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.
Highlights
The fifth-generation (5G) wireless networks target a 1,000-fold increase in the network capacity to meet the ever growing user demands for high-speed and ubiquitous network access
To support such an ambitious goal, multiple-input multiple-output (MIMO) communications and cooperative orthogonal frequency division multiplexing (OFDM) relaying techniques play a key role in enhancing spectral efficiency and improving link reliability
We model the effect of shadowing by a log-normal random variable with mean of zero and standard deviation of 6dB
Summary
The fifth-generation (5G) wireless networks target a 1,000-fold increase in the network capacity to meet the ever growing user demands for high-speed and ubiquitous network access To support such an ambitious goal, multiple-input multiple-output (MIMO) communications and cooperative orthogonal frequency division multiplexing (OFDM) relaying techniques play a key role in enhancing spectral efficiency and improving link reliability. With simultaneous signal transmission and reception in the same time slot and on the same frequency band, an FD relay node transmits a packet while receiving another packet, thereby significantly reducing the end-to-end delay. Such bidirectional communication on the same radio resource block was assumed technically impossible, due to the huge self-interference (SI) introduced by the transmit antenna to the receive antenna on the same device. Advances in hardware design have suppressed the SI to a level potentially suitable for practical FD applications [4,5,6]
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