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Self-adaptive digital pre-distortion linear system of radio frequency power amplifier

A digital predistortion, radio frequency power technology, applied in power amplifiers, improving amplifiers to reduce nonlinear distortion, etc., can solve problems such as numerical instability

Active Publication Date: 2012-05-02
张家港市集成电路产业发展有限公司
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Problems solved by technology

However, there are still many problems in the existing predistortion linearization technology, such as polynomial model and Volterra series model, which will produce numerical instability when estimating parameters, and do not provide a complete and optimized RF power amplifier as a whole. Adapting to Digital Pre-Distortion Solutions

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  • Self-adaptive digital pre-distortion linear system of radio frequency power amplifier
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  • Self-adaptive digital pre-distortion linear system of radio frequency power amplifier

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Embodiment Construction

[0035] The core technical idea of ​​the pre-distortion technology is to insert a digital pre-distortion compensation module containing the inverse characteristic curve of the RF power amplifier at the input end to pre-compensate the distortion caused by the nonlinear amplification of the RF power amplifier. figure 1 It is a schematic diagram of the principle of linearization through pre-distortion technology. Under the condition of large signal output, the output of the RF power amplifier is distorted and close to saturation. When a digital predistortion compensation module including an inverse characteristic curve of a radio frequency power amplifier is inserted, the output of the digital predistortion compensation module is distorted. However, after the distorted signal passes through the RF power amplifier, the linear amplification result of the original input signal is obtained.

[0036] figure 2A block diagram of an embodiment of a radio frequency power amplifier adapt...

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Abstract

The invention discloses a self-adaptive digital pre-distortion linear system of a radio frequency power amplifier, comprising a base band processing module, a digital pre-distortion compensation module and a radio frequency power amplifier; the digital pre-distortion compensation module is connected to the middle of the base band processing module and the radio frequency power amplifier and used for bettering the distortion caused by the nonlinearly amplification of the radio frequency power amplifier. The invention provides the complete and optimized self-adaptive digital pre-distortion linear system structure of the radio frequency power amplifier capable of supporting various pre-distortion models; the invention has the advantages of being wide in applicable range, simple in structure and lower in implement cost at the fixed point.

Description

technical field [0001] The invention relates to a system for realizing the linearization of a radio frequency power amplifier, in particular to an adaptive digital predistortion linearization system for improving the predistortion performance of a radio frequency power amplifier by setting a digital predistortion compensation module, and belongs to the technical field of wireless communication. Background technique [0002] In a wireless communication system, the energy consumption of the wireless communication base station and its supporting equipment accounts for about 80% of the total energy consumption. Among them, the radio frequency power amplifier (RFPA) is one of the most important energy-consuming devices. The power efficiency of the RF power amplifier is generally 10-15%, which is the bottleneck to reduce the power consumption of communication equipment. Improving the power efficiency of RF power amplifiers is of great significance to the energy saving and environ...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/20
Inventor 钱骅冯卫锋黄剑毅沈漫源关心向卫东
Owner 张家港市集成电路产业发展有限公司
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