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ORCIDWalter C. Freitas Jr.
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- affiliation: Federal University of Ceará, Fortaleza, Brazil
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2020 – today
- 2023
[j24]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): 957-972 (2023)- [j23]Iran Mesquita Braga, Roberto P. Antonioli, Gábor Fodor, Yuri C. B. Silva, Walter da C. Freitas:
Efficient Battery Usage in Wireless-Powered Cell-Free Systems With Self-Energy Recycling. IEEE Trans. Veh. Technol. 72(5): 6856-6861 (2023) - [c31]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: 1068-1073 - 2022
- [j22]Iran Mesquita Braga, Roberto P. Antonioli, Gábor Fodor, Yuri C. B. Silva, Walter da C. Freitas:
Joint Pilot and Data Power Control Optimization in the Uplink of User-Centric Cell-Free Systems. IEEE Commun. Lett. 26(2): 399-403 (2022) - [j21]Juno V. Saraiva, Roberto P. Antonioli, Gábor Fodor, Iran Mesquita Braga, Walter da C. Freitas, Yuri C. B. Silva:
A Network-Assisted Game-Theoretic Design to Power Control in Autoregressive Fading Channels. IEEE Commun. Lett. 26(7): 1663-1667 (2022) - [j20]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): 8729-8743 (2022) - [c30]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: 1084-1089 - [i2]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 abs/2212.13950 (2022) - 2021
- [j19]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: 102916 (2021) - [j18]Juno Vitorino Saraiva, Francisco Rafael Marques Lima, Alexandre Matos Pessoa, Tarcisio Ferreira Maciel, Walter da Cruz Freitas Junior, Francisco Rodrigo Porto Cavalcanti:
Energy-efficient radio resource allocation for dual-hop relay-assisted orthogonal frequency division multiple access systems with quality of service provisioning. Trans. Emerg. Telecommun. Technol. 32(10) (2021) - [j17]Xi Han, Xinyuan Zhao, André L. F. de Almeida, Walter da C. Freitas, Wenle Bai:
Enhanced Tensor-Based Joint Channel and Symbol Estimation in Dual-Hop MIMO Relaying Systems. IEEE Commun. Lett. 25(5): 1655-1659 (2021) - [j16]Iran Mesquita Braga, Roberto Pinto Antonioli, Gábor Fodor, Yuri C. B. Silva, Carlos F. M. e Silva, Walter da C. Freitas:
Joint Resource Allocation and Transceiver Design for Sum-Rate Maximization Under Latency Constraints in Multicell MU-MIMO Systems. IEEE Trans. Commun. 69(7): 4569-4584 (2021) - [j15]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): 174-189 (2021) - 2020
- [j14]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): 2809-2813 (2020) - [j13]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): 377-389 (2020) - [c29]Lucas de S. Abdalah, Pedro Marinho R. de Oliveira, Walter da C. Freitas, Vicente Zarzoso:
Tensor-Based Noninvasive Atrial Fibrillation Complexity Index For Catheter Ablation. CinC 2020: 1-4 - [c28]Isac N. Lira, Pedro Marinho R. de Oliveira, Walter da C. Freitas, Vicente Zarzoso:
Automated Atrial Fibrillation Source Detection Using Shallow Convolutional Neural Networks. CinC 2020: 1-4 - [i1]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 abs/2003.02643 (2020)
2010 – 2019
- 2019
- [j12]Walter da C. Freitas, Gérard Favier, André L. F. de Almeida:
Tensor-Based Joint Channel and Symbol Estimation for Two-Way MIMO Relaying Systems. IEEE Signal Process. Lett. 26(2): 227-231 (2019) - [j11]Eduardo de Olivindo Cavalcante, Gábor Fodor, Yuri C. B. Silva, Walter da C. Freitas:
Bidirectional Sum-Power Minimization Beamforming in Dynamic TDD MIMO Networks. IEEE Trans. Veh. Technol. 68(10): 9988-10002 (2019) - [c27]Paulo R. B. Gomes, Gábor Fodor, Walter da C. Freitas, André L. F. de Almeida, Yuri C. B. Silva:
Tensor-Based Modeling and Processing for Channel Estimation in Two-Hop V2X MIMO Systems. CSCN 2019: 1-7 - [c26]Francisco R. V. Guimarães, Gábor Fodor, Walter da C. Freitas, Yuri C. B. Silva:
A Multi-Stream Pricing-Based Precoding and Power Control Algorithm for Dynamic TDD Networks. CSCN 2019: 1-6 - [c25]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: 1-7 - [c24]Walter da C. Freitas, Gérard Favier, André L. F. de Almeida, Martin Haardt:
Two-Way MIMO Decode-and-Forward Relaying Systems with Tensor Space-Time Coding. EUSIPCO 2019: 1-5 - 2018
- [j10]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: 19-31 (2018) - [j9]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): 3145-3157 (2018) - [j8]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): 11243-11247 (2018) - [j7]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): 320-323 (2018) - [j6]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): 788-791 (2018) - [c23]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: 1-6 - 2017
- [j5]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): 1773-1777 (2017) - [c22]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: 1-5 - [c21]Felipe G. A. e Silva, Otávio A. de Lima, Walter da C. Freitas, Fabian Vargas, Jarbas Silveira, César A. M. Marcon:
An efficient, low-cost ECC approach for critical-application memories. SBCCI 2017: 198-203 - 2015
- [c20]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: 1-5 - 2014
- [j4]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): 1215-1229 (2014) - [j3]Francisco Rafael Marques Lima, Tarcisio Ferreira Maciel, Walter Cruz Freitas Junior, Francisco Rodrigo Porto Cavalcanti:
Improved Spectral Efficiency With Acceptable Service Provision in Multiuser MIMO Scenarios. IEEE Trans. Veh. Technol. 63(6): 2697-2711 (2014) - [c19]Francisco M. C. Caldas, Daniel C. Araujo, Walter C. Freitas Jr.:
Hybrid MIMO schemes with MRT precoding and modified SIC receiver. LATINCOM 2014: 1-5 - [c18]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: 1-6 - 2013
- [c17]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: 1207-1211 - [c16]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: 2270-2275 - [c15]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: 1-5 - [c14]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: 1-5 - 2012
- [j2]Francisco Rafael Marques Lima, Tarcisio F. Maciel, Walter Cruz Freitas Junior, Francisco Rodrigo P. Cavalcanti:
Resource Assignment for Rate Maximization With QoS Guarantees in Multiservice Wireless Systems. IEEE Trans. Veh. Technol. 61(3): 1318-1332 (2012) - [c13]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 - 2011
- [c12]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: 1657-1661 - [c11]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: 1-5 - 2010
- [j1]Francisco Rafael Marques Lima, Stefan Wänstedt, Francisco Rodrigo P. Cavalcanti, Walter Cruz Freitas Junior:
Scheduling for Improving System Capacity in Multiservice 3GPP LTE. J. Electr. Comput. Eng. 2010: 819729:1-819729:16 (2010) - [c10]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: 1-5 - [c9]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: 1-5 - [c8]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: 1-5 - [c7]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: 1-5
2000 – 2009
- 2007
- [c6]Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato Rocha Lopes:
MIMO Transmit Structure Assignment with QoS Provision in Wireless Systems. PIMRC 2007: 1-5 - [c5]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: 1-5 - 2006
- [c4]Walter C. Freitas Jr., Francisco Rodrigo P. Cavalcanti, Renato Rocha Lopes:
Hybrid MIMO Transceiver Scheme with Antenna Allocation and Partial CSI at Transmitter Side. PIMRC 2006: 1-5 - 2004
- [c3]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: 28-37 - 2002
- [c2]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: 859-863 - [c1]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: 2092-2096
Coauthor Index
aka: André L. F. de Almeida
aka: Roberto Pinto Antonioli
aka: Francisco Rodrigo P. Cavalcanti
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