Meeting Sehedule 2017


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I4CT PhD graduates, Dr. Kishor P. Patil




Title: Spectrum Utilisation and Management in Cognitive Radio Networks

PhD graduate: Kishor Puna Patil


The demand for radio spectrum for wireless communication is growing due to increase in number of users and popularity of data and multimedia services. Dynamic Spectrum Access/ Cognitive Radio (CR) and the spectrum refarming are the two viable solutions for the current problem of spectrum scarcity. Evaluation of the spectrum usage is the first step toward the future deployment of CR. We address this in the thesis and present reference empirical spectrum occupancy measurements in India and modeling in the context of CR. The work includes the design of the measurement setup and the short and longer time span measurement campaigns at different locations in India with practical scenarios of CR. We evaluate the spectrum usage in different bands allocated to wireless services based on the real time data collected from the measurement. We find a significant amount of spectrum is underutilized and opportunities for the secondary use. We provide the temporal and spatial properties of the spectrum occupancy. We present stochastic duty cycle model based on measurement to identify the potential for CR.

We find a significant amount of spectrum is underutilized and opportunities for the secondary use in India from the spectrum occupancy measurement of TV band. In this work, we propose wireless broadband connectivity to rural areas in India using TV whitespaces and technical and regulatory requirements for CR operation in TV band. We also present implications of CR on spectrum regulation in the context of Indian scenario. We point out the extensive use of spectrum by the mobile cellular services in India showing the popularity of these services. We suggest the demand of additional spectrum for these services can meet through the digital dividend spectrum released from spectrum refarming in TV band. Finally, the developed CTMC based spectrum sharing model derives some important statistics which are beneficial in analyzing the performance of the DSA systems.

Assessment Committee: Habil Walter Konhaüser, PITCcon GmhH, Berlin, Germany,
Professor Kwang-Cheng Chen, National Taiwan University, Taiwan,
Associate Professor Jens Myrup Pedersen, Aalborg University, Denmark (Chairman)

Professor Ramjee Prasad, Aalborg University, Denmark
Professor Knud Erik Skouby, Aalborg University, Denmark
Professor U.B.Desai, IIT, Hyderabad.

Associate Professor Reza Tadayoni, CMI, Aalborg University, Denmark