Adaptive Digital Predistortion Method for Broadband Spread Frequency Hopping System
A technology of digital predistortion and spread frequency hopping, which is applied in the transmission system, synchronization/start-stop system, electrical components, etc. It can solve the problems that the change of device characteristics over time cannot be compensated, the modulation bandwidth is limited, and the application is not widely used.
Active Publication Date: 2022-03-22
NO 63921 UNIT OF PLA
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The feedback method is simple to implement, but it has disadvantages such as limited modulation bandwidth and loop instability, and is not widely used; the feedforward linearization technology uses an open-loop circuit, and its basic idea is very close to the aforementioned feedback method, but the feedforward method has no The change of device characteristics over time cannot be compensated, and will reduce the efficiency of the power amplifier, and cannot fundamentally solve the nonlinear problem of the memory effect
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[0065] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that are used in the embodiments. Apparently, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts.
[0066] When describing the embodiments of the present invention, the terms "vertical", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", " The orientation or positional relationship expressed by "horizontal", "top", "bottom", "inner" and "outer" is based on the orientation or positional relationship shown in the relevant drawings, which are only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred to must have a particu...
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The present invention relates to an adaptive digital pre-distortion method for a wideband spread frequency hopping system, comprising: a. using a wideband ADC to directly collect the fed back high power amplifier output signal; b. utilizing the recovered high power amplifier output data and input data The difference forms negative feedback to build a high power amplifier nonlinear distortion model; c. Calculate the pre-distortion model parameters according to the high power amplifier nonlinear distortion model parameters, and complete the digital pre-distortion processing of the power amplifier input signal. The present invention is an adaptive digital and distortion method combining "coarse estimation + fine tracking", aiming at the real-time change of the nonlinear distortion characteristics of the high power amplifier of the broadband spread frequency hopping system with the spread spectrum frequency range corresponding to different frequency hopping points Features: use wideband ADC to complete RF direct acquisition of the feedback signal, and use the difference between the output data of the high power amplifier and the input data to form negative feedback to complete the nonlinear distortion modeling of the high power amplifier, reducing the impact of the nonlinear memory effect of the high power amplifier The quality of the signal produced by wideband spread frequency hopping systems deteriorates.
Description
technical field [0001] The invention relates to the technical field of radio communication, in particular to an adaptive digital pre-distortion method used in a broadband spread frequency hopping system. Background technique [0002] In recent years, studies have found that the distortion components produced by the nonlinear characteristics of microwave high-power amplifiers are not constant, and will change with changes in characteristics such as input signal amplitude, bandwidth, and operating temperature. This phenomenon that depends on the change of the characteristics of the input signal is called the memory effect of the high power amplifier. The larger the bandwidth of the input signal, the more serious the memory effect in the non-linear region of the high power amplifier, which is an inherent characteristic of the high power amplifier. The spread frequency hopping system is a typical broadband system. It uses the spreading gain and frequency hopping gain of the spr...
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IPC IPC(8): H04B1/713H04B1/715H04L25/49
CPCH04B1/713H04B1/715H04L25/49H04B2001/7152
Inventor 王威张任天黄英高昕刘敏曾富华潘云强周晖程诗序杜小鸣
Owner NO 63921 UNIT OF PLA