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Second-order DOA estimation from digitally modulated signals

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2 Author(s)
Villares, J. ; Dept. of Signal Theor. & Commun., Tech. Univ. of Catalunya, Barcelona, Spain ; Vazquez, G.

The paper deals with the problem of estimating the direction-of-arrival (DOA) of multiple digitally-modulated sources. This problem arises naturally when studying positioning applications in the context of cellular systems. The formulation of the optimal second-order tracker is found to depend on the transmitted symbols distribution for medium-to-high signal-to-noise ratios (SNR). Simulations show that the common Gaussian assumption yields significant losses for moderate SNRs if the sources impinge from similar angles and/or the aperture is short. In these circumstances the multiuser interference (MUI) plays a prominent role and MUI-resistant techniques are evaluated.

Published in:

Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on  (Volume:2 )

Date of Conference:

9-12 Nov. 2003