Research
I have been involved in several research projects. This page gives a brief summary of some of the projects I am working (or worked) on.
Collaborators
Venkatesh Saligrama (BU)
Masoud Sharif (BU)
Anant Sahai (UCBerkeley)
Andreas Molisch (MERL)
Azer Bestavros (BU)
Abraham Matta (BU)
Hany Morcos (BU)
Shuchin Aeron (BU)
Erhan Ermis (BU)
Kristen Woyach (UCBerkeley)
Research Places
ISS Lab at Boston University
Mitsubishi Electric Research Labs
Alexandria University
CSL at UIUC
Cooperative Communications
Recent advances in wireless communications have allowed a leap in the development and commercialization of many types of wireless networks, including cellular, sensor, military, emergency and community mesh networks. A main observable theme in many of these applications is a paradigm shift from a rigid regulatory framework of competitive/exclusive usage of network resources to a more cooperative/shared resource-pool paradigm. Cooperation refers to active assistance and joint operation of nodes
Spectrum Enforcement in Cognitive Radio Systems
The advent of frequency-agile radios holds potential for improving the utilization of spectrum by allowing wireless systems to dynamically adapt their spectral footprint based on the local conditions. Although a number of approaches ranging from market mechanisms to opportunistic usage have been proposed, a clear picture is emerging, that spectral gains can only be realized through real-time adaptation at runtime. However, this leaves open the major problem of how to enforce/incentivize
Distributed Cache Management in SNETS
We consider a mobile sensor network monitoring a spatio-temporal field. Given limited cache sizes at the sensor nodes, the goal is to develop a distributed cache management algorithm to efficiently answer queries with a known probability distribution over the spatial dimension. First, we propose a novel distributed information theoretic approach (DEBT) in which the nodes locally update their caches based on full knowledge of the space-time distribution of the monitored phenomenon. At each
Adaptive Modulation
Link Adaptation refers to transmission schemes in which the transmitter adapts its mode (Constellation size, rate, code, power etc...) based on channel conditions. High rate transmission could take place when the channel is favorable and during deep fades robust schemes are enabled. This invariably requires channel state information (CSI) at the transmitter side. We studied the performance of adaptive modulation schemes in personal communication systems under various fading conditions and
Target Tracking
In a typical target tracking problem, the presence of random interference introduces uncertainty into the origin of measurements. Data association techniques, together with state estimation, are thus required to associate each measurement with the appropriate target or discard it as arising from clutter (False alarms). Probabilistic Data Association (PDA) is a well-known technique for single target tracking in clutter. Spurious measurements are rejected based on a validation technique that
About this page
My main research interests lie in the field of Wireless Communications, Distributed Signal Processing, Sensor Management, and Network Information Theory. In particular I am interested in cooperative communications in wireless networks, in spectrum agile (cognitive) radios, and in sensor management for surveillance and tracking applications. I am also interested in inference, detection and estimation in distributed uncertain environments under communication and information constraints. My secondary interests include Electromagnetics, Pattern Recognition and Machine Learning.
