Blind source separation based on combined direction finding and constant modulus properties

In the blind separation of instantaneous mixtures of multiple cochannel signals using an antenna array, two types of techniques have been used: that based on properties of the array manifold, or based on properties of the signals. A well-studied example of the first type is the ESPRIT algorithm, which exploits the parametric structure of the array manifold. A representative of the second type is ACMA, which gives algebraic expressions for the separation of sources based on their constant modulus property, valid for phase-modulated sources. We show that the two properties can be combined into a single algorithm.