My Ph.D. thesis work was "Analysis of Collisions in Contention-Based Wireless Networks", specifically in the area of Wireless LAN. That work focuses on analysing the different aspects of frame collision in wireless MAC protocol design. In response, we analyse the theoretical performance of the DCF MAC protocol from the packet-centric viewpoint, followed by the design and analysis of performance tuning mechanisms of the IEEE 802.11 DCF and the IEEE 802.11e EDCA protocols. We further analyse and design a scheme for detecting jamming, one of the causes of frame collision, in an energy constrained network.

I summarize the major contributions of this Thesis in the following:

1. I have proposed an absorbing Markov chain-based model to evaluate the packet-centric delay, fairness, trade-offs, and the scope of performance improvement of the IEEE 802.11 DCF channel access protocol form the packet-centric viewpoint.
2. I have designed a backoff scheme, namely semi-distributed backoff (SDB), for performing on-demand sender- and receiver-centric backoff counter selection. Receiver-centric backoff always selects a disjoint set of optimal backoffs for the colliding stations, and, thus, helps in avoiding successive collision in WLANs.
3. With the help of the SDB, I have proposed Semi-DCF MAC protocol for delay sensitive applications in WLANs.
4. In Semi-DCF, on-the-fly migration from random to deterministic backoff provides guaranteed channel access in random access MAC.
5. I have identified the advantages of anomalous slots,, which is in general considered as a cause of performance degradation, in the DCF protocol.
6. I have proposed an anomalous transmission scheme for exploiting the opportunities created by anomalous slots, which, in turn, helps in performance improvement.
7. I have proposed an ad-hoc, distributed, and runtime estimation approach, namely delay deviation ratio, for observing the experienced delay status of a station.
8. I have proposed an approach for avoiding blind update of CW by introducing channel observation-based probabilistic update of CW in the backoff algorithm of the DCF protocol.
9. I have proposed a joint optimization scheme, named delay-aware distributed dynamic adaptation of CW, for improving the saturation throughput and channel access delay of the MAC protocol at runtime.
10. I have proposed a partial-packet-based channel observation metrics for capturing the effect of malicious activity in an energy-constrained wireless network.
11. With the help of partial-packet analysis, I have established that the correct detection of controllable reactive jamming is possible in energy-constrained wireless networks.
12. Finally, I have theoretically analysed the performances of all the proposed solution schemes using the Markov chain model as it suits better for the channel access schemes in WLANs.

I completed the M.Tech. degree in Information Technology from the Purabi Das School of Information Technology (PDSIT) under Bengal Engineering and Science University, Shibpur, in 2007. My days at PDSIT involved intense study as well as dedicated final year research project. Excluding the Data Structure and Programming Language, my favourite course in those days was Network Security. Because of my high competency in programming, other batch mates used to come at me for solving the lab assignments quickly and effectively in time. I picked up a topic for my final year thesis from the research domain while many others chose more on development oriented task. I performed research on Wireless Sensor Network and the thesis was entitled "GSPIN: Gradient-based Sensor Protocol for Information via Negotiation in Wireless Sensor Network". In my final year of postgraduate study, I got an opportunity to teach in an engineering college on part-time basis. I successfully continued both the teaching and research works with a prior permission from my institute. I believe that I managed to handle both ends with equal amount of ease which is another aspect that is highly commendable.

I completed the B.Tech. degree in Computer Science & Engineering from the RCC Institute of Information Technology (RCC-IIT) under the University of Kalyani, India, in 2003. My days at RCC-IIT involved intense study as well as dedicated work on technical projects. My favourite courses in college were Data Structure, Programming Language, Operating Systems, and Computer Networks. I always acquired the highest marks in the subjects of Programming Languages and Data Structure. During the degree programme, I pursued one course-internship in Regional Computer Centre, Jadavpur University Campus, Kolkata. In that programme, I develop an Inventory Control System for the purchase section of the centre. The sound theoretical knowledge from the engineering curriculum and the in-depth practical knowledge from the internship bolstered my basic understanding of computer science.