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US 8,412,124 B2Granted
Multi-band peak power reduction
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsBradley John Morris, Neil McGowan, Sai Mohan Kilambi
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Abstract
Peak power reduction in transmit chains of multi-band radiocommunication devices is performed. By using knowledge of the phase transformations which occur at the upconverter to determine how baseband signal samples will combine at the higher (upconverted) frequency, peak prediction and corresponding baseband signal modification can be performed in a way that reduces peak power of the combined signal.
Claims28
A method for reducing peak power of a signal, comprising:
- predicting a peak associated with subsequent combination of a signal sample from each of at least two input signals;
- generating at least one scaling value using the predicted peak;
- modifying the signal sample from the at least two input signals using the at least one scaling value to generate modified input signals;
- upconverting the modified input signals to generate upconverted signals;
- and
- combining the upconverted signals thereby providing a peak power reduced signal.
3 more elements
A transmitter comprising:
- a peak prediction function configured to predict a peak associated with subsequent combination of a signal sample from at least two input signals;
- a scaling value generation function configured to generate at least one scaling value using the predicted peak;
- a signal modification function associated with each input signal and configured to modify the signal samples from the at least two input signals using the at least one scaling value to generate modified input signals;
- an upconverter function associated with each input signal and configured to upconvert the modified input signals to generate upconverted signals;
- and
- a combiner function configured to combine the upconverted signals.
3 more elements
Dependencies are inferred from the claim text.