Abstract
In this study, the physical layer resource allocation in orthogonal frequency-division multiple access (OFDMA) systems is studied by considering the non-linear effects of power amplifier (PA). The non-linearity produces cross-correlation among the subcarriers and results in deteriorating the OFDMA subcarriers orthogonality. Hence, the signal-to-interference ratio (SIR) of the output signal of PA for OFDMA signal with different power scaling factors for subcarriers is derived. Then, the theoretical SIR is verified by simulation result. Next, the optimisation problem is designed to maximise the total achievable downlink rate of all users by assigning subcarriers and power scaling factors. This non-convex problem is solved by comprehensive learning particle swarm optimisation. The simulation results show that when PA is non-linear, better total rate is achieved by considering non-linearity in resource allocation compared with the conventional resource allocation techniques.
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