Anti-interference receiving circuit structure, method and device

Abstract

The invention provides an anti-interference receiving circuit structure and method. A power detection module and a power control module are connected between a filter and an amplifier. The power detection module is used for detecting the power of an input signal. The power control module is used for storing a preset power threshold value, and judging whether the detection result of the power of the input signal exceeds the preset power threshold value or not, and carrying out the corresponding power attenuation processing of the power of the input signal. The structure and method can detect a strong interference signal, avoid the amplifier saturation or nonlinear distortion through the attenuation of strong interference power, improve the capability of a receiver for resisting strong signal interference, and guarantees the normal receiving under the strong interference.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an anti-interference receiving circuit structure, method and device. Background technique [0002] Blocking interference means that when the interference signal exceeds the maximum power level that the receiver can withstand, the receiver will be saturated, the receiving demodulation ability will be reduced, and even the normal reception will not be possible. Blocking interference is the most serious interference in wireless communication systems, affecting the dynamic range of the receiver. Blocking interference can be divided into blocking interference in the radio frequency band and blocking interference outside the radio frequency band. As the utilization rate of wireless spectrum becomes higher and higher, the interval between adjacent frequency bands is very close, especially in the time division duplex system. 10MHz, the transmitting frequency point falls w...

AI Technical Summary

Problems solved by technology

[0004] The existing technology uses radio frequency filters to filter strong signal blocking interference. The disadvantages are: 1. The strong signal blocking interference ability within the receiving bandwidth is weak; 2. The saturation distortion of the radio frequency front end caused by strong signal interference and the blocking caused by the decline of demodulation ability cannot be eliminated. Problem; 3. At the same time, strong signal interference cannot be improved, resulting in a decrease in anti-intermodulation capability, and system linearity cannot be improved; 4. In addition, the hysteresis of IF AGC control cannot improve the strong signal blocking of the first frame; 5. IF The power detection and gain control of AGC control have the problem of closed-loop cycle oscillation

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