Tingjun Chen

Conference Proceedings of the ACM Conference on AI and Agentic Systems Cais 2026 · May 26, 2026 Large language models (LLMs) and agentic systems have shown promise for automated software development, but applying them to hardware-in-the-loop (HIL) embedded and Internet-of-Things (IoT) systems remains challenging due to the tight coupling between soft ... Full text Cite

DecodeX: Exploring and Benchmarking of LDPC Decoding Across CPU, GPU, and ASIC Platforms

Conference Hotmobile 2026 Proceedings of the 2026 ACM 27th International Workshop on Mobile Computing Systems and Applications · March 2, 2026 Emerging virtualized radio access networks (vRANs) demand flexible and efficient baseband processing across heterogeneous compute substrates, where low-density parity-check (LDPC) decoding in the Physical layer remains one of the most performance- and ener ... Full text Cite

IoT-MCP: Bridging LLMs and IoT Systems Through Model Context Protocol

Conference Wintech 2026 Proceedings of the 2025 ACM Workshop on Wireless Network Testbeds Experimental Evaluation and Characterization · November 3, 2025 The integration of Large Language Models (LLMs) with Internet-of-Things (IoT) systems faces significant challenges in hardware heterogeneity and control complexity. The Model Context Protocol (MCP) emerges as a critical enabler, providing standardized comm ... Full text Cite

Mambas: Maneuvering Analog Multi-User Beamforming using an Array of Subarrays in mmWave Networks

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 Beyond-5G and 6G wireless networks exploit the millimeter-wave (mmWave) frequency bands to achieve significantly improved data rates, and existing mmWave systems rely on analog single-user beamforming (SUBF) or hybrid multi-user beamforming (MUBF). In this ... Full text Cite

RadCloud: Real-Time High-Resolution Point Cloud Generation Using Low-Cost mmWave Radars for Aerial and Ground Vehicles

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 We demonstrate RadCloud, a real-time framework for obtaining high-resolution lidar-like 2D point clouds from low-resolution millimeter-wave (mmWave) radar data on resource-constrained platforms commonly found on unmanned aerial and ground vehicles (UAVs an ... Full text Cite

Demo: Experimentation with Mobile 28 GHz Phased Array Antenna Modules

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 We present experiments using mobile 28 GHz Phased Array Antenna Modules (PAAMs), demonstrating their ability to perform beam steering with high granularity. The mobile node contains a 64-element IBM 28 GHz PAAM along with a USRP software defined radio, all ... Full text Cite

28 GHz Phased Array Interference Measurements and Modeling for a NOAA Microwave Radiometer in Manhattan

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 A microwave radiometer (MWR) at NOAA-CESSRST in Manhattan, NYC has experienced interference from nearby sources operating in the 5G FR2 n257 band (26.50 - 29.50 GHz). In this poster, we produce interference using a mobile 28 GHz IBM Phased Array Antenna Mo ... Full text Cite

Real-time Wideband Software-defined Radio with Python Programmability based on RFSoC

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 Next-generation wireless networks necessitate large signal bandwidth to support the growing demands of high data rates, which poses significant challenges in the design of real-time radio platforms. We demonstrate SPEAR, a realtime wideband software-define ... Full text Cite

SPEAR: Software-defined Python-Enhanced RFSoC for Wideband Radio Applications

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 Next-generation wireless systems utilize large signal band-widths to meet the growing data rate demands of emerging applications and to provide enhanced resolution for wireless sensing and imaging. This poses significant challenges in the design of the und ... Full text Cite

DeepMon: Wi-Fi Monitoring Using Sub-Nyquist Sampling Rate Receivers with Deep Learning

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 Next-generation Wi-Fi networks employ large signal bandwidth to meet the demands of high data rates, which poses challenges to Wi-Fi monitoring systems that typically rely on a full sampling rate receiver (RX) to capture signals at full bandwidth for demod ... Full text Cite

Savannah: A Real-time Programmable mmWave Baseband Processing Framework

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 5G new radio (NR) frequency range 2 (FR2) in the millimeter-wave (mmWave) band has a much shorter baseband processing deadline compared to that in the sub-7 GHz FR1 band. This tight deadline requires an efficient real-time system for baseband processing us ... Full text Cite

Federated Black-box Prompt Tuning System for Large Language Models on the Edge

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 Federated learning (FL) offers a privacy-preserving way to train models across decentralized data. However, fine-tuning pre-trained language models (PLMs) in FL is challenging due to restricted model parameter access, high computational demands, and commun ... Full text Cite

Savannah: Efficient mmWave Baseband Processing with Minimal and Heterogeneous Resources

Conference ACM Mobicom 2024 Proceedings of the 30th International Conference on Mobile Computing and Networking · December 4, 2024 5G new radio (NR) employs frequency range 2 (FR2) in the millimeter-wave (mmWave) bands, which employs a much shorter slot duration compared to FR1 (sub-7 GHz) systems and, therefore, poses significant challenges for softwarized baseband processing in virt ... Full text Cite

Swirls: Sniffing Wi-Fi Using Radios with Low Sampling Rates

Conference Proceedings of the International Symposium on Mobile Ad Hoc Networking and Computing Mobihoc · October 16, 2023 Next-generation Wi-Fi systems embrace large signal bandwidth to achieve significantly improved data rates, while requiring efficient methods for network monitoring and spectrum sharing applications. A radio receiver (RX) operating at low sampling rates can ... Full text Cite

Optimizing Sectorized Wireless Networks: Model, Analysis, and Algorithm

Conference Proceedings of the International Symposium on Mobile Ad Hoc Networking and Computing Mobihoc · October 16, 2023 Future wireless networks need to support the increasing demands for high data rates and improved coverage. One promising solution is sectorization, where an infrastructure node (e.g., a base station) is equipped with multiple sectors employing directional ... Full text Cite

Programmable Millimeter-Wave MIMO Radios with Real-Time Baseband Processing

Conference ACM Wintech 2023 Proceedings of the 2023 17th ACM Workshop on Wireless Network Testbeds Experimental Evaluation and Characterization Part of Mobicom 2023 · October 2, 2023 Baseband processing is one of the most time-consuming and computationally expensive tasks in radio access networks (RANs), which is typically realized in dedicated hardware. The concept of virtualizing the RAN functions by moving their computation to edge ... Full text Cite

Hybrid Scheduling in Heterogeneous Half-and Full-Duplex Wireless Networks

Conference Proceedings IEEE INFOCOM · October 8, 2018 Full-duplex (FD) wireless is an attractive communication paradigm with high potential for improving network capacity and reducing delay in wireless networks. Despite significant progress on the physical layer development, the challenges associated with dev ... Full text Cite

Full duplex circulator-receiver phased array employing self-interference cancellation via beamforming

Conference Digest of Papers IEEE Radio Frequency Integrated Circuits Symposium · August 7, 2018 In this paper, we show how phased-array beamforming can be synergistically combined with full-duplex (FD) to achieve wideband RF self-interference (SI) suppression with minimal link budget (transmitter (TX) and receiver (RX) array gain) penalty and with no ... Full text Cite

Demo abstract: Open-access full-duplex wireless in the ORBIT testbed

Conference INFOCOM 2018 IEEE Conference on Computer Communications Workshops · July 6, 2018 In order to support experimentation with full-duplex (FD) wireless, we integrated an open-access FD transceiver with the ORBIT testbed [1]. In particular, an ORBIT node with a National Instruments (NI)/Ettus Research Universal Software Radio Peripheral (US ... Full text Cite

Demo abstract: Full-duplex with a compact frequency domain equalization-based RF canceller

Conference 2017 IEEE Conference on Computer Communications Workshops INFOCOM Wkshps 2017 · November 20, 2017 This demonstration presents a practical real-time full-duplex wireless link consisting of two full-duplex transceivers. Our prototyped full-duplex transceiver contains a custom-designed RF self-interference canceller and a National Instruments (NI) Univers ... Full text Cite

Performance Evaluation of Energy-Constrained Broadcast (EconCast) in Wireless Networks

Conference 2017 IEEE Wireless Communications and Networking Conference Workshops Wcncw 2017 · May 3, 2017 Wireless object tracking applications are gaining popularity and will soon utilize emerging ultra-low-power device-to-device communication. However, severe energy constraints require much more careful accounting of energy usage than what prior art provides ... Full text Cite

Full-duplex in a hand-held device - From fundamental physics to complex integrated circuits, systems and networks: An overview of the Columbia FlexICoN project

Conference Conference Record Asilomar Conference on Signals Systems and Computers · March 1, 2017 Full-duplex wireless is an exciting emerging wireless communication paradigm that also poses tremendous challenges at virtually every layer: from the antenna interface and integrated circuits (ICs) and systems to the network layer. This paper covers recent ... Full text Cite

Maximizing broadcast throughput under ultra-low-power constraints

Conference Conext 2016 Proceedings of the 12th International Conference on Emerging Networking Experiments and Technologies · December 6, 2016 Wireless object tracking applications are gaining popularity and will soon utilize emerging ultra-low-power deviceto- device communication. However, severe energy constraints require much more careful accounting of energy usage than what prior art provides ... Full text Cite

Demo Abstract: Power-Aware neighbor discovery for energy harvesting things

Conference Proceedings of the 14th ACM Conference on Embedded Networked Sensor Systems Sensys 2016 · November 14, 2016 Object tracking applications are gaining popularity and will soon utilize energy harvesting low-power wireless nodes where power is mostly consumed for neighbor discovery. Such applications require the design and experimentation with low-power neighbor dis ... Full text Cite

Full-duplex wireless: Algorithms and rate improvement bounds for integrated circuit implementations

Conference Proceedings of the Annual International Conference on Mobile Computing and Networking MOBICOM · October 3, 2016 Full-duplex (FD) communication can substantially improve spectrum efficiency in wireless networks. Designing higher layer algorithms (e.g., for power control and scheduling) tailored for FD requires taking into account the special characteristics of the ph ... Full text Cite

Panda: Neighbor discovery on a power harvesting budget

Conference Proceedings IEEE INFOCOM · July 27, 2016 Object tracking applications are gaining popularity and will soon utilize Energy Harvesting (EH) low-power nodes that will consume power mostly for Neighbor Discovery (ND) (i.e., identifying nodes within communication range). Although ND protocols were dev ... Full text Cite

Demo: Full-Duplex Wireless based on a Small-Form-Factor Analog Self-Interference Canceller

Conference Proceedings of the International Symposium on Mobile Ad Hoc Networking and Computing Mobihoc · July 5, 2016 A demonstration of a real-time full-duplex wireless link is presented, in which a pair of full-duplex transceivers perform simultaneous transmission and reception on the same frequency channel. A full-duplex transceiver is composed of a custom-designed sma ... Full text Cite

Power control policies for a wireless link with energy harvesting transmitter and receiver

Conference 2014 12th International Symposium on Modeling and Optimization in Mobile Ad Hoc and Wireless Networks Wiopt 2014 · January 1, 2014 This paper addresses the outage minimization problem for a wireless link where both the transmitter and the receiver are powered by harvested energy, and the energy arrival processes of both nodes are correlated. We propose three power control policies to ... Full text Cite