Nail Cadalli and Orhan Arikan
 
A tree structured expectation maximization (EM) algorithm is proposed and applied to the wide-band angle of arrival estimation. It may be seen as a generalization on EM using the ideas of cascade EM algorithm and space alternating generalized EM algorithm. Also, for passive data acquisition, robust and efficient alternatives for the estimation of the source signals are investigated.

Index Terms: direction-of-arrival estimation; array signal processing; maximum likelihood estimation; tree data structures; data acquisition; tree structured expectation maximization algorithm; wideband maximum likelihood direction finding; angle of arrival estimation; cascade EM algorithm; space alternating generalized EM algorithm; passive data acquisition; source signals estimation; sensor array; DOA estimation

Proc. 8th IEEE    International Workshop on Statistical Signal and Array Processing, Corfu, Greece, , June 24-26, 1996,  pp. 554--557.