Raghav Subbaraman

I am a PhD student at the Wireless Communication, Sensing and Networking Group (WCSNG), part of the Department of Electrical and Computer Engineering at University of California San Diego, where I work on an intersection of spectrum sensing and communication networks. My PhD advisor is Dinesh Bharadia. I am a recipient of the Qualcomm Innovation Fellowship.

I have a B.Tech in Electrical Engineering from Indian Institute of Technology Madras, where I worked in Radha Krishna Ganti's lab and in the 5G Testbed project.

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Research

My expertise and interests lie in applied wireless & networked systems research. In the past, I have worked on projects related to 5G ORAN and inter-operable networks, mmWave networks, and wireless security. My PhD thesis work focuses on building tools and techniques to bridge spectrum awareness into communication networks. Through my research, I show how these tools can be used to improve spectrum usage, spectrum regulation, and wireless security.

Configurable LoRa testbed for reproducible PHY and MAC research

Open sourced an easy-to-use and set-up LoRa testbed developed as an offshoot from BSMA! If you are working on LoRa PHY or MAC layer research and need a testbe to test your systems, consider using this one! It works with all arduino-compatible devices and provides hooks into almost all PHY and MAC parameters.

Crescendo: Towards Wideband, Real-Time, High-Fidelity Spectrum Sensing Systems

In this paper, we discuss the importance of handling power dynamics in spectrum sensing. We then develop Crescendo, a stable sweep-spectrum sensor that can optimize the dynamic range of observation on a time-frequency selective basis.

mmFlexible: Flexible Directional Frequency Multiplexing for Multi-user mmWave Networks

BSMA: scalable LoRa networks using full duplex gateways

This work develops BSMA, a scalable LoRa MAC protocol that uses full duplex gateways to improve network capacity by 100% compared to CSMA in bursty loads. Implementing BSMA requires a full duplex LoRa gateway, which we develop in the 915 MHz ISM band. The implementation of a LoRa BSMA gateway is open source, and works with COTS LoRA devices.

A Hierarchical Self-Interference Canceller for Full-Duplex LPWAN Applications Achieving 52–70-dB RF Cancellation

Two beams are better than one: Towards Reliable and High Throughput mmWave Links

This work develops multi-beamforming as the enabler for reliable, high-throughput mmWave links. We also explore multi-beam maintenance in compliance with 5G-NR.

WiForce: Wireless Sensing and Localization of Contact Forces on a Space Continuum

mMobile: Building a mmWave Testbed to Evaluate and Address Mobility Effects

SweepSense: Sensing 5 GHz in 5 Milliseconds with Low-cost Radios

Design and source code from Jon Barron's website