47 citations · 93 across the 19 of their papers we have counts for
20 papers
OAMP-Aided Joint Channel Estimation and Data Detection for ODDM Systems
Kehan Huang, Min Qiu, Akram Shafie +1
In this work, to address the challenge of joint channel estimation and data detection (JED) for orthogonal delay-Doppler (DD) division multiplexing (ODDM) in doubly selective chann…
A Novel One-tap Equalizer for Zero-Padded AFDM System over Doubly Selective Channels
Chenyang Zhang, Akram Shafie, Cheng Shen +2
Recently, affine frequency division multiplexing (AFDM) has gained traction as a robust solution for doubly selective channels. In this paper, we present a novel low-complexity one…
A Novel ISAC Waveform Based on Orthogonal Delay-Doppler Division Multiplexing with FMCW
Kehan Huang, Akram Shafie, Min Qiu +2
In this work, we propose the orthogonal delay-Doppler (DD) division multiplexing (ODDM) modulation with frequency modulated continuous wave (FMCW) (ODDM-FMCW) waveform to enable in…
Spectrum and Orthogonality of Orthogonal Delay-Doppler Division Multiplexing Modulation Waveforms
Akram Shafie, Jun Tong, Jinhong Yuan +4
Orthogonal delay-Doppler (DD) division multiplexing (ODDM) modulation has recently emerged as a promising paradigm for ensuring reliable communications in doubly-selective channels…
Delay-Doppler Domain Signal Processing Aided OFDM (DD-a-OFDM) for 6G and Beyond
Yiyan Ma, Bo Ai, Jinhong Yuan +10
High-mobility scenarios will be a critical part of 6G systems. Since the widely deployed orthogonal frequency division multiplexing (OFDM) waveform suffers from subcarrier orthogon…
On the Time-Frequency Localization Characteristics of the Delay-Doppler Plane Orthogonal Pulse
Akram Shafie, Jinhong Yuan, Nan Yang +1
In this work, we study the time-frequency (TF) localization characteristics of the prototype pulse of orthogonal delay-Doppler (DD) division multiplexing modulation, namely, the DD…
Channel Spreading Function-Inspired Channel Transfer Function Estimation for OFDM Systems with High-Mobility
Yiyan Ma, Bo Ai, Guoyu Ma +7
In this letter, we propose a novel channel transfer function (CTF) estimation approach for orthogonal frequency division multiplexing (OFDM) systems in high-mobility scenarios, tha…
Off-grid Channel Estimation for Orthogonal Delay-Doppler Division Multiplexing Using Grid Refinement and Adjustment
Yaru Shan, Akram Shafie, Jinhong Yuan +1
Orthogonal delay-Doppler (DD) division multiplexing (ODDM) has been recently proposed as a promising multicarrier modulation scheme to tackle Doppler spread in high-mobility enviro…
On the Coexistence of OTFS Modulation with OFDM-based Communication Systems
Akram Shafie, Jinhong Yuan, Paul Fitzpatrick +2
We investigate the coexistence of orthogonal time-frequency space (OTFS) modulation with current fourth- and fifth-generation (4G/5G) communication systems that primarily use ortho…
Orthogonal Delay-Doppler Division Multiplexing Modulation with Tomlinson-Harashima Precoding
Yiyan Ma, Akram Shafie, Jinhong Yuan +3
The orthogonal delay-Doppler (DD) division multiplexing(ODDM) modulation has been recently proposed as a promising modulation scheme for next-generation communication systems with…
Time-Frequency Localization Characteristics of the Delay-Doppler Plane Orthogonal Pulse
Akram Shafie, Jinhong Yuan, Nan Yang +1
The orthogonal delay-Doppler (DD) division multiplexing (ODDM) modulation has recently been proposed as a promising solution for ensuring reliable communications in high mobility s…
Coexistence of OTFS Modulation With OFDM-based Communication Systems
Akram Shafie, Jinhong Yuan, Yuting Fang +2
This study examines the coexistence of orthogonal time-frequency space (OTFS) modulation with current fourth- and fifth-generation (4G/5G) wireless communication systems that prima…
Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era
Nan Yang, Akram Shafie
Terahertz (THz) communications (THzCom) has experienced a meteoric rise of interest, due to its benefits for ultra-high data rate transmission in the sixth generation (6G) and beyo…
An Unsupervised Learning Approach for Spectrum Allocation in Terahertz Communication Systems
Akram Shafie, Chunhui Li, Nan Yang +2
We propose a new spectrum allocation strategy, aided by unsupervised learning, for multiuser terahertz communication systems. In this strategy, adaptive sub-band bandwidth is consi…
Terahertz Communications for 6G and Beyond Wireless Networks: Challenges, Key Advancements, and Opportunities
Akram Shafie, Nan Yang, Chong Han +3
The unprecedented increase in wireless data traffic, predicted to occur within the next decade, is motivating academia and industries to look beyond contemporary wireless standards…
Novel Spectrum Allocation Among Multiple Transmission Windows for Terahertz Communication Systems
Akram Shafie, Nan Yang, Chong Han +1
This paper presents a novel spectrum allocation strategy for multiuser terahertz (THz) band communication systems when the to-be-allocated spectrum is composed of multiple transmis…
Spectrum Allocation with Adaptive Sub-band Bandwidth for Terahertz Communication Systems
Akram Shafie, Nan Yang, Sheeraz Alvi +3
We study spectrum allocation for terahertz (THz) band communication (THzCom) systems, while considering the frequency and distance-dependent nature of THz channels. Different from…
Coverage Analysis for 3D Terahertz Communication Systems
Akram Shafie, Nan Yang, Salman Durrani +3
We conduct novel coverage probability analysis of downlink transmission in a three-dimensional (3D) terahertz (THz) communication (THzCom) system. In this system, we address the un…
Multi-Connectivity for Indoor Terahertz Communication with Self and Dynamic Blockage
Akram Shafie, Nan Yang, Chong Han
We derive new expressions for the connection probability and the average ergodic capacity to evaluate the performance achieved by multi-connectivity (MC) in an indoor ultra-wideban…
Coverage Analysis for 3D Terahertz Communication Systems with Blockage and Directional Antennas
Akram Shafie, Nan Yang, Zhuo Sun +1
The scarcity of spectrum resources in current wireless communication systems has sparked enormous research interest in the terahertz (THz) frequency band. This band is characterize…