| FACCH: Fast Associated Control Channel |
Fast Associated Control Channel (FACCH) is the channel derived by preempting information in a traffic channel. It is used to send handoff and similar messages.
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| Fading |
Fading is the variation in signal strength from its normal value. Fading is normally negative and can be either fast or slow. It is normally characterized by the distribution of fades, Gaussian, Rician, or Rayleigh.
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| FASS: Fast Access Station Switching |
Fast Access Station Switching (FASS), a concept in the WiMAX network, is a method by which an MS can change its access station from frame to frame depending on the station selection mechanism. The access station can be an RS, BS, or MMRBS. The MS refers to transmitting/receiving data to/from one of the active stations (the anchor station) during any given frame.
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| Fast fading |
Fast fading is the short term component associated with multipath propagation. It is influenced by the speed of the mobile terminal and the transmission bandwidth of the signal.
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| Fast Handoff |
Fast Handoff is a way that access points can let authenticated users roam among different access points without losing authentication. Fast handoff also makes voice-over-IP possible. Fast handoff will be made possible with the 802.11f specification.
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| Fast Packet Switching |
Fast Packet Switching is a packet-orientated, digital technology that transmits all data in a single packet format whether the information is video, voice or data. Fast packet switching uses short, fixed length packets (cells) and, via hardware switching, is capable of speeds between 100,000 and 1,000,000 packets/second.
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| FAW: Frame Alignment Word |
Frame Alignment Word (FAW) is a unique digital word used by codecs to allow them to resynchronize to the framing structure in the event of errors.
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| FBSS: Fast Base Station Switching |
Fast Base Station Switching (FBSS), defined in the IEEE 802.16-2005 (mobile WiMAX) network, is a method to allow switching between any type of access stations (like RS, BS, or MMR-BS). Switching can occur between the same type or different types of access stations.
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| FCC: Federal Communications Commission |
Federal Communications Commission (FCC) is the regulatory body governing communications technologies in the US. established by the Communications Act of 1934, as amended, and regulates interstate communications (wire, radio, telephone, telegraph and telecommunications) originating in the United States.
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| FCCH: Frequency Correction Channel |
Frequency Correction Channel(FCCH) is the logical channel in GSM systems used to transmit a frequency correction data burst of all "zeros". The resulting frequency shift seen by the mobile is then used for frequency correction.
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| FCH: Frame Control Header |
Frame Control Header (FCH) is a field in the IEEE802.16-2004 WIMAX protocol. The FCH specifies the burst profile and the length of one or more DL bursts that immediately follow the FCH.
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| FDCCH: Forward Digital Control CHannel |
Forward Digital Control Channel (FDDCH), defined in the IS-136, provides cellular standards for TDMA-based networks. FDCCH includes all downstream signalling and control information from cell site to user equipment. FDCCH works together with RDCCH (Reverse Digital Control CHannel) which is for the upstream signaling and controling information. FDCCH can be divided into a few logic channels such as BCCH, SCF and SPACH.
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| FDD: Frequency Division Duplex |
Frequency Division Duplex (FDD), used in cellular communication systems such as GSM, is a radio technology using a paired spectrum.
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| FDM: Frequency Division Multiplex |
Frequency Division Multiplexing (FDM) is a technique by which the carrier bandwidth is divided into sub-channels of different frequency widths -- each carrying a signal at the same time in parallel. Each channel is 30 kHz. All the signals may be amplified, conducted, translated in frequency and routed toward a destination as a single signal, resulting in economies which are the motivation for multiplexing. Receivers at the receiving end separates the multiplexed signals by means of frequency passing or rejecting filters, and demodulates the results individually, each in the manner appropriate for the modulation scheme used for that band or group.
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| FDMA: Frequency Division Multiple Access |
Frequency Division Multiple Access (FDMA) is a method of allowing multiple users to share the radio frequency spectrum by assigning each active user an individual frequency channel. In this practice, users are dynamically allocated a group of frequencies so that the apparent availability is greater than the number of channels.
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| Feature Group D |
Feature Group D is a local exchange carrier network service that, among other things, lets public-safety dispatch offices receive a 10-digit data stream, including the full call-back number, alongside wireless 911 calls. Offered as a way by which wireless carriers can meet FCC enhanced 911 rules and dispatch offices can overcome their current bandwidth limits.
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| FEC: Forward Error Correction |
Forward Error Correction (FEC) is a method of increasing the reliability of data communication. In one-way communication channels, a receiver does not have the option to request a re-transmission if an error was detected. Forward Error Correction is a method of sending redundant information with the data in order to allow the receiver to reconstruct the data if there was an error in transmission.
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| FER: Frame Erasure/Error Rate |
Frame Erasure/Error Rate is a measure of the number of frames of data that contained errors and could not be processed. FER is usually expressed as a percentage or exponent.
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| FFT: Fast Fourier Transform |
Fast Fourier Transform (FFT) is an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse. FFTs are of great importance to a wide variety of applications, from digital signal processing to solving partial differential equations to algorithms for quickly multiplying large integers.
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| FGD: Feature Group D |
Feature Group D (FGD) is a local exchange carrier network service that, among other things, lets public-safety dispatch offices receive a 10-digit data stream, including the full call-back number, alongside wireless 911 calls. FGD is offered as a way by which wireless carriers can meet FCC-enhanced 911 rules and dispatch offices can overcome their current bandwidth limits. This access group is associated with equal access arrangements which allow the end user to have the same dialing plan (1 plus the telephone number) to reach any predetermined long distance phone companies of their choice.
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| FH-CDMA: Frequency Hopping - Code divisi |
Frequency hopping - code division multiple access (FH-CDMA) is one of two basic modulation techniques used in spread spectrum signal transmission for CDMA-based wireless systems. It is the repeated switching of frequencies during radio transmission, often to minimize the effectiveness of the unauthorized interception or jamming of telecommunications.
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| FH: Frequency Hopping |
Frequency Hopping (FH) is a periodic changing of frequency or frequency set associated with transmission. It is a sequence of modulated pulses having a pseudorandom selection of carrier frequencies.
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| FHMA: Frequency hopping multiple access |
Frequency hopping multiple access (FHMA) is a digital technology used in Geotek Communications Inc.'s specialized mobile radio network.
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| FHSS: Frequency Hopped Spread Spectrum |
Frequency Hopped Spread Spectrum (FHSS) is a spread-spectrum method of transmitting signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. It is used in WLAN 802.11 physical layer.
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| FIRFinite Impulse Response |
Finite Impulse Response (FIR) is a technique used to characterize electrical circuits and networks in the time domain.
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