no code implementations • 10 Mar 2024 • Yinyan Bu, Robin Rajamäki, Anand Dabak, Rajan Narasimha, Anil Mani, Piya Pal
This paper addresses the problem of single snapshot Direction-of-Arrival (DOA) estimation, which is of great importance in a wide-range of applications including automotive radar.
no code implementations • 13 Jan 2024 • Robin Rajamäki, Piya Pal
In this paper, we show that two array geometries with identical sum co-arrays, and the same number of physical and virtual sensors, need not achieve equal identifiability, regardless of the choice of waveform of a fixed reduced rank.
no code implementations • 12 Jan 2024 • Robin Rajamäki, Risto Wichman
This paper studies the role of the joint transmit-receive antenna array geometry in shaping the self-interference (SI) channel in full-duplex communications.
no code implementations • 12 Jan 2024 • Yinyan Bu, Robin Rajamäki, Pulak Sarangi, Piya Pal
We explore deliberately introducing holes into this virtual array to leverage resolution gains provided by the increased aperture.
no code implementations • 12 Jan 2024 • Robin Rajamäki, Mehmet Can Hücümenoğlu, Pulak Sarangi, Piya Pal
In this paper, we make advances towards solidifying this understanding by revealing the role of the physical beampattern of the sparse array on the performance of low rank matrix completion techniques.
no code implementations • 10 May 2023 • Robin Rajamäki, Piya Pal
We derive necessary and sufficient conditions that the array geometry and transmit waveforms need to satisfy for the Kruskal rank -- and hence identifiability -- to be maximized.
no code implementations • 18 Oct 2020 • Robin Rajamäki, Visa Koivunen
The two array structures also achieve low redundancy, and a contiguous sum and difference co-array, which allows resolving vastly more scatterers or sources than sensors
no code implementations • 2 Dec 2019 • Robin Rajamäki, Sundeep Prabhakar Chepuri, Visa Koivunen
Simulations demonstrate that a hybrid sparse array with very few elements, and even fewer front ends, can achieve the resolution of a fully digital uniform array at the expense of a longer image acquisition time.