Compensation method of error vector magnitude (EVM)

An error vector magnitude and compensation method technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of complex internal composition and difference in measurement results, and achieve the effect of great practical value and wide application prospects.

Inactive Publication Date: 2012-07-04
SHANGHAI PRECISION METROLOGY & TEST RES INST
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Problems solved by technology

Since the vector analysis instruments produced by various instrument manufacturers around the world are comprehensive high-performance analysis equipment with multiple test capab

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  • Compensation method of error vector magnitude (EVM)
  • Compensation method of error vector magnitude (EVM)
  • Compensation method of error vector magnitude (EVM)

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Embodiment Construction

[0010] In practical applications, the vector signal analyzer mixes the RF digital vector signal to the intermediate frequency, performs digital sampling, decomposes it into two orthogonal I-channel and Q-channel signals through the quadrature demodulator, and then compensates the signal by amplitude and phase Through a series of data processing and calculations, the digital baseband information of the I channel and the Q channel are displayed in the time domain and the frequency domain respectively, and the radio frequency spectrum and demodulation parameters and values ​​can also be seen. Measure the digital vector signal with a vector signal analyzer, determine the value of each demodulation parameter, analyze and decompose the technical performance of each demodulation parameter of the vector signal analyzer step by step, and calculate the theoretical estimate of the error vector magnitude. The specific steps are as follows stated. As shown in Figure 1, it is a connection b...

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Abstract

The invention provides a compensation method of error vector magnitude (EVM). The method comprises the following steps: according to a mathematical expression of a digital vector, analyzing technical parameters which are related to the EVM of vector demodulation, determining parameters which are generated after vector demodulation and influence the EVM, respectively calculating all the technical parameters influencing the EVM so as to get technical components influencing the EVM value, and calculating a theoretical estimated value of the EVM by square-sum-root calculation. According to the compensation method disclosed by the invention, the scientific and reasonable compensation of the EVM can be realized and a great effect of evaluating the measurement results of measuring the EVM by various vector signal analyzers can be realized. In the technical field of metering, the compensation method has greater practical value, plays a role in guiding technical development and production and further has the advantage of extensive application prospect.

Description

technical field [0001] The invention relates to the theoretical estimation of the magnitude of the error vector during the analysis and measurement of the digital vector signal. Specifically, it relates to a theoretical estimation method of error vector magnitude. Background technique [0002] In the process of continuous development of digital communication technology, the analysis of digital vector signal measurement is getting more and more in-depth. Among them, the measurement and simulation theory estimation of error vector magnitude (EVM) are related to the rationality of evaluating the measurement results. Since the vector analysis instruments produced by various instrument manufacturers around the world are comprehensive high-performance analysis equipment with multiple test capabilities and complex internal components, the error vector magnitude (EVM) for measuring digital vector signals ) There are also some differences in the measurement results of this indicator...

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Application Information

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IPC IPC(8): H04B17/00H04B17/309
Inventor 陈斌
Owner SHANGHAI PRECISION METROLOGY & TEST RES INST
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