Lavaei, Javad and Babakhani, Aydin and Hajimiri, Ali and Doyle, John C. (2010) A Study of Near-Field Direct Antenna Modulation Systems Using Convex Optimization. In: 2010 American Control Conference (ACC). Proceedings of the American Control Conference . IEEE , pp. 1065-1072. ISBN 978-1-4244-7426-4 http://resolver.caltech.edu/CaltechAUTHORS:20110412-144235909
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This paper studies the constellation diagram design for a class of communication systems known as near-field direct antenna modulation (NFDAM) systems. The modulation is carried out in a NFDAM system by means of a control unit that switches among a number of pre-designed passive controllers such that each controller generates a desired voltage signal at the far field. To find an optimal number of signals that can be transmitted and demodulated reliably in a NFDAM system, the coverage area of the signal at the far field should be identified. It is shown that this coverage area is a planar convex region in general and simply a circle in the case when no constraints are imposed on the input impedance of the antenna and the voltage received at the far field. A convex optimization method is then proposed to find a polygon that is able to approximate the coverage area of the signal constellation diagram satisfactorily. A similar analysis is provided for the identification of the coverage area of the antenna input impedance, which is beneficial for designing an energy-efficient NFDAM system.
|Item Type:||Book Section|
|Additional Information:||© 2010 AACC. Issue Date: June 30 2010-July 2 2010. Date of Current Version: 29 July 2010. This research was supported by ONR MURI N00014-08- 1-0747 “Scalable, Data-driven, and Provably-correct Analysis of Networks,” ARO MURI W911NF-08-1-0233 “Tools for the Analysis and Design of Complex Multi-Scale Networks,” and the Army’s W911NF-09-D-0001 Institute for Collaborative Biotechnology.|
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|Official Citation:||Lavaei, J.; Babakhani, A.; Hajimiri, A.; Doyle, J.C.; , "A study of near-field direct antenna modulation systems using convex optimization," American Control Conference (ACC), 2010 , vol., no., pp.1065-1072, June 30 2010-July 2 2010 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5530766&isnumber=5530425|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||26 May 2011 19:18|
|Last Modified:||26 May 2011 19:18|
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