Receiving method and receiver for third-order intermodulation suppression and elimination of DC bias component

Abstract

The invention discloses a third-order intermodulation-suppression and direct current offset component-elimination receiving method. The method includes the following steps that: radio frequency signals are received through an antenna; the radio frequency signals are amplified through a low-noise amplifier; radio frequency signals generated by a frequency synthesizer are inputted into a phase controller, and the phase of the phase controller is cyclically switched among 0 degree, 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees and 315 degrees; the received signals and the generated signals are mixed, and radio frequency signals are filtered out, so that zero-intermediate frequency component signals can be obtained; the zero-intermediate frequency component signals are converted by a digital-to-analog converter, so that eight components can be obtained; and an in-phase component and a quadrature component are obtained by using given formulas. According to the third-order intermodulation-suppression and direct current offset component-elimination receiving method of the invention, the eight specified different phases are adopted, so that eight sequential signals are obtained; operation is performed on the eight sequential signals with the computing formulas, so that the pure in-phase component I and quadrature component Q can be obtained; and therefore, the anti-interference ability of the receiver can be effectively improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a receiving method and a receiver for suppressing third-order intermodulation and eliminating DC bias components. 【Background technique】 [0002] With the rapid development of wireless communication systems, receivers are widely and large-scale used, such as various mobile terminals. Because mobile terminals are sensitive to price on the one hand and limited in power on the other hand, zero-IF receiver solutions are widely used. Compared with the traditional superheterodyne receiver, the number of components of the zero-IF receiver solution is greatly reduced, the integration degree is greatly improved, and the cost is greatly reduced. However, zero-IF receivers have various inherent shortcomings, such as local oscillator leakage, DC offset, intermodulation interference, etc. If these negative effects are not effectively removed, their performance in...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a receiving method and receiver for third-order intermodulation suppression and elimination of DC offset components, so as to solve the problem of not removing DC offset and third-order intermodulation components in existing receivers

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