Method for self-adaptive cancellation control of feedforward linear power amplifier optimizing model
A technology of control method and self-adaptive algorithm, applied in power amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve the problems of difficult implementation, low detection sensitivity, poor tuning amplitude, etc., and achieve easy software upgrades and high detection sensitivity , the effect of linear index improvement
Inactive Publication Date: 2009-03-11
COMBA TELECOM SYST CHINA LTD
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For example: an adaptive cancellation control method using pilot tracking (US6081156 patent), this method has poor practical operability, and its linear improvement index is not ideal; an adaptive cancellation control method with a new carrier frequency cancellation loop (US439618 patent), the detection sensitivity of this method is low, the system is complex, and the implementation is difficult; an error loop adaptive cancellation control method (02112416 patent), this method is based on the sampling voltage rather than the sampling power as the criterion and adopts advanced The method of tuning amplitude difference, post-tuning phase difference, and lack of evaluation measures for cancellation results, so it is difficult to achieve the best cancellation effect on intermodulation signals
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[0020] figure 2 It is a flow chart of the adaptive cancellation control method of the feedforward linear power amplifier optimization model provided by the present invention. According to the principle of the feedforward linear power amplifier, the error loop cancellation control must be established on the basis of the main loop cancellation control effect. As shown in the figure, when adjusting for the first time, you should start with the main loop, and adjust the phase parameters first, and then adjust the amplitude parameters. After the main loop is adjusted, adjust the error loop; When the adjustment is further deteriorated, the adjustment of the main loop will cause large fluctuations in the performance of the power amplifier. At this time, it is possible to achieve the index by adjusting the error loop. Therefore, in this case, you can adjust the error loop first. , And adjust the phase parameters first, and then adjust the amplitude parameters. When the index is not reac...
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A self-adaptive cancellation control method and device for feedforward type linear power amplifying optimizing model, which contains timed collecting the current work state of feedforward linear power amplifying, converting voltage to power, adjusting and controlling according to the sequence of first main loop then error loop and first phase difference then amplitude difference, judging stepping adjusting direction by comparing with that before coefficient changing, optimizing point in two directions of optimizing model, making control compensation, scanning whole frequency spectrum until obtaining the optimum effect. The device includes DSP chip, RF collecting point, control signal, memory, SPI bus, EPROM, logic , circuit, power supply module, interface and relative software.
Description
Technical field [0001] The invention relates to a cancellation control method of a feed-forward linear power amplifier used in the field of wireless communication, in particular to a cancellation control method of a feed-forward linear power amplifier adopting an adaptive algorithm of seeking mathematical models. Background technique [0002] Using linearization technology to improve the linearity of power amplifiers is one of the common technical measures in the design and production of power amplifiers, and feedforward technology is currently the mainstream technology used in the design and production of linear power amplifiers. This technology extracts the intermodulation distortion signal from its output and mixes it with the inverted output signal, so as to achieve the purpose of canceling the distorted signal and improving C / I. See figure 1 , The RF input signal is distributed by the power divider 1 and added to the main path node NA and the sub path node NA' respectively....
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IPC IPC(8): H03F1/32H03F3/20
Inventor 潘栓龙刘雪峰
Owner COMBA TELECOM SYST CHINA LTD