154 citations · 1.1k across the 115 of their papers we have counts for
15 papers · 1 filter
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…
Study of Enhanced MISC-Based Sparse Arrays with High uDOFs and Low Mutual Coupling
X. Sheng, D. Lu, Y. Li +1
In this letter, inspired by the maximum inter-element spacing (IES) constraint (MISC) criterion, an enhanced MISC-based (EMISC) sparse array (SA) with high uniform degrees-of-freed…
Efficient Covariance Matrix Reconstruction with Iterative Spatial Spectrum Sampling
S. Mohammadzadeh, V. H. Nascimento, R. C. de Lamare +1
This work presents a cost-effective technique for designing robust adaptive beamforming algorithms based on efficient covariance matrix reconstruction with iterative spatial power…
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 Robust Adaptive Beamforming with Covariance Matrix Reconstruction Based on Power Spectral Estimation and Uncertainty Region
S. Mohammadzadeh, V. H. Nascimento, R. C. de Lamare +1
In this work, a simple and effective robust adaptive beamforming technique is proposed for uniform linear arrays, which is based on the power spectral estimation and uncertainty re…
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…
State Machine-based Waveforms for Channels With 1-Bit Quantization and Oversampling With Time-Instance Zero-Crossing Modulation
Diana M. V. Melo, Lukas T. N. Landau, Rodrigo C. de Lamare
Systems with 1-bit quantization and oversampling are promising for the Internet of Things (IoT) devices in order to reduce the power consumption of the analog-to-digital-converters…