IP Library › Granted Patent US 10,362,497

Granted Patent B2

US 10,362,497 · App. 15/682,512 · Granted Jul 23, 2019

Methods and apparatuses for signaling with geometric constellations in a raleigh fading channel

Inventors: Maged F. Barsoum (San Jose, CA); Christopher R. Jones (Pacific Palisades, CA)

Assignee: Constellation Designs, LLC

H04W24/02 H04L1/0003 H04L1/0009 H04L5/006 H04L27/3405 H04W72/0453 H04W72/0473

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Quick Facts

Patent No.: US 10,362,497
App. No.: 15/682,512
Granted: Jul 23, 2019
Kind: B2

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USPTO Patent Center↗ Full Patent PDF↗

Abstract

Communication systems are described that use signal constellations which have unequally spaced (i.e. “geometrically spaced,” or “non-uniform”) points. In many embodiments, the transmitters and receivers use specific non-uniform quadrature amplitude modulation (NU-QAM) constellations. In a variety of embodiments, NU-QAM constellations are capacity optimized using a bit-interleaved coded modulation (BICM, also referred to as “parallel decode”) capacity measure. In a number of embodiments, the transmitters and receivers are described that use specific NU-QAM constellations that provide gains in BICM capacity relative to constellations that maximize the minimum distance between constellation points.

Claims (54)

1. A digital communication system, comprising:

a transmitter configured to transmit signals to a receiver via a communication channel;

wherein the transmitter comprises:

a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate;

a mapper configured to map encoded bits to symbols in a non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024);

a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper;

wherein the receiver comprises:

a demodulator configured to demodulate a signal received via the communication channel based upon the NU-QAM 1024 to produce a bit stream; and

a decoder configured to decode the bit stream and output a sequence of received bits;

wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 1.5960 from the following set of amplitudes: −37.9896, −30.4644, −25.8467, −26.1314, −17.8829, −18.1165, −18.8919, −18.8919, −4.8867, −4.9004, −4.9384, −4.9384, −8.2966, −8.2966, −8.2966, −8.2966, 37.9896, 30.4644, 25.8467, 26.1314, 17.884, 18.1156, 18.8918, 18.8918, 4.8863, 4.9008, 4.9384, 4.9384, 8.2966, 8.2966, 8.2966, 8.2966.

2. The digital communication system of claim 1 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 0.6870 from the following set of amplitudes:

−37.9896, −30.4644, −25.8467, −26.1314, −17.8829, −18.1165, −18.8919, −18.8919, −4.8867, −4.9004, −4.9384, −4.9384, −8.2966, −8.2966, −8.2966, −8.2966, 37.9896, 30.4644, 25.8467, 26.1314, 17.884, 18.1156, 18.8918, 18.8918, 4.8863, 4.9008, 4.9384, 4.9384, 8.2966, 8.2966, 8.2966, 8.2966.

3. The digital communication system of claim 1 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are:

4. The digital communication system of claim 1 , wherein the receiver is configured to select the NU-QAM 1024 constellation from a plurality of constellations including a plurality of NU-QAM 1024 constellations.

5. The digital communication system of claim 1 , wherein the receiver is configured to select a code rate and the NU-QAM 1024 constellation from a plurality of combinations of code rates and NU-QAM 1024 constellations.

6. The digital communication system of claim 1 , wherein:

the coder is configured to encode bits using a low-density parity check (LDPC) code; and

the decoder is configured to decode bits using the LDPC code.

7. The digital communication system of claim 1 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using gray labels.

8. The digital communication system of claim 7 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using binary reflective gray labels.

9. A digital communication system, comprising:

a transmitter configured to transmit signals via a communication channel;

wherein the transmitter comprises:

a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate;

a mapper configured to map encoded bits to symbols in a non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024);

a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper;

wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude for which a scaling factor k exists such that the scaled amplitudes are within 1.5960 from the following set of amplitudes:

10. The digital communication system of claim 9 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 0.6870 from the following set of amplitudes:

11. The digital communication system of claim 9 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are:

12. The digital communication system of claim 9 , wherein the modulator is configured to select the NU-QAM 1024 constellation from a plurality of constellations including a plurality of NU-QAM 1024 constellations.

13. The digital communication system of claim 9 , wherein the modulator is configured to select a code rate and the NU-QAM 1024 constellation from a plurality of combinations of code rates and NU-QAM 1024 constellations.

14. The digital communication system of claim 9 , wherein the coder is configured to encode bits using a low-density parity check-code (LDPC).

15. The digital communication system of claim 9 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using gray labels.

16. The digital communication system of claim 15 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using binary reflective gray labels.

17. A digital communication system, comprising:

a receiver configured to receive signals via a communication channel;

wherein the receiver comprises:

a demodulator configured to demodulate a signal received via the communication channel based upon a NU-QAM 1024 to produce a bit stream; and

a decoder configured to decode the bit stream and output a sequence of received bits; and

18. The digital communication system of claim 17 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 0.6870 from the following set of amplitudes:

19. The digital communication system of claim 17 , wherein each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are:

20. The digital communication system of claim 17 , wherein the demodulator is configured to select the NU-QAM 1024 constellation from a plurality of constellations including a plurality of NU-QAM 1024 constellations.

21. The digital communication system of claim 17 , wherein the demodulator is configured to select a code rate and the NU-QAM 1024 constellation from a plurality of combinations of code rates and NU-QAM 1024 constellations.

22. The digital communication system of claim 17 , wherein the decoder is configured to decode bits using a low-density parity check-code (LDPC).

23. The digital communication system of claim 17 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using gray labels.

24. The digital communication system of claim 23 , wherein the symbols in the non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM 1024) are labelled using binary reflective gray labels.

Assignments (2)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 12, 2019

From: CONSTELLATION DESIGNS, INC.

To: CONSTELLATION DESIGNS, LLC

Reel/Frame 050986/0586 →

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 23, 2018

From: BARSOUM, MAGED F.; JONES, CHRISTOPHER R.

To: CONSTELLATION DESIGNS, INC.

Reel/Frame 044706/0408 →

Continuity (6)

Continuation 14943003 · Nov 16, 2015

Continuation 13179383 · Jul 8, 2011

Continuation In Part 12156989 · Jun 5, 2008

Provisional Application 60933319 · Jun 5, 2007

Provisional Application 61362649 · Jul 8, 2010

Related Publication 20170374565A1 · Dec 28, 2017