171 citations · 573 across the 38 of their papers we have counts for
11 papers · 1 filter
Bayesian Methods for Multiple Change-Point Detection with Reduced Communication
Eyal Nitzan, Topi Halme, Visa Koivunen
In many modern applications, large-scale sensor networks are used to perform statistical inference tasks. In this paper, we propose Bayesian methods for multiple change-point detec…
A Bayesian algorithm for distributed network localization using distance and direction data
Hassan Naseri, Visa Koivunen
A reliable, accurate, and affordable positioning service is highly required in wireless networks. In this paper, the novel Message Passing Hybrid Localization (MPHL) algorithm is p…
Joint Device Positioning and Clock Synchronization in 5G Ultra-Dense Networks
Mike Koivisto, Mário Costa, Janis Werner +5
In this article, we address the prospects and key enabling technologies for highly efficient and accurate device positioning and tracking in 5G radio access networks. Building on t…
Ambiguity Function of the Transmit Beamspace-Based MIMO Radar
Yongzhe Li, Sergiy A. Vorobyov, Visa Koivunen
In this paper, we derive an ambiguity function (AF) for the transmit beamspace (TB)-based multipleinput multiple-output (MIMO) radar for the case of far-field targets and narrow-ba…
Robust iterative hard thresholding for compressed sensing
Esa Ollila, Hyon-Jung Kim, Visa Koivunen
Compressed sensing (CS) or sparse signal reconstruction (SSR) is a signal processing technique that exploits the fact that acquired data can have a sparse representation in some ba…
A Sensing Policy Based on Confidence Bounds and a Restless Multi-Armed Bandit Model
Jan Oksanen, Visa Koivunen, H. Vincent Poor
A sensing policy for the restless multi-armed bandit problem with stationary but unknown reward distributions is proposed. The work is presented in the context of cognitive radios…
SINR Analysis of Opportunistic MIMO-SDMA Downlink Systems with Linear Combining
Man-On Pun, Visa Koivunen, H. Vincent Poor
Opportunistic scheduling (OS) schemes have been proposed previously by the authors for multiuser MIMO-SDMA downlink systems with linear combining. In particular, it has been demons…
Spectrum Sensing in Cognitive Radios Based on Multiple Cyclic Frequencies
Jarmo Lundén, Visa Koivunen, Anu Huttunen +1
Cognitive radios sense the radio spectrum in order to find unused frequency bands and use them in an agile manner. Transmission by the primary user must be detected reliably even i…
Blind Estimation of Multiple Carrier Frequency Offsets
Yuanning Yu, Athina P. Petropulu, H. Vincent Poor +1
Multiple carrier-frequency offsets (CFO) arise in a distributed antenna system, where data are transmitted simultaneously from multiple antennas. In such systems the received signa…
Opportunistic Scheduling and Beamforming for MIMO-SDMA Downlink Systems with Linear Combining
Man-On Pun, Visa Koivunen, H. Vincent Poor
Opportunistic scheduling and beamforming schemes are proposed for multiuser MIMO-SDMA downlink systems with linear combining in this work. Signals received from all antennas of eac…
Complex Random Vectors and ICA Models: Identifiability, Uniqueness and Separability
Jan Eriksson, Visa Koivunen
In this paper the conditions for identifiability, separability and uniqueness of linear complex valued independent component analysis (ICA) models are established. These results ex…