Multiple access radio communications in the factory environment
Abstract
In order to provide reliable data communication services to a large number of users in a manufacturing environment the problems of Channel Modeling for factory multipath channels and multiple access signalling techniques have been addressed. In the factory environment there are many paths between the transmitter and receiver due to the many spatially separated, metallic reflecting surfaces present. In some situations the receiver may be moving relative to the transmitter causing the channel to be time-varying. A mathematical model based on experimental factory multipath channel data has been developed that is suitable for predicting the performance of factory radio communication systems. a Frequency-Hopped, M-ary, Frequency Shift Keyed (FH-MFSK) spread spectrum communication system is proposed and is investigated analytically and through simulation to determine its performance in the factory environment. In this system each user is assigned a different coded sequence as his address which permits many users to share the same communication frequency band simultaneously. The use of frequency hopping provides robust performance in the frequency selective fading environment of the factory. The number of simultaneous users for specified bit error rates has been computed for various system parameters such as number of hopped frequencies, signal-to-noise ratio and level of coding and shows excellent performance in this environment.
Degree
Ph.D.
Advisors
McGillem, Purdue University.
Subject Area
Electrical engineering
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