Digital Predistortion for Multiuser Hybrid MIMO at mmWaves

Digital Predistortion for MIMO Transmitters Using Multi-Channel Error Feedback Adaptation

“…Content may change prior to final publication. For the iteration (11), the condition for convergence is that f (•) satisfies (9). In our scenario, both f ( z a ) − f ( z b ) 2 and z a − z b 2 are bounded.…”

“…holds, a value for ξ can be found to make (9) satisfies. Therefore, (12) is a sufficient condition for (9). By denoting z a and z b as…”

“…Some researches have shown that digital predistortion (DPD) can be used to compensate for the nonlinearity and crosstalk at the transmitter side [7], [9]- [14]. For instance, Bassam et al in [7] proposed a crossover digital predistorter (CO-DPD) model, which includes the cross-terms of the input signals in different channels.…”

“…For instance, Bassam et al in [7] proposed a crossover digital predistorter (CO-DPD) model, which includes the cross-terms of the input signals in different channels. Other researches (see, e.g., [9]- [14]) also proposed novel predistorter models for MIMO transmitters with crosstalk to improve the perfor-mance or reduce the complexity. However, none of them have considered enhancing the performance of DPD coefficients extraction for applications.…”

Novel Iterative Clipping and Error Filtering Methods for Efficient PAPR Reduction in 5G and Beyond

“…The DPD is based on the closed-loop architecture and on the injection principle [31], where the DPD injects to the PA input a low power nonlinear signal with similar structure to the nonlinear distortion introduced by the PA but with opposite phase, so that the distortion at the PA output is minimized. Memory polynomial basis functions (BFs) [20] are considered as the regressors of the DPD.…”