Sat, 05 Jul 2008 05:44:54 BST CiteULike: dcastro's Andersen http://www.citeulike.org/user/dcastro/author/Andersen CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2923541 <i>Vehicular Technology, IEEE Transactions on, Vol. 36, No. 4. (1987), pp. 149-172.</i><br /><br />The conditions for antenna diversity action are investigated. In terms of the fields, a condition is shown to be that the incident field and the far field of the diversity antenna should obey (or nearly obey) an orthogonality relationship. The role of mutual coupling is central, and it is different from that in a conventional array antenna. In terms of antenna parameters, a sufficient condition for diversity action for a certain class of high gain antennas at the mobile, which approximates most practical mobile antennas, is shown to be zero (or low) mutual resistance between elements. This is not the case at the base station, where the condition is necessary only. The mutual resistance condition offers a powerful design tool, and examples of new mobile diversity antennas are discussed along with some existing designs. Antenna diversity in mobile communications RG Vaughan JB Andersen Vehicular Technology, IEEE Transactions on, Vol. 36, No. 4. (1987), pp. 149-172. 2008-06-24T12:30:49-00:00 1987 Vehicular Technology, IEEE Transactions on 36 4 149 172 antenna diversity http://www.citeulike.org/user/dcastro/article/1474537 <i>Communications Magazine, IEEE, Vol. 33, No. 1. (1995), pp. 42-49.</i><br /><br />The authors describe the type of signals that occur in various environments and the modeling of the propagation parameters. Models are essentially of two classes. The first class consists of parametric statistical models that on average describe the phenomenon within a given error. They are simple to use, but relatively coarse. In the last few years a second class of environment-specific models has been introduced. These models are of a more deterministic nature, characterizing a specific street, building, etc. They are necessarily more time consuming to use, but are also more revealing concerning physical details and hopefully more accurate. Some key parameters and the measurement of them are discussed and then the different wireless environments are treated. The latter topic is divided into outdoor environments, indoor environments, and radio penetration from outdoor to indoor environments Propagation measurements and models for wireless communications channels JB Andersen TS Rappaport S Yoshida Communications Magazine, IEEE, Vol. 33, No. 1. (1995), pp. 42-49. 2007-07-23T09:55:26-00:00 1995 Communications Magazine, IEEE 33 1 42 49 channels communication measurement model propagation wireless