The RCAP: a concept for robust beamforming and high resolution DOA tracking

Motivated by the objective of finding a reduced complexity implementation of the EM (estimate and maximize) algorithm, the authors move the concept of alternating projection (AP), reported Ziskind and Wax (1988), to a specific architecture for array processing in communications. Direction of arrivals (DOAs) are estimated by scanning the scenario with a dedicated beamvector, proving that low-resolution procedures with constraints, working in parallel, may enhance the performance of high resolution methods. Since no inverse is involved the method is robust and copes with full coherent sources (specular multipath) and fast updates. The procedure proved to be useful for adaptive beamforming in either point-to-point or mobile communications. Preserving the EM performance the array processing architecture offers a wide range of possibilities in updating and framing taking the best of hardware resources.

[1]  Lloyd J. Griffiths,et al.  Quiescent pattern control in linearly constrained adaptive arrays , 1987, IEEE Trans. Acoust. Speech Signal Process..

[2]  D. Davies Independent angular steering of each zero of the directional pattern for a linear array , 1967 .

[3]  Ehud Weinstein,et al.  Parameter estimation of superimposed signals using the EM algorithm , 1988, IEEE Trans. Acoust. Speech Signal Process..

[4]  Petar M. Djuric,et al.  An iterative MMSE procedure for parameter estimation of damped sinusoidal signals , 1996, Signal Process..

[5]  Jeng-Kuang Hwang,et al.  A combined detection-estimation algorithm for the harmonic-retrieval problem , 1993, Signal Process..

[6]  Ilan Ziskind,et al.  Maximum likelihood localization of multiple sources by alternating projection , 1988, IEEE Trans. Acoust. Speech Signal Process..

[7]  M.A. Lagunas,et al.  Fuzzy logic for robust detection in wireless communications , 1997, Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97.

[8]  M.A. Lagunas,et al.  High performance DOA trackers derived from parallel low resolution detectors , 1996, Proceedings of 8th Workshop on Statistical Signal and Array Processing.

[9]  Michael I. Miller,et al.  Maximum-likelihood narrow-band direction finding and the EM algorithm , 1990, IEEE Trans. Acoust. Speech Signal Process..