102 citations · 120 across the 3 of their papers we have counts for
12 papers
Downlink Performance of Superimposed Pilots in Massive MIMO systems
Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera
In this paper, we investigate the downlink throughput performance of a massive multiple-input multiple-output (MIMO) system that employs superimposed pilots for channel estimation.…
Superimposed Pilots are Superior for Mitigating Pilot Contamination in Massive MIMO
Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera
In this paper, superimposed pilots are introduced as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple…
Asymptotic Performance Analysis of a K-Hop Amplify-and-Forward Relay MIMO Channel
Maksym A. Girnyk, Mikko Vehkaperä, Lars K. Rasmussen
The present paper studies the asymptotic performance of multi-hop amplify-and-forward relay multiple-antenna communication channels. Each multi-antenna terminal in the network ampl…
Asymptotic Analysis of SU-MIMO Channels With Transmitter Noise and Mismatched Joint Decoding
Mikko Vehkaperä, Taneli Riihonen, Maksym A. Girnyk +4
Hardware impairments in radio-frequency components of a wireless system cause unavoidable distortions to transmission that are not captured by the conventional linear channel model…
Signal recovery using expectation consistent approximation for linear observations
Yoshiyuki Kabashima, Mikko Vehkapera
A signal recovery scheme is developed for linear observation systems based on expectation consistent (EC) mean field approximation. Approximate message passing (AMP) is known to be…
Blind pilot decontamination
Ralf Müller, Laura Cottatellucci, Mikko Vehkaperä
A subspace projection to improve channel estimation in massive multi-antenna systems is proposed and analyzed. Together with power-controlled hand-off, it can mitigate the pilot co…