US 12,425,885 B2
Systems and methods for receiving data transmitted using non-uniform QAM 256 constellations via fading channels
Maged F. Barsoum, San Jose, CA (US); and Christopher R. Jones, Pacific Palisades, CA (US)
Assigned to Constellation Designs, LLC, Wayne, PA (US)
Filed by Constellation Designs, LLC, Wayne, PA (US)
Filed on Oct. 17, 2023, as Appl. No. 18/488,919.
Application 18/488,919 is a continuation of application No. 17/346,153, filed on Jun. 11, 2021.
Application 17/346,153 is a continuation of application No. 16/752,332, filed on Jan. 24, 2020, granted, now 11,039,324, issued on Jun. 15, 2021.
Application 16/752,332 is a continuation of application No. 16/517,497, filed on Jul. 19, 2019, granted, now 10,548,031, issued on Jan. 28, 2020.
Application 16/517,497 is a continuation of application No. 15/682,512, filed on Aug. 21, 2017, granted, now 10,524,139, issued on Dec. 31, 2019.
Application 15/682,512 is a continuation of application No. 14/943,003, filed on Nov. 16, 2015, granted, now 9,743,290, issued on Aug. 22, 2017.
Application 14/943,003 is a continuation of application No. 13/179,383, filed on Jul. 8, 2011, granted, now 9,191,148, issued on Nov. 17, 2015.
Claims priority of provisional application 61/362,649, filed on Jul. 8, 2010.
Prior Publication US 2024/0049008 A1, Feb. 8, 2024
Int. Cl. H04W 24/02 (2009.01); H04L 1/00 (2006.01); H04L 5/00 (2006.01); H04L 27/34 (2006.01); H04W 72/044 (2023.01); H04W 72/0453 (2023.01)
CPC H04W 24/02 (2013.01) [H04L 1/0003 (2013.01); H04L 1/0009 (2013.01); H04L 5/006 (2013.01); H04L 27/3405 (2013.01); H04W 72/0453 (2013.01); H04W 72/0473 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A communication system, comprising:
a receiver capable of receiving signals via a communication channel having a channel signal-to-noise ratio (SNR), comprising:
a demodulator capable of demodulating a received signal into a demodulated signal;
a demapper, coupled to the demodulator, capable of determining likelihoods using a non-uniform quadrature amplitude modulation (NU-QAM) 64 point symbol constellation selected from a plurality of NU-QAM symbol constellations; and
a decoder, coupled to the demapper, capable of using likelihoods determined by the demapper to provide a sequence of received bits based upon a low density parity check (LDPC) code having a code rate at or below 2/3;
wherein the selected NU-QAM 64 point symbol constellation is characterized in that the selected NU-QAM 64 point symbol constellation provides a parallel decoding capacity in a Rayleigh channel that is greater than or equal to 4 bits per symbol at an SNR that it is at or below 15.0542 dB;
wherein the selected NU-QAM 64 point symbol constellation is further characterized in that the selected NU-QAM 64 point symbol constellation provides a parallel decoding capacity in a Rayleigh channel that is greater than the parallel decoding capacity in a Rayleigh channel of a uniformly spaced QAM 64 point symbol constellation at SNRs between 15.0542 dB and 19.2 dB; and
wherein the receiver is configured to use the selected NU-QAM 64 point symbol constellation to receive data when the channel SNR is an SNR that is at or below 19.2 dB and that is above 15.0542 dB.