Please help me quickly$4$: Let us consider an example of two devices communication using $802\mathrm{.}1ln$ in the $5GHz$ band with a channel

width of $80MHz.$ The two edges of the channel are at frequencies $5$ and $5\mathrm{.}08GHz,$ and the channel between

the two devices has two paths as illustrated in the following figure $($i$.$e$.,$ one is called line$-$of$-$sight signal and

the another is called reflection signal$).$ Suppose that the signal transmitted at Tx is a sinusoidal one $x(t)$ and

there's no loss in the transmission as well as the reflection, then:

a$.$ Determine the received signals $y_1(t)$ and $y_2(t)$ and the relationship between L$1,$ L$2,$ L$3$ such that

the total received signal at $Rx$ is highest and lowest in amplitude.

b$.$ What could be stated about the interference of $y_1(t)$ and $y_2(t)$ at the frequency $5GHz$ and $5\mathrm{.}08$

$GHz$ when $L1($distance from Tx to A$)=5m,L2($distance from Rx to A$)=3m,L3($distance from Tx

to $Rx?$

c$.$ To improve the quality of signal at $5\mathrm{.}08GHz,$ there's an excellent idea from a fourth year RMIT student,

that is$,$ to rotate the mirror around point A$.$ Do you think it is a good idea and what would be the

minimum angle to be rotated so that the total received signal at $Rx$ is maximized in amplitude at $5\mathrm{.}08$

$GHz.($Tx and Rx are fixed and L$1($TxA$)=5m,L2(RxA)=3m,L3(TxRx)=6\mathrm{.}2m$