IP Library › Granted Patent US 12,425,885
Granted Patent B2
US 12,425,885 · App. 18/488,919 · Granted Sep 23, 2025

Systems and methods for receiving data transmitted using non-uniform QAM 256 constellations via fading channels

Inventors: Maged F. Barsoum (San Jose, CA); Christopher R. Jones (Pacific Palisades, CA)
Assignee: Constellation Designs, LLC
H04W24/02H04L1/0003H04L1/0009H04L5/006H04L27/3405H04W72/0453H04W72/0473
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Quick Facts
Patent No.
US 12,425,885
App. No.
18/488,919
Granted
Sep 23, 2025
Kind
B2
Abstract

Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR, over the Rayleigh fading channel. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d min , are also described. Capacity measures that are used in the selection of the location of constellation points include, but are not limited to, parallel decode (PD) capacity and joint capacity.

Claims (50)

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.

2. The communication system of claim 1 , wherein the receiver is configured to select the NU-QAM 64 point symbol constellation from the plurality of NU-QAM symbol constellations in response to a message from a transmitter.

3. The communication system of claim 1 , wherein the NU-QAM 64 point symbol constellation comprises an in-phase component and a quadrature component, where each component comprises 8 levels of amplitude such that the amplitudes scaled by a scaling factor are:

−7.3497, −4.7266, −2.6089, −0.9134, 0.9134, 2.6089, 4.7266, 7.3497.

4. The communication system of claim 1 , wherein each of the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than a similar uniform QAM symbol constellation at the same SNR, where the similar uniform QAM symbol constellation differs only in that the constellation points in the similar uniform QAM symbol constellation are uniformly spaced.

5. The communication system of claim 1 , wherein each NU-QAM 64 point symbol constellation in the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than other NU-QAM 64 point symbol constellations in the plurality of NU-QAM symbol constellations at the same SNR.

6. The communication system of claim 1 , wherein the selected NU-QAM 64 point symbol constellation is capable of providing a greater parallel decoding capacity in a Rayleigh channel at an SNR of 15.0542 dB than other NU-QAM 64 point symbol constellations in the plurality of NU-QAM symbol constellations at an SNR of 15.0542 dB.

7. The communication system of claim 1 , wherein each of the plurality of NU-QAM symbol constellations is characterized by assignment of labels and spacing of constellation points so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR subject to at least one constraint.

8. The communication system of claim 1 , wherein the selected NU-QAM 64 point symbol constellation is an orthogonalized non-uniform Pulse Amplitude Modulated (NU-PAM) constellation, where the NU-PAM constellation is characterized by assignment of labels and spacing of constellation points in one dimension so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

9. The communication system of claim 1 , wherein the selected NU-QAM 64 point symbol constellation is characterized by assignment of labels and spacing of constellation points in two dimensions so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

10. The communication system of claim 1 , wherein the receiver is capable of replacing at least one existing symbol constellation with the plurality of NU-QAM symbol constellations by an upgrade to at least one of the receiver software and firmware.

11. A communication system, comprising:

a receiver that receives signals via a communication channel having a channel signal-to-noise ratio (SNR), wherein the receiver comprises:

a demodulator that demodulates a received signal into a demodulated signal;

a demapper that determines 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 that uses the 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 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.

12. The communication system of claim 11 , wherein the receiver is configured to select the NU-QAM 64 point symbol constellation from the plurality of NU-QAM symbol constellations in response to a message from a transmitter.

13. The communication system of claim 11 , wherein the NU-QAM 64 point symbol constellation comprises an in-phase component and a quadrature component, where each component comprises 8 levels of amplitude such that the amplitudes scaled by a scaling factor are:

−7.3497, −4.7266, −2.6089, −0.9134, 0.9134, 2.6089, 4.7266, 7.3497.

14. The communication system of claim 11 , wherein each of the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than a similar uniform QAM symbol constellation at the same SNR, where the similar uniform QAM symbol constellation differs only in that the constellation points in the similar uniform QAM symbol constellation are uniformly spaced.

15. The communication system of claim 11 , wherein each NU-QAM 64 point symbol constellation in the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than other NU-QAM 64 point symbol constellations in the plurality of NU-QAM symbol constellations at the same SNR.

16. The communication system of claim 11 , wherein the selected NU-QAM 64 point symbol constellation is capable of providing a greater parallel decoding capacity in a Rayleigh channel at an SNR of 15.0542 dB than other NU-QAM 64 point symbol constellations in the plurality of NU-QAM symbol constellations at an SNR of 15.0542 dB.

17. The communication system of claim 11 , wherein each of the plurality of NU-QAM symbol constellations is characterized by assignment of labels and spacing of constellation points so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR subject to at least one constraint.

18. The communication system of claim 11 , wherein the selected NU-QAM 64 point symbol constellation is an orthogonalized non-uniform Pulse Amplitude Modulated (NU-PAM) constellation, where the NU-PAM constellation is characterized by assignment of labels and spacing of constellation points in one dimension so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

19. The communication system of claim 11 , wherein the selected NU-QAM 64 point symbol constellation is characterized by assignment of labels and spacing of constellation points in two dimensions so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

20. The communication system of claim 11 , wherein the receiver is capable of replacing at least one existing symbol constellation with the plurality of NU-QAM symbol constellations by an upgrade to at least one of the receiver software and firmware.

21. A communication system, comprising:

a receiver that receives signals via a communication channel having a channel signal-to-noise ratio (SNR), wherein the receiver uses a non-uniform quadrature amplitude modulation (NU-QAM) 64 point symbol constellation selected from a plurality of NU-QAM symbol constellations to transform the received signals into 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 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.

22. The communication system of claim 21 , wherein the receiver is configured to select the NU-QAM 64 point symbol constellation from the plurality of NU-QAM symbol constellations in response to a message from a transmitter.

23. The communication system of claim 21 , wherein the NU-QAM 64 point symbol constellation comprises an in-phase component and a quadrature component, where each component comprises 8 levels of amplitude such that the amplitudes scaled by a scaling factor are:

−7.3497, −4.7266, −2.6089, −0.9134, 0.9134, 2.6089, 4.7266, 7.3497.

24. The communication system of claim 21 , wherein each of the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than a similar uniform QAM symbol constellation at the same SNR, where the similar uniform QAM symbol constellation differs only in that the constellation points in the similar uniform QAM symbol constellation are uniformly spaced.

25. The communication system of claim 21 , wherein each NU-QAM 64 point symbol constellation in the plurality of NU-QAM symbol constellations is capable of providing a greater parallel decoding capacity in a Rayleigh channel at a specific SNR than other NU-QAM 64 point symbol constellations in the plurality of NU-QAM symbol constellations at the same SNR.

26. The communication system of claim 21 , wherein the selected NU-QAM 64 point symbol constellation is capable of providing a greater parallel decoding capacity in a Rayleigh channel at an SNR of 15.0542 dB than the other NU-QAM symbol constellations in the plurality of NU-QAM 64 point symbol constellations at an SNR of 15.0542 dB.

27. The communication system of claim 21 , wherein each of the plurality of NU-QAM symbol constellations is characterized by assignment of labels and spacing of constellation points so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR subject to at least one constraint.

28. The communication system of claim 21 , wherein the selected NU-QAM 64 point symbol constellation is an orthogonalized non-uniform Pulse Amplitude Modulated (NU-PAM) constellation, where the NU-PAM constellation is characterized by assignment of labels and spacing of constellation points in one dimension so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

29. The communication system of claim 21 , wherein the selected NU-QAM 64 point symbol constellation is characterized by assignment of labels and spacing of constellation points in two dimensions so as to maximize parallel decoding capacity in a Rayleigh channel at a specific SNR.

30. The communication system of claim 21 , wherein the receiver is capable of replacing at least one existing symbol constellation with the plurality of NU-QAM symbol constellations by an upgrade to at least one of the receiver software and firmware.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 15, 2025
From: BARSOUM, MAGED F.; JONES, CHRISTOPHER R.
To: CONSTELLATION DESIGNS, INC.
Reel/Frame 072034/0193 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 15, 2025
From: CONSTELLATION DESIGNS, INC.
To: CONSTELLATION DESIGNS, LLC
Reel/Frame 072034/0335 →
Continuity (8)
Continuation 17346153 · Jun 11, 2021
Continuation 16752332 · Jan 24, 2020
Continuation 16517497 · Jul 19, 2019
Continuation 15682512 · Aug 21, 2017
Continuation 14943003 · Nov 16, 2015
Continuation 13179383 · Jul 8, 2011
Provisional Application 61362649 · Jul 8, 2010
Related Publication 20240049008A1 · Feb 8, 2024
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“Exhibit E-02: U.S. Pat. No. 8,503,550 Ko et al.”, Defendant's P.R. 3-3 Invalidity Contentions for U.S. Pat. Nos. 8,842,761; 9,743,290; 10,567,980; 10,693,700; 11,018,922; 11,019,509; 11,039,324, [cited by applicant]
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“Exhibit F-09: Bernard Sklar, Digital Communications Fundamentals and Applications”, Defendant's P.R. 3-3 Invalidity Contentions for U.S. Pat. Nos. 8,842,761; 9,743,290; 10,567,980; 10,693,700; 11,018,922; 11,019,509; 1… [cited by applicant]
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