Multipair Full-Duplex Relaying With Massive Arrays and Linear Processing

By Hien Quoc Ngo, Himal A. Suraweera, Michail Matthaiou, Erik G. Larsson. IEEE Journal on Selected Areas in Communications, 2014

395 citations recorded by the source corpus.

We consider a multipair decode-and-forward relay channel, where multiple sources transmit simultaneously their signals to multiple destinations with the help of a full-duplex relay station. We assume that the relay station is equipped with massive arrays, while all sources and destinations have a single antenna. The relay station uses channel estimates obtained from received pilots and zero-forcing (ZF) or maximum-ratio combining/maximum-ratio transmission (MRC/MRT) to process the signals. To significantly reduce the loop interference effect, we propose two techniques: i) using a massive receive antenna array; or ii) using a massive transmit antenna array together with very low transmit power at the relay station. We derive an exact achievable rate expression in closed-form for MRC/MRT processing and an analytical approximation of the achievable rate for ZF processing. This approximation is very tight, particularly for a large number of relay station antennas. These closed-form expressions enable us to determine the regions where the full-duplex mode outperforms the half-duplex mode, as well as to design an optimal power allocation scheme. This optimal power allocation scheme aims to maximize the energy efficiency for a given sum spectral efficiency and under peak power constraints at the relay station and sources. Numerical results verify the effectiveness of the optimal power allocation scheme. Furthermore, we show that, by doubling the number of transmit/receive antennas at the relay station, the transmit power of each source and of the relay station can be reduced by 1.5 dB if the pilot power is equal to the signal power, and by 3 dB if the pilot power is kept fixed, while maintaining a given quality of service.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/39a622d279243f0d73ef25922ed639afac1c99c8

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Citations in the corpus

Power Scaling Laws and Near-Field Behaviors of Massive MIMO and Intelligent Reflecting Surfaces (2020, methodology): “We will compare the IRS with the use of a conventional halfduplex mMIMO relay, which is also deployed in between a source and destination to improve the propagation conditions; see [24]–[26] and references therein for prior work on mMIMO relays.”
Weighted Sum-Rate Maximization for Reconfigurable Intelligent Surface Aided Wireless Networks (2019, background): “While RIS resembles a full-duplex amplify-and-forward relay [19], [20], it forwards the RF signals via passive reflection, and thus has advantages in both energy- and cost- efficiency.”