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Method for testing 3G terminal radio frequency consistency

A test method and consistent technology, applied in transmitter monitoring, transmission monitoring, code division multiplexing systems, etc., can solve the problems of difficult reference signal recovery, low test accuracy, low test speed, etc., and save calculation effect of complexity

Active Publication Date: 2006-08-02
BEIJING STARPOINT TECH COMPANY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the EVM test objectively requires high-speed data sampling and accurate recovery of the reference signal, the test speed is slow, the reference signal recovery is difficult, and the test accuracy is not high. EVM test method has become a research hotspot in the field of 3G terminal conformance test

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  • Method for testing 3G terminal radio frequency consistency
  • Method for testing 3G terminal radio frequency consistency
  • Method for testing 3G terminal radio frequency consistency

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Embodiment Construction

[0022] The terminal conformance testing method of the present invention will be described below in conjunction with the accompanying drawings.

[0023] There are certain differences between the actual digital modulation signal and the ideal signal in amplitude, phase and frequency, and these differences can be expressed by the error vector on the I / Q plane, as shown in the attached figure 1 shown. EVM (Error Vector Magnitude), that is, the vector error magnitude, defines the precision error between the digital modulation signal and the ideal signal in the time domain. It establishes a relationship between the error vector e(n) and the reference vector r(n), and the result is expressed It is the percentage of the error vector magnitude relative to the reference vector magnitude, and the EVM index can be calculated by (1).

[0024] EVM = Σ n = ...

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Abstract

This invention discloses a kind of consistency testing method for 3G terminal EVM index. After the terminal enters 12.2kbps calling cycle measuring mode, the received pre-modulated terminal data is split into L groups in terms of different sampling time. The data in each group are undertaken the frequency deviation estimation and the initial phase estimation. The EVM measured values are respectively calculated according to data of each group. The smallest EVM value is the terminal EVM index. The frequency deviation and initial phase calculated from those datum corresponded to the smallest EVM value are the system testing output. This invention can get precise frequency deviation consequence and decrease calculation complexity.

Description

technical field [0001] The invention relates to the technical field of Code Division Multiple Access (CDMA) mobile communication, in particular to the field of 3G terminal radio frequency consistency test. Background technique [0002] Conformance testing has been a research field that the international communication industry has paid close attention to in recent years. With the approaching date of 3G network operation, research on 3G terminal standards and terminal testing have become a top priority. As an important part of terminal RF conformance testing, EVM testing plays an irreplaceable role in terminal equipment development, production line testing, and RF fault location. Since the EVM test objectively requires high-speed data sampling and accurate recovery of the reference signal, the test speed is slow, the reference signal recovery is difficult, and the test accuracy is not high. EVM test method has become a research hotspot in the field of 3G terminal conformance ...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04J13/00H04B17/14H04B17/309H04B17/336
Inventor 金磊王冰李春媛张平
Owner BEIJING STARPOINT TECH COMPANY