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Papers by saad ahmed ayoob

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9 September 2021, Sakarya, Turkey, 2022

Non-orthogonal Multiple access (NOMA) is a 5G wireless connectivity technology. It aims to improv... more Non-orthogonal Multiple access (NOMA) is a 5G wireless connectivity technology. It aims to improve user (UE) service at cell edge (CE) by pairing with the UE at cell center (CC). User velocity is an important component of 5G communication systems. This paper investigates the presence of a Doppler shift effect (DSE) for the movement of a user in NOMA cell. Also, the emphasis in this search is on DSE for users (UEs) at the CC and on the user's velocity at 180km/h. The method used for the simulation, Link (LL) Level emulator for Vienna 5G. Through the NOMA principle, the results demonstrate that DSE was evident on the UE in center of the cellular network. When changing user's speed from 0 to 180 km/h, the user's efficiency changed from 4.937 Mbit/s to 0.6418 Mbit/s at transmitted Power of eNB equal 25dBm. In other expression, due to an increase in the UE's speed and DSE, the user's throughput decreases by nine times his efficiency at speed = 0 km / h. By increasing number of eNB antennas, MIMO (8X2) has achieved 4 times better user efficiency improvement than MIMO (2X2). The number of UE antennas is increased antennas to four and changing number of eNB antennas, MIMO (2X4) enables to maintain user's throughput at high speed and DSE. In this type of MIMO, the user's efficiency has reached a result close to that of UE when his motion is stationary.

AL-Rafdain Engineering Journal (AREJ)

2021 7th International Conference on Contemporary Information Technology and Mathematics (ICCITM)

Massive multiple-input multiple-output (MIMO) and Millimeter-wave (mmWave) techniques are the mai... more Massive multiple-input multiple-output (MIMO) and Millimeter-wave (mmWave) techniques are the main factors that support modern wireless communications. Use of mmWave technology is a major factor in solving the problem of throttling congestion in the current bandwidth, as the use of mmWave leads to a significant increase in data rate, throughput and capacity. In this paper, we investigated and studied performance of 5G multi-user (MU) massive MIMO mmWave communication and obtained output results (Spectral Efficiency), using three beamforming methods: conjugate beamforming (CB), minimum mean squared error (MMSE), and zero-forcing (ZF) through mm-Wave Channel by using multiple frequencies (28GHz and 38 GHz) and we explained which one of them is better in terms of spectrum efficiency.

International Journal of Computer Applications, 2018

LTE-A introduced many new features and techniques, one of these techniques is the Coordinated Mul... more LTE-A introduced many new features and techniques, one of these techniques is the Coordinated Multi-Point (CoMP) technique. This technology has a significant role in improving the performance of the cell, especially cell-edge throughput of users, by reducing the impact of Inter Cell Interference (ICI) and increasing throughput and spectral efficiency. This paper provided a modeling and simulation of CoMP technology, Where the CoMP Joint Processing (JP) is adopted. System level simulation (V1.9) is licensed by University of Vienna to model and simulate CoMP technique. It is known that the resource block (RB) is directly proportional to the increase in the bandwidth, but the bandwidth is not always available. Therefore, this paper considers the effect of changing the bandwidth on the mean number RB occupancy, average user throughout and spectral efficiency with changing the number of users per cell at different Transmission Time interval (TTI). The simulation results show the relationship between the bandwidth and the RB and other relationships.

LTE networks are the latest generation of wireless networks based on IP architecture; it is stand... more LTE networks are the latest generation of wireless networks based on IP architecture; it is standardized by the 3GPP in its Rel.8. LTE networks are implemented practically to access internet with very high data rates with using various multimedia services. This paper is based on five types of downlink packet scheduling algorithms in LTE networks, It examines the impact of throughput, the fairness and the spectral efficiency of each scheduling algorithms when the speed of UE (User Equipment) and the number of UEs are changed. A comparison between the scheduling algorithms has been done using Vienna LTE SYSTEM LEVEL Simulator.

2021 4th International Conference on Information and Communications Technology (ICOIACT)

2021 4th International Conference on Information and Communications Technology (ICOIACT)

AL-Rafdain Engineering Journal (AREJ), Oct 28, 2012

Wireless ad-hoc networks with different topologies proved to be a feasible solution for low-cost ... more Wireless ad-hoc networks with different topologies proved to be a feasible solution for low-cost deployment of computer networks. It provides quick and easy networking in circumstances that require temporary network services or when cabling is difficult to be installed. In this paper, an analytical model of a wireless ad-hoc network is presented, in addition, a new model for wireless ad-hoc network with a sub-layer MAC is designed using Simevents tools. It is also taken into account the effect of the contention process and losses on the sub-layer MAC, then OPNET software is used to validate this model. Finally, the results of a practical single-hop wireless ad-hoc network using six computers are compared with the results of the proposed models. It is obvious that there is an excellent agreement between the throughput performances of the different models.

AL-Rafdain Engineering Journal (AREJ)

2013 International Conference on Electrical Communication, Computer, Power, and Control Engineering (ICECCPCE), 2013

 Mobile communication channel propagation models are usually studied in terms of large scale or ... more  Mobile communication channel propagation models are usually studied in terms of large scale or small scale.

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9 September 2021, Sakarya, Turkey, 2022

Non-orthogonal Multiple access (NOMA) is a 5G wireless connectivity technology. It aims to improv... more Non-orthogonal Multiple access (NOMA) is a 5G wireless connectivity technology. It aims to improve user (UE) service at cell edge (CE) by pairing with the UE at cell center (CC). User velocity is an important component of 5G communication systems. This paper investigates the presence of a Doppler shift effect (DSE) for the movement of a user in NOMA cell. Also, the emphasis in this search is on DSE for users (UEs) at the CC and on the user's velocity at 180km/h. The method used for the simulation, Link (LL) Level emulator for Vienna 5G. Through the NOMA principle, the results demonstrate that DSE was evident on the UE in center of the cellular network. When changing user's speed from 0 to 180 km/h, the user's efficiency changed from 4.937 Mbit/s to 0.6418 Mbit/s at transmitted Power of eNB equal 25dBm. In other expression, due to an increase in the UE's speed and DSE, the user's throughput decreases by nine times his efficiency at speed = 0 km / h. By increasing number of eNB antennas, MIMO (8X2) has achieved 4 times better user efficiency improvement than MIMO (2X2). The number of UE antennas is increased antennas to four and changing number of eNB antennas, MIMO (2X4) enables to maintain user's throughput at high speed and DSE. In this type of MIMO, the user's efficiency has reached a result close to that of UE when his motion is stationary.

AL-Rafdain Engineering Journal (AREJ)

2021 7th International Conference on Contemporary Information Technology and Mathematics (ICCITM)

Massive multiple-input multiple-output (MIMO) and Millimeter-wave (mmWave) techniques are the mai... more Massive multiple-input multiple-output (MIMO) and Millimeter-wave (mmWave) techniques are the main factors that support modern wireless communications. Use of mmWave technology is a major factor in solving the problem of throttling congestion in the current bandwidth, as the use of mmWave leads to a significant increase in data rate, throughput and capacity. In this paper, we investigated and studied performance of 5G multi-user (MU) massive MIMO mmWave communication and obtained output results (Spectral Efficiency), using three beamforming methods: conjugate beamforming (CB), minimum mean squared error (MMSE), and zero-forcing (ZF) through mm-Wave Channel by using multiple frequencies (28GHz and 38 GHz) and we explained which one of them is better in terms of spectrum efficiency.

International Journal of Computer Applications, 2018

LTE-A introduced many new features and techniques, one of these techniques is the Coordinated Mul... more LTE-A introduced many new features and techniques, one of these techniques is the Coordinated Multi-Point (CoMP) technique. This technology has a significant role in improving the performance of the cell, especially cell-edge throughput of users, by reducing the impact of Inter Cell Interference (ICI) and increasing throughput and spectral efficiency. This paper provided a modeling and simulation of CoMP technology, Where the CoMP Joint Processing (JP) is adopted. System level simulation (V1.9) is licensed by University of Vienna to model and simulate CoMP technique. It is known that the resource block (RB) is directly proportional to the increase in the bandwidth, but the bandwidth is not always available. Therefore, this paper considers the effect of changing the bandwidth on the mean number RB occupancy, average user throughout and spectral efficiency with changing the number of users per cell at different Transmission Time interval (TTI). The simulation results show the relationship between the bandwidth and the RB and other relationships.

LTE networks are the latest generation of wireless networks based on IP architecture; it is stand... more LTE networks are the latest generation of wireless networks based on IP architecture; it is standardized by the 3GPP in its Rel.8. LTE networks are implemented practically to access internet with very high data rates with using various multimedia services. This paper is based on five types of downlink packet scheduling algorithms in LTE networks, It examines the impact of throughput, the fairness and the spectral efficiency of each scheduling algorithms when the speed of UE (User Equipment) and the number of UEs are changed. A comparison between the scheduling algorithms has been done using Vienna LTE SYSTEM LEVEL Simulator.

2021 4th International Conference on Information and Communications Technology (ICOIACT)

2021 4th International Conference on Information and Communications Technology (ICOIACT)

AL-Rafdain Engineering Journal (AREJ), Oct 28, 2012

Wireless ad-hoc networks with different topologies proved to be a feasible solution for low-cost ... more Wireless ad-hoc networks with different topologies proved to be a feasible solution for low-cost deployment of computer networks. It provides quick and easy networking in circumstances that require temporary network services or when cabling is difficult to be installed. In this paper, an analytical model of a wireless ad-hoc network is presented, in addition, a new model for wireless ad-hoc network with a sub-layer MAC is designed using Simevents tools. It is also taken into account the effect of the contention process and losses on the sub-layer MAC, then OPNET software is used to validate this model. Finally, the results of a practical single-hop wireless ad-hoc network using six computers are compared with the results of the proposed models. It is obvious that there is an excellent agreement between the throughput performances of the different models.

AL-Rafdain Engineering Journal (AREJ)

2013 International Conference on Electrical Communication, Computer, Power, and Control Engineering (ICECCPCE), 2013

 Mobile communication channel propagation models are usually studied in terms of large scale or ... more  Mobile communication channel propagation models are usually studied in terms of large scale or small scale.