Patent ID: 6081158
Filing Date: 2000-06-27
Classification: H03F,H04L

Abstract:
An adaptive apparatus for compensating a distorting action to information signals by a transmission amplifier of a wide band transmission system, the amplifier subjecting the signals to shifts in signal characteristics away from their intended values, said apparatus comprising:signal provision means for providing a multi-bit digital information signal having a number of bits;memory means for storing a plurality of digital pre-distortion correction values;selection means for selecting a pre-distortion correction value in said memory means using a predetermined number of significant bits of the information signal as a memory address, said predetermined number of significant bits being less than the total bits;combiner means for digitally combining the information signal and the selected pre-distortion correction value to provide a pre-distorted signal;supply means for supplying the pre-distorted signal to an input of the amplifier;sampler means for coupling off a sample signal, resulting from amplification of the pre-distortion of the information signal, from an output of the amplifier;comparison means for comparing the information signal and the sample signal in digital format; andupdate means for modifying the selected pre-distortion correction value in said memory means based upon the comparison by said comparison means.