Apparatus For Demodulating Dual-Mapped QAM Signals With Labeling Diversity To Benefit Bit-Reliability Averaging

Labeling diversity of the superposition coding modulation (SCM) of dual-carrier modulation (DCM) of a coded orthogonal frequency-division multiplexed (COFDM) signal is used to reduce its peak-to-average-power ratio (PAPR). The reduction of data throughput owing to DCM is compensated for by quadrupli...

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Bibliographic Details
Main Author Limberg, Allen LeRoy
Format Patent
LanguageEnglish
Published 10.12.2020
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:Labeling diversity of the superposition coding modulation (SCM) of dual-carrier modulation (DCM) of a coded orthogonal frequency-division multiplexed (COFDM) signal is used to reduce its peak-to-average-power ratio (PAPR). The reduction of data throughput owing to DCM is compensated for by quadrupling the number of lattice points in SCM mappings of the quadrature amplitude modulation (QAM) of the carriers of the COFDM signal. In a receiver for the DCM COFDM signal first and second QAM demappers demap successively considered pairs of quadrature-amplitude-modulated carriers. The demapping results from the first and second QAM demappers are diversity combined using bit-reliability averaging. The diversity combining recovers coded digital data that is subsequently decoded.
Bibliography:Application Number: US202016900907