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The Impulse Response of a Wireless Fading Channel

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saeddawoud

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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?

Thanks in advance
 
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