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
ISBN: 9783800752003
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.
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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