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Digital pre-distortion method of frequency hopping communication system

A digital pre-distortion and frequency-hopping communication technology, applied in the field of digital pre-distortion, can solve the problems of inability to complete the linearization of the frequency-hopping communication system, signal distortion, etc., and achieve the effect of fast real-time pre-distortion and less hardware resources

Active Publication Date: 2015-02-18
西安烽火电子科技有限责任公司
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Problems solved by technology

[0003] In the frequency hopping communication system, the frequency of the transmitter is constantly changing according to certain rules. At the same time, the RF power amplifier of the frequency hopping communication system produces signal distortion caused by third-order and fifth-order intermodulation in order to improve efficiency and power. The simulated linear Linearization technology and common digital pre-distortion technology cannot complete the linearization of frequency hopping communication system

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Embodiment Construction

[0017] In order to clearly illustrate the technical solution of the present invention, adaptive digital pre-distortion is described here. In the actual application process, the predistortion technology has the following unstable factors: due to temperature changes, device aging, etc., the characteristics of the power amplifier change, as well as the bias voltage, channel change, input power change, and component parameter drift, etc., make the expected nonlinearity very large Large changes; the microwave parameters of the device change, which causes the phase change of the main link and makes the pre-distortion invalid. These effects are particularly obvious when working in a wide frequency band (frequency bandwidth greater than 1 octave), because the randomness of the excitation power and the random variation of the peak-to-average ratio of the signal affect the compensation; the random variation of the spectral distribution of the excitation signal will cause Compensation ch...

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Abstract

The invention belongs to the technical field of frequency hopping communication system reliability and discloses a digital pre-distortion method of a frequency hopping communication system. The method includes: acquiring multinomial coefficients, corresponding to the ith frequency point and the jth temperature, in the expression of a digital pre-distortion device function, and using x(n) to indicate n-moment input signal of a digital pre-distortion device; acquiring the simplified expression of the digital pre-distortion device function, and by the digital pre-distortion device, acquiring the value of each signal polynomial in a lookup table according the signal received at the current moment and the signal received at Q-1 moment before the current moment; calculating the value of the digital pre-distortion device function F[x(n)], and completing linear processing of the radio frequency amplifier in the frequency hopping communication system according to the value of the digital pre-distortion device function F[x(n)].

Description

technical field [0001] The invention belongs to the technical field of frequency hopping communication system reliability, and in particular relates to a digital predistortion method for a frequency hopping communication system, which solves the linearity problem of the frequency hopping communication system and aims to reduce the Non-linear distortion, lower bit error rate. Background technique [0002] In the frequency hopping communication system, in order to improve the output power and efficiency, the radio frequency power amplifier (referred to as radio frequency power amplifier) ​​usually works in the nonlinear region, which will inevitably produce third-order and fifth-order intermodulation products, showing strong nonlinearity. Linearization technology is an effective way to solve the nonlinear problem of RF power amplifiers. Linearization technology is mainly divided into two categories: analog method and digital method. Analog methods include analog predistortion...

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Application Information

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IPC IPC(8): H04L25/49
Inventor 郑光明杨勇王小军刘为周勇敢张凯李林峰葛亮
Owner 西安烽火电子科技有限责任公司
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