fading margin

(redirected from Fade margin)
Also found in: Wikipedia.

fading margin

[′fād·iŋ ‚mär·jən]
(communications)
Number of decibels of attenuation which may be added to a specified radio-frequency propagation path before the signal-to-noise ratio of a specified channel falls below a specified minimum in order to avoid fading.
Allowance made in radio system planning to accommodate estimated fading.
References in periodicals archive ?
Contractors shall include fade margin calculations with the proposal, showing the antenna sizes, system gains, and system losses etc.
This implies that the average received signal is much higher than the squelch level; therefore the link availability is quite good even with low fade margin.
Once fire required fade margin (the depth of fade, expressed in decibels, which a microwave link can tolerate while still maintaining acceptable circuit quality) is achieved, Link Calc users can, within seconds, generate a fully itemized bill o materials.
Systems with the highest fade margin usually go longer distances.
Additional fade margin must be allocated in order to increase the system availability.
Multitap surface acoustic wave-based and application-specific integrated circuit-controlled adaptive time domain equalizers are deployed as a standard part of the demodulator circuitry to maximize the correction of intersymbol interference due to multipath fading and to achieve dispersive fade margin specifications equal to and, in many cases, better than systems using lower modulation schemes.
To overcome this fading, and the loss due to distance, more fade margin can be built into the path by using equipment with higher system gain.
The fade margin for the CCIR model would be the dB value of the rain loss which was 180 dB - FSL - vapor losses.