Memory polynomial-based power amplifier model and hardware implementation method thereof

Abstract

The invention discloses a memory polynomial-based power amplifier model and a hardware implementation method thereof, and the method comprises the steps: dividing a memory polynomial complex baseband model into a formula and a formula, and achieving the two formulas through an LUT module and a convolution module respectively; inputting the signal x (n) into a convolution module; inputting the signal x (n) into an LUT module for joint addressing, and finding out lookup table contents corresponding to the input signal stored in the LUT module, namely signals x(n)|x(n)|2, x(n)|x(n)|4... x(n)|x(n)|2K; the LUT module outputs the signals x(n)|x(n)|2, x(n)|x(n)|4... x(n)|x(n)|2K to the convolution module in parallel; and performing convolution operation on the signals x (n), x(n)|x(n)|2, x(n)|x(n)|4... x(n)|x(n)|2K and an externally input complex gain coefficient Akq through a convolution module to obtain an output signal y(n). Compared with the prior art, less hardware multipliers can be consumed, the hardware design is simpler, excessive address control logic and sequential control logic are not needed, the operation period is shorter, and the frequency of the predistortion system is improved.

Description

technical field [0001] The invention relates to the technical field of digital predistortion, in particular to a memory polynomial-based power amplifier model and a hardware implementation method thereof. Background technique [0002] The key to researching digital pre-distortion technology lies in the fitting of the power amplifier behavior model. Only through an accurate mathematical model can the hardware circuit describe the accurate power amplifier behavior, so that the digital pre-distortion technology can obtain the best pre-distortion effect in practical applications. . [0003] Current power amplifier models include Volterra series models, memory polynomial models (Memory Polynomial, MP), generalized memory polynomial models (Generalized Memory Polynomial), and the like. Among them, the Volterra series is the most widely used mathematical model in simulation software, because it contains many cross terms and power terms, where the definition of the cross term is th...

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Problems solved by technology

[0018] The object of the present invention is to provide a kind of power amplifier model based on memory polynomial and hardware implementation method thereof, to at least solve the existing hardware implementation method based on memory polynomial power amplifier model because the data in the look-up table needs to be updated in real time, for comprising self-adaptive algorithm The predistortion system, each predistortion module complex gain coefficient a kq The iterative replacement will generate a huge data flow, resulting in slower data update speed and technical problems such as lowering the overall operating frequency of the system.

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