Predistortion amplifier system with separately controllable amplifiers

摘要: A wideband predistortion system compensates for a nonlinear amplifier's frequency and time dependent AM—AM AM-PM distortion characteristics. The comprises data structure in which each element stores set of compensation parameters (preferably including FIR filter coefficients) predistorting the input transmission signal. parameter sets are preferably indexed within according to multiple signal characteristics, such as instantaneous amplitude integrated envelope, corresponds respective dimension structure. To predistort signal, an addressing circuit digitally generates indices from is loaded into predistorts This process loading new repeated every sample instant, so that function varies sample-to-sample. generated periodically written by adaptive processing component performs non-real-time analysis amplifier output signals. also implements various identification processes measuring characteristics power generating initial coefficients. In antenna array embodiment, single amplification chains on time-shared basis. embodiment chain includes amplifiers can be individually controlled (e.g., turned ON OFF) conserve power, separately operating state chain.