Amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis

A technology of amplitude modulation signal and measurement method, applied in the field of wireless communication, radio and television, can solve the problems of low accuracy, high complexity, large limitations, etc., and achieve the effect of accurate measurement and simple mathematical relationship

Active Publication Date: 2011-10-05
TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH +1
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Problems solved by technology

However, this law has limitations:
[0004] 1. Using the Bessel function approximation method, the complexity is high but the accuracy is not high
[0005] 2. Regarding the signal shown in formula (1), the traditional method is only applicable to the situation where β<=0.2rad and φ=0 in principle

Method used

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  • Amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis
  • Amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis
  • Amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis

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Embodiment Construction

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] figure 1 is a diagram of the experimental setup based on the method of the present invention. The vector signal analyzer used in the present invention can adopt the vector signal analyzer VSA of Agilent Company, the FSQ vector signal analysis module of R&S Company, etc.

[0027] When the carrier is f d + f b (f d □f b ), the amplitude modulation depth is D, and the modulation frequency is f a In the case of the AM signal accompanied by phase modulation β, the expression is:

[0028] S(t)=(1+Dcos2πf a t)sin[2π(f d + f b )t+βcos2πf a t] (7)

[0029] use frequency f d The CW signal of CW performs quadrature demodulation on S(t), then the vector form of the demodulated quadrature waveform is:

[0030] V(t)=(1+Dcos2πf a t)exp[j(2πf b t+βcos2πf a...

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Abstract

The method provides an amplitude-modulated signal accompanying phase modulation measurement method based on vector analysis, and a mainly used device is a vector signal analyzer. Traditionally, measurement accompanying phase modulation utilizes a frequency spectrum analysis method with more limitations and complex computation. The method reasonably sets the parameters of the vector signal analyzer so as to measure amplitude-modulated signal by a vector demodulation way, has wide applicability and clear and simple mathematic relation.

Description

technical field [0001] The invention relates to the fields of wireless communication, broadcast television and the like, in particular to a method for measuring amplitude modulation signals accompanied by phase modulation based on vector analysis. Background technique [0002] In the fields of wireless communication, broadcast television, etc., amplitude modulation (AM) signal is a widely used signal, as shown in formula (1), for an ideal AM signal, β=0. However, due to the unsatisfactory device characteristics, amplitude modulation is accompanied by phase modulation, resulting in β≠0. β is called the amplitude modulation accompanying phase modulation index, which is the measurement of amplitude modulation signal accompanying phase modulation (incidental PM at AM, hereinafter referred to as accompanying phase modulation) , an important parameter to measure the non-ideal characteristics of AM signals. [0003] Since 2006, researchers have used spectral analysis to calculate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/06G01R25/00
Inventor 周峰张睿陆冰松王南卢民牛张小雨孙景禄张媛媛牟丹
Owner TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH
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