Title :
Angle and delay estimation of space-time channels for TD-CDMA systems
Author :
Picheral, José ; Spagnolini, Umberto
Author_Institution :
Ecole Superieure d´´Electricite, Gif sur Yvette, France
fDate :
5/1/2004 12:00:00 AM
Abstract :
In mobile communications the antenna arrays make it possible to estimate the path delay, angle of arrival (or angle), and amplitude for the multipath propagation channel. This paper considers the problem of joint angle and delay estimation (JADE) in a time-division code-division multiple access system. The angle/delay estimation is made from multiple slots by exploiting the angle/delay invariance of the channel regardless of the fast faded amplitude variation (i.e., angle/delay is assumed quasistatic). JADE can be approximated by methods that estimate the frequencies of the two-dimensional complex sinusoids where the faded amplitudes act as sources. The shift invariance method (JADE-ESPRIT) is chosen for its capacity to pair delay and angle for each path and each user. The consistency of JADE-ESPRIT for a large enough number of slots guarantees the feasibility of the method for spatially correlated noise. The performance of the JADE method for channel estimation is evaluated analytically and numerically in propagation environments with increasing complexity.
Keywords :
antenna theory; array signal processing; channel estimation; code division multiple access; delay estimation; direction-of-arrival estimation; fading channels; frequency estimation; maximum likelihood estimation; mobile communication; multipath channels; time division multiple access; angle of arrival; antenna arrays; delay estimation; joint angle estimation; mobile communication; multipath propagation channel; multiuser detection; path delay; space time channel estimation; time division code division multiple access system; Amplitude estimation; Antenna arrays; Antennas and propagation; Delay estimation; Frequency estimation; Mobile antennas; Mobile communication; Multiaccess communication; Propagation delay; Working environment noise; Array processing; CDMA; TD-CDMA; TDMA; code-division multiple access; delay estimation; direction of arrival; location methods; multiuser detection; space–time channel estimation; third generation system; time-division code division multiple access; time-division multiple access;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2004.826320