Fig. 4
From: User selection and dynamic power allocation in the SWIPT-NOMA relay system
The \(W\) comparison under various QoS requirements versus time when \(P_{S} = 40\) dbm. The decreasing trend of \(W\) indicates that the complexity of the mapping rule is not increasing and can be converged quickly. The x-axis is the time slot, and the y-axis is the value of \(W\). The illustrations are the USDPA with \(R_{th}\) = 0.2 bits/s/Hz, \(R_{th}\) = 0.25 bits/s/Hz, \(R_{th}\) = 0.3 bits/s/Hz, \(R_{th}\) = 0.35 bits/s/Hz, and \(R_{th}\) = 0.4 bits/s/Hz