selective fading การใช้

• This enlarges the distance at which selective fading occurs.
• Thus, frequency-selective fading and phase distortion can be easily counteracted.
• This is true especially on High frequency radio circuits where selective fading is present.
• Selective fading causes the mark signal amplitude to be randomly different from the space signal amplitude.
• Selective fading, or Rayleigh fading can cause two carriers to randomly and independently fade to different depths.
• In multi-diversity, e . g ., to mitigate frequency-selective fading or narrowband interference.
• OFDM divides the wideband signal into many slowly modulated narrowband subcarriers, each exposed to flat fading rather than frequency selective fading.
• Frequency-selective fading channels are also " dispersive ", in that the signal energy associated with each symbol is spread out in time.
• With transmit diversity, multiple antennas transmit delayed versions of a signal, creating frequency-selective fading, which is equalized at the receiver to provide diversity gain.
• Selective fading manifests as a slow, cyclic disturbance; the cancellation effect, or " null ", is deepest at one particular frequency, which changes constantly, sweeping through the received audio.
• "' Selective fading "'or "'frequency selective fading "'is a radio propagation anomaly caused by partial cancellation of a radio two different paths, and at least one of the paths is changing ( lengthening or shortening ).
• "' Selective fading "'or "'frequency selective fading "'is a radio propagation anomaly caused by partial cancellation of a radio two different paths, and at least one of the paths is changing ( lengthening or shortening ).
• The key idea behind AFH is to use only the  good frequencies, by avoiding the " bad " frequency channels perhaps those " bad " frequency channels are experiencing frequency selective fading, or perhaps some third party is trying to communicate on those bands, or perhaps those bands are being actively jammed.