Welcome to My Site!

I am a fifth-year Ph.D. student in Electrical engineering and Computer Science at the University of Minnesota under the supervision of Prof. Soheil Mohajer. I have received a B.Sc. in Electrical Engineering and Mathematics from Isfahan University of Technology, Iran, in 2014. My research is in the area of information theory and its applications in distributed storage systems, communication, and machine learning.

Research Summary

An enormous amount of digital data is generated by Internet users on a daily basis. Such a huge size of data is being processed and stored by data-driven applications. On the other hand, the number of users interested in accessing such data in key internet application, such as Facebook, is dramatically increasing. Distributed Storage Systems (DSS) are widely being used as the backbone of such large-scale storage systems, in order to provide reliability and data availability.

While storage units are individually unreliable and subject to transient or permanent failures, the data must be protected and made available for users’ access. This can be done by introducing redundancy in the data, which leads to a storage overhead. In addition, a considerable volume of network traffic is dedicated to the repair of failed storage nodes, as failures occur frequently in large-scale storage systems. While it is desired to simultaneously minimize the repair bandwidth and maximize the storage efficiency of the system, it is shown that there is a trade-off between them, and one can be optimized only at the cost of a loss in the other.

We have designed a novel coding scheme, called Determinant Coding, for distributed storage systems. Our construction provides encoding/decoding algorithms for storage as well as an efficient mechanism for the repair of failed storage units. These universally structured codes can operate in all the optimum points of the storage-bandwidth trade-off.

What’s new?

The full version of my papers "Cascade Codes For Distributed Storage Systems" and "Determinant Codes with Helper-Independent Repair for Single and Multiple Failures" are now available in the publications section of my website.