U字彙

U.I.R (Union Interationale de la Radiodiffusion)
U.S. Department of Defense
U/C (Up/Converter)
U/N (User/Network)
UART
UDR (UNITDATA Received)
UHF communication antenna
UHF/DF (Ultra-High-Frequency Direction Finding)
UHFF (Ultra-High-Frequency Filter)
UHFG (Ultra-High-Frequcny Generator)
UHFO (Ultra-High-Frequency Oscillator)
UHFR (Ultra-High-Frequency Receiver)
UIT (Union Internationale des Telecommunications)
ultrahigh frequency (UHF)
ultraviolet， intrinsic absorption of
UMSPE (User Meta-signaling Protocol Entity)
UMW (Ultra Micro Waves)
Unassured Data Transfer
UNBAL (unbalanced)
unconfirmed service
underdamping
underfill
underground plant
underspread
undetectable error patterns
unfocused synthetic array
UNI (User-Network Interface0
unidirectional
union bound
uniple biconical natenna
universe ntewtok
UNIX networking
unlinks， multiple
unload time
unloaded Q
unmanned earth station
unmasking effects
unpredictability
unsolicited message
unvoiced speech
up-conversion
UPI (Union Postale Internationale)
upsampler
upsmapling filter
upward multiplexing
URSI (Union Radio-Scientifique Internationale)
USAF(S) (United States Air Force (Satellite))
USB (Upper SideBand)
USR (User-To-User Information Message)
USRT
USW (U.S.W) (ultrashort wave)
UU (User to User)
uucp program
UV (Ultra Violet)
UW (Ultrasonic Wave)

Ultra High Frequency{=UHF}
Ultra-Low Frequency{=ULF}
ultra-low-loss fiber

ultraviolet (uv) fluorescence
ultraviolet absorption

un-converter
un-link (earth-to-space link)

unambiguous Doppler
unambiguous range
unambiguous velocity

unbalanced configuration
unbalanced line
unbalanced mixer
unbalanced mode
Unbalanced Normal Response (UNR) mode

undersea cable
undersea cable attenuation
undersea cable transmission systems

unguided mode
unguided system
unguided transmission media

uniform aperture distribution
uniform convolutional code
uniform distribution
uniform illumination
uniform linear array
uniform plane wave
uniform quantization
uniform wave

unipolar line encoding
unipolar modulation
unipolar signal
unipolar video

unique code (CDMA)
unique word

uniqueness
uniqueness theorem

unit
unit circle
unit circle of array
unit delay predictor
unit element
unit generator， acknowledgement signal
unit impulse function
unit step sequence

universal constant
universal data type
universal pattern
Universal Time (UT)

unnumbered frame
Unnumbered Information (UI) command/response
Unnumbered Poll (UP) command

upper and lower bounds
upper frequency limit
upper sideband

UPS (Uninterruptable Power System)
UPS (User Proving State)

Usage
Usage Parameter Control{=UPC}

user agent
User Datagram Protocol (UDP)
user element
user facilities servie
User Meta-signaling Protocol Entity
User Part
user profile
User Service Information
User Teleservice Information
User-Network Interface
User-to-User Indicators
User-to-User Information
User-to-User Information Message
User-to-User Service
User-to-User Signaling

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