Abstract
Full-duplex relaying can increase the spectral efficiency by allowing the relay to transmit and receive at the same time and over the same frequency. To overcome the challenge that the destination treats the source-destination link as interference, we employ large-scale antenna array at the destination. By using the fact that the source-destination channel vector and relay-destination channel vector become pairwise orthogonal, the source-destination link can be converted to useful signal. We first derive the achievable rates and outage probabilities for direct transmission, half-duplex relaying, and full-duplex relaying, respectively. Two relaying protocols, i.e., amplify-and-forward (AF) and decode-and-forward (DF), are considered. Then, based on the channel state information (CSI) availability, the optimal transmit power of the full-duplex relay node is obtained by maximizing the achievable rates or minimizing the outage probabilities of full-duplex relaying. Numerical results show that the full-duplex relaying performs better than half-duplex relaying when the residual self-interference is small, and the performance of full-duplex relaying can be improved by using power control.
Highlights
In recent years, the fourth-generation (4G) mobile communication system has been deployed and used worldwide
It was shown that the full-duplex relaying is superior to half-duplex relaying in terms of the outage probability as the signal-to-interference ratios (SIRs) are higher and the signal-to-noise ratio (SNR) is lower
For half-duplex relaying, it is obvious that the system performance is optimized when the source and the relay use the maximum allowed transmit power, so we focus on power control for full-duplex relaying
Summary
The fourth-generation (4G) mobile communication system has been deployed and used worldwide. In [20], the authors investigated a multi-pair full-duplex relay system, where the relay is equipped with massive arrays and uses ZF and MRC/MRT to process the signals, and showed that the large number of spatial dimensions available can be effectively used to suppress the loop interference in the spatial domain. In [21], the authors studied the hardware impairments aware transceiver design for massive MIMO full-duplex relaying, where multiple source-destination pairs communicate simultaneously with the help of a fullduplex relay equipped with very large antenna arrays. Note that these works assume the relay is equipped with massive arrays, and there is no work considering the destination is equipped with massive arrays in full-duplex relay systems. We optimize the transmit power of the full-duplex relay node by maximizing the achievable rates or minimizing the outage probabilities
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