The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
One of the aims of communication is to increase the data rate. However, frequency resources are scare and valuable for wireless communication systems. How to use frequency resources efficiently is a significant area which needs the attentions of researchers. Ultra Narrow Band (UNB) has attracted wide attentions since it was proposed. M-ary Position Phase Shift Keying (MPPSK) is one of the UNB modulation...
This paper presents a comprehensive approach to evaluate tie line operation control and stiffness for Sudan and Ethiopia networks. Tie line operation control evaluate by the frequency and area control error deviation from Sudan Stander, The work has been supported by on line measurement made for frequency deviation and area control error in the tie line.
Single electron circuits are proposed for use as a coherent signal source. This paper uses the Monte-Carlo method to investigate the degree of correlation between successive events in long arrays of tunnel junctions. Simulations use ensemble studies starting from a known condition used to compute the probability density functions for time between events. It is shown that longer arrays produce more...
Several techniques have been investigated in this paper to propose the reduction of phase noise due to electro-magnetic interference for inductor based ultra-wide band voltage controlled oscillator (VCO). Furthermore, figure of merit of VCO and its tuning range have been compared to exhibit the improved performance. According to article, phase noise has been stated as −151 dBc/Hz at 20 MHz offset...
One of the essential divisions of the fast developing field of vehicular technology is the vehicle to infrastructure (V2I) communications. The PHY layer of V2I is implemented by the IEEE 802.11p wireless standard, whose core is the Orthogonal Frequency Division Multiplexing (OFDM) due to its robustness against multipath fading. The recently developed technique called OFDM with Index Modulation (-IM)...
Digital audio compression is applied to reduce the data rate required to send audio stream through band limited communication networks, as well as reducing the size of data storage in case of recording audio streams. It is common to apply lossy audio compression algorithms in many applications, which provide higher compression at the expense of the fidelity. MPEG-1&2 Audio Layer III, or MP3, is...
Operational amplifiers have been used for interfacing analog signals to microcontrollers units. Due to its random nature, analog signals vary very much, perhaps then exceed the voltage ranges of operation. Chip manufacturers protect their chips by using diode circuits, but those diodes are not intended to normal use. To overcome the signals which may exceed the limit, clamping circuit have been used...
the complexity of sphere detection algorithm is high when the Signal to Noise Ratio (SNR) is low. For this problem, a new type of detection algorithm of sphere decoder is proposed. The new algorithm reduces the radius of sphere when the SNR is low by using the Minimum Mean Square Error (MMSE) algorithm and a compressibility factor. With the result of simulation, It shows that when the SNR is less...
The essential mission requirement of a satellite is the ability to provide a link to transmit information to and from the ground station. In general the communication system of the cube satellite is divided into two subsystems which are telemetry and data subsystem, and beacon subsystem. The telemetry and data subsystem will ensure continuous communication with the ground station. The beacon subsystem...
The On-Board computer (OBC) in CubeSat is the subsystem which acts as a bridge that connects the other subsystems with each other. It supervises many of the tasks that are done by the different subsystems of satellite and performs housekeeping and monitoring to ensure the health and status of those subsystems. The hardware and software design of the OBC mainly depends on the mission of the CubeSat...
In brachytherapy treatment of cancer, multiple radioactive seeds are implanted inside the cancer tumor by a surgical needle, and the locations of the seeds are dependent on the accurate placement of the needle at desired position inside the patient body. Therefore, needle placement is very important for the effectiveness of brachytherapy treatment. In this work, we propose design of Fuzzy-PID control...
The need for efficient public transportation system such as buses is rapidly increased due to the increasing in population, the passengers need to know the accurate arrival time of the particular bus to particular station and then plan their journey from their home. Fuel monitoring have been the major problem that most of bus companies looking to solve. This paper developed a bus tracking and monitoring...
In the recent years', image processing is becoming an important field in computer science. Also, interaction between human and computer is in increasing rate. Nowadays image processing used in many application for example application like measuring the distance between systems that consist of a camera and objects around the system using Stereo vision. Some previous studies use pixel by pixel search...
This paper implemented the web-based GIS Hotels Business Tourism Site in Khartoum state. The motivation as well as the problem statement is the lack of spatial data and geographical informations of Business Hotels tourism in Khartoum state, hence, lead to the unavailability of web based Business Hotels tourism, also the lack of research papers in this field. One of important goal is the way of supporting...
Fourth Generation (4G) systems are expected to operate the global mobile network coverage area. They provide various services for different user types and their requirements. Vertical handovers occur between two layers of cells when a user is switched from one layer to the other. This paper details the influence of network parameters on vertical handover performance in a cell by simulating an overlapped...
Direct identification and subsequent replacement of faulty components in electronic circuits reduces the overall maintenance costs and time-to-repair the items. In this paper, a tool that can identify the faulty component in any position in the circuit has been designed, simulated and implemented. Device software use wavelet transform algorithm to recognize the signature of the faulty component. The...
During an embedded system software development, the process of upgrading and downloading the software to the system hardware is fairly easy, because the platform is not encapsulated on its final production form yet. Hence, when the product is ready to be shipped to the end user, an ISP (in-system programming) to upgrade software is needed to add a new feature or to fix a bug. A certain microcontroller...
In many industries (such as pharmaceuticals, beverage industries, etc.), bottles are required to be filled up with a pre-determined amount of liquid. Implementing systems using relay logic control can cause them to be inflexible. Programmable Logic Controllers - PLCs - are more flexible in automating various processes, since the behavior of the system can be changed without changing the electrical...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.