Secrecy Outage Analysis of Energy Harvesting Enabled Two User Cooperative NOMA

In this paper, we evaluate the secrecy outage probability (SOP) of two user cooperative non-orthogonal multiple access (C-NOMA) network in the presence of a passive eavesdropper (E). The near user
$(U_{1})$
harvests energy from the superimposed signal transmitted by source (S). The near user
$(U_{1})$
acts as a relay and retransmits the message signal to a far user
$(U_{2})$
. The E eavesdrops the signal for
$U_{1}$
and
$U_{2}$
transmitted from
$\mathbf{S}$
and eavesdorp the signal of
$U_{2}$
relayed from
$U_{1}$
. An MRC is applied at E on two copies of signals obtained for
$U_{2}$
. An analytical framework for evaluating SOP is presented. We obtain an analytical expression for SOP of
$U_{1}$
, while an analytical expression of SOP of
$U_{2}$
at high SNR approximation is obtained. Impact of several netwrok parameters such as target secrecy rate, energy harvesting parameters on SOP is indicated. Our analytical results are supported by monte-carlo simulation carried out in MATLAB.