20240048432. DCM-COFDM Signaling Using Square NU-QAM Symbol Constellations with Labeling Diversity simplified abstract (Unknown Organization)
DCM-COFDM Signaling Using Square NU-QAM Symbol Constellations with Labeling Diversity
Organization Name
Inventor(s)
Allen LeRoy Limberg of Port Charlotte FL (US)
DCM-COFDM Signaling Using Square NU-QAM Symbol Constellations with Labeling Diversity - A simplified explanation of the abstract
This abstract first appeared for US patent application 20240048432 titled 'DCM-COFDM Signaling Using Square NU-QAM Symbol Constellations with Labeling Diversity
Simplified Explanation
The abstract describes a patent application related to the use of Superposition Coding Modulation (SCM) in a Coded Orthogonal Frequency-Division Multiplexed (COFDM) signal. The SCM technique utilizes Non-Uniform Quadrature Amplitude Modulation (NU-QAM) to reduce the peak-to-average-power ratio (PAPR) of the signal. This is achieved by employing labeling diversity, where the number of lattice points in the NU-QAM symbol constellations is squared to compensate for the halving of data throughput caused by Dual-Carrier Modulation (DCM).
- The patent application focuses on the use of SCM in a COFDM signal.
- It introduces the concept of NU-QAM for reducing PAPR.
- Labeling diversity is employed to increase the number of lattice points in NU-QAM symbol constellations.
- The non-uniform spacing of lattice points in NU-QAM reduces the likelihood of error caused by additive-white-Gaussian-noise (AWGN).
- Bits of NU-QAM symbol constellations more likely to be in error due to AWGN in the lattice-point labels (LPLs) of one DCM signal correspond to bits less likely to be in error in the LPLs of the other DCM signal.
Potential Applications:
- Wireless communication systems
- Digital broadcasting
- Satellite communication
- Mobile communication
Problems Solved:
- High peak-to-average-power ratio (PAPR) in COFDM signals
- Reduction of data throughput due to dual-carrier modulation (DCM)
- Error caused by additive-white-Gaussian-noise (AWGN) in symbol constellations
Benefits:
- Reduced PAPR in COFDM signals
- Increased data throughput by compensating for DCM
- Improved error performance in symbol constellations due to non-uniform spacing of lattice points
Original Abstract Submitted
the superposition coding modulation (scm) of dual-carrier modulation (dcm) in a coded orthogonal frequency-division multiplexed (cofdm) signal using non-uniform quadrature amplitude modulation (nu-qam) of its carrier waves employs labeling diversity to reduce its peak-to-average-power ratio (papr). the number of lattice points in the square nu-qam symbol constellations is squared to compensate against the halving of data throughput attributable to dcm. bits of square nu-qam symbol constellations more likely to be in error owing to additive-white-gaussian-noise (awgn) in the lattice-point labels (lpls) of each of the dcm signals correspond to bits less likely to be in error owing to awgn in the lpls of the other of the dcm signals. the non-uniform spacing of lattice points in the square nu-qam symbol constellations reduces the likelihood of error in the bits least likely to be in error caused by awgn.
