Anti-interference LTE FDD wireless transmission terminal

Abstract

An anti-interference LTE FDD wireless transmission terminal provided by the utility model comprises an antenna, a radio frequency module, a baseband processing module and a power supply module, the radio frequency module comprises a duplexer, a power amplifier, a low noise amplifier, a radio frequency filter and a mixer, the duplexer is electrically connected with the antenna, and the power amplifier is electrically connected with the baseband processing module. The power amplifier is electrically connected with a transmitting port of the duplexer, the low noise amplifier is electrically connected with a receiving port of the duplexer, and the radio frequency filter is electrically connected with the antenna and the low noise amplifier. The frequency mixer is electrically connected with the radio frequency filter and the baseband processing module, the baseband processing module is electrically connected with the power amplifier, the radio frequency filter and the frequency mixer, and the power supply module is connected with the antenna, the radio frequency module and the baseband processing module.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless communication equipment technical field especially relates to a kind of anti-interference LTE FDD wireless transmission terminal. BACKGROUND

[0002] LTE FDD is one of current mainstream wireless communication technologies, widely used in part frequency band deployment of 4G to 5G network, which uses different frequency bands for communication based on frequency division duplex principle, and realizes efficient bidirectional transmission of data through ingenious frequency planning.

[0003] With the popularity of wireless communication technology and the explosive growth of various electronic devices, the electromagnetic environment is becoming more and more complex, and the interference sources of LTE FDD wireless transmission terminal are increasing. Co-channel interference is one of the common problems. In densely populated urban areas, due to the overlap of base station coverage, when different cells use the same frequency resources, the terminal is easily interfered by the co-channel interference from the adjacent cell during signal reception, resulting in signal quality degradation, error rate increase, and data transmission interruption, etc. In addition, unintentional electromagnetic radiation from industrial equipment, medical instruments and other devices poses a great challenge to traditional wireless transmission terminals. SUMMARY

[0004] The utility model aims at solving above-mentioned problem, and proposes a kind of anti-interference LTE FDD wireless transmission terminal.

[0005] To achieve the above object, the following technical scheme is adopted:

[0006] An anti-interference LTE FDD wireless transmission terminal includes an antenna, a radio frequency module, a baseband processing module and a power supply module. The radio frequency module includes a duplexer, a power amplifier, a low-noise amplifier, a radio frequency filter and a frequency mixer. The duplexer is electrically connected to the antenna. The power amplifier is electrically connected to the transmit port of the duplexer. The low-noise amplifier is electrically connected to the receive port of the duplexer. The radio frequency filter is electrically connected to the antenna and the low-noise amplifier respectively. The frequency mixer is electrically connected between the radio frequency filter and the baseband processing module. The baseband processing module is electrically connected to the power amplifier, the radio frequency filter and the frequency mixer respectively. The power supply module is connected to the antenna, the radio frequency module and the baseband processing module respectively.

[0007] Preferably, the radio frequency filter includes a spectrum analyzer, a microcontroller, a variable capacitor and an inductor array. The variable capacitor and the inductor array form a resonant circuit.

[0008] Preferably, the spectrum analyzer is connected with the baseband processing module through a high-speed data bus, the baseband processing module is electrically connected with the microcontroller, and the microcontroller is connected with the variable capacitance and inductance array through an electric tuning circuit.

[0009] Preferably, the mixer comprises an analog-to-digital converter, a signal processor and a digital-to-analog converter, the analog-to-digital converter is connected with the signal processor, the signal processor is electrically connected with the digital-to-analog converter, the analog-to-digital converter is located at the front end of the mixer, and the mixer is provided with a superposition circuit at the tail end.

[0010] Preferably, the signal processor adopts a fast Fourier transform algorithm and a parameter extraction algorithm to analyze the digital signal and obtain the characteristics of the interference signal, including amplitude, frequency and phase.

[0011] Preferably, the signal processor generates a cancellation signal according to the characteristics of the interference signal, the cancellation signal has the same frequency and equal amplitude as the interference signal but opposite phase, and the cancellation signal is converted into an analog signal by the digital-to-analog converter and transmitted to the superposition circuit.

[0012] Preferably, the input end of the superposition circuit is connected with the radio frequency filter and the digital-to-analog converter, and the output end of the superposition circuit is connected with the baseband processing module.

[0013] Compared with the prior art, the wireless transmission terminal adopts a radio frequency filter, the spectrum analyzer, the microcontroller and the variable capacitance and inductance array cooperate with each other, the spectrum analyzer rapidly detects the interference signal, the value of the variable capacitance and inductance is accurately changed through an electric tuning mode, the resonant frequency and bandwidth of the filter are adjusted, the accuracy of data transmission is improved, the analog-to-digital converter, the signal processor and the digital-to-analog converter are added to the mixer, the frequency, amplitude and phase of the interference signal are accurately extracted, the cancellation signal with equal amplitude and opposite phase is generated, the original received signal is superposed with the cancellation signal by the superposition circuit, the interference signal can be effectively cancelled, the signal purity is improved, and the anti-interference capability is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a structural schematic view of an anti-interference LTE FDD wireless transmission terminal according to the present application;

[0015] Figure 2 FIG. 2 is a schematic view of a radio frequency filter of the anti-interference LTE FDD wireless transmission terminal according to the present application;

[0016] Figure 3 FIG. 3 is a schematic view of a mixer of the anti-interference LTE FDD wireless transmission terminal according to the present application.

[0017] In the figure: antenna 1; radio frequency module 2; baseband processing module 3; power module 4; duplexer 21; power amplifier 22; low noise amplifier 23; radio frequency filter 24; mixer 25; spectrum analyzer 241; microcontroller 242; variable capacitor 243; inductance array 244; analog-to-digital converter 251; signal processor 252; digital-to-analog processor 253; superposition circuit 254; DETAILED DESCRIPTION

[0018] Hereinafter, a kind of anti-interference LTE FDD wireless transmission terminal of the utility model is specifically described with reference to the drawings.

[0019] As Figure 1 shown, a kind of anti-interference LTE FDD wireless transmission terminal, including antenna 1, radio frequency module 2, baseband processing module 3 and power module 4, radio frequency module 2 includes duplexer 21, power amplifier 22, low noise amplifier 23, radio frequency filter 24 and mixer 25, duplexer 21 is electrically connected with antenna 1, power amplifier 22 is electrically connected with the transmitting port of duplexer 21, low noise amplifier 23 is electrically connected with the receiving port of duplexer 21, radio frequency filter 24 is electrically connected with antenna 1 and low noise amplifier 22 respectively, mixer 25 is electrically connected between radio frequency filter 24 and baseband processing module 3 respectively, baseband processing module 3 is electrically connected with power amplifier 22, radio frequency filter 24 and mixer 25 respectively, power module 4 is connected with antenna 1, radio frequency module 2 and baseband processing module 3 respectively.

[0020] As Figure 2 shown, preferably, radio frequency filter 24 includes spectrum analyzer 241, microcontroller 242, variable capacitor 243 and inductance array 244, and variable capacitor 243 and inductance array 244 form a resonant circuit.

[0021] Among them, the resonant circuit formed by variable capacitor 243 and inductance array 244 accurately changes the value of capacitance and inductance by electric tuning mode, and then adjusts the resonant frequency and bandwidth of filter.

[0022] Preferably, spectrum analyzer 241 is connected with baseband processing module 3 by high-speed data bus, baseband processing module 3 is electrically connected with microcontroller 242, and microcontroller 242 is connected with variable capacitor 243 and inductance array 244 by electric tuning line.

[0023] The spectrum analyzer 241 is connected with the baseband processing module 3 through a high-speed data bus, and can realize fast data transmission, so that the baseband processing module 3 can analyze signals in time, judge whether there is interference and the characteristics of the interference, the connection between the baseband processing module 3 and the microcontroller 242 ensures that the baseband processing module 3 can effectively command the radio frequency filter 24 to adjust parameters, and the electric tuning circuit can realize high-precision control of the capacitance and inductance value, so as to realize dynamic adjustment of the filter resonance frequency and bandwidth.

[0024] As shown in Figure 3 Preferably, the mixer 25 comprises an analog-to-digital converter 251, a signal processor 252 and a digital-to-analog converter 253, the analog-to-digital converter 251 is electrically connected with the signal processor 252, the signal processor 252 is electrically connected with the digital-to-analog converter 253, the analog-to-digital converter 251 is located at the front end of the mixer 25, and the mixer 25 is provided with a superposition circuit 254 at the tail end.

[0025] The analog-to-digital converter 251 can sample the signal received by the antenna 1, and the analog-to-digital converter 251 is arranged at the front end of the mixer 25, so that the interference signal can be sampled in the first time.

[0026] Preferably, the signal processor 252 adopts a fast Fourier transform algorithm and a parameter extraction algorithm to analyze the digital signal and obtain the characteristics of the interference signal, including amplitude, frequency and phase.

[0027] The signal processor 252 performs frequency spectrum analysis on the digital signal by the fast Fourier transform algorithm and the parameter extraction algorithm according to the interference signal sampled by the analog-to-digital converter 251, so as to accurately determine the key parameters of the interference signal, such as frequency, amplitude and phase, and provide a data basis for subsequent generation of a cancellation signal.

[0028] Preferably, the signal processor 252 generates a cancellation signal according to the characteristics of the interference signal, the cancellation signal has the same frequency as the interference signal, the same amplitude and the opposite phase, and the cancellation signal is converted into an analog signal by the digital-to-analog converter 253 and transmitted to the superposition circuit 254.

[0029] Preferably, the input end of the superposition circuit 254 is connected with the radio frequency filter 24 and the digital-to-analog converter 253 respectively, and the output end of the superposition circuit 254 is connected with the baseband processing module 3.

[0030] After the signal processor 252 determines the characteristic parameters of the interference signal, a cancellation signal is generated according to the parameters by using digital signal processing technology, and the cancellation signal is superimposed with the original received signal through the superposition circuit 254 to cancel the interference signal, so as to greatly improve the quality of the intermediate frequency signal and the accuracy of data transmission.

[0031] In this embodiment, the wireless transmission terminal receives the magnetic wave signal through the antenna 1, the magnetic wave signal enters the low noise amplifier 23 through the receiving end of the duplexer 21, the low noise amplifier 23 enhances the weak signal to a processable amplitude and reduces the introduction of noise, and the amplified signal enters the radio frequency filter 24.

[0032] The radio frequency filter 24 analyzes the signal according to the spectrum analyzer 241 and feeds back to the baseband processing module 3, when the baseband processing module 3 determines that there is an interference signal and determines its characteristics, immediately sends a control instruction to the microcontroller 242. The microcontroller 242 receives the instruction, accurately changes the value of the variable capacitor and inductor through the electric tuning mode, and then adjusts the resonant frequency and bandwidth of the radio frequency filter 24.

[0033] The signal processed by the radio frequency filter 24 enters the mixer 25, the analog-to-digital converter 251 at the front end of the mixer 25 samples the radio frequency signal, converts the analog signal into a digital signal, and then sends it into the signal processor 252, the signal processor 252 uses the fast Fourier transform algorithm and parameter extraction algorithm to perform spectrum analysis on the digital signal, accurately determines the frequency, amplitude and phase of the interference signal and other key parameters, generates a cancellation signal with the same amplitude and opposite phase as the interference signal according to these parameters, converts it back to an analog signal through the digital-to-analog converter 253, and uses the superposition circuit 254 to superimpose the original received signal and the cancellation signal, thereby realizing effective cancellation of the interference signal.

[0034] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have other optimization schemes and additional functions. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An anti-jamming LTE FDD wireless transmission terminal, characterized in that: It includes antenna (1), radio frequency module (2), baseband processing module (3) and power module (4), the radio frequency module (2) includes duplexer (21), power amplifier (22), low noise amplifier (23), radio frequency filter (24) and mixer (25), the duplexer (21) is electrically connected with the antenna (1), the power amplifier (22) is electrically connected with the transmitting port of the duplexer (21), the low noise amplifier (23) is electrically connected with the receiving port of the duplexer (21), the radio frequency filter (24) is electrically connected with the antenna (1), low noise amplifier (23) respectively, the mixer (25) is electrically connected between radio frequency filter (24) and baseband processing module (3) respectively, the baseband processing module (3) is electrically connected with the power amplifier (22), radio frequency filter (24) and mixer (25) respectively, the power module (4) is connected with the antenna (1), radio frequency module (2) and baseband processing module (3) respectively.

2. The anti-jamming LTE FDD wireless transmission terminal of claim 1, wherein: The radio frequency filter (24) includes spectrum analyzer (241), microcontroller (242), variable capacitor (243) and inductance array (244), the variable capacitor (243) and the inductance array (244) constitute a resonant circuit.

3. The anti-jamming LTE FDD wireless transmission terminal of claim 2, wherein: The spectrum analyzer (241) is connected with the baseband processing module (3) through a high-speed data bus, the baseband processing module (3) is electrically connected with the microcontroller (242), and the microcontroller (242) is connected with the variable capacitor (243) and the inductance array (244) through an electric tuning circuit.

4. The anti-jamming LTE FDD wireless transmission terminal of claim 1, wherein: The mixer (25) includes analog-to-digital converter (251), signal processor (252) and digital-to-analog converter (253), the analog-to-digital converter (251) is connected with the signal processor (252), the signal processor (252) is electrically connected with the digital-to-analog converter (253), the analog-to-digital converter (251) is located at the front end of the mixer (25), and the mixer (25) is provided with superimposed circuit (254) at the tail end.

5. The anti-jamming LTE FDD wireless transmission terminal of claim 4, wherein: The analog-to-digital converter (251) converts analog signals into digital signals, the signal processor (252) adopts fast Fourier transform algorithm and parameter extraction algorithm, analyzes the digital signals, obtains the characteristics of interference signals, including amplitude, frequency and phase.

6. The anti-jamming LTE FDD wireless transmission terminal of claim 5, wherein: The signal processor (252) generates a cancellation signal according to the analysis of the characteristics of the interference signals, the cancellation signal has the same frequency as the interference signal, the same amplitude and the opposite phase, and the cancellation signal is converted into an analog signal by the digital-to-analog converter (253) and is transmitted to the superimposed circuit (254).

7. The anti-jamming LTE FDD wireless transmission terminal of claim 6, wherein: The input end of the superimposed circuit (254) is connected with the radio frequency filter (24) and the digital-to-analog converter (253) respectively, and the output end of the superimposed circuit (254) is connected with the baseband processing module (3).

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