154 citations · 1.1k across the 115 of their papers we have counts for
28 papers · 1 filter
Coordinate Tomlinson-Harashima Precoding Design for Overloaded Multi-user MIMO Systems
K. Zu, R. C. de Lamare
Tomlinson-Harashima precoding (THP) is a nonlinear processing technique employed at the transmit side to implement the concept of dirty paper coding (DPC). The perform of THP, howe…
Multi-User Flexible Coordinated Beamforming using Lattice Reduction for Massive MIMO Systems
K. Zu, R. C. de Lamare
The application of precoding algorithms in multi-user massive multiple-input multiple-output (MU-Massive-MIMO) systems is restricted by the dimensionality constraint that the numbe…
Robust MMSE Precoding for Multiuser MIMO Relay Systems using Switched Relaying and Side Information
Y. Cai, R. C. de Lamare, L. L. Yang +1
This study proposes a novel precoding scheme for multiuser multiple-input multiple-output (MIMO) relay systems in the presence of imperfect channel state information (CSI). The bas…
Adaptive Delay-Tolerant DSTBC in Opportunistic Relaying Cooperative MIMO Systems
T. Peng, R. C. de Lamare
An adaptive delay-tolerant distributed space-time coding (DSTC) scheme with feedback is proposed for two-hop cooperative multiple-input multiple-output (MIMO) networks using an amp…
Multi-Branch Lattice-Reduction SIC for Multiuser MIMO Systems
L. Arevalo, R. C. de Lamare, R. Sampaio-Neto
In this paper, we propose a new detection technique for multiuser multiple-input multiple-output (MU-MIMO) systems. The proposed scheme combines a lattice reduction (LR) transforma…
Blind Adaptive MIMO Receivers for CDMA Systems with Space-Time Block-Codes and Low-Cost Algorithms
R. C. de Lamare, R. Sampaio-Neto
In this paper we present low-complexity blind multi-input multi-output (MIMO) adaptive linear multiuser receivers for direct sequence code division multiple access (DS-CDMA) system…
Joint SIC and Relay Selection for Cooperative DS-CDMA Systems
J. Gu, R. C. de Lamare
In this work, we propose a cross-layer design strategy based on a joint successive interference cancellation (SIC) detection technique and a multi-relay selection algorithm for the…
Robust Multi-Branch Tomlinson-Harashima Precoding in Cooperative MIMO Relay Systems
L. Zhang, Y. Cai, R. C. de Lamare +1
This paper proposes the design of robust transceivers with Tomlinson-Harashima precoding (THP) for multiple-input multiple-output (MIMO) relay systems with amplify-and-forward (AF)…
Detection and Estimation Algorithms in Massive MIMO Systems
R. C. de Lamare, R. Sampaio Neto
This book chapter reviews signal detection and parameter estimation techniques for multiuser multiple-antenna wireless systems with a very large number of antennas, known as massiv…
Rate-Compatible LDPC Codes Based on Puncturing and Extension Techniques for Short Block Lengths
J. Liu, R. C. de Lamare
In this paper, we investigate novel strategies for generating rate-compatible (RC) irregular low-density parity-check (LDPC) codes with short/moderate block lengths. We propose thr…
Multiple-Candidate Successive Interference Cancellation with Widely-Linear Processing for MAI and Jamming Suppression in DS-CDMA Systems
J. Yang, R. C. de Lamare
In this paper, we propose a widely-linear (WL) receiver structure for multiple access interference (MAI) and {jamming signal (JS)} suppression in direct-sequence code-division mult…
Low-Complexity Variable Forgetting Factor Constrained Constant Modulus RLS Algorithm for Adaptive Beamforming
Q. Boya, Y. Cai, B. Champagne +2
In this paper, a recursive least squares (RLS) based blind adaptive beamforming algorithm that features a new variable forgetting factor (VFF) mechanism is presented. The beamforme…
Successive Optimization Tomlinson-Harashima Precoding Strategies for Physical-Layer Security in Wireless Networks
X. Luo, R. C. de Lamare, K. Zu
In this paper, we propose successive optimization non-linear precoding strategies for physical-layer security in wireless networks. We also investigate different precoding techniqu…
Joint PIC and relay selection based on greedy techniques for cooperative DS-CDMA systems
J. Gu, R. C. de Lamare
In this work, we propose a cross-layer design strategy based on the parallel interference cancellation (PIC) detection technique and a multi-relay selection algorithm for the uplin…
Sparsity-Aware Filtered-X Affine Projection Algorithms for Active Noise Control
A. Gully, R. C. de Lamare
This paper describes a novel technique for promoting sparsity in the modified filtered-x algorithms required for active noise control. The proposed algorithms are based on recent t…
Adaptive Delay-Tolerant Distributed Space-Time Coding Based on Adjustable Code Matrices for Cooperative MIMO Relaying Systems
Tong Peng, Rodrigo C. de Lamare
An adaptive delay-tolerant distributed space-time coding (DSTC) scheme that exploits feedback is proposed for two-hop cooperative MIMO networks. Maximum likelihood (ML) receivers a…
Alternating Optimization Techniques for Power Allocation and Receiver Design in Multihop Wireless Sensor Networks
Tong Wang, Rodrigo C. de Lamare, Anke Schmeink
In this paper, we consider a multihop wireless sensor network with multiple relay nodes for each hop where the amplify-and-forward scheme is employed. We present algorithmic strate…
Iterative Detection and LDPC Decoding Algorithms for MIMO Systems in Block-Fading Channels
A. G. D. Uchoa, C. T. Healy, R. C. de Lamare +1
We propose an Iterative Detection and Decoding (IDD) scheme with Low Density Parity Check (LDPC) codes for Multiple Input Multiple Output (MIMO) systems for block-fading an…
Knowledge-Aided Reweighted Belief Propagation LDPC Decoding using Regular and Irregular Designs
J. Li, R. C. de Lamare
In this paper a new message passing algorithm, which takes advantage of both tree-based re-parameterization and the knowledge of short cycles, is introduced for the purpose of deco…
Set-Membership Adaptive Constant Modulus Algorithm with a Generalized Sidelobe Canceler and Dynamic Bounds for Beamforming
Yunlong Cai, Rodrigo C. de Lamare, Minjian Zhao
In this work, we propose an adaptive set-membership constant modulus (SM-CM) algorithm with a generalized sidelobe canceler (GSC) structure for blind beamforming. We develop a stoc…
Locally-Optimized Reweighted Belief Propagation for Decoding LDPC Codes with Finite-Length
J. Li, R. C. de Lamare, H. Wymeersch
In practice, LDPC codes are decoded using message passing methods. These methods offer good performance but tend to converge slowly and sometimes fail to converge and to decode the…
Repeat Accumulate Based Designs for LDPC Codes on Fading Channels
A. G. D. Uchoa, C. T. Healy, R. C. de Lamare
Irregular repeat-accumulate Root-Check LDPC codes based on Progressive Edge Growth (PEG) techniques for block-fading channels are proposed. The proposed Root-Check LDPC codes are {…
Data-Adaptive Reduced-Dimension Robust Beamforming Algorithms
S. Somasundaram, P. Li, N. Parsons +1
We present low complexity, quickly converging robust adaptive beamformers that combine robust Capon beamformer (RCB) methods and data-adaptive Krylov subspace dimensionality reduct…
Direction Finding Algorithms with Joint Iterative Subspace Optimization
L. Wang, R. C. de Lamare, M. Haardt
In this paper, a reduced-rank scheme with joint iterative optimization is presented for direction of arrival estimation. A rank-reduction matrix and an auxiliary reduced-rank param…