A dictionary at least partially spans a set of discrete q-length signals. The atoms of the dictionary are eigenvectors of a representation of a commutative subgroup of a finite symplectic group. The dictionary may be used for interpreting a radar signal, denoising a signal, compressing data, finding a sparse representation, deblurring at a signal finding a sparse representation of a signal, encoding a signal for communication, encoding a symbol for CDMF communication, classifying a data set and generating a random number.
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