Digital Predistortion for Concurrent Dual-Band Transmitters Using 2-D Modified Memory Polynomials

Green Communications: Digital Predistortion for Wideband RF Power Amplifiers

“…Similar solutions were also given in [87], [88], where a LUT combined with an MP model was proposed to improve the model accuracy while considering computational complexity. These models use multiple basis functions in parallel to improve the overall model accuracy and corresponding DPD performance; iii) a multiple-LUT technique (MLT) that uses multiple lookup tables to reduce the quantization error, consequently improving the model accuracy such as the approaches proposed in [60] and [42]; iv) a multi-input enhancement technique (MET), which uses a frequency harmonic analysis technique and corresponding harmonic mapping to enhance the overall performance, such as [54] for the ET system and [89], [52], [90], [35] for the multi-band systems; v) a band-limited optimization technique (BLT) that deals with band-limited DPD problems using band-limited models [34]. The basic concept is to create a proper mapping between input and output of the PA under the band-limited constraints.…”

A Low-Complexity Dual-Band Model for Dual-Band Power Amplifiers Based on Volterra Series

“…It becomes complicated and impractical with the increasing of nonlinearity order. A two-dimensional modified memory polynomial (2D-MMP) model was proposed in [12], which only contains two summations due to the modification of envelope terms. But an extra envelope coupling factor is added in it compared to single-band memory polynomial (MP) model.…”

A new signal injection method with PSO for multi-carrier predistortion

“…In order to meet the linearity requirements, they usually lead to the sacrifice of systems' power efficiency. Moreover, it should be noticed that the nonlinear behavior in multi-carrier transmitters is quite different from that in the single-carrier systems [1]. The multicarrier transmission not only cause the fundamental intermodulation distortion (IMD) entitled intra-band distortion but also the cross-band IMD distortion entitled inter-band distortion [2].…”

“…The less power is, the better effect of restraining inter-band distortion we can get. By calculating the minimum of ε, we can get 1 2) Evaluate the fitness (" ¼ P L n¼1 e inter n ð Þ j j 2 ) of each particle. Store the current position and fitness of each particle into the pbest which is the optimal solution of each particle.…”