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The Question asked is as follows:

A communication link operates at a bitrate of 20 Mbps. The receiver is expected to perform at a $BER$ of $10^{-6}$ or better using $QPSK$ modulation scheme.

[Note: $BER$ for $QPSK$ is given by $Q(\sqrt{2Eb/ N_0})$. Use the approximation $Q(x)≈ \frac{1}{2} e^{\frac{{−x}^2}{2}}$]

(a) Determine the minimum $\frac{Eb}{N0}$ in dB needed to achieve the desired $BER$ performance.

(b) Given that the noise figure of the receiver is 8 dB, determine the receiver sensitivity in dBm.

(c) If the required link margin is 20 dB and the transmit power $P_{Tx} = 0.5 W$, determine the maximum possible path-loss, $L$, in dB

(d) Using a carrier frequency of 5 GHz and assuming free-space propagation model, determine the maximum possible range in $m$ for this system.

I attempted to solve the question, but my answers didn't match with the given answers. Any help on how to go about solving this would be highly appreciated. Thanks.

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    $\begingroup$ That’s awesome that you attempted the question, can you add details of your attempt so then we can more directly help you? $\endgroup$ – Engineer May 4 at 9:36

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