Hardware phenomenological effects on cochannel full-duplex MIMO relay performance

Abstract

Abstract-In this paper, the performance of cochannel fullduplex multiple-input multiple-output (MIMO) nodes is considered in the context of models for realistic hardware characteristics. Here, cochannel full-duplex relay indicates a node that transmits and receives simultaneously in the same frequency band. It is assumed that transmit and receive phase centers are physically distinct, enabling adaptive spatial transmit and receive processing to mitigate self-interference. The use of MIMO indicates a self-interference channel with spatially diverse inputs and outputs, although multiple modes are not employed in this paper. Rather, we focus on rank-1 transmit covariance matrices. In practice, the limiting issue for cochannel full-duplex nodes is the ability to mitigate self-interference. While theoretically a system with infinite dynamic range and exact channel estimation can mitigate the self-interference perfectly, in practice, transmitter and receiver dynamic range, nonlinearities, and noise, as well as channel dynamics, limit the practical performance. In this paper, we investigate self-interference mitigation limitations in the context of eigenvalue spread of spatial transmit and receive covariance matrices caused by realistic hardware models.

Joint Beamforming Optimization and Power Control for Full-Duplex MIMO Two-Way Relay Channel

“…To simplify the signal model and make the optimization problems more tractable, we add the ZF constraint such that the optimization of W nulls out the residual SI from the relay output to relay input. To realize this, it is easy to check from (3) that the following condition is sufficient, (6) with the covariance matrix…”

“…In the proposed scheme, all nodes, including the two sources and the relay, work in the FD mode so they can transmit and receive signals simultaneously [5] [6]. However, the major challenge in the FD operation is that the power of the self-interference (SI) from the relay output could be over 100 dB higher than that of the signal received from distance sources and well exceeds the dynamic range of the analog-to-digital converter [7], [8], [9].…”

Low-Complexity End-to-End Performance Optimization in MIMO Full-Duplex Relay Systems

“…However, in the second case, while (3,2,3,1) and ( probability. For comparison, we have included results for half-duplex hop-by-hop beamforming [33] with two configurations, namely (2, 2, 1, 1) and (2, 3, 3, 1) and γ T = 2 2R0 − 1.…”

“…In order to complete the relaying operation, half-duplex relaying requires two orthogonal channels and the associated bandwidth loss recovery has been an active research area for several years. With full-duplex relaying, the relay node receives and transmits simultaneously on the same channel and therefore utilizes the spectrum resources more efficiently [2], [3]. However, the main limitation in full-duplex operation is the loopback interference (LI) (also known in the literature as the loopback self-interference) due to signal leakage from the relay's output to the input at the reception side [4]- [7].…”

Optimum Single Antenna Full Duplex Using Hybrid Junctions

“…Analog cancellation [4]- [6], [8], [10], [14], [15], can provide significant isolation prior to the receiver, reducing selfinterference and preventing receiver overloading, making it a requirement in most practical systems [4]. Significant progress has also been made in understanding the impact of hardware limitations and other imperfections on system performance [16]- [19], and network capacity and MAC protocols for full duplex networks have also been the subject of investigation [8], [12], [20]- [23].…”