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A Method for Restraining Image Interference in Wideband Receiver

A wideband receiver and image interference technology, applied in the transmission system, electrical components, etc., can solve the problems that are difficult to implement, unsuitable for wideband receivers, and difficult to solve the image interference of intermediate frequency signals, so as to achieve low design difficulty and wide application bandwidth Effect

Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] However, this is not suitable for wideband receivers. Due to the need to adapt to various communication frequency band standards, as the communication frequency band of the received signal changes, the image frequency band will also change accordingly.
Therefore, for relatively wide preselection filters and image rejection filters, it is very likely that the frequency band of the image signal is within the passband bandwidth, making it difficult to solve the problem of image interference in the IF signal, as shown in the attached Figure 4 shown
If an adjustable image rejection filter is used to make the passband of the filter change with the change of the communication standard frequency band, although it is a solution, the design of the adjustable filter is difficult and difficult to implement

Method used

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Embodiment Construction

[0025] It is known that the frequency of the input signal A is ω A , the center frequency of IF filter 1 is ω 1 , the center frequency of IF filter 2 is ω 2 , the center frequency of IF filter 3 is ω 3 , the frequency of the image interference signal B is ω B = ω A -2ω 1 , the frequency of the image interference signal C is ω C = ω A +2ω 2 , so we know that:

[0026] For the first channel, change the frequency ω of the local oscillator LO1 LO1 , making it equal to ω A -ω 1 , through subsequent signal processing, the intermediate frequency signal ω can be obtained 1 Signal at frequency Z 1 , which contains the desired signal and the image signal, so that (in frequency ω A , ω B , the system function of the output and input terminals when passing through channel 1);

[0027]The second channel, change the frequency ω of the local oscillator LO2 LO2 , making it equal to ω A +ω 2 , through subsequent signal processing, the intermediate frequency signal ω can b...

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Abstract

The invention discloses a method for suppressing image interference by a wideband receiver, and the method belongs to the technical field of mobile communication. In the prior art, for relatively wide preselection filters and image rejection filters, it is very likely that the frequency band of the image signal is within the passband bandwidth, making it difficult to solve the problem of image interference in the intermediate frequency signal. Compared with the traditional The method for suppressing image interference using a filter with adjustable center frequency, the present invention does not directly eliminate the image interference signal, but jointly calculates each target signal through the signals of three frequency conversion channels, so the present invention has low design difficulty and wide application bandwidth wide advantage.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and is a method applicable to broadband receivers for suppressing image interference. Background technique [0002] In recent years, wireless communication technology has developed rapidly, such as the attached figure 1 As shown, it is the frequency bands occupied by major domestic communication operators and different communication standards. For long-distance wireless communication, there are GSM and CDMA technologies for 2G communication, WCDMA and TD-SCDMA technologies for 3G communication, and LTE technology for 4G communication; for indoor short-distance communication, there are Zigbee and Bluetooth communication standards. Therefore, different application scenarios and coverage areas require different communication standards. At present, the world has entered the sprint stage of 5G communication commercialization indicators, and countries have successively planned 5G spectru...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/12
CPCH04B1/10H04B1/12
Inventor 游飞游冠雄王朋徐茂加
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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