Estimation of frequency-selective block-fading MIMO channels using PARAFAC modeling and alternating least squares

de Almeida, André L F;Favier, Gérard;Mota, Joao Cesar M;de Lacerda Neto, Raul Liberato

Asilomar 2006, 40th Annual Asilomar Conference on Signals, Systems and Computers, October 29-November 1, 2006, Pacific Grove, USA

The parametric estimation of Multiple-Input Multiple-Output (MIMO) channels is an important step towards the space-time characterization of the radio channel as well as for the design of efficient space-time signaling techniques. In this paper, we address the problem of multipath parameter estimation for frequency-selective block-fading MIMO channels by means of Parallel Factor (PARAFAC) analysis [1]-[2]. First, we present a fourth-order PARAFAC model for a specular MIMO radio channel, which jointly captures the space-time signature (angles of arrival, angles of departure and delays) and the time-varying fading amplitudes. Based on this model, an Alternating Least Squares (ALS) algorithm is used for estimating the multipath signals from a collection of received data blocks. After the multipath resolution stage, final estimates of the angles, delays and fading amplitudes are obtained by exploiting the knowledge of a multi-block training sequence. Numerical results are provided to illustrate the performance of this estimation approach.

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Type:

Conférence

City:

Pacific Grove

Date:

2006-10-29

Department:

Systèmes de Communication

Eurecom Ref:

2320

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