Block-Based Crest Factor Reduction for Peak Regrowth Control

The patent divides the continuous signal stream into discrete blocks of samples. Each block is processed independently as a unit, allowing overhead operations (peak detection, pulse generation, cancellation) to be performed once per block rather than once per sample. This segmentation maintains accurate peak cancellation within each block while dramatically reducing the frequency of overhead execution, thereby resolving the contradiction between processing accuracy and efficiency.

The patent performs preliminary peak detection and pulse cancellation operations on blocks of data before the blocks are transmitted or further processed. By detecting peaks and applying cancellation pulses within each block beforehand, the system prepares the signal to minimize regrowth effects. This preliminary action within blocks, combined with proper block sizing and overlapping, maintains signal continuity while achieving the efficiency benefits of block-based processing.

The patent implements iterative Crest Factor Reduction where the output of one iteration becomes the input for the next. Each iteration detects remaining peaks that may have regrown after previous cancellation operations and applies additional cancellation pulses. This feedback loop continues for a specified number of iterations or until convergence, effectively addressing peak regrowth and improving PAR reduction effectiveness while managing complexity through controlled iteration counts.