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e-Seminar

An RF FFT Based Architecture for Spectrum Sensing in Software Defined Radios

August 27, 2012
4:00 PM EST (1:00 PM PST)

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Abstract

This e-seminar discusses an RF FFT based receiver front-end to achieve wideband real-time spectrum sensing for SDR applications. In this architecture, the functionality of RF mixers and low pass filters in a multi-channel receiver is replaced with the RF FFT. This not only reduces the power consumption by orders of magnitude but also eliminates the harmonic mixing problem for wideband signals. In conjunction with ADCs to digitize each channel, the architecture effectively achieves a broadband (5 GHz) RF-to-Digital conversion (RF-to-D). In this talk, the performance of this architecture will be explored in a variety of situations (low SNR, large jammer, etc.), and its advantages and disadvantages are outlined. In addition, results from an RF FFT with a 5 GHz input bandwidth and consuming 1 mW power will be presented as a proof of concept.

Speaker

Bodhisatwa Sadhu
University of Minnesota, Minneapolis

Bodhisatwa Sadhu received his B.E.(Hons.) degree in Electrical and Electronics Engineering from Birla Institute of Technology and Science, Pilani, in 2007 and his Ph.D. degree in Electrical Engineering from the University of Minnesota, Minneapolis, in 2012. He is currently a Post-doctoral Researcher at IBM T. J. Watson Research Center, NY. For his Ph.D., he worked on wideband circuits and architectures for software defined radio applications. In 2007, he was with Broadcom Corporation, Bangalore, where he worked on system integration and verification of ethernet switch SoCs. In Fall-2010 and Summer-2011, he was with the Mixed Signal Communications IC Design Group, IBM T. J. Watson Research Center where he worked on the analysis and design of low phase noise frequency synthesizers for 60 GHz and 94 GHz applications. Dr. Sadhu is the recipient of the University of Minnesota Graduate School Fellowship in 2007, 3M Science and Technology Fellowship in 2009 and the University of Minnesota Doctoral Dissertation Fellowship in 2011.