Papers by Ghassan Qasmarrogy
In this paper, a satellite link budget calculator was done by using MATLAB – GUI program, the lin... more In this paper, a satellite link budget calculator was done by using MATLAB – GUI program, the link budget is represented in one active screen, and it is designed to show the parameters that affects the RF signal when it is passing through the three main parts of the satellite communication system and regardless of the input signal power level. The results of the link budget program with the effects of changing the parameters will be shown inside the same active screen, which makes the users (students and trainers) analyze the reason that causes the weak signal when it reaches the satellite receiver.
Due to the spectacular growth of the wireless services and demands in recent years, Orthogonal Fr... more Due to the spectacular growth of the wireless services and demands in recent years, Orthogonal Frequency Division Multiplexing (OFDM) is a latest and suiTable modulation scheme for commercial high-speed broadband wireless communication systems. OFDM is one of the main techniques proposed to be employed in 4th Generation Wireless Systems. One of the OFDM key parameters is a cyclic Prefix (CP). Cyclic prefix is a guard time length padded with every OFDM symbol to completely alleviate Inter-symbol Interference (ISI) and to preserve orthogonality among OFDM subcarriers as long as the guard time length is sufficiently greater than channel delay spread. This paper analyzes OFDM system and the effect of cyclic prefix and length of cyclic prefix on OFDM system. Besides, compare the performance of the system with and without cyclic prefix. The simulations were carried out over AWGN and Rayleigh fading channels, and the results have been compared with the theoretical ones.
The rapid evaluation of data transmission in wireless communication technologies can show many pr... more The rapid evaluation of data transmission in wireless communication technologies can show many problems. In the previous year's many routing protocols was developed, implemented, and evaluated for transmission of data in the Mobile ad hoc network (MANET), where it envisioned to be a useful technology in military communication systems and other areas. One of the routing protocols used in MANET is the hierarchical routing protocol that considered an energy efficient. Therefore, in this paper, a comprehensive study will be presented of the hierarchical routing protocol for MANET in order to expose new open issues to either improve the existing routing techniques or to develop new routing solutions for other researchers. The reviewed routing protocol is designed to support networks of a medium size, containing approximately between 150 to 250 nodes but less than 3,000 nodes. The reviewed design is intentionally simple to allow ease of implementation in comparison with other MANET protocols that provide similar functionality
The IEEE 802.11b standard is a protocol for proper interconnection
of data communication tool usi... more The IEEE 802.11b standard is a protocol for proper interconnection
of data communication tool using the wireless transmission in
the Local Area Network (LAN). It includes the physical and
the Media Access Control (MAC) layers of the ISO seven-layer
network model. Therefore, investigating its performance with
different ad-hoc network environment is necessary. Previously, a
number of studies investigate the performance of various routing
protocols using different evaluation methods with simulators,
resulting to different outcomes. Thus, there is a need to expand
the spectrum to take into consideration the effects of file size,
numbers of nodes and mobility that were neglected in a specific
environment and compare them with real life scenario MANET
network. This paper present analysis results for the performance
evaluation of transmitting FTP file with AODV routing protocol in
OPNET modeler and real life network for several scenarios with
802.11b wireless networking transmission method. Simulation
results demonstrate that the scenarios with small amount of fixed
and mobile nodes shows better performance. The overall network
performance automatically degrades with the increment of number
of nodes as well as increment of packet size
Network jammers can uncover the reliability of the wireless networks, where the position of the j... more Network jammers can uncover the reliability of the wireless networks, where the position of the jammer
node permit the network to cope with jamming leveraging varieties of defence strategies. Wireless
Bluetooth network is a short range network, where the Bluetooth transceiver is operating in the 2.4 GHz
ISM (industrial, scientific and medical) radio band, and a special type of frequency hopping pattern was
included with the specification of the Bluetooth technology to offer the necessity requirement for the
matching Radio Frequency RF channels. This paper calculates and evaluates the effect of noise power
jammer and follower jammer on the Personal Area Network (PAN) Bluetooth network. The results prove
that the effect on the Bluetooth network depends on many factors such as power density, distance and
immunity technique, which is used in many Bluetooth networks
MANET stands for mobile ad-hoc network that has multi-hop and dynamic nature, where each station
... more MANET stands for mobile ad-hoc network that has multi-hop and dynamic nature, where each station
changes its location frequently and automatically configures itself. In this paper, four routing protocols
that are OLSR, GRP, DSR, and AODV are discussed along with three TCP variants that are SACK, New
Reno and Reno. The main focus of this paper is to study the impact scalability, mobility and traffic loads
on routing protocols and TCP variants. The paper results shows that the proactive protocols OLSR and
GRP outperform the reactive protocols AODV and DSR with the same nodes size, nodes speed, and traffic
load. On the other hand, the TCP variants research reveal the superiority of the TCP SACK variant over
the other two variants in case of adapting to varying network size, while the TCP Reno variant acts more
robustly in varying mobility speeds and traffic loads.
Technologies like Voice, video, ftp, etc. have made Mobile Ad hoc Networks (MANET) important in o... more Technologies like Voice, video, ftp, etc. have made Mobile Ad hoc Networks (MANET) important in our Real life. MANET is a distinctive type of ad-hoc network that has stations changing their locations frequently, and automatically configuring themselves. Nodes can move freely in MANET while transmitting and receiving the data traffic by using wireless radio waves. Consequently, routing has become a vital factor and a key challenge for finding the best route in many MANET environments. The main focus of this paper is to analyze the impact of real time traffic (voice, video conference) and non-real time traffic (HTTP, FTP, Email) on the four routing protocols, Optimized Link State Routing (OLSR), Dynamic Source Routing (DSR), Ad-hoc On-demand Distance Vector (AODV), and Geographical Routing Protocol (GRP) over MANETs and also investigate their performance based on the average end-to-end delay and throughput. It is shown with extensive simulation results that OLSR protocol produces the highest throughput and the lowest delay compared to other protocols for non-real time and real time video traffic. It is also shown that OLSR protocol produces the lowest delay and acceptable throughput for real time voice traffic
The jamming technique which is used to effects on the uplink of the satellite TV broadcast by usi... more The jamming technique which is used to effects on the uplink of the satellite TV broadcast by using Jamming Mobile Ground
Station (J MGS) that leads to block the channel. To resist that jamming signal by adding extra circuits on transponder and
main ground/earth station (GS) and considering the channels which are effect by (JMGS).the circuits has been done to
swapping the frequency carrier of the bouquet as like frequency hopping techniques that mean the frequency carriers of the
bouquets can be switching between them in randomly, suggestion obtain a good results to reduce that effect of jamming on the
channels. The last part of this paper comparison between transponder with and without multi-bouquet hopping circuits of the
Signal power to jamming signal power. The permutations calculation has been done by using the program (MATLAB) and
select one set has long 100 possible of 8 channels for simple calculation
Mobile ad hoc network consists of wireless mobile nodes, where nodes convey message to each other... more Mobile ad hoc network consists of wireless mobile nodes, where nodes convey message to each other without any pre-established infrastructure or centralized control. The wireless ad hoc network eradicates the complications which may arise while setting up the infrastructure. The mobility model is crucial when evaluating routing protocols exhibition in mobile ad hoc networks. Two parameters are very important when dealing with mobility behavior of mobile nodes: pause time and maximum speed. In this paper, we investigate the effect of mobility model on state of art proactive and reactive routing protocols for mobile ad hoc networks. The Reference Point Group Mobility model and the Random Way Point Mobility model represent the group and an entity mobility model used in this simulation to compare and analyze the performance of the routing protocols. In this study the performance analysis and comparison of the routing protocols under different mobility scenarios are evaluated in Network Simulator 2. Four important performance metrics of ad hoc networks including average end-to-end delay, packet delivery ratio, normalized routing load or overhead and average number of hops are considered. Based on the empirical study, both propagation models cause different impact on the AODV and DSDV routing protocol. Where, AODV performs better with the RPGM than the RWPM with respect to end-to end-delay, normalized routing load and average number of hops. However, in delivery ratio AODV performs better with the RWPM than the RPGM. On the other hand, AODV and DSDV protocols have similar results in delivery ratio and average number of hops and DSDV performed better than AODV in normalized routing and end-to-end delay. Finally, it can be concluded that no protocol significantly outperforms the other in all scenarios and matrics considered.
In the last era, the technology of WiMAX (3G) was broadly used for wireless communication systems... more In the last era, the technology of WiMAX (3G) was broadly used for wireless communication systems in many reigns around the world due to its
rich set of features with promising broadband wireless access networks. In this paper the ray tracing combined with uniform theory of diffraction
(UTD),intention UTD modified heuristic diffraction coefficient for non-perfectly conducting wedges will be used to evaluate the normalized
received signal at the end user versus the mobile distance. The combination of single and double diffracted, reflected and direct rays will produce
8 different rays are considered. The required mathematical propagation model of given model will be derived and implemented using Matlab
simulator. The mobile movement from base station that is potentially in Non-Line-Of-Sight (NLOS) and Line-Of-Sight due to lossy building
will be tested within three residential areas. Free space loss and fading due to multipath channel are the main causes of signal degradation of the
propagated signal. The simulations were based on the changes of system parameters which are base station’s antenna height, horizontal distance
between base station and mobile station, mobile station's height and building dimensions.
The obstacle detection in an agricultural field is an important step of the automation of the pla... more The obstacle detection in an agricultural field is an important step of the automation of the plantation. There are already developed autonomous agricultural vehicles that can track a path, and perform the specified processes on the plantation fields. These autonomous agricultural robotic machines need an upper level of control, which is mostly performed manually, for the design of the reference paths. Detection of the agricultural obstacles is necessary to accomplish these manual tasks in an automatic manner. In this paper, statistical methods are employed and compared to determine which of the five well-known edge-detection methods is best, for the high-level path planning in an agricultural automation of autonomous agricultural vehicles depending on field and image properties. Hence, this paper shows that the best technique is Sobel edge detection, it has higher average accuracy in detecting trees around 84% and lower percent misdetection false positive error is 16% also lower false negative error wrong obstacle detection inside the fields is 6.5% total errors for this technique is 22.5% from other techniques which represents a significant result, which is precise enough for any agricultural purpose
International Journal of Neural Networks
In this paper, it is attempted to look into the dissipative stochastic mechanics based neuron mod... more In this paper, it is attempted to look into the dissipative stochastic mechanics based neuron model under noisy input currents. Spe-cifically, it is concentrated on the role of input noise with reference to the renormalization terms in the model. The investigation shows that the use of noise in the inputs can improve the spiking rates and the spike coherence values, especially in the presence of the renormalization terms.
The advent of wireless technology is one of the biggest breakthroughs of the modern era, this tec... more The advent of wireless technology is one of the biggest breakthroughs of the modern era, this technology enables the users to utilize the freedom of movement and the use of the equipment while on the move. Mobile Ad-hoc Network is a special point of focus for industry and academic researchers from all around the globe. This technology has come with its own flavour as it is easy to deploy in disaster areas and for emergency operations. MANET creates a temporary environment of mobile nodes without the need of any centralized networks. The nodes collaborate with each other to send and forward packets to destination nodes. Mobile Ad hoc Network do not rely on wired network routing protocols. It uses its own Ad hoc routing protocols that are entirely different from the tradition wired network as routing path breaks due to self-organized nodes while discovering multi hop routes through network. Video streaming applications are of various types like video Conferencing, video chat, video on demand and live video streaming. These different applications have different resource requirements which shall be met by MANET according to the availability of resources, In this paper, a comprehensive simulation based on a comparative study over MANET is performed on video streaming applications under two types of routing protocols covering reactive, and proactive routing protocols namely Optimized Link State Routing (OLSR) and Ad hoc On-Demand Distance Vector (AODV), both these protocols have been considered for investigation by using OPNET simulation, throughput, delay, Load and Data retransmission metrics have been used for measuring these protocols.
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Papers by Ghassan Qasmarrogy
of data communication tool using the wireless transmission in
the Local Area Network (LAN). It includes the physical and
the Media Access Control (MAC) layers of the ISO seven-layer
network model. Therefore, investigating its performance with
different ad-hoc network environment is necessary. Previously, a
number of studies investigate the performance of various routing
protocols using different evaluation methods with simulators,
resulting to different outcomes. Thus, there is a need to expand
the spectrum to take into consideration the effects of file size,
numbers of nodes and mobility that were neglected in a specific
environment and compare them with real life scenario MANET
network. This paper present analysis results for the performance
evaluation of transmitting FTP file with AODV routing protocol in
OPNET modeler and real life network for several scenarios with
802.11b wireless networking transmission method. Simulation
results demonstrate that the scenarios with small amount of fixed
and mobile nodes shows better performance. The overall network
performance automatically degrades with the increment of number
of nodes as well as increment of packet size
node permit the network to cope with jamming leveraging varieties of defence strategies. Wireless
Bluetooth network is a short range network, where the Bluetooth transceiver is operating in the 2.4 GHz
ISM (industrial, scientific and medical) radio band, and a special type of frequency hopping pattern was
included with the specification of the Bluetooth technology to offer the necessity requirement for the
matching Radio Frequency RF channels. This paper calculates and evaluates the effect of noise power
jammer and follower jammer on the Personal Area Network (PAN) Bluetooth network. The results prove
that the effect on the Bluetooth network depends on many factors such as power density, distance and
immunity technique, which is used in many Bluetooth networks
changes its location frequently and automatically configures itself. In this paper, four routing protocols
that are OLSR, GRP, DSR, and AODV are discussed along with three TCP variants that are SACK, New
Reno and Reno. The main focus of this paper is to study the impact scalability, mobility and traffic loads
on routing protocols and TCP variants. The paper results shows that the proactive protocols OLSR and
GRP outperform the reactive protocols AODV and DSR with the same nodes size, nodes speed, and traffic
load. On the other hand, the TCP variants research reveal the superiority of the TCP SACK variant over
the other two variants in case of adapting to varying network size, while the TCP Reno variant acts more
robustly in varying mobility speeds and traffic loads.
Station (J MGS) that leads to block the channel. To resist that jamming signal by adding extra circuits on transponder and
main ground/earth station (GS) and considering the channels which are effect by (JMGS).the circuits has been done to
swapping the frequency carrier of the bouquet as like frequency hopping techniques that mean the frequency carriers of the
bouquets can be switching between them in randomly, suggestion obtain a good results to reduce that effect of jamming on the
channels. The last part of this paper comparison between transponder with and without multi-bouquet hopping circuits of the
Signal power to jamming signal power. The permutations calculation has been done by using the program (MATLAB) and
select one set has long 100 possible of 8 channels for simple calculation
rich set of features with promising broadband wireless access networks. In this paper the ray tracing combined with uniform theory of diffraction
(UTD),intention UTD modified heuristic diffraction coefficient for non-perfectly conducting wedges will be used to evaluate the normalized
received signal at the end user versus the mobile distance. The combination of single and double diffracted, reflected and direct rays will produce
8 different rays are considered. The required mathematical propagation model of given model will be derived and implemented using Matlab
simulator. The mobile movement from base station that is potentially in Non-Line-Of-Sight (NLOS) and Line-Of-Sight due to lossy building
will be tested within three residential areas. Free space loss and fading due to multipath channel are the main causes of signal degradation of the
propagated signal. The simulations were based on the changes of system parameters which are base station’s antenna height, horizontal distance
between base station and mobile station, mobile station's height and building dimensions.
of data communication tool using the wireless transmission in
the Local Area Network (LAN). It includes the physical and
the Media Access Control (MAC) layers of the ISO seven-layer
network model. Therefore, investigating its performance with
different ad-hoc network environment is necessary. Previously, a
number of studies investigate the performance of various routing
protocols using different evaluation methods with simulators,
resulting to different outcomes. Thus, there is a need to expand
the spectrum to take into consideration the effects of file size,
numbers of nodes and mobility that were neglected in a specific
environment and compare them with real life scenario MANET
network. This paper present analysis results for the performance
evaluation of transmitting FTP file with AODV routing protocol in
OPNET modeler and real life network for several scenarios with
802.11b wireless networking transmission method. Simulation
results demonstrate that the scenarios with small amount of fixed
and mobile nodes shows better performance. The overall network
performance automatically degrades with the increment of number
of nodes as well as increment of packet size
node permit the network to cope with jamming leveraging varieties of defence strategies. Wireless
Bluetooth network is a short range network, where the Bluetooth transceiver is operating in the 2.4 GHz
ISM (industrial, scientific and medical) radio band, and a special type of frequency hopping pattern was
included with the specification of the Bluetooth technology to offer the necessity requirement for the
matching Radio Frequency RF channels. This paper calculates and evaluates the effect of noise power
jammer and follower jammer on the Personal Area Network (PAN) Bluetooth network. The results prove
that the effect on the Bluetooth network depends on many factors such as power density, distance and
immunity technique, which is used in many Bluetooth networks
changes its location frequently and automatically configures itself. In this paper, four routing protocols
that are OLSR, GRP, DSR, and AODV are discussed along with three TCP variants that are SACK, New
Reno and Reno. The main focus of this paper is to study the impact scalability, mobility and traffic loads
on routing protocols and TCP variants. The paper results shows that the proactive protocols OLSR and
GRP outperform the reactive protocols AODV and DSR with the same nodes size, nodes speed, and traffic
load. On the other hand, the TCP variants research reveal the superiority of the TCP SACK variant over
the other two variants in case of adapting to varying network size, while the TCP Reno variant acts more
robustly in varying mobility speeds and traffic loads.
Station (J MGS) that leads to block the channel. To resist that jamming signal by adding extra circuits on transponder and
main ground/earth station (GS) and considering the channels which are effect by (JMGS).the circuits has been done to
swapping the frequency carrier of the bouquet as like frequency hopping techniques that mean the frequency carriers of the
bouquets can be switching between them in randomly, suggestion obtain a good results to reduce that effect of jamming on the
channels. The last part of this paper comparison between transponder with and without multi-bouquet hopping circuits of the
Signal power to jamming signal power. The permutations calculation has been done by using the program (MATLAB) and
select one set has long 100 possible of 8 channels for simple calculation
rich set of features with promising broadband wireless access networks. In this paper the ray tracing combined with uniform theory of diffraction
(UTD),intention UTD modified heuristic diffraction coefficient for non-perfectly conducting wedges will be used to evaluate the normalized
received signal at the end user versus the mobile distance. The combination of single and double diffracted, reflected and direct rays will produce
8 different rays are considered. The required mathematical propagation model of given model will be derived and implemented using Matlab
simulator. The mobile movement from base station that is potentially in Non-Line-Of-Sight (NLOS) and Line-Of-Sight due to lossy building
will be tested within three residential areas. Free space loss and fading due to multipath channel are the main causes of signal degradation of the
propagated signal. The simulations were based on the changes of system parameters which are base station’s antenna height, horizontal distance
between base station and mobile station, mobile station's height and building dimensions.