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Method and device for correcting DC offset of a zero-IF receiver

A zero-IF receiver, DC bias technology, applied in DC level restoration device/bias distortion correction, shaping network in transmitter/receiver, baseband system components, etc., can solve problems such as inaccuracy

Inactive Publication Date: 2011-12-07
ZTE CORP
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AI Technical Summary

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 device for correcting DC offset of a zero-IF receiver
  • Method and device for correcting DC offset of a zero-IF receiver
  • Method and device for correcting DC offset of a zero-IF 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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Abstract

A method and device for correcting a DC offset of a zero-IF receiver, the method comprising the following steps: (a) before the zero-IF receiver is connected to a radio frequency switch, an initial DC offset DC-OFFSET is estimated to obtain an initial DC -After the estimated value of OFFSET, the zero-IF receiver is connected with the radio frequency switch and starts to receive data; (b) using the initial estimated value of DC-OFFSET to compensate the received data; (c) to compensate the received data Estimating the starting position of the training sequence to obtain the offset of the actual position of the training sequence relative to the expected position; (d) performing joint estimation of the channel impulse response and DC-OFFSET to obtain the estimated value of DC-OFFSET; (e) using the DC -OFFSET estimated value for DC-OFFSET compensation of received data. The device includes a main control unit and a baseband processing unit. The main control unit controls the baseband processing unit to first perform initial DC-OFFSET estimation, and then receive data to perform initial DC-OFFSET compensation before performing 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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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/06
Inventor 卢勤博杨锋张纲邰春玲
Owner ZTE CORP
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