10 citations · 11 across the 14 of their papers we have counts for
16 papers
Modulation Augmentation and Constellation Shaping for LDPC-Coded QPSK
Heping Wan, Joonyoung Cho, Sandesh Rao Mattu +4
While constellation shaping improves spectral efficiency, its application to quadrature phase-shift keying (QPSK) remains limited. We address this limitation by incorporating a sho…
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…
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…
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…
Increasing Data Rate through Shaping on Wireless Channels Subject to Mobility and Delay Spread
Sandesh Rao Mattu, Nishant Mehrotra, Robert Calderbank
This letter describes how to improve performance of cellular systems by combining non-equiprobable signaling (shaping) with low-density parity check (LDPC) coding for an orthogonal…
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…
Pulse Shaping Filter Design for Integrated Sensing & Communication with Zak-OTFS
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
Zak-OTFS provides a framework for integrated sensing & communication (ISAC) in high delay and Doppler spread environments. Pulse shaping filter design enables joint optimization of…
Discrete Radar based on Modulo Arithmetic
Nishant Mehrotra, Sandesh Rao Mattu, Saif Khan Mohammed +2
Zak-OTFS is modulation scheme where signals are formed in the delay-Doppler (DD) domain, converted to the time domain (DD) for transmission and reception, then returned to the DD d…
Low-Complexity Equalization of Zak-OTFS in the Frequency Domain
Sandesh Rao Mattu, Nishant Mehrotra, Saif Khan Mohammed +2
4G/5G wireless standards use orthogonal frequency division multiplexing (OFDM) which is robust to frequency selectivity. Equalization is possible with a single tap filter, and low-…
Improving the Spectral Efficiency of Zak-OTFS via Mutually Unbiased Bases
Sandesh Rao Mattu, Nishant Mehrotra, Robert Calderbank
Orthogonal signaling or Nyquist signaling limits the number of information symbols transmitted in bandwidth and time to be , the time-bandwidth product. Transmitting mo…
Instantaneous Polarimetry with Zak-OTFS
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
Polarimetry, which is the ability to measure the scattering response of the environment across orthogonal polarizations, is fundamental to enhancing wireless communication and rada…
Differential Communication in Channels with Mobility and Delay Spread using Zak-OTFS
Sandesh Rao Mattu, Nishant Mehrotra, Robert Calderbank
Zak-transform based orthogonal time frequency space (Zak-OTFS) is a delay-Doppler (DD) domain modulation scheme in which the signal processing is carried out in the DD domain. The…
Low-Complexity Frequency Domain Equalization of Zak-OTFS in Doubly-Spread Channels
Saif Khan Mohammed, Sandesh Rao Mattu, Nishant Mehrotra +2
We communicate over wireless channels by first estimating and then equalizing the effective channel. In Zak-OTFS (orthogonal time frequency space) modulation the carrier waveform i…
Zak-OTFS with Spread Carrier Waveforms
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
Zak-OTFS (orthogonal time frequency space) modulation is a communication framework that parameterizes the wireless channel in the delay-Doppler (DD) domain, where the parameters ma…
Zak-OTFS for Mutually Unbiased Sensing and Communication
Nishant Mehrotra, Sandesh Rao Mattu, Robert Calderbank
Waveforms with ideal ambiguity functions are fundamental to integrated sensing and communication, to active sensing (radar), and to uplink multiple access. We describe a general me…
Consensus ADMM-Based Distributed Simultaneous Imaging & Communication
Nishant Mehrotra, Ashutosh Sabharwal, César A. Uribe
This paper takes the first steps toward enabling wireless networks to perform both imaging and communication in a distributed manner. We propose Distributed Simultaneous Imaging an…