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Cologno Monzese, Italy

Vizziello A.,University of Pavia | Savazzi P.,University of Pavia | Borra R.,SIAE Microelettronica
IEEE Communications Letters | Year: 2016

The phase recovery scheme of a cross-polar interference cancellation (XPIC) system is considered here, assuming two completely independent RF transceiver chains for the two different polarizations. A novel Kalman-based algorithm is proposed to jointly recover the phase of both the main polarization signal and the interfering one, at each single receiver of an XPIC system. The time evolution of the received phases and frequencies is represented by using both a new four-state model and a simplified two-state implementation. Simulations are conducted considering a typical backhaul link and the results prove the effectiveness of the proposed solution, compared to a common phase-locked loop (PLL) approach. Unlike the PLL scheme, the proposed Kalman-based algorithm directly adapts its parameters according to the different channel conditions, i.e., the signal-to-noise ratio per bit (Eb/N0) and the the cross-polarization discrimination (XPD). © 2016 IEEE. Source

Spinello F.,University of Padua | Spinello F.,Twist off S.R.L. | Parisi G.,Twist off S.R.L. | Tamburini F.,Twist off S.R.L. | And 7 more authors.
IEEE Antennas and Wireless Propagation Letters | Year: 2016

A novel technique for generating high-order vortex beams in the radio-frequency domain is reported. Vortex beams with non-null radial index are generated by means of a dielectric mask, mounted upon either a twisted parabolic reflector or a conventional one. The far-field intensity pattern is compared to analytical models and numerical simulations, thus illustrating how diffraction and illumination can affect the generated fields. © 2015 IEEE. Source

Mari E.,Twist off S.R.L. | Spinello F.,Twist off S.R.L. | Spinello F.,University of Padua | Oldoni M.,SIAE Microelettronica | And 3 more authors.
IEEE Antennas and Wireless Propagation Letters | Year: 2015

The experimental proof that near-field radio communication channels based on orbital angular momentum (OAM) are naturally isolated is presented. In near-field zone, we show that two antennas, built for producing a beam with the same value of OAM, have a good throughput. On the other hand, antennas of different types, i.e., built for generating beams with different OAM values, including a standard ℓ = 0 antenna, exhibit a good modal isolation. © 2014 IEEE. Source

Tamburini F.,Twist off S.R.L. | Tamburini F.,University of Padua | Mari E.,Twist off S.R.L. | Mari E.,University of Padua | And 10 more authors.
Radio Science | Year: 2015

In this paper we report the results from outdoor experiments showing that it is possible to increase the data transmission capacity using at least three coherent, orthogonal beams on the same frequency, 17.128 GHz, each in a unique orbital angular momentum state. Each beam was encoded with the digital modulations used in present-day telecommunications. We achieved an error-free throughput of 3 × 11 Mbit/s with four-Quadrature Amplitude Modulation over a 7 MHz bandwidth over 100 m and 150 m long links. ©2015. American Geophysical Union. All Rights Reserved. Source

Oldoni M.,SIAE Microelettronica | Spinello F.,University of Padua | Spinello F.,Twist off S.R.L. | Mari E.,Twist off S.R.L. | And 7 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2015

Radio beams that carry nonzero orbital angular momentum (OAM) are analyzed from the viewpoint of a multiple-input-multipleoutput (MIMO) communication system. Often, the natural OAM-beam orthogonality cannot be fully exploited because of spatial constraints on the receiving antenna size. Therefore, we investigate how far OAM-induced phase variations can be exploited in spatial demultiplexing based on conventional (linear momentum) receivers. Performances are investigated versus position and size of the transmitting and receiving devices. The use of OAM-mode coherent superpositions is also considered, in view of recent work by Edfors et al. Our final goal is to assess the merits of an OAM-based MIMO system, in comparison with a conventional one. © 2015 IEEE. Source

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