Front-end anti-interference system of radio frequency receiver

Abstract

The invention discloses a front-end anti-interference system of a radio frequency receiver, and relates to the field of radio frequency anti-interference. The system comprises a power divider used for dividing a received antenna signal into a first low-frequency signal and a first high-frequency signal; the low-frequency signal processing module is used for receiving and preprocessing the first low-frequency signal and then outputting a third intermediate-frequency signal; the high-frequency signal processing module is used for receiving and preprocessing the first high-frequency signal and then outputting a fourth intermediate-frequency signal; and the combiner is used for receiving the third intermediate-frequency signal and the fourth intermediate-frequency signal and combining the signals into one path for output. Compared with the prior art, the preprocessing processes of the low-frequency signal and the high-frequency signal do not interfere with each other, the sensitivity and the anti-interference capability of the radio frequency receiver are improved, the frequency band range of the radio frequency signal preprocessed at the front end of the radio frequency receiver is enlarged, and feeder lines are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency anti-interference, and more specifically, to a radio frequency receiver front-end anti-interference system. Background Art

[0002] With the rapid development of modern electronic technology and wireless communication technology, wireless communication is increasingly being used. RF receivers receive signals based on wireless communication technology. The front end of the RF receiver is used to pre-process the RF signal received by the RF receiver. It filters out interference signals from the received signal, extracts useful signals, and enhances the strength of useful signals to facilitate subsequent demodulation of the signal. The front end of the RF receiver has an important influence on the sensitivity and anti-interference ability of the RF receiver. However, some existing RF receiver front ends can only pre-process low-frequency signals or high-frequency signals, and their signal processing range is relatively limited. Summary of the invention

[0003] In order to overcome the defect of the signal processing range limitation described in the above prior art, the present invention provides a radio frequency receiver front-end anti-interference system.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] A radio frequency receiver front-end anti-interference system, comprising:

[0006] A power divider, used to divide the received antenna signal into a first low-frequency signal and a first high-frequency signal;

[0007] A low frequency signal processing module, used for receiving the first low frequency signal and outputting a third intermediate frequency signal after pre-processing;

[0008] A high frequency signal processing module, used for receiving the first high frequency signal and outputting a fourth intermediate frequency signal after preprocessing;

[0009] The combiner is used to receive the third intermediate frequency signal and the fourth intermediate frequency signal, and combine them into one output.

[0010] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0011] The present invention uses a power divider to distribute the signal received by the external signal receiving antenna to a low-frequency signal processing module and a high-frequency signal processing module, and respectively uses the low-frequency signal processing module and the high-frequency signal processing module to pre-process the low-frequency signal and the high-frequency signal, so that the pre-processing processes of the low-frequency signal and the high-frequency signal do not interfere with each other, extract useful signals from the low-frequency signal and the high-frequency signal, improve the sensitivity and anti-interference ability of the radio frequency receiver, and increase the frequency band range of the radio frequency signal pre-processed by the front end of the radio frequency receiver. In addition, the present invention uses a combiner to combine the low-frequency signal and the high-frequency signal into one output, saving feeder lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the radio frequency receiver front-end anti-interference system described in the embodiment of the present application;

[0013] Figure 2 It is another structural schematic diagram of the radio frequency receiver front-end anti-interference system described in the embodiment of the present application;

[0014] The reference numerals are as follows:

[0015] 2003- low frequency preselection module; 4005- first frequency conversion module; 6007- first low frequency processing module; 1516- third frequency conversion module; 1718- second low frequency processing module;

[0016] 1314-high frequency preselection module; 1112-second frequency conversion module, 1009-first high frequency processing module, 1922 fourth frequency conversion module; 2021-second high frequency processing module;

[0017] 1-power divider; 2-low-pass filter; 3-first low-noise amplifier; 4-first mixer; 5-first local oscillator; 6-first filter; 7-first amplifier; 8-combiner; 9-second amplifier; 10-second filter; 11-second mixer; 12-second local oscillator; 13-high-pass filter; 14-attenuator; 15-third mixer; 16-third local oscillator; 17-third amplifier; 18-third filter; 19-fourth mixer; 20-fourth amplifier; 21-fourth filter; 22-fourth local oscillator. DETAILED DESCRIPTION

[0018] The terms "first", "second" etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged in appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes in the embodiments of the present application when describing. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment containing a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment. The term "determine" broadly covers a variety of actions, which may include obtaining, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database or other data structure), ascertaining, and similar actions, and may also include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and similar actions, and may also include generating, creating, establishing and similar actions, as well as parsing, selecting, choosing and similar actions, etc. The relevant definitions of other terms will be given in the following description.

[0019] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0020] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0021] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0022] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] As described in the background art, the existing RF receiver front end can only pre-process a single type of signal (low-frequency signal or high-frequency signal), and has the problem of a relatively limited signal processing range.

[0025] This embodiment provides a radio frequency receiver front-end anti-interference system. Figure 1 ,include:

[0026] A power divider 1, used for dividing the received antenna signal into a first low-frequency signal and a first high-frequency signal;

[0027] A low frequency signal processing module, used for receiving the first low frequency signal and outputting a third intermediate frequency signal after pre-processing;

[0028] A high frequency signal processing module, used for receiving the first high frequency signal and outputting a fourth intermediate frequency signal after preprocessing;

[0029] The combiner 8 is used to receive the third intermediate frequency signal and the fourth intermediate frequency signal, and combine them into one output.

[0030] In the above embodiment, the power divider 1 is used to evenly distribute the signal received by the external signal receiving antenna to the low-frequency signal processing module and the high-frequency signal processing module, and the low-frequency signal processing module and the high-frequency signal processing module are used to pre-process the first low-frequency signal and the first high-frequency signal, respectively, so that the pre-processing processes of the first low-frequency signal and the first high-frequency signal do not interfere with each other, and the interference signals in the first low-frequency signal and the first high-frequency signal are filtered out respectively, so as to extract the useful signals in the first low-frequency signal and the first high-frequency signal. Compared with the prior art, while improving the sensitivity and anti-interference ability of the RF receiver, the frequency band range of the RF signal pre-processed by the front end of the RF receiver is increased; in addition, in the above embodiment, the combiner 8 is used to combine the low-frequency signal and the high-frequency signal into one output, saving the feeder.

[0031] In some preferred embodiments, the low-frequency signal processing module includes a low-frequency pre-selection module 2003, a first frequency conversion module 4005, a first low-frequency processing module 6007, a third frequency conversion module 1516 and a second low-frequency processing module 1718 connected in sequence; wherein the low-frequency pre-selection module 2003 is connected to the power divider 1 to receive the first low-frequency signal, and the second low-frequency processing module 1718 is connected to the combiner 8.

[0032] In some alternative embodiments, see Figure 2 The low-frequency preselection module 2003 includes a low-pass filter 2 connected from the power divider 1 to filter out the high-frequency signal components in the first low-frequency signal, and a first low-noise amplifier 3 connected from the low-pass filter 2 and connected to the first frequency conversion module 4005 to enhance the signal strength of the first low-frequency signal;

[0033] The first frequency conversion module 4005 includes a first mixer 4 connected from the first low noise amplifier 3 and connected to the first low frequency processing module 6007 to mix the first low frequency signal and output a first intermediate frequency signal, and a first local oscillator 5 connected to the first mixer 4 to output a first oscillation signal used for mixing.

[0034] In this optional embodiment, the low-pass filter 2 selectively filters out high-frequency signal components in the signal distributed by the power divider 1 and only allows low-frequency signals to pass, thereby reducing the difficulty of subsequent processing in the low-frequency signal processing module.

[0035] Furthermore, the first low-frequency processing module 6007 includes a first filter 6 connected from the first mixer 4 to filter out interference components in the first intermediate frequency signal, and a first amplifier 7 connected from the first filter 6 and connected to the third frequency conversion module 1516 to enhance the signal strength of the first intermediate frequency signal.

[0036] Furthermore, the third frequency conversion module 1516 includes a third mixer 15 connected from the first low-frequency processing module 6007 and connected to the second low-frequency processing module 1718 to mix the first intermediate frequency signal and output the third intermediate frequency signal, and a third local oscillator 16 connected to the third mixer 15 to output a third oscillation signal used for mixing.

[0037] Furthermore, the second low-frequency processing module 1718 includes a third amplifier 17 connected from the third mixer 15 to enhance the signal strength of the third intermediate frequency signal, and a third filter 18 connected from the third amplifier 17 and connected to the combiner 8 to filter out interference components in the third intermediate frequency signal.

[0038] In some specific implementations, when the low-frequency signal processing module pre-processes the low-frequency signal, the low-pass filter 2 selectively filters out the high-frequency signal in the signal distributed by the power divider 1, and only allows the low-frequency signal to pass; the first low-noise amplifier 3 amplifies the low-frequency signal passing through the low-pass filter 2, enhances the low-frequency signal strength, and facilitates the subsequent transmission and processing of the low-frequency signal; after the low-frequency signal is amplified by the first low-noise amplifier 3, it is mixed with the oscillation signal emitted by the first local oscillator 5 in the first mixer 4 to become a first intermediate frequency signal, after the first intermediate frequency signal passes through the first filter 6 to filter out the interference signal, it is transmitted from the first filter 6 to the first amplifier 7 for amplification, and then transmitted from the first amplifier 7 to the third mixer 15, mixed with the oscillation signal transmitted from the third local oscillator 16 in the third mixer 15, and becomes a third intermediate frequency signal, after the third intermediate frequency signal passes through the third amplifier 17, it is transmitted from the third amplifier 17 to the third filter 18, after the interference signal is filtered out in the third filter 18, it is transmitted to the combiner 8 to be combined with the signal pre-processed by the high-frequency signal processing module for output.

[0039] In some preferred embodiments, the high-frequency processing module includes a high-frequency pre-selection module 1314, a second frequency conversion module 1112, a first high-frequency processing module 1009, a second frequency conversion module 1922 and a second high-frequency processing module 2021 connected in sequence; wherein the high-frequency pre-selection module 1314 is connected to the power divider 1 to receive the first high-frequency signal, and the second high-frequency processing module 2021 is connected to the combiner 8.

[0040] In some alternative embodiments, see Figure 2 , the high frequency preselection module 1314 includes an attenuator 14 connected from the power divider 1 to attenuate the first high frequency signal, and a high pass filter 13 connected from the attenuator 14 and connected to the second frequency conversion module 1112 to filter out the low frequency signal component in the first high frequency signal;

[0041] The second frequency conversion module 1112 includes a second mixer 11 connected from the high-pass filter 13 and connected to the first high-frequency processing module 1009 to mix the first high-frequency signal and output a second intermediate frequency signal, and a second local oscillator 12 connected to the second mixer 11 to output a second oscillation signal used for mixing.

[0042] It should be noted that, in the above embodiment, the attenuator 14 attenuates the received signal (i.e., the first high-frequency signal) to attenuate the signal that exceeds the receiving frequency band of the radio frequency receiver until the radio frequency receiver can receive it. Subsequently, the high-pass filter 13 selectively filters out the low-frequency signal component in the signal distributed by the power divider 1, and only allows the high-frequency signal to pass, which is convenient for the subsequent transmission and processing of the high-frequency signal.

[0043] Further, the first high frequency processing module 1009 includes a second filter 10 connected from the second mixer 11 to filter out interference components in the second intermediate frequency signal, and a second amplifier 9 connected from the second filter 10 and connected to the second frequency conversion module 1922 to enhance the signal strength of the second intermediate frequency signal;

[0044] The second frequency conversion module 1922 includes a fourth mixer 19 connected from the second amplifier 9 and connected to the second high frequency processing module 2021 to mix the second intermediate frequency signal and output a fourth intermediate frequency signal, and a fourth local oscillator 22 connected to the fourth mixer 19 to output a fourth oscillation signal for mixing.

[0045] Furthermore, the second high-frequency processing module 2021 includes a fourth amplifier 20 connected from the fourth mixer 19 to enhance the signal strength of the fourth intermediate frequency signal, and a fourth filter 21 connected from the fourth amplifier 20 and connected to the combiner 8 to filter out interference components in the fourth intermediate frequency signal.

[0046] In some specific implementations, when the high-frequency signal processing module processes the high-frequency signal, the received signal (i.e., the first high-frequency signal) is attenuated through the attenuator 14, so that the signal exceeding the receiving frequency band of the RF receiver is attenuated until the RF receiver can receive it, and then the high-pass filter 13 selectively filters out the low-frequency signal in the signal distributed by the power divider 1, and only allows the high-frequency signal to pass; the high-frequency signal passing through the high-pass filter 13 is mixed with the oscillation signal emitted by the second local oscillator 12 in the second mixer 11 to become a second intermediate frequency signal, and the second After the intermediate frequency signal passes through the second filter 10 to filter out the interference signal, it is transmitted from the second filter 10 to the second amplifier 9 for amplification, and then transmitted from the second amplifier 9 to the fourth mixer 19, and mixed with the oscillation signal transmitted from the fourth local oscillator 22 in the fourth mixer 19 to become a fourth intermediate frequency signal. After the fourth intermediate frequency signal is amplified by the fourth amplifier 20, it is transmitted from the fourth amplifier 20 to the fourth filter 21. After the interference signal is filtered out in the fourth filter 21, it is transmitted to the combiner 8 to be combined and output with the signal pre-processed by the low-frequency signal processing module.

[0047] This embodiment further provides a radio frequency receiver, comprising the radio frequency receiver front-end anti-interference system described in the above embodiment.

[0048] It will be understood that the same or similar reference numerals correspond to the same or similar components;

[0049] The terms used to describe the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limiting the present application;

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0051] In different specific implementations, the method or system described in the present application can be implemented in software, hardware or a combination thereof. In addition, the order of the steps of the method can be changed, and various elements can be added, reordered, combined, omitted, modified, etc.

[0052] Obviously, the above-mentioned embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application, and are not intended to limit the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. Each discrete structure / function module or unit can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part, and the structure and function of the discrete components can be implemented as a combined structure or component. It is not necessary and impossible to enumerate all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the claims of the present application. In addition, the direct or indirect application of the technical solution of the present application in other related technical fields is also included in the patent protection scope of the present application.

Claims

1. A radio frequency receiver front-end anti-interference system, characterized in that: include: A power divider, used to divide the received antenna signal into a first low-frequency signal and a first high-frequency signal; A low frequency signal processing module, used for receiving the first low frequency signal and outputting a third intermediate frequency signal after pre-processing; A high frequency signal processing module, used for receiving the first high frequency signal and outputting a fourth intermediate frequency signal after preprocessing; The combiner is used to receive the third intermediate frequency signal and the fourth intermediate frequency signal, and combine them into one output.

2. The radio frequency receiver front-end anti-interference system according to claim 1, characterized in that: The low-frequency signal processing module includes a low-frequency preselection module, a first frequency conversion module, a first low-frequency processing module, a third frequency conversion module and a second low-frequency processing module connected in sequence; wherein, The low-frequency preselection module is connected to the power divider to receive the first low-frequency signal, and the second low-frequency processing module is connected to the combiner.

3. The radio frequency receiver front-end anti-interference system according to claim 2, characterized in that: The low-frequency preselection module includes a low-pass filter connected from the power divider to filter out high-frequency signal components in the first low-frequency signal, and a first low-noise amplifier connected from the low-pass filter and connected to the first frequency conversion module to enhance the signal strength of the first low-frequency signal; The first frequency conversion module includes a first mixer connected from the first low noise amplifier and connected to the first low frequency processing module to mix the first low frequency signal and output a first intermediate frequency signal, and a first local oscillator connected to the first mixer to output a first oscillation signal for mixing.

4. The radio frequency receiver front-end anti-interference system according to claim 3, characterized in that: The third frequency conversion module includes a third mixer connected from the first low-frequency processing module and connected to the second low-frequency processing module to mix the first intermediate frequency signal and output the third intermediate frequency signal, and a third local oscillator connected to the third mixer to output a third oscillation signal used for mixing.

5. The radio frequency receiver front-end anti-interference system according to claim 4, characterized in that: The second low frequency processing module includes a third amplifier connected from the third mixer to enhance the signal strength of the third intermediate frequency signal, and a third filter connected from the third amplifier and connected to the combiner to filter out interference components in the third intermediate frequency signal.

6. The radio frequency receiver front-end anti-interference system according to claim 3, characterized in that: The first low-frequency processing module includes a first filter connected from the first mixer to filter out interference components in the first intermediate frequency signal, and a first amplifier connected from the first filter and connected to the third frequency conversion module to enhance the signal strength of the first intermediate frequency signal.

7. A radio frequency receiver front-end anti-interference system according to any one of claims 1 to 6, characterized in that: The high-frequency processing module includes a high-frequency preselection module, a second frequency conversion module, a first high-frequency processing module, a fourth frequency conversion module and a second high-frequency processing module connected in sequence; wherein, The high-frequency preselection module is connected to the power divider to receive the first high-frequency signal, and the second high-frequency processing module is connected to the combiner.

8. The radio frequency receiver front-end anti-interference system according to claim 7, characterized in that: The high-frequency preselection module includes an attenuator connected from the power divider to attenuate the first high-frequency signal, and a high-pass filter connected from the attenuator and connected to the second frequency conversion module to filter out low-frequency signal components in the first high-frequency signal; The second frequency conversion module includes a second mixer connected from the high-pass filter and connected to the first high-frequency processing module to mix the first high-frequency signal and output a second intermediate frequency signal, and a second local oscillator connected to the second mixer to output a second oscillation signal for mixing.

9. The radio frequency receiver front-end anti-interference system according to claim 8, characterized in that: The first high frequency processing module includes a second filter connected from the second mixer to filter out interference components in the second intermediate frequency signal, and a second amplifier connected from the second filter and connected to the fourth frequency conversion module to enhance the signal strength of the second intermediate frequency signal; The fourth frequency conversion module includes a fourth mixer connected from the second amplifier and connected to the second high frequency processing module to mix the second intermediate frequency signal and output a fourth intermediate frequency signal, and a fourth local oscillator connected to the fourth mixer to output a fourth oscillation signal for mixing.

10. The radio frequency receiver front-end anti-interference system according to claim 9, characterized in that: The second high frequency processing module includes a fourth amplifier connected from the fourth mixer to enhance the signal strength of the fourth intermediate frequency signal, and a fourth filter connected from the fourth amplifier and connected to the combiner to filter out interference components in the fourth intermediate frequency signal.

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