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3 Poznan University of Technology Academic Journals. Electrical Engineering

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Propagation prediction for indoor wireless local area network application

Sharoun A. O., Artimei E. E.

Poznan University of Technology Academic Journals. Electrical Engineering

2015

No. 84

85--91

The application of wireless local area network (WLAN) is increasing in offices, it becomes important to study signal propagation indoor environment. In this Paper, the Site Ware Technologies` site specific propagation prediction tool is a Three-dimensional (3-D) ray tracing code employing modified shoot and bounce Ray (SBR) method known as the Vertical Plane Launch (VPL) is used to predict indoor propagation effects in a cultural Center. The simulation experiment is carried out to select the best location for installing a transmitter in a large center with many rooms and corridors. Receivers should available in all of the rooms. To understand how electromagnetic waves reach the receiver, visualization software was used based on Matlab. This type of simulation will save money by selecting the minimum power of a single transmitter and choosing the least number of transmitters in large buildings.

Voice over IP and network convergence

Sharoun A. O.

Poznan University of Technology Academic Journals. Electrical Engineering

2014

No. 80

239--243

As the IP network was primarily designed to carry data, it does not provide real-time guarantees but only provides best effort service, which is inadequate for voice communication. Upper layer protocols were designed to provide such guarantees. Further, as there are several vendors in the market implementing these protocols, conformance to standards and interoperability issues have become important with general VoIP (Voice over Internet Protocol) description noting VoIP advantages, disadvantages, problems with reliability and security.

Residue number system (RNS)

Sharoun A. O.

Poznan University of Technology Academic Journals. Electrical Engineering

2013

No. 76

265--270

In the residue number system, a set of moduli which are independent of each other is given. An integer is represented by the residue of each modulus and the arithmetic operations are based on the residues individually. The arithmetic operations based on residue number system can be performed on various moduli independently to avoid the carry in addition, subtraction and multiplication, which is usually time consuming. However, the comparison and division are more complicated and the fraction number computation is immatured. Due to this, a residue number system is not yet popular in general-purpose computers, though it is extremely useful for digital-signal-processing applications. This thesis deals with the design, simulation and microcontroller implementation of some (residue number system based) building blocks for applications in the field of digital signal processing. The building blocks which have been studied are binary to residue converter, residue to binary converter, residue adder and residue multiplier.