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What is Frequency-Hopping Spread Spectrum

Chapter 16
Handbook of Research on Personal Autonomy Technologies and Disability Informatics
FHSS is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels. In order to synchronize the transmitter and the receiver a pseudorandom sequence known by both is used. Bluetooth has been designed to operate in noisy radio frequency environments. That noise produces interferences in the system, being allocated in some random frequencies. By switching among frequencies the impact of noise results highly decreased.
Published in Chapter:
Wireless Sensor Networks and Systems
Jaime Lloret (Polytechnic University of Valencia, Spain), Miguel Garcia (Polytechnic University of Valencia, Spain), Hugo Coll (Polytechnic University of Valencia, Spain), and Miguel Edo (Polytechnic University of Valencia, Spain)
Copyright: © 2011 |Pages: 13
DOI: 10.4018/978-1-60566-206-0.ch016
Abstract
Sensor networks are one of the most powerful technologies applied to control and supervising systems. They are present in almost all environments, so we can find them in different industrial, medical, security and/or home applications. In addition, the use of wireless technologies applied to sensor networks improves the final system. Examples given are the enlargement of the coverage area and the low deployment costs. Nowadays a combination of both items is used in many common implementations of a wide variety of applications. This chapter is focused on the use of sensor networks applied to disabled and elderly people. We will study the wireless technologies most used for this purpose and we will show a survey with the benefits when they are applied.
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