Cascaded Digital Cancelers.
DEPARTMENT OF THE NAVY WASHINGTON DC
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The invention is a configuration of digital open-loop cancelers, each of which uses a batch window sampling technique, for decorrelating a main input signal from a plurality of auxiliary input signals by using one or more iterations of cancellation. The main signal includes a desirable signal and undesirable interference signals. The auxiliary signals include the undesirable interference signals which are correlated with the interference of the main signal. Samples of the main signal and a first auxiliary signal are fed to a first digital canceler. The canceler batches them, forms the samples in a group and measures the correlation between the main signal and auxiliary signal. This measurement, or weight, is applied to each of the samples of the auxiliary signal which were used to establish the weight. The weighted auxiliary samples are subtracted from the main input signal to produce an output residue signal that is uncorrelated with the auxiliary signal. The residue signal is fed to a second canceler which operates in the same manner as the first canceler. A second auxiliary signal is also fed to the second canceler but is delayed by the processing time of the first canceler. Author
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