Capacity Analysis of Non-Coaxial OAM-NOMA Under Imperfect SIC

초록

Orbital angular momentum is one of the best candidates for future 6G communication and in combination with NOMA, enhanced data rates can be achieved by utilizing non-orthogonal resource allocation of NOMA and orthogonal OAM modes. In this paper, at the transmitter side fixed power allocation and at the receiver side, successive interference cancelation (SIC) for the removal of multiuser interference is considered. In practical scenarios, in the SIC process, errors can occur leading to residual interference reducing the system capacity. This paper analyzes the effect of imperfection in successive interference cancellation (SIC) for non-coaxial orbital angular momentum based non-orthogonal multiple access (NOMA) communication for multiple users. The simulation results show that although the capacity of OAM-NOMA reduces with the imperfect SIC but it performs better than the conventional methods such as orthogonal multiple access (OMA-OAM) and NOMA when the error in SIC process is not too large.

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