US 12,328,219 B2
Systems and methods for supporting both pulse amplitude modulation and quadrature amplitude modulation
Masashi Shimanouchi, San Jose, CA (US); Hsinho Wu, Santa Clara, CA (US); and Peng Li, Palo Alto, CA (US)
Assigned to Altera Corporation, San Jose, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Jun. 25, 2021, as Appl. No. 17/358,982.
Prior Publication US 2021/0328852 A1, Oct. 21, 2021
Int. Cl. H04L 27/36 (2006.01); H04L 27/38 (2006.01)
CPC H04L 27/36 (2013.01) [H04L 27/38 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An electronic device comprising:
encoding circuitry to map data from an input bit stream to IQ data comprising an in-phase component and a quadrature-phase component;
modulator circuitry to determine an in-phase pulse amplitude modulation signal based on the in-phase component and a quadrature-phase pulse amplitude modulation signal based on the quadrature-phase component, wherein the in-phase pulse amplitude modulation signal is different by 90° from the quadrature-phase pulse amplitude modulation signal, wherein the modulator circuitry uses a carrier frequency less than or equal to a symbol rate of the IQ data; and
driver circuitry to transmit the in-phase pulse amplitude modulation signal and the quadrature-phase pulse amplitude modulation signal across a wireline channel, wherein the in-phase pulse amplitude modulation signal is different by 90° from the quadrature-phase pulse amplitude modulation signal to enable a remote receiver on the wireline channel to detect the in-phase pulse amplitude modulation signal independently of the quadrature-phase pulse amplitude modulation signal.