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This work attempts to suppress all unfilterable nonlinear distortions in concurrent multi-band power amplifiers (PAs). An even (evenly spaced) mode multi-band model is first derived and then generalized to address intermodulation (IMD) and cross-band modulation products located at the vicinity of the bands of interest. Then, based on only one feedback path, a direct learning method is proposed to...
In this paper a novel approach is proposed for digital predistortion (DPD) with direct learning architecture (DLA) architecture to reduce the computational complexity. In PA behavioral models, the coefficients of volterra polynomial or simplified volterra polynomial are extracted from direct learning or indirect learning, which needs many hardware resources due to its matrix dimension and inverse...
A novel PNM textile with extremely small thickness on the order of a few micron was characterized at millimeter wave frequencies (26.5 - 40 GHz), and the impedance analysis of the material was presented. The results show that the PNM is an excellent absorber for wideband applications; the highly polarized materials can be utilized for polarization detection and sensing applications. The impedance...
Study on a novel polarized nano-material (PNM) textile for microwave application has been carried out in this paper. Based on the PNM textile fabricated by Tsinghua-Foxconn Nanotechnology Center, we set up a waveguide test bed to evaluate different kinds of polarized PNM samples. In this paper, Crossed polarized, horizontal polarized and vertical polarized samples (all in waveguide) have been measured...
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