Digital post-distortion linearization of wideband wireless receiver nonlinearity

In this paper, we develop a new digital post-distortion technique for linearizing wideband wireless receiver nonlinearity primarily from the low noise amplifier (LNA) in Software Defined wireless (SDR) systems. This goal is achieved by combining an adaptive digital post-distorter in the transceiver in such a way as to compensate for interference resulting from the LNA´s. The proposed technique simultaneously maintains the good performance characteristics of inductively degenerated common source (CS) LNAs´ base SDR transceiver while improving linearity. We show an improvement in IIP3 by a factor greater than 7.8dB in the worst case and as high as 16.8dB. Since this technique is applied to the digital base-band, the number of components and therefore the size and cost of analog parts of the LNA is reduced.