@conference {503,
	title = { A quaternion-based approach to interference alignment with Alamouti coding},
	booktitle = {IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)},
	year = {2017},
	month = {December},
	publisher = {IEEE},
	organization = {IEEE},
	address = {Bilbao, Spain},
	abstract = {Based on the representation of Alamouti space-time codewords as quaternions, this paper proposes a scheme that combines interference alignment (IA) with Alamouti signals. The proposed formulation allows for a separation of the space-time block coding (to gain spatial diversity) and the IA precoding (to reduce or ideally suppress interference). Although this separation is not necessarily optimal, the splitting of alignment precoding and Alamouti encoding is particularly convenient because it enables the independent optimization of the IA solution using quaternionic versions of standard alternating optimization techniques such as the maximum signal-to-interference-plus-noise algorithm. Some numerical simulations are included to compare the performance of the proposed quaternion IA+Alamouti algorithm with standard IA algorithms in the complex domain as well as with interference cancellation schemes at the receiver side.},
	author = {Fanjul, Jacobo and Santamar{\'\i}a, Ignacio and Loucera, Carlos}
}
@conference {496,
	title = {Experimental Evaluation of Non-Coherent MIMO Grassmannian Signaling Schemes},
	booktitle = {16th International Conference on Ad Hoc Networks and Wireless (AdHoc-Now 2017)},
	year = {2017},
	month = {September},
	address = {Messina, Italy},
	abstract = {In this paper, we present an over-the-air (OTA) performance
analysis of Grassmannian signaling strategies in an orthogonal frequencydivision
multiplexing (OFDM) single-user multiple-input multiple-output
(SU-MIMO) scenario. Specically, we compare the Grassmannian signaling
technique to the dierential Alamouti scheme and a novel space-time
non-coherent scheme recently proposed in the context of 5G. As a performance
benchmark we include in the comparison the coherent Alamouti
scheme. We study the practical impairments associated to frequency
synchronization mismatches (frequency osets), as well as the eects of
time-varying channels for dierent spectral eciencies. The experimental
results show that non-coherent techniques are more robust to the
aforementioned impairments than the coherent Alamouti approach, while
Grassmannian methods are close to the dierential Alamouti scheme with
2 transmit antennas.},
	keywords = {Grassmannian signaling, MIMO testbed, Non-coherent communications, OFDM, Over-the-air (OTA) experiments},
	author = {Fanjul, Jacobo and Santamar{\'\i}a, Ignacio and Ib{\'a}{\~n}ez, Jes{\'u}s and Loucera, Carlos}
}
