Method and apparatus for DC offset correction in zero intermediate frequency receiver

A technology of zero-IF receiver and DC bias, applied in the direction of DC level restoration device/bias distortion correction, baseband system components, electrical components, etc., can solve inaccurate problems

Inactive Publication Date: 2009-06-10
ZTE CORP
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Problems solved by technology

However, if the IQ data before the initial position estimation of the training sequence still has a large DC-OFFSET, the searched initial position of the training sequence will have a large deviation, resulting in an inaccurate DC-OFFSET value obtained by the joint estimation

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  • Method and apparatus for DC offset correction in zero intermediate frequency receiver
  • Method and apparatus for DC offset correction in zero intermediate frequency receiver
  • Method and apparatus for DC offset correction in zero intermediate frequency receiver

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Embodiment Construction

[0058] A device for DC-OFFSET correction of a zero-IF receiver according to the present invention is as follows: figure 1 shown. In addition to the receiving antenna, RF switch, ground, and zero-IF receiver, a main control unit and a baseband processing unit are added. Among them, the receiving antenna is used for receiving wireless signals; the zero-IF receiver converts the radio frequency signal into an analog baseband signal through a down-conversion, and realizes the analog-to-digital conversion of the baseband signal;

[0059] The RF switch is a single-pole double-throw switch, which is connected to the ground end during initial calibration, and to the receiver end during normal calibration;

[0060] The ground is used to short-circuit the input signal during the initial calibration;

[0061] The main control unit completes the control of the radio frequency switch and the baseband processing unit, and is used to turn the radio frequency switch to the ground terminal du...

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PUM

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Abstract

The invention relates to a method and a device for correcting the direct current offset of a zero intermediate frequency receiver. The method comprises the following steps: (a) estimating the initial DC-OFFSET before the zero intermediate frequency receiver is switched on with a radio frequency switch, and switching on the zero intermediate frequency receiver with the radio frequency switch to receive data after obtaining the initial DC-OFFSET estimated value; (b) making use of the initial DC-OFFSET estimated value to compensate the received data; (c) estimating the initial position of a training sequence for the received data after the compensation to obtain the offset of the actual position of the training sequence relative to an expected position; (d) performing channel impulse response and DC-OFFSET joint estimation to obtain a DC-OFFSET estimated value; and (e) making use of the DC-OFFSET estimated value to compensate the DC-OFFSET of the received data. The device comprises a main control unit and a baseband processing unit, wherein the main control unit controls the baseband processing unit to perform initial DC-OFFSET estimation, then receives data to perform initial DC-OFFSET compensation, and then performs the subsequent compensation.

Description

technical field [0001] The present invention relates to a DC-OFFSET (Direct Current Offset, DC offset) correction method and device for a zero-IF receiver, in particular to a DC-OFFSET correction method and device for a zero-IF receiver in the field of wireless communication. Background technique [0002] The zero-IF receiver converts the RF signal into a baseband signal through a frequency conversion. Compared with the traditional superheterodyne receiver, it does not need IF processing, image rejection filter and IF filter, which greatly simplifies the design of the receiver. The zero-IF receiver has the characteristics of small size, low cost and easy monolithic integration. It has become a very competitive structure in radio frequency receivers and has attracted extensive attention in the field of wireless communication. [0003] However, zero-IF receivers are facing many new technical challenges, such as receiving DC offset (DC-OFFSET), even-order distortion (Even-Order...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/06H04B1/707H04B1/30
Inventor 卢勤博杨锋张纲邰春玲
Owner ZTE CORP
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