Patent ID: 7215716

Claim:
A method comprising: a pre-distortion of a signal which will be subjected to a non-linear channel wherein the signal will be distorted by the non-linear characteristic of the channel and the pre-distortion will induce the opposite distortion to that of the channel; a method wherein the signal will be converted from a complex I and Q baseband signal to a digital IF composite real signal and the AM/AM and AM/PM pre-distortion is performed on the real composite signal; a method wherein the pre-distorted signal is converted back to a complex I and Q form and the I and Q channels are individually converted to a baseband analog form and then the compound real signal is created at RF after the complex up conversion to RF; a method wherein the post amplified signal is sampled and is compared to the non-pre-distorted compound real signal to determine the error in the AM/AM and AM/PM pre-distortion algorithm; a method wherein the non-linear pre-distortion algorithm is updated with the data from the comparison of the pre-distorted post amplified signal and the non-pre-distorted signals; a method wherein the AM/AM and AM/PM pre-distortion LUTs are dual memories wherein one is updated while the other is used and then they are switched in one symbol time so no data is lost in the algorithm update process; a method where in the AM/PM pre distortion is done digitally; a method where in the AM/PM pre-distortion is done via an analog technique; a method wherein the non-linear pre-distortion algorithm is computed by computing a series model of the non-linear channel by computing a series from the sampled values of the post amplified pre-distorted signal.