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Mitigation of Loopback Self-Interference in Full-Duplex MIMO Relays

Riihonen, T. ; Werner, S. ; Wichman, R.

IEEE transactions on signal processing, 2011-12, Vol.59 (12), p.5983-5993 [Periódico revisado por pares]

New York, NY: IEEE

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Título:
Mitigation of Loopback Self-Interference in Full-Duplex MIMO Relays
Autor: Riihonen, T. ; Werner, S. ; Wichman, R.
Assuntos: Amplify-and-forward (AF) ; antenna selection (AS) ; Applied sciences ; beam selection (BS) ; Cancellation ; Channels ; decode-and-forward (DF) ; Detection, estimation, filtering, equalization, prediction ; Exact sciences and technology ; Filtering ; Filtration ; full-duplex ; Information, signal and communications theory ; Interference ; Interference cancellation ; Mean square error methods ; Mean square errors ; MIMO ; minimum mean square error (MMSE) ; multiple-input multiple-output (MIMO) relay ; Noise ; null-space projection ; Receiving ; Relaying ; Relays ; self-interference ; Signal and communications theory ; Signal, noise ; Subspaces ; Telecommunications and information theory
É parte de: IEEE transactions on signal processing, 2011-12, Vol.59 (12), p.5983-5993
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Full-duplex relaying is more spectrally efficient than half-duplex relaying as only one channel use is needed per two hops. However, it is crucial to minimize relay self-interference to render full duplex feasible. For this purpose, we analyze a broad range of multiple-input multiple-output (MIMO) mitigation schemes: natural isolation, time-domain cancellation, and spatial suppression. Cancellation subtracts replicated interference signal from the relay input while suppression reserves spatial dimensions for receive and transmit filtering. Spatial suppression can be achieved by antenna subset selection, null-space projection, i.e., receiving and transmitting in orthogonal subspaces, or joint transmit and receive beam selection to support more spatial streams by choosing the minimum eigenmodes for overlapping subspaces. In addition, minimum mean square error (MMSE) filtering can be employed to maintain the desired signal quality, which is inherent for cancellation, and the combination of time- and spatial-domain processing may be better than either alone. Targeting at minimal interference power, we solve optimal filters for each scheme in the cases of joint, separate and independent design. The performance of mitigation schemes is evaluated and compared by simulations. The results confirm that self-interference can be mitigated effectively also in the presence of imperfect side information.
Editor: New York, NY: IEEE
Idioma: Inglês

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Mitigation of Loopback Self-Interference in Full-Duplex MIMO Relays

Riihonen, T. ; Werner, S. ; Wichman, R.

New York, NY: IEEE

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