Patent ID: 8934556
Filing Date: 2015-01-13
Classification: H04L

Abstract:
1. A system for communicating using shaped cyclic time-domain waveforms comprising a cyclic modulator having one or more processing elements arranged to: perform a first transform on an input symbol vector to generate a transformed input vector in a frequency domain; extend the transformed input symbol vector in the frequency domain to generate an expanded symbol vector; weight, in the frequency domain, at least some elements of the expanded symbol vector with a weighting vector selected for Nyquist-pulse shaping to generate a weighted symbol vector; and perform a second transform on the weighted symbol vector to generate an output symbol vector for subsequent processing and transmission, the output symbol vector comprising a time-domain symbol vector, wherein the second transform is an inverse of the first transform and the second transform comprises a greater number of points than the first transform, and wherein extending the transformed input symbol vector in the frequency domain creates an extended frequency domain aperture to allow weighting of additional elements of the expanded symbol vector to allow the time-domain symbol vector to become a Nyquist-filtered waveform with a low peak-to-average power ratio (PAPR).