Joint Compensation of I/Q Impairments and Power Amplifier Nonlinearity for Concurrent Dual-Band Transmitters Using Two-Box Model

A novel two-box model for joint compensation of nonlinear distortion introduced from both in-phase/quadrature modulator and power amplifier is proposed for concurrent dual-band wireless transmitters. Compensation of nonlinear distortion is accomplished in two phases, where phases are identified separately. It is shown that complexity of the digital predistortion is reduced. The performance of the proposed model is evaluated in terms of ACPR, EVM, and NMSE improvements using 1.4 MHz LTE and WCDMA signals.