14 papers
Making AFDM Secure Against Eavesdroppers: A Phase Function Design Approach
Hengxuan Liu, Vincent Savaux, Arman Farhang
Affine frequency division multiplexing (AFDM) has recently emerged as a promising waveform for high-mobility communications due to its resilience to Doppler effects and its advanta…
Joint Phase Noise and Channel Estimation for OTFS
Stephen McWade, Arman Farhang
This paper investigates the effect of oscillator phase noise in orthogonal time frequency space (OTFS) systems. The paper provides in-depth analysis of the interference due to phas…
Multiuser OTFS Channel Parameter Estimation Toward Grid-Independent Regime
Hanning Wang, Rong-Rong Chen, Arman Farhang
We study channel parameter estimation for multiuser orthogonal time frequency space (OTFS) systems in the delay-Doppler (DD) domain. To enable structured parametric estimation, we…
HAPS-RIS and UAV Integrated Networks: A Unified Joint Multi-objective Framework
Arman Azizi, Mostafa Rahmani Ghourtani, Mustafa A. Kishk +2
Future 6G non-terrestrial networks aim to deliver ubiquitous connectivity to remote and undeserved regions, but unmanned aerial vehicle (UAV) base stations face fundamental challen…
Channel Estimation using 5G Sounding Reference Signals: A Delay-Doppler Domain Approach
Danilo Lelin Li, Ramtin Rabiee, Arman Farhang
Delay-Doppler multicarrier modulation (DDMC) techniques have been among the central topics of research for high-Doppler channels. However, a complete transition to DDMC-based wavef…
Towards Standardizing OTFS: A Candidate Waveform for Next-Generation Wireless Networks
Mingcheng Nie, Ruoxi Chong, Shuangyang Li +5
The standardization of the sixth-generation (6G) has recently commenced to address the rapidly growing demands for enhanced wireless network services. Nevertheless, existing wirele…