CiteULike: dcastros Bobrovsky http://www.citeulike.org/user/dcastro/author/Bobrovsky CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2782048 <i>Communications, 2007. ICC '07. IEEE International Conference on (2007), pp. 2888-2893.</i><br /><br />The growing demand for reliable communications leads to the need for very large mean time to lose lock (MTLL) of PLL based synchronization subsystems. These large MTLLs, of the order of months, cannot be simulated or tested in a lab. In this work a systematic approach is given to computing the MTLL of a second order PLL with parasitic delay at low SNR and high phase noise. Computed and simulated results are shown to be in good agreement for values that can be simulated. Mean Time to Lose Lock for a PLL with Loop Delay under Thermal and Phase Noise Conditions U Yehuday BZ Bobrovsky J Davidson doi:10.1109/ICC.2007.480 Communications, 2007. ICC '07. IEEE International Conference on (2007), pp. 2888-2893. 2008-05-09T23:56:03-00:00 Communications, 2007. ICC '07. IEEE International Conference on 2888 2893 delay noise phase pll time http://www.citeulike.org/user/dcastro/article/2776180 <i>Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE, Vol. 2 (1999), pp. 1328-1332 vol.2.</i><br /><br />This paper discusses an improved method for localization in a DS-CDMA based cellular-phone communication link. This method suggests an optimization for code synchronization, which allows for TDOA (time difference of arrival) estimations to be solved for the position of a mobile phone. It is known that the time delay of a received DS signal, derived from the classical DLL, may express severe timing errors due to multipath effects. A new anti multipath multi-tracking extended Kalman filter loop is shown to achieve far better results especially in the environment of specular multipath. Specifically, this new loop minimizes the errors due to multipath components by letting the EKF decide upon the best weights of its sub-chip processing branches, resulting in a RAKE-like tracking loop. This loop tracks not only the line of sight path, but also the other multipath components as well as their power and phase. It is shown that the implementation of this technique converges to the classical non-coherent code tracking DLL structure when no multipath is assumed, but results in a new and efficient tracking loop structure in the more realistic fading channel case. The application of this technique to the EIA IS-95 system is considered, where accurate location estimations as well as power management utilities are treated Anti multipath cellular radio location for DS/CDMA systems using a novel EKF subchip RAKE tracking loop E Fishler BZ Bobrovsky doi:10.1109/MILCOM.1999.821419 Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE, Vol. 2 (1999), pp. 1328-1332 vol.2. 2008-05-09T15:42:49-00:00 Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE 2 1328 1332 vol.2 cdma kalman location loop mobile multipath radio rake tracking