Capacity improvement of non-orthogonal multiple access downlink transmission by orbital angular momentum based mode division multiple access

TL;DR

This paper proposes combining NOMA with OAM-based MDMA to enhance downlink transmission capacity by transmitting multiple superimposed signals via different OAM modes, outperforming traditional schemes.

Contribution

It introduces a novel integration of NOMA with OAM-based MDMA, enabling simultaneous transmission of multiple signals and capacity improvement in downlink communication.

Findings

Enhanced capacity over existing schemes

Effective use of OAM modes for superimposed signals

Demonstrated superiority over conventional orthogonal access

Abstract

In this paper, non-orthogonal multiple access (NOMA) downlink transmission is integrated with orbital angular momentum (OAM) based mode division multiple access (MDMA), called NOMA-OAM-MDMA. Different OAM modes can generate different OAM waves for different superimposed signals. So, every OAM wave will be transmitted a superimposed signal from the base station to the cell center user (CCU) and cell edge user (CEU). In this way, multiple OAM waves with multiple superimposed signals will transmit from BS to CCU and CEU simultaneously to enhance the capacity of NOMA downlink transmission. Finally, the effectiveness of the proposed schemes over the existing scheme and conventional orthogonal multiple access based scheme are demonstrated through the result analysis.