US 12,323,284 B2
Efficient staggered multi-tone (SMT) modulation/demodulation with time-domain phase adjustment
Brian Gunn, Farmington, UT (US)
Assigned to L3Harris Technologies, Inc., Melbourne, FL (US)
Filed by L3Harris Technologies, Inc., Melbourne, FL (US)
Filed on Sep. 20, 2023, as Appl. No. 18/370,802.
Prior Publication US 2025/0097090 A1, Mar. 20, 2025
Int. Cl. H04L 27/26 (2006.01); H04L 25/03 (2006.01)
CPC H04L 27/265 (2013.01) [H04L 25/03006 (2013.01); H04L 27/26526 (2021.01); H04L 2025/03414 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A staggered multi-tone (SMT) modulator comprising:
a Fourier transform module that is coupled to an input for receiving a complex valued data frame, the Fourier transform module configured to transform the complex valued data frame from a frequency domain into a time domain;
a symmetry extractor module configured to extract a conjugate symmetric data frame and a conjugate antisymmetric data frame from the transformed complex data frame;
a first circular shift module configured to perform a circular rotational phase shift on the conjugate symmetric data frame;
a first filter configured to filter the phase shifted conjugate symmetric data frame;
a second circular shift module configured to perform a circular rotational phase shift on the conjugate antisymmetric data frame;
a second filter configured to filter the phase shifted conjugate antisymmetric data frame; and
a summing module configured to sum the phase shifted conjugate symmetric data frame and the phase shifted conjugate antisymmetric data frame to generate a modulated data frame for an output that is coupled to the summing module.