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arXiv · 1709.02948

Spectral Efficiency of Multipair Massive MIMO Two-Way Relaying with Hardware Impairments

Jiayi Zhang·Xipeng Xue·Emil Björnson·Bo Ai·Shi Jin
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Abstract

We consider a multipair massive multiple-input multiple-output (MIMO) two-way relaying system, where multiple pairs of single-antenna devices exchange data with the help of a relay employing a large number of antennas $N$. The relay consists of low-cost components that suffer from hardware impairments. A large-scale approximation of the spectral efficiency (SE) with maximum ratio (MR) processing is derived in closed form, and the approximation is tight as $N \to \infty$. It is revealed that for a fixed hardware quality, the impact of the hardware impairments vanishes asymptotically when $N$ grows large. Moreover, the impact of the impairments may even vanish when the hardware quality is gradually decreased with $N$, if a scaling law is satisfied. Finally, numerical results validate that multipair massive MIMO two-way relaying systems are robust to hardware impairments at the relay.

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Jiayi Zhang, Xipeng Xue, Emil Björnson, Bo Ai, Shi Jin. 2017-09-09. Spectral Efficiency of Multipair Massive MIMO Two-Way Relaying with Hardware Impairments. https://arxiv.org/abs/1709.02948

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