| PA: Power Amplifier |
Power Amplifier (PA) is a device for taking a low or intermediate-level signal and significantly boosting its power level. A power amplifier is usually the final stage of amplification in a transmitter.
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| Packet Radio |
Packet radio is a form of digital data transmission used in amateur radio to construct wireless computer networks. Its name is a reference to the use of packet switching between network nodes, which allows multiple virtual circuits to coexist on a single radio channel. Packet radio networks use the AX.25 data link layer protocol, derived from the X.25 protocol suite and designed for amateur radio use.
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| PACS: Personal Access Communications Sys |
Personal Access Communications System (PACS) is a low mobility low power wireless system designed for residential use.
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| Paging |
Paging refers to deliver a message to someone when their location is unknown through a wireless device usually known as a pager.
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| PAM: Pulse Amplitude Modulation |
Pulse Amplitude Modulation (PAM) is a form of signal modulation in which the data is encoded in the amplitude of a series, or train, of regularly recurrent signal pulses. PAM is used less frequently than PCM (Pulse-Code Modulation).
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| PAN: Personal Area Network |
A personal area network (PAN) is a computer network used for communications among computer devices (including telephones and personal digital assistants) close to one person within a few meters. PAN allows devices to work together and share information and services. Using Bluetooth wireless technology, Personal Area Networks can be created in public places, in your home, in your office, and even in your car. This network enables everyday devices to become smart, tetherless devices--working and communicating together. For example, it offers the ability to wirelessly synchronize with your desktop to access your e-mail and Internet/intranet from remote locations.
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| Panel Antenna |
Panel Antenna is an antenna type that radiates in only a specific direction. Panel antennas are commonly used for point-to-point situations. You may also see them called "patch antennas."
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| Parabolic Antenna |
Parabolic Antenna is an antenna type that radiates a very narrow beam in a specific direction. Parabolic antennas offer the highest gain for long-range point-to-point situations.
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| Paring |
Paring is the process of engaging two Bluetooth devices to each other so they can communicate.
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| Parity |
Parity is a simple error detection scheme. The method usually involves counting the '1' bits in a codeword and then setting an additional bit to either '1' or '0' depending on whether the original number of '1' bits was even or odd.
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| Partial Response Signalling |
Partial Response Signalling is a signalling technique in which a controlled amount of intersymbol interference is introduced at the transmitter to shape the transmitted spectrum.
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| Passphrase |
Passphrase, also called password, is the words you must enter to authenticate both sides of the connection when pairing Bluetooth devices. More generically, you may see passphrase used in place of "password" to indicate that you can enter more than a single word.
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| Path loss |
Path loss is the amount of loss introduced by the propagation environment between a transmitter and receiver. Power loss that occurs when RF waves are transmitted through the air. This loss occurs because the atmosphere provides a filtering effect to the signal. Certain electromagnetic frequencies (very high and non-commercial) are completely blocked or filtered by the atmosphere.
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| PCH: Paging Channel |
Paging Channel (PCH), used primarily to notify the mobile that it has an incoming call, is a logical channel in GSM, cdma2000, and W-CDMA systems used to send messages to mobile station.
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| PCIA: Personal Communications Industry A |
Personal Communications Industry Association (PCIA) is a trade group representing PCS, SMR, private radio and other wireless users and carriers.
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| PCM: Pulse Code Modulation |
Pulse Code Modulation (PCM) is the most predominant type of digital modulation in use today. PCM performs an analog to digital conversion of the speech waveform through a sampling process and encodes and transmits the samples in a serial bit stream as 8-bit digital words.
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| PCN: Personal Communications Network |
Personal Communications Network (PCN) is a standard for digital mobile phone transmissions operating at a frequency of 1800 MHz (also referred to as GSM 1800). It is used in Europe and Asia Pacific.
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| PCS: Personal Communication Service |
Personal Communication Service (PCS) describes a wide variety of two-way digital wireless service offerings in North America operating at 1900 MHz. PCS services include next generation wireless phone and communication services, wireless local loop, inexpensive walk-around communications service with lightweight, low-powered handsets, in-building cordless voice services for business, in-building wireless LAN service for business, enhanced paging service as well as wireless services integrated with wired networks. A Personal Communications System refers to the hardware and software that provide communications services.
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| PCU: Packet Control Unit |
The Packet Control Unit (PCU) is a late addition to the GSM standard. It performs some of the processing tasks of the Base Station Controller (BSC), but for packet data. The allocation of channels between voice and data is controlled by the base station, but once a channel is allocated to the PCU, the PCU takes full control over that channel. The PCU can be built into the base station, built into the BSC, or even in some proposed architectures, it can be at the SGSN site.
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| PDA: Personal Digital Assistant |
Personal Digital Assistant (PDA) is a small, handheld wireless device for transmitting pages, data messages, faxes and e-mails. It also acts as an electronic organizer, giving you access to schedules and contact lists. The term is often used interchangeably with PIM (personal information manager). The 3Com PalmPilot is an example of a PDA or PIM.
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| PDC: Personal Digital Cellular |
Personal Digital Cellular (PDC) is a TDMA-based 2G mobile phone standard developed and used exclusively in Japan. PDC uses 25 kHz carrier, 3 time slots, pi/4-DQPSK modulation and low bit-rate 11.2 kbit/s and 5.6 kbit/s (half-rate) voice codecs. PDC is implemented in the 800 MHz (downlink 810-888 MHz, uplink 893-958 MHz), and 1.5 GHz (downlink 1477-1501 MHz, uplink 1429-1453 MHz) bands. The air interface is defined in RCR STD-27 and the core network MAP by JJ-70.10.
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| PDCP: Packet Data Convergence Protocol |
Packet Data Convergence Protocol (PDCP) is used in UMTS 3G network to map higher-level protocol characteristics onto the characteristics of the underlying radio-interface protocols, providing protocol transparency for higher-layer protocols. PDCP also provides protocol control information compression.
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| PDF: Policy Decision Function |
Policy Decision Function (PDF), a component in the IP Multimedia Subsystem (IMS), controls traffic entering the packet-switched network by allocating or denying IP bearer resources.
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| PDF: Probability Density Function |
In mathematics, a probability density function (pdf) represents a probability distribution in terms of integrals. Informally, a probability density function can be seen as a "smoothed out" version of a histogram: if one empirically measures values of a continuous random variable repeatedly and produces a histogram depicting relative frequencies of output ranges, then this histogram will resemble the random variable's probability density.
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| PDP Context |
Packet data protocol (PDP) context is a term used in the mobile wireless network indicating a logical association between an MS (Mobile Station) and PDN (Public Data Network) running across a GPRS network. The context defines aspects such as Routing, QoS (Quality of Service), Security, Billing etc.
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