Advanced Wireless System & Networks Lab

A

हिन्दी │Eng

DEPARTMENT OF ELECTRONICS AND COMMUNICATION

INDIAN INSTITUTE OF TECHNOLOGY ROORKEE

Advanced Wireless System & Networks Lab

About

Welcome to the Software Defined Radio (SDR) Lab at the department of Electronics and Communication Engineering at the Indian Institute of Technology Roorkee. We undertake and advance research in the area of Wireless Communications using theoretical and experimental techniques to create novel frameworks for PHY Layer of Wireless Communication Signal Processing specifically for Cell-Free Massive MIMO, Reconfigurable Intelligent Surfaces, Integrated Sensing and Communications, Generative AI for wireless communication signal processing, Hybrid RF/VLC (Visible Light Communication) Systems. We are developing the next generation of wireless communication systems by developing suitable algorithms and evaluating their impact on system performance in terms of outage probability, error rate, throughput, spectral and energy efficiency. This involves developing analytical and empirical models and verifying them using simulations and over-the-air tests. We also develop prototypes and proof-of-concepts using software and hardware such as RFSoC FPGA boards and USRPs.

ONGOING PROJECTS

1. RIS-enabled Hybrid RF/VLC System for Improving QoE
(TCOE, Department of Telecommunications, New Delhi)

2. Cell-Free 6G Access Points C-DoT
(Department of Telecommunications, New Delhi)

3. Inter-AP Co-ordinated Cell-Free 6G Communication for Ubiquitous Connectivity.
(TCOE, Department of Telecommunications, New Delhi)

4. Power-on Pilot IC for Ultra-low Power Wireless IoT Devices
(MEITY, SRIC, IIT Roorkee)

5. Co-existence of CF Massive MIMO with B5G Technologies
(Vritika, SERB, New Delhi)

COMPLETED PROJECTS

1. Deep Learning for Ultra Massive MIMO Systems
(Faculty Initiation Grant, SRIC, IIT Roorkee)

2. Realizing Cell-Free Massive MIMO for Beyond 5G Systems
(Startup Research Grant, SERB, New Delhi)

3. Demystifying CF Communication for 6G&B Systems
(Karyashala, SERB, New Delhi)

4. Co-existence of CF Massive MIMO with B5G Technologies
(Vritika, SERB, New Delhi)

Publication (Journals)

1. Debajit Choudhury and Abhay Kumar Sah, “Beamforming Design for Active STAR-RIS aided CF-mMIMO Networks under Non-Linear Hardware Impairments and Electromagnetic Interference”, IEEE Transactions on Wireless Communications (Early Access)
2. Debajit Choudhury and Abhay Kumar Sah, “Analyzing Energy Efficiency Trade-offs in RIS aided Cell-Free Massive MIMO Networks”, IEEE Transactions on Vehicular Technology, vol. 74, no. 7, pp. 11512-11517, July 2025.
3. S. Dhuli, S. Kouachi, Abhay Kumar Sah, and S. Werner, “Analysis of Exponential Correlation Matrices for Massive MIMO Systems”, IEEE Communications Letters, vol. 29, no. 6, pp. 1345-1349, June 2025.
4. Debajit Choudhury and Abhay Kumar Sah, “Energy Efficient Joint Beamforming Design for Hardware-Impaired STAR-RIS Assisted CF-mMIMO Systems”, IEEE Transactions on Communications, vol. 73, no. 6, pp. 3849-3862, June 2025.
5. Santosh K. Singh and Abhay Kumar Sah, “Distributed Beam combining in Cell-Free Massive MIMO Networks”, IEEE Transactions on Communications, vol. 73, no. 3, pp. 2077-2087, March 2025.
6. Hari Shanker O K and Abhay Kumar Sah, “Multi-User Pairing for NOMA Enabled VLC System”, IEEE Communications Letters, vol. 28, no. 5, pp. 1072-1076, May 2024.
7. Santosh K. Singh, Yallammagari Chakravarthy, and Abhay Kumar Sah, “An Interference Aware User-Group Pilot Assignment for Cell-Free Massive MIMO Systems”, IEEE Wireless Communications Letters, vol. 12, no. 7, pp. 1169-1173, July 2023.
8. R. Gupta, K. Lakshmanan, and Abhay Kumar Sah, “Beam alignment for mmWave using non-stationary bandits”, IEEE Communications Letters, vol. 24, no. 11, pp. 2619-2622, Nov. 2020.
9. Shyam Gadhai, Abhay Kumar Sah, A.K. Singh, R. Budhiraja, and A.K. Chaturvedi, “New Block-based Spatial Modulation”, IEEE Communications Letters, vol. 22, no. 10, pp. 2016 2019, Oct. 2018.
10. Pushpender Mann, Abhay Kumar Sah, R. Budhiraja, and A.K. Chaturvedi, “Bit-level Reduced Neighborhood Search for Low-complexity Detection in Large MIMO Systems”, IEEE Wireless Communications Letters, vol. 7, no. 2, pp. 146-149, Apr. 2018.
11. Abhay Kumar Sah and A.K. Chaturvedi, “Sequential and Global Likelihood Ascent Search based Detection in Large MIMO Systems”, IEEE Transactions on Communications, vol. 66, no. 2, pp. 713-725, Feb. 2018
12. Saksham Agarwal, Abhay Kumar Sah, and A.K. Chaturvedi, “Likelihood Based Tree Search for Low Complexity Detection in Large MIMO Systems”, IEEE Wireless Communications Letters, vol. 6, no. 4, pp. 450-453, Aug. 2017.
13. Abhay Kumar Sah and A.K. Chaturvedi, “An Unconstrained Likelihood Ascent based Detection Algorithm for Large MIMO Systems”, IEEE Transactions on Wireless Communications, vol. 16, no. 4, pp. 2262-2273, Apr. 2017.
14. Abhishek, Abhay Kumar Sah, and A.K. Chaturvedi, “An MMP based Approach for Detection in Large MIMO Systems using Sphere Decoding”, IEEE Wireless Communications Letters, vol. 6, no. 2, pp. 158-161, Apr. 2017.
15. Abhay Kumar Sah and A.K. Chaturvedi, “Quasi-Orthogonal Combining for Reducing RF Chains in Massive MIMO Systems”, IEEE Wireless Communications Letters, vol. 6, no. 1, pp. 126-129, Feb. 2017.
16. Abhay Kumar Sah and A.K. Chaturvedi, “Stopping Rule based Iterative Tree Search for Low Complexity Detection in MIMO Systems”, IEEE Transactions on Wireless Communications, vol. 16, no. 1, pp. 169-179, Jan. 2017.

Team Members (Research Scholars)

1. HARI SHANKAR

2. DEBAJIT CHOUDHARY

3. SHWETA RAI

4. SHAIFALI GUPTA

5. CHAITANYA BHARDWAJ

6. HARI KISHAN REPALA

7. ARUN DESHWAL

Team members (Undergraduate, Postgraduate, and Research Fellows)

1. VISHAL THAKUR (M.Tech)

2. DIVYANSHU SHAMBHARKAR (JRF)

3. HIMESH GANGRADE (JRF)

4. SUHANI AGARWAL (B.Tech)

5. HIMANSHU KUMAR SHEKHAR (Part Time Ph.D)

6. SHRI HARI PANDEY (B.Tech)

7. DAMI REDDY MOHITH REDDY (B.Tech)

8. SUGAMANCHI VENKATA SAI VIVEK (B.Tech)

9. TETARWAL RAJNEESH (B.Tech)

10. SINGARAM S. (Project Associate)

Contact Us
Dr. Abhay Kumar Sah
E-mail: 6g-vigyan@ece.iitr.ac.in
Contact: +91-1332-28-6461
Department of Electronics & Communication
Indian Institute of Technology Roorkee
Haridwar Highway, Roorkee,
Uttarakhand 247667