Device and method for receiving wireless signals

Abstract

The invention discloses a device and a method for receiving wireless signals, which can receive at least three signals with different center frequencies. The embodiment of the device comprises a receiving circuit, a mixing circuit and a digital signal producing circuit. The receiving circuit is used for producing a receiving signal according to a wireless signal. The wireless signal comprises a first wireless signal, a second wireless signal and a third wireless signal, which have different center frequencies. The mixing circuit is used for processing the receiving signal according to a local oscillation frequency so as to produce a mixing signal. The mixing signal comprises a first if signal, a second if signal and a third if signal. The center frequency of the third if signal is greater than the center frequencies of the first if signal and the second if signal. The digital signal producing circuit is used for respectively processing the first if signal, the second if signal and the third if signal according to a sampling frequency so as to produce a first digital signal, a second digital signal and a third digital signal. The sampling frequency is less than the highest frequency of the third if signal by two times.

Description

technical field [0001] The present invention relates to a signal receiving device and method, in particular to a wireless signal receiving device and method. Background technique [0002] When the signal is processed in the circuit, it usually has a lower frequency to facilitate processing and save power consumption. However, when it is transmitted wirelessly, it has a higher frequency to avoid transmission loss. Therefore, the low-frequency fundamental frequency signal will be transmitted by the radio frequency circuit first. It is converted into a high-frequency radio frequency signal for wireless transmission, and the high-frequency radio frequency signal is converted into a low-frequency baseband signal by the radio frequency circuit for processing. Taking the reception of satellite positioning signals as an example, the frequency of common satellite positioning signals is mostly above 1.5GHz. After the satellite positioning signal is received by the radio frequency circ...

AI Technical Summary

Problems solved by technology

According to the Nyquist theorem, the sampling frequency must be greater than twice the highest frequency of the sampled signal to reconstruct the waveform of the sampled signal, otherwise the sampling result will produce aliasing (Aliasing), that is, the sampling result will correspond to an image The frequency is not the frequency corresponding to the signal to be sampled. However, the higher the sampling frequency, the greater the demand for the performance and power consumption of the analog-to-digital converter, and it also means higher cost.

Images