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One of the main goals of Time-Frequency (TF) signal representations in non-stationary array processing is to equip multi-antenna receivers with the ability to separate sources in the TF domain prior to direction finding. This permits high-resolution Direction-Of-Arrival (DOA) estimation of individual sources and of more sources than sensors. In this paper, the authors use linear decomposition of sensor data based on Matching Pursuit (MP). The leading atoms of the MP, which capture most of the source TF signatures, can be different for different sources and, as such, provide the desired source discrimination.
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