Self-adaptive feedforward linear power amplifier device based on pilot frequency and control method

Abstract

The invention relates to a self-adaptive feedforward linear power amplifier device based on pilot frequency and a control method. The device comprises a carrier cancellation ring, an error cancellation ring, a pilot frequency generation and detection circuit and a self-adaptive control circuit; the carrier cancellation ring is used for extracting error signals generated by active power amplification; the pilot frequency generation and detection circuit and the self-adaptive control circuit are used for monitoring amplitude phase matching in two loop circuits and adjusting the amplitude and the phase by the control method in a self-adaptive mode so as to lead the cancellation effect of the loop circuit to be the best. The invention has the beneficial effects that the self-adaptive feedforward linear power amplifier device based on pilot frequency and the control method have compact structure, simple method, simple and effective control method, and greatly improves the linearity and efficiency of a radio-frequency power amplifier. By injecting cancellation degree of error signals to the output end of a pilot frequency signal monitoring device, the invention adjusts the amplitude phase matching of the carrier cancellation ring and the error cancellation ring in a self-adaptive mode and improves the stability and reliability of the radio-frequency power amplifier.

Description

technical field [0001] The invention relates to a radio frequency power amplifier linearization technology in the field of communication technology, and is particularly suitable for a pilot-based self-adaptive feedforward linear power amplifier device and a control method in the field of broadband multi-carrier digital mobile communication. Background technique [0002] With the rapid and continuous growth of wireless communication service requirements and the increasingly tight wireless spectrum resources, it is objectively required for wireless communication systems to transmit more information in a limited frequency band. In order to make full and effective use of spectrum resources, wireless communication systems tend to adopt linear modulation methods and multi-carrier technologies with high data transmission rate and spectrum utilization. The radio frequency signal envelope fluctuations generated by these methods and technologies are particularly large, and the peak-to...

AI Technical Summary

Problems solved by technology

[0003] Due to the inherent nonlinear characteristics of RF power amplifiers, amplifying non-constant-amplitude envelope signals will produce distortion, and severe compression will occur on peak signals, which will cause the spectrum of the input signal to spread, resulting in EVM (vector modulation error) and BER ( The deterioration of the bit error rate) will also interfere with the communication quality of adjacent channels and generate a lot of noise in the system

Therefore, the 3GPP specification stipulates the requirements for spectrum radiation shielding (Spectrumemission mask), and it is difficult for the so-called high power amplifier to meet this requirement

Although the use of class A power amplifier may meet the requirements, its efficiency is too low, and it is difficult to amplify the power to the order of tens of watts

Images