Patent ID: 8170140
Filing Date: 2012-05-01
Classification: H04L

Abstract:
1. An active-set PAR reduction method comprises: initializing the active set to contain only the location of a maximum magnitude sample of the signal to be PAR reduced; finding all samples whose magnitude are above a predetermined magnitude level that is lower than a desired peak level and whose location are not in the active set, and store their locations into a test set; calculating the excess values that the magnitudes of the samples whose locations are in the active set overrun the desired peak level; using the excess values and the matrix composed by the samples of circularly shifted kernels to resolve a balance vector by which the circularly shifted kernels are weighted to make the magnitudes of the peak cancelled samples at the locations in the active set equal to the desired peak level; generating samples of an un-scaled peak canceling signal at the locations in the test set with the balance vector and the samples of the circularly shifted kernels; calculating a minimum scalar for each location in the test set, which scales the peak canceling signal and makes the sample of the peak canceled signal at this location have the maximum magnitude of the peak canceled signal at the locations in the active set; finding the minimum value between these scalars and one as the balance scalar; and moving the location associated with the minimum value from the test set to the active set.