Patent ID: 8467747
Filing Date: 2013-06-18
Classification: H03F,H04B,H04L

Abstract:
1. A multi-band digital predistortion system comprising a multi-band input signal wherein the bands are centered on separate frequencies and the bandwidth of each band is substantially less than the frequency separation between the bands; at least one power amplifier for providing an amplified output including a distortion characteristic; input aliasing logic for creating aliased images of each band, wherein the aliased image of a first band is in one Nyquist zone and the aliased image of a second band is in another Nyquist zone, each of the one Nyquist zone and the other Nyquist zone having a width of half of a sampling rate of the input signal; a feedback signal derived from the amplified output, including a representation of at least a portion of the distortion characteristic; and predistortion logic responsive to the aliased images for generating predistortion coefficients for linearizing the output of the power amplifier.