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. From ITU-R models, [A.sub.0.01] for the link is found to be 19.78 dB and 18.43 dB for ITUR P530-12 and ITU-R P530-14 respectively.
Unlike threshold and dispersive
fade margin, key availability metrics, residual BER characterizes the radio in its "normal" operating RSS range.
The term used to indicate sensitivity is
fade margin, defined by how much interference or signal loss is acceptable before the system is no longer able to communicate.
Fade margin, measured in decibels, is a value given to the system noise budget to insulate the signals against the effect of the weather attenuation.
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.