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A technique for binary data transmission is described, in which each binary symbol is chosen to be a prescribed superposition of impulses of form , spaced at intervals 1/2F. Such superposition leads to more than two received levels with binary input, but in return permits realization of the Nyquist rate (2F symbols/s in bandwidth ). Appropriate choice of the superposition coefficients provides a variety of spectral distributions to suit individual applications. The most interesting classes of system functions are defined, the associated coding procedures are described, and the performance characteristics are summarized.