Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2011-08-09
2011-08-09
Choe, Henry K (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C375S297000
Reexamination Certificate
active
07994856
ABSTRACT:
This invention relates to a predistorter, a predistortion method, and a predistortion system. The predistorter comprises a modulus value determining section, for determining a modulus value of an input signal; a base searching section, for searching a predetermined base lookup table in accordance with the modulus value of the input signal, so as to obtain a base lookup table value; an offset searching section, for searching a predetermined offset lookup table in accordance with the modulus value of the input signal, so as to obtain an offset lookup table value; an interpolation factor generating section, for generating an interpolation factor in accordance with the modulus value of the input signal; a multiplying section, for multiplying the offset lookup table value with the interpolation factor; and a summating section, for adding a product obtained by the multiplying section to the base lookup table value, so as to obtain a predistortion value.
REFERENCES:
patent: 7023273 (2006-04-01), Johnson et al.
patent: 7149257 (2006-12-01), Braithwaite
patent: 7414470 (2008-08-01), Okazaki
Li Hui
Shi Zhan
Zhou Jian-Min
Choe Henry K
Fujitsu Limited
Katten Muchin & Rosenman LLP
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