DocumentCode :
446
Title :
Rate Gain Region and Design Tradeoffs for Full-Duplex Wireless Communications
Author :
Ahmed, Erfan ; Eltawil, Ahmed M. ; Sabharwal, Ashutosh
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Irvine, Irvine, CA, USA
Volume :
12
Issue :
7
fYear :
2013
fDate :
Jul-13
Firstpage :
3556
Lastpage :
3565
Abstract :
In this paper, we analytically study the regime in which practical full-duplex systems can achieve larger rates than an equivalent half-duplex systems. The key challenge in practical full-duplex systems is uncancelled self-interference signal, which is caused by a combination of hardware and implementation imperfections. Thus, we 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, we study the rate gain region, which is defined as the region of received signal-of-interest strength where full-duplex systems outperform half-duplex systems in terms of achievable rate. The rate gain region is derived as a piecewise linear approximation in log-domain, and numerical results show that the approximation closely matches the exact region. Our analysis shows that when phase noise dominates mixer and quantization noise, full-duplex systems can use either active analog cancellation or baseband digital cancellation to achieve near-identical rate gain regions. Finally, as a design example, we numerically investigate the full-duplex system performance and rate gain region in typical indoor environments for practical wireless applications.
Keywords :
indoor radio; interference suppression; low noise amplifiers; oscillators; quantisation (signal); radio networks; radiofrequency interference; active analog cancellation; analog-to-digital converter quantization noise; baseband digital cancellation; design tradeoffs; full-duplex systems; full-duplex wireless communications; indoor environments; low-noise amplifier noise figure; mixer noise; oscillator phase noise; rate gain region; received signal-of-interest strength; uncancelled self-interference signal model; Full-duplex; analog self-interference cancellation; digital self-interference cancellation; radio impairments; rate gain;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2013.060413.121871
Filename :
6542771
Link To Document :
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