Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Multi-band lookup table type predistorter
A lookup table type predistorter for reading out distortion compensation data by using a difference signal between a power amplifier input signal and an output signal as a reference signal; wherein N input side variable band signal extractors extract transmitting signals in N frequency bands from the input signal, N output side variable band signal extractors extract signals in N frequency bands from the output of power amplifier, and N difference detectors detect differences between N frequency band signals respectively detected at the input side and the output side as N reference signals, which are used to read out N compensation data from N lookup tables, the N compensation data are added to the transmitting signals in N frequency bands, and N results of addition are combined to produce an output of the predistorter.
NTT DoCoMo, Inc.
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inventional inventional additional
Yasunori Shoichi
Suzuki Narahashi