Sat, 26 Jul 2008 06:15:26 BST CiteULike: dcastro's Schultz http://www.citeulike.org/user/dcastro/author/Schultz CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2176491 <i>Communications Magazine, IEEE, Vol. 42, No. 9. (2004), pp. 80-89.</i><br /><br />In recent years, there has been an upsurge of interest in multihop-augmented infrastructure-based networks in both the industry and academia, such as the seed concept in 3GPP, mesh networks in IEEE 802.16, and converge extension of HiperLAN/2 through relays or user-cooperative diversity mesh networks. This article, a synopsis of numerous contributions to the working group 4 of the wireless world research forum and other research work, presents an overview of important topics and applications in the context of relaying. It covers different approaches to exploiting the benefits of multihop communications via relays, such as solutions for radio range extension in mobile and wireless broadband cellular networks (trading range for capacity), and solutions to combat shadowing at high radio frequencies. Furthermore, relaying is presented as a means to reduce infrastructure deployment costs. It is also shown that through the exploitation of spatial diversity, multihop relaying can enhance capacity in cellular networks. We wish to emphasize that while this article focuses on fixed relays, many of the concepts presented can also be applied to systems with moving relays. Relay-based deployment concepts for wireless and mobile broadband radio Relay-based deployment concepts for wireless and mobile broadband radio R Pabst R Pabst BH Walke BH Walke DC Schultz DC Schultz P Herhold H Yanikomeroglu S Mukherjee H Viswanathan M Lott W Zirwas M Dohler A10 H Aghvami A11 DD Falconer A12 GP Fettweis A13 doi:10.1109/MCOM.2004.1336724 Communications Magazine, IEEE, Vol. 42, No. 9. (2004), pp. 80-89. 2007-12-28T05:38:41-00:00 2004 Communications Magazine, IEEE 42 9 80 89 broadband mobile radio http://www.citeulike.org/user/dcastro/article/2988892 <i>Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 3784-3787.</i><br /><br />A new approach to developing miniaturized GPS antennas suitable for use in CRPA anti-jam arrays is presented. The approach leverages recent advances in fragmented aperture antenna design and manufacturing. This approach uses a combination of FDTD simulations combined with genetic optimization. Fragmented aperture antenna design of miniaturized GPS CRPA: model and measurements JG Maloney BN Baker JJ Acree JW Schultz JA Little DD Reuster doi:10.1109/APS.2007.4396363 Antennas and Propagation International Symposium, 2007 IEEE (2007), pp. 3784-3787. 2008-07-11T15:19:01-00:00 2007 Antennas and Propagation International Symposium, 2007 IEEE 3784 3787 antenna gps http://www.citeulike.org/user/dcastro/article/2822767 <i>Physical Review Letters, Vol. 84, No. 18. (1 May 2000), 4184.</i> Composite Medium with Simultaneously Negative Permeability and Permittivity DR Smith Willie Padilla DC Vier SC Nemat-Nasser S Schultz doi:10.1103/PhysRevLett.84.4184 Physical Review Letters, Vol. 84, No. 18. (1 May 2000), 4184. 2008-05-22T10:35:48-00:00 2000 Physical Review Letters 84 18 4184 American Physical Society metamaterial http://www.citeulike.org/user/dcastro/article/2762226 <i>Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 1 (1998), pp. 327-330 vol.1.</i><br /><br />This paper presents several power amplifier approaches that promise to significantly improve efficiency, while meeting the linearity requirements of advanced, spectrally efficient wireless systems. The approaches include: a) use of active integrated antenna structures that provide harmonic terminations for high efficiency Class F amplifiers; b) integrated dc-dc converters for power conditioning and envelope restoration; c) switching mode amplifiers based on bipolar transistors with controlled saturation; and d) the use of band-pass delta-sigma modulators to tailor input signals Device and circuit approaches for improved linearity and efficiency in microwave transmitters PM Asbeck T Itoh Y Qian MF Chang L Milstein G Hanington PF Chen V Schultz DW Lee DW Lee J Arun A10 doi:10.1109/MWSYM.1998.689385 Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 1 (1998), pp. 327-330 vol.1. 2008-05-06T18:30:58-00:00 1998 Microwave Symposium Digest, 1998 IEEE MTT-S International 1 327 330 vol.1 efficiency microwave transmitter http://www.citeulike.org/user/dcastro/article/789143 <i>Science, Vol. 292, No. 5514. (6 April 2001), pp. 77-79.</i><br /><br />10.1126/science.1058847 Experimental Verification of a Negative Index of Refraction RA Shelby DR Smith S Schultz doi:10.1126/science.1058847 Science, Vol. 292, No. 5514. (6 April 2001), pp. 77-79. 2006-08-07T22:09:33-00:00 2001 Science 292 5514 77 79 metamaterial