Zeyad M Elkwash - Academia.edu (original) (raw)

Papers by Zeyad M Elkwash

International Science and Technology Journal, 2021

The utilization of WiMAX technology has led to an increasing number of base stations being built ... more The utilization of WiMAX technology has led to an increasing number of base stations being built in populated regions. Repeated exposure to WiMAX electromagnetic radiation has raised public worry of probable health impacts to individuals in the vicinity of WiMAX Base Stations. The estimation of the power density of the radiation is achievable by knowing the antenna's technical data and the location of the exposed person. In this a paper, Theoretical assessment of power density is performed on areas near WiMAX base stations and compared to the recommendations provided by the International Commission on Non-Ionizing Radiation Protection (ICPNIR).[1] ‫الملخص‬ ‫تقٌُت‬ ‫استخذام‬ ‫أدي‬ ‫هاكس‬ ‫واٌ‬ ‫فٍ‬ ‫بٌاؤها‬ ‫تن‬ ‫التٍ‬ ‫األساسُت‬ ‫الوحطاث‬ ‫ػذد‬ ‫سَادة‬ ‫ئلً‬ ‫بالسكاى‬ ‫الوأهىلت‬ ‫الوٌاطق‬. ‫إلشؼاع‬ ‫الوتكزر‬ ‫التؼزض‬ ‫هاكس‬ ‫واٌ‬ ‫أثار‬ ‫الكهزوهغٌاطُسٍ‬

2013 The International Conference on Technological Advances in Electrical, Electronics and Computer Engineering (TAEECE), 2013

In WiMAX technology: orthogonal Frequency Multiplexing (OFDM) can provide large data rates with s... more In WiMAX technology: orthogonal Frequency Multiplexing (OFDM) can provide large data rates with sufficient robustness to multipath fading. A guard time, in the form of cyclic prefix (CP) is inserted between OFDM symbols to eliminate both the inter-symbol interference (ISI) and the inter-channel interference (ICI). This paper aims to implement a WiMAX system using Simulink of MATLAB. The simulation is used to study the effect of the cyclic prefix on the bit error rate (BER) with different types of modulation techniques (BPSK, 4QAM, 16QAM, and 64QAM) based on the variation in gain vector, delay vector, and signal to noise ratio (SNR). The simulation results of all cases are compared to specified the values of cyclic prefix, gain vector, delay vector, and modulation technique that give the lowest values of BER. Based on these values the performance evaluation of WiMAX communication is done.

At high frequencies, analyzing and designing microwave communication systems demands considering ... more At high frequencies, analyzing and designing microwave communication systems demands considering rain fade. In this paper, the rain fade is evaluated based on the ITU-R P.618-10 rain model for ARABSAT 2B link at C, X, Ku and Ka bands at five locations in Libya. The simulation results of the attenuation at time percentages of an average year ranging from 0.001% up to 1% for five locations of earth stations in Libya are computed at X-band. The attenuation was calculated built on the long-term local data as well as the rainfall rate exceeded for 0.01% of an average year that found from the ITU-R climatic zone map. The simulation results of all cases are compared to rain rate date to identify a suitable rain attenuation to design the reliable satellite communication link based on the location and frequency band.

Microstrip antennas are currently one of the rapid growing antennas in modern telecommunication i... more Microstrip antennas are currently one of the rapid growing antennas in modern telecommunication industry. Research has been carried out in the recent past to improve the efficiency and performance of these patch antennas. The objective of this paper is to design and fabricate a 16 element rectangular microstrip patch array antenna in S-band frequency range. The simulation has been performed utilizing ADS software and the proposed antenna provided a return loss of-21.7 dB at 2.45 GHz and-19.6 dB at 2.54GHz. However, the gain of the antenna is found to be 13dBi. Since the resonant frequency of this antenna ranges from 2.378 to 2.594GHz, which is suitable for S-band applications such as WLAN (802.11b) and WiMAX in Libya.

International Science and Technology Journal, 2021

The utilization of WiMAX technology has led to an increasing number of base stations being built ... more The utilization of WiMAX technology has led to an increasing number of base stations being built in populated regions. Repeated exposure to WiMAX electromagnetic radiation has raised public worry of probable health impacts to individuals in the vicinity of WiMAX Base Stations. The estimation of the power density of the radiation is achievable by knowing the antenna's technical data and the location of the exposed person. In this a paper, Theoretical assessment of power density is performed on areas near WiMAX base stations and compared to the recommendations provided by the International Commission on Non-Ionizing Radiation Protection (ICPNIR).[1] ‫الملخص‬ ‫تقٌُت‬ ‫استخذام‬ ‫أدي‬ ‫هاكس‬ ‫واٌ‬ ‫فٍ‬ ‫بٌاؤها‬ ‫تن‬ ‫التٍ‬ ‫األساسُت‬ ‫الوحطاث‬ ‫ػذد‬ ‫سَادة‬ ‫ئلً‬ ‫بالسكاى‬ ‫الوأهىلت‬ ‫الوٌاطق‬. ‫إلشؼاع‬ ‫الوتكزر‬ ‫التؼزض‬ ‫هاكس‬ ‫واٌ‬ ‫أثار‬ ‫الكهزوهغٌاطُسٍ‬

2013 The International Conference on Technological Advances in Electrical, Electronics and Computer Engineering (TAEECE), 2013

In WiMAX technology: orthogonal Frequency Multiplexing (OFDM) can provide large data rates with s... more In WiMAX technology: orthogonal Frequency Multiplexing (OFDM) can provide large data rates with sufficient robustness to multipath fading. A guard time, in the form of cyclic prefix (CP) is inserted between OFDM symbols to eliminate both the inter-symbol interference (ISI) and the inter-channel interference (ICI). This paper aims to implement a WiMAX system using Simulink of MATLAB. The simulation is used to study the effect of the cyclic prefix on the bit error rate (BER) with different types of modulation techniques (BPSK, 4QAM, 16QAM, and 64QAM) based on the variation in gain vector, delay vector, and signal to noise ratio (SNR). The simulation results of all cases are compared to specified the values of cyclic prefix, gain vector, delay vector, and modulation technique that give the lowest values of BER. Based on these values the performance evaluation of WiMAX communication is done.

At high frequencies, analyzing and designing microwave communication systems demands considering ... more At high frequencies, analyzing and designing microwave communication systems demands considering rain fade. In this paper, the rain fade is evaluated based on the ITU-R P.618-10 rain model for ARABSAT 2B link at C, X, Ku and Ka bands at five locations in Libya. The simulation results of the attenuation at time percentages of an average year ranging from 0.001% up to 1% for five locations of earth stations in Libya are computed at X-band. The attenuation was calculated built on the long-term local data as well as the rainfall rate exceeded for 0.01% of an average year that found from the ITU-R climatic zone map. The simulation results of all cases are compared to rain rate date to identify a suitable rain attenuation to design the reliable satellite communication link based on the location and frequency band.

Microstrip antennas are currently one of the rapid growing antennas in modern telecommunication i... more Microstrip antennas are currently one of the rapid growing antennas in modern telecommunication industry. Research has been carried out in the recent past to improve the efficiency and performance of these patch antennas. The objective of this paper is to design and fabricate a 16 element rectangular microstrip patch array antenna in S-band frequency range. The simulation has been performed utilizing ADS software and the proposed antenna provided a return loss of-21.7 dB at 2.45 GHz and-19.6 dB at 2.54GHz. However, the gain of the antenna is found to be 13dBi. Since the resonant frequency of this antenna ranges from 2.378 to 2.594GHz, which is suitable for S-band applications such as WLAN (802.11b) and WiMAX in Libya.