Glossary (this page best printed
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Bluetooth
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A
royalty-free technology specification for short-range wireless
communication among devices. It defines a wireless radio frequency
communication interface and associated sets of communication protocols
and application profiles. The Bluetooth specification defines 79
channels spaced 1 MHz apart in the 2.4 GHz industrial, scientific, and
medical (ISM) radio band. The protocol uses a
frequency-hopping spread spectrum technique, where the radio hops
through the 79 channels in a pseudo-random sequence at a rate of 1600
hops per second. Intended to provide a universal standard for
connecting a broad set of wireless devices.
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http://grouper.ieee.org/groups/802/15/pub/2001/May01/
Misc/IEEEBostonADI_BluetoothMinicourse_Week1.ppt
http://www.bluetooth.com/
http://www.bluetooth.org/specifications.htm
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Data
acquisition system
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A
system for detecting and quantifying measurements, often of physical
conditions, for subsequent transmission, processing, or storage. Data
acquisition systems (DAS) usually consist of sensors (transducers),
signal conditioners, and other data acquisition hardware and software.
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DSSS
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Direct
sequence spread spectrum. DSSS multiplies the data stream by a
pseudo-random sequence known as psuedonoise (PN). The result is a
data signal that has been spread across a wider frequency spectrum, so
to an unintended receiver, it appears as low-power wideband noise
and is ignored. The intended receiver knows the PN sequence and
de-spreads the signal, extracting the original data stream.
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http://murray.newcastle.edu.au/users/staff/eemf/ELEC351/
SProjects/Morris/project.htm
http://sssmag.com/ss.html
http://cas.et.tudelft.nl/~glas/ssc/techn/techniques.html
http://www.metricsystems.com/technology.html
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EIA
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Electronic
Industries Alliance
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http://www.eia.org/ |
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Ethernet
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A
specific LAN architecture, commonly used for connecting personal
computers and workstations. It is defined in IEEE Standard 802.3.
Originally Ethernet supported data transfer up to 10 Mbps. The
newer extended version supports transfer up to 100 Mbps.
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FHSS
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Frequency
hopping spread spectrum. FHSS is a transmission technology that
uses a narrowband carrier signal that changes frequency
(hops) in a random but predictable pattern as a function of time over a
band of frequencies that is known by both the transmitter and receiver.
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http://murray.newcastle.edu.au/users/staff/eemf/
ELEC351/SProjects/Morris/project.htm
http://sssmag.com/ss.html
http://cas.et.tudelft.nl/~glas/ssc/techn/techniques.html
http://www.metricsystems.com/technology.html
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IEEE
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Institute
of Electrical and Electronics Engineers
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http://www.ieee.org/portal/index.jsp
http://standards.ieee.org/wireless/
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IEEE
802.11b
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Standard
IEEE 802.11b (IEEE 1999) is an extension to 802.11 covering wireless
LANs transmitting at up to 11 Mbps in the 2.4 GHz band. The 802.11b
extension requires use of DSSS to achieve this higher data throughput.
DSSS adds a pseudo-random numerical (PN) sequence to each information
bit before transmission.
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http://grouper.ieee.org/groups/802/11/
http://grouper.ieee.org/groups/802/11/main.html
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ISM
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Industrial,
scientific and medical radio band. Portion of the radio-frequency
spectrum allocated by regulatory agencies (e.g., the FCC in the United
States) and international agreements to local use for industrial,
scientific, medical, domestic and other similar applications, excluding
telecommunications.
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http://www.tscm.com/47cfr18.pdf
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LAN
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Local
area network. A computer communications network that spans a
relatively small area, such as a single building.
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Mbps
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Mega
bits per second
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Piconet
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Small
ad hoc nets of up to 8 devices defined by the Bluetooth specification.
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http://www.cconvergence.com/article/CTM20010529S0002
http://www.logophilia.com/WordSpy/piconet.asp
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Point-to-multi-point
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Wireless
communication system in which many transmitters can transmit data to a
single receiver.
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Point-to-point
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Wireless
communication system in which each transmitter is paired with a
receiver.
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RF
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Radio
frequency
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RS-232
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The
EIA standard for connecting serial devices.
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http://www.camiresearch.com/Data_Com_Basics/
RS232_standard.html
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RS-485
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The
EIA standard for multi-point communication.
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http://www.arcelect.com/485info.htm
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Serial
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Data
transfer where transmission occurs one bit at a time in sequence.
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Serial
devices
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Devices
that use serial communication.
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Signal
conditioner
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An
electronic unit that improves the quality of the signal from a
transducer (sensor). It may provide: amplification,
filtering, and/or linearization.
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Transducer
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A
device (or sensor) that converts a physical condition (non-electrical
signal) to an electrical signal.
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WDAS
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Wireless
data acquisition system
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