Technical Program

Paper Detail

Paper:	SPCOM-P6.6
Session:	Channel Estimation & Equalization I
Time:	Wednesday, May 17, 14:00 - 16:00
Presentation:	Poster
Topic:	Signal Processing for Communication: Channel modeling and estimation, training schemes
Title:	Multipath Parameter Estimation of Time-Varying Space-Time Communication Channels Using Parallel Factor Analysis
Authors:	André de Almeida, Gérard Favier, Laboratoire I3S / CNRS / UNSA, France; João Mota, Laboratorio GTEL / DETI / UFC, Brazil
Abstract:	In this work we propose a new method for estimation of multipath parameters in the context of mobile communications. The proposed method is an effective way to exploit the fact that the paths amplitudes are fast-varying while angles and delays are slowly-varying over multiple time-slots. By relying on such a multislot invariance of angles and delays and by periodically extending a training sequence over multiple time-slots, we show that the received signal can be modeled as a third-order (3D) tensor, which follows a Parallel Factor (PARAFAC) model. An accelerated alternating least squares (ALS) algorithm is used for a joint estimation of the angles of arrival, delays and fading amplitudes of the multipaths. Numerical results from computer simulations show that the proposed PARAFAC-based estimator is capable of estimating the multipath channel parameters with good accuracy using short training sequences and with fewer receiver antennas than multipaths.