Nano-scale Device Circuit Interaction

Modeling of process variability of nano-scale CMOS devices and circuits, extraction of SPICE parameters from device simulation data

Development of CAD tools

Development of Matlab-based software tool for performance modeling and optimization of nano-scale analog circuits

Statistical Modeling, Design and Optimization of Nano CMOS Analog/RF Circuits

Funding: Centre for Research in Nanoscience and Nanotechnology, University of Calcutta

Amount: ₹ 2.00 lakh + salary of 1 SRF

Status: Completed

Development of a design automation tool for nano CMOS analog circuits

Funding: Department of Science and Technology under Fast Track Scheme for Young Scientists

Amount: ₹ 12,12,000/-

Duration: 3 years

Status: Continuing

Antenna Research

• Defected Ground Structures (DGS) for Antenna Applications
• Microstrip Antennas using Composite Substrates and composite feed network
• UWB Antennas
• Dielectric Resonator Antennas

SPONSORED PROJECTS

• Mobile Broadband Service Support Over Cognitive Radio Networks funded by Information Technology Research Academy (ITRA), Ministry of Communications and Information Technology, India 2013, Duration: 3 Yrs, Amount: Rs 137.56 lacs

CURRENT PhD STUDENTS

• 6

RESEARCH ACTIVITIES

• i. Practical Implementation of basic wireless communication set up using USRP B210 SDR Kit controlled by GNU Radio software. Some of the experiments include
• 1. A basic cognitive transmission prototype
• 2. Wideband spectrum sensing using polyphase filterbank analyzer.
• 3. Measuring channel impulse response using pn sequence.
• 4. Adaptive modulation
• 5. Amplify-and-Forward, Decode-and-Forward relay
• 6. OFDM transmitter and receiver
• ii. Spectrum occupancy measurement at different places in Kolkata. Measurement has been taken from 1 MHz to 2.5 GHz in four different regions of urban Kolkata. We divide the entire spectra of 2.5 GHz into several 200 MHz subintervals and record the spectrum usage for this frequency interval. The measurements were conducted using a spectrum analyzer and antennas. For low frequencies up to 1 GHz, a fully extended dipole antenna (39") especially designed for TV signal reception is used and for frequencies above 1 GHz a helical antenna is used. We chose four suitable locations in Kolkata for our measurements, one in north Kolkata near Airport, one in central Kolkata at Rajabazar, one in Saltlake which is in the eastern part of the city and the last one is taken at Golf Green in south Kolkata. These different places at different corners of the city will give an indication of the variability of spectrum usage. In the measurement plots we mainly show the received signal level in dB averaged over 2000 samples at each frequency bin and measurements also captured the maximum value of the 2000 samples. The average value of the signal level eliminates burst signal and shows a peak for a steady deterministic signal. On the other hand maximum value is useful to capture burst signal.
• spectrum occupancy in IRPE: IRPE.pdf (click here)
• spectrum occupancy in Saltlake, Kolkata: saltlake.pdf (click here)
• spectrum occupancy in Airport, Kolkata: airport.pdf (click here)
• spectrum occupancy in Golf Green, Kolkata: golf green.pdf (click here)
• free and occupied TV spectrum usage around Kolkata: tv channel.pdf (click here)
• iii. Theoretical research includes
• Rural broadband using TV White Space
• Interference management in cognitive femtocells
• Remote generation of microwave/mm wave signal for mobile broadband
• Fiber to wireless millimeter wave transmitter for pico-cellular mobile broadband
• Indoor Visible Light Communication
• Analog upstream performance of OFDM using RSOA in Passive Optical Network