An Efficient Predistortion Method for 100MHz Signal Bandwidth Power Amplifiers

Abstract

The invention relates to a high-efficiency pre-distortion method for power amplifiers with a bandwidth of 100 megahertz signals, and belongs to the technical field of wireless communication. The predistortion method of the present invention only performs linearization compensation to part of the output signal of the power amplifier (PA), and adopts a multiphase DPD (digital predistortion) structure; the present invention adds an intelligent signal processing module in the digital predistortion system, and the intelligent signal processing The module sets the number of half-band filters according to the DPD linearization bandwidth to be compensated, calculates the ADC (analog-to-digital conversion) undersampling factor and the number of multi-phase DPD branches in combination with the source signal parameters, and correlates the undersampled signal with the output signal of DPD The acquisition delay of the linear calculation is used to ensure that the two data signals are aligned during parameter training. The invention can simultaneously lower the DPD data throughput and the sampling bandwidth of the feedback loop in conjunction with each other, realize the flexible setting of the DPD data throughput, and save the hardware implementation cost of the DPD.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a high-efficiency pre-distortion method for power amplifiers with a bandwidth of 100 megahertz signals. Background technique [0002] The power amplifier (Power Amplifier, PA) plays an important role in the wireless communication system. It is used to amplify the modulated signal to a certain power value, and then transmit it through the antenna to ensure that the receiver can receive the signal with high signal-to-noise ratio. , to ensure the communication quality. The nonlinearity of the PA when the operating point is close to saturation will lead to in-band distortion of the transmitted signal, and at the same time, spectrum leakage will cause adjacent channel interference, which will seriously affect the communication quality. In addition, when the operating point of the PA is far away from the saturation region and close to the linear region, the ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of high ADC sampling rate and large DPD data throughput required for PA linearization in the current broadband communication system, and proposes a high-efficiency pre-distortion method for power amplifiers with 100-megahertz signal bandwidth, which solves the problem of PA linearization , while ensuring spectrum effectiveness and power amplifier effectiveness, it can reduce ADC sampling rate and DPD data throughput, save bandwidth resources, reduce hardware implementation cost, and reduce power consumption

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