A receiver and communication device

Abstract

The present application discloses a receiver and a communication device. The receiver includes a first path and a second path. The first path is used to receive a radio frequency signal and generate a baseband signal according to the radio frequency signal. The radio frequency signal includes a useful signal and at least two an interfering signal, and the baseband signal includes a difference frequency signal between at least two interfering signals; the second path is used for receiving the radio frequency signal, and determines whether to attenuate the radio frequency signal received by the second path according to the control signal, so as to reduce The signal strength of the interference signal in the second path, and the control signal are determined according to the signal strength of the baseband signal generated by the first path. Through the above method, the present application can improve the second-order intermodulation intercept point of the receiver, enhance the anti-interference ability, and reduce the impact on the sensitivity of the receiver.

Description

technical field [0001] The present application relates to the technical field of communication, and in particular to a receiver and a communication device. Background technique [0002] In modern receivers, zero intermediate frequency (ZIF, Zero Intermediate Frequency) architecture has many advantages, such as high integration, low cost and simpler circuit structure. Even so, it still has some serious problems, among which poor immunity to interference is a major factor hindering the large-scale application of receivers with this architecture. More specifically, for interference like two-tones that exist in-band, due to the inherent structure of zero-IF receivers, low-frequency interference signals will be generated at baseband. [0003] The inventor of the present application has found in the long-term research and development that the solution of adding an attenuator directly before the mixer can be adopted in the prior art, and the solution is achieved by adding an atten...

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Problems solved by technology

[0003] The inventor of the present application has found in the long-term research and development that the solution of adding an attenuator directly before the mixer can be adopted in the prior art, and the solution is achieved by adding an attenuator directly before the mixer (before or after the low noise amplifier). Improve the second-order intermodulation intercept point (IP2, Second-order Input Intercept Point) index; the disadvantage is that the sensitivity of the system is reduced, which will seriously affect the communication quality when the useful signal is weak

In addition, you can also use the figure 1 In the technical solution shown, the main signal is compensated through the second signal path, and a compensation signal is generated by the second signal path, and a calibration signal is superimposed on the main signal, thereby eliminating the interference of the baseband; the disadvantages of this technology It is necessary to dynamically adjust the parameters of the variable gain amplifier (VGA, Variable Gain Amplifier) ​​to make the calibration signal effective in real time, which will consume a lot of resources and require higher computing power for digital signal processing (DSP, Digital Signal Processing)

In addition, the implementation of the control algorithm is also difficult, and a bad algorithm will have a great impact on the anti-interference performance

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