Reducing power spectrum regrowth for concurrent dual-band OFDM signals

Concurrent multi-band or dual-band transmitters and receivers are the key components for future wireless communication. However, the nonlinearity and memory effects caused by power amplifiers will degrade the performance of transmitters and receivers and produce undesired interference to other channels. In this article, the out-of-band intermodulation is discussed, and a method of two-dimensional digital (2D-DPD) is applied to linearize the spectrum for dual-band OFDM signals based on an inverse auto-regression moving-average (IM-ARMA) model.