Linearization of Radio Frequency Transceivers and Test Systems Through Dynamic Extraction of Complex Nonlinear Models Thereof

摘要

Dynamic characterization of complex high-order nonlinearity in transmitter (TX) and receiver (RX) signal chains of transceiver systems can be efficiently and accurately performed. A loopback connection may be used to facilitate self-characterization. Appropriate RX and TX configuration settings may be developed to facilitate de-coupling of individual RX and TX nonlinearities from measured cascade nonlinearity. The system's high-order response to a two-tone signal generation may be measured, and complex mathematical analysis may be performed to identify and isolate passband nonlinear components to extract a high-order memory-less model for the system. The extracted system model may be used in the corrective and non-iterative pre-distortion of generated signals and in the post-distortion of received signals to improve linearity performance of the transceiver. The memory-less model and the analytical system are effective in improving performance of class-A-amplifier-based signal chains that are common in test and measurement systems and channel emulation systems.

主权项

1. A method for obtaining a complex high-order nonlinear model of a first signal path of a radio frequency (RF) system, the method comprising:
adjusting the first signal path to operate according to specified settings; configuring a second signal path of the RF system to operate in a high-linearity mode; generating, in the first signal path, a test signal at a desired level; acquiring, by the second signal path, the generated test signal; and extracting, by a processing unit, a complex high-order nonlinear model representative of the first signal path, comprising analyzing, by the processing unit, the acquired test signal according to a specified algorithm.