# The Impulse Response of a Wireless Fading Channel

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#### saeddawoud

##### Full Member level 3
impulse response wireless channel

Hello,

According to Proakis, the equivalent low-pass impulse response of a multipath fading channel is given by:

$c(\tau;t)=\sum_n\alpha_n(t)\,\delta(\tau-\tau_n(t))\,\text{e}^{-j\theta_n(t)}$

The question is: where does the variable $\tau$ come from?

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