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Method and device for correcting wireless local area network (WLAN) chip transmitter local oscillator (LO) leakage

A wireless local area network and local oscillator leakage technology, applied in the field of digital communication, can solve the problems of difficult to guarantee accuracy and high cost

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

AI Technical Summary

Problems solved by technology

The disadvantage of static calibration is that if the production test is carried out for each chip, the cost is high; if the same calibration value is used for a batch of chips, then the accuracy is difficult to guarantee
The bigger problem is that LO leakage is not fixed, it may change with time, power supply voltage, temperature and other external conditions, which means that dynamic DC calibration method is needed to compensate LO leakage

Method used

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  • Method and device for correcting wireless local area network (WLAN) chip transmitter local oscillator (LO) leakage
  • Method and device for correcting wireless local area network (WLAN) chip transmitter local oscillator (LO) leakage
  • Method and device for correcting wireless local area network (WLAN) chip transmitter local oscillator (LO) leakage

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Experimental program
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Embodiment Construction

[0024] In the present invention, a single-frequency signal is used, which is divided into I / Q two-way, as follows:

[0025] V bb (t)=Acos(ω BB t)+j*Asin(ω BB t)

[0026] After the ideal single-frequency signal is up-converted, the modulated signal is:

[0027] V rf (t)=Acos(ω BB t)cos(ω RF t)-Asin(ω BB t)sin(ω RF t)

[0028] When the I / Q two channels have DC bias I dc and Q dc , then the modulated signal is:

[0029] V rf (t)=Acos(ω DD t)cos(ω RF t)-Asm(ω DD t)sin(ω RF t)+I dc cos(ω RF t)-Q dc sin(ω RF t)

[0030] After passing through the envelope detector and low-pass filter, the output signal is as follows:

[0031] I in = ( AI dc cos ω BB + AQ dc sin ω ...

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Abstract

The invention provides a method and device for correcting wireless local area network (WLAN) chip radio-frequency transmitter LO leakage. The device is formed by an analog compensation circuit and digital LO leakage estimation and correction. In order to eliminate the LO leakage introduced by a radio-frequency circuit at a transmitter and enable emitting signals to be accord with the frequency spectrum requirement of a WLAN protocol, the device is added with the compensation circuit at the radio frequency portion; then the deviation values of I / Q two paths of signals are estimated through a digital one-dimensional scanning method; and the estimation results are written into the compensation circuit of the radio frequency portion, thereby realizing the correction of the LO leakage of the transmitter.

Description

Technical field: [0001] A method and device for correcting LO leakage of a wireless local area network chip transmitter, which belongs to the field of digital communication technology, improves the performance of the transmitter by correcting the LO leakage of the transmitter, avoids the introduction of DC deviation to the receiver, and also makes the transmitter The signal meets the WLAN protocol spectrum requirements. Background technique: [0002] The wireless local area network uses the quadrature modulation method for communication. The signal is directly up-converted from the baseband to 2.4GHz or higher, and the receiving end is directly down-converted to zero intermediate frequency. Zero-IF communication has no IF signal, and I / Q signals can be directly collected by ADC and processed in baseband. At the same time, zero-IF communication removes a lot of external components, the structure is simple, and the cost is also reduced. However, there is a very difficult DC dr...

Claims

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Application Information

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IPC IPC(8): H04L25/06H04B1/04
Inventor 邬泳邹锦芝
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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