Linearizing wideband wireless transmitters using memory effect separation based linearization techniques

Wideband wireless transmitters will exhibit strong memory effects which heavily compromise the linearization performance of traditional memoryless predistorters. In this paper, the nonlinear behaviors of a wideband wireless transmitter are analyzed. According to the nonlinearity analysis, a novel memory effect separation based linearization technique is presented to linearize the wideband wireless transmitter. The novel predistorter is constructed with a static memoryless nonlinear block followed by a dynamic nonlinear block with memory. The static memoryless nonlinear block is utilized to pre-compensate the memoryless nonlinearity, whereas the dynamic nonlinear block is deployed to eliminate the memory effects. The validation results, carried out on a transmitter prototype for WCDMA systems, reveal that the proposed predistortion technique outperforms the traditional Hammerstein predistortion linearization scheme in suppressing the memory effects.