Masters Theses

Teong Poh Teh

Date of Award

5-1993

Degree Type

Thesis

Degree Name

Master of Science

Major

Electrical Engineering

Major Professor

Daniel B. Koch

Committee Members

Paul B. Crilly, J. W. Waller

Abstract

Indoor wired communication systems suffer from problems such as high installation, relocation, and maintenance costs. Given the expense and limitation of wired systems, wireless systems which provide cost efficiency and terminal portability become the best alternative for users. Because wireless systems always operate over a band limited channel with a rapidly changing environment, issues such as man-made noise, frequency bands, multiple access schemes, and radio wave propagation characteristics, are always taken into consideration. Most indoor wireless systems are implemented using radio frequencies (RF) and infrared (IR). IR is suitable for limited range and low data rate applications while RF is preferred for longer range and both low and high data rate applications. A indoor wireless communication system was developed whereby two Macintosh llx computers were able to communicate with each other by using a radio links. The communication program, which is based on the AX.25 protocol, is written in the graphic programming language called Lab VIEW. The hardware, which consists of a 1200 baud packet modem, a 49.7 MHz FM transmitter, and a 49.7 MHz FM receiver, was implemented and used to transmit and receive binary data. The measurement of system performance was performed by calculating the number of error packets received. The average probability of bit error of the system is about 1.027E-8 which is determined experimentally from the observed probability of packet error.

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