US 2020/0028725 A1Published application

COFDM DCM Signaling that EmploysLabeling Diversity to Minimize PAPR

OwnerAllen Le Roy Limberginventor

Life of this patent

Estimating the term…

Abstract

Transmitting apparatus and receiving apparatus for communication systems use coded orthogonal frequency-division multiplexed (COFDM) dual-subcarrier-modulation (DCM) signals. The same coded data is mapped both to COFDM subcarriers located in the lower-frequency half spectrum of the DCM signal and to COFDM subcarriers located in its upper-frequency half spectrum. Symbol constellation mappings of COFDM subcarriers in those half spectra preferably employ labeling diversity providing peak-to-average power ratio (PAPR) of the COFDM DCM signals substantially reduced from PAPR of double-sideband COFDM signals.

Claims25

Dependent claims

A method of employing coded orthogonal frequency-division multiplexed (COFDM) dual-subcarrier-modulation (DCM) in a communication system, in which a lower-frequency sideband and an upper-frequency sideband of a COFDM DCM signal convey the same coded digital data in respective formats designed to minimize the peak-to-average-power ratio (PAPR) of said COFDM DCM signal, said method comprising successive steps of:

parsing said coded digital data into a succession of digital map labels of a prescribed size;
generating a first set of successive coded complex-modulation (CCM) symbols in accordance with a first pattern of mapping said succession of said digital map labels to CCM symbol constellations of a chosen type, said chosen type being one of various quadrature amplitude modulation (QAM) and amplitude-phase-shift keying (APSK) types, said first pattern of mapping digital map labels to CCM symbol constellations having a respective −I,+Q quadrant and a respective +I,+Q quadrant and a respective +I,−Q quadrant and a respective I,−Q quadrant;
generating a second set of successive coded complex-modulation (CCM) symbols in accordance with a second pattern of mapping said succession of said digital map labels to CCM symbol constellations of said chosen type, said second pattern of mapping having a respective −I,+Q quadrant including the same digital map labels as the +I,−Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective +I,+Q quadrant including the same digital map labels as the −I,−Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective +I,−Q quadrant including the same digital map labels as the −I,+Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective a −I,−Q quadrant including the same digital map labels as the +I,+Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant;
employing inverse Fourier transform technique to generate coded complex modulation of a first set of subcarriers for inclusion in said lower-frequency sideband of said COFDM DCM signal, thus to convey said second succession of said digital map labels via said first set of successive CCM symbol constellations which employ said first pattern of mapping digital map labels;
employing inverse Fourier transform technique to generate coded complex modulation of a second set of subcarriers for inclusion in said upper-frequency sideband of said COFDM DCM signal, thus to convey said second succession of said digital map labels via said second set of successive CCM symbol constellations which employ said second pattern of mapping digital map labels;
up-converting said COFDM DCM signal to higher frequencies;
amplifying the power of the resulting higher-frequency COFDM DCM signal;
and
transmitting said resulting higher-frequency COFDM DCM signal via a transmission medium.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/217,120Filed 12 Dec 2018
Priority: 17 Jul 2018
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04L 27/28
Systems using multi-frequency codes: with simultaneous transmission of different frequencies each representing one code element
H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 25/067
DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection: providing soft decisions, i.e.…
H04L 27/18
Modulated-carrier systems: phase-modulated carrier systems, i.e. using phase-shift keying

Family

Application16/037,747Continuation in part · filed 17 Jul 2018
Application16/039,259Continuation in part · filed 18 Jul 2018
Application16/217,120Continuation in part
US 10,594,537 B2Related patent
US 10,601,624 B2Related patent
US 2019/0007255 A1Published application
US 2019/0132171 A1Published application
US 2020/0028725 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

patentgrep

Loading patent…

Abstract

parsing said coded digital data into a succession of digital map labels of a prescribed size;
generating a first set of successive coded complex-modulation (CCM) symbols in accordance with a first pattern of mapping said succession of said digital map labels to CCM symbol constellations of a chosen type, said chosen type being one of various quadrature amplitude modulation (QAM) and amplitude-phase-shift keying (APSK) types, said first pattern of mapping digital map labels to CCM symbol constellations having a respective −I,+Q quadrant and a respective +I,+Q quadrant and a respective +I,−Q quadrant and a respective I,−Q quadrant;
generating a second set of successive coded complex-modulation (CCM) symbols in accordance with a second pattern of mapping said succession of said digital map labels to CCM symbol constellations of said chosen type, said second pattern of mapping having a respective −I,+Q quadrant including the same digital map labels as the +I,−Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective +I,+Q quadrant including the same digital map labels as the −I,−Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective +I,−Q quadrant including the same digital map labels as the −I,+Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant, said second pattern of mapping having a respective a −I,−Q quadrant including the same digital map labels as the +I,+Q quadrant of said first pattern of mapping with the map labels associated with higher than average energy in each of these two quadrants being associated with lower than average energy in the other quadrant;
employing inverse Fourier transform technique to generate coded complex modulation of a first set of subcarriers for inclusion in said lower-frequency sideband of said COFDM DCM signal, thus to convey said second succession of said digital map labels via said first set of successive CCM symbol constellations which employ said first pattern of mapping digital map labels;
employing inverse Fourier transform technique to generate coded complex modulation of a second set of subcarriers for inclusion in said upper-frequency sideband of said COFDM DCM signal, thus to convey said second succession of said digital map labels via said second set of successive CCM symbol constellations which employ said second pattern of mapping digital map labels;
up-converting said COFDM DCM signal to higher frequencies;
amplifying the power of the resulting higher-frequency COFDM DCM signal;
and
transmitting said resulting higher-frequency COFDM DCM signal via a transmission medium.

6 more elements

Facts

Application

16/217,120Filed 12 Dec 2018

Priority

17 Jul 2018

Published

23 Jan 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04L 27/28
Systems using multi-frequency codes: with simultaneous transmission of different frequencies each representing one code element
H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 25/067
DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection: providing soft decisions, i.e.…
H04L 27/18
Modulated-carrier systems: phase-modulated carrier systems, i.e. using phase-shift keying

Family

Application16/037,747Continuation in part · filed 17 Jul 2018

Application16/039,259Continuation in part · filed 18 Jul 2018

Application16/217,120Continuation in part

US 10,594,537 B2Related patent

US 10,601,624 B2Related patent

US 2019/0007255 A1Published application

US 2019/0132171 A1Published application

US 2020/0028725 A1This patent

From the US filing history. Foreign family members aren’t listed.