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البحوث المنشورة

البحث (1):

عنوان البحث:

Designing an Effective Intersection Collision Warning System: An Investigation into Important Criteria

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تاريخ النشر:

January, 2014

موجز عن البحث:

The emergence of Vehicular Ad Hoc Networks has made effective communications between vehicle and infrastructure possible. Such systems enable the provision of many services in the automobile environment, including safety, traffic management and monitoring, and comfort. Moreover, there are many wireless communication technologies that have been developed and exclusively designed for Vehicular Networks to enable the distinct characteristics of such networks to be effectively implemented. Dedicated Short Range Communication is one wireless communication technology, amongst others, that has been developed for this purpose. Intersection collision warning applications have attracted wide attention as a potential way to improve vehicle safety at intersections. Accidents at or near to intersections account for the highest percentage of total accidents rate. In this paper, an investigation of vehicular networks and wireless communication technologies that support such networks is summarized as information about the implementation of potential safety applications. This paper also investigates effective criteria for designing a low-cost intersection collision warning application that will effectively improve vehicle safety at intersections.

البحث (2):

عنوان البحث:

Doppler Reduction Effect on the Performance of IEEE 802.11a Based on Sub-Frequency Band Algorithm

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تاريخ النشر:

December, 2015

موجز عن البحث:

Over the last decade, the development of IEEE 802.11a which referred to as Local Area Network (LAN) standard is rapidly advancing. This is due to the limitation and what Orthogonal Frequency Division Multiplexing (OFDM), which is used in the heart of LAN standard, susceptible to like carrier frequency offset and hence higher Bits Error Rate (BER). In this paper, the performance of IEEE 802.11a based on a sub-frequency band algorithm was investigated and tested over Additive White Gaussian Noise and Rician channels and under different Doppler frequency effects. The proposed system was investigated over the physical layer of IEEE 802.11a. Within the transmitter, the data vector of 64-bits is divided into three equal vectors of 21 bits each, with the last bit discarded. Each vector was then processed by fast Fourier transform block, with the output of each block processed by a proposed algorithm and then the total vector of length 64-bits converted to a time domain signal via the inverse fast Fourier transform. Within the receiver, the inverse procedure is used to recover the transmitted signals. The results show that the proposed algorithm outperforms the standard OFDM model in terms of Bit Error Rate (BER) versus Signal to Noise Ratio (SNR).

البحث (3):

عنوان البحث:

A Transmission Scheme for Communications Systems Using Wavelet Transform and Comparison with Fourier Transform

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تاريخ النشر:

10/03/2016

موجز عن البحث:

Over the last three decades the demand for wireless communications has increased dramatically. Consequently, the need for adapting such a demand has also increased putting pressure on scientist and researchers to develop more advanced techniques that are capable of handle such a demand. However, the bandwidth limitation increased the pressure on developers as it is the focus point and band limited of any communication system. During the 1970s scientists came up with Orthogonal Frequency Division Multiplex (OFDM) technology with the use of Fast Fourier Transform (FFT) which was remarkable discovery at that time as it saves up to 50% of bandwidth. Since then OFDM is the adapted technology in most of communication standards including DVB-Ts, LAN, MAN, Wi-Fi, WiMAX and VANET. Short-Time Fourier Transform (STFT) was developed due to the need for analyzing the signal in time-frequency domain in order to visualize the features of any signal. However, due to the fact that this technique is time limit ed and localized due to the usage of fixed time sliding window. The discovery of Wavelet transform is a result of the need for further development from the limitation of Fourier Transform (FT) and STFT. It is being used now in several applications across signal and image processing, i.e. image and video compression, watermarking and medical applications. This paper suggests the use of Discrete Wavelet Transform (DWT) to modulate signals for transmission. Orthogonal Wavelet Division Multiplex (OWDM) is proposed and DVB-T standard is used for baseline comparison with OFDM system. It is shown that OWDM modulation technique could save up to 25% of the bandwidth over conventional OFDM system. Investigating this brand new technology could open a new window for new modulation technique with lower complexity, bandwidth conservation, flexibility and cost effectiveness.

المؤتمرات العلمية:

المؤتمر (1):

عنوان المؤتمر:

IEEE International Conference on Consumer Electronics Berlin (ICCE-Berlin), 2013

تاريخ الإنعقاد:

09 – 11/09/2013

بلد ومكان الإنعقاد:

Berlin, Germany

طبيعة المشاركة:

Presentation of paper

عنوان المشاركة:

Orthogonal Wavelet Division Multiplex as a Modulation Scheme for Digital Television

ملخص المشاركة

Issues surrounding wireless communications have arisen as a result of an increase in popularity and usability. The complexity of modulating signals over carriers is considered to be a significant challenge and Orthogonal Frequency Division Multiplex has proven to be a popular technology. The discovery of the wavelet transform, while mainly used in image processing applications, has led to a recently proposed, innovative new modulation technique called Orthogonal Wavelet Division Multiplex. This paper looks at the application of different families of wavelet as applied to digital terrestrial television.

المؤتمر (2):

عنوان المؤتمر:

8th Saudi Students Conference in the UK

تاريخ الإنعقاد:

31/01/2015

مكان الإنعقاد:

London, UK

طبيعة المشاركة:

Poster Presentation

عنوان المشاركة:

A Novel Transmission Scheme for Wireless Communications Using Wavelet Transform

ملخص المشاركة:

The demand for efficient wireless communication systems has increased dramatically over the years. Orthogonal Frequency Division Multiplex (OFDM) technology, based on the use of Fast Fourier Transforms (FFT), was introduced during the 1970’s, leading to bandwidth savings of up to 50%. Since then, OFDM has been adopted in most communication standards including DVB-T, MAN and VANET. The introduction of multiresolution Wavelet transforms in late 1980’s and early 1990’s, which unlike Fourier transforms are adaptive and localised in both time (or space) and frequency, has revolutionised the way signals are processed. This research suggests the use of Discrete Wavelet Transforms (DWT) to modulate signals for transmission, instead of the classical FFT approach. An Asymmetric Orthogonal Wavelet Division Multiplex (AOWDM) scheme is proposed and further investigated. The DVB-T standard is used for baseline comparison between the AOWDM and OFDM systems.

المؤتمر (3):

عنوان المؤتمر:

MELECON 2014 – 17th IEEE Mediterranean Electrotechnical Conference

تاريخ الإنعقاد:

13-16/04/2014

مكان الإنعقاد:

Beirut, Lebanon

طبيعة المشاركة:

Paper Presentation

عنوان المشاركة:

An advanced modulation scheme for mobile broadcasting

ملخص المشاركة:

Issues surrounding wireless communications have arisen as a result of an increase in popularity and usability. The complexity of modulating signals onto carriers while optimizing bandwidth usage has always been considered to be one of the most significant challenges. The discovery of the wavelet transform has opened up a number of potential applications from image compression to watermarking and encryption. In the past, work has been done to investigate the potential of using wavelet transforms within the communication space. This paper will further investigate a recently proposed, innovative, modulation technique, Orthogonal Wavelet Division Multiplex, which utilizes the wavelet transform opening a new avenue for an alternative modulation scheme with some interesting potential characteristics.

المؤتمر (4):

عنوان المؤتمر:

3rd  International Renewable and Sustainable Energy Conference – IRSEC’15

تاريخ الإنعقاد:

10-13/12/2015

مكان الإنعقاد:

Marrakech, Morocco

طبيعة المشاركة:

Paper Presentation

عنوان المشاركة:

Impact of PV Array Emulator on Power Quality of PV Inverter Compared to a Real PV Array

ملخص المشاركة:

One of the greatest challenges is sustainable energy production. As fossil fuels are depleted, the search for different energy sources becomes increasingly urgent. Therefore, the security, affordability, sustainability, and reliability to future demands to generate power systems for the long-term that are flexible and resilient are required. Total Harmonic Distortion (THD) is very important criteria to evaluate power quality in the grid connected inverter which is known as a Photovoltaic (PV) inverter. The THD of the output voltage and current of the PV inverter should comply with the required criteria of the IEEE-1547 standard. Due to variation of the solar energy with changing in weather conditions, the generated powers have intermittency which can cause the many problems in distribution power and customer such as increase heating of the distribution transformers and wires an example.

The power quality of the output voltage and current of the commercial PV inverter is investigated after designing the Photovoltaic Array Emulator (PVAE) and compared to a real photovoltaic array. The numerical model of the solar system includes the photovoltaic, the grid connected inverter and its controller along with the grid is presented. The power quality of the commercial PV inverter improves with the PVAE compared to an actual photovoltaic array. However, this improvement of power quality does not comply with the IEEE-1547 standard, and therefore, the use a bidirectional inverter with battery storage to improve the generated power of the solar system is proposed. The proposed method can provide fast active and reactive power to the load with a minimum THD of the output current to 0.64%.

أنشطة ثقافية إبداعية:

النشاط (1):

مسمى النشاط:

Young Professionals Committee Chair at IEEE Consumer Electronics Society

الجهة المقيمة:

IEEE Consumer Electronics Society

تاريخ التقييم:

07/10/2015

طبيعة النشاط:

Chairman of Young Professionals Committee at IEEE Consumer Electronics Society. Member of the Board of Governors of IEEE Consumer Electronics Society. Also a member of global IEEE Young Professionals Committee

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