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Proceedings Paper

Frequency position modulation using multi-spectral projections
Author(s): Joel Goodman; Crystal Bertoncini; Michael Moore; Bryan Nousain; Gregory Cowart
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Paper Abstract

In this paper we present an approach to harness multi-spectral projections (MSPs) to carefully shape and locate tones in the spectrum, enabling a new and robust modulation in which a signal's discrete frequency support is used to represent symbols. This method, called Frequency Position Modulation (FPM), is an innovative extension to MT-FSK and OFDM and can be non-uniformly spread over many GHz of instantaneous bandwidth (IBW), resulting in a communications system that is difficult to intercept and jam. The FPM symbols are recovered using adaptive projections that in part employ an analog polynomial nonlinearity paired with an analog-to-digital converter (ADC) sampling at a rate at that is only a fraction of the IBW of the signal. MSPs also facilitate using commercial of-the-shelf (COTS) ADCs with uniform-sampling, standing in sharp contrast to random linear projections by random sampling, which requires a full Nyquist rate sample-and-hold. Our novel communication system concept provides an order of magnitude improvement in processing gain over conventional LPI/LPD communications (e.g., FH- or DS-CDMA) and facilitates the ability to operate in interference laden environments where conventional compressed sensing receivers would fail. We quantitatively analyze the bit error rate (BER) and processing gain (PG) for a maximum likelihood based FPM demodulator and demonstrate its performance in interference laden conditions.

Paper Details

Date Published: 19 October 2012
PDF: 11 pages
Proc. SPIE 8514, Satellite Data Compression, Communications, and Processing VIII, 85140C (19 October 2012); doi: 10.1117/12.928871
Show Author Affiliations
Joel Goodman, U.S. Naval Research Lab. (United States)
Crystal Bertoncini, U.S. Naval Research Lab. (United States)
Michael Moore, Georgia Institute of Technology (United States)
Bryan Nousain, U.S. Naval Research Lab. (United States)
Gregory Cowart, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 8514:
Satellite Data Compression, Communications, and Processing VIII
Bormin Huang; Antonio J. Plaza; Carole Thiebaut, Editor(s)

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