Full-Duplex Relaying: Enabling Dual Connectivity via Impairments-Aware Successive Interference Cancellation

Conference: WSA 2020 - 24th International ITG Workshop on Smart Antennas
02/18/2020 - 02/20/2020 at Hamburg, Germany

Proceedings: ITG-Fb. 291: WSA 2020

Pages: 6Language: englishTyp: PDF

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Radhakrishnan, Vimal; Mathar, Rudolf (Institute for Theoretical Information Technology, RWTH University Aachen, 52074 Aachen, Germany)
Taghizadeh, Omid (Network Information Theory Group, Technische Universität Berlin, 10587 Berlin, Germany)

In this paper, we address the problem of resource allocation for a full duplex (FD)-enabled relaying system, where a massive multiple-input-multiple-output (mMIMO) multi-carrier (MC) base station (BS) communicates with a single antenna node, employing orthogonal frequency division multiplexing (OFDM). In particular, we consider a scenario that simultaneously activates the relay as well as the direct channel for communicating separate data streams, by employing successive interference cancellation (SuIC) at the end-user. In addition to the superior performance under various system conditions, the proposed dual-connectivity enjoys higher robustness when one of the active paths experience an unexpected blockage. In this regard, we formulate a joint power and subcarrier allocation problem to maximize the total sum rate by considering limited hardware and channel state information (CSI) accuracy. An iterative solution is proposed for the non-convex underlying problem, following the successive inner approximation (SIA) framework, with a guaranteed convergence to a solution satisfying the Karush–Kuhn–Tucker (KKT) optimality conditions. Numerical results show performance gain of our proposed SuIC scheme in terms of sum rate compared to single-connectivity and half duplex (HD) schemes.