Walter C. Freitas Jr.

43 papers B 10Journal 16Unranked 17

Year	Rank	Type	Title / Venue / Authors
2025	J	`jnl`	Mitigating the Impact of Channel Aging in Cell-Free MIMO Systems Using a Channel Predictor Based on Extended Kalman Filter. IEEE Trans. Veh. Technol. A. Regilane L. Paiva, Walter C. Freitas Jr., Roberto P. Antonioli, Yuri C. B. Silva, Gábor Fodor
2024	—	`conf`	On Estimating the Angle of Arrival and Doppler Frequency in Bistatic and Multistatic Systems. VTC Fall Michel G. dos Santos, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., Igor B. Palhano
2024	—	`conf`	Power Allocation for Uplink Sensing and Communication in Cell-free ISAC Systems with Multi-Antenna Users and Multibeam. VTC Fall Igor B. Palhano, Roberto P. Antonioli, Yuri C. B. Silva, Gábor Fodor, Walter C. Freitas Jr., Michel G. dos Santos
2023	J	`jnl`	Decentralized Joint Pilot and Data Power Control Based on Deep Reinforcement Learning for the Uplink of Cell-Free Systems. IEEE Trans. Veh. Technol. Iran Mesquita Braga, Roberto Pinto Antonioli, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
2023	—	`conf`	Mixed Coherent and Non-Coherent Transmission for Multi-CPU Cell-Free Systems. ICC Roberto P. Antonioli, Iran Mesquita Braga, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
2022	—	`conf`	A Distributed Game-Theoretic Solution for Power Management in the Uplink of Cell-Free Systems. GLOBECOM (Workshops) Juno V. Saraiva, Roberto P. Antonioli, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva
2022	J	`jnl`	Mixed Coherent and Non-Coherent Transmission for Multi-CPU Cell-Free Systems. CoRR Roberto P. Antonioli, Iran M. Braga Jr., Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
2022	J	`jnl`	On the Energy Efficiency of Cell-Free Systems With Limited Fronthauls: Is Coherent Transmission Always the Best Alternative? IEEE Trans. Wirel. Commun. Roberto Pinto Antonioli, Iran Mesquita Braga, Gábor Fodor, Yuri C. B. Silva, André L. F. de Almeida, Walter C. Freitas Jr.
2021	J	`jnl`	Energy Efficiency Maximization Under Minimum Rate Constraints in Multi-Cell MIMO Systems With Finite Buffers. IEEE Trans. Green Commun. Netw. Juno Vitorino Saraiva, Roberto Pinto Antonioli, Gábor Fodor, Iran Mesquita Braga, Walter C. Freitas Jr., Yuri C. B. Silva, Carlos F. M. e Silva
2021	J	`jnl`	Semiblind Uni-ALS receiver for a two-way MIMO relaying system based on the PARATUCK2 model. Digit. Signal Process. Xi Han, Yingchun Zhou, André L. F. de Almeida, Walter C. Freitas Jr.
2020	J	`jnl`	Deep Reinforcement Learning for QoS-Constrained Resource Allocation in Multiservice Networks. CoRR Juno V. Saraiva, Iran M. Braga Jr., Victor Farias Monteiro, Francisco Rafael Marques Lima, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
2020	J	`jnl`	Hybrid Analog-Digital Beamforming Design for SE and EE Maximization in Massive MIMO Networks. IEEE Trans. Veh. Technol. Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., André L. F. de Almeida
2020	J	`jnl`	User Scheduling Based on Multi-Agent Deep Q-Learning for Robust Beamforming in Multicell MISO Systems. IEEE Commun. Lett. Iran M. Braga Jr., Eduardo de Olivindo Cavalcante, Gábor Fodor, Yuri C. B. Silva, Carlos F. M. e Silva, Walter C. Freitas Jr.
2019	—	`conf`	Kalman-Filter-Based Tracking of Millimeter-Wave Channel Parameters for V2X Applications. CSCN A. Regilane L. Paiva, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva, Carlos F. M. e Silva
2018	J	`jnl`	A Novel Cell Reconfiguration Technique for Dynamic TDD Wireless Networks. IEEE Wirel. Commun. Lett. Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
2018	J	`jnl`	A Unifying Design of Hybrid Beamforming Architectures Employing Phase Shifters or Switches. IEEE Trans. Veh. Technol. Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
2018	J	`jnl`	Distributed Beamforming in Dynamic TDD MIMO Networks With BS to BS Interference Constraints. IEEE Wirel. Commun. Lett. Eduardo de Olivindo Cavalcante, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
2018	J	`jnl`	Generalized Khatri-Rao and Kronecker space-time coding for MIMO relay systems with closed-form semi-blind receivers. Signal Process. Walter C. Freitas Jr., Gérard Favier, André L. F. de Almeida
2018	J	`jnl`	Pricing-Based Distributed Beamforming for Dynamic Time Division Duplexing Systems. IEEE Trans. Veh. Technol. Francisco R. V. Guimarães, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva
2018	B	`conf`	User Grouping Based on Spatial Compatibility for Dynamic-TDD Cooperative Networks. GLOBECOM Laszlon R. Costa, Darlan C. Moreira, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rafael Marques Lima
2017	—	`conf`	An ADMM approach to distributed coordinated beamforming in dynamic TDD networks. CAMSAP Khaled Ardah, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Gábor Fodor
2017	J	`jnl`	Sequential Closed-Form Semiblind Receiver for Space-Time Coded Multihop Relaying Systems. IEEE Signal Process. Lett. Walter C. Freitas Jr., Gérard Favier, André Lima Férrer de Almeida
2015	—	`conf`	Random Element Quantization for Finite Rate Feedback Systems. VTC Spring Khaled Ardah, Darlan C. Moreira, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2014	J	`jnl`	Blind Joint Channel Estimation and Data Detection for Precoded Multi-Layered Space-Frequency MIMO Schemes. Circuits Syst. Signal Process. Walter C. Freitas Jr., André L. F. de Almeida, João Paulo C. L. da Costa
2014	—	`conf`	Hybrid MIMO schemes with MRT precoding and modified SIC receiver. LATINCOM Francisco M. C. Caldas, Daniel C. Araujo, Walter C. Freitas Jr.
2014	—	`conf`	Performance of interference alignment techniques within CoMP-like systems. LATINCOM Paulo G. Normando, Elvis Miguel Galeas Stancanelli, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
2013	—	`conf`	A Modified Successive Interference Cancellation Algorithm for Hybrid Diversity/Spatial Multiplexing MIMO Schemes. VTC Spring Walter C. Freitas Jr., Carlos Igor Ramos Bandeira, Francisco M. C. Caldas, Wilkinson T. F. Moura
2013	B	`conf`	Block diagonalization with subspace based external interference mitigation. PIMRC Darlan C. Moreira, Paulo G. Normando, Carlos Igor Ramos Bandeira, Walter C. Freitas Jr., Yuri C. B. Silva, Francisco Rodrigo P. Cavalcanti
2013	B	`conf`	Clustering-based Assignment within CoMP systems. PIMRC Elvis Miguel Galeas Stancanelli, Yuri C. B. Silva, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2013	—	`conf`	Performance of Joint Antenna and User Selection Schemes for Interference Alignment in MIMO Interference Channels. VTC Spring Carlos Igor Ramos Bandeira, Darlan C. Moreira, Paulo G. Normando, Walter C. Freitas Jr., Yuri C. B. Silva, Francisco Rodrigo P. Cavalcanti
2012	—	`conf`	Maximizing Spectral Efficiency with Acceptable Service Provision in Multiple Antennas Scenarios. EW Francisco Rafael Marques Lima, Nibia Souza Bezerra, Ricardo B. dos Santos, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2011	—	`conf`	Blind Receiver for Multi-Layered Space-Frequency Coded MIMO Schemes Based on Temporally Extended Linear Constellation Precoding. VTC Fall André L. F. de Almeida, Walter C. Freitas Jr.
2011	B	`conf`	Hybrid space-time diversity and spatial-multiplexing MIMO cooperative scheme for wireless communication systems. PIMRC Daniel R. Furtado, F. Marcio Caldas, Walter C. Freitas Jr.
2010	—	`conf`	Joint Opportunistic Beamforming and Subcarrier Assignment for Maximization of User Satisfaction in OFDMA Systems. VTC Fall Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2010	B	`conf`	Overload Prediction Based on Delay in Wireless OFDMA Systems. GLOBECOM E. O. Lucena, Francisco Rafael Marques Lima, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2010	—	`conf`	Performance Evaluation for Resource Allocation Algorithms in CoMP Systems. VTC Fall Rodrigo L. Batista, Ricardo B. dos Santos, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2010	—	`conf`	Switching between Hybrid MIMO Structures for Video Transmission Based on Distortion Model. VTC Fall Martin B. Obando, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2007	B	`conf`	MIMO Transmit Structure Assignment with QoS Provision in Wireless Systems. PIMRC Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato Rocha Lopes
2007	B	`conf`	QoS based Radio Resource Allocation and Scheduling with Different User Data Rate Requirements for OFDMA Systems. PIMRC Ricardo B. dos Santos, Francisco Rafael Marques Lima, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
2006	B	`conf`	Hybrid MIMO Transceiver Scheme with Antenna Allocation and Partial CSI at Transmitter Side. PIMRC Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato Rocha Lopes
2004	—	`conf`	Performance of MIMO Antenna Systems with Hybrids of Transmit Diversity and Spatial Multiplexing Using Soft-Output Decoding. ICT Walter C. Freitas Jr., André L. F. de Almeida, João Cesar M. Mota, Francisco Rodrigo P. Cavalcanti, Raul L. de Lacerda Neto
2002	B	`conf`	BLAST/MIMO performance with space-time processing receivers. PIMRC Francisco Rodrigo P. Cavalcanti, André L. F. de Almeida, Carlos Estêvão R. Fernandes, Walter C. Freitas Jr.
2002	B	`conf`	Link performance evaluation for EGPRS with multiple antennas. PIMRC Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Charles Casimiro Cavalcante, Danilo Zanatta-Filho, André L. F. de Almeida