Digital hybrid mode power amplifier system

A power amplifier and mixed-mode technology, applied in the direction of power amplifiers, amplifiers, transmission systems, etc., can solve the problems that cannot be upgraded, cannot be reconfigured, and cannot be changed

Active Publication Date: 2010-06-02
DALI SYST LTD
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Problems solved by technology

However, conventional DSP-based PD schemes have the following problems: changes in the linearity of the amplifier due to environmental changes such as temperature, and asymmetric distortion of the output signal of the PA due to memory effects
Practical implementation of this embedding presents challenges as it is often inconvenient or impossible to modify the baseband architecture of an existing base station or base

Method used

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Embodiment Construction

[0025]The present invention is a novel RF input / RF output PA system, which uses an adaptive digital predistortion algorithm. The present invention is a hybrid system comprising digital and analog modules. The interplay of both digital and analog blocks in the hybrid system linearizes the spectral regrowth and enhances the power efficiency of the PA while maintaining or increasing the wide bandwidth. Thus, the present invention achieves higher efficiency and higher linearity for wideband complex modulated carriers.

[0026] figure 1 is a high-level block diagram illustrating the basic system architecture, which may be considered, at least for some embodiments, to include digital and analog blocks and feedback paths. The digital block is the digital predistortion controller 14, which includes PD algorithms, other auxiliary DSP algorithms, and associated digital circuits. The analog modules are the main power amplifier 12, other auxiliary analog circuits such as DPA, and rela...

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Abstract

A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

Description

[0001] Cross References to Related Applications [0002] This is a continuation-in-part of US Patent Application S.N.12 / 021,241, filed January 28, 2008, entitled "Power AmplifierTime-Delay Invariant Predistortion Methods and Apparatus," which was subsequently filed April 30, 2007 Continuation-in-Part of U.S. Patent Application S.N.11 / 799,239, entitled "High Efficiency Linearization Power Amplifier For Wireless Communication," which in turn was filed on October 27, 2005, and entitled "System and Method for Digital Memorized Predistortion for Wireless Communication" 11 / 262,079 of U.S. Patent Application S.N. 11 / 262,079, which is a continuation of U.S. Patent Application S.N. 10 / 137,556 entitled "System and Method for Digital Memorized Predistortion for Wireless Communication," now U.S. Patent No. 6,985,704, all These patent applications or patents are hereby incorporated by reference. This application claims priority to US Patent Application S.N. 11 / 961,969, filed December 20, 2...

Claims

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Application Information

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IPC IPC(8): H04B1/02
CPCH04B1/0039H03F1/3247H03F2201/3233H03F2201/3224H04B1/0475H04B1/0014H04B1/0067H03F2200/57H03F3/24H03F1/0288H03F1/32H03F3/20
Inventor 全完锺赵庚浚S·P·斯塔普莱顿金钟宪杨大力
Owner DALI SYST LTD
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