Abstract
In this paper, we analyze the performance of in-band full-duplex (IBFD) relay systems that use the decode-and-forward (DF) protocol at the relay under the impact of imperfect self-interference cancellation and hardware impairments. Three practical relay scenarios are considered in our analysis: (i) there is no direct link from the source to the destination; (ii) there is a direct link, but the signal from the source is considered interference; and (iii) there is a direct link, and the signal from the source is cooperatively combined with that from the relaying path. Specifically, we derive exact and asymptotic expressions for the outage probability (OP) of the IBFD system. Based on the OP, the exact expression for symbol error probability (SEP) is also derived. Moreover, in order to cope with the effect of imperfect self-interference cancellation (SIC) due to the full-duplex mode, we propose optimal and suboptimal power calculation methods for the relay to minimize the OP and SEP. A performance evaluation shows that the IBFD relay system is significantly affected by both imperfect SIC and hardware impairments. However, the optimal power values can help to improve the system performance, significantly.
Highlights
The last decade has witnessed significant development of wireless technologies
Performance of the in-band full-duplex (IBFD) relay network is analyzed for realistic cooperation situations (ii) Exact expressions of the signal-to-interferenceplus-noise-and-distortion ratio (SINDR) and outage performance are derived for three cases, i.e., (i) there is no direct link from the source to the destination; (ii) there is a direct link, but the signal from the source is considered interference; and (iii) there is a direct link, and the signal from the source is cooperatively combined with that from the relaying path (iii) In order to cope with the effect of imperfect selfinterference cancellation (SIC) due to the fullduplex mode, we propose optimal and suboptimal power calculation methods for the relay to minimize the outage probability (OP)
In order to alleviate the effect of RSI, we have proposed an optimal power calculation method based on the minimum OP for the case without the direct link and with the direct link but without cooperation
Summary
The last decade has witnessed significant development of wireless technologies. In particular, the evolvement of the fifth generation (5G) of mobile communications allows deployment of massive Internet of Things (IoT) devices to provide data access for various applications such as precision agriculture, disaster warning, smart retail, health care, smart home, and industrial innovation. (i) Inspired by the 5G HetNet structure [12], we develop a new system model for a more realistic IBFD relay network with hardware impairments and RSI Based on this model, performance of the IBFD relay network is analyzed for realistic cooperation situations (ii) Exact expressions of the signal-to-interferenceplus-noise-and-distortion ratio (SINDR) and outage performance are derived for three cases, i.e., (i) there is no direct link from the source to the destination; (ii) there is a direct link, but the signal from the source is considered interference; and (iii) there is a direct link, and the signal from the source is cooperatively combined with that from the relaying path (iii) In order to cope with the effect of imperfect selfinterference cancellation (SIC) due to the fullduplex mode, we propose optimal and suboptimal power calculation methods for the relay to minimize the OP.
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