Low-Power Systems

The center develops hardware and software designs for energy-efficient mobile systems. These include low-power handsets, energy-scavenging sensors, and wireless medical devices.

IMDShield: Securing Implantable Medical Devices

Dina Katabi

IMDShield explores the feasibility of protecting IMDs without modifying them by implementing security mechanisms entirely on an external device. Such an approach enhances the security of IMDs for patients who already have them, empowers medical personnel to access a protected IMD by removing the external device or powering it off, and does not in itself increase the risk of IMD recalls.

Aggregation in Dynamic Networks

Calvin Newport

The aggregation problem assumes that every process starts an execution with a unique token (an abstraction for data). The goal is to collect these tokens at a minimum number of processes by the end of the execution. This problem is particularly relevant to mobile networks where peer-to-peer communication is cheap (e.g., using 802.11 or Bluetooth), but uploading data to a central server can be costly (e.g., using 3G/4G). With this in mind, we study this problem in a dynamic network model, in which the communication graph can change arbitrarily from round to round.


Christine Daniloff

Efficient and Reliable Backscatter Networks

Dina Katabi

There is a long-standing vision of embedding backscatter nodes like RFIDs into everyday objects to build ultralow power ubiquitous networks. A major problem that has challenged this vision is that backscatter communication is neither reliable nor efficient. Backscatter nodes cannot sense each other, and hence tend to suffer from colliding transmissions. Further, they are ineffective at adapting the bit rate to channel conditions, and thus miss opportunities to increase throughput, or transmit above capacity causing errors.

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