Prem Singh

Areas

Welcome to my webpage! Research positions are available for prospective PhD, Master, and Undergraduate students to work in the following state-of-the-art areas of 5G and next-generation wireless systems. If interested, please drop me an email with your resume. Please visit the Publications and Research & Consulting tabs for more details. My current interests lie in the area of Embedded Systems and Transceiver Design for 5G and Beyond Mobile Communication. In particular, I focus on

• Hardware and firmware Design, testing and integration for 3GPP-compliant 5G Mobile Communication
• Prototype development for Beyond 5G Technologies such as Intelligent reflecting Surfaces (IRS), Orthogonal Time-frequency and Space (OTFS) and Integrated Sensing and Communication (ISAC) for translational research.
• End-to-end low-cost testbed setup for Beyond 5G Technologies such as Open Radio Access Network (ORAN) and 3GPP based 5G network, Millimeter Wave, Cellular IoT, and IRS.
• Private 5G: Setting up 3GPP compliant Private 5G Network and developing applications on top of it.  
• Transceiver Design for 5G and Beyond Wireless Systems: Parameter estimation, Low-complexity receiver design, and sparse signal recovery for 5G and beyond wireless technologies including Orthogonal Time-Frequency space (OTFS), Cell-free Massive MIMO, Millimeter Wave, Intelligent reflecting Surfaces (IRS) and Integrated Sensing and Communication (ISAC)
• Machine Learning for Communication: Multi-user modulation classification using unsupervised and Deep learning.

Ongoing Projects

News

• [March 2024] Our paper on "Energy Efficient Massive MIMO IoT Network" was accepted by IEEE SPCOM'24, IISc Bangalore India.
• [March 2024] MS student received the student travel grant to present a paper in IEEE WCNC'24 in  Dubai, UAE. Congratulation Suhail!
• [Feb 2024] Invited talk on "Integrated Sensing and Communication for V2X Systems" at IIT Roorkee in association with the IEEE Roorkee Sub-Section and  IEEE COMSOC UP Section.
• [Jan 2024] Our paper on Physical Layer Security for OTFS-aided RIS Communication was accepted at the IEEE WCNC, Dubai, UAE.
• [Jan 2024] Invited to serve as a Technical Program Committee (TPC) member for IEEE ICC 2024.
• [Jan 2024] Invited talk on “Receiver Design for High Mobility Beyond 5G Wireless Communication” in an FDP program at IIT BHU.
• [Dec 2023] Our paper on “OTFS Aided Full-Duplex Cell-Free Massive MIMO” got accepted in IEEE WCNC to be held in Dubai, UAE.
• [Dec 2023] Invited talk on “Unlock 5G Excellence with NI SDR and Mantiswave Networks Solutions” at VVDN-NI Academic Conclave on 5G and 6G Research Mumbai.
• [Dec 2023] Invited talk on “Receiver Design for High Mobility Beyond 5G Wireless Communication” at REC, Kannauj under the AICTE-ATAL FDP scheme.
• [Nov 2023] Signed an MoU with SDI Indian Airforce for collaborative work on waveform design for airborne systems.
• [Nov 2023] Invited Keynote talk on “Embedded System Design for 5G and Beyond Mobile Communication” at CorEl Education Submit 2023.
• [Oct 2023] Co-founded “Mantiswave Networks Pvt. Ltd.”, a start providing affordable pug-and-play private 5G network solutions.
• [Oct 2023] Our paper on Variational Bayesian Learning Based Channel Estimator For Multi-User OTFS Systems was accepted in IEEE Communication Letters.
• [Sept 2023] Invited talk on "Multi-Port Delay-Doppler Reference Signal Design for MU-OTFS Using Code Domain Orthogonality" in IEEE ELEXCOM'23, IIT Roorkee.
• [August 2023] Two papers got accepted in IEEE GLOBECOM'23 to be held in Kuala Lumpur, Malaysia.
• [August 2023] Invited talk on "Low-Complexity MIMO Receivers for High Mobility Applications" at the University of Luxembourg, Luxembourg.
• [August 2023] Invited to serve as a Social Media Co-Chair for IEEE AI-ML Syetms'23 and IEEE COMESNETS 2024
• [July 2023] Three papers got accepted in IEEE TENCON'23 to be held in Chiang Mai, Thailand.
• [July 2023] Invited to serve as a Technical Program Committee (TPC) member for IEEE COMESNETS 2024.
• [July 2023] Invited talk on "Low-Complexity MIMO Receivers for High Mobility Applications" in Karyashala (High-end workshop) organised by NIT Trichy [Details].
• [June 2023] Invited to serve as Invited Talk Chair for ELEXCO'23 organised by IIT Roorkee [Details].
• [June 2023] Invited talk in LRDE DRDO  Bengaluru on "Integrated Sensing and Communication (ISAC) for High Mobility Defense Applications".
• [May 2023] The project ‘A novel power-on pilot IC for ultra-low power wireless IoT device’ got approved by the Ministry of Electronics and Information Technology, Govt of India.
• [May 2023] Organised a micro workshop on ‘Enhancing Security, Efficiency and Performance in Beyond 5G Networks’ in collaboration with DoT and TSDSI [details].
• [April 2023] Successfully completed the course on “ML Applications for Wireless Applications” offered to Samsung R&D Bangalore.
• [Feb 2023] Co-chaired a session on Ubiquitous Intelligent Mobile Connected Society at TSDSI Workshop on Standards Driven Research - NCC 2023 [details].
• [Jan 2023] Offering a course on “ML Applications for Wireless Applications” to Samsung R&D Bangalore.
• [Jan 2023] Invited to serve as a Technical Program Committee (TPC) member for ICC 2023, a flagship conference of IEEE Communication Society.
• [Jan 2023] Completed my first project titled "3GPP Compliant PUCHH design for 5G-NR User" funded by SpanIdea Systems Pvt. Ltd.
• [Jan 2023] Received funding from SERB, Govt of India, for the project "Multi-Carrier Waveforms for Intelligent Reflecting Surface (IRS) assisted systems".
• [Jan 2023] Delivered a tutorial on "OTFS aided cell-free massive MIMO for beyond 5G" in COMSNETS 2023 [Link].
• [Nov 2022] Invited to serve as a Technical Program Committee (TPC) member for IEEE COMESNETS 2023.

• [Oct 2022] Our paper on “Low-Complexity LMMSE Receiver Design For Practical-Pulse-Shaped MIMO-OTFS Systems” got accepted in IEEE Transactions on Communication.
• [Sept 2022] Our abstract “Low-Complexity Detection for MIMO-OTFS Systems” got accepted for presentation at the Indian Mobile Congress, 2022, New Delhi.
• [Sept 2022] Conducted three FDP sessions on Wireless Communication for the faculty members of Myanmar Institute of Information Technology, Myanmar. 
• [Sept 2022] A project titled “Real-time implementation of multi-user MIMO/massive MIMO-OTFS systems for beyond 5G"  got accepted. Funding agency: SERB, Govt. of India.
• [Sept 2022] The Project titled “Development of New Prototype for RIS-aided Communication for Beyond 5G” got approved. Funding agency: DST under NM-ICPS.
• [August 2022]  Our paper on low-complexity linear receiver design for massive MIMO-OTFS got accepted in IEEE Communications Letters.
• [August 2022]  Abhishek Mishra and Mourya Choubey, students of NIT Raipur, have completed their internship on "Physical Downlink Shared Channel (PDSCH) for 5G-NR."
• [July 2022]  Our paper got shortlisted for the best student paper award at the IEEE International Conference on Signal Processing and Communications (SPCOM), Bangalore.
• [July 2022]  Our paper on Semi-Blind Technique for Frequency Selective Channel Estimation in Millimeter-Wave MIMO Coded FBMC System got accepted in IEEE SPCOM organised by IISc Bangalore.
• [June 2022]  Two research papers from my group were selected by the IEEE Communication Society for the best readings for channel estimation and multiple antenna and multiple access for OTFS and delay-Doppler signal processing [see my publications for details].
• [May 2022]  Our paper on SBL-aided Estimation of Doubly-Selective MIMO Channels for FBMC Systems got accepted in IEEE Transactions on Communication.
• [April 2022]  Got a project "3GPP Compliant PUCCH design for 5G-NR USer". Funding Agency: SpanIdea Systems Pvt. Ltd.
• [March 2022] Organised a workshop, "5G-NR Physical Layer: Modeling, Technologies and Standards" with the IIITB COMET foundation. The Workshop received 400+ registrations.
• [Feb 2022] Our paper on BER analysis of ZF OTFS systems got accepted for publication in IEEE Transactions on Communication.
• [Jan 2022] Our paper on low-complexity receiver design for OTFS systems got accepted for publication in IEEE Open Journal on Communications.
• [Dec 2021] Our paper on Low-Complexity LMMSE Receiver for Practical Pulse-Shaped MIMO-OTFS Systems got accepted in IEEE WCNC 2022.
• [Nov 2021] Two book chapters got accepted for publication in the book "A Glimpse Beyond 5G in Wireless Networks" by the publisher Springer Nature.
• [October 2021] My PhD thesis got shortlisted for the final round of the INAE Innovative Student Project Award 2021
• [August 2021] Our paper on receiver design for OTFS systems using superimposed pilots got accepted in IEEE Transactions on Wireless Communications
• [July 2021] Our paper on uplink transmission in multi-cell massive MIMO-FBMC systems over Ricean fading got accepted in IEEE VTC-fall 2021
• [July 2021] Our paper on Closed-form BER for ZF OTFS receiver got accepted for publication in IEEE SPAWC 2021, Lucca Italy.
• [July 2021] Joined the International Institute of Information Technology Bangalore (IIITB), India as an Assistant Professor.
• [March 2021] Two papers on OTFS receiver design got accepted in IEEE ICC 2021 Workshop on OTFS for 6G and Future High-mobility Communications, Montreal, Canada
• [Jan 2021] Got selected as an assistant professor at IIIT Bangalore
• [Dec 2020] Got the Best PhD Thesis Award in the 4th IEEE Conference on Information Communication Technology organized by IIIT Kanchipuram
• [Oct. 2020] Our paper on Bayesian learning-based channel estimation for mmWave Hybrid MIMO-FBMC Systems got accepted in IEEE Transactions on Communications

• Nishant, Anupama Rajoria, Prem Singh, and R. Budhiraja, "Variational Bayesian Learning Based Delay-Doppler Channel Estimator For Multi-User OTFS Systems", IEEE Communications Letters, 2023 [Link].
• Prem Singh, Shashank Tiwari and R. Budhiraja, "Low-Complexity LMMSE Receiver Design For Practical-Pulse-Shaped MIMO-OTFS Systems," IEEE Transactions Communications, 2022 [Link].
• Mudasir Ahamad, Prem Singh, R. Budhiraja, "Low-Complexity MMSE Receiver Design For Massive MIMO OTFS Systems," IEEE Communications Letters, 2022 [Link].
• Prem Singh, Suraj Srivastava, Amrita Mishra, Aditya K. Jagannatham and L Hanzo, "Sparse Bayesian Learning Aided Estimation of Doubly-Selective MIMO Channels for Filter Bank Multicarrier Systems" IEEE Transactions on Communications, 2022 [Link].
• Prem Singh, Khushboo Yadav, Himanshu B. Mishra and Rohit Budhiraja, "BER Analysis For OTFS Zero Forcing Receiver" IEEE Transactions on Communications, 2022 [Link].
• Prem Singh, Abhishek Gupta, Himanshu B. Mishra and Rohit Budhiraja, "Low-Complexity ZF/MMSE MIMO-OTFS Receivers For High-Speed Vehicular Communication" IEEE Open Journal of the Communications Society, 2022 [Link] (picked by the IEEE Communication Society for the best reading in OTFS and delay-Doppler signal processing under the multiple antenna and multiple access category)
• Himanshu B. Mishra, Prem Singh, Abhishek K. Prasad and Rohit Budhiraja, "OTFS Channel Estimation And Data Detection Designs With Superimposed Pilots" IEEE Transactions on Wireless Communications, 2021 [Link] (picked by the IEEE Communication Society for the best reading in OTFS and delay-Doppler signal processing under the channel estimation category.)
• Suraj Srivastava, Prem Singh, Aditya K Jagannatham, Abhay Karandikar and Lajos Hanzo, "Bayesian Learning-Based Doubly-Selective Sparse Channel Estimation for Millimeter Wave Hybrid MIMO-FBMC-OQAM” IEEE Transactions on Communications, vol. 69, no. 1, pp. 529--543, 2021 [Link].
• Prem Singh, Suraj Srivastava, Aditya K Jagannatham and Lajos Hanzo, "Second-Order Statistics-Based Semi-Blind Techniques for Channel Estimation in Millimeter-Wave MIMO Analog and Hybrid Beamforming.” IEEE Transactions on Communications, vol. 68, no. 11, pp. 6886--6901, 2020 [Link].
• Prem Singh, H. B. Mishra, A. K. Jagannatham, K. Vasudevan, and L. Hanzo. "Uplink sum-rate and power scaling laws for multi-user massive MIMO-FBMC systems," IEEE Transactions on Communications, vol. 68, no. 1, pp. 161--176, 2020 [Link].
• Prem Singh, H. B. Mishra, A. K. Jagannatham, and K. Vasudevan, "Semi-blind, training, and data-aided channel estimation schemes for MIMO-FBMC-OQAM Systems," IEEE Transactions on Signal Processing, vol. 67, no. 18, pp. 4668--4682, 2019 [Link].
• Prem Singh, R. Budhiraja, and K. Vasudevan, "Probability of error in MMSE detection for MIMO-FBMC-OQAM Systems," IEEE Transactions on Vehicular Technology, vol. 68, no. 8, pp. 8196--8200, 2019 [Link].
• Prem Singh, R. Budhiraja, and K. Vasudevan, "SER analysis of MMSE combining for MIMO FBMC-OQAM systems with imperfect CSI," IEEE Communications Letters, vol. 23, no. 2, pp. 226--229, 2019 [Link].
• Prem Singh, R. Budhiraja, and K. Vasudevan. "Receivers for VBLAST FBMC-OQAM Systems," IEEE Communications Letters, vol. 24, no. 4, pp. 767--771, 2020 [Link].
• Prem Singh, E. Sharma, R. Budhiraja, and K. Vasudevan, "CFO and channel estimation for frequency selective MIMO-FBMC/OQAM systems." IEEE Wireless Communications Letters, vol. 7, no. 5, pp. 844--847, 2018 [Link].
• Prem Singh and K. Vasudevan, "Training-based frequency synchronization and highly frequency selective channel estimation for OFDM/OQAM systems," IET Communications, vol. 13, no. 18, pp. 2895--2903, 2019 [Link].
• Prem Singh, and K. Vasudevan, "Time domain channel estimation for MIMO-FBMC/OQAM systems," Springer Wireless Personal Communications, vol. 108, no. 4, pp. 2159--2178, 2019 [Link].
• Shivani Singh, Prem Singh and K. Vasudevan, "Uplink Sum Rate Analysis of Multi-User Massive MIMO-OFDM/OQAM Systems in Ricean Fading," IET Communications, vol. 14, no. 11, pp. 1773--1782, 2020 [Link].

• Kunwar Rajput, Ekant Sharma, Prem Singh and Bhawani Shankar, "Energy Efficient Massive MIMO IoT Network: A Power and MSE Constrained Approach", IEEE SPCOM, 2024, IISc Bangalore, India [to appear].
• Suahail Farhaan, Soujanya Samudrala, Prem Singh and Ekant Sharma, “Two-Fold Physical Layer Security for OTFS-aided RIS Communication” in IEEE Wireless Communications and Networking Conference (WCNC), Dubai, UAE, 2024 [to appear].
• Dwikul Jyoti Das, Sai Teja Kollimarla, Ekant Sharma and Prem Singh, “OTFS Aided Full-Duplex Cell-Free Massive MIMO” in IEEE Wireless Communications and Networking Conference (WCNC), Dubai, UAE, 2024 [to appear].
• Gaurav Jajoo and Prem Singh, "Modulation Recognition: An Unsupervised Learning Approach", IEEE Global Conference on Communications (GLOBECOM), Kuala Lumpur, Malaysia, 2023 [Link].
• Mudasir Ahmad Sheikh, Anupama Rajoriya, Prem Singh and Rohit Budhiraja, "Coupled Prior-Based Sparse Bayesian Channel Estimation for Superimposed Pilot OTFS Systems", IEEE Global Conference on Communications (GLOBECOM), Kuala Lumpur, Malaysia, 2023 [Link].
• Rochak Jain, Naveed Anjum, Saujanya Samudrala, Harsha Rudramuniyappa, Ashutosh Bisht, Ekant Sharma and Prem Singh, "FPGA Implementation of Rate Matching in 5G NR PDSCH", IEEE TENCON, Chiang Mai, Thailand, 2023 [Link].
• Harsha Rudramuniyappa, Soujanya Samudrala, Rochak Jain, Naveed Anjum, Prem Singh and Ekant Sharma, "FPGA Implementation and Architecture Design of Polar Encoder for 5G NR", IEEE TENCON, Chiang Mai, Thailand, 2023 [Link].
• Soujanya Samudrala, Himanshu B. Mishra and Prem Singh, "IRS Assisted FBMC Waveform: Channel Estimation and Reflecting Coefficients Optimization", IEEE TENCON, Chiang Mai, Thailand, 2023 [Link].
• Murali Pavuluri, Prem Singh, Vikram M. Gadre and Aditya K. Jagannatham, "Semi-Blind Technique for Frequency Selective Channel Estimation in Millimeter-Wave MIMO Coded FBMC System", IEEE SPCOM, IISc Bangalore, 2022 [Link] (finalist for the best student paper award).
• Shashank Tiwari, Prem Singh, and Rohit Budhiraja, "Low-Complexity LMMSE Receiver for Practical Pulse-Shaped MIMO-OTFS Systems."  In IEEE Wireless Communications and Networking Conference (WCNC), Austin, TX, USA, 2022 [Link].
• Shivani Singh, Prem Singh, Saurabh Sahu, Himanshu B. Mishra and K. Vasudevan, "Uplink Transmission in MU Multi-Cell Massive MIMO-FBMC Systems over Ricean Fading."  Accepted for publication in IEEE Vehicular Technology Conference (VTC)-Fall, Norman, OK, USA 2021 [Link].
• Khushboo Yadav, Prem Singh, Himanshu B. Mishra and Rohit Budhiraja,” Closed-Form BER For ZF OTFS Receivers”  in IEEE  International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Lucca, Italy 2021 [Link].
• Prem Singh, Himanshu B. Mishra and Rohit Budhiraja, "Low-Complexity Linear MIMO-OTFS Receiver.” in IEEE International Conference on Communications (ICC) Workshop on OTFS for 6G and Future High-mobility Communications, Montreal, Canada, 2021 [Link].
• Himanshu B. Mishra, Prem Singh, Abhishek K. Prasad, and Rohit Budhiraja, "Iterative Channel Estimation and Data Detection in OTFS Using Superimposed Pilots.” in IEEE International Conference on Communications (ICC) workshop on OTFS for 6G and Future High-mobility Communications, Montreal, Canada, 2021 [Link].
• Prem Singh, Bagadi Usha Rani, Himanshu B. Mishra and K. Vasudevan, "Neighbourhood Detection-based ZF-V-BLAST Architecture for MIMO-FBMC-OQAM Systems." Proc. of IEEE International Conference on Global Communications (GLOBECOM) 2018, Abu Dhabi, UAE [Link].
• Prem Singh and K. Vasudevan. "MIMO-FBMC Channel Estimation with Limited, and Imperfect Knowledge of Channel Correlations." Proc. of 25th IEEE National conference on communications (NCC), 21-24 Feb 2019, Bangalore, India [Link].
• Prem Singh and K. Vasudevan. "CFO and channel estimation for SIMO-FBMC/OQAM systems." Proc. of 23rd IEEE Asia-Pacific Conference on Communications (APCC), pp. 1-6, 2017, Perth, Australia [Link]. 
• Prem Singh and K. Vasudevan. "Frequency Synchronization and Channel Estimation for OFDM/OQAM Signals Transmitted Through Rayleigh Fading Channels." Proc. of 23rd IEEE National conference on communications (NCC), 2017, Chennai, India [Link].
• Prem Singh and K. Vasudevan. "Preamble-based synchronization for OFDM/OQAM systems in AWGN channel." Proc. of 4th IEEE International Conference on Signal Processing and Integrated Networks (SPIN), India, 2017, pp. 60-65 [Link].
• Prem Singh and K. Vasudevan. "Near optimum detection of TCM signals in coloured noise." in IEEE 5th International Conference on Internet Multimedia Systems Architecture and Application, 2011 [Link].
• Patra, Radhashyam, ArunanshuMahapatro, Himanshu B. Mishra, Prem Singh, and Sonali Panda. "PAPR and CCDF Analysis of Superimposed Training Sequence-based MIMO-FBMC OQAM Systems." in IEEE Region 10 Conference (TENCON), pp. 1489-1493, 2019 [Link].

 EC309: Mobile Computing (5G-NR RAN Signaling) (Jan-May 2023)

Due to the various use cases of 5G and beyond wireless systems, the requirements of a communication network are becoming more demanding (with respect to QoS and reliability, etc.).The networks over which the data traverses are becoming heterogeneous since communication devices cross through different versions of cellular networks (3G, 4G, 5G, beyond 5G and WiFi). This leads to complex signalling and system design for 5G and beyond wireless systems. Due to massive demand from customers/users, many companies are working to solve problems related to it. 

This course offers a complete understanding of the 5G Next-Generation Radio Access Network (5G NG-RAN) Signalling of protocols implemented in the NG-RAN. The course presents the 5G architecture with its nodes, interfaces and protocol stacks and describes protocols through the functions and services they provide. The course focuses on the details of the NR interface signalling exchanged between the UE and the network. However, the most important aspects of other NG-RAN interfaces are also covered. Most important network procedures, such as signalling connection establishment, registration, service request and handover, are discussed and presented on signalling diagrams. The course is based on the 3GPP Release 15.

Please scroll down for the course contents and prerequisites

ML Applications for Wireless Communications (Jan-May 2023): Offered to Samsung R&D Bangalore

Overview of ML applications for wireless communication, Data Modelling and linear regression, Vector and matrix form of data modelling, a non-linear response from a linear model, generalization versus overfitting, Cross-validation, regularization, Probabilistic models for regression-generative data modelling, Maximum Likelihood (ML) approach and its application in wireless communication, Uncertainty in parameter estimation, variability in prediction with an example, Why Bayesian Approach for parameter estimation? How prior belief helps in parameter estimation, Conjugate priors, the evolution of posterior distribution, marginal likelihood, Bayesian treatment for linear regression, the marginal likelihood for model selection, Bayesian approach for 5G mMTC systems, Bayesian inference for non-conjugate models, Probabilistic models for classification, maximum a posterior (MAP) for non-conjugate Bayesian learning for wireless receiver design, non-probabilistic classifier-introduction to support vector machine (SVM), soft and hard margin SVMs, Application of SVM in 5G wireless communication for channel estimation, K-means clustering and its application for user scheduling in 5G wireless communication, Latent variable model, EM algorithm and its application in sparse Bayesian learning for wireless channel estimation, Principle Component Analysis.

NC 605: Mobile Computing (5G-Next Generation RAN Signaling) (July-Nov 2022)

Due to the various use cases of 5G and beyond wireless systems, the requirements of a communication network are becoming more demanding (with respect to QoS and reliability, etc.).The networks over which the data traverses are becoming heterogeneous since communication devices cross through different versions of cellular networks (3G, 4G, 5G, beyond 5G and WiFi). This leads to complex signalling and system design for 5G and beyond wireless systems. Due to massive demand from customers/users, many companies are working to solve problems related to it. 

This course offers a complete understanding of the 5G Next-Generation Radio Access Network (5G NG-RAN) Signalling of protocols implemented in the NG-RAN. The course presents the 5G architecture with its nodes, interfaces and protocol stacks and describes protocols through the functions and services they provide. The course focuses on the details of the NR interface signalling exchanged between the UE and the network. However, the most important aspects of other NG-RAN interfaces are also covered. Most important network procedures, such as signalling connection establishment, registration, service request and handover, are discussed and presented on signalling diagrams. The course is based on the 3GPP Release 15.

The tentative course contents are given below:

Overview of 4G/5G Air Interface: Overview of FDMA principles, 4G/5G radio interface introduction: Channel structure (logical channels, transport channels and physical channels), Time domain structure for FDD and TDD, Frequency domain structure, Scheduling Block, Virtual Resource Block (localized and distributed type), System spectral efficiency. Overview of 4G/5G downlink/uplink physical channels and reference signals, an overview of physical layer procedures.
Overview of 4G (LTE)-RAN Signalling: LTE/ System Architecture Evolution (SAE) architecture, LTE protocol architecture, Non-Access Stratum (NAS), Radio Resource Control (RRC), S1 Application Protocol (S1AP), X2 Application Protocol (X2AP), GPRS Tunneling Protocol -Control (GTP-C), Non-3GPP related access, LTE security, Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), Medium Access Control (MAC).

5G Next Generation (NG)-Radio Access Network (RAN) Signalling:
5G system architecture: Overall network architecture, Nodes, functions and interfaces, 5G identities. 5G protocol architecture:  Introduction (SAP, OSI model), NG-RAN protocol layer, Non-access stratum (NAS) and access stratum (AS), User plane Control plane, QoS flow, profile, architecture, Radio interface structure, 3GPP Technical specifications for 5G.

Non-Access Stratum (NAS): Domain selection, Network slicing, 5G Core Network (5GC) mobility management, 5G System (5GS) session management.

Radio Resource Control (RRC): RRC protocol architecture, RRC services and functions, Signalling Radio Bearers (SRBs), RRC procedures and messages. NG

Application Protocol (NGAP): NGAP protocol architecture, NGAP procedures. Xn Application protocol (XnAP): XnAP protocol architecture, XnAP procedures. F1

Application protocol (F1AP): F1AP protocol architecture, F1AP procedures.

Mobility: Intra-NR, measurements, mobility in RRC_IDLE, RRC_INACTIVE and RRC_CONNECTED, Inter RAT, Roaming and access restrictions.

5G security: Security architecture, 5G key hierarchy, Authentication, NAS security, RRC security Security of non-3GPP access

SDAP (Service Data Adaption Protocol): SDAP protocol architecture, SDAP services and functions SDAP procedures, SDAP PDU formats. Packet Data

Convergence Protocol (PDCP): PDCP protocol architecture, PDCP services and functions, PDCP procedures, PDCP PDU formats.

Radio link control (RLC): RLC protocol architecture, RLC services and functions, RLC procedures and parameters, RLC PDU formats.

Medium Access Control (MAC): MAC protocol architecture, MAC services and functions, MAC procedures and parameters, MAC PDU formats

New Radio (NR) physical layer: NR physical layer structure, Downlink physical channels and signals (P-SS, S-SS, PBCH, PT-RS, DM-RS, CSI-RS, PDCCH, PDSCH), Uplink physical channels and signals (PT-RS, DM-RS, SRS, PUCCH, PUSCH, PRACH).

Overview of 5G-NG ORAN Architecture

Prerequisite: Basic knowledge of Computer Networks, but not mandatory.

AI 833: Probabilistic Machine Learning (PML) (Jan-April 2022)

Objective: Probabilistic models for data are ubiquitous in many areas of science and engineering, and specific domains such as visual and language understanding, finance, healthcare, biology, climate informatics, etc.  In machine learning, uncertainty comes in many forms. For example:

• We may want probabilistic predictions (e.g., the probability that a transaction is a fraud)
• We may have imprecise/noisy data. Need to model the noise/uncertainty. Can do it using the appropriate pdf.
• Due to data scarcity, there may be uncertainty in the estimated model parameters and predictions. Thus, we may be interested in learning a probability distribution over parameters and predictions.
• Sequential decision-making: Estimate of model's uncertainty can “guide" us. For Example, given the current estimate of a function uncertainty over the input space, where should we acquire the next observation? 
• Sometimes we may be interested in learning the underlying probability distribution of data.  Learning the distribution can enable us to understand and also generate new data.

Prerequisite: Prior background in machine learning (ideally through formal coursework), and prior exposure to principles of probabilistic modeling. The students are expected to have strong foundations in probability and statistics, linear algebra, and optimization, and must also be proficient in programming in MATLAB or Python.

 EC 303: Principles of Communication Systems (POC) (Jan-April 2022)

Objective: The aim of this course is to make students understand and analyze the fundamentals of analog and digital communication transmitter and receiver designs. The concepts of these designs are used in building 3G, 4G, and 5G wireless systems. The students will learn about the required theoretical tools and engineering challenges in building such wireless communication systems. The students will also have an opportunity to do projects which will allow them to experiment on practical analog and digital communication systems.

Prerequisite: Signals and Systems

 EC 303: Principles of Communication Systems (POC) (Fall-2021)

Objective: The aim of this course is to make students understand and analyze the fundamentals of analog and digital communication transmitter and receiver designs. The concepts of these designs are used in building 3G, 4G, and 5G wireless systems. The students will learn about the required theoretical tools and engineering challenges in building such wireless communication systems. The students will also have an opportunity to do projects allowing them to experiment with practical analog and digital communication systems.

Prerequisite: Signals and Systems

Ongoing Projects

Completed Projects

(2) BBU Design for 5G Testbed

Before joining IIIT Bangalore, I worked in the EE department at IIT Kanpur as a Project Executive Officer on the Indigenous 5G Testbed Project funded by the Department of Telecommunications (DoT), Govt. of India. The project aims to build an end-to-end testbed that closely resembles a real-world 5G deployment including enhanced mobile broadband (eMBB), Ultra low latency communication (URLLC) and Massive machine type communication (mMTC), both in sub 6 GHz and millimeter wave frequency (24.25 GHz to 52.6 GHz) bands. The 5G Testbed hardware is divided into two parts: a remote radio head (RRH) unit and a baseband unit (BBU, which communicate to each other using a highspeed optical fronthaul link. My key contributions for the 5G testbed projects are as follows.

BBU Hardware Design and Testing

The BBU consists of an FPGA-based baseband card and a server, which communicate using a PCIe interface. We designed FPGA based baseband card with PCIe form factor by collaborating with the industries. The baseband card, whose bird eye view is shown below, performs physical laying baseband signal processing at the 5G testbed base station. Nine such baseband cards sit in a server. One server can control nine RRH units (equivalent to 3 cell sites). One BBU can control three cell sites, and if we have to control more cell sites, we can keep stacking multiple servers in a server rack. I also performed complete testing of the baseband card after fabrication.

Fig: Baseband Card (Bird Eye View) 

Design and Testing of 3GPP Complaint Control and Data Channels for 5G-NR

We designed physical layer signal processing algorithms for the control and data channels, namely PDCCH (physical downlink control channel), PUCCH(physical uplink control channel), PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel), using the 3GPP standards (release 15) for 5G-New Radio. The algorithms were designed using Vivado HLS (Xilinx’s high-level synthesis tool) and benchmarked with their respective MATLAB chains, both before and after implementation on the hardware. Various signal processing blocks of the PDSCH, PDCCH and PBCH transmit chains at the base station are shown below.

I am looking for motivated students interested in working on state-of-the-art problems in 5G and next-generation wireless communications systems. There are no specific prerequisites, please send me an email with your resume, if interested. Please see Research/Publications/Cunsultency tabs for more details.

Research Collaborators and Co-authors

• Prof Aditya K. Jagannatham, IIT Kanpur [Link]
• Prof K. Vasudevan, IIT Kanpur [Link]
• Prof Rohit Budhiraja, IIT Kanpur [Link].
• Prof L. Hanzo, University of Southampton, U.K. [Link]
• Dr Himanshu B. Mishra, Assistant Professor, IIT Dhanbad [Link]
• Dr Ekant Sharma, Assistant Professor, IIT Roorkee [Link]
• Suraj Srivastav, Qualcomm [Link]

Education

• July 2014 - June 2020, PhD, Electrical Engineering, IIT Kanpur, India.
• July 2009 - June 2011, M.Tech, Electrical Engineering, IIT Kanpur, India.
• July 2003 - June 2006, B.Tech, Electronics and Communication Engineering, UP Technical University, Lucknow.
• July 1999 - June 2002, Diploma in Electrical Engineering, Board of Technical Education Delhi.

Employment

• July 2021 - Present, Assistant Professor, IIIT Bangalore, India.
• Oct. 2019 - June 2021, Project Executive officer, the Indigenous 5G Testbed project, IIT Kanpur, India.
• Aug. 2011 - July 2014, Assistant Professor, Department of Electronics and Communication Engineering, Graphic Era University Dehradun, India.

Services

Regular reviewer for research articles in

• IEEE Journal on selected areas in communications
• IEEE Transactions on Signal Processing
• IEEE Transactions on Wireless Communications
• IEEE Transactions on Communications
• IEEE Transactions on Vehicular Technology
• IEEE Transactions on Signal and Information Processing over Networks
• IEEE Wireless Communications Letters
• IEEE Communications Letters
• IEEE System Journal
• IEEE Access.

Talks

• [Feb 2024] Invited talk on "Integrated Sensing and Communication for V2X Systems" at IIT Roorkee in association with the IEEE Roorkee Sub-Section and  IEEE COMSOC UP Section.
• [Jan 2024] Invited talk on “Receiver Design for High Mobility Beyond 5G Wireless Communication” in an FDP program at IIT BHU.
• [Dec 2023] Invited talk on “Unlock 5G Excellence with NI SDR and Mantiswave Networks Solutions” at VVDN-NI Academic Conclave on 5G and 6G Research Mumbai.
• [Dec 2023] Invited talk on “Receiver Design for High Mobility Beyond 5G Wireless Communication” at REC, Kannauj under the AICTE-ATAL FDP scheme.
• [Nov 2023] Invited Keynote talk on “Embedded System Design for 5G and Beyond Mobile Communication” at CorEl Education Submit 2023.
• [Sept 2023] Invited talk on "Multi-Port Delay-Doppler Reference Signal Design for MU-OTFS Using Code Domain Orthogonality" in IEEE ELEXCOM'23, IIT Roorkee.
• [August 2023] Invited talk on "Low-Complexity MIMO Receivers for High Mobility Applications" at the University of Luxembourg, Luxembourg.
• [July 2023] Invited talk on "Low-Complexity MIMO Receivers for High Mobility Applications" in Karyashala (High-end workshop) organised by NIT Trichy.
• [June 2023] Invited talk in LRDE DRDO  Bengaluru on "Integrated Sensing and Communication (ISAC) for High Mobility Defense Applications".
• Tutorial on "OTFS aided cell-free massive MIMO for beyond 5G" in COMSNETS 2023.
• Talk on "PHY Layer Processing for 5G-NR Base Station  Design" in Samvaad-2021, IIIT Bangalore [Link]
• Talk on Low-Complexity Linear Receiver Design for MIMO-OTFS Systems n IEEE ICC 2021 Workshop on   OTFS for 6G and Future High-mobility Communications, Montreal, Canada [Link]

• Two research papers got selected by the IEEE Communication Society for the best readings for channel estimation and multiple antenna and multiple access for OTFS and delay-Doppler signal processing.

• The student's paper was one of the finalists for the best student paper award at the IEEE International Conference on Signal Processing and Communications (SPCOM), Bangalore, India, Jul. 2022.

• Finalist (top two) for the Indian National Academy of Engineering (INAE) Innovative Student Project Award 2021 at the doctoral level
• Best PhD Thesis award in the 4th IEEE International Conference on Information and Communication Technology (CICT) 2020 organized by IIIT Kancheepuram, India
• The outstanding teaching Assistant Award in 2019 by the Dept. of EE at the Indian Institute of Technology Kanpur
• Got Excellent Teaching Feedback on the subject of Signals and Systems and Digital Communication during the pre-PhD experience
• Awarded with the Student Travel Grant in 2018 from IEEE ComSoc to present a paper at its flagship conference GLOBECOM
• Served as the Convener of SBRA (hostel for married students at IIT Kanpur) in the session 2016-2017