Zobrazeno 1 - 10
of 373
pro vyhledávání: '"Vieira, João P."'
Recently, the covariant formulation of the geometric bifurcation theory, developed in a previous paper, has been applied to two elementary problems: the study of limit cycles of dynamical systems and the second part of Hilbert's sixteenth problem. Fi
Externí odkaz:
http://arxiv.org/abs/2412.01916
Autor:
Willhammar, Sara, Iimori, Hiroki, Vieira, Joao, Sundström, Lars, Tufvesson, Fredrik, Larsson, Erik G.
In what ways could cellular massive MIMO be improved? This technology has already been shown to bring huge performance gains. However, coverage holes and difficulties to transmit multiple streams to multi-antenna users because of insufficient channel
Externí odkaz:
http://arxiv.org/abs/2406.00142
Publikováno v:
IEEE Wireless Communications Letters, June 2024
We present a reciprocity calibration method for dual-antenna repeaters in wireless networks. The method uses bi-directional measurements between two network nodes, A and B, where for each bi-directional measurement, the repeaters are configured in di
Externí odkaz:
http://arxiv.org/abs/2403.17908
Publikováno v:
Advances in Intelligent Data Analysis XXII. IDA 2024. Lecture Notes in Computer Science, vol 14642., pp 95-106 (2024). Springer, Cham
We present S+t-SNE, an adaptation of the t-SNE algorithm designed to handle infinite data streams. The core idea behind S+t-SNE is to update the t-SNE embedding incrementally as new data arrives, ensuring scalability and adaptability to handle stream
Externí odkaz:
http://arxiv.org/abs/2403.17643
Reconfigurable surface (RS) has been shown to be an effective solution for improving wireless communication links in general multi-user multiple-input multiple-output (MU-MIMO) setting. Current research efforts have been largely directed towards the
Externí odkaz:
http://arxiv.org/abs/2310.19409
Autor:
de Brito, Hugo Rodrigues, de Souza, Valéria Monteiro, Vieira, João Paulo Abreu, Tostes, Maria Emília de Lima, Bezerra, Ubiratan Holanda, de Souza, Vanderson Carvalho, Pinheiro, Daniel da Conceição, Barata, Heitor Alves, Cardoso, Hugo Nazareno de Souza, Costa, Marcelo Sousa
This work investigates the impact of feeder bidirectional active power flow on the operation of two cascaded step voltage regulators (SVRs) located at a 34.5 kV rural distribution feeder. It shows that, when active power flow reversal is possible bot
Externí odkaz:
http://arxiv.org/abs/2310.09074
We consider a robust beamforming problem where large amount of downlink (DL) channel state information (CSI) data available at a multiple antenna access point (AP) is used to improve the link quality to a user equipment (UE) for beyond-5G and 6G appl
Externí odkaz:
http://arxiv.org/abs/2308.07132
Backscatter communication (BSC) is a promising solution for Internet-of-Things (IoT) connections due to its low-complexity, low-cost, and energy-efficient solution for sensors. There are several network infrastructure setups that can be used for BSC
Externí odkaz:
http://arxiv.org/abs/2306.17437
Backscatter communication (BC) is a promising technique for future Internet-of-Things (IoT) owing to its low complexity, low cost, and potential for energy-efficient operation in sensor networks. There are several network infrastructure setups that c
Externí odkaz:
http://arxiv.org/abs/2306.06658
Autor:
Larsson, Erik G., Vieira, Joao
Publikováno v:
IEEE Communications Letters, 2023
Antenna arrays can be either reciprocity calibrated (R-calibrated), which facilitates reciprocity-based beamforming, or fully calibrated (F-calibrated), which additionally facilitates transmission and reception in specific physical directions. We fir
Externí odkaz:
http://arxiv.org/abs/2304.05144