Precoding for Non-orthogonal Multiple Access with User Equipment Pairing

Abstract

Due to the tremendous throughput requirement, current spectrum allocation scheme of 4G long term evolution-advanced system can’t satisfy the need for future communications applications. Hence, researches have proposed a non-orthogonal multiple access (NOMA) technique as a candidate for 5G access system recently. This paper proposes two precoding matrix selection methods for the NOMA system and also provides an appropriate user equipment (UE) pairing method for NOMA. Combining the UE pairing with the proposed precoding selection method, results show that system capacity for NOMA system can be further improved.