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Transmit power minimization for vector-perturbation based NOMA systems: a sub-optimal beamforming approach

journal contribution
posted on 2019-05-01, 00:00 authored by L Bai, L Zhu, Q Yu, Jinho ChoiJinho Choi, W Zhuang
Non-orthogonal multiple access (NOMA) is one of the potential multiuser supporting techniques in the fifth generation (5G) cellular systems due to its higher spectrum efficiency (SE) and cell-edge throughput. Vector-perturbation (VP) is widely known as one of the nonlinear precoding schemes that achieves near-capacity performance in practical wireless multi-input-multi-output (MIMO) communication systems. In this paper, we propose a hybrid transmission strategy based on VP and NOMA (VP-NOMA) by designing a beamforming matrix with the power allocation strategy to minimize total transmit power for certain quality of service (QoS) requirements. Rather than searching for the optimal beamforming matrix, we propose a more intuitive sub-optimal algorithm, called iteration beamforming for VP-NOMA systems (IBVP-NOMA), to find beamforming vectors. Further, different user clustering strategies are considered and compared to enhance the performance of the VP-NOMA systems. The simulation results demonstrate that the proposed method requires lower transmit power than the NOMA system without VP.

History

Journal

IEEE transactions on wireless communications

Volume

18

Pagination

2679-2692

Location

Piscataway, N.J.

ISSN

1536-1276

eISSN

1558-2248

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, IEEE

Issue

5

Publisher

Institute of Electrical and Electronics Engineers