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
CN101453435AInactive Publication Date: 2009-06-10ZTE CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ZTE CORP
Publication Date
2009-06-10
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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