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Broadband measuring device based on undersampling compensation and method thereof

A broadband measurement and undersampling technology, applied in electrical components, transmission systems, etc., can solve the problems of high price, the instrument cannot meet the PA linearization sample rate and dynamic range, etc., to reduce production costs, solve bottleneck problems, and reduce sampling. The effect of rate requirements

Inactive Publication Date: 2019-03-26
NAVAL UNIV OF ENG PLA
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Problems solved by technology

Only the expensive VSA can meet the characteristic test problems under the excitation of some broadband signals
Moreover, in some cases, the available instruments cannot meet the requirements of PA linearization sample rate and dynamic range, and the sampling rate limitation of the feedback loop becomes the bottleneck problem of the current broadband transmission system measurement technology

Method used

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  • Broadband measuring device based on undersampling compensation and method thereof
  • Broadband measuring device based on undersampling compensation and method thereof
  • Broadband measuring device based on undersampling compensation and method thereof

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Embodiment example

[0041] Implementation example: In order to facilitate the description of the specific operation of the present invention, this implementation solution provides a detailed description of the implementation of signal reconstruction in the case of N=2. Suppose the sampling rate of the original input signal is f s ,Such as Figure 4a As shown, and the original signal is called the first signal, and then the original input signal is delayed by one sample to form a new sample sequence, called the second signal, and sequentially cascaded with the first signal to form a new synthetic input signal, Such as Figure 4b As shown, using the sampling rate Sampling the composite input signal yields the odd terms of the first signal and the even terms of the second signal, such as Figure 4c shown. Theoretically, this sampling method can obtain a complete sequence of signals, but the sampled signal sequences are not arranged in an orderly manner, and there are intersections and overlaps ...

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Abstract

The invention provides a broadband measuring device based on undersampling compensation, comprising a baseband signal processing unit, a digital to analog converter, an up-conversion unit, a coupler,a down-conversion unit and an analog to digital converter. An output of the baseband signal processing unit is connected to an input of the digital to analog converter. An output of the digital to analog converter is connected to an input of the up-conversion unit. An output of the up-conversion unit is connected to an input of a broadband power amplifier to be tested. An output of the coupler isconnected to an input of the down-conversion unit through an attenuator. An output of the down-conversion unit is connected to an input of the analog to digital converter. An output of the analog to digital converter is connected to an input of the baseband signal processing unit. The broadband measuring device based on undersampling compensation and the method thereof can reduce requirements forthe sampling rate of the analog to digital converter and reduce the cost.

Description

technical field [0001] The invention relates to the field of a nonlinear characteristic extraction method of a broadband power amplifier, in particular to a broadband measurement device and method based on undersampling compensation. Background technique [0002] With the rapid development of wireless communication technology, the current and future wireless communication systems require high data transmission rates, and broadband modulation schemes with high spectrum utilization have been widely used, but spectrum spread distortion occurs in the case of broadband excitation power amplifiers, such as figure 1 shown. In order to ensure the quality of communication, it is necessary to perform linear compensation for the broadband nonlinearity of the transmitting system to ensure that the linearization index of the transmitting system meets the requirements of the industry. Among them, how to effectively measure and analyze the characteristics of the transmitting system (mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/12H04B1/04
CPCH04B1/0475H04B1/123
Inventor 李伟孟进葛松虎何方敏邢金岭吴灏
Owner NAVAL UNIV OF ENG PLA
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