Investigation of full-duplex relay networks with imperfect channel estimation

Abstract

This paper investigates the effect of channel estimation errors on the capacity of full-duplex amplify-and-forward relay networks. We first derive the lower bound of the capacity in the presence of channel estimation errors and residual selfinterference due to full-duplex relaying. Accordingly, the optimal power allocation schemes in maximizing the capacity with joint power constraints are proposed for single-relay and multi-relay networks. Furthermore, optimal and suboptimal algorithms for joint relay selection and power allocation are provided for the comparison. Simulation results show the performance gains of the proposed algorithms versus per-node transmit power and relaynode number, and point out the significant effects of channel estimation errors and relay positioning on full-duplex cooperative relay networks.

Low complexity robust recursive beamforming for two‐way full duplex relay network

“…Moreover, in [22], all channels are assumed to be perfect, which is not realistic in practice. Many studies have focused on the channel estimation error (CEE) and its effects on the system performance [23, 24]. Thus, we study a case in which the partial CSI is available instead of full CSI at the relay and transceivers.…”

Efficient pilot design scheme for OFDM‐based full‐duplex systems

“…The major challenge for an FD transceiver is the strong self‐interference (SI) from its own transmission. For FD systems, how to provide a high‐performance channel impulse response (CIR) estimation by designing an appropriate pilot pattern is crucial to efficiently lower the effect of residual SI after RF SI cancellation (SIC) [4, 5].…”

“…In the FD systems, most research focused on the impact of imperfect CIR. The effect of channel estimation errors on the capacity of FD amplify‐and‐forward relay networks is investigated in [4]. The effect of channel estimation errors on the ergodic capacities for bidirectional FD transmission is focused on [5].…”

Pilot Optimization and Power Allocation for OFDM-Based Full-Duplex Relay Networks With IQ-Imbalances

“…The RF cancellation is to significantly reduce the SI power, and the baseband digital cancellation is to further remove the residual SI partially. For FD relay systems, how to provide a highperformance channel estimation by designing an appropriate channel estimator and optimizing pilot pattern and power allocation is crucial to efficiently lower the effect of residual SI after RF cancellation [11], [12].…”