Title :
Behavioral Modeling of Quadrature Modulators for Characterization of Nonlinear Distortion
Author :
Li, Minsheng ; Hoover, Lowell ; Gard, Kevin G. ; Steer, Michael B.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC
Abstract :
A behavioral model of the nonlinear response of a microwave quadrature modulator is developed to investigate the impact of modulator nonlinearity on spectral regrowth of wireless communications signals. The nonlinear characteristic of each input is modeled by a complex power series. The model parameters are extracted from the single-tone amplitude-to-amplitude (AM-AM) and amplitude-to-phase (AM-PM) measurement data. The model was verified with an uplink WCDMA pilot signal applied to the quadrature modulator. The measured ACLR data is in excellent agreement with the modeled results
Keywords :
code division multiple access; modulators; nonlinear distortion; phase modulation; quadrature amplitude modulation; ACLR data; AM-AM measurement data; AM-PM measurement data; WCDMA pilot signal; amplitude-to-amplitude measurement data; amplitude-to-phase measurement data; behavioral model; microwave quadrature modulator; modulator nonlinearity; nonlinear distortion; nonlinear response; spectral regrowth; wireless communications signals; Baseband; Circuit simulation; Distortion measurement; Multiaccess communication; Nonlinear distortion; Power amplifiers; Power system modeling; Pulse amplifiers; RF signals; Radio frequency;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249959
