Wed, 09 Jul 2008 13:39:37 BST CiteULike: dcastros cancellation http://www.citeulike.org/user/dcastro/tag/cancellation CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2855929 <i>Communications, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1516-1524.</i><br /><br />A noncoherent tracking loop with diversity reception and multipath interference cancellation is proposed for direct-sequence spread-spectrum systems on frequency-selective multipath fading channels. The basic idea of the loop is to reproduce the multipath interference and remove it from the received signal, and then a path diversity is embedded in the loop to improve the loop performance. The tracking error performance of the loop is evaluated by linear analyses and computer simulations. Numerical results show that the proposed tracking loop outperforms the traditional delay locked loop and performs very well under all considered fading conditions A noncoherent tracking loop with diversity and multipath interference cancellation for direct-sequence spread-spectrum systems Wern-Ho Sheen Chien-Hsiang Tai doi:10.1109/26.729396 Communications, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1516-1524. 2008-06-02T06:46:07-00:00 1998 Communications, IEEE Transactions on 46 11 1516 1524 cancellation interference loop multipath spread-spectrum tracking http://www.citeulike.org/user/dcastro/article/2421444 <i>Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 30, No. 3. (1982), pp. 469-478.</i><br /><br />Conventional adaptive beamformers utilizing some form of automatic minimization of mean square error exhibit signal cancellation phenomena when adapting rapidly. These effects result from adaptive interaction between signal and interference, when signal and interference are received simultaneously. Similar phenomena have been observed and analyzed in relatively simple adaptive noise cancelling systems. A study of these phenomena in the simpler systems is used to provide insight into similar behavior in adaptive antennas. A method for alleviating signal cancellation has been devised by Duvall, whereby the signal components are removed from the adaptive process, then reinserted to form the final system output. Widrow has devised a different solution to the problem: to move the receiving array spatially (or electronically) to modulate emanations received off the look direction, without distorting useful signals incident from the look direction. This approach is called "spatial dither" and introduces the additional possibility of modulating "smart" jammer signals, thereby limiting their effectiveness. Signal cancellation phenomena in adaptive antennas: Causes and cures B Widrow K Duvall R Gooch W Newman Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Vol. 30, No. 3. (1982), pp. 469-478. 2008-02-24T13:31:07-00:00 1982 Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988] 30 3 469 478 adaptive antenna cancellation signal