Dynamic linearization system of power amplifier based on mode recognition, and method

Abstract

The invention discloses a dynamic linearization system of a power amplifier based on mode recognition. The dynamic linearization system comprises a feature vector generation module, a multilayer sensor module, a predistortion coefficient lookup table module, a vector signal module, a transmitting link module, a power amplifier module and a feedback loop module. The invention further discloses a method using the dynamic linearization system. The dynamic linearization system disclosed by the invention adopts a new standard, that is, an amplitude modulation to amplitude modulation (AM / AM) mode, to recognize a working state of the power amplifier, and uses a recognition result of a multilayer sensor neural network on the power amplifier AM / AM to index different predistortion coefficients so asto achieve the dynamic linearization of the power amplifier. Compared with the traditional power lookup tables and power indexing algorithms, the method has the advantages of being able to provide better linearization performance. In addition, the dynamic linearization system disclosed by the invention is also capable of solving the linearization problem under a dynamic condition of the power amplifier caused by many other non-power factor changes such as temperature, frequency, bandwidth, signal type, etc.

Description

Technical field [0001] The present invention relates to a power amplifier linearization system and method, in particular to a power amplifier dynamic linearization system and method based on pattern recognition. Background technique [0002] In the fifth generation wireless communication system (5G), dynamic power transmission technology will be widely used to achieve efficient use of power resources. As a key component in the 5G system, the power amplifier will not only exhibit static in-band distortion and out-of-band distortion in traditional systems, but also dynamic state changes caused by dynamic changes in the input signal power. This inevitably affects the quality of the demodulated signal. The traditional digital predistortion technology is a common technology used to eliminate the static nonlinear distortion of the power amplifier and maintain its high efficiency. However, this dynamic power transmission scenario will bring new challenges to the linearization task of ...

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Problems solved by technology

[0003] However, due to the very complex characteristics of power amplifiers, the traditional dynamic linearization methods based only on power indicators have some shortcomings, which is reflected in that even at a fixed input signal power level, the state of the power amplifier will change Variation due to many other non-power changes, e.g. thermal effects

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