Statistical power allocation for downlink two-user power-domain MIMO-NOMA with excess degrees of freedom

Krishnamoorthy A, Schober R (2020)

Publication Type: Conference contribution

Publication year: 2020

Publisher: VDE Verlag GmbH

Conference Proceedings Title: WSA 2020 - 24th International ITG Workshop on Smart Antennas

Event location: Hamburg DE

ISBN: 9783800752003

Abstract

In this paper, we investigate statistical power allocation (SPA) for downlink two-user power-domain multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) to enhance the ergodic rate performance. We utilize a modified generalized singular value decomposition (M-GSVD) based precoding scheme which simultaneously diagonalizes the MIMO-NOMA channels of the users into multiple single-input single-output (SISO) NOMA channels, thereby reducing the decoding complexity. The M-GSVD precoding scheme is also able to exploit excess degrees of freedom at the base station to improve MIMO-NOMA performance. Based on finite-size random matrix theory, we derive novel expressions for the ergodic achievable rate of MIMO-NOMA with M-GSVD precoding and non-equal power allocation, which are then used for SPA and for obtaining the ergodic achievable rate region. The derived expressions are validated with Monte-Carlo simulations. Our results show that the proposed scheme outperforms M-GSVD precoding with equal power allocation and orthogonal multiple access, thereby demonstrating the benefits of SPA.

Authors with CRIS profile

Aravindh Krishnamoorthy Lehrstuhl für Digitale Übertragung Robert Schober Lehrstuhl für Digitale Übertragung

How to cite

APA:

Krishnamoorthy, A., & Schober, R. (2020). Statistical power allocation for downlink two-user power-domain MIMO-NOMA with excess degrees of freedom. In WSA 2020 - 24th International ITG Workshop on Smart Antennas. Hamburg, DE: VDE Verlag GmbH.

MLA:

Krishnamoorthy, Aravindh, and Robert Schober. "Statistical power allocation for downlink two-user power-domain MIMO-NOMA with excess degrees of freedom." Proceedings of the 24th International ITG Workshop on Smart Antennas, WSA 2020, Hamburg VDE Verlag GmbH, 2020.

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