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Efficient pre-distortion method for 100MHz signal bandwidth power amplifier

A signal bandwidth, pre-distortion technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, components of amplifiers, amplifiers, etc.

Active Publication Date: 2021-05-11
BEIJING UNIV OF POSTS & TELECOMM
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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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  • Efficient pre-distortion method for 100MHz signal bandwidth power amplifier
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  • Efficient pre-distortion method for 100MHz signal bandwidth power amplifier

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In practice, part of the output signal of the PA can be linearized and compensated, because after the modulated signal passes through the PA, the bandwidth of the output signal is expanded very wide, and only the distortion within the bandwidth near the center frequency needs to be compensated. , the intermodulation distortion beyond the compensation bandwidth range can be filtered out by cascaded filters after the PA. This method mainly relies on the filter, and the influence of the filter on the DPD model is crucial, so this will increase the identification process of the filter model, which is very complicated to implement in engineering, and it has not been used in engineering later, and no one Keep improving. Based on this design idea, the present invention studies how to realize it easily in engineering, and at the same time, the influence of the filter...

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Abstract

The invention discloses an efficient pre-distortion method for a 100MHz signal bandwidth power amplifier, and belongs to the technical field of wireless communication. According to the pre-distortion method, only part of output signals of a power amplifier (PA) are subjected to linear compensation, and a multi-phase DPD structure is adopted; an intelligent signal processing module is added in a digital pre-distortion system, the intelligent signal processing module sets the number of half-band filters according to a to-be-compensated DPD linearization bandwidth, calculates ADC undersampling factors and the number of multi-phase DPD branches in combination with source signal parameters, and performs correlation calculation on an undersampling signal and an output signal of the DPD to obtain time delay; therefore, alignment of two data signals during parameter training is ensured. According to the invention, the DPD data throughput and the feedback loop sampling bandwidth can be reduced in a linkage manner at the same time, the DPD data throughput can be flexibly set, and the hardware implementation cost of the DPD is saved.

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 ...

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3247H03F1/3258Y02D30/70
Inventor 胡欣韩康刘志军孙琳琳张孙王卫东
Owner BEIJING UNIV OF POSTS & TELECOMM
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