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Furthermore. 5. because both Rs s and En are asymptotically perfectly measured [139]. uncorrelated spatially white Gaussian noise with zero mean and unit variance (σn2 = 1) is assumed. should be sought simultaneously by maximizing an appropriate functional rather than obtaining estimates one at a time as is done in the search for spectral peaks over PMU S I C (θ ). multidimensional searches are accompanied with an intense expense compared to one-dimensional searches. the search for their DOAs.

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