fading margin

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 ?
The threshold is known as fading margin m = [[R.sub.req]/[R.sub.rms]], here [R.sub.req] is the required received power level and [R.sub.rms] is the mean received power level.
As a result, FER in wireless channel depends on Doppler frequency shift, fading margin and frame duration.
In other words, for keeping 10-6 BER performance continuously in various conditions of rain, the required fading margin is minimum 13 dB.
Meanwhile, if the benchmark performance using [R.sub.0.01] rainfall intensity is 120 mm/h for Bandung, the required fading margin is 11 dB.
In other words, to obtain the BER performance [10.sup.-6] continuously, the necessary due fading margin is minimum 15 dB.
Thus an UWB system with a minimum SNR 10 dB and 5 dB fading margin can still be working well at BER [10.sup.-6].
It is interesting what was fading margin level in calculations of curves in Fig.