In this paper,we studied the effect of mutual coupling between MIMO antennas and a method is proposed to reduce it between 2-element micro-strip MIMO antenna systems for handheld devices. To reduce mutual coupling between the MIMO antenna... more
In this paper,we studied the effect of mutual coupling between MIMO antennas and a method is proposed to reduce it between 2-element micro-strip MIMO antenna systems for handheld devices. To reduce mutual coupling between the MIMO antenna element a separate ground plane is designed and the two elements are positioned on the edges of the 2-element MIMO antenna system. A novel idea defined in order to reduce mutual coupling between the closely spaced micro-strip patch elements is adding finger shapes at the edge of each patch antenna to design a new crack finger micro-strip the fingers generate capacitance in between which improved the matching between the patch and the Micro-strip transmission line as well as the mutual coupling reduced from -25 dB to -40 dB. The simulation results showed that the 2-element MIMOsystem covered the frequency of 2.4 GHz, and the gain and directivity are 6.149 dB and 4.399All the simulations were carried out in CST Microwave Studio.
Research Interests:
Wireless Local Area Networks (WLANs) have become an increasingly popular mode of communication and networking, with a wide range of applications in various fields. However, the increasing popularity of WLANs has also led to an increase in... more
Wireless Local Area Networks (WLANs) have become an increasingly popular mode of communication and networking, with a wide range of applications in various fields. However, the increasing popularity of WLANs has also led to an increase in security threats, including denial of service (DoS) attacks. In this study, management-frames-based DoS attacks, in which the attacker floods the network with management frames, are particularly concerning as they can cause widespread disruptions in the network. Attacks known as denial of service (DoS) can target wireless LANs. None of the wireless security mechanisms in use today contemplate defence against them. At the MAC layer, there are multiple vulnerabilities that can be exploited to launch DoS attacks. This paper focuses on designing and developing an artificial neural network (NN) scheme for detecting management-frames-based DoS attacks. The proposed scheme aims to effectively detect fake de-authentication/disassociation frames and improve...
Research Interests:
Research Interests:
Diabetic retinopathy (DR) is a type of eye disease that may be caused in individuals suffering from diabetes which results in vision loss. DR identification and routine diagnosis is a challenging task and may need several screenings.... more
Diabetic retinopathy (DR) is a type of eye disease that may be caused in individuals suffering from diabetes which results in vision loss. DR identification and routine diagnosis is a challenging task and may need several screenings. Early identification of DR has the potential to prevent or delay vision loss. For real-time applications, an automated DR identification approach is required to assist and reduce possible human mistakes. In this research work, we propose a deep neural network and genetic algorithm-based feature selection approach. Five advanced convolutional neural network architectures are used to extract features from the fundus images, i.e., AlexNet, NASNet-Large, VGG-19, Inception V3, and ShuffleNet, followed by genetic algorithm for feature selection and ranking features into high rank (optimal) and lower rank (unsatisfactory). The nonoptimal feature attributes from the training and validation feature vectors are then dropped. Support vector machine- (SVM-) based c...
Research Interests:
Research Interests:
The demand for high data rate, capacity, increasing user mobility as well as low power consumption is increasing daily, where it is considered as main the challenges facing the radio frequency (RF) technology. Therefore, an alternative... more
The demand for high data rate, capacity, increasing user mobility as well as low power consumption is increasing daily, where it is considered as main the challenges facing the radio frequency (RF) technology. Therefore, an alternative technology called visible light communications (VLC) was adopted to overcome these challenges. This technology is expected to support 5G and beyond due to its high and free frequency offered, as well as robust security. The main problem of this research is, the distribution of a few numbers of optical attocells on the ceiling have caused multiple blind areas in the room, and resulted in nonuniformity distribution. Besides that, employing large numbers of optical attocells has caused a severe ISI, which degrades the system performance, and produced large RMS delay. Therefore, to avoid this problem, a new arrangement of optical attocells, in addition to optimizing the VLC system parameters is proposed. In this research, the proposed arrangement of optic...
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting... more
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting is being developed, the laser diode (LD) for illumination. The LED performance suffers from limited bandwidth, in addition to the extra cost. The rendering of the visible light communication links be depending on the power distribution obtained at received optical power level. In this paper, the luminance units with LD components are used for lighting instead of LED, where the impact of semi angle of half power for the LD transmitter and the distribution of power received in indoor VLC links has been demonstrated. The result obtain explained that if half-angle is decrease, then the average light power received increases but this also increases fluctuations in the level of power received.
Research Interests:
Visible light communication (VLC) is a promising candidate that is expected to revolutionize indoor environment communications performance and fulfill fifth generation and beyond (5GB) technologies requirements. It offers high and free... more
Visible light communication (VLC) is a promising candidate that is expected to revolutionize indoor environment communications performance and fulfill fifth generation and beyond (5GB) technologies requirements. It offers high and free bandwidth, electromagnetic interference immunity, low-cost front end and low power consumption. Also, VLC has dual functions that could be utilized in both illumination and communication concurrently. The number of optical attocells (OAs) and their deployment in the room represent the main issue that should be taken into consideration in designing an optimal VLC system. In this paper, we have introduced a new model of five OAs in the typical room. In addition to an investigation of various optical attocells (OAs) deployment models, in which a multi-variable evaluation was performed in terms of received power, illumination, SNR and RMS delay spread in order to determine the optimal OAs model. Also, various modulation schemes performances were investiga...
Research Interests:
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting... more
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting is being developed, the laser diode (LD) for illumination. The LED performance suffers from limited bandwidth, in addition to the extra cost. The rendering of the visible light communication links be depending on the power distribution obtained at received optical power level. In this paper, the luminance units with LD components are used for lighting instead of LED, where the impact of semi angle of half power for the LD transmitter and the distribution of power received in indoor VLC links has been demonstrated. The result obtain explained that if half-angle is decrease, then the average light power received increases but this also increases fluctuations in the level of power received.
Research Interests:
Research Interests:
The shallow underwater acoustic (UWA) channel has been considered one of the most difficult channels for wireless communication because of several shortcomings, such as low data rate, bandwidth limitation, high multipath interference,... more
The shallow underwater acoustic (UWA) channel has been considered one of the most difficult channels for wireless communication because of several shortcomings, such as low data rate, bandwidth limitation, high multipath interference, major Doppler shifts, and severe fading [1–3]. The main motivation to use sound waves over electromagnetic signals is due to the relatively lower attenuation in the underwater environment [4]. A UWA channel has poor communication quality and high propagation delay; consequently, the bit error rate (BER) is increased [5]. However, the channel coding techniques can significantly decrease BER at the expense of some bandwidth loss of communication. The channel coding techniques add a redundancy of useful bits for data protection in a noisy channel [6]. The following commonly employed channel coding techniques in wireless communication have been thoroughly investigated considering UWA: low-density parity check (LDPC) code, convolution code (CC), Reed-Solomo...
Research Interests:
Device to device (D2D) communication is deemed as an emerging technology to support next-generation of cellular networks, it reduces time delay in communication, saves the energy consumption, and offer better spectrum efficiency. The... more
Device to device (D2D) communication is deemed as an emerging technology to support next-generation of cellular networks, it reduces time delay in communication, saves the energy consumption, and offer better spectrum efficiency. The exchange of information between groups of D2D communication connected simultaneously under the umbrella of cellular networks is presented and called internet of things (IoT). The purpose of this paper is to investigate the D2D communication and IoT technology. We present state of the art of these emerging technologies included related works and applications, in conclusion, we present the challenges and new trends of research for both technologies.
Research Interests:
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting... more
Visible Light Communication System (VLC) performance can be evaluated using signal-to-noise ratio (SNR). The system uses Light Emitting Diodes (LED), white lighting for transmitting high speed data, and this lead to solid-state lighting is being developed, the laser diode (LD) for illumination. The LED performance suffers from limited bandwidth, in addition to the extra cost. The rendering of the visible light communication links be depending on the power distribution obtained at received optical power level. In this paper, the luminance units with LD components are used for lighting instead of LED, where the impact of semi angle of half power for the LD transmitter and the distribution of power received in indoor VLC links has been demonstrated. The result obtain explained that if half-angle is decrease, then the average light power received increases but this also increases fluctuations in the level of power received.
Research Interests:
The underwate communication is of great interest of research for many researchers because of increased dealings of human beings with world exists underwater. Underwater Commucation Technology (UCT) is becoming an important part of... more
The underwate communication is of great interest of research for many researchers because of increased dealings of human beings with world exists underwater. Underwater Commucation Technology (UCT) is becoming an important part of communication technologies. These include communication between divers, ships, and network system for autonomous underwater vehicles. However, optical communication with underwater exchange of information is challenged with many issues. In this paper, the attenuation for optical transmission is obervsed for optical waves that are absorbing inside water, in result, suspending particles and planktons produces optical scattering indirectly. In connection, underwater needs to rectify high attenuation regions for analysing ocean composition affects in Deep Ocean. This produces chlorophyll profiles that identify the attenuation in underwater communication.with high attenuation. In past studies, the constant attenuation is observed irrespective of depth of occean...