US 12,137,012 B2
Constant envelope bi-phase shift keying (CE-BPSK) modulation for “mode S” and other communication applications
Macdonald J. Andrews, Douglas, MA (US)
Assigned to Raytheon Company, Tewksbury, MA (US)
Filed by Raytheon Company, Waltham, MA (US)
Filed on Jul. 13, 2022, as Appl. No. 17/812,403.
Application 17/812,403 is a continuation of application No. 17/306,648, filed on May 3, 2021, granted, now 11,411,786.
Prior Publication US 2022/0376962 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 27/20 (2006.01)
CPC H04L 27/20 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining an in-phase (I) input signal and a quadrature (Q) input signal at a quadrature modulator; and
performing constant envelope bi-phase shift keying (CE-BPSK) modulation using the quadrature modulator to generate a modulated output signal;
wherein the modulated output signal comprises a CE-BPSK modulated waveform containing phase reversals, the CE-BPSK modulated waveform having a substantially-constant amplitude during the phase reversals; and
wherein the quadrature modulator causes the modulated output signal to step through a number of phases during each phase reversal while maintaining the substantially-constant amplitude.