I/Q unbalance correction method and device used for wireless local area network device

A wireless local area network, balance correction technology, applied to the shaping network, baseband system components, multi-frequency code system and other directions in the transmitter/receiver, can solve the problems affecting the dynamic range and receiving performance of the quadrature receiver.

Active Publication Date: 2014-07-09
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the amplitude-phase mismatch of the in-phase and quadrature branches affects the dynamic range and receiving performance of the quadrature receiver, the present invention adopts a

Method used

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  • I/Q unbalance correction method and device used for wireless local area network device
  • I/Q unbalance correction method and device used for wireless local area network device
  • I/Q unbalance correction method and device used for wireless local area network device

Examples

Experimental program
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Example Embodiment

[0019] Transmitter IQ imbalance model:

[0020] The transmitted baseband complex signal can be expressed as:

[0021] v bb (t)=I(t)+jQ(t)

[0022] Assuming that there is no DC bias, the output signal after passing through the mixer can be expressed as:

[0023]

[0024]

[0025]

[0026] Gain is the transmitter IQ amplitude imbalance coefficient;

[0027] Is the transmitter IQ phase imbalance coefficient;

[0028] Therefore, the corresponding IQ mismatch baseband signal is:

[0029]

[0030]

[0031] The following transmitter correction models can be used to correct baseband signals with transmitter IQ mismatch:

[0032]

[0033]

[0034] Receiver IQ imbalance model:

[0035] The signal received by the radio frequency can be expressed as:

[0036] v rf (t)=I(t)cos(ω RF t)-Q(t)sin(ω RF t)

[0037] Assuming that there is no DC offset, after the down-conversion and low-pass filter, the baseband signal with IQ mismatch can be expressed as:

[0038]

[0039]

[0040]

[0041]

[0042] Gain is...

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Abstract

The invention provides an I/Q unbalance correction method and device used for a wireless local area network device. The device is formed by transmitter I/Q unbalance estimation and correction and receiver I/Q unbalance estimation and correction. In order to obtain the I/Q amplitude mismatch and phase mismatch coefficients of a transmitter and a receiver, the device estimates mismatch parameters through a one-dimensional scanning method firstly, and then, inputs baseband signals to an amplitude and phase unbalance correction module based on the estimated mismatch parameters, and thus mismatch errors are corrected.

Description

technical field [0001] An IQ unbalance correction method and device for wireless local area network equipment, which belong to the technical field of digital communication, and relate to correcting the IQ unbalance of a wireless local area network equipment transmitter and receiver. Background technique [0002] The wireless communication system usually adopts the way of quadrature modulation and demodulation, that is, the complex signal is divided into two channels of IQ with the same amplitude and orthogonal phase for processing. When the phase difference between the in-phase (I) and quadrature-phase (Q) local mixer signals is not exactly 90 degrees, then the IQ phase mismatch occurs. The amplitude mismatch of the two IQ channels is caused by inconsistencies in the mixers, filters, and analog-to-digital / digital-to-analog converters. The IQ amplitude and phase mismatch of the transmitter and the IQ amplitude and phase mismatch of the receiver will generate image signals, r...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
Inventor 邹锦芝邬泳
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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