US 12,483,325 B2
Adaptive constellation for transmodulation in satellite communication systems
Liping Chen, Bethesda, MD (US); Rohit Iyer Seshadri, Gaithersburg, MD (US); Stanley Kay, Rockville, MD (US); and Lin-nan Lee, Potomac, MD (US)
Assigned to Hughes Network Systems, LLC, Germantown, MD (US)
Filed by Hughes Network Systems, LLC, Germantown, MD (US)
Filed on Apr. 28, 2023, as Appl. No. 18/140,663.
Claims priority of provisional application 63/351,300, filed on Jun. 10, 2022.
Prior Publication US 2023/0403071 A1, Dec. 14, 2023
Int. Cl. H04B 7/185 (2006.01); H04B 17/336 (2015.01); H04L 27/34 (2006.01); H04W 88/16 (2009.01)
CPC H04B 7/18526 (2013.01) [H04B 17/336 (2015.01); H04L 27/3405 (2013.01); H04W 88/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gateway for a satellite communication system, comprising:
a data input interface configured to receive (i) a first bitstream for transmission on a first forward link from a satellite to a first terminal and (ii) a second bitstream for transmission on a second forward link from the satellite to a second terminal;
a modulator configured to map data to symbols for transmission on a feeder link for transmissions from the gateway to the satellite, wherein the modulator is configured to use a same symbol constellation to modulate data for transmission on the feeder link to achieve each of multiple different numbers of bits per symbol, including by selecting symbols for transmission from among different subsets of the symbols in the symbol constellation to achieve different numbers of bits per symbol,
wherein the modulator is configured to (i) select data to map to a symbol for transmission on the feeder link, the selected data including a portion of the first bitstream and a portion of the second bitstream, and (ii) select a symbol to represent the selected data in a transmission on the feeder link, the symbol being selected from among a subset of the symbols in the symbol constellation and the subset is determined based at least in part on a measure of signal strength for the feeder link; and
a transmitter to transmit the selected symbol on the feeder link from the gateway to the satellite.