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Method and device for measuring vector amplitude error for TD-SCDMA equipment testing

A TD-SCDMA, equipment testing technology, used in transmission monitoring, electrical components, transmission systems, etc., to achieve the effect of improving test efficiency

Inactive Publication Date: 2013-03-13
湖北众友科技实业股份有限公司
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  • Description
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  • Application Information

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Problems solved by technology

The implementation process of this algorithm is very complicated and the calculation takes a long time
In addition, since the reference signal is recovered on the basis of the received signal, it is impossible to identify the bit error of the received signal. When the transmission bit error rate increases, the algorithm will produce a large measurement error

Method used

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  • Method and device for measuring vector amplitude error for TD-SCDMA equipment testing
  • Method and device for measuring vector amplitude error for TD-SCDMA equipment testing
  • Method and device for measuring vector amplitude error for TD-SCDMA equipment testing

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Embodiment Construction

[0022] In order to make it easier for those skilled in the art to understand and implement the present invention, the present invention will be described in detail below through preferred embodiments with reference to the accompanying drawings.

[0023] First, refer to figure 2 , figure 2 It is a flow chart of calculating the vector magnitude error by using the method of directly recovering the reference signal according to the preferred embodiment of the present invention. It mainly includes the following steps:

[0024] In step 1, the signal is received by the receiving device, the received signal is filtered and quadrature demodulated into I and Q signals, refer to image 3 , performing correlation calculation on the I and Q two-way signals to obtain the correlation peak value, and determine the midamble position of the received I and Q signals according to the correlation peak value;

[0025] In step 2, the I, Q signals are demodulated into user data according to the ...

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Abstract

The invention relates to a method and a device for measuring a vector magnitude error for TD-SCDMA equipment testing, wherein a receiving device filters a received signal, divides data into 24 groups, and selects two groups of data in the middle to calculate. The calculation comprises that: a frequency deviation removing device is used to remove a phase error generated by frequency deviation in a signal; a phase correction device corrects the phase of the signal to correct an error of an initial phase; then, a module value of the signal is subjected to normalization processing to acquire a normalized measurement signal Z; the signal is divided into three types according to the magnitude of the module value of the signal and calculated, the equalizing value of the three types projected on coordinate axes are respectively calculated; the equalizing value is used as a module value of an ideal signal to acquire a reference signal R through phase mapping; a value of EVM is calculated according to a formula as a diagram; and the result with the smaller numerical value in two calculating results is taken as the EVM value of the signal.

Description

1. Technical field [0001] The present invention involves a measurement method and device for vector error for the TD-SCDMA device test. Specifically, it involves the use of signal itself to restore the measurement signal to achieve a vector amplitude error. The invention applies to a vector for TD-SCDMA devicesA amplitude error measurement. Second, background technology [0002] The QPSK modulation is used in the TD-SCDMA system. It is a non-constant package modulation. Because there is also an error in the amplitude, the phase error and frequency difference are not enough to reflect the modulation accuracy. Therefore, one type is required.Comprehensively measure indicators of signal amplitude error and phase error.On the constellation map, the error vector can clearly reflect the degree of damage of the signal, so the error vector amplitude (EVM: ERROR VECTORMAgnitude) parameters are proposed. [0003] The actual digital modulation signal and ideal signal have certain differenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/22H04B17/00H04B17/26
Inventor 张家平朱双燕朱富利王海
Owner 湖北众友科技实业股份有限公司
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