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Metering method and device for digital modulation parameter based on IQ (Intelligence Quotient) plane elliptical orbit

A digital modulation, elliptical trajectory technology, applied in the field of digital communication, can solve problems such as insufficient

Inactive Publication Date: 2013-04-17
TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH
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Problems solved by technology

Just as the range of a caliper is 10 cm, it is not enough to calibrate the caliper with a gauge block of 0.1 cm in length

Method used

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  • Metering method and device for digital modulation parameter based on IQ (Intelligence Quotient) plane elliptical orbit
  • Metering method and device for digital modulation parameter based on IQ (Intelligence Quotient) plane elliptical orbit
  • Metering method and device for digital modulation parameter based on IQ (Intelligence Quotient) plane elliptical orbit

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Embodiment Construction

[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0045] The invention proposes a new method and device to realize the combined solution of the two problems of value traceability and error setting. The principle of the invention is briefly described below.

[0046] Assuming that the vector V(t) is a vector circle rotating at an angular velocity 2πfb on the orthogonal coordinate system, its expression is shown in formula (1):

[0047]

[0048] If the vector circle V(t) is sampled at the rate of Mfb, the formed constellation points are the M vertices of the regular M polygon in the vector circle. If the VSA has built-in MPSK (such as M=2, 4, 8) demodulation mode , then the M sampling points can be mapped to MPSK constellation points. This shows that V(t) is equivalent to an MPSK signal with symbol rate Rs=MfbBau...

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Abstract

Problems exist in the present metering for a digital modulation parameter, such as a vector error margin. Firstly, a signal source and a vector signal analyzer are mutually measured in a closed loop form, and the source of a metering value is difficult to trace. Secondly, error arrangement is absent. Thus, a new metering method is provided, namely, a method for equivalently obtaining an MPSK (Multiple Phase Shift Keying) signal with a standard modulation error by arranging the attenuation of continuous waves and the phase shift parameter and constructing an elliptical orbit on an IQ (Intelligence Quotient) plane. The amplitude of the error vector of the equivalent MPSK signal is only determined by the radio frequency attenuation and the phase shift parameter and is traceable, is analyzed and calculated and is regulated within a wider scope. The method is verified through a test. The method and device can meter and calibrate a vector demodulating function of a wireless communication comprehensive tester and a vector signal analyzer.

Description

technical field [0001] The invention relates to digital communication technology, in particular to a method and device for measuring and calibrating the vector demodulation function of a wireless communication comprehensive tester and a vector signal analyzer in the information transmission technology. Background technique [0002] Digital modulation signals are an important carrier of modern information transmission and have become one of the cornerstones of the information society, such as QPSK signals used in mobile communication systems and QAM signals used in digital cable TV. Among them, vector error magnitude (EVM) is a key parameter to measure digital modulation error. Like all physical quantities, this parameter must also be measured in a credible and traceable manner. But the measurement of EVM is a worldwide problem. [0003] The following expressions are used in this article: M-ary phase-shift keying digital modulation, expressed as MPSK; vector error magnitude...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34
Inventor 张睿周峰王南卢民牛陆冰松曹晗周镒郭隆庆冉志强王赣牟丹
Owner TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH
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