Research Assistant (Aug€™06 €“ Current), Open Networking Advanced Research Lab, The University of Texas at Dallas.
Advisor : Dr. Andrea Fumagalli
Wireless Sensor Networks
I am currently working on Implementation of a cooperative protocol in Tiny OS. It will then be integrated with UTD Mote System (UTMOST) and a test bed will be created. This will eventually be used for analyzing the performance of cooperative protocols in multi-hop sensor network.
H248 Type Message Encoding and Decoding
I am currently working on defining H248 type messages according to ASN.1 standard. Using a open source asn1c compiler appropriate encoding and decoding routines will be created. This work is done as a part of the development of a software that will enable multimedia delivery.
Wireless Network Simulator:
I was part of the development of a event driven network simulator using C++. This simulator can be used for simulating
€¢ IEEE 802.11 a/b/g/e protocol.
€¢ Cooperative MAC variants like coopMAC, COBRA MAC.
€¢ Single hop and multi hop.
€¢ Routing protocols AODV and OLSR.
€¢ Mobility models random way point and Manhattan grid mobility model
Wireless Network Emulator:
I was part of the development of a wireless network emulator module for Linux in C. This was developed based on NIST NET. It can be used to emulate IEEE 802.11 a/b/g/e protocol.
Cooperative MAC protocols for WLAN
I was part of the development of COBRA MAC, an opportunistic cooperative protocol for WLAN and its application to Multi-Hop Networks. Appropriate rate and relay selection algorithms were also desgined.
Research Assistant (Jun€™05 €“ Jul€™06), Wireless Communication Research Lab, AUKBC Research Center, India
Advisor : Dr. S. Srikanth
Initially Algorithms to estimate carrier frequency offsets in a OFDMA Uplink were studied. An algorithm was studied in detail and its performance analysis was published as a paper in a national level conference.
Our focus then shifted on Initial ranging for OFDMA systems. Initial ranging is the process of detecting any new user in a cell and estimating their timing offset and received power. In this work two methods of Initial Ranging of which one method performs ranging in Time Domain and the other in Frequency Domain were analyzed and a method to improve the performance of Frequency Domain Method was proposed. Using MATLAB, the three methods were simulated and their performance under various conditions were compared. It was shown that our proposed method outperforms the other two methods in terms of performance and computational complexity.