Zero intermediate frequency receiver and direct current leakage suppression method thereof

A zero-IF receiver, DC leakage technology, applied in the direction of DC level restoration device/bias distortion correction, baseband system components, electrical components, etc., can solve the problems affecting LTE small signal band spurious indicators, etc. Simple, effective, real-time effects

Inactive Publication Date: 2013-05-08
COMBA TELECOM SYST CHINA LTD
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  • Claims
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Problems solved by technology

In addition, the DC leakage problem will also affect the LTE small signal in-band spurious index
[0003] The zero-IF modulator in the uplink of the zero-IF receiver

Method used

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  • Zero intermediate frequency receiver and direct current leakage suppression method thereof
  • Zero intermediate frequency receiver and direct current leakage suppression method thereof
  • Zero intermediate frequency receiver and direct current leakage suppression method thereof

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[0037] The essence of suppressing DC leakage corrects DC leakage. In the embodiment of the present invention, after the zero-IF modulator has performed DC leakage correction on the signal, a simple method is used to perform another DC leakage correction on the signal. The present invention will be explained in detail below with reference to the drawings and specific embodiments.

[0038] The DC leakage suppression method of the zero-IF receiver in the embodiment of the present invention, such as figure 1 Shown, including steps:

[0039] Step 1. Receive and capture I / Q (In-phase / Quadrature) data output by the analog-to-digital conversion chip;

[0040] Step 2. Add and average the captured data of channel I to obtain the DC correction difference of the data of channel I. At the same time, perform the addition and average calculation of the captured data of channel Q to obtain the DC correction of channel Q data Difference

[0041] Step 3. Subtract the DC correction difference of the I...

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Abstract

The invention discloses a zero intermediate frequency receiver and a direct current leakage suppression method thereof. The zero intermediate frequency receiver direct current leakage suppression method includes: respectively grabbing I route data and Q route data output by a digital-to-analogue conversion (DAC) chip, then respectively computing weighted average values of the grabbed I route data and Q route data to obtain direct current leakage rectifying differences of the I route and the Q route, subtracting respective direct current leakage rectifying differences from the received I route data and Q route data, and namely finishing direct current leakage rectifying of the I/Q data. The rectifying difference values are calculated according to received data in real time and the real-time received data is rectified according to the rectifying difference values, so that the zero intermediate frequency receiver and the direct current leakage suppression method thereof are strong in real time, and the rectifying method is simple and effective.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a zero-IF receiver and a DC leakage suppression method thereof. Background technique [0002] The zero-IF receiver has the advantages of small size, low cost, and easy monolithic integration. It has become a very competitive structure in radio frequency receivers and has received extensive attention in the field of wireless communication. However, the problem of DC leakage has become a limitation for zero-IF receivers. Barriers to the application of IF receivers. DC leakage directly affects signal demodulation, especially for WCDMA and CDMA2000 signal demodulation. In addition, the DC leakage problem will also affect the spurious indicators in the LTE small signal band. [0003] The zero-IF modulator in the uplink of the zero-IF receiver has a DC leakage suppression function, but it can only suppress the DC leakage to about -40dbm, which is far from the upstream ...

Claims

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Application Information

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IPC IPC(8): H04B1/30H04L25/06
Inventor 龚贺张嘉鹏
Owner COMBA TELECOM SYST CHINA LTD
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