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Detection method of wireless comprehensive testing instrument for IQ unbalance of single carrier QPSK signal

A wireless comprehensive tester and detection method technology, applied in the field of detection, can solve the problem of high complexity

Active Publication Date: 2016-05-25
深圳市极致汇仪科技有限公司
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Problems solved by technology

This approach relies on specific protocol signals and is often complex

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  • Detection method of wireless comprehensive testing instrument for IQ unbalance of single carrier QPSK signal
  • Detection method of wireless comprehensive testing instrument for IQ unbalance of single carrier QPSK signal
  • Detection method of wireless comprehensive testing instrument for IQ unbalance of single carrier QPSK signal

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0062] like Figure 8 Shown, a kind of wireless comprehensive measuring instrument is to the detection method of single-carrier QPSK signal IQ unbalance, comprises the following steps:

[0063] S1, carrier frequency offset correction;

[0064] S2, time synchronization;

[0065] S3, I, Q sampling judgment;

[0066] S4, DC bias correction;

[0067] S5, ask first quadrant coordinate average value;

[0068] S6. Find the amplitude and phase imbalance.

[0069] like Image 6 As shown, the receiving antenna signal is firstly filtered by the band-pass filter at the radio frequency end, adjusted by the low-noise amplifier and AGC (automatic gain control), and then the IQ two-way quadrature mixing is carried out, and then the I-way and the Q-way each carry out baseband low-frequency mixing. Pass filtering, that is, the LPF in the figure, removes t...

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Abstract

The invention provides a detection method of a wireless comprehensive testing instrument for IQ unbalance of a signal carrier QPSK signal. The detection method comprises the following steps of S1, carrying out carrier frequency offset correction; S2, carrying out time synchronization; S3, carrying out I and Q sampling judgment; S4, carrying out direct current offset correction; S5, obtaining a first quadrant coordinate mean value; and S6, obtaining amplitude and phase unbalance. The detection method of the wireless comprehensive testing instrument for IQ unbalance of the signal carrier QPSK signal has the beneficial effects that detection of the wireless comprehensive testing instrument for the IQ unbalance of the single carrier QPSK signal is realized without depending on a specific training sequence.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting IQ imbalance of a single carrier QPSK signal by a wireless comprehensive tester. Background technique [0002] Explanation of terms: [0003] DUT: DUT. [0004] QPSK: Quadrature Phase Shift Keying. [0005] DQPSK: Differential Quadrature Phase Shift Keying. [0006] IO: local oscillator. [0007] EVM: Error Vector Magnitude. [0008] AD: Analog-to-digital converter. [0009] DA: digital-to-analog converter. [0010] Zero-IF transmitters are also called direct up-conversion transmitters. Unlike superheterodyne transmitters, which require complex circuits with multiple stages of mixing and filtering, and are simple in structure and easy to integrate, they are widely used in DUT built-in chips. However, zero-IF transmitters have defects of local oscillator leakage and IQ imbalance. During production testing, it is necessary to measure the local oscillator leakage a...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04L27/38H04L27/00
CPCH04L27/0014H04L27/364H04L27/3827H04L2027/003
Inventor 吴帅刘海溶
Owner 深圳市极致汇仪科技有限公司
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