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IQ (in-phase/quadrature-phase) imbalance correcting system and method for zero-intermediate-frequency architecture

A technology of balance correction and zero intermediate frequency, applied in the field of communication, can solve the problems affecting the performance of the receiver, unbalanced demodulation performance, and reduce the EVM value of the received signal, and achieve the effects of easy implementation, good real-time performance and simple structure

Active Publication Date: 2015-03-25
ALLWIN TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

IQ imbalance directly affects the demodulation performance of the receiver, reduces the EVM value of the received signal, and affects the performance of the receiver

Method used

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  • IQ (in-phase/quadrature-phase) imbalance correcting system and method for zero-intermediate-frequency architecture
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  • IQ (in-phase/quadrature-phase) imbalance correcting system and method for zero-intermediate-frequency architecture

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Embodiment Construction

[0043] For the understanding of the accompanying drawings and the description below, the following definitions are first given:

[0044] ADC (Analog-to-Digital Converter): Analog-to-Digital Converter;

[0045] DAC (Digital-to-Analog Converter): digital-to-analog converter;

[0046] LNA (Low-Noise Amplifier): low-noise amplifier;

[0047] FPGA (Field Programmable Gate Array): field programmable gate array;

[0048] ICS (Interference Cancellation System): interference cancellation system;

[0049] IQ (IN phase Orthogonal): In-phase quadrature;

[0050] FIFO (First In First Out): a first-in first-out data buffer;

[0051] DDC (Digital down converter): digital down conversion;

[0052] DUC (Digital Up Converter): digital up conversion;

[0053] LNA (Low Noise Amplifier): Low Noise Amplifier.

[0054] refer to figure 1 According to an aspect of the present invention, an IQ imbalance correction system for a zero-IF architecture is provided, including:

[0055] The amplitude...

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Abstract

The invention discloses an IQ (in-phase / quadrature-phase) imbalance correcting system for a zero-intermediate-frequency architecture, comprising an amplitude imbalance estimator, a phase imbalance estimator and a receiving part imbalance compensator. The invention also discloses an IQ imbalance correcting method for the zero-intermediate-frequency architecture, comprising the following steps of: A, estimating amplitude imbalance; B, estimating phase imbalance; and C, compensating receiving part imbalance. According to the invention, the current in-phase signal and quadrature-phase signal are utilized for calculating an amplitude imbalance factor and a phase imbalance factor, IQ imbalance correction is carried out on the current in-phase signal and quadrature-phase signal, an implementation method is simple, implementation is easy, and instantaneity is good. The IQ imbalance correcting system and method for the zero-intermediate-frequency architecture with good performance disclosed by the invention can be widely applied to the communication field.

Description

technical field [0001] The invention relates to the communication field, in particular to an IQ imbalance correction system and method of a zero-IF architecture. Background technique [0002] In the communication field, zero-IF architecture is very popular because of its simple structure, low power consumption, low cost and high integration. Its working principle is: the baseband analog signal is input to the IQ quadrature modulator through the I and Q channels, and the IQ quadrature modulator performs quadrature modulation on the I and Q signals, and transmits the quadrature modulation output signal. The above modulation is an analog operation process, and there will be gain and phase errors between I and Q signals, that is, IQ imbalance. The IQ imbalance directly affects the demodulation performance of the receiver, reduces the EVM value of the received signal, and affects the performance of the receiver. Contents of the invention [0003] In order to solve the above t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 郝禄国杨建坡潘继永谢晓东余嘉池曾文彬
Owner ALLWIN TELECOMM