- D E and F Block Auction
- D-AMPS (Digital-Advanced Mobile Phone System)
- DAC (Digital to Analog Converter )
- Data Interface
- Data Service
- dB (deciBel)
- dBc (deciBels referenced to the carrier)
- dBd (deciBels referenced to a dipole antenna)
- dBi (deciBels referenced to an isotropic antenna)
- dBm (deciBels referenced to a milliWatt)
- DCS-1800 (Digital Communication System at 1800 MHz)
- Dead spot
- DECT (Digital European Cordless Telecommunications)
- Dedicated Control Channel (DCCH)
- Dedicated Line
- Delay spread
- Demodulation
- DEMS (Digital Electronic Message Service)
- Deregulation
- Descrambler
- Device Under Test (DUT )
- Dial access to paging
- Dial tone
- Differential detection
- Diffraction
- Digital
- Digital Audio Broadcasting (DAB)
- Digital bit stream
- Digital channel
- Digital modulation
- Digital multiplexing
- Digital Phase Modulation (DPM)
- Digital signal
- Digital signal processor
- Digital signature
- Digital speech interpolation (DSI)
- Digital Switch
- Digital switching
- Digital Technology
- Digital Television (DTV)
- Direct Broadcast Satellite (DBS)
- Direct Current Power Amplifier (DCPA)
- Direct Current Transceiver and Processor Unit (DCTPU)
- Direct Inward Dialing (DID)
- Direct Outward Dialing (DOD)
- Direct Sequence (DS)
- Direct Sequence Spread Spectrum (DSSS)
- Disaggregation
- DISCO II
- Disconnect
- Discontinuous Transmission (DTX)
- Dispersive channel
- Distant signal
- Distortion
- Distributed processing
- Distributor
- Divestiture
- DK40
- Donor Site
- Doppler shift/Doppler effect
- Downlink
- Downtime
- DQPSK (Differential Quadrature Phase Shift Keying)
- Drive test
- Driver distraction
- Dual band
- Dual mode
- Dual-Tone Multi frequency (DTMF)
- Dulex RF channel
- Duplex/full duplex
- Dynamic Channel Allocation (DCA)
- Dynamic Channel Multicarrier Architecture (DCMA)
- Dynamic coverage control
D
