Intersil Americas Inc.

Daniel Davidson MacFarlane Shearer, Iii

Ronald Duane McCallister

James A Sills

A communication system () includes a hub radio () that wirelessly communicates with any number of user radios (). The hub radio () monitors signal quality measurements compiled from the communication signals (') transmitted from the various user radios () and based upon baseband quadrature constellation point error to estimate out-of-band signal energy for the communication signals (). The hub radio () formulates commands based upon these measurements that instruct the user radios () how to adjust their power amplifier linearizers () so that their power amplifiers () become better linearized to minimize spectral regrowth and insure compliance with a spectral template.

Remote power amplifier linearization

A constrained-envelope digital communications transmitter () places constraints on the envelope of spectrally constrained, digitally modulated communication signals () converted into diverse frequency channels () and combined into a composite signal (). The envelope constraints achieve lower peak-to-average power ratio without allowing significant spectral regrowth. The composite signal () is applied to a plurality of cascade-coupled constrained-envelope generators (). Each constrained-envelope generator () detects overpeak events () and configures corrective impulses () for the overpeak events (). The corrective impulses () are distributed to the respective frequency channels () in accordance with a predetermined distribution profile () and are filtered into allocated shaped pulses () that exhibit a constrained spectrum. The allocated shaped pulses () are coherently converted into the respective frequency channels () and combined with the composite signal () to reduce an unwanted signal peak.

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Scottsdale, AZ, United States of America

Daniel Davidson MacFarlane Shearer, Iii