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In this paper, the authors analytically study the regime in which practical full-duplex systems can achieve larger rates than equivalent half-duplex systems. The key challenge in practical full-duplex systems is un-cancelled self-interference signal, which is caused by a combination of hardware and implementation imperfections. Thus, they first present a signal model which captures the effect of significant impairments such as oscillator phase noise, low-noise amplifier noise figure, mixer noise, and analog-to-digital converter quantization noise. Using the detailed signal model, they study the rate gain region, which is defined as the region of received signal-of-interest signal strength where full-duplex systems outperform half-duplex systems in terms of achievable rate.
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