Douglas Adams

From Murmann Mixed-Signal Group

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BSEE, Massachusetts Institute of Technology, 2009
BSM, Massachusetts Institute of Technology, 2009
MEng, Massachusetts Institute of Technology, 2010
Admitted to Ph.D. Candidacy: 2010-2011

Research: Developing an RF Front-End for Sub-Nyquist Radio

Standard demodulation schemes are incredibly useful for receiving signals that would otherwise be above the sampling rate of available ADCs, however they are typically constrained to a specific bandwidth over the lifetime of the device. Current research in compressed sensing has yielded algorithms that allow frequency-flexible sub-Nyquist sampling schemes. A frequency-flexible receiver can adapt to changing conditions on the fly--moving away from strong interferers or dynamically increasing the transmission bandwidth.

I am working on the Modulated Wideband Converter (MWC) [1], one such Sub-Nyquist topology. The MWC is fantastically flexible receiver architecture, but what it gains in flexibility it pays for in sensitivity, and blocker rejection [2].

MWC Figure.png

MWC Figure2.png

I am researching circuit and system level optimizations that leverage the entire structure of the receiver to improve its performance. Specifically the design of the mixer and the local oscillator signal generation. Through my research I hope to improve the performance of the MWC so that it is competitive with standard receivers, while maintaining its inherent flexibility advantage.

[1] M. Mishali and Y. C. Eldar, “From Theory to Practice: Sub-Nyquist Sampling of Sparse Wideband Analog Signals,” IEEE Journal of Selected Topics in Signal Processing, vol. 4, no. 2, pp. 375-391, Apr. 2010.

[2] D. Adams, C. Park, Y. Eldar, and B. Murmann, "Towards an Integrated Circuit Design of a Compressed Sampling Wireless Receiver," ICASSP, Kyoto, Japan, Mar. 2012.

Email: doadams AT stanford DOT edu

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