154 citations · 1.1k across the 115 of their papers we have counts for
90 papers · 1 filter
Low-Latency LDPC Decoding Based on Consensus and Return Residual Belief Propagation
Allan E. Feitosa, Rodrigo C. de Lamare
We propose two new decoding algorithms for low-density parity-check (LDPC) codes. The Consensus and Return residual belief propagation (C&R-RBP) algorithm reduces the number of ite…
Study of Iterative Detection and Decoding for {Mixed Near- and Far-Field} XL-MIMO Systems
Nayyab Haider, Rodrigo C. de Lamare
Extra-large multiple-input multiple-output (XL-MIMO) systems {serving users across near-field and far-field regions} experience spherical wavefront propagation that provides enhanc…
Study of Multiuser Scheduling Based on User Satisfaction for MU-MIMO Systems
Ahmed M. Nor, Lukas T. N. Landau, E. Veronica Belmega +1
Scheduling in multiuser multiple input multiple output (MU-MIMO) systems is essential for efficient resource allocation and overall performance enhancement. In this work, a multius…
Study of Mixed-Integer Optimization Based on Graph-Based Decomposition for Cell-Free Networks
Julio Cesar Cardoso Tesolin, Rodrigo C. de Lamare
This letter develops a radio access network (RAN) framework for mixed discrete-continuous optimization problems that arise in user-centric cell=free massive multiple-antenna networ…
Study of Graph-Based Search for Energy-Efficient Clustering in Cell-Free Massive MIMO Networks
Julio Cesar Cardoso Tesolin, Rodrigo C. de Lamare
This paper investigates energy-efficient clustering in user-centric cell-free massive MIMO networks, addressing the access point clustering and power allocation problems via a mixe…
Study of Code-Aided Channel Estimation for Metasurface-Based Holographic MIMO Systems
Roberto C. G. Porto, Rodrigo C. de Lamare
This work proposes an iterative code-aided detection, decoding, and channel estimation scheme for metasurface-based holographic MIMO systems employing stacked intelligent metasurfa…
Study of Clustered Robust Linear Precoding for Cell-Free MU-MIMO Networks
A. Flores, R. de Lamare
Precoding techniques are key to dealing with multiuser interference in the downlink of cell-free (CF) multiple-input multiple-output systems. However, these techniques rely on accu…
Decentralized and Centralized IDD Schemes for Cell-Free Networks
T. Ssettumba, Z. Shao, L. Landau +1
In this paper, we propose iterative interference cancellation schemes with access points selection (APs-Sel) for cell-free massive multiple-input multiple-output (CF-mMIMO) systems…
Iterative Detection and Decoding Schemes with LLR Refinements in Cell-Free Massive MIMO Networks
T. Ssettumba, Z. Shao, L. Landau +1
In this paper, we propose low-complexity local detectors and log-likelihood ratio (LLR) refinement techniques for a coded cell-free massive multiple input multiple output (CF- mMIM…
Study of Clustering Techniques and Scheduling Algorithms with Fairness for Cell-Free MIMO Networks
S. Mashdour, R. C. de Lamare
In this work, we propose a clustering technique based on information rates for cell-free massive multiple-input multiple-output (MIMO) networks. Unlike existing clustering approach…
Study of Adaptive Reweighted Sparse Belief Propagation Decoders for Polar Codes
R. M. Oliveira, R. C. de Lamare
In this paper, we present an adaptive reweighted sparse belief propagation (AR-SBP) decoder for polar codes. The AR-SBP technique is inspired by decoders that employ the sum-produc…
Study of Noncoherent Sparse Subarrays for Direction Finding Based on Low-Rank and Sparse Recovery
W. Leite, R. C. de Lamare
This paper investigates the problem of noncoherent direction-of-arrival (DOA) estimation using different sparse subarrays. In particular, we present a Multiple Measurements Vector…
Study of Adaptive LLR-based AP selection for Grant-Free Random Access in Cell-Free Networks
R. Di Renna, R. C. de Lamare
This paper presents an iterative detection and decoding scheme along with an adaptive strategy to improve the selection of access points (APs) in a grant-free uplink cell-free scen…
Tomlinson-Harashima Cluster-Based Precoders for Cell-Free MU-MIMO Networks
A. Flores, R. C. de Lamare, K. V. Mishra
Cell-free (CF) multiple-input multiple-output (MIMO) systems generally employ linear precoding techniques to mitigate the effects of multiuser interference. However, the power loss…
Study of Iterative Detection and Decoding with Log-Likelihood Ratio Based Access Point Selection for Cell-Free Networks
R. B. Di Renna, R. C. de Lamare
This paper proposes an iterative detection and decoding (IDD) scheme and an approach to improve the selection of access points (APs) in uplink cell-free massive multiple-antenna sy…
Sequential Multiuser Scheduling and Power Allocation for Cell-Free Multiple-Antenna Networks
S. Mashdour, A. Schmeink, R. C. de Lamare +1
Resource allocation is a fundamental task in cell-free (CF) massive multi-input multi-output (MIMO) systems, which can effectively improve the network performance. In this paper, w…
Study of Multiuser Multiple-Antenna Wireless Communications Systems Based on Super-Resolution Arrays
S. Pinto, R. C. de Lamare
This work studies multiple-antenna wireless communication systems based on super-resolution arrays (SRAs). We consider the uplink of a multiple-antenna system in which users commun…
Joint Visibility Region and Channel Estimation for Extremely Large-scale MIMO Systems
Anzheng Tang, Jun-bo Wang, Yijin Pan +5
In this work, we investigate the joint visibility region (VR) detection and channel estimation (CE) problem for extremely large-scale multiple-input-multiple-output (XL-MIMO) syste…
Study of Robust Adaptive Beamforming Algorithms Based on Power Method Processing and Spatial Spectrum Matching
S. Mohammadzadeh, V. H. Nascimento, R. C. de Lamare +1
Robust adaptive beamforming (RAB) based on interference-plus-noise covariance (INC) matrix reconstruction can experience performance degradation when model mismatch errors exist, p…
Clustered Cell-Free Multi-User MIMO Systems with Rate-Splitting
A. Flores, R. C. de Lamare, K. V. Mishra
In this paper, we address two crucial challenges in the design of cell-free (CF) systems: degradation in the performance of CF systems by imperfect channel state information at the…
Study of Enhanced Subset Greedy Multiuser Scheduling for Cell-Free Massive MIMO Systems
S. Mashdour, R. C. de Lamare, J. P. Sales
In this work, we consider the problem of multiuser scheduling for the downlink of cell-free massive multi-input multi-output networks with clustering. In particular, we develop a m…
List-Based Detection and Selection of Access Points in Cell-Free Massive MIMO Networks
T. Ssettumba, L. T. N. Landau, R. C. de Lamare
This paper proposes a cell-free massive multiple-input multiple-output (CF-mMIMO) architecture with joint list-based detection with soft interference cancelation (soft-IC) and acce…
Study of Multiuser Scheduling with Enhanced Greedy Techniques for Multicell and Cell-Free Massive MIMO Networks
S. Mashdour, R. C. de Lamare, J. P. Sales
In this work, we investigate the sum-rate performance of multicell and cell-free massive MIMO systems using linear precoding and multiuser scheduling algorithms. We consider the us…
Study of Robust Adaptive Power Allocation Techniques for Rate Splitting based MU-MIMO systems
A. R. Flores, R. C. de Lamare
Rate splitting (RS) systems can better deal with imperfect channel state information at the transmitter (CSIT) than conventional approaches. However, this requires an appropriate p…