2-D Polynomial-Based Model for the Dual-Band Concurrent Transmission in the Presence of Harmonic Interferences
Generation of signals and corresponding trends for multiband, broadband, and ultra-wideband transmitters employ several models, some of which causes predistortion in a dual-band concurrent transmission. Two frequencies of operation are uncorrelated and harmonic products can be filtered out. However, when the harmonic of one signal falls on the frequency band of another signal, it cannot be removed with filters. This paper presents a 2-D harmonic polynomial based model for thedual-band concurrent transmission in the presence of harmonic interferences. Predistortion is implemented using a transmitter and a feedback receiver. With this model, a performance improvement of up to 22 dB in terms of normalized mean square error and performance improvement of up to 20 dB in terms of the adjacent channel power ratio is achieved compared to a dual-band polynomial model without harmonics.