Monday, December 31

Acronyms Related to Wireless Sensor Network

ACK Acknowledgement Packet or transmission got through OK
ACL Access Control List  
AM Amplitude Modulation  
AP Access Point  
ARQ Automatic Repeat reQuest Sometimes called link level ACK or L2 ACK
ASK Amplitude Shift Keying A form of AM communication
BER Bit Error Rate  
CDMA Code Division Multiple Access  
CMOS Complementary Metal Oxide Semiconductor The standard family of processes used to manufacture integrated circuits.
CSMA Carrier (or Channel) Sense Multiple Access The channel is sensed before transmission is initiated. If the channel is busy, transmission is delayed. In some cases (e.g. Ethernet) the channel can be sensed during communication as well, in which case collisions can be detected (CSMA-CD). In wireless this is generally not possible, and only a subset of collisions can be avoided (CSMA-CA).
dB decibel One tenth of a Bell. 1 Bell = a factor of 10 in power.
dBm deciBels relative to a milliWatt 1 Bell is an order of magnitude in power, so 10 deciBels relative to a milliWatt is 10mW. -10 dBm = 0.1mW. -90dBm = 1 picoWatt
ESA Electrically Small Antenna Any antenna for which 2pa/l < 1, where 2a is the maximum dimension of the antenna.
FEC Forward Error Correction  
FER Frame Error Rate  
FM Frequency Modulation  
FSK Frequency Shift Keying A form of FM communication
IETF Internet Engineering Task Force The organization that defines all of the internet protocols like IP, TCP, http, ftp, (www.ietf.org)
ITU International Telecommunications Union Major standards body
MAC Medium Access or Medium Access Control The Medium Access Layer is a sub-layer of the Data Link Layer, layer 2
MAC Message Authentication Code In wireless communications this is usually called a MIC to avoid confusion with the Medium Access layer.
MIC Message Integrity Code  
NACK Negative ACK Packet or transmission did not get through OK.
NET Network layer  
OOK On Off Keying A form of AM communication
OQPSK Offset QPSK RF modulation used by 802.15.4 in the 2.4GHz band
OSI Open System Interconnection A 7 layer model for representing the hierarchy of communication systems. Generally given as: application, presentation, session, transport, network, data link, physical
PDR Packet Delivery Rate (or Ratio) The fraction of packets that make it through a single hop with no errors.
PDU Protocol Data Units Data exchanged between layers in an OSI stack.
PER Packet Error Rate  
PHY Physical layer  
PM Phase Modulation  
PSDU Physical layer Service Data Unit  
PSK Phase Shift Keying A type of RF modulation, contrast AM and FM
QPSK Quadrature PSK  
RF Radio Frequency  
RSSI Received Signal Strength Indicator RSSI is a measure of how much power was received by the radio. Usually this is during reception of a packet, but sometimes just sampling the noise on the channel. RSSI is usually measured in dBm
TDMA Time Division Multiple Access  
TDOA Time Difference of Arrival Used in RF location systems
TOF Time of Flight  
TSMP Time Synchronized Mesh Protocol  
WSN Wireless Sensor Networks  

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