Nobody in this world wants to be held hostage in a traffic jam for hours and hours. The need to have efficient traffic flow in our roads cannot be overemphasized. It is in this understanding that this paper delves into the study and implementation of a suitable algorithm for traffic routing. The implementation is based on graph theory, where a road network map is first converted to a graph with nodes and edges where the edges represent the roads and the nodes represent the various road intersections. The roads are given various weights depending on their distance and traffic density, and the time a motorist would take to move from one point to another is estimated. A suitable routing algorithm, which in this case is the Dijkstra’s algorithm is applied on the weighted graph.

This paper focuses on designing a circuit that rectifies background radiation and one that is self-biasing. This circuit set-up is called a rectenna which is a special type of antenna that is used to convert radio-frequency energy into direct current electricity. A simple model of a rectenna element consists of a monopole antenna with an radio frequency(RF) diode bridge connected in series with the antenna. The bridge rectifies the ac current induced in the antenna by the electromagnetic radiation to produce dc power which is used to bias a Bipolar Junction transistor(BJT). RF sensitive/high switching diodes are usually used because they have the lowest voltage drop and highest speed and therefore have the lowest power losses due to conduction and switching. The BJT transistor has a feedback biasing and essentially amplifies the ac signal from the antenna. The amplified signal is fed into an RF diode for dc conversion. There are two stages of amplification in order to achieve a big voltage magnitude at the output that can be used to charge a device with low power ratings. Thus the idea of a cell-less power source is achieved in such implementation.

This paper implores the parallelization of Fast Fourier Transform (FFT) algorithms and evaluates the resultant parallelized source codes. The FFT algorithm is considered to be among the most important algorithms in the digital era. There are various FFT algorithms but just a few are considered in this paper. The Cooley-Tukey FFT is the most widely known and used. With no exception, in this paper, the radix-2 Decimation in Time (DIT) and Decimation in Frequency (DIF) are studied and implemented. Another important FFT algorithm that is the Goertzel is also considered in this paper.

This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM

This paper studies the performance of coded orthogonal frequency division multiplexing system using two modulation techniques, quadrature phase shift keying(QPSK) and quadrature amplitude modulation(QAM). The convolutional code is used as error-correcting-code. The communication channel used is vehicular channel. Simulation results show that the performance of coded orthogonal frequency division multiplexing system with QPSK is better than that with QAM