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F

FACCH

Dedicated channel for control information

Fading

Variation of signal attenuation with various variables, e.g. caused by multipath propagation, probabilistic

Fading margin

Design allowance value that provides for sufficient system gain or sensitivity to accommodate expected fading

Far field

Field in a distance of two times antenna dimension squared divided by wavelangth, the wave can be approximated by a spherical TEM-wave with orthogonal E- and H-field

FDD

Two channels, one for uplink, one for downlink used in parallel

Field strength

Size of a vector field e.g. in volts per meter, V/m, for an electric field E


Field strength pattern

Pattern of the field-strength, proportional to the square of the field strength pattern

Figure of merit

Quantity used to characterize the performance of a device, system or method, relative to its alternatives

Forward Error Correction

The message is encoded so that the receiver can detect and correct (some) errors without retransmission

Fourier spectrum

Spectrum caused by Fourier transform

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