It is shown on the basis of theoretical and simulation results that the specific structure of the focusing matrix may have profound consequences in the statistical characteristics of the direction-of-arrival estimates. First, the focusing array signal-to-noise ratio (ASNR) loss and relative sufficiency measure are defined. Both can serve as performance measures for choosing a good focusing matrix. Next, factors that lead to the degradation of performance for the coherent-signal-subspace method based on the focusing matrices are identified. A new focusing matrix that is useful for general multigroup situations is introduced to provide a possible remedy. Various classes of focusing matrices are compared from the points of view of relative sufficiency of the reduced data and estimator/detector performance.
|Original language||English (US)|
|Number of pages||4|
|Journal||ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings|
|State||Published - Jan 1 1988|