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Method and device for IQ (intelligence quotient) signal real-time calibration

A signal and signal power technology, which is used in the field of real-time calibration of IQ signals, and can solve problems such as low calibration accuracy and inability to meet stray radiation requirements.

Inactive Publication Date: 2011-10-19
ZTE CORP
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Problems solved by technology

However, the calibration accuracy of the one-time calibration is low and the leakage power of the LO after calibration is very sensitive to environmental influences. When the base station transmitter works in a high-temperature or low-temperature environment, the one-time IQ calibration cannot meet the strict requirements for spurious radiation.

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  • Method and device for IQ (intelligence quotient) signal real-time calibration
  • Method and device for IQ (intelligence quotient) signal real-time calibration

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Embodiment Construction

[0024] Such as figure 1 As shown, the device for real-time calibration of IQ signals includes: a local oscillator leakage signal power estimation calculation module and an IQ signal calibration module.

[0025] The local oscillator leakage signal power estimation calculation module is used to calculate the local oscillator leakage signal power estimation of the base station transmission device according to the radio frequency signal output by the base station transmission device through the feedback link;

[0026] The IQ signal calibration module adjusts the value of the I signal DC compensation register and / or the value of the Q signal DC compensation register in the base station transmitting device until the local oscillator leakage signal power estimate is located at the local oscillator leakage power standard required by the base station transmitting device up to the interval. The IQ signal calibration module removes the gain effect of the feedback link according to the e...

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Abstract

The invention discloses a method and a device for IQ (intelligence quotient) signal real-time calibration and a device thereof. The method comprises the following steps: computing a local-oscillation leaked-signal power estimation value of a transmitting device of a base station by a feedback link according to a radio frequency signal output by the transmitting device of the base station; and adjusting a value of an I signal direct current compensation register and / or a value of a Q signal direct current compensation register until the local-oscillation leaked-signal power estimation value is within a local-oscillation leaked-signal power standard zone requested by the transmitting device of the base station. In the scheme, through introducing the feedback link, the real-time calibration of IQ signals can be realized, and the real-time and the accuracy of the local-oscillation leakage suppression can be improved.

Description

technical field [0001] The invention relates to the technical field of signal radio frequency transmission in the field of wireless communication, in particular to a method and device for real-time calibration of IQ signals. Background technique [0002] In the field of wireless communication, spatial spectrum interference is more complicated, especially for broadband base stations using digital pre-distortion technology, requiring the transmitter to output as few spurious signals as possible, so as to prevent the spurious effects of the transmitter from affecting the effect of digital pre-distortion. However, for a complex intermediate frequency system, due to the unbalanced DC level of the IQ modulator, local oscillator leakage will inevitably occur, resulting in large spurious interference. The usual way to deal with local oscillator leakage is to calibrate the DC bias of the IQ signal in the base station transmitter, and write the calibration parameters into the DC compe...

Claims

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Application Information

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IPC IPC(8): H04L25/06H04L25/02H04L25/03
CPCH04L27/3863
Inventor 蓝翱华周瑞兴
Owner ZTE CORP
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