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DC maladjustment eliminating method and device in wireless receiving system

A technology of DC offset and wireless reception, applied in transmission systems, electrical components, etc., can solve the problems of high cost, long signal response time, affecting the performance of communication systems, etc., to shorten the consumption time and avoid the long time to eliminate DC offset. Effect

Inactive Publication Date: 2008-02-13
BEIJING LHWT MICROELECTRONICS
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Problems solved by technology

Among them, the digital calibration method requires relatively high-performance analog circuits and complex digital signal processing algorithms, so it is difficult to implement and the cost is high
In order not to affect the frequency spectrum of the signal as much as possible, the existing AC coupling and feedback calibration methods use a lower corner frequency to filter the received frequency signal; the signal response time is longer due to the lower corner frequency , unable to meet the requirements of some high-performance communication system standards, thereby affecting the performance of the communication system

Method used

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  • DC maladjustment eliminating method and device in wireless receiving system
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  • DC maladjustment eliminating method and device in wireless receiving system

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Embodiment Construction

[0028] In the present invention, the AC coupling technology is used to eliminate the DC offset. AC coupling is actually high-pass filtering. In order to shorten the response time, the core of the present invention is to use a high-pass filter with multiple corner frequencies to eliminate the DC offset. Specifically, the magnitude of the corner frequency of the high-pass filter is switched in turn to achieve rapid elimination of DC offset.

[0029] The specific implementation of the method of the present invention is as shown in Figure 1, specifically includes:

[0030] Step 11: Set several corner frequencies of different sizes for the high-pass filter that performs DC offset elimination processing on the frequency signal, and the specific value of the corner frequency needs to be determined according to the frequency characteristics of the frequency signal;

[0031] For example, it can be set that the corner frequencies of the high-pass filter are ω1, ω2, and ω3 in descendin...

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Abstract

The invention relates to an ac coupling method to eliminate dc mistuning with a high-pass filter with multiple corner frequencies in wireless receive system. Wherein, for proper time point, switching the corner frequency of said filter from high to low to eliminate the dc component in signal. This invention cuts time consumption greatly, and satisfies well the standard in high-performance communication system.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method, device and system for eliminating DC imbalance in a wireless receiving system. Background technique [0002] With the rapid development of integrated circuit technology, it is possible to highly integrate the wireless transceiver system. Moreover, a wireless transceiver with a direct conversion structure (or called a zero-IF wireless transceiver) has become a mainstream and an inevitable choice in the design of integrated circuits for transceiver systems. However, the most important problem encountered in the design of zero-IF wireless transceiver is the problem of DC offset. [0003] The DC offset refers to the influence of noise, self-mixing phenomenon or the introduction of a DC component due to the mismatch of the receiver itself. The introduction of the DC component will cause a large gap between the received signal and the expected received...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/30
Inventor 王海永吴南健许佐海杨媛杨军寿国梁陈杰
Owner BEIJING LHWT MICROELECTRONICS
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