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Mhnd Farhan

Abstract

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

Open access

Mhnd Farhan

Abstract

This paper presents a system that employs the use of speech technology to control electronic devices attached to PC. The work in this paper is implemented in two major phases. Phase one is the software part of the system. Its role is to accept voice signal from a microphone attached to the PC and perform speech recognition on the signal, determine operating commands from the recognized phrases and control devices attached to the computer ports. Phase two is hardware logic circuit connected between the PC’s printer port and the devices being controlled. This logic circuit which is implemented using simple logic gates performs addressing and control mode for the electronic devices being controlled. The system runs on windows vista operating system and it is capable of authenticating users and validating their action. User response for the system is provided in both voice response and graphic display messages.