DSpace Collection:http://hdl.handle.net/2289/75892023-11-02T09:31:11Z2023-11-02T09:31:11ZSystem and method for navigation assistance in a scattering environmentRamachandran, HemaAlouini, MehdiFade, JulienBretenaker, Fabienhttp://hdl.handle.net/2289/76082021-07-28T06:25:46Z2015-09-01T00:00:00ZTitle: System and method for navigation assistance in a scattering environment
Authors: Ramachandran, Hema; Alouini, Mehdi; Fade, Julien; Bretenaker, Fabien
Abstract: For performing navigation assistance in a scattering environment, a system is intended to detect at least one navigational light marker in scenes captured by an image capturing device, each navigational light marker generating a light beam having a predefined polarization state. The system includes an image capturing device that is adapted for: capturing a first image of a scene, said first image being polarized in accordance with the predefined polarization state of the light beam generated by said navigational light marker(s); capturing a second image of the scene, said second image being polarized according to a polarization state orthogonal to the polarization state of the first image; generating a polarimetric contrast image by combining the first and second captured images; and providing a feedback for performing navigation assistance in the scattering environment, on the basis of the generated polarimetric contrast image.
Description: Open Access2015-09-01T00:00:00ZOptical receiver for full-field optical quadrature demodulationPanigrahi, SwapneshRamachandran, HemaFade, JulienAlouini, Mehdihttp://hdl.handle.net/2289/76072021-07-28T06:26:19Z2017-11-01T00:00:00ZTitle: Optical receiver for full-field optical quadrature demodulation
Authors: Panigrahi, Swapnesh; Ramachandran, Hema; Fade, Julien; Alouini, Mehdi
Abstract: An optical receiver for performing full-field quadrature demodulation of modulated light signals includes a first polarizing mechanism (P1), a second polarizing mechanism (P2, P3), a beam-splitting mechanism (BS2), an electro-optic modulator (EOM), a quarter-wave retarder mechanism (W), at least one camera sensor (C). The beam-splitting mechanism (BS2) separates incident light beam transmitted by the electro-optic modulator (EOM) so as to allow part of the incident light beam to pass via the quarter-wave retarder mechanism (W) before incurring polarization by the second polarizing mechanism, while another part of the incident light beam incurs polarization by the second polarizing mechanism without passing via the quarter-wave retarder mechanism (W). Q-quadrature and I-quadrature images are accordingly formed on the at least one camera sensor (C). The optical receiver further comprises circuitry configured to perform the full-field quadrature demodulation on the basis of light beams simultaneously acquired to obtain I-quadrature and Q-quadrature images.
Description: Open Access2017-11-01T00:00:00Z