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PA power amplifier
PAA phased-array antenna
PABX private automatic branch exchange
PAC perceptual audio coder
PACS personal access communications system (US version of PHS)
pACT personal air communications technology
PAE power-added efficiency
PAL programmable array logic
PAL phase-alternation line (video)
PAM pulse amplitude modulation
PAMR Public Access Mobile Radio
PAN public access network
PAPR peak-to-average power ratio
PAR peak-to-average ratio
PBG photonic band-gap
PBX private branch exchange
PCI peripheral component interconnect (bus)
PCIA Personal Communication Industry Association
PCM pulse code modulation
PCM process control monitor
PCMCIA Personal Computer Memory Card International Association
PCN personal communications network
PCS personal communication service
PCU power conditioning unit
PD predistortion
PD pulsed Doppler
PDA personal digital assistant (portable computing)
PDC personal digital cellular
PDF probability distribution function
PDH plesiochronous-digital hierarchy
PDIP plastic dual-in-line package
PDO packet data optimized
PDR polarization discrimination ratio
PDS power density spectrum
PEBB power electronic building blocks
PEC perfect electrical conducting
PECL positive/pseudo emitter-coupled logic
PECVD plasma-enhanced chemical vapor deposition
PEEC partial element equivalent circuit
PEI phase equal insertable
PEM plastic encapsulated microcircuits
PEP primary entry point
PEP peak envelope power
PER packet error rate
PFD phase/frequency discriminator
PHEMT pseudomorphic high electron mobility transistor
PHP personal handyphone, JPHP (Japan,1895.15-1905.15 MHz)
PHS personal handyphone system (Japan)
PHY physical layer (WLAN)
PIC photonic integrated circuit
PIC programmable integrated circuit
PIFA planar inverted-F antenna
PIM passive intermodulation
PIN positive-intrinsic-negative (diode junction)
PLCC plastic leaded chip carrier (molded plastic)
PLD programmable logic device
PLD pulsed laser deposition
PLF polarization loss factor
PLL phase-locked loop
PLMN private land mobile network
PM phase modulation
PM polarization-maintaining (optical fiber)
PMC perfect magnetic conducting
PMD polarization mode dispersion
PML perfectly matched layer
PMOS positive metal oxide semiconductor
PMR Private Mobile Radio
PN pseudorandom noise
PNF planar near-field (range)
PON passive optical network
POCSAG Post Office Code Standardization Advisory Group (paging)
POF plastic optical fiber
POFS private operational fixed service
POS Post Office Protocol
POTS plain old telephone service
PPM periodic permanent magnet (focused)
PPM pulse position modulation
PPS precise positioning service (GPS)
PPV perturbation projection vector
PQFP plastic quad flat pack
PR pseudorange
PRBS pseudorandom binary or bit sequence
PRF pulse repetition frequency
PRN pseudorandom noise
PROM programmable read-only memory
PRT planar resistor technology
PSA polysilicon self-aligned (bipolar transistor)
PSD power spectral density
PSK phase shift keying
PSMM pilot strength measurement message
PSTN public switched telephone network
PTFE polytetrafluoroethylene
PTH plated-through hole
PTMA planar printed triangular monopole antenna
PTO public telecommunications operator
PTT post, telephone and telegraph (Europe)
PWM pulse width modulation
P1dB power 1 dB compression point