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A Nonuniform Sampler for Wideband Spectrally-Sparse Environments

Wakin, Michael and Becker, Stephen and Nakamura, Eric and Grant, Michael and Sovero, Emilio and Ching, Daniel and Yoo, Juhwan and Romberg, Justin and Emami-Neyestanak, Azita and Candès, Emmanuel (2012) A Nonuniform Sampler for Wideband Spectrally-Sparse Environments. IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2 (3). pp. 516-529. ISSN 2156-3357.

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We present a wide bandwidth, compressed sensing based nonuniform sampling (NUS) system with a custom sample-and-hold chip designed to take advantage of a low average sampling rate. By sampling signals nonuniformly, the average sample rate can be more than a magnitude lower than the Nyquist rate, provided that these signals have a relatively low information content as measured by the sparsity of their spectrum. The hardware design combines a wideband Indium-Phosphide heterojunction bipolar transistor sample-and-hold with a commercial off-the-shelf analog-to-digital converter to digitize an 800 MHz to 2 GHz band (having 100 MHz of noncontiguous spectral content) at an average sample rate of 236 Ms/s. Signal reconstruction is performed via a nonlinear compressed sensing algorithm, and the challenges of developing an efficient implementation are discussed. The NUS system is a general purpose digital receiver. As an example of its real signal capabilities, measured bit-error-rate data for a GSM channel is presented, and comparisons to a conventional wideband 4.4 Gs/s ADC are made.

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Emami-Neyestanak, Azita0000-0003-2608-9691
Additional Information:©2012 IEEE. Manuscript received February 28, 2012; revised June 29, 2012; accepted July 30, 2012. Date of publication September 28, 2012; date of current version December 05, 2012. This work was supported by the DARPA/MTO Analog-to-Information Receiver Development Program under Air Force Research Laboratory (AFRL) Contract FA8650–08-C-7853. The views expressed in this paper are those of the authors and do not reflect the official policy or position of the Department of Defense or the U.S. Government. This is in accordance with DoDI 5230.29, January 8, 2009. Statement “A” (Approved for Public Release, Distribution Unlimited) [DISTAR case #18837]. This paper was recommended by Guest Editor G. Setti.
Funding AgencyGrant Number
DARPA/MTO Analog-to-Information Receiver Development ProgramFA8650-08-C-7853
Subject Keywords:Compressed sensing, indium-phosphide heterojunction bipolar transistor (HBT), nonuniform sampler, sampleand- hold, wideband analog-to-digital converter (ADC)
Record Number:CaltechAUTHORS:20140609-105129507
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46149
Deposited By: Kristin Buxton
Deposited On:09 Jun 2014 18:23
Last Modified:24 Mar 2015 22:49

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