Zak-OFTS- The Wavefore for Next Gen Comm 6G- UTD ECE Dept Spkr-Dr. Saif Mohammed

On June 5th (10-11am), Prof. Saif Khan Mohammed from IIT Delhi will be presenting at UT Dallas, Erik Jonsson Engineering and Computer Science North bldg. on the topic of:

Zak- OFTS – The Waveform for Next Generation Communication (6G) Systems

Saif Khan Mohammed | Professor
Indian Institute of Technology Delhi, India

will present on

June 5, 2025 | 10am – 11am
Room: ECSN 2.120
(Click on the following link to find map to the ECSN 2.120 meeting room in Erik Jonsson School of Engineering and Computer Science North bldg: [https://maps.app.goo.gl/EgKebuwKSTciXApq7 ](https://maps.app.goo.gl/EgKebuwKSTciXApq7)

For Directions about

• where to park,
• how to pay or enter coupon code for parking,
• who to contact for coupon code,
• how to find meeting room
• go to bottom of this page.

ABSTRACT
Traditional carrier waveforms are not suited for new 6G usage scenarios like ubiquitous connectivity, AI and communication, and Integrated Communication and Sensing.

This is primarily because most carrier waveforms are either localized in time (time-domain pulses in 2G/3G) or in frequency (sinusoids as in 4G/5G). New 6G scenarios demand high throughput reliable communication and accurate sensing in doubly-spread channels which induce delay and Doppler shifts to the carrier waveforms.

The channel interaction of carriers which are localized in either time or frequency is both time-selective and frequency-selective which severely degrades performance when delay and Doppler spread are high.

Therefore, the carrier waveform ideally suited for doublyspread channels is one which is simultaneously localized in both time and frequency. Such waveforms do not exist due to the Heisenberg’s uncertainty principle.

In our pioneering work, we however avoid this obstruction by designing a carrier waveform called a pulsone whose time and frequency realizations are both periodic pulse train modulated by a sinusoid.

A pulsone is therefore localized within a finite interval in both time and frequency, i.e., quasi-localized as the interval is finite. In this talk we present our work based on signal representation in the delay-Doppler (DD) domain which gives rise to pulsones.

The DD domain representation of any timedomain/frequency-domain signal is given by its Zak transform. Pulsones are simply quasiperiodic pulses in the DD domain whose interaction with a doubly-spread channel is stationary and non-fading when the pulse period along the delay axis is greater than the channel delay spread and the pulse period along the Doppler axis is greater than the channel Doppler spread, a condition we refer to as the crystallization condition.

In Zak-OTFS modulation, information is carried by pulses in the DD domain. Due to the stationary inputoutput (I/O) relation of Zak-OTFS modulation, the effective DD domain channel can be acquired/estimated with negligible overhead, and the performance is robust to channel delay and Doppler spread.

SHORT BIOGRAPHY
Saif Khan Mohammed is a Professor with the Department of Electrical Engineering, Indian Institute of Technology Delhi (IIT Delhi). He currently holds the Jai Gupta Chair at IIT Delhi. He received the B.Tech. degree in Computer Science and Engineering from IIT Delhi, New Delhi, India, in 1998, and the Ph.D. degree from the Electrical Communication Engineering Department, Indian Institute of Science, Bangalore, India, in 2010.

From 2010 to 2011, he was a Post-Doctoral Researcher at the Communication Systems Division (Commsys), Electrical Engineering Department (ISY), Linkoping University, Sweden.

He was an Assistant Professor at Commsys, from September 2011 to February 2013. His main research interests include waveforms for sixth generation (6G) communication systems, wireless communication using large antenna arrays, coding and signal processing for wireless communication systems, information theory, and statistical signal processing.

FOR MORE INFORMATION, CONTACT:

Naofal Al-Dhahir (event host)
aldhahir@utdallas.edu
ECE Dept. Associate Head
University of Texas at Dallas
Fellow of the National Academy of Inventors
IEEE Fellow
https://www.utdallas.edu/~aldhahir

More About ECE
www.ece.utdallas.edu
ERIK JONSSON SCHOOL
of Engineering and Computer Science

Overview directions

• for parking,
• paying/enter coupon code,
• who to contact for parking coupon code (Ann.Ghiran@utdallas.edu)
• finding the meeting room ECSN 2.120:

From Campbell Dr. and Waterview Pkwy drive north to Franklyn Jennifer Dr. then turn east on Franklyn Jennifer Dr. and go approx. 500 ft. to Drive H.
Park in Parking Structure #4 on NE corner of F. Jennifer Dr. and Drive H (either pay for parking at the parking meter, or use coupon code from Ann Ghiran at: Ann.Ghiran@utdallas.edu ).

After paying, or entering coupon code, exit PS#4 at SE corner and walk east approx. 300 ft. on F. Jennifer to Rutford Dr. Then walk north on Rutford approx. 500 ft. to the Erik Jonsson Engineering and Computer Science North bldg. Enter at SW corner of the bldg. ECSN 2.120 is along the north side of the "North" bldg.

**To receive the coupon code for parking contact Ann Ghiran at: Ann.Ghiran@utdallas.edu**

How to use Pay-By-Space Coupons at parking meter:
1. Press any button on the keypad to start.
2. Enter your parking space number, or “staff number,” then push the green “OK” button.
3. Press “1” to Purchase Ticket.
4. Or Press “2” to Pay by Coupon.
5. Enter the number of hours for which you would like to park and press the green “OK” button.
Enter your coupon code number (xxxxxxxx) and press the green "OK” button (contact Ann Ghiran at Ann.Ghiran@utdallas.edu for code).
6. Collect and keep your receipt. The time your parking expires is printed on your receipt.