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

A technology of TD-SCDMA and vector amplitude error, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as complex implementation process, long calculation time, and inability to identify bit errors, and achieve the effect of improving test efficiency

Inactive Publication Date: 2009-09-16
湖北众友科技实业股份有限公司
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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 rece

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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

[0021] 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.

[0022] 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:

[0023] 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;

[0024] 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; 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 relates to a method and device for measuring vector magnitude errors used in TD-SCDMA equipment testing, in particular, it relates to using the signal itself to restore a reference signal to realize the measurement of vector magnitude errors, and the present invention is applicable to vector magnitude errors of TD-SCDMA equipment Amplitude error measurement. 2. Background technology [0002] What is used in the TD-SCDMA system is QPSK modulation, which is a non-constant envelope modulation. Since there are errors in the amplitude, the phase error and frequency difference are not enough to reflect the modulation accuracy. Therefore, a method that can A comprehensive measure of signal magnitude error and phase error. On the constellation diagram, the error vector can clearly reflect the damage degree of the signal, so an error vector magnitude (EVM: error vectormagnitude) parameter is proposed. [0003] There are certain differ...

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Application Information

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IPC IPC(8): H04B17/00H04L27/22H04B17/26
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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