TitleWideband Full-Duplex MIMO Relays with Blind Adaptive Self-interference Cancellation
Publication TypeJournal Article
Year of Publication2017
AuthorsAntonio-Rodríguez, E, Werner, S, López-Valcarce, R, Riihonen, T, Wichman, R
JournalSignal Processing
Start Page74
Date Published01/2017
Keywordsasp, compass, full duplex
Abstract We develop adaptive self-interference cancellation algorithms for both filter-and-forward and decode-and-forwardmultiple-input multiple-output relays. The algorithms are blind in the sense that they only exploit the spectral propertiesof the transmitted signal to identify the self-interference channel, while dealing with frequency-selective channels andarbitrary signal spectra. Our approach is non-intrusive in the sense that the algorithms can successfully identify, track,and cancel the self-interference distortion while the relay is operating in its normal mode. We study the stationarypoints of the algorithms and analyze under which conditions they achieve perfect cancellation of the self-interference.Simulation results show that the algorithms provide residual self-interference levels below the noise floor by usingthe time samples of only a few OFDM symbols.