Abstract
In this paper, the performance of orbital angular momentum (OAM) mode multiplexing systems is investigated in the presence of oscillator phase noise (PN). First, the OAM spectrum is calculated for an OAM carrying beam that is generated by a uniform circular array (UCA) connected to an imperfect oscillator. It is shown that the OAM mode purity is insensitive to PN. Subsequently, the system model of the UCA-based OAM multiplexing in the presence of PN is presented. Using this model, the signal-to-interference-plus-noise ratio (SINR) and the sum-rate of the system are derived as a function of PN statistics. The significant reduction in the system throughput due to the PN confirms the necessity of an effective PN mitigation scheme. Hence, the system model after applying a generic pilot-based PN mitigation is also investigated, and the SINR and the sum-rate after PN compensation are analytically derived. Simulation results, generated for various PN models, reveal the existing design trade-offs between the pilot overhead and the sum-rate in these systems.
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