Self-adaptive digital amplitude modulation and phase modulation system

Abstract

The invention discloses a self-adaptive digital amplitude modulation and phase modulation system. The system comprises a pre-amplification unit used for first-stage pushing, N power amplification units arranged in parallel, a combiner unit, a detection unit used for detecting absorption power and forward power, a directional coupling unit and a micro-processing unit, wherein the pre-amplificationunit receives a radio-frequency input signal from an excitation unit and divides the radio-frequency input signal into N paths of radio-frequency signals to be output to the power amplification units;the power amplification units output the further amplified radio-frequency signals to the combiner unit; the detection unit is used for acquiring absorption power information and forward power information from the combiner unit and the directional coupling unit respectively and outputting the information to the micro-processing unit; the micro-processing unit is used for carrying out self-adaptive calculation processing to obtain independent phase and gain adjustment signals and then combining the signals to be output to the pre-amplification unit for carrying out independent amplitude and phase adjustment. The system has the advantages that the output power can be quickly and accurately adjusted without scanning and measuring specific amplitude and phase reading values by a network analyzer.

Description

technical field [0001] The invention relates to a technology in the field of signal processing, in particular to an adaptive digital amplitude modulation and phase modulation system. Background technique [0002] In a transmitter system with multiple power amplifier modules (abbreviated as power amplifiers), there will be differences in amplitude and phase between the power amplifier modules due to inconsistencies in device characteristics and electrical lengths of the modules. However, in order to improve the efficiency and output power of power combining, it is necessary to make this difference as small as possible. The existing processing technology is mainly: use precision measuring instruments to measure the specific values ​​of the amplitude and phase between modules, adjust the phase by adjusting the length of the radio frequency line, and adjust the amplitude through the attenuator. In this way, not only external instruments are required, but also manual measurement...

AI Technical Summary

Problems solved by technology

In this way, not only external instruments are required, but also manual measurement is required, and the adjustment methods such as line length are not accurate and time-consuming

The most serious thing is that if the original measurement and compensation will no longer be accurate due to changes in ambient temperature, device aging, etc., it will be time-consuming and laborious to re-measure and compensate.

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