Research

My research interests revolve around designing, optimizing, testing, validating, and prototyping wireless communication systems and networking protocol with emphasize on the physical and medium access layers. Specific areas include:
  • Internet of Things
  • Vehicular Networks
  • Wireless Sensor Networks
  • Cognitive Radio Networks
  • IEEE 802.11 Networks
  • Cross-Layer PHY/MAC designs for MIMO Networks
  • 4G and LTE cellular Networks
  • Prototyping and Hardware Implementation

Currently Funded Projects

  • Integrated Monitoring System for Plant Disease Forecast

    The goal of this interdisciplinary project is to develop an integrated software/hardware platform to monitor different plant diseases, and to realize an expert system that allows the proposed platform to emulate the decision-making ability of a human expert regarding the diseases. The research components involved in this project include wireless sensor networking and artificial intelligence in addition to agriculture pathology. My research focus is on:

    - Efficient wireless communication between the system modules.

    - Overall system design and integration.

Past Funded Projects

  • Web of Objects

    This multinational project aims at developing a network and services infrastructure for the Internet of Things (IoT). Our goal is simplifying the development and the deployment of distributed applications independent of proprietary protocols. My research focus is on:

    - Autonomous wireless sensor networking with self-X features.

    - Fault/delay tolerant routing for intermittently connected networks.

  • 4G++: Advanced Performance Boosting Techniques in 4th Generation Wireless Systems

    This research project addresses the challenges facing beyond 4G wireless systems and providing protocol design principles and guidelines that can be used by the wireless industry to boost the user experience. My research focus is on:

    - Opportunistic spectrum access in femtocell networks.

    - Spectrum sharing in LTE and LTE-A environments.

    - LTE uplink scheduling and radio resource management.

Other Projects

High Accuracy GPS-Free Vehicle Localization

  • Proposed a GPS-free localization framework that uses two-way time of arrival to locate the vehicles based on communication with a single RSU.
  • Exploited the vehicle kinematics information obtained via the vehicle’s onboard inertial navigation system (INS) to further improve the accuracy.
  • Proposed the protocol implementation of the framework and demonstrated its superior accuracy (as low as 1.8 meters).

Probabilistic Spectrum Management in Distributed Cognitive Wireless Networks

  • Proposed a probabilistic framework for spectrum sensing and access that counters unavoidable inaccuracies of existing spectrum sensing techniques.
  • Analytically optimized the parameters of the proposed scheme.
  • Proposed the protocol implementation of the framework and demonstrated its superior throughput (up to 138% gain) and fairness performance.
  • Empirically demonstrated the superior performance of the proposed framework by implementing it using the Wireless Open Access Research Platform (WARP).

The Case for SIMO Random Access in Multi-hop Wireless Networks

  • Experimentally and analytically demonstrated the superior robustness of SIMO communications to uncoordinated interference compared to MIMO.
  • Proposed simple modifications to the IEEE 802.11n PHY/MAC to enable multiple uncoordinated SIMO flows to concurrently share the medium and alleviate 802.11n severe unfairness.
  • Analytically computed SIMO MAC carrier sense threshold.

Fair Randomized Antenna Allocation in Asynchronous MIMO Multi-hop Networks

  • Experimentally demonstrated high-speed CSMA multi-hop networks, such as IEEE 802.11n, vulnerability to starvation.
  • Presented a framework for randomized resource allocation in asynchronous networks.
  • Proposed the first fair asynchronous multi-antenna MAC. (US patent pending)
  • Modeled the achievable rates of asynchronously interfering MIMO links with the lack of channel state information.

Overhead-Free Congestion Control in Wireless Mesh Networks

  • Experimentally demonstrated and modeled CSMA behavior in multi-hop mesh networks as a distributed almost-strict priority system.
  • Proposed overhead-free congestion control scheme for such systems.

WARP Platform MAC Implementation

  • Implemented the IEEE 802.11 MAC protocol including the physical and virtual carrier sensing, and RTS/CTS four-way handshake on the WARP FPGA-based platform.

Opportunistic Scheduling of Delay Sensitive Traffic in OFDMA-based Wireless Networks

  • Proposed a two-step opportunistic subcarrier allocation and assignment scheme that takes delay information and deadline due violations into account with the channel state information to maximize the system throughput subject to QoS delay constraints.

Channel-Aware Earliest Deadline Due Fair Scheduling for Wireless Multimedia Networks

  • Introduced the channel-dependent earliest-due-date discipline for QoS provisioning for multimedia applications in cellular systems.

Programmable Baseband Chain for a Fully-Integrated Multi-Standard CMOS RF Receiver (Senior Year Dissertation)

  • Designed a reconfigurable baseband chain, with filter, amplifier, and analog to digital converter modules, that can be digitally programmed to operate according to either GSM or DECT standards.