Walter C. Freitas Jr.

Publication Activity (10 Years)

Years Active: 2002-2023
Publications (10 Years): 19

Top Topics

Space Time Block

Power Management

Wireless Networks

Top Venues

IEEE Trans. Veh. Technol.

IEEE Wirel. Commun. Lett.

Publications

Iran Mesquita Braga, Roberto Pinto Antonioli, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
Decentralized Joint Pilot and Data Power Control Based on Deep Reinforcement Learning for the Uplink of Cell-Free Systems. IEEE Trans. Veh. Technol. 72 (1) (2023)
Roberto P. Antonioli, Iran Mesquita Braga, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
Mixed Coherent and Non-Coherent Transmission for Multi-CPU Cell-Free Systems. ICC (2023)
Roberto Pinto Antonioli, Iran Mesquita Braga, Gábor Fodor, Yuri C. B. Silva, André L. F. de Almeida, Walter C. Freitas Jr.
On the Energy Efficiency of Cell-Free Systems With Limited Fronthauls: Is Coherent Transmission Always the Best Alternative? IEEE Trans. Wirel. Commun. 21 (10) (2022)
Juno V. Saraiva, Roberto P. Antonioli, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva
A Distributed Game-Theoretic Solution for Power Management in the Uplink of Cell-Free Systems. GLOBECOM (Workshops) (2022)
Roberto P. Antonioli, Iran M. Braga Jr., Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
Mixed Coherent and Non-Coherent Transmission for Multi-CPU Cell-Free Systems. CoRR (2022)
Juno Vitorino Saraiva, Roberto Pinto Antonioli, Gábor Fodor, Iran Mesquita Braga, Walter C. Freitas Jr., Yuri C. B. Silva, Carlos F. M. e Silva
Energy Efficiency Maximization Under Minimum Rate Constraints in Multi-Cell MIMO Systems With Finite Buffers. IEEE Trans. Green Commun. Netw. 5 (1) (2021)
Xi Han, Yingchun Zhou, André L. F. de Almeida, Walter C. Freitas Jr.
Semiblind Uni-ALS receiver for a two-way MIMO relaying system based on the PARATUCK2 model. Digit. Signal Process. 110 (2021)
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
Deep Reinforcement Learning for QoS-Constrained Resource Allocation in Multiservice Networks. CoRR (2020)
Iran M. Braga Jr., Eduardo de Olivindo Cavalcante, Gábor Fodor, Yuri C. B. Silva, Carlos F. M. e Silva, Walter C. Freitas Jr.
User Scheduling Based on Multi-Agent Deep Q-Learning for Robust Beamforming in Multicell MISO Systems. IEEE Commun. Lett. 24 (12) (2020)
Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., André L. F. de Almeida
Hybrid Analog-Digital Beamforming Design for SE and EE Maximization in Massive MIMO Networks. IEEE Trans. Veh. Technol. 69 (1) (2020)
A. Regilane L. Paiva, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva, Carlos F. M. e Silva
Kalman-Filter-Based Tracking of Millimeter-Wave Channel Parameters for V2X Applications. CSCN (2019)
Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
A Novel Cell Reconfiguration Technique for Dynamic TDD Wireless Networks. IEEE Wirel. Commun. Lett. 7 (3) (2018)
Walter C. Freitas Jr., Gérard Favier, André L. F. de Almeida
Generalized Khatri-Rao and Kronecker space-time coding for MIMO relay systems with closed-form semi-blind receivers. Signal Process. 151 (2018)
Laszlon R. Costa, Darlan C. Moreira, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rafael Marques Lima
User Grouping Based on Spatial Compatibility for Dynamic-TDD Cooperative Networks. GLOBECOM (2018)
Eduardo de Olivindo Cavalcante, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr.
Distributed Beamforming in Dynamic TDD MIMO Networks With BS to BS Interference Constraints. IEEE Wirel. Commun. Lett. 7 (5) (2018)
Francisco R. V. Guimarães, Gábor Fodor, Walter C. Freitas Jr., Yuri C. B. Silva
Pricing-Based Distributed Beamforming for Dynamic Time Division Duplexing Systems. IEEE Trans. Veh. Technol. 67 (4) (2018)
Khaled Ardah, Gábor Fodor, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
A Unifying Design of Hybrid Beamforming Architectures Employing Phase Shifters or Switches. IEEE Trans. Veh. Technol. 67 (11) (2018)
Walter C. Freitas Jr., Gérard Favier, André Lima Férrer de Almeida
Sequential Closed-Form Semiblind Receiver for Space-Time Coded Multihop Relaying Systems. IEEE Signal Process. Lett. 24 (12) (2017)
Khaled Ardah, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Gábor Fodor
An ADMM approach to distributed coordinated beamforming in dynamic TDD networks. CAMSAP (2017)
Khaled Ardah, Darlan C. Moreira, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Random Element Quantization for Finite Rate Feedback Systems. VTC Spring (2015)
Francisco M. C. Caldas, Daniel C. Araujo, Walter C. Freitas Jr.
Hybrid MIMO schemes with MRT precoding and modified SIC receiver. LATINCOM (2014)
Paulo G. Normando, Elvis Miguel Galeas Stancanelli, Yuri C. B. Silva, Walter C. Freitas Jr., Francisco Rodrigo Porto Cavalcanti
Performance of interference alignment techniques within CoMP-like systems. LATINCOM (2014)
Walter C. Freitas Jr., André L. F. de Almeida, João Paulo C. L. da Costa
Blind Joint Channel Estimation and Data Detection for Precoded Multi-Layered Space-Frequency MIMO Schemes. Circuits Syst. Signal Process. 33 (4) (2014)
Carlos Igor Ramos Bandeira, Darlan C. Moreira, Paulo G. Normando, Walter C. Freitas Jr., Yuri C. B. Silva, Francisco Rodrigo P. Cavalcanti
Performance of Joint Antenna and User Selection Schemes for Interference Alignment in MIMO Interference Channels. VTC Spring (2013)
Darlan C. Moreira, Paulo G. Normando, Carlos Igor Ramos Bandeira, Walter C. Freitas Jr., Yuri C. B. Silva, Francisco Rodrigo P. Cavalcanti
Block diagonalization with subspace based external interference mitigation. PIMRC (2013)
Walter C. Freitas Jr., Carlos Igor Ramos Bandeira, Francisco M. C. Caldas, Wilkinson T. F. Moura
A Modified Successive Interference Cancellation Algorithm for Hybrid Diversity/Spatial Multiplexing MIMO Schemes. VTC Spring (2013)
Elvis Miguel Galeas Stancanelli, Yuri C. B. Silva, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Clustering-based Assignment within CoMP systems. PIMRC (2013)
Francisco Rafael Marques Lima, Nibia Souza Bezerra, Ricardo B. dos Santos, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Maximizing Spectral Efficiency with Acceptable Service Provision in Multiple Antennas Scenarios. EW (2012)
André L. F. de Almeida, Walter C. Freitas Jr.
Blind Receiver for Multi-Layered Space-Frequency Coded MIMO Schemes Based on Temporally Extended Linear Constellation Precoding. VTC Fall (2011)
Daniel R. Furtado, F. Marcio Caldas, Walter C. Freitas Jr.
Hybrid space-time diversity and spatial-multiplexing MIMO cooperative scheme for wireless communication systems. PIMRC (2011)
Rodrigo L. Batista, Ricardo B. dos Santos, Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Performance Evaluation for Resource Allocation Algorithms in CoMP Systems. VTC Fall (2010)
E. O. Lucena, Francisco Rafael Marques Lima, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Overload Prediction Based on Delay in Wireless OFDMA Systems. GLOBECOM (2010)
Martin B. Obando, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Switching between Hybrid MIMO Structures for Video Transmission Based on Distortion Model. VTC Fall (2010)
Tarcisio F. Maciel, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
Joint Opportunistic Beamforming and Subcarrier Assignment for Maximization of User Satisfaction in OFDMA Systems. VTC Fall (2010)
Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato R. Lopes
MIMO Transmit Structure Assignment with QoS Provision in Wireless Systems. PIMRC (2007)
Ricardo B. dos Santos, Francisco Rafael Marques Lima, Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti
QoS based Radio Resource Allocation and Scheduling with Different User Data Rate Requirements for OFDMA Systems. PIMRC (2007)
Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato R. Lopes
Hybrid MIMO Transceiver Scheme with Antenna Allocation and Partial CSI at Transmitter Side. PIMRC (2006)
Walter C. Freitas Jr., André L. F. de Almeida, João Cesar M. Mota, Francisco Rodrigo P. Cavalcanti, Raul L. de Lacerda Neto
Performance of MIMO Antenna Systems with Hybrids of Transmit Diversity and Spatial Multiplexing Using Soft-Output Decoding. ICT (2004)
Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Charles Casimiro Cavalcante, Danilo Zanatta-Filho, André L. F. de Almeida
Link performance evaluation for EGPRS with multiple antennas. PIMRC (2002)
Francisco Rodrigo P. Cavalcanti, André L. F. de Almeida, Carlos Estêvão R. Fernandes, Walter C. Freitas Jr.
BLAST/MIMO performance with space-time processing receivers. PIMRC (2002)