1 citations · 2 across the 9 of their papers we have counts for
10 papers
Joint Channel and Data Estimation for Multiuser Extremely Large-Scale MIMO Systems
Kabuto Arai, Koji Ishibashi, Hiroki Iimori +2
This paper proposes a joint channel and data estimation (JCDE) algorithm for uplink multiuser extremely large-scale multiple-input-multiple-output (XL-MIMO) systems. The initial ch…
Quantization-Aided Secrecy: FD C-RAN Communications with Untrusted Radios
Omid Taghizadeh, Tianyu Yang, Hiroki Iimori +3
In this work, we study a full-duplex (FD) cloud radio access network (C-RAN) from the aspects of infrastructure sharing and information secrecy, where the central unit utilizes FD…
Grant-Free Access via Bilinear Inference for Cell-Free MIMO with Low-Coherent Pilots
Hiroki Iimori, Takumi Takahashi, Koji Ishibashi +2
We propose a novel joint activity, channel, and data estimation (JACDE) scheme for cell-free multiple-input multiple-output (MIMO) systems compliant with fifth-generation (5G) new…
Full-Duplex Amplify-and-Forward MIMO Relaying: Impairments Aware Design and Performance Analysis
Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori +1
Full-Duplex (FD) Amplify-and-Forward (AF) Multiple-Input Multiple-Output (MIMO) relaying has been the focus of several recent studies, due to the potential for achieving a higher s…
Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
We consider a bidirectional in-band full-duplex (FD) multiple-input multiple-output (MIMO) system subject to imperfect channel state information (CSI), hardware distortion, and lim…
Discrete-Aware Matrix Completion via Proximal Gradient
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh +1
We present a novel algorithm for the completion of low-rank matrices whose entries are limited to a finite discrete alphabet. The proposed method is based on the recently-emerged p…
Robust Symbol Detection in Overloaded NOMA Systems
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Hara Takanori +5
We present a framework for the design of low-complexity and high-performance receivers for multidimensional overloaded NOMA systems. The framework is built upon a novel compressive…
Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA
Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi
We present a new Beamforming-based (BB) Multiple-Input Single-Output (MISO)-Non-orthogonal Multiple Access (NOMA) scheme for Power Domain NOMA (PD-NOMA), in which the total transmi…
A Frame-Theoretic Scheme for Robust Millimeter Wave Channel Estimation
Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, Hiroki Iimori
We propose a new scheme for the robust estimation of the millimeter wave (mmWave) channel. Our approach is based on a sparse formulation of the channel estimation problem coupled w…
Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees
Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos
We consider a bi-directional Full-Duplex (FD) Multiple-Input Multiple-Output (MIMO) communication system in which nodes are capable of performing transitter (TX)- Receiver (RX) dig…