Thu, 24 Jul 2008 23:18:57 BST CiteULike: dcastros Fishler http://www.citeulike.org/user/dcastro/author/Fishler CiteULike.org en-gb Copyright © 2004-2008 citeulike.org 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 1999 Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE 2 1328 1332 vol.2 cdma kalman location loop mobile multipath radio rake tracking http://www.citeulike.org/user/dcastro/article/2397692 <i>Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on, Vol. 1 (2004), pp. 305-309 Vol.1.</i><br /><br />Inspired by recent advances in multiple-input multiple-output (MIMO) communications, this paper introduces the statistical MIMO radar concept. The fundamental difference between statistical MIMO and other radar array systems is that the latter seek to maximize the coherent processing gain, while statistical MIMO radar capitalizes on the diversity of target scattering to improve radar performance. Coherent processing is made possible by highly correlated signals at the receiver array, whereas in statistical MIMO radar, the signals received by the array elements are uncorrelated. It is well known that in conventional radar, slow fluctuations of the target radar cross-section (RCS) result in target fades that degrade radar performance. By spacing the antenna elements at the transmitter and at the receiver such that the target angular spread is manifested, the MIMO radar can exploit the spatial diversity of target scatterers opening the way to a variety of new techniques that can improve radar performance. In this paper, we focus on the application of the target spatial diversity to improve detection performance. The optimal detector in the Neyman-Pearson sense is developed and analyzed for the statistical MIMO radar. An optimal detector invariant to the signal and noise levels is also developed and analyzed. In this case as well, statistical MIMO radar provides great improvements over other types of array radars. Performance of MIMO radar systems: advantages of angular diversity E Fishler A Haimovich R Blum R Cimini D Chizhik R Valenzuela doi:10.1109/ACSSC.2004.1399142 Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on, Vol. 1 (2004), pp. 305-309 Vol.1. 2008-02-19T08:18:57-00:00 2004 Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on 1 305 309 Vol.1 mimo radar http://www.citeulike.org/user/dcastro/article/670383 <i>Radar Conference, 2004. Proceedings of the IEEE (2004), pp. 71-78.</i><br /><br />It has recently been shown that multiple-input multiple-output (MIMO) antenna systems have the potential to improve dramatically the performance of communication systems over single antenna systems. Unlike beamforming, which presumes a high correlation between signals either transmitted or received by an array, the MIMO concept exploits the independence between signals at the array elements. In conventional radar, target scintillations are regarded as a nuisance parameter that degrades radar performance. The novelty of MIMO radar is that it takes the opposite view; namely, it capitalizes on target scintillations to improve the radar's performance. We introduce the MIMO concept for radar. The MIMO radar system under consideration consists of a transmit array with widely-spaced elements such that each views a different aspect of the target. The array at the receiver is a conventional array used for direction finding (DF). The system performance analysis is carried out in terms of the Cramer-Rao bound of the mean-square error in estimating the target direction. It is shown that MIMO radar leads to significant performance improvement in DF accuracy. MIMO radar: an idea whose time has come E Fishler A Haimovich R Blum D Chizhik L Cimini R Valenzuela Radar Conference, 2004. Proceedings of the IEEE (2004), pp. 71-78. 2006-05-25T18:23:25-00:00 2004 Radar Conference, 2004. Proceedings of the IEEE 71 78 mimo radar