AEEESJ First Volume, First Issue, free online download
Advanced Electrical and Electronics Engineering and Scientific Journal (AEEESJ)
Meteorological Parameters in Malaysia: An Investigation Between Real Measurements and NASA Database
Mohamed A. Almaktar, Haytham Y. Mahmoud, Elsenoussi Y. Daoud, and Zakariya R. Hasan
Abstract This article investigates the meteorological parameters database for six locations in Peninsula Malaysia (Kuala Lumpur (KL), Johor Bahru (JB), Malacca, Ipoh, Kuantan, and Bayan Lepas) comparing to NASA database. Hourly measurements of global solar radiation, ambient temperature and wind speed were obtained from Malaysia Meteorological Department (MMD) between years 2005-2009. The conducted investigation shows that there is a clear discrepancy between real measurements and satellite-based data provided by NASA. The historical data obtained from MMD can be modeled for predicting weather parameters for other locations in Malaysia and worldwide. The investigation concludes that utilizing real meteorological measurements is more convenient and accurate for predicting the energy output of photovoltaic (PV) systems in the pre-installation phase in terms of feasibility and performance analysis of the system.
Analytic comparison of using FFT and wavelet in IEEE 802.11.a WLAN based OFDM technique
Dr Abdel-Rahman Al-Qawasmi, Majmaah University, IEEE member
Abstract Modulation techniques play a significant role in minimizing the effect of noise produced by noisy channels, especially thermal noise produced due to the heat effect in electronic communication systems. The effect of noise has a significant value in wireless communication systems and can affect the performance of systems and be increasing the probability of error. This increasing of the probability of error will be over some acceptable values due to the me\multiplexing technique used which will force the system to decrease the needed data rate. OFDM meets requirements of high data rates of mobile wireless communications; the OFDM technology is to be an essential technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems. In this paper an investigation into wavelet and Fast Fourier Transform (FFT) and their effect on WLAN IEEE.802.11.a system that implements Orthogonal Frequency Division Multiplexing OFDM analyzed the effect of AWGN using different modulation techniques parameters that simulated to study the performance of the proposed system such as BPSK, DPSK, QPSK, DQPSDK QAM16 and QAM64. Results extracted in simulation part presents a sufficient privilege for DWT-OFDM pair.
Manchester-Coded Minimum Shift Keying (MCMSK)
Ibrahim N. Abu-Isbeih, IEEE Member
Abstract Minimum (frequency) Shift Keying (MSK) is a spectrally efficient modulation scheme compared with other constant envelope modulation schemes. However, its main sidelobe can be of some worry in digital data transmission, particularly over nonlinear channels. Therefore, it is practically of interest to search for pulse shaping schemes, largely proposed through baseband pulse shaping to reduce sideband power, which in turn reduces out-of-band interference between signal carriers in adjacent frequency channels. In this paper a pulse shaping method based on a Manchester coded signaling is proposed to be used in MSK-type signaling. A methodology is proposed for comparing the MCMSK with MSK; and the proposed pulse shaping does not attain improvement in spectral efficiency over straight MSK, for the same channel bandwidth. The fractional out-of-band power and error rate performance are used to compare the behavior of the system under the new proposed technique. The obtained results reveal that the application of Manchester-coded signaling in MSK attains good improvement in symbol synchronization; but the spectral and power efficiencies are less than that of MSK.
Automatic Solar Digital Wireless Irrigation Systems for Open Areas and Green Houses
M. K. Al Enazi, A. A. Alomar, K. I. Alinzi, A. M. Alsaeed
Abstract Nowadays, the water problem becomes an international issue. So, it is a critical step for scientists to use science and new technologies to solve this global problem. While many of them seeking for solutions that based on finding new water recourses, others trying to use different methods for saving water consumption. The lack of water supply in Saudi Arabia and specifically always been the major constraint on agriculture and the determining factor on where cultivation occurred. The aim of this research is to design and implement a complete, reliable wireless irrigation system that has a great advantage in saving time, labour and cost. There are several attempts to use wireless the technology in building an efficient wireless irrigation system. But, these systems suffered from the lack of permanent power supply and the inability to deal with multiple sensing and related multiplexing techniques. The solar and automatic wireless technologies add a complete hand free work for all users. The system fulfills all the farmer needs to get cheaper and better quality products. The system is based on wireless digital technology that can be used for automatic irrigation of different areas. To achieve this purpose, digital multiplexing techniques are used to receive different control signals from different transmitters to control pumps, valves, and other end devices.
Optimisation of Energy Efficiency in MU Buildings using WSAN
Abstract Oil and gas remain the largest sources of the primary energy used for the production of electricity in KSA. Based on data published in , 57% of electricity generation comes from oil and 43% come from gas. These main two resources give total installed power generation capacity about 45000 MW. The consumption of energy (per capita electricity consumption) increases day by day due to different factors like increasing use of energy intensive appliances such as air conditions and ovens and subsidised tariffs. Subsidising the electricity tariffs is also a factor for the intensive use of electricity in the domestic and industrial sectors. The governmental buildings consume about 11% of the total national energy consumption, and 60% of this percentage is lost due to the misuse of the light and air conditions . This loss could be reduced by using a smart system that monitor and control operation of light and air conditions in all administrative buildings. Smart light, smart window, and motion sensors, etc. can be used to increase the energy efficiency of the administrative buildings. Optimisation of energy efficiency in Majmaah University (MU) administrative buildings using a wireless sensor and actuator network (WSAN) is an efficient method for managing the power consumption.