Adaptive separation of sources and estimation of their directions of arrival

We consider array processing when the multiple sources are statistically independent narrowband signals, as in CDMA radio communications with a multisensor receiver. For a uniform linear array, a simple source separation-based criterion is proposed which jointly recovers each source on one output channel. The corresponding system has two stages whose respective parameters are the estimates of the source directions of arrival (DOA) and certain gains which constrain the output powers. The criterion involves a coupling parameter a so that all outputs recover different sources. When all the sources have negative kurtosis, the criterion minima correspond to perfect estimation of the DOA. Adaptive implementation is possible at a very low computational price. After initialization, the coupling parameter a can be cancelled, which greatly simplifies implementation. These results have been confirmed through many computer simulations.