TitleMMSE filter design for Full-Duplex filter-and-forward MIMO relays under limited dynamic range
Publication TypeJournal Article
Year of Publication2019
AuthorsAntonio-Rodríguez, E, Werner, S, López-Valcarce, R, Wichman, R
JournalSignal Processing
Date Published03/2019
Keywordsadaptive signal processing, full-duplex, winter
Abstract We study the problem of optimizing the end-to-end performance of a full-duplex filter-and-forward MIMO relay link, consistingof a source, a relay, and a destination node, by employing linear filtering at each node. The system model accounts for multipathpropagation and self-interference at the relay, as well as transmitter impairments and limited dynamic range at every node. Thedesign accommodates signals with arbitrary spectra and includes the direct link between the source and destination nodes. Underthe minimum mean square error criterion, the resulting non-convex problem is approximated by a sequence of convex problemsand solved by means of an alternating minimization method. Linear constraints allocate some of the degrees of freedom in the relayto guarantee a sufficiently small residual self-interference. Simulations quantify the impact of degrees of freedom, the dynamicrange, and the balance between direct and relay paths on the link performance.