SUBHRA SANKHA SARMA

@vit.ac.in

Assistant Professor (Senior)
Vellore Institute of Technology, Vellore

SUBHRA SANKHA SARMA


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https://researchid.co/subhra3s
He is currently working at VIT Vellore as an Assistant Professor Senior Grade 1 in department of Communication. He pursued his PhD at NIT Silchar, India in the department of Electronics & Instrumentation Engineering and worked as a Research Fellow. His research areas include 1) D2D communication, mm-Wave network, 5G/B5G, Power optimization, Interference management, IoT, Industry 5.0, IRS and 2) Holography- digital & conventional, Holographic optical elements, Diffusers, Image enhancement etc.

EDUCATION

National Institute of Technology
Ph.D. – Wireless communication

Assam Don Bosco University,
M.Tech. - Electronics & Communication Engineering

Gautam Budhha Technical University
B.Tech. - Electronics & Instrumentation Engineering

RESEARCH, TEACHING, or OTHER INTERESTS

Electrical and Electronic Engineering, Computer Networks and Communications, Signal Processing, General Engineering
25

Scopus Publications

196

Scholar Citations

8

Scholar h-index

8

Scholar i10-index

Scopus Publications

  • A dual mode approach based efficient relay-aided device-to-device communication in 5G mm-Wave cellular network
    Subhra Sankha Sarma, Ranjay Hazra
    Scientific Reports, 2026
    Relay aided device-to-device (D2D) communication has the potential to increase the capacity and coverage of the network thereby enhancing the quality of service (QoS). Thus, we propose a dual mode scheme (direct and relay mode) for a single cell where D2D and cellular users co-exist in an underlaying 5G mm-Wave cellular network which minimizes the interference. Direct mode operates at 2 GHz carrier frequency while relay mode employs full duplex amplify and forward (FDAF) relay strategy at 28 GHz frequency. The closed form expressions of performance metrices namely, spectral efficiency (SE) and energy efficiency (EE) are derived using stochastic geometry as a tool for both the modes to evaluate the system performance. Expressions for probability distribution function (PDF) and cumulative distribution function (CDF) are also derived. Simulation results suggest that the relay mode exhibits better performance than the direct mode in terms of SE and EE. With an increase in the D2D transmit power; the EE gradually increases to around 180 Mbps/J. The average data rate also increases to around 135 Kbps at D2D power of 250 mW with pathloss attenuation of 2.5. Further, simulation results validate the efficacy of the proposed scheme. Also, comparison of the proposed method with the existing methods depicts better performance of the proposed system.
  • Reinforcement learning based resource allocation scheme for vehicular communication in 5G networks for smart cities
    S. Brindha, P. P. Shehila Nasreen, Paresh Sagar, Subhra Sankha Sarma
    Scientific Reports, 2026
    With an emphasis on improving energy efficiency (EE) and lowering power consumption of rapidly growing connected vehicles and infrastructures, Vehicle-to-Everything (V2X) communication is emerging as a fundamental element in the development of smart cities. This paper introduces an innovative reinforcement learning (RL)-based method for dynamic resource allocation within 5G-enabled V2X networks, focusing on EE and minimizing power consumption. The suggested framework adeptly modifies transmission power, and spectrum allocation in real-time, responding to fluctuating traffic patterns and network demands. By facilitating ongoing learning and decision-making, the RL system guarantees optimal resource utilization while preserving high-quality service and low-latency communication. Q-learning is employed to dynamically regulate power levels in urban vehicular scenarios, taking Doppler shift, user mobility, and changing traffic conditions into account. Experimental evaluations demonstrate a substantial decrease in power consumption and an improvement in network efficiency providing a sustainable solution for smart mobility initiatives, promoting the advancement of greener, more reliable, and energy-efficient urban transportation systems.
  • Efficient Power and Resource Allocation for NOMA-Enabled V2X Communication Networks
    Javed Akhter, Ranjay Hazra, Pratap Khuntia, Shubhra Sankha Sarma
    IEEE Transactions on Consumer Electronics, 2026
    Vehicle-to-Everything (V2X) communication plays a vital role in Internet of Things (IoT)-driven intelligent transportation systems (ITS), enabling the real-time exchange of information among vehicles, infrastructure, and networks. To address the increasing demands for capacity, reliability, and latency in dense vehicular environments, this paper investigates an efficient power and resource allocation framework for NOMA-enabled V2X communication to maximise the energy efficiency (EE) of the system, while maintaining the QoS of vehicular groups (VGs) and Vehicle-to-Infrastructure (V2I) users. To achieve this, we divide the problem into three sub-problems and employ the Dinkelbach technique to solve the EE optimisation. The Concave-Convex Procedure (CCCP) and Lagrange Multiplier technique are used to find the optimal power of VGs and V2I users. A weighted bipartite matching algorithm is used for the spectrum reuse matching problem. Furthermore, the computational complexity of the proposed algorithm is analysed to assess its practical feasibility. The system performance is evaluated in terms of EE under varying path loss exponents, VG transmit power levels, and the number of VGs. System fairness is evaluated in terms of Jain’s Fairness Index (JFI). The simulation results show that the proposed scheme improves in terms of EE while ensuring that the QoS requirements of both VGs and V2I users are met. The proposed scheme is also compared with existing schemes in terms of EE.
  • Stochastic Geometry Based Interference Minimization Scheme for D2D Communication in 5G mm-Wave Network
    Kanchan Aman Kirtikumar, Yash Vardhan Chouksey, Akshhat H. Sharma, Subhra Sankha Sarma
    Lecture Notes in Electrical Engineering, 2026
  • A Review on Malware and Adware Detection Techniques Using Machine Learning
    Dhruv Chaudhary, Yash Jain, Kanishk Bakshi, Ranjay Hazra, Subhra Sankha Sarma
    Smart Innovation Systems and Technologies, 2026
  • Design, fabrication and testing of microwave bandpass filter using metamaterial integrated rectangular waveguide
    Paresh R. Sagar, Arpan H. Shah, Subhra Sankha Sarma
    Frequenz, 2025
    This paper presents RF/Microwave rectangular waveguide bandpass filter integrated with two-layer of periodical metamaterial SRR unit cell structure excited by proper EM wave boundary conditions. A properly constructed PCB-based metamaterial unitcell is integrated as a resonating circuit within a rectangular waveguide WR229. In order to achieve bandpass response, the metamaterial unit cell in the metallic waveguide of the designed RF bandpass filter is kept at λ g /4 spacing. Two open-ring resonators connected by a short stub are used to design the metamaterial unit-cell, which is fabricated on a Rogers 48350B substrate with a dielectric constant of ε r =3.48 and thickness of 1.52 mm. In addition, the metallic cavity generated with the CNC milling technology is zinc-coated to resist oxidation. The experimental results of the final prototype show good agreement with the overall wave modeling results. The proposed RF/microwave waveguide filters operated in the S-band frequency range; therefore, their applicability is recognized in RF sensing device for material characterization.
  • Area spectral efficiency and coverage probability enhancement for indoor industrial internet of things 5G network
    Subhra Sankha Sarma, Sagar Paresh Kumar Ramanbhai, Arpan Shah
    Engineering Research Express, 2025
    This article proposes an efficient resource allocation method for Industrial Internet of Things (IIoT) users to communicate among themselves in an underlaying multi-cell mm-Wave 5G cellular uplink network in an indoor environment for enhancing the coverage probability (CP) and area spectral efficiency (ASE) of the network. The IIoT users act as smart sensors in an indoor urban environment where the exchange of information takes place among each other through the 5G cellular network. Interference contributing factors of the mm-Wave band are also taken into account for analyzing its effect on IIoT users. This strictly limits the network coverage due to signal degradation over long distances. Thus, the expression for CP is derived by employing stochastic geometry methods, which improve network performance. Also, the expression for ASE is computed by deriving the probability density function (PDF) of the signal-to-interference plus noise ratio (SINR) at the IIoT end user. Experimental results show a better output of CP of around 0.98 at 1 dB and 0.68 at 5 dB of transmit power for IIoT users with a pathloss exponent of 4. Furthermore, the system also achieves a maximum ASE value of 452 bps Hz/m2 at a distance of 10 m between the IIoT users with a pathloss exponent of 4. Simulation results validate the obtained theoretical values.
  • Intelligent Reflecting Surface Assisted D2D Communication at mm-Wave Band
    Subhra Sankha Sarma
    Microwave Devices and Circuits for Advanced Wireless Communication Design and Analysis, 2025
    This chapter discusses the application of intelligent reflecting surfaces (IRS) for assisting device-to-device (D2D) communication at millimetre wave (mm-Wave) 5G cellular networks. The IRS appears to be a viable candidate for next generation networks for improving coverage capacity and data rate, which would be essential for providing seamless communication among devices in the 5G network, paving the way for bandwidth intensive applications such as online gaming, holographic telepresence, and so on. The incorporation of IRS technology into a 5G network confronts several challenges, including co-channel interference, blockages, severe pathloss attenuation, channel impairment, etc. These issues can be eradicated or minimized through optimal resource allocation, power optimization, mode selection and interference mitigation approaches. Thus, this chapter analyzes and critically evaluates the various techniques used to enable IRS technology to D2D communication in 5G mm-Wave networks. Furthermore, this chapter also delves into the practical issues of implementing IRS in a 5G network.
  • Power Management Scheme Based on Haversine Formula for D2D Communication in 5G MM-Wave Network
    Rudransh Nawani, Kanishkaa Priyadarshi, Kumar Harsh, Subhra Sankha Sarma
    Proceedings International Conference on Next Generation Communication and Information Processing Incip 2025, 2025
    Device-to-device (D2D) communication plays a piv-otal role in the successful implementation of seamless communication in 5G mm- Wave networks. Enabling D2D communication in 5G mm- Wave network has many obstacles as the transmitted signal gets affected by the environment. One of the key issues is the optimization of the D2D transmit power. In this work, we have optimized the D2D transmit power and derived an expression for the energy efficiency (EE), adhering to quality of service (QoS) constraints. Haversine formula is employed for the determination of the distance between the D2D users. Depending on this factor, mode switching takes place from cellular to mm-Wave frequency. Stochastic geometry is implemented for deriving the required expressions for the outage probability and optimal D2D transmit power. Simulation results also suggest the superior performance of the proposed system model.
  • Assessing and Evaluating IoT Platforms For Greenhouse Monitoring And Control System
    Paresh Sagar, Rahul Ganesh Pavanraju, Nithish Srinivasan, Arpan Shah, Subhra Sankha Sarma, Rahul Manohar
    2025 International Conference on Sensors and Related Networks Sennet 2025 Special Focus on Digital Healthcare 64220, 2025
    The agriculture industry has been prevalent for a very long time, with new innovations and technologies being implemented every day. Farmers play a key part in ensuring the right steps and conditions are maintained to obtain the best crop yield. As cloud technology rapidly advances with innovations and applications, the farming and agriculture industry has also begun implementing these tools to help aid farmers. Here, we simulate a greenhouse environment to compare the different IOT platforms ThingsSpeak, Virtuino IOT and Blynk on parameters like real-time applications, latency delays, ease of use and list the advantages and disadvantages of the platforms. The greenhouse was built to include multiple sensors, LCD display, DC fan, water valve, lights, all connected to a NodeMCU, and connected to the internet using the inbuilt ESP8266 module. The entire system is configured to automate different processes, and present the readings to the user via an interface in the Blynk app and Virtuino app.
  • A Decade Review of Device-to-Device Communication in mm-Wave Network: Challenges and Solutions
    Subhra Sankha Sarma, Ranjay Hazra
    Wireless Personal Communications, 2024
  • D2D Communication in a 5G mm-Wave Cellular Network for Wireless Sensor Networks
    Subhra Sankha Sarma, Atul Sachan, Ranjay Hazra, FA Talukdar, Amrit Mukherjee, Pushpita Chatterjee, Waleed Al-Numay
    IEEE Sensors Journal, 2024
  • Design, Fabrication and Testing of Metamaterial Inspired Microwave Device for Sensor Applications
    Paresh Sagar, Touseef Furqan Ahmed, Rudransh Nawani, Arpan Shah, Subhra Sankha Sarma, Rahul Manohar
    2024 International Conference on Smart Electronics and Communication Systems Isense 2024, 2024
  • Single Mode Optical Fiber based Pulse Width Measurement using AVR Microcontroller
    Jyotiraditya Bordoloi, Vishal Bharadwaj, Ashwin S, Sagar PareshKumar Ramanbhai, Arpan Shah Hasmukh Mayuri, Subhra Sankha Sarma
    2024 2nd International Conference Computational and Characterization Techniques in Engineering and Sciences Ic3tes 2024, 2024
  • Power Optimization in a Multicell D2D Communication for Smart City in an mm-Wave Cellular Network: An mIoT Perspective
    Subhra Sankha Sarma, Ranjay Hazra, Pratik Goswami
    IEEE Internet of Things Journal, 2023
  • Symbiosis Between D2D Communication and Industrial IoT for Industry 5.0 in 5G mm-Wave Cellular Network: An Interference Management Approach
    Subhra Sankha Sarma, Ranjay Hazra, Amrit Mukherjee
    IEEE Transactions on Industrial Informatics, 2022
  • Power control scheme for device-to-device communication using uplink channel in 5G mm-Wave network
    Subhra Sankha Sarma, Pratap Khuntia, Ranjay Hazra
    Transactions on Emerging Telecommunications Technologies, 2022
  • Performance Analysis of DF Relay-Assisted D2D Communication in a 5G mmWave Network
    Subhra Sankha Sarma, Ranjay Hazra, Peter Han Joo Chong
    Future Internet, 2022
  • Intelligent Reflecting Surface at Mm-Wave Band for D2D Communication: An Insight
    Subhra Sankha Sarma, Ranjay Hazra
    Lecture Notes in Electrical Engineering, 2022
  • Pathloss attenuation analysis for D2D communication in 5G mmWave networks
    Subhra Sankha Sarma, Ranjay Hazra
    International Conference on Advanced Communication Technologies and Signal Processing Acts 2020, 2020
  • Interference management for D2D communication in mmWave 5G network: An Alternate Offer Bargaining Game theory approach
    Subhra Sankha Sarma, Ranjay Hazra
    2020 7th International Conference on Signal Processing and Integrated Networks Spin 2020, 2020
  • Interference Mitigation Methods for D2D Communication in 5G Network
    Subhra S. Sarma, Ranjay Hazra
    Advances in Intelligent Systems and Computing, 2020
  • Multi-functional system for persons with disabilities using electroencephalography signals of eye blink
    Subhra Sankha Sarma, Piyush Kant, Anon Rajkumar
    Current Science, 2018
  • Holographic diffuser for multichannel restricted displays
    Indian Journal of Pure and Applied Physics, 2016
  • Scratch enhancement and measurement in periodic and non-periodic optical elements using digital holography
    Sonia Verma, Subhra S Sarma, Rakesh Dhar, Rajkumar
    Optik, 2015

RECENT SCHOLAR PUBLICATIONS

  • Reinforcement learning based resource allocation scheme for vehicular communication in 5G networks for smart cities
    SSS S. Brindha, P. P. Shehila Nasreen, Paresh Sagar
    Scientific Reports , 2026
    2026
  • A dual mode approach based efficient relay-aided device-to-device communication in 5G mm-Wave cellular network
    SS Sarma, R Hazra
    Scientific Reports , 2025
    2025
  • Efficient Power and Resource Allocation for NOMA-Enabled V2X Communication Networks
    J Akhter, R Hazra, P Khuntia, SS Sarma
    IEEE Transactions on Consumer Electronics, 1 , 2025
    2025
    Citations: 1
  • ENERGY-EFFICIENT REINFORCEMENT LEARNING BASED V2X 5G COMMUNICATION FOR AMBULANCE-HOSPITAL NETWORKS
    SS Sarma, B Sundaraganesh, SN Pp, PR Sagar
    IN Patent App. 202,541,082,601 , 2025
    2025
  • Energy-efficient reinforcement learning based v2x 5g communication for ambulance-hospital networks
    SS Sarma, B S, S Nasreen PP, SP Ramanbhai
    IN Patent App. 202,541,082,601 , 2025
    2025
  • Assessing and Evaluating IoT Platforms For Greenhouse Monitoring And Control System
    P Sagar, RG Pavanraju, N Srinivasan, A Shah, SS Sarma, R Manohar
    2025 International Conference on Sensors and Related Networks (SENNET … , 2025
    2025
  • Area spectral efficiency and coverage probability enhancement for indoor industrial internet of things 5G network
    SS Sarma, SP Ramanbhai, A Shah
    Engineering Research Express , 2025
    2025
    Citations: 1
  • Design, fabrication and testing of microwave bandpass filter using metamaterial integrated rectangular waveguide
    PR Sagar, AH Shah, SS Sarma
    Frequenz Journal of RF-Engineering and Telecommunications , 2025
    2025
    Citations: 1
  • Power Management Scheme Based on Haversine Formula for D2D Communication in 5G MM-Wave Network
    R Nawani, K Priyadarshi, K Harsh, SS Sarma
    2025 International Conference on Next Generation Communication & Information … , 2025
    2025
    Citations: 1
  • Stochastic Geometry Based Interference Minimization Scheme for D2D Communication in 5G mm-Wave Network
    KA Kirtikumar, YV Chouksey, AH Sharma, SS Sarma
    International Conference on Emerging Electronics and Automation, 395-407 , 2024
    2024
  • Design, Fabrication and Testing of Metamaterial Inspired Microwave Device for Sensor Applications
    P Sagar, TF Ahmed, R Nawani, A Shah, SS Sarma, R Manohar
    2024 International Conference on Smart Electronics and Communication Systems … , 2024
    2024
  • A Review on Malware and Adware Detection Techniques Using Machine Learning
    D Chaudhary, Y Jain, K Bakshi, R Hazra, SS Sarma
    International Conference on Modeling, Simulation and Optimization, 164-184 , 2024
    2024
  • Single Mode Optical Fiber based Pulse Width Measurement using AVR Microcontroller
    J Bordoloi, V Bharadwaj, SPK Ramanbhai, ASH Mayuri, SS Sarma
    2024 Second International Conference Computational and Characterization … , 2024
    2024
  • Intelligent Reflecting surface assisted D2D communication at mm-Wave band
    SS Sarma
    Microwave Devices and Circuits for Advanced Wireless Communication: Design … , 2024
    2024
    Citations: 1
  • A Decade Review of Device-to-Device Communication in mm-Wave Network: Challenges and Solutions
    SS Sarma, R Hazra
    Wireless Personal Communications 137 (1), 415-440 , 2024
    2024
    Citations: 3
  • METHOD AND SYSTEM FOR ENHANCING NETWORK COVERAGE FOR INDOOR INDUSTRIAL INTERNET OF THINGS 5G NETWORK
    SS Sarma, SP RAMANBHAI
    IN Patent App. 202,441,039,941 , 2024
    2024
  • Microwave sensor for measuring soil moisture
    PR Sagar, SS Sarma, SAH Mayuri
    IN Patent 398722-001 , 2024
    2024
  • D2D communication in a 5G mm-Wave cellular network for wireless sensor networks
    SS Sarma, A Sachan, R Hazra, FA Talukdar, A Mukherjee, P Chatterjee, ...
    IEEE Sensors Journal 24 (5), 5512-5521 , 2023
    2023
    Citations: 15
  • Power optimization in a multicell D2D communication for smart city in an mm-Wave cellular network: An mIoT perspective
    SS Sarma, R Hazra, P Goswami
    IEEE Internet of Things Journal 10 (21), 18686-18694 , 2023
    2023
    Citations: 14
  • Intelligent Reflecting Surface at Mm-Wave Band for D2D Communication: An Insight
    S Sarma, R Hazra
    Emerging Electronics and Automation, LNEE 937 , 2022
    2022
    Citations: 3

MOST CITED SCHOLAR PUBLICATIONS

  • Symbiosis between D2D communication and industrial IoT for industry 5.0 in 5G mm-wave cellular network: An interference management approach
    SS Sarma, R Hazra, A Mukherjee
    IEEE Transactions on Industrial Informatics 18 (8), 5527-5536 , 2021
    2021
    Citations: 46
  • Power control scheme for device-to-device communication using uplink channel in 5G mm-Wave network
    SS Sarma, P Khuntia, R Hazra
    Transactions on Emerging Telecommunications Technologies, 1-18 , 2021
    2021
    Citations: 31
  • Interference management for D2D communication in mmWave 5G network: An Alternate Offer Bargaining Game theory approach
    SS Sarma, R Hazra
    2020 7th international conference on signal processing and integrated … , 2020
    2020
    Citations: 26
  • D2D communication in a 5G mm-Wave cellular network for wireless sensor networks
    SS Sarma, A Sachan, R Hazra, FA Talukdar, A Mukherjee, P Chatterjee, ...
    IEEE Sensors Journal 24 (5), 5512-5521 , 2023
    2023
    Citations: 15
  • Interference Mitigation Methods for D2D Communication in 5G Network
    S Sarma, R Hazra
    Cognitive Informatics and Soft Computing 1040, 521-530 , 2020
    2020
    Citations: 15
  • Scratch enhancement and measurement in periodic and non-periodic optical elements using digital holography
    S Verma, SS Sarma, R Dhar, Rajkumar
    Optik-International Journal for Light and Electron Optics 126 (21), 3283-3287 , 2015
    2015
    Citations: 15
  • Power optimization in a multicell D2D communication for smart city in an mm-Wave cellular network: An mIoT perspective
    SS Sarma, R Hazra, P Goswami
    IEEE Internet of Things Journal 10 (21), 18686-18694 , 2023
    2023
    Citations: 14
  • Performance analysis of DF relay-assisted D2D communication in a 5G mmWave network
    SS Sarma, R Hazra, PHJ Chong
    Future Internet 14 (4), 101 , 2022
    2022
    Citations: 11
  • Pathloss attenuation analysis for D2D communication in 5G mmWave networks
    SS Sarma, R Hazra
    2020 Advanced Communication Technologies and Signal Processing (ACTS), 1-6 , 2020
    2020
    Citations: 8
  • A Decade Review of Device-to-Device Communication in mm-Wave Network: Challenges and Solutions
    SS Sarma, R Hazra
    Wireless Personal Communications 137 (1), 415-440 , 2024
    2024
    Citations: 3
  • Intelligent Reflecting Surface at Mm-Wave Band for D2D Communication: An Insight
    S Sarma, R Hazra
    Emerging Electronics and Automation, LNEE 937 , 2022
    2022
    Citations: 3
  • Multi-functional system for persons with disabilities using EEG signals of eye blink
    subhra sankha sarma, piyush kant, rajkumar
    current science 114 (1), 193-195 , 2018
    2018
    Citations: 2
  • Efficient Power and Resource Allocation for NOMA-Enabled V2X Communication Networks
    J Akhter, R Hazra, P Khuntia, SS Sarma
    IEEE Transactions on Consumer Electronics, 1 , 2025
    2025
    Citations: 1
  • Area spectral efficiency and coverage probability enhancement for indoor industrial internet of things 5G network
    SS Sarma, SP Ramanbhai, A Shah
    Engineering Research Express , 2025
    2025
    Citations: 1
  • Design, fabrication and testing of microwave bandpass filter using metamaterial integrated rectangular waveguide
    PR Sagar, AH Shah, SS Sarma
    Frequenz Journal of RF-Engineering and Telecommunications , 2025
    2025
    Citations: 1
  • Power Management Scheme Based on Haversine Formula for D2D Communication in 5G MM-Wave Network
    R Nawani, K Priyadarshi, K Harsh, SS Sarma
    2025 International Conference on Next Generation Communication & Information … , 2025
    2025
    Citations: 1
  • Intelligent Reflecting surface assisted D2D communication at mm-Wave band
    SS Sarma
    Microwave Devices and Circuits for Advanced Wireless Communication: Design … , 2024
    2024
    Citations: 1
  • Holographic diffuser for multichannel restricted displays
    SS Sarma, S Verma, R kumar
    NISCAIR-CSIR, India , 2016
    2016
    Citations: 1
  • Design and recording of holographic diffuser for controlled angular distribution of light
    SS Sarma, DP Chhachhia, Rajkumar
    ADBU-Journal of Engineering Technology (AJET) 1 (1), 18-20 , 2014
    2014
    Citations: 1
  • Reinforcement learning based resource allocation scheme for vehicular communication in 5G networks for smart cities
    SSS S. Brindha, P. P. Shehila Nasreen, Paresh Sagar
    Scientific Reports , 2026
    2026

INDUSTRY EXPERIENCE

Focus Energy Ltd., New Delhi
Instrumentation Engineer