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EVM calculation method of wcdma signal in non-signaling mode

A calculation method, non-signaling technology, applied in wireless communication, electrical components, etc., can solve the problem of not being able to obtain the DPCCH pilot code, etc., and achieve the effects of improving test efficiency, short time consumption, and simple algorithm

Active Publication Date: 2018-09-14
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In non-signaling mode, it is impossible to get the pilot code of DPCCH

Method used

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  • EVM calculation method of wcdma signal in non-signaling mode
  • EVM calculation method of wcdma signal in non-signaling mode
  • EVM calculation method of wcdma signal in non-signaling mode

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Embodiment Construction

[0024] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0025] see figure 1 , the embodiment of the present invention includes:

[0026] A kind of EVM calculation method of WCDMA signal under the non-signaling mode, comprises the following steps:

[0027] (1) Data sampling: According to the terminal test requirements, N times sampling is performed on the received signal under test (N≥2);

[0028] (2) I / Q separation: separate parity data from the data collected by A / D;

[0029] (3) Matched filtering: use a root-raised cosine filter to perform matched filtering on the I / Q two-way data respectively, and remove redundant data;

[0030] (4) Bit synchronization: sum the modulus values ​​of N groups of sa...

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Abstract

The invention discloses a WCDMA signal EVM calculation method under a non-signaling mode. The method includes: data collecting, I / Q separating, matching filter, bit synchronization, time slot synchronization, frequency deviation calibration, phase calibration and EVM calculation. The method has the advantages that the optimal sampling point data, namely the bit synchronization data of the collected WCDMA modulation signal is found, data of one time slot is extracted by utilizing scramble correlation calculation, and an EVM calculation result can be obtained after precise frequency deviation and phase calibration; WCDMA vector magnitude error calculation under the non-signaling mode is achieved, the method is simple in algorithm and short in time consumption, testing efficiency of WCDMA terminal radio frequency consistency testing is increased, and the method plays a quite important role in WCDMA terminal research and development, production and radio frequency fault positioning and the like.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an EVM calculation method for WCDMA signals in a non-signaling mode. Background technique [0002] WCDMA (Wideband Code Division Multiple Access) terminal radio frequency conformance test is one of the most critical conformance tests in WCDMA demodulation. WCDMA terminal radio frequency conformance test has strict regulations in the standard 3GPP 34.121, among which Error vector magnitude test (EVM: Error Vector Magnitude) plays a very important role in terminal equipment development, production, and radio frequency fault location. [0003] The standard 3GPP 34.121 stipulates that the error vector magnitude test (EVM) has very high requirements on the test equipment, and the EVM index of the terminal transmitter that meets the requirements of the agreement cannot exceed 17.5%. Since the channel response is determined by the characteristics of the sending device, radio frequen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/00
CPCH04W24/00
Inventor 凌云志王志代士磊
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP