utilisé -- Quelques versions de l'algorithme MAP -- Décodage itératif (Turbo) -- Information extrinsèque -- Décodeur Turbo -- Terminaison du Treillis -- Les méthodes de Terminaison -- Suggestions pour des recherches futures
D3.5 presents relaying as an integral part of the WINNER system concept. The relay based deployme... more D3.5 presents relaying as an integral part of the WINNER system concept. The relay based deployment concept allows deploying the WINNER broadband radio interface cost efficiently. Suitable assumptions have been made on the technical solutions as guideline for the definition of protocol requirements. The relay is presented as part of the overall WINNER system concept in the WINNER logical nodes architecture. Further the logical nodes architecture and the relation between functions in system layers and specific logical nodes is shown. Protocols and functions are presented that are necessary to implement relaying in the WINNER system concept. Therefore the protocols of different layers namely the radio resource control layer, the radio link control layer and the medium access control layer have been investigated in more detail, also under consideration of the physical layer aspects. In addition to that two add-on solutions to increase the efficiency of relay based technologies have been investigated and are described. These add-ons are cooperative relaying and mobile relays.
This report provides the baseline assumption related to environment, deployment, system design, a... more This report provides the baseline assumption related to environment, deployment, system design, and algorithms for the three test scenarios "base coverage urban", "microcellular", and "indoor" in which the WINNER system is exemplified and evaluated. Associated key assessment criteria are defined. Keyword list: baseline design, test scenarios, simulation assumptions, deployment, assessment criteria
L'invention concerne une technique d'estimation d'un canal radio destinee a etre util... more L'invention concerne une technique d'estimation d'un canal radio destinee a etre utilisee dans un systeme de communications radio base sur le multiplexage par repartition orthogonale de la frequence (OFDM). Un bloc de symboles OFDM est envoye depuis plusieurs antennes sur plusieurs frequences de sous-porteuses. Le bloc de symboles OFDM comprend des symboles pilotes connus, ainsi que des symboles de donnees devant etre determines par un recepteur. Les symboles pilotes sont transmis sous une forme predeterminee a certains moments sur des sous-porteuses periodiques. Une estimation de canal pilote est determines pour chaque symbole pilote dans le bloc recu des symboles OFDM. Une matrice NxM de points correspondant au bloc de symboles OFDM recus est ainsi formee, N etant le nombre de sous-porteuses et M le nombre de symboles OFDM dans le bloc. La matrice est formee par insertion des estimations du canal pilote a des positions predeterminees dans la matrice Nx M conformement a...
In this paper, single carrier frequency domain equalization with space time transmit diversity wa... more In this paper, single carrier frequency domain equalization with space time transmit diversity was implemented and evaluated in real-time using a DSP-based wireless MIMO test-bed. The implemented schemes supported a large set of modulations, from BPSK up to QAM64. Zero padding is introduced to mitigate inter-block interference. Robust time and frequency synchronization together with channel estimation based on Kalman filtering is used to address the adverse intersymbol interference and the severe carrier frequency offset due to hardware impairments
IEEE Communications Standards Magazine, 2020
IEEE Communications Standards Magazine, 2017
This deliverable is the final innovation report from the innovation workpackage in WINNER+. The d... more This deliverable is the final innovation report from the innovation workpackage in WINNER+. The document describes the latest innovations and their assessment as well as summarizes the innovations developed in the work package during the project. We analyze the suitability of these innovations as technology enablers for improving current systems, in particular IMT Advanced and beyond.
For a cellular system with a fixed number of transmit antennas at each base station, we investiga... more For a cellular system with a fixed number of transmit antennas at each base station, we investigate how the system-level performance varies as a function of the geometry of the transmit array used at each base station. Our results show that the system-level performance of a cellular system can be significantly improved by using transmit antenna geometries other than the uniform linear arrays that have been investigated extensively in the literature so far. For example with 4 transmit antennas at each base station, we show that the spectral efficiency for achieving a 5 percentile user data rate of 2 Mbps (in a 5 MHz bandwidth) is improved by 58% when a non-uniform, linear array is used instead of a traditional uniform linear array.
IEEE Vehicular Technology Conference, May 1, 2008
ABSTRACT This paper compares the system level performance of Decode-and Forward (DF) relay and a ... more ABSTRACT This paper compares the system level performance of Decode-and Forward (DF) relay and a RF repeater in a cellular system. The results show that for small cell sizes, the repeater system can bring higher cell spectrum efficiency gain than the relay system since repeaters in contrast to the relays are assumed to be able to receive and transmit at the same time. However, for larger cell sizes, the relay system can bring higher cell spectrum efficiency gain than the repeater system thanks to the possibility of simultaneous transmission by both the access point and relay node through employment of channel reuse. Irrespectively of cell size, simultaneous transmission by access point and relay node also implies that relays can provide higher system and user throughput than RF repeaters.
Wireless Communications and Mobile Computing, 2006
A discrete-time model of DS-CDMA signalling using multiple transmit and receive antennas employin... more A discrete-time model of DS-CDMA signalling using multiple transmit and receive antennas employing linear transceiver filters is derived. For each link, connecting a base-station to a wireless mobile user, the downlink signal to interference plus noise ratio after despreading is derived analytically, and as a by-product an exact closed-form solution of the orthogonality factor is obtained. The orthogonality factor is derived for any linear receiver structure that is implemented by a bank of correlators and for any linear combining techniques (such as MRC and MMSE), and for any number of transmit and/or receive antennas that utilize transmit (pre-RAKE) and receive (post-RAKE) filtering. The MIMO DS-CDMA model is derived using a filter representation, and is extended to a vector/matrix formulation that permits a systematic and efficient way of computing the SINR in a radio network simulator.
Wiley eBooks, Sep 30, 2009
IEEE communications standards magazine, Jun 1, 2022
Future cellular networks are expected to provide significantly higher capacity than today&... more Future cellular networks are expected to provide significantly higher capacity than today's systems. To support this higher capacity a denser deployment might be necessary. An alternative way is to deploy Multiple-Input-Multiple-Output (MIMO) base stations (BSs), called advanced BSs, so that the system capacity is improved without increasing the BSs density. This paper compares Single-Input-Single-Output (SISO) BS deployments with MIMO BS
Radio Technologies and Concepts for IMT-Advanced
Page 1. 7 Advanced Antennas Concept for 4G Afif Osseiran Ericsson 7.1 Introduction The beginning ... more Page 1. 7 Advanced Antennas Concept for 4G Afif Osseiran Ericsson 7.1 Introduction The beginning of the nineteenth century witnessed the first transatlantic radio wave trans-mission performed by Marconi. At that time, the ...
IEEE Communications Standards Magazine
Cinquante ans de Shannon aux Codes Turbo -- Concaténation parallèle -- Système de communication -... more Cinquante ans de Shannon aux Codes Turbo -- Concaténation parallèle -- Système de communication -- Codage convolutionnel récursif -- Entrelacement -- Modulation BPSK -- Les types de Canaux -- L'algorithme M.A.P. -- Le principe du maximum A Posteriori -- Notations et règle de décision -- L'algorithme MAP utilisé -- Quelques versions de l'algorithme MAP -- Décodage itératif (Turbo) -- Information extrinsèque -- Décodeur Turbo -- Terminaison du Treillis -- Les méthodes de Terminaison -- Suggestions pour des recherches futures
D3.5 presents relaying as an integral part of the WINNER system concept. The relay based deployme... more D3.5 presents relaying as an integral part of the WINNER system concept. The relay based deployment concept allows deploying the WINNER broadband radio interface cost efficiently. Suitable assumptions have been made on the technical solutions as guideline for the definition of protocol requirements. The relay is presented as part of the overall WINNER system concept in the WINNER logical nodes architecture. Further the logical nodes architecture and the relation between functions in system layers and specific logical nodes is shown. Protocols and functions are presented that are necessary to implement relaying in the WINNER system concept. Therefore the protocols of different layers namely the radio resource control layer, the radio link control layer and the medium access control layer have been investigated in more detail, also under consideration of the physical layer aspects. In addition to that two add-on solutions to increase the efficiency of relay based technologies have been investigated and are described. These add-ons are cooperative relaying and mobile relays.
This report provides the baseline assumption related to environment, deployment, system design, a... more This report provides the baseline assumption related to environment, deployment, system design, and algorithms for the three test scenarios "base coverage urban", "microcellular", and "indoor" in which the WINNER system is exemplified and evaluated. Associated key assessment criteria are defined. Keyword list: baseline design, test scenarios, simulation assumptions, deployment, assessment criteria
L'invention concerne une technique d'estimation d'un canal radio destinee a etre util... more L'invention concerne une technique d'estimation d'un canal radio destinee a etre utilisee dans un systeme de communications radio base sur le multiplexage par repartition orthogonale de la frequence (OFDM). Un bloc de symboles OFDM est envoye depuis plusieurs antennes sur plusieurs frequences de sous-porteuses. Le bloc de symboles OFDM comprend des symboles pilotes connus, ainsi que des symboles de donnees devant etre determines par un recepteur. Les symboles pilotes sont transmis sous une forme predeterminee a certains moments sur des sous-porteuses periodiques. Une estimation de canal pilote est determines pour chaque symbole pilote dans le bloc recu des symboles OFDM. Une matrice NxM de points correspondant au bloc de symboles OFDM recus est ainsi formee, N etant le nombre de sous-porteuses et M le nombre de symboles OFDM dans le bloc. La matrice est formee par insertion des estimations du canal pilote a des positions predeterminees dans la matrice Nx M conformement a...
In this paper, single carrier frequency domain equalization with space time transmit diversity wa... more In this paper, single carrier frequency domain equalization with space time transmit diversity was implemented and evaluated in real-time using a DSP-based wireless MIMO test-bed. The implemented schemes supported a large set of modulations, from BPSK up to QAM64. Zero padding is introduced to mitigate inter-block interference. Robust time and frequency synchronization together with channel estimation based on Kalman filtering is used to address the adverse intersymbol interference and the severe carrier frequency offset due to hardware impairments
IEEE Communications Standards Magazine, 2020
IEEE Communications Standards Magazine, 2017