US 11,689,942 B2
Communication systems capable of receiving and processing data using unequally spaced and uniform quadrature amplitude modulated 64 point symbol constellations
Maged F. Barsoum, San Jose, CA (US); and Christopher R. Jones, Pacific Palisades, CA (US)
Assigned to Constellation Designs, LLC, Anaheim, CA (US)
Filed by Constellation Designs, LLC, Anaheim, CA (US)
Filed on May 26, 2022, as Appl. No. 17/804,306.
Application 17/804,306 is a continuation of application No. 17/325,169, filed on May 19, 2021.
Application 17/325,169 is a continuation of application No. 16/728,397, filed on Dec. 27, 2019, granted, now 11,051,187, issued on Jun. 29, 2021.
Application 16/728,397 is a continuation of application No. 16/206,991, filed on Nov. 30, 2018, granted, now 10,567,980, issued on Feb. 18, 2020.
Application 16/206,991 is a continuation of application No. 15/682,475, filed on Aug. 21, 2017, granted, now 10,149,179, issued on Dec. 4, 2018.
Application 15/682,475 is a continuation of application No. 15/200,800, filed on Jul. 1, 2016, granted, now 9,743,292, issued on Aug. 22, 2017.
Application 15/200,800 is a continuation of application No. 14/491,731, filed on Sep. 19, 2014, granted, now 9,385,832, issued on Jul. 5, 2016.
Application 14/491,731 is a continuation of application No. 13/618,630, filed on Sep. 14, 2012, granted, now 8,842,761, issued on Sep. 23, 2014.
Application 13/618,630 is a continuation of application No. 13/118,921, filed on May 31, 2011, granted, now 8,270,511, issued on Sep. 18, 2012.
Application 13/118,921 is a continuation of application No. 12/156,989, filed on Jun. 5, 2008, granted, now 7,978,777, issued on Jul. 12, 2011.
Claims priority of provisional application 60/933,319, filed on Jun. 5, 2007.
Prior Publication US 2022/0295312 A1, Sep. 15, 2022
Int. Cl. H04W 24/02 (2009.01); H04L 1/00 (2006.01); H04L 27/34 (2006.01); H04B 17/336 (2015.01); H03M 13/25 (2006.01); H03M 13/00 (2006.01); H04L 27/38 (2006.01); H04B 15/00 (2006.01)
CPC H04W 24/02 (2013.01) [H03M 13/255 (2013.01); H03M 13/6325 (2013.01); H04B 15/00 (2013.01); H04B 17/336 (2015.01); H04L 1/0003 (2013.01); H04L 1/0009 (2013.01); H04L 27/3405 (2013.01); H04L 27/3483 (2013.01); H04L 27/3809 (2013.01)] 71 Claims
OG exemplary drawing
 
1. A communication system, comprising:
a sink device capable of receiving data bits;
a receiver capable of receiving signals via a communication channel having a channel signal-to-noise ratio (SNR) and providing data bits to the sink device, wherein the receiver comprises:
a demodulator capable of demodulating a received signal into a demodulated signal;
a demapper, coupled to the demodulator, capable of determining likelihoods using the demodulated signal and a symbol constellation selected from a set of symbol constellations comprising:
an unequally spaced Quadrature Amplitude Modulated 64 point (QAM-64) symbol constellation; and
a uniformly spaced QAM-64 signal constellation; and
a decoder, coupled to the demapper, capable of using the likelihoods determined by the demapper to provide a sequence of received bits based upon a low density parity check (LDPC) code selected from a set of LDPC codes having different code rates;
wherein use of the unequally spaced QAM-64 symbol constellation in combination with any LDPC code from the set of LDPC codes provides a greater SNR gain than is obtained when utilizing the uniformly spaced QAM-64 symbol constellation in combination with that particular LDPC code; and
wherein use of a specific LDPC code having a code rate that is greater than 1/2 from the set of LDPC codes in combination with the unequally spaced QAM-64 symbol constellation provides a larger SNR gain than the SNR gains achieved using the unequally spaced QAM-64 symbol constellation in combination with any of the other LDPC codes from the set of LDPC codes.