A6stract--Forward/backward (FB) averaging is employed when possible in sensor array processing t o improve parameter estimation accuracy by exploiting a centro-aymmetry of the signal subspace. While FB averaging effectively doubles the number of data samples, it also introduces inter-sample correlation. This correlation complicates not only the performance analysis, but the detection of the number of sources as well. When FB averaging is employed, existing detection procedures such as sequential hypothesis (SH) (or likelihood ratio) tests, MDL, and AIC need t o be modified as is described herein.
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