Joint power allocation for MIMO-OFDM full-duplex relaying communications

Abstract

In this paper, we address the problem of joint power allocation in a two-hop MIMO-OFDM network, where two full-duplex users communicate with each other via an amplify-and-forward relay. We consider a general model in which the full-duplex relay can forward the received message in either one-way or two-way mode. Our aim is to maximize the instantaneous end-to-end total throughput, subject to (i) the separate sum-power constraints at individual nodes or (ii) the joint sum-power constraint of the whole network. The formulated problems are large-scale nonconvex optimization problems, for which efficient and optimal solutions are currently not available. Using the successive convex approximation approach, we develop novel iterative algorithms of extremely low complexity which are especially suitable for large-scale computation. In each iteration, a simple closed-form solution is derived for the approximated convex program. The proposed algorithms guarantee to converge to at least a local optimum of the nonconvex problems. Numerical results verify that the devised solutions converge quickly, and that our optimal power allocation schemes significantly improve the throughput of MIMO-OFDM full-duplex one-way/two-way relaying over the conventional half-duplex relaying strategy.

Low-Latency Multiuser Two-Way Wireless Relaying for Spectral and Energy Efficiencies

“…Similarly, it is not easy to manage TWR multi-channel interference, which becomes double as compared to one-way relaying [21], [22]. The FD-based TWR suffers even more severe interference than the FD one-way relaying, which may reduce any throughput gain achieved by using fewer time slots [10].…”

MIMO-OFDM-Based Wireless-Powered Relaying Communication With an Energy Recycling Interface

“…With the current state-of-the-art technology of signal isolation and rejection, it is still not practical to mitigate the FD SI to a level worthy for simultaneous high uplink and downlink throughput [14]. Two-way relaying within one time-slot by a FD relay cannot be more efficient than that by a half-duplex relay in two time slots [15], [16]. However, such high-powered interference of the signal transmission to the signal reception by FD can open an opportunity for the simultaneous information transmission and energy-harvesting [17].…”

“…The communication range can be further extended by deploying cooperative relaying based communication to assist the transmission between the two distant ends. Considering relay-assisted networks, resource allocation in OFDM based communication with half-duplex (HD) relaying [36], [37] and FD relaying [15], [38] has been investigated. In addition, there are several recent studies which investigate EH in OFDM based systems too to assist the needs of energy constrained nodes [39]- [41].…”

Optimization for Signal Transmission and Reception in a Macrocell of Heterogeneous Uplinks and Downlinks

“…Let (v (κ) , p (κ) ) be a feasible point for (10) found from the (κ − 1)th iteration. Then the so called Dinkelbach's iteration [32] invokes the following optimization problem to generate (v (κ+1) , p (κ+1) ) at the κ-th iteration: (v (κ+1) , p (κ+1) ) at the κ-th iteration: 11), (12).…”