221 citations · 988 across the 21 of their papers we have counts for
26 papers
PolarDenseNet: A Deep Learning Model for CSI Feedback in MIMO Systems
Pranav Madadi, Jeongho Jeon, Joonyoung Cho +3
In multiple-input multiple-output (MIMO) systems, the high-resolution channel information (CSI) is required at the base station (BS) to ensure optimal performance, especially in th…
Robust Non-Coherent Beamforming for FDD Downlink Massive MIMO
François Rottenberg, Ming-Chun Lee, Thomas Choi +2
Designing beamforming techniques for the downlink (DL) of frequency division duplex (FDD) massive MIMO is known to be a challenging problem due to the difficulty of obtaining chann…
RCNet: Incorporating Structural Information into Deep RNN for MIMO-OFDM Symbol Detection with Limited Training
Zhou Zhou, Lingjia Liu, Shashank Jere +3
In this paper, we investigate learning-based MIMO-OFDM symbol detection strategies focusing on a special recurrent neural network (RNN) -- reservoir computing (RC). We first introd…
Grip-Aware Analog mmWave Beam Codebook Adaptation for 5G Mobile Handsets
Ahmad AlAmmouri, Jianhua Mo, Boon Loong Ng +2
This paper studies the effect of the user hand grip on the design of beamforming codebooks for 5G millimeter-wave (mmWave) mobile handsets. The high-frequency structure simulator (…
Channel Extrapolation for FDD Massive MIMO: Procedure and Experimental Results
Thomas Choi, François Rottenberg, Jorge Gomez-Ponce +4
Application of massive multiple-input multiple-output (MIMO) systems to frequency division duplex (FDD) is challenging mainly due to the considerable overhead required for downlink…
Artificial Intelligence-Enabled Cellular Networks: A Critical Path to Beyond-5G and 6G
Rubayet Shafin, Lingjia Liu, Vikram Chandrasekhar +4
Mobile Network Operators (MNOs) are in process of overlaying their conventional macro cellular networks with shorter range cells such as outdoor pico cells. The resultant increase…
Self-Tuning Sectorization: Deep Reinforcement Learning Meets Broadcast Beam Optimization
Rubayet Shafin, Hao Chen, Young Han Nam +6
Beamforming in multiple input multiple output (MIMO) systems is one of the key technologies for modern wireless communication. Creating appropriate sector-specific broadcast beams…
Channel Correlation Diversity in MU-MIMO Systems -- Analysis and Measurements
Harsh Tataria, Seun Sangodoyin, Andreas F. Molisch +4
In multiuser multiple-input multiple-output (MU-MIMO) systems, channel correlation is detrimental to system performance. We demonstrate that widely used, yet overly simplified, cor…
How Many Antennas Do We Need for Massive MIMO Channel Sounding? - Validating Through Measurement
Thomas Choi, François Rottenberg, Peng Luo +2
This paper investigates the impact of the number of antennas (8 to 64) and the array configuration on massive MIMO channel parameters estimation for multiple propagation scenarios…
Channel Extrapolation in FDD Massive MIMO: Theoretical Analysis and Numerical Validation
François Rottenberg, Rui Wang, Jianzhong Zhang +1
Downlink channel estimation in massive MIMO systems is well known to generate a large overhead in frequency division duplex (FDD) mode as the amount of training generally scales wi…
Enable Super-resolution Parameter Estimation for Mm-wave Channel Sounding
Rui Wang, C. Umit Bas, Zihang Cheng +14
This paper investigates the capability of millimeter-wave (mmWave) channel sounders with phased arrays to perform super-resolution parameter estimation, i.e., determine the paramet…
Distributive Dynamic Spectrum Access through Deep Reinforcement Learning: A Reservoir Computing Based Approach
Hao-Hsuan Chang, Hao Song, Yang Yi +3
Dynamic spectrum access (DSA) is regarded as an effective and efficient technology to share radio spectrum among different networks. As a secondary user (SU), a DSA device will fac…
28 GHz Microcell Measurement Campaign for Residential Environment
C. Umit Bas, Rui Wang, Seun Sangodoyin +5
This paper presents results from the (to our knowledge) first double-directionally resolved measurement campaign at mm-wave frequencies in a suburban microcell. The measurements ar…
Dynamic Double Directional Propagation Channel Measurements at 28 GHz
C. Umit Bas, Rui Wang, Seun Sangodoyin +5
This paper presents results from the (to our knowledge) first dynamic double-directionally resolved measurement campaign at mm-wave frequencies for an outdoor microcellular scenari…
Outdoor to Indoor Penetration Loss at 28 GHz for Fixed Wireless Access
C. Umit Bas, Rui Wang, Thomas Choi +5
This paper present the results from a 28 GHz channel sounding campaign performed to investigate the effects of outdoor to indoor penetration on the wireless propagation channel cha…
Stationarity Region of Mm-Wave Channel Based on Outdoor Microcellular Measurements at 28 GHz
R. Wang, C. U. Bas, S. Sangodoyin +4
The stationarity region, i.e., the area in which the statistics of a propagation channel remain constant, is an important measure of the propagation channel, and essential for effi…
Directional Cell Search Delay Analysis for Cellular Networks with Static Users
Yingzhe Li, Francois Baccelli, Jeffrey G. Andrews +1
Cell search is the process for a user to detect its neighboring base stations (BSs) and make a cell selection decision. Due to the importance of beamforming gain in millimeter wave…
Distributed FD-MIMO: Cellular Evolution for 5G and Beyond
Yeqing Hu, Boon Loong Ng, Young-Han Nam +5
This paper presents the next evolution of FD-MIMO technology for beyond 5G, where antennas of the FD-MIMO system are placed in a distributed manner throughout the cell in a multi-c…
A Real-Time Millimeter-Wave Phased Array MIMO Channel Sounder
C. Umit Bas, Rui Wang, Dimitris Psychoudakis +5
In this paper, we present a novel real-time MIMO channel sounder for 28 GHz. Until now, the common practice to investigate the directional characteristics of millimeter-wave channe…
Indoor 5G 3GPP-like Channel Models for Office and Shopping Mall Environments
Katsuyuki Haneda, Lei Tian, Henrik Asplund +25
Future mobile communications systems are likely to be very different to those of today with new service innovations driven by increasing data traffic demand, increasing processing…
Initial Beam Association in Millimeter Wave Cellular Systems: Analysis and Design Insights
Ahmed Alkhateeb, Young-Han Nam, Md Saifur Rahman +2
Enabling the high data rates of millimeter wave (mmWave) cellular systems requires deploying large antenna arrays at both the basestations and mobile users. The beamforming weights…
Massive MIMO Combining with Switches
Ahmed Alkhateeb, Young-Han Nam, Jianzhong Zhang +1
Massive multiple-input multiple-output (MIMO) is expected to play a central role in future wireless systems. The deployment of large antenna arrays at the base station and the mobi…
Overview of Full-Dimension MIMO in LTE-Advanced Pro
Hyoungju Ji, Younsun Kim, Juho Lee +5
Multiple-input multiple-output (MIMO) systems with a large number of basestation antennas, often called massive MIMO, have received much attention in academia and industry as a mea…
Modeling and Analyzing the Coexistence of Wi-Fi and LTE in Unlicensed Spectrum
Yingzhe Li, Francois Baccelli, Jeffrey G. Andrews +2
We leverage stochastic geometry to characterize key performance metrics for neighboring Wi-Fi and LTE networks in unlicensed spectrum. Our analysis focuses on a single unlicensed f…