Unlock instant, AI-driven research and patent intelligence for your innovation.

IQ unbalance correction method and device for wireless local area network equipment

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

Active Publication Date: 2017-07-11
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • 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 of estimating the amplitude-phase mismatch parameters through one-dimensional scanning and then inputting the baseband signal based on the mismatch The method of processing the parameter imbalance correction module

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • IQ unbalance correction method and device for wireless local area network equipment
  • IQ unbalance correction method and device for wireless local area network equipment
  • IQ unbalance correction method and device for wireless local area network equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[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 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-mismatched baseband signal is:

[0029]

[0030]

[0031] The baseband signal for transmitter IQ mismatch can be corrected by the following transmitter correction model:

[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 bias, after down-conversion and low-pass filter, the baseband signal with IQ mismatch can be expressed as:

[0038]

[0039]

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method and a device for correcting IQ imbalance in wireless local area network equipment. The device is composed of transmitter IQ imbalance estimation and correction and receiver IQ imbalance estimation and correction. In order to obtain the IQ amplitude mismatch and phase mismatch coefficients of the transmitter and the receiver, the device first estimates the mismatch parameters through a one-dimensional scanning method, and then inputs the baseband signal to the amplitude-phase mismatch coefficient based on the estimated mismatch parameters. In the balance correction module, the mismatch error is 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 邹锦芝邬泳
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD