Title :
Multislot estimation of fast-varying space-time channels in TD-CDMA systems
Author :
Nicoli, M. ; Simeone, O. ; Spagnolini, U.
Author_Institution :
Dipt. di Elettronica e Inf., Politecnico di Milano, Italy
Abstract :
We propose a subspace method to estimate the time-varying space-time channel by taking into account the different rates of variation between delays/directions of arrival (slowly-varying) and faded amplitudes (fast-varying) of the multipath propagation. The stationarity of angles and delays across several time-slots is exploited to perform an unstructured estimation that avoids the explicit computation of the path parameters. Numerical analysis for a TD-CDMA system shows that the asymptotic performance is reached with a reasonable number of slots.
Keywords :
code division multiple access; delays; direction-of-arrival estimation; land mobile radio; maximum likelihood estimation; multipath channels; multiuser channels; time-varying channels; MLE; TD-CDMA systems; angle stationarity; asymptotic performance; delay stationarity; direction of arrival; faded amplitudes; fast-varying space-time channels; mobile communication systems; multipath propagation; multislot estimation; path parameters; subspace method; time-varying space-time channel estimation; unconstrained maximum-likelihood estimates; unstructured estimation; Amplitude estimation; Base stations; Channel estimation; Delay estimation; Direction of arrival estimation; Linear antenna arrays; Numerical analysis; Propagation delay; Spatial resolution; Time division synchronous code division multiple access;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2002.803476
