11 papers
Communication in a Fractional World: MIMO MC-OTFS Precoder Prediction
Evan Allen, Karim Said, Robert Calderbank +1
As 6G technologies advance, international bodies and regulatory agencies are intensifying efforts to extend seamless connectivity especially for high-mobility scenarios such as Mob…
Spreading over OFDM for Integrated Sensing and Communications (ISAC) Ranging: Multi-user Interference Mitigation
Karim A. Said, Ibraheem Alturki, Husheng Li +2
In the context of communication-centric integrated sensing and communication (ISAC), the orthogonal frequency division multiplexing (OFDM) waveform was proven to be optimal in mini…
Mobile Distributed MIMO (MD-MIMO) for NextG: Mobility Meets Cooperation in Distributed Arrays
Karim A. Said, Yibin Liang, Usama Saeed +13
Distributed multiple-input multiple-output (D\mbox{-}MIMO) is a promising technology to realize the promise of massive MIMO gains by fiber-connecting the distributed antenna arrays…
Reducing Inter-user Interference: Precoding over OFDM for Enhanced MTC
Karim A. Said, A. A. Louis Beex, Elizabeth Bentley +1
In the physical layer (PHY) of modern cellular systems, information is transmitted as a sequence of resource blocks (RBs) across various domains with each resource block limited to…
Towards xAI: Configuring RNN Weights using Domain Knowledge for MIMO Receive Processing
Shashank Jere, Lizhong Zheng, Karim Said +1
Deep learning is making a profound impact in the physical layer of wireless communications. Despite exhibiting outstanding empirical performance in tasks such as MIMO receive proce…
A Novel Interference Minimizing Waveform for Wireless Channels with Fractional Delay: Inter-block Interference Analysis
Karim A. Said, A. A., Beex +2
In the physical layer (PHY) of modern cellular systems, information is transmitted as a sequence of resource blocks (RBs) across various domains with each resource block limited to…
Wireless Mobile Distributed-MIMO for 6G
Kumar Sai Bondada, Daniel J. Jakubisin, Karim Said +2
The paper proposes a new architecture for Distributed MIMO (D-MIMO) in which the base station (BS) jointly transmits with wireless mobile nodes to serve users (UEs) within a cell f…
Neural Network-based Two-Dimensional Filtering for OTFS Symbol Detection
Jiarui Xu, Karim Said, Lizhong Zheng +1
Orthogonal time frequency space (OTFS) is a promising modulation scheme for wireless communication in high-mobility scenarios. Recently, a reservoir computing (RC) based approach h…
Maximally Concentrated Sequences after Half-sample Shifts
Karim A. Said, Lingjia Liu, A. A. +1
It is well known that index (discrete-time)-limited sampled sequences leak outside the support set when a band-limiting operation is applied. Similarly, a fractional shift causes a…
2D-RC: Two-Dimensional Neural Network Approach for OTFS Symbol Detection
Jiarui Xu, Karim Said, Lizhong Zheng +1
Orthogonal time frequency space (OTFS) is a promising modulation scheme for wireless communication in high-mobility scenarios. Recently, a reservoir computing (RC) based approach h…
Towards Explainable Machine Learning: The Effectiveness of Reservoir Computing in Wireless Receive Processing
Shashank Jere, Karim Said, Lizhong Zheng +1
Deep learning has seen a rapid adoption in a variety of wireless communications applications, including at the physical layer. While it has delivered impressive performance in task…