US 12,003,350 B1
Configurable orthogonal frequency division multiplexing (OFDM) signal and transmitter and receiver for user terminal to satellite uplink communications
Martin S. McCormick, El Segundo, CA (US); Torbjorn Larsson, Escondido, CA (US); Alazar Tamrat, Torrance, CA (US); Jeffrey C. Strait, Reno, NV (US); Chen Chen, Irvine, CA (US); Philip J. Treigherman, Fountain Valley, CA (US); Stephan O. Roche, Rancho Palos Verdes, CA (US); and Ronald Gottula, San Mateo, CA (US)
Assigned to Space Exploration Technologies Corp., Hawthorne, CA (US)
Filed by Space Exploration Technologies Corp., Hawthorne, CA (US)
Filed on Feb. 26, 2021, as Appl. No. 17/186,657.
Claims priority of provisional application 62/983,644, filed on Feb. 29, 2020.
Claims priority of provisional application 62/983,649, filed on Feb. 29, 2020.
Claims priority of provisional application 62/983,641, filed on Feb. 29, 2020.
Claims priority of provisional application 62/983,651, filed on Feb. 29, 2020.
Int. Cl. H04L 25/02 (2006.01); H04B 7/185 (2006.01); H04L 5/00 (2006.01); H04W 72/044 (2023.01)
CPC H04L 25/0202 (2013.01) [H04B 7/1851 (2013.01); H04L 5/0048 (2013.01); H04W 72/044 (2013.01)] 38 Claims
OG exemplary drawing
 
1. A modem configured to transmit a waveform from a user terminal (UT) to a satellite (SAT), the modem comprising:
a transmitter, on the UT, configured to generate a transmission waveform directed to the SAT, the transmission waveform comprising:
a unique word configured in a first time period of a burst in a radio frame;
a channel estimation symbol configured in a second time period of the burst of the radio frame;
a first pilot subcarrier at a first frequency in a third time period of the burst in the radio frame;
a second pilot subcarrier at a second frequency in the third time period of the burst in the radio frame; and
a first pilot sub-band offset configured in the third time period and at a third frequency and a second pilot sub-band offset configured in the third time period and at a fourth frequency, wherein the third frequency of the first pilot sub-band offset is at a high frequency edge of a frequency band of the radio frame and the fourth frequency of the second pilot sub-band offset is at a low frequency edge of the frequency band of the radio frame;
a resource block comprising user data configured in the third time period and utilizing a set of frequency resources between the first pilot subcarrier and the second pilot subcarrier; and
a DC null configured in the third time period.