Frequency band reconfigurable radio frequency receiver front end for multi-standard communication

Abstract

The invention provides a frequency band reconfigurable radio frequency receiver front end for multi-standard communication, and the receiver comprises a receiving module, in the receiving module, a low-noise amplifier receives a radio frequency signal, and carries out the low-noise amplification of the received radio frequency signal; the radio frequency switch is used for selecting a communication frequency band channel and inputting the radio frequency signal subjected to low-noise amplification into the radio frequency filter corresponding to the selected communication frequency band channel for radio frequency filtering; the radio frequency signal subjected to radio frequency filtering and a first local oscillator signal are input into a first-stage frequency converter for down-conversion, and an intermediate frequency signal is obtained; the intermediate-frequency signal is filtered and amplified through an intermediate-frequency filter and a power amplifier respectively; inputting the filtered and amplified intermediate frequency signal and the second local oscillator signal into a demodulator for demodulation to obtain a baseband I / Q signal; a baseband I / Q signal is subjected to gain control and low-pass filtering control through a variable gain amplifier and a baseband programmable filter. The method is suitable for Wi-Fi and 5G communication, has reconfigurability, and is suitable for various communication scenes.

Description

technical field [0001] The present application relates to the field of radio frequency technology, and in particular to a frequency band reconfigurable radio frequency receiver front end for multi-standard communication. Background technique [0002] With the rapid development of technology and society, 3G and 4G communication can no longer meet the needs of human beings. As a new mobile communication technology, 5G communication technology has become an inevitable trend to replace 3G and 4G technology. 5G communication technology itself has great advantages, especially in data transmission. The bandwidth provided by 5G technology can meet the needs of most people, help users get a better sense of experience, and improve communication rates. At present, the application of 5G and WLAN is becoming more and more common. [0003] At present, most of the radio frequency receivers used in wireless communication systems adopt the structure of superheterodyne receiver. Compared wi...

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Problems solved by technology

like figure 1 As shown, the applicable frequency bands of the existing superheterodyne receivers are relatively single, and the structure is relatively fixed, which cannot be applied to multi-mode communication and has limitations.

In addition, the bandwidth of the traditional superheterodyne receiver is non-adjustable and fixed, but the bandwidth required by different current communication standards is different, which leads to the use of a receiver with a smaller receiving bandwidth that will affect the communication rate

Moreover, the local oscillator frequency of the traditional superheterodyne receiver is not adjustable or the adjustable range is too small, and it is difficult to apply to different communication modes

In addition, traditional superheterodyne receivers are also greatly affected by image interference

At present, there are a variety of communication standards (such as WLAN and 5G communication standards, etc.), and the requirements for system flexibility and reconfigurability are getting higher and higher. Traditional superheterodyne receivers can no longer meet today's high-speed, high-flexibility requirements. Degree, high selectivity and software-based usage requirements

[0005] To sum up, due to the rapid development of communication, traditional wireless transceivers can no longer meet the future communication needs. How to provide a high-speed, high-flexibility and reconfigurable wireless receiver for multi-standard communication is an important issue. unresolved issues

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