Precoding and Decoding Schemes for Downlink MIMO-RSMA with Simultaneous Diagonalization and User Exclusion

Diab R, Krishnamoorthy A, Schober R (2022)

Publication Type: Conference contribution

Publication year: 2022

Publisher: Institute of Electrical and Electronics Engineers Inc.

Pages Range: 586-591

Conference Proceedings Title: 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022

Event location: Seoul KR

ISBN: 9781665426718

DOI: 10.1109/ICCWorkshops53468.2022.9814475

Abstract

In this paper, we consider the precoder design for downlink multiple-input multiple-output (MIMO) rate-splitting multiple access (RSMA) systems. The proposed scheme with simultaneous diagonalization (SD) decomposes the MIMO channel matrices of the users into scalar channels via higher-order generalized singular value decomposition for the common message (CM) and block diagonalization (BD) for the private messages, thereby enabling low-complexity element-by-element successive interference cancellation (SIC) and decoding at the receivers. Furthermore, the proposed SD MIMO-RSMA overcomes a critical limitation in RSMA systems, whereby the achievable rate of the CM is restricted by the users with weak effective MIMO channel for the CM, by excluding a subset of users from decoding the CM. We formulate a non-convex weighted sum rate (WSR) optimization problem for SD MIMO-RSMA and solve it via successive convex approximation to obtain a locally optimal solution. Our simulation results reveal that, for both perfect and imperfect CSI, the proposed SD MIMO-RSMA with user exclusion outperforms baseline MIMO-RSMA schemes and linear BD precoding.

Authors with CRIS profile

Aravindh Krishnamoorthy Lehrstuhl für Digitale Übertragung (IDC) Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

How to cite

APA:

Diab, R., Krishnamoorthy, A., & Schober, R. (2022). Precoding and Decoding Schemes for Downlink MIMO-RSMA with Simultaneous Diagonalization and User Exclusion. In 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022 (pp. 586-591). Seoul, KR: Institute of Electrical and Electronics Engineers Inc..

MLA:

Diab, Rouaa, Aravindh Krishnamoorthy, and Robert Schober. "Precoding and Decoding Schemes for Downlink MIMO-RSMA with Simultaneous Diagonalization and User Exclusion." Proceedings of the 2022 IEEE International Conference on Communications Workshops, ICC Workshops 2022, Seoul Institute of Electrical and Electronics Engineers Inc., 2022. 586-591.

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