NAMITHA A. S., Ph.D
Enthusiastic researcher with a Ph.D. in Wireless Communication, presently focused to applying AI/ML algorithms to address challenges in 6G physical layer with 9 years of experience spanning industry, academia, and research. Currently working in 6G research and development, with expertise in wireless communication systems and signal processing.
About
Possess 9 years of experience, including 3 years and 3 months in industry and 6 years in academia and research.
Experience
Technical Specialist
Nokia Mobile Networks R&D
- Developed a generalized EVM test framework using a common Simulink model, enabling EVM testing across 100/80/60/20 MHz bandwidths for the 6G RU. Previously, separate Simulink models were required for each bandwidth along with manual modifications to the source code within multiple Simulink blocks.
- Created a unified EVM testing framework for the receiver side, which was previously unavailable in the 6G RU for 100/80/60/20 MHz bandwidths.
- Provided TV support for the RX side for 20 MHz and mixed-bandwidth cases, resolved the delay issue, and successfully completed and passed the testing.
- Worked on the PBCH pronto multicell scenario, contributing to debugging and analysis.
- Designed a comprehensive HTML debug report for PBCH, integrating all critical plots required for efficient root-cause analysis.
- Enabled 256QAM in FR2 by activating all three MHABs (DMAP, LDEC, and FDEQ) and matched the CRC performance with that of the optimal performance (5GMAX FLP).
- Conducted a detailed investigation across thousands of MHAB parameters, using a systematic trial-and-error approach to identify critical parameters impacting performance, successfully resolving the issue and Resolved the saturation issue in Channel Estimation outputs after FxP conversion.
- Innovated and automated various features in PDSCH, PDCCH, and PBCH channels in 5G, including multi-cell and multi-slot scenarios to facilitate practical testing of 5G systems.
- Developed a comprehensive framework for performance analysis of multi-cell PBCH scenario.
- Submitted an invention for patent filing, which went through the standard IPR review process (Invention Submission ID: NC335556).
Assistant Professor
Vellore Institute of Technology
Taught various courses, conducted laboratory sessions, and performed extensive research concurrently.
Education
Ph.D. in Wireless Communication, Electronics and Communication Engineering
National Institute of Technology Calicut
Thesis Topic: Efficient techniques for PAPR reduction, sidelobe suppression and CFO estimation in OFDM based communication systems. Supervisor: Dr. Sameer S. M., Chair, IEEE Region-10 (Asia-Pacific), Professor, Department of Electronics and Communication engineering, NIT Calicut, Kerala (Email:sameer@nitc.ac.in ). Submitted thesis on 04-12-2017, open defence was held on 28.07.2018 and the PhD degree awarded in September,2018.
M.Tech in VLSI Design
Amrita School of Engineering
Skills
Simulation Tools
Hardware Description Language
Document Markup Language
Programming Language
Core Expertise
Wireless Technologies
Electronics & VLSI
Telecom
Data & ML
Projects
Simultaneous Minimisation of Side-band power and PAPR in OFDM based Cognitive Radio without any sending side information(SI)
In this work, an improved technique for the joint minimisation of sideband power and PAPR using Zadoff-Chu (ZC) sequence is proposed for cognitive radio based on OFDM technology. A detection algorithm based on a binary hypothesis testing problem is also proposed to recover the chosen ZC sequence at the receiver side, eliminating the requirement of SI-transmission.
PAPR reduction of OFDM systems using the H-SLM method with a multiplierless IFFT/FFT technique
A novel low complexity algorithm for the computation of IFFT / FFT operation in OFDM modulated BPSK communication systems without requiring any multiplication of twiddle factors. The PAPR reduction capacity of the H-SLM method is evaluated with the proposed IFFT algorithm without any complex multiplications
A new epidemic model SIPHERD for COVID-19 for the prediction of daily new positive and death cases in India and United States
A mathematical model for COVID-19 was developed using past data to enable accurate predictions. Three categories of infection carriers, symptomatic, purely asymptomatic, and exposed, are considered with different transmission rates that are taken depending on the social distancing conditions, and the detection rate of the infected carriers is taken dependent on the tests done per day. The model is applied to predict the total number of confirmed, active, and death cases and daily new positive cases in India and the United States. We analyze the impact of lockdown and the number of tests conducted per day on prediction and present scenarios in which infection can be controlled faster.
A Mathematical Model for Covid-19 Incorporating Vaccine Effectiveness in India and associated predictions and control measures
A mathematical model for Covid-19 incorporating vaccine effectiveness is also developed and bring out associated predictions for various vaccination rates and pointed out optimum control measures.
Certifications
RAN AI/ML and Data Engineering
LinkedIn Learning
Acquired certification
Awards
First place (Solo Author) in the Nokia White Paper Contest 2023
Nokia Innovation Board
Jan 2023
For the work titled 'A novel PAPR reduction technique for PAPR reduction in OFDM systems'.
Third Best thesis award
IEEE ComSoc society, Kerala and Bangalore chapter
Jan 2018
Kalathilakam
School-level Youth Festival
Received the title of 'Kalathilakam' in the school-level Youth Festival.
Interests
Patent Granted
A BANDWIDTH EFFICIENT METHOD FOR SIMULTANEOUS MINIMISATION OF SIDE-BAND POWER AND PAPR IN OFDM BASED COGNITIVE RADIO SYSTEMS (Solo Author)
Patent Grant number: 2022/01777
Research Publications - International Journals
Control Strategies for the COVID- 19 Infection Wave in India: A Mathematical Model Incorporating Vaccine Effectiveness
IEEE Transactions On Computational Social Systems, March,2023 (Impact factor=4.9)
Simultaneous minimization of side-band power and PAPR in OFDM based cognitive radio without additional bandwidth requirement for sending SI.
Transactions on Emerging Telecommunications Technologies, Wiley, April 2022. (Impact factor=4.19)
A PAPR reduction of OFDM systems using H-SLM method with a multiplierless IFFT/FFT technique
ETRI Journal, Wiley, August,2021,IF=2.62
An Epidemic Model SIPHERD and its application for prediction of the spread of COVID-19 infection in India
Chaos, Solitons Fractals, Elsevier, July,2020, (Impact factor=9.92)
Estimation of Undetected Symptomatic and Asymptomatic cases of COVID-19 Infection and prediction of its spread in USA
International Journal of Medical Virology, Wiley, Feb, 2021 (Impact factor=20.69)
Correction in Active Cases Data of COVID-19 for the US States by Analytical study
Disaster Medicine and Public Health Preparedness, Cambridge University Press, April,2021 (Impact factor=5.556)
An Improved Selective Mapping Technique to Reduce Peak to Average Power Ratio in SISO and SIMO OFDM Systems Without Side Information
Circuits, Systems, and Signal Processing, Springer, vol.36, no.10, pp. 4181–4206, Oct. 2017, (Impact factor=2.3)
A Bandwidth Efficient Selective Mapping Technique for the PAPR Reduction in Spatial Multiplexing MIMO-OFDM Wireless Communication Systems
Physical Communication, Elsevier, vol.25, no.10, pp. 128–138, Dec. 2017. (Impact factor= 2.37)
A Combined Technique for Carrier Frequency Offset Estimation and Peak-to-Average Power Ratio Reduction in OFDM Systems Using Null subcarriers and Cuckoo Search Algorithm
Telecommunication system, Springer, vol. 63, no. 2, pp. 275–285, Oct. 2016, (Impact factor=2.5)
A Novel Joint Method for Frequency Offset Estimation and Peak-to-Average Power Ratio Reduction in OFDM Systems using Null Subcarriers
Wireless Personal Communications (WPC), Springer, vol. 83, no. 1, pp. 343–359, Jul. 2015. (Impact factor=2.2)
A Joint Technique for Sidelobe Suppression and Peak to Average Power Ratio Reduction in Noncontiguous OFDM Based Cognitive Radio Networks
International J. of Electronics, Taylor and Francis, vol. 104, no. 2, pp. 190–203, July. 2016, (Impact factor=1.4)
Research Publications - Key International Conferences
An improved technique to reduce peak to average power ratio in OFDM systems using gold/Hadamard codes with selective mapping
In proc. of IEEE International Conference on Signal Processing and Communications (SPCOM), IISc Bangalore, Jul. 2014, pp. 1-6, DOI: 10.1109/SPCOM.2014.6983972.
https://doi.org/10.1109/SPCOM.2014.6983972Joint PAPR and sidelobe reduction in non-contiguous OFDM based cognitive radio systems
In proc. of IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), NIT Calicut, Feb. 2015, pp. 1-5, DOI: 10.1109/SPICES.2015.7091449.
https://doi.org/10.1109/SPICES.2015.7091449Technical Talks Delivered
PAPR Reduction for OFDM in 6G Networks
Delivered a presentation to the Nokia Standardization (NSD) team.
A Novel PAPR Reduction Method for OFDM Signal using Selective Sub-blocks
Delivered a talk in 'InnoTech show' at Nokia, Bangalore.
EVM-PAPR performance analysis for FR1 in Downlink/Uplink 6G-RU
Presented in the team, Nokia, Bangalore.
Technical writing 'An Interactive Introduction to LATEX'
Presented in the team, Nokia, Bangalore.
Introduction to 5G Communication and Error Detection Codes used in 5G
Delivered a talk in VIT, Vellore.
Workshop on 'RF SYSTEM DESIGN & 5G COMMUNICATION'
Delivered a talk at a workshop conducted by Dept. of Electronics and Communication Engg., Muthoot Institute of Technology and Science, Puthencruz.
Workshops/Courses Attended
Faculty Development Program on “Next Generation Communication System Design Using NI USRP"
Conducted by Dept. of Electronics and Communication Engg., VIT Vellore, TN.
Faculty Development Program on “EMERGING AND RELEVANT AREAS IN RF AND WIRELESS COMMUNICATION ENGINEERING"
Conducted by Dept. of Electronics and Communication Engg., Muthoot Institute of Technology and Science, Puthencruiz.
Faculty Development Program on “ESTIMATION AND CODING FOR MULTIMEDIA PROCESSING"
Conducted by Dept. of Electronics and Communication Engg., National Institute of Technology Calicut.
Faculty Development Program on “Excellence in technical Education- Role of faculty empowerment"
Conducted by ISTE chapter, METS school of engineering, Mala.
Faculty Development Program on “FPGA Based RTL and System Design”
Conducted by Dept. of Electronics and Communication Engg., Amrita Vishwa Vidyapeetham, Coimbatore.
Workshop on “VLSI Front-end Design Tools"
Conducted by Dept. of Electronics and Communication Engg., Amrita Vishwa Vidyapeetham, Coimbatore.
Strengths
Sincere and honest, hard-working, disciplined, optimistic, dedicated, respectful of others, emotionally open and confident.