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Amending method and amending system directing at unbalanced zero intermediate frequency feedback

A zero-IF and balanced technology, applied in the field of zero-IF feedback imbalance, can solve problems such as ineffective effects, inaccurate I/Q signals, and zero-IF feedback imbalance

Active Publication Date: 2013-01-16
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0007] The technical problem to be solved in this application is to provide a correction method and system for zero-IF feedback imbalance, so as to solve the problem that the existing correction method has no obvious effect and the obtained I / Q signal is inaccurate

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  • Amending method and amending system directing at unbalanced zero intermediate frequency feedback
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  • Amending method and amending system directing at unbalanced zero intermediate frequency feedback

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Embodiment Construction

[0088] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0089] This application first samples the zero-IF signal fed back by the DPD feedback channel, then performs statistics and corrections on the sampled signals for the three situations of DC leakage, amplitude imbalance and phase imbalance, and finally performs correction on the corrected signal The digital pre-distortion coefficient is updated, so that the obtained I signal and Q signal to be sent are more accurate.

[0090] Such as figure 2 As shown, it is an overall structure diagram of adopting zero-IF quadrature feedback and correcting feedback imbalance in the DPD feedback channel.

[0091] First, briefly introduce the overall process of signal feedback:

[0092] from figure 2 It can be seen th...

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Abstract

The invention provides an amending method and an amending system directing at an unbalanced zero intermediate frequency feedback, and the amending method and the amending system are used for solving the problems of unobvious effect of the existing amending method and inexact I / Q signal. The method comprises the following steps: sampling a zero intermediate frequency feedback signal, wherein the zero intermediate frequency feedback signal comprises an I signal and a Q signal; respectively counting direct current leakage volumes of the I signal and the Q signal, and performing the direct current amending treatment on the I signal and the Q signal according to the direct current leakage volumes; counting an amplitude ratio of the I signal and the Q signal after the direct current amendment, and performing amplitude amending treatment on the I signal and the Q signal after performing the direct current amendment according to the amplitude ratio; counting a phase position difference between the I signal and the Q signal after amending the phase position, and performing phase position amending treatment on the I signal and the Q signal after performing the amplitude amendment according to the phase position difference; and performing digital distortion factor updating treatment on the I signal and the Q signal after performing the I signal and the Q signal to obtain the I signal and the Q signal to be sent. With the adoption of the amending method and the amending system, the obtained I signal and the Q signal to be sent are more exact.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a correction method and system for zero-IF feedback imbalance. Background technique [0002] The analog-to-digital converter (Analog-to-Digital Converter, ADC) in the digital pre-distortion (Digital Pre-Distortion, DPD) feedback channel is used to collect the received radio frequency signal, and the performance of ADC sampling is determined by the sampling rate, according to Nai According to Quest's theorem, the sampling rate should be at least twice the bandwidth of the sampled signal, so that the collected signal will not be aliased and can completely reflect the RF signal before sampling. When the system performs digital pre-distortion processing, the extended bandwidth should be P times the signal bandwidth. Therefore, when the ADC performs sampling for the extended bandwidth, the sampling rate of the ADC should be greater than or equal to twice the exten...

Claims

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Application Information

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IPC IPC(8): H04L25/49
Inventor 熊军王策王杰丽杨柳肖鹏
Owner DATANG MOBILE COMM EQUIP CO LTD
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