Patent ID: 9735741
Date: 2017-08-15
CPC Classifications: H03F

Claim:
1. An electronically-implemented method of predistortion, the method comprising: receiving, by a receiver, a feedback signal indicative of an output of an amplifier, the feedback signal having a feedback signal bandwidth, wherein the receiver has a receiver bandwidth that is narrower than the feedback signal bandwidth; sweeping, by the receiver, through a plurality of isolated sub-bands of the feedback signal to observe the feedback signal bandwidth, the plurality of isolated sub-bands comprising a first isolated sub-band and a second isolated sub-band, wherein a combined bandwidth of the plurality of the isolated sub-bands is greater than half of the feedback signal bandwidth, and wherein sweeping through the plurality of isolated sub-bands comprises: generating a virtual full-rate response for the amplifier based at least in part on the plurality of isolated sub-bands of the feedback signal, adaptively adjusting predistortion coefficients based at least in part on the virtual full-rate response for the amplifier; and using the adjusted predistortion coefficients, applying digital predistortion to cause an input to the amplifier to be predistorted.