26 papers
Delay-Doppler Channel Estimation using Arbitrarily Modulated Data Transmissions
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
Conventional delay-Doppler (DD) communication and sensing systems require transmitting pilot frames at every channel coherence time interval in order to keep track of channel varia…
Improving Doppler Resilience of OFDM through Delay-Doppler Sensing
Danish Nisar, Saif Khan Mohammed, Muhammad Ubadah +2
The performance of traditional CP-OFDM degrades severely in doubly-spread wireless channels due to inter-carrier interference (ICI). In this paper, we propose DD domain sensing bas…
Zak-OTFS: A Predictable Physical Layer for Communications and Sensing
Sandesh Rao Mattu, Nishant Mehrotra, Venkatesh Khammammetti +1
This tutorial derives the mathematical foundations of what it means for a carrier waveform to be predictable and non-selective. We focus on Zak-OTFS, where each carrier waveform is…
Real-Time and Scalable Zak-OTFS Receiver Processing on GPUs
Junyao Zheng, Chung-Hsuan Tung, Yuncheng Yao +6
Orthogonal time frequency space (OTFS) modulation offers superior robustness to high-mobility channels compared to conventional orthogonal frequency-division multiplexing (OFDM) wa…
A Universal Neural Receiver that Learns at the Speed of Wireless
Lingjia Liu, Lizhong Zheng, Yang Yi +1
Today we design wireless networks using mathematical models that govern communication in different propagation environments. We rely on measurement campaigns to deliver parametrize…
A Design Framework that Unifies 6G Modulation Schemes for Double Selectivity
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
There is significant recent interest in designing new modulation schemes for doubly-selective channels with large delay and Doppler spreads, where legacy modulation schemes based o…