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I read the paper :http://jultika.oulu.fi/files/nbnfi-fe2019040110636.pdf

The author said :

First ,$x_s=x_1+x_2$,and the transmitter transmit the $x_s$ to $U_1$,and the received signal in the $U_1$ is $y_1=h_i x_s+n_i$,and there is a power splitter in the $U_1$,and $y_1^{ip}=\sqrt{1-\rho}y_1$

$U_1$ decodes $x_2$ based on $y^{ip}_1$, then applies successive interference cancellation (SIC) before decoding $x_1$.I don't really understand about here

My question is that what does "then applies successive interference cancellation (SIC)" mean ?and what does it do? I know that $U_1$ decode $x_2$ first then decode $x_1$,so is this called "SIC"?

Another question is that the paper also said the $U_1$ deocode the $x_2$ then decode $x_1$,and harvest the power of $x_s$,then use this energy to send the $x_2$ to another receiver $U_2$,then $U_2$ will decode the $x_2$.Why should we decode the $x_2$ in the $ U_1$ when we know we will decode $x_2$ again in the $U_2$ in the future?Is there any application about this in the real world?

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