@article {947, title = {MMSE filter design for Full-Duplex filter-and-forward MIMO relays under limited dynamic range}, journal = {Signal Processing}, volume = {156}, year = {2019}, month = {03/2019}, pages = {208-219}, abstract = {
We study the problem of optimizing the end-to-end performance of a full-duplex filter-and-forward MIMO relay link, consisting
of a source, a relay, and a destination node, by employing linear filtering at each node. The system model accounts for multipath
propagation and self-interference at the relay, as well as transmitter impairments and limited dynamic range at every node. The
design accommodates signals with arbitrary spectra and includes the direct link between the source and destination nodes. Under
the minimum mean square error criterion, the resulting non-convex problem is approximated by a sequence of convex problems
and solved by means of an alternating minimization method. Linear constraints allocate some of the degrees of freedom in the relay
to guarantee a sufficiently small residual self-interference. Simulations quantify the impact of degrees of freedom, the dynamic
range, and the balance between direct and relay paths on the link performance.
}, keywords = {adaptive signal processing, full-duplex, winter}, doi = {doi.org/10.1016/j.sigpro.2018.11.001}, author = {Emilio Antonio-Rodr{\'\i}guez and Stefan Werner and R. L{\'o}pez-Valcarce and Risto Wichman} } @article {838, title = {Wideband full-duplex MIMO relays with blind adaptive self-interference cancellation}, journal = {Signal Processing}, volume = {130}, year = {2017}, month = {01/2017}, pages = {74-85}, chapter = {74}, abstract = {
We develop adaptive self-interference cancellation algorithms for both filter-and-forward and decode-and-forward
multiple-input multiple-output relays. The algorithms are blind in the sense that they only exploit the spectral properties
of the transmitted signal to identify the self-interference channel, while dealing with frequency-selective channels and
arbitrary 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 stationary
points 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 using
the time samples of only a few OFDM symbols.
}, keywords = {adaptive signal processing, compass, full duplex, winter}, issn = {0165-1684}, doi = {10.1016/j.sigpro.2016.06.010}, author = {Emilio Antonio-Rodr{\'\i}guez and Stefan Werner and R. L{\'o}pez-Valcarce and Taneli Riihonen and Risto Wichman} } @conference {808, title = {Subspace-constrained SINR optimization in MIMO full-duplex relays under limited dynamic range}, booktitle = {IEEE 16th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2015}, month = {06/2015}, publisher = {IEEE}, organization = {IEEE}, address = {Stockholm, Sweden}, abstract = {
We propose a method for maximizing the signal-to-interference-plus-noise ratio (SINR) in a wideband full-duplex MIMO regenerative relay that accounts limited dynamic range of the receiver and transmitter impairments. Transmit and receive filters are designed at the relay, by means of an alternating minimization algorithm, to minimize the interference at the decoder input in the destination node. We impose channel shortening and subspace constraints to ensure that the received signal at the destination is not compromised. Simulation results show that the presented method significantly outperforms other constrained approaches.
}, keywords = {adaptive signal processing, compass, full duplex}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {732, title = {SINR Optimization in Wideband Full-Duplex MIMO Relays under Limited Dynamic Range}, booktitle = {IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM)}, year = {2014}, address = {A Coru{\~n}a, Spain}, keywords = {adaptive signal processing, compass, full duplex}, doi = {10.1109/SAM.2014.6882369}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {693, title = {Adaptive Self-interference Cancellation in Wideband Full-Duplex Decode-and-Forward MIMO Relays}, booktitle = {IEEE 14th Int. Workshop on Signal Processing Advances in Wireless Communications (SPAWC)}, year = {2013}, month = {06/2013}, address = {Darmstadt, Germany}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/SPAWC.2013.6612074}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} } @conference {687, title = {Autocorrelation-based adaptation rule for feedback equalization in Wideband Full-Duplex Amplify-and-Forward MIMO relays}, booktitle = {Int. Conf. Acoust., Speech, Signal Process. (ICASSP)}, year = {2013}, abstract = {
Simultaneous reception and transmission in the same frequency, so-called full-duplex operation, causes an infinite feedback loop in an amplify-and-forward relay. The unwanted echoes may result in oscillation at the relay, making it unstable, and distorting the spectrum. This paper presents an adaptive MIMO filtering method for full-duplex amplify-and-forward relays that aims at solving the joint problem of self-interference mitigation and equalization of the source-relay channel. The scheme exploits knowledge of the autocorrelation of the transmitted signal as the only side information while allowing the relay, in the best case, to implement precoding as if there was not any self-interference or frequency selectivity in the source-relay channel. Finally, the proposed adaptation algorithm is investigated by determining its stationary points and by performing simulations in a MIMO-OFDM framework.
}, keywords = {adaptive signal processing, dynacs, full duplex}, doi = {10.1109/ICASSP.2013.6638606}, author = {Emilio Antonio-Rodr{\'\i}guez and R. L{\'o}pez-Valcarce and Taneli Riihonen and Stefan Werner and Risto Wichman} }