2G — second generation of wireless communications systems
3G — third generation
A/D — analog-to-digital
AC — alternating current
ACPR — adjacent — channel power ratio
ADC — analog — to — digital converter
AGC — automatic gain control
AMPS — advanced mobile phone system
AODV — ad-hoc on demand distance vector
ASIC — application — specific integrated circuit
ASK — amplifier shift keying
ASP — application service provider
ATM — asynchronous transfer mode
AWGN — additive white gaussian noise
BPSK — binary phase shift keying
CCRR — co — channel rejection ratio
CDMA — code — division multiple access
CDPD — cellular digital packet data
CGI — common gateway interface
CMOS — complementary metal-oxide semiconductor
CMRR — common-mode rejection ratio
CW — continuous wave
DC — direct current
DCS — distributed communications system or digital cellular system
DDS — direct digital synthesis
DECT — digital european cordless telephone
DSP — digital signal processor
DUT — device under test
EEPROM — electrically erasable programmable read-only memory
EM — electromagnetic
EMC — electromagnetic compatibility
EMI — electromagnetic interference
ESD — electrostatic discharge
ETSI : european telecommunications standards institute
FCC — federal communications commission
FDD — frequency division duplex
FEM — finite-element method
FET — field-effect transistor
FHSS — frequency-hopping, spread spectrum
FIFO — first-in, first-out
FIR — finite impulse response
FSK — frequency shift keying
GaAs — gallium arsenide
GaN — gallium nitride
GFSK — gaussian filtered frequency shift keying
GMSK — gaussian minimum shift keying
GPIB — general-purpose interface bus
GPRS — general packet radio service
GPS — global positioning system
GSM — global system for mobile communications
HBT — heterojunction bipolar transistor
HDR — high data rate
HEMT — high electron mobility transistor
HSCSD — high — speed circuit-switched data
HTTP — hypertext transfer protocol
I and Q — in — phase and quadrature
I/O — input/output
IC — integrated circuit
IF — intermediate frequency
IM — intermodulation
IMD — intermodulation distortion
InP — indium phosphide
IP — internet protocol
IR — infrared
ISM — industrial, scientific, and medical
JSP — java server pages
LAN — local area network
LDMOS — laterally diffused metal oxide silicon
LMDS — local multipoint distribution service
LNA — low — noise amplifier
LO — local oscillator
LOS — line of sight
LPF — low — pass filter
LSI — large scale integration
LTCC — low — temperature co — fired ceramic
MDS — multipoint distribution systems
MMAC — million multiply accumulate operations
MMDS — multichannel multipoint distribution service
MMIC — monolithic microwave integrated circuit
MOSFET — metal — oxide semiconductor field — effect transistor
MOU — minutes of use
MSPS — million samples per second
NRZ — non — return to zero
NTC — negative temperature coefficient
OEM — original equipment manufacturer
PA — power amplifier
PAR — peak-to-average ratio
PCB — printed circuit board
PCS — personal communications system
PDA — personal digital assistant
PDC — pacific digital cellular
PECL — positive emitter-coupled logic
PHEMT — pseudomorphic high-electron-mobility transistor
PIM — personal information management
PLL — phase — locked loop
PPM — parts per million
PSK — phase shift keying
QPSK — quadrature phase shift keying
RFI — radio frequency interference
RFIC — radio frequency integrated circuit
ROM — read — only memory
SDH — synchronous digital hierarchy
SMA — standardization management activity
SMD — short message delivery
SMR — specialized mobile radio
SMS — short messaging service
SMT — surface — mount technology or surface — mount toroidal
SNR — signal — to — noise ratio
SOIC — small-outline integrated circuit
SONET — synchronous optical network
SPDT — single — pole double — throw
SSPA — solid state power amplifiers
TCP — transmission control protocol
TDD — time division duplex
TDMA — time — division multiple access
TETRA — trans european trunked radio
TTL — transistor — transistor logic
TXCO — temperature — compensated crystal oscillator
UART — universal asynchronous receiver transmitter
UDP — user datagram protocol
UMTS — universal mobile telecommunications service
UTRA — UMTS terrestrial radio access
VCO — voltage-controlled oscillator
VCXO — voltage — controlled crystal oscillator
VOFDM — vector orthogonal frequency division multiplexing
VSAT — very small aperture terminal (satellite service)
VSWR — voltage standing wave ratio
WAP — wireless application protocol
W — CDMA — wideband code — division multiple access
WLAN — wireless local area network
XDSL — another name for an ISDN BRI channel