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Broadband digital pre-distortion algorithm based on vector quantization

A technology of digital pre-distortion and vector quantization, which is applied in the direction of constraint-based CAD, improved amplifiers to reduce nonlinear distortion, and special data processing applications. It can solve the problems of insufficient pre-distortion correction capabilities, high computational complexity, and model prediction accuracy. Insufficient and other problems, to achieve the effect of wide applicability, low complexity, and easy realization

Pending Publication Date: 2021-10-01
CHONGQING UNIV
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Problems solved by technology

[0003] Compared with the problems of insufficient model prediction accuracy, high computational complexity, and insufficient pre-distortion correction capability in the current existing various power amplifier modeling, the present invention proposes a vector quantization-based power amplifier digital pre-distortion method

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  • Broadband digital pre-distortion algorithm based on vector quantization
  • Broadband digital pre-distortion algorithm based on vector quantization
  • Broadband digital pre-distortion algorithm based on vector quantization

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Embodiment Construction

[0091] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0092] Build a complete predistortion system, this system includes power amplifier (PA), computer (PC), vector signal generator (VSG), spectrum analyzer (VSA), signal processing board, digital power supply, attenuator, the implementation used The power amplifier is a class F power amplifier with a working frequency of 1.2GHz broadband;

[0093] Use a dual-carrier LTE signal with a bandwidth of 30MHz to test, use a vector signal generator to connect a power amp...

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Abstract

The invention discloses a broadband digital pre-distortion algorithm based on vector quantization, which mainly relates to a digital pre-distortion technology in power amplifier linearization, behavior modeling of a broadband power amplifier and a vector quantization algorithm. On the basis of a K-means algorithm in a vector quantization algorithm, a TDWK algorithm is provided, on the basis of TDWK, the algorithm is improved by considering priori knowledge of the size of an added cluster, and a CTDWK algorithm is provided. A generalized memory polynomial (GMP) model is selected as an independent model of each area, the two algorithms are combined with the GMP model, and a TDWK-GMP model and a CTDWK-GMP model are provided. According to the method, data closer to a real power amplifier output signal can be restored at the same sampling rate, a better pre-distortion effect is achieved, and compared with digital pre-distortion based on a GMP model, the performance is improved to a certain extent. An F-type power amplifier is selected as a test model, and experimental results show that the provided method based on vector quantization has good performance in a power amplifier digital pre-distortion linearization system.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a wideband digital predistortion algorithm based on vector quantization. Background technique [0002] In modern communication systems, due to the dual pressure of high-speed data transmission requirements and limited spectrum resources, in order to improve spectrum utilization, modulation methods such as Quadrature Amplitude Modulation (Quadrature Amplitude Modulation, QAM), Quadrature Phase Keying (Quadrature Phase Shift Keying, QPSK), Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM), etc. are gradually widely used in communication systems. However, this type of modulation technology will increase the design difficulty of RF power amplifiers. This type of signal is an envelope modulation signal with a high peak-to-average power radio (PAPR), which will inevitably introduce nonlinear distortion. At the same average power leve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/36H03F1/32G06F111/04
CPCG06F30/36H03F1/3241G06F2111/04
Inventor 李明玉王亮靳一徐常志代志江
Owner CHONGQING UNIV
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