Vishnu V. Ratnam

35 papers B 6Misc 2Journal 24Unranked 3
YearRankTypeTitle / Venue / Authors
2025 J jnl
Measurement Based Delay and Jitter Constrained Wireless Scheduling With Near-Optimal Spectral Efficiency.
IEEE Trans. Netw.
Geetha Chandrasekaran, Gustavo de Veciana, Vishnu V. Ratnam, Hao Chen, Charlie Zhang
2025 J jnl
Multi-Device Experience With Peer-to-Peer Connectivity in IEEE 802.11bn (Wi-Fi 8).
IEEE J. Sel. Areas Commun.
Rubayet Shafin Bradley Shafin, Iñaki Val, Yue Qi, Peshal Nayak, Vishnu V. Ratnam, Bilal Sadiq, Sigurd Schelstraete, Marcos Martínez, Boon Loong Ng
2025 J jnl
O-RAN-Enabled Intelligent Network Slicing to Meet Service-Level Agreement (SLA).
IEEE Trans. Mob. Comput.
Jiongyu Dai, Lianjun Li, Ramin Safavinejad, Shadab Mahboob, Hao Chen, Vishnu V. Ratnam, Haining Wang, Jianzhong Zhang, Lingjia Liu
2024 Misc conf
Multi-Person Respiration Rate Estimation With Single Pair Of Transmit And Receive Antenna.
ICASSP
Hao-Hsuan Chang, Vishnu V. Ratnam, Hao Chen, Junsu Choi, Charlie Jianzhong Zhang
2024 J jnl
Optimal Preprocessing of WiFi CSI for Sensing Applications.
IEEE Trans. Wirel. Commun.
Vishnu V. Ratnam, Hao Chen, Hao-Hsuan Chang, Abhishek Sehgal, Charlie Zhang
2024 J jnl
WiDRa - Enabling Millimeter-Level Differential Ranging Accuracy in Wi-Fi Using Carrier Phase.
CoRR
Vishnu V. Ratnam, Bilal Sadiq, Hao Chen, Wei Sun, Shunyao Wu, Boon Loong Ng, Jianzhong Zhang
2024 J jnl
WiDRa: Enabling Millimeter-Level Differential Ranging Accuracy in Wi-Fi Using Carrier Phase.
IEEE J. Sel. Areas Commun.
Vishnu V. Ratnam, Bilal Sadiq, Hao Chen, Wei Sun, Shunyao Wu, Boon Loong Ng, Jianzhong Zhang
2023 B conf
Delay and Jitter Constrained Wireless Scheduling with Near-Optimal Spectral Efficiency.
PIMRC
Geetha Chandrasekaran, Gustavo de Veciana, Vishnu V. Ratnam, Hao Chen, Charlie Zhang
2023 J jnl
Joint Phase-Time Arrays: A Paradigm for Frequency-Dependent Analog Beamforming in 6G.
CoRR
Vishnu V. Ratnam, Jianhua Mo, Ahmad AlAmmouri, Boon Loong Ng, Jianzhong Zhang, Andreas F. Molisch
2023 J jnl
Optimal preprocessing of WiFi CSI for sensing applications.
CoRR
Vishnu V. Ratnam, Hao Chen, Hao-Hsuan Chang, Abhishek Sehgal, Jianzhong Zhang
2023 B conf
Spectrally Efficient Guaranteed Rate Scheduling for Heterogeneous QoS Constrained Wireless Networks.
WiOpt
Geetha Chandrasekaran, Gustavo de Veciana, Vishnu V. Ratnam, Hao Chen, Jianzhong Zhang
2022 J jnl
Extending Uplink Coverage of mmWave and Terahertz Systems Through Joint Phase-Time Arrays.
IEEE Access
Ahmad AlAmmouri, Jianhua Mo, Vishnu V. Ratnam, Boon Loong Ng, Robert W. Heath Jr., Juho Lee, Jianzhong Zhang
2022 J jnl
Joint Phase-Time Arrays: A Paradigm for Frequency-Dependent Analog Beamforming in 6G.
IEEE Access
Vishnu V. Ratnam, Jianhua Mo, Ahmad AlAmmouri, Boon Loong Ng, Jianzhong Zhang, Andreas F. Molisch
2021 J jnl
FadeNet: Deep Learning-Based mm-Wave Large-Scale Channel Fading Prediction and its Applications.
IEEE Access
Vishnu V. Ratnam, Hao Chen, Sameer Pawar, Bingwen Zhang, Charlie Jianzhong Zhang, Young-Jin Kim, Soonyoung Lee, Minsung Cho, Sung-Rok Yoon
2020 J jnl
Performance of Analog Beamforming Systems With Optimized Phase Noise Compensation.
IEEE Trans. Signal Process.
Vishnu V. Ratnam
2019 J jnl
Continuous Analog Channel Estimation Aided Beamforming for Massive MIMO Systems.
CoRR
Vishnu V. Ratnam, Andreas F. Molisch
2019 J jnl
Continuous Analog Channel Estimation-Aided Beamforming for Massive MIMO Systems.
IEEE Trans. Wirel. Commun.
Vishnu V. Ratnam, Andreas F. Molisch
2019 J jnl
Coordinated Dynamic Spectrum Sharing for 5G and Beyond Cellular Networks.
IEEE Access
Jeongho Jeon, Russell D. Ford, Vishnu V. Ratnam, Joonyoung Cho, Jianzhong Zhang
2019 B conf
Coordinated Spectrum Sharing Framework for beyond 5G Cellular Networks.
GLOBECOM
Jeongho Jeon, Russell D. Ford, Vishnu V. Ratnam, Joonyoung Cho, Jianzhong Zhang
2019 J jnl
Optimal Reference Signal Design for Phase Noise Compensation in Multi-carrier Massive MIMO Systems.
CoRR
Vishnu V. Ratnam
2019 J jnl
Periodic Analog Channel Estimation Aided Beamforming for Massive MIMO Systems.
CoRR
Vishnu V. Ratnam, Andreas F. Molisch
2019 J jnl
Periodic Analog Channel Estimation Aided Beamforming for Massive MIMO Systems.
IEEE Trans. Wirel. Commun.
Vishnu V. Ratnam, Andreas F. Molisch
2018 J jnl
Hybrid Beamforming With Selection for Multiuser Massive MIMO Systems.
IEEE Trans. Signal Process.
Vishnu V. Ratnam, Andreas F. Molisch, Ozgun Y. Bursalioglu, Haralabos C. Papadopoulos
2018 B conf
Multi-Antenna FSR Receivers: Low Complexity, Non-Coherent, Massive Antenna Receivers.
GLOBECOM
Vishnu V. Ratnam, Andreas F. Molisch
2018 — conf
Reference Tone Aided Transmission for Massive MIMO: Analog Beamforming without CSI.
ICC
Vishnu V. Ratnam, Andreas F. Molisch
2017 B conf
Bit and Power Allocation in QAM Capable Multi-Differential Frequency-Shifted Reference UWB Radio.
GLOBECOM
Vishnu V. Ratnam, Andreas F. Molisch, Amr Alasaad, Faisal Alawwad, Hatim M. Behairy
2017 J jnl
Hybrid Beamforming for Massive MIMO: A Survey.
IEEE Commun. Mag.
Andreas F. Molisch, Vishnu V. Ratnam, Shengqian Han, Zheda Li, Sinh Le Hong Nguyen, Linsheng Li, Katsuyuki Haneda
2017 J jnl
Hybrid Beamforming with Selection for Multi-user Massive MIMO Systems.
CoRR
Vishnu V. Ratnam, Andreas F. Molisch, Ozgun Y. Bursalioglu, Haralabos C. Papadopoulos
2017 — conf
Preprocessor design for hybrid preprocessing with selection in massive MISO systems.
ICC
Vishnu V. Ratnam, Ozgun Y. Bursalioglu, Haralabos C. Papadopoulos, Andreas F. Molisch
2016 J jnl
Capacity Analysis of Interlaced Clustering in a Distributed Transmission System With/Without CSIT.
IEEE Trans. Wirel. Commun.
Vishnu V. Ratnam, Andreas F. Molisch, Giuseppe Caire
2016 B conf
Diversity versus Training Overhead Trade-Off for Low Complexity Switched Transceivers.
GLOBECOM
Vishnu V. Ratnam, Andreas F. Molisch, Naif Rabeah, Faisal Alawwad, Hatim M. Behairy
2016 J jnl
Hybrid Beamforming for Massive MIMO - A Survey.
CoRR
Andreas F. Molisch, Vishnu V. Ratnam, Shengqian Han, Zheda Li, Sinh Le Hong Nguyen, Linsheng Li, Katsuyuki Haneda
2016 J jnl
MIMO Systems With Restricted Pre/Post-Coding - Capacity Analysis Based on Coupled Doubly Correlated Wishart Matrices.
IEEE Trans. Wirel. Commun.
Vishnu V. Ratnam, Andreas F. Molisch, Haralabos C. Papadopoulos
2015 — conf
Capacity analysis of interlaced clustering in a distributed antenna system.
ICC
Vishnu V. Ratnam, Giuseppe Caire, Andreas F. Molisch
2012 Misc conf
Jointly cooperative decode-and-forward relaying for secondary spectrum access.
CISS
Songze Li, Urbashi Mitra, Vishnu V. Ratnam, Ashish Pandharipande