~~(The talk will be given in English)

Speaker:   Dr. Mati Wax
                      
Monday, June 6th, 2016
15:00 - 16:00
Room 011, Kitot Bldg., Faculty of Engineering

Multipath Fingerprinting: Exploiting multipath for accurate indoor localization

Abstract
Localization of an emitter in rich multipath environments, indoors and outdoors, is a challenging problem. In such environments there is typically no line-of-sight propagation between the emitter and the receivers, and as a result the traditional localization techniques based on line-of-sight propagation between the emitter and the receivers are ill-suited. To cope with this problem, a new localization technique based on machine learning techniques has been developed. The basic premise of this technique, referred to as multipath fingerprinting, is that in rich multipath environments the characteristics of the multipath signals – the directions-of-arrival and the differential-time-delays – provide a unique "fingerprint" of the emitter's location. The fingerprint is extracted from the spatial-temporal covariance matrix of the signals received by the antenna array, and is founded on the lower dimensional subspace, known as the signal subspace, capturing the dominant multipath signals. The performance of this technique, as demonstrated by both simulated and real data, is highly superior to existing techniques – achieving 1 meter accuracy in typical indoor environments using only a single Access Point (AP).

Bio:
Mati was the Founder and CTO of Wavion, which was later acquired by Alvarion, where he has leaded the development of multiple-antenna technology for wireless broadband access. Before founding Wavion, Mati was the CTO of US Wireless, where he was
responsible for the development of a multiple-antenna Location Fingerprinting technology for position location. Prior to that Mati worked for 25 years in Rafael. In his last capacity in Rafael, he headed the Center for Signal Processing, focusing on research and development multiple-antenna technology for military applications. Mati is an IEEE Fellow and a recipient of the Israel Defense Award from the president of Israel. He has a B.Sc and M.Sc from the Technion and a Ph.D from Stanford University.

You are invited to attend a lecture

By:

Mr. Greg Kaplan

M.Sc. student of

Professor Jacob Scheuer of Electrical Engineering, Physical Electronics Department Tel Aviv University

Dynamically Controlled Plasmonic Nano-Antennas

Plasmonic nano-antennas at optical frequencies have been the focus of numerous studies during the last decade, resulting in applications ranging from spectroscopy and near-field microscopy to non-linear optics, holography, sensing and many others. Dynamically controlling the resonance frequency or the phase response of a nanoantenna is highly desirable, both for post-fabrication tuning and to enable novel applications such as an optical phased array. The latter concept facilitates beam steering and shaping without mechanical motion, and is therefore much sought after, with possible applications including laser steering for free-space optical communication, LIDARs, dynamic holographic displays and chip-scale photonic devices.

In the first part of the talk a reflective nano-antenna array utilizing vanadium dioxide (VO₂) as a means of continuous electrical steering of an incident IR beam will be proposed and analyzed. VO₂ is a phase-change material, which exhibits a phase transition around 67°C, accompanied by a large shift in its refractive index. The proposed device is a 1D finite array of slots in a gold film deposited over a layer of VO₂, supported by an alumina substrate. For the presented configuration we find that the phase response can be tuned over a range of 2.2 rad, yielding a steering angle of up to   from the normal, with a temperature gradient of less than 10°C across the array.

In the second part, experimental verification studies are presented, and future research directions are discussed.

Thursday, June 02, 2016, at 9:00

Room 011, Kitot Building