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Table 1 Symbol definition

From: Performance analysis of power-splitting relaying protocol in SWIPT based cooperative NOMA systems

Symbol Definition
\(h_0\) The complex channel coefficient of \(S \rightarrow {D_2}\)
\(h_1\) The complex channel coefficient of \(S \rightarrow {D_1}\)
\(h_2\) The complex channel coefficient of \({D_1} \rightarrow {D_2}\)
\(|h_0|^2\) Power gain of \(S \rightarrow {D_2}\)
\(|h_1|^2\) Power gain of \(S \rightarrow {D_1}\)
\(|h_2|^2\) Power gain of \({D_1} \rightarrow {D_2}\)
\(P_S\) Transmission power at S
\(\beta\) \((0<\beta <1)\) The power splitting ratio
\(P_r\) The transmission power at \(D_{1}\)
E[.] Expectation operation
\(E[|h_0|^2]=\Omega ^{-1}_0\) Expectation operation of the complex channel coefficient of \(S \rightarrow {D_2}\)
\(E[|h_1|^2]=\Omega ^{-1}_1\) Expectation operation of the complex channel coefficient of \(S \rightarrow {D_1}\)
\(E[|h_2|^2]=\Omega ^{-1}_2\) Expectation operation of the complex channel coefficient of \({D_1} \rightarrow {D_2}\)
T The total time block
\({\alpha _1}\) Power allocation coefficient for data symbol \(x_{1}\)
\({\alpha _2}\) Power allocation coefficient for data symbol \(x_{2}\)
\({n_{{D_1}}}\) Additive white Gaussian noise (AWGN) at \(D_{1}\) with zero mean and variance \({\sigma ^2}\)
\(\eta\) \((0<\eta <1)\) The energy harvesting efficiency at the energy receiver
\(\rho \buildrel \Delta \over = \frac{{{P_S}}}{{{\sigma ^2}}}\) The transmit signal-to-noise ratio (SNR)
\({\psi _I} = \left( {1 - \beta } \right)\) The IP coefficient
\({\psi _E} = \,\beta \eta\) The EH coefficient
\(R_{1}\) The target rate for detecting \(x_1\)
\(R_{2}\) The target rate for detecting \(x_2\)
R The total network throughput