A channel is characterized by the scattering function Signals are assumed to be uncorrelated when…

A channel is characterized by the scattering function

Signals are assumed to be uncorrelated when the spaced-time
spaced frequency correlation function drops to of its maximum value.

a. Determine delay and Doppler spreads, and also coherence
time and coherence bandwidth of the channel.

b. Determine the minimum value of the frequency separation
_f between two sinusoidal tones propagating through the channel so that
they fade independently of each other. Does this channel undergo flat- or
frequency-selective fading if the signal has a transmission bandwidth of 200
kHz, 2 MHz? What is

A channel is characterized by the scattering function

Signals are assumed to be uncorrelated when the spaced-time
spaced frequency correlation function drops to of its maximum value.

a. Determine delay and Doppler spreads, and also coherence
time and coherence bandwidth of the channel.

b. Determine the minimum value of the frequency separation
_f between two sinusoidal tones propagating through the channel so that
they fade independently of each other. Does this channel undergo flat- or
frequency-selective fading if the signal has a transmission bandwidth of 200
kHz, 2 MHz? What is the maximum signal bandwidth for which a flat-fading
assumption is valid?

c. Determine the minimum value of the time difference
between two sinusoidal tones cos 2_ft and cos 2_f t + _t propagating
through the channel so that they fade independently of each other. If the
channel impulse response is sampled every T seconds, for what value of T will
the samples be independent?

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