TWI807676B - Signal processing device - Google Patents

Abstract

A signal processing device includes a proximal end device, a connection unit, and a distal end device. The proximal end device generates a first radio frequency signal. The connection unit is coupled to the proximal end device, and receives and transmits the first radio frequency signal. The distal end device is coupled to the connection unit, receives the first radio frequency signal, performs a power detection for the first radio frequency signal to generate a detection signal, and generates a control signal according to a comparison result of the detection signal and a predetermined reference value. The distal end device transmits the control signal to the connection unit. The proximal end device further receives the control signal through the connection unit, and adjusts the first radio frequency signal according to the control signal, so as to generate a second radio frequency signal.

Description

signal processing device

The present invention relates to a processing device, in particular to a signal processing device.

The era of unmanned driving is coming, and the cellular vehicle-to-everything (C-V2X) communication that assists unmanned driving is particularly important. For the RF signal transmission line of the cellular Internet of Vehicles communication, a higher carrier frequency means a larger line loss.

However, due to the design and volume of mobile devices (such as automobiles), the installation location of the antenna and the installation location of the communication module are often far apart, and a long RF transmission line may cause a certain degree of signal loss (for example, 5~10dB), which will mean a decline in communication distance and quality, and signal attenuation leads to low coverage of RF products or even failure to work normally, and restricts subsequent technological development. Therefore, how to effectively adjust and compensate the signal attenuation loss of the radio frequency signal is an important issue at present.

The present invention provides a signal processing device for adjusting and compensating signal transmission loss by performing bidirectional linear closed-loop control on radio frequency signals, so as to increase signal linearity and signal coverage, and increase convenience in use.

The invention provides a signal processing device, which includes a near-end device, a connection unit and a remote device. The near-end device generates a first radio frequency signal. The connection unit is coupled to the proximal device, and receives and transmits the first radio frequency signal. The remote device is coupled to the connection unit, receives the first radio frequency signal, and performs power detection on the first radio frequency signal to generate a detection signal, and generates a control signal according to a comparison result between the detection signal and a preset reference value. The remote device transmits the control signal to the connection unit. The near-end device further receives the control signal through the connection unit, and adjusts the first radio frequency signal according to the control signal to generate the second radio frequency signal.

The signal processing device disclosed in the present invention can effectively perform two-way linear closed-loop control on radio frequency signals to adjust and compensate signal transmission loss, so as to increase signal linearity and signal coverage, and increase convenience in use.

The technical terms in this specification refer to the customary terms in this technical field. If some terms are explained or defined in this specification, the explanation or definition of this part of the terms shall prevail. Each embodiment of the disclosure has one or more technical features. On the premise of possible implementation, those skilled in the art may selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

It must be understood that words such as "comprising" and "comprising" used in this specification are used to indicate the existence of specific technical features, values, method steps, operations, components and/or components, but it does not exclude that more technical features, values, method steps, operations, processes, components, components, or any combination of the above may be added.

Words such as "first" and "second" are used to modify components, and are not used to indicate a priority or precedence relationship among them, but are only used to distinguish components with the same name.

In some embodiments of the present invention, unless otherwise specified, the term "coupled" may include any direct and indirect electrical connection means.

In the various embodiments listed below, the same or similar elements or components will be denoted by the same reference numerals.

FIG. 1 is a schematic diagram of a signal processing device according to an embodiment of the present invention. The signal processing device 100 of this embodiment is suitable for mobile devices (such as automobiles) with radio frequency signal transmission (such as cellular Internet of Vehicles communication), but the embodiment of the present invention is not limited thereto. Please refer to FIG. 1 , the signal processing device 100 may include a near-end device 110 , a connection unit 120 and a remote device 130 .

The near-end device 110 can generate a first radio frequency signal. In this embodiment, the frequency range of the first radio frequency signal is, for example, 2 GHz to 10 GHz, but the embodiment of the present invention is not limited thereto.

The connection unit 120 is coupled to the proximal device 110 . The connecting unit 120 can receive and transmit the first radio frequency signal. In this embodiment, the connection unit 120 is, for example, a radio frequency cable (radio frequency cable, RF cable).

The remote device 130 is coupled to the connection unit 120 . The remote device 130 may receive the first radio frequency signal transmitted by the connection unit 120, and perform power detection on the first radio frequency signal to generate a detection signal. For example, when the remote device 130 receives the first radio frequency signal transmitted by the connection unit 120, the remote device 130 may perform power detection on the first radio frequency signal, for example, convert the power value of the first radio frequency signal into a voltage signal, and use the voltage signal as the detection signal to generate a detection signal corresponding to the voltage signal.

Next, the remote device 130 can generate a control signal according to a comparison result between the detection signal and a preset reference value. For example, the remote device 130 may first compare the detection signal with a preset reference value to generate a comparison result, and then confirm whether the detection signal is the same or similar to the preset reference value. When the remote device 130 confirms that the comparison result is that the detection signal is the same or similar to the preset reference signal, the remote device 130 will not generate the control signal.

In addition, when the remote device 130 confirms that the comparison result is that the detected signal is not the same or not similar to the preset reference value, the remote device 130 will generate a control signal. Afterwards, the remote device 130 can transmit the control signal to the connection unit 120 .

For example, the remote device 130 may transmit the control signal to the connection unit 120 in the form of a command, and the communication protocol for the above-mentioned signal transmission includes, for example, an inter-integrated circuit (I2C) protocol, a universal asynchronous receiver/transmitter (UART), etc., but the embodiment of the present invention is not limited thereto.

Next, the near-end device 110 can further receive the control signal through the connection unit 120 . That is to say, after the remote device 130 generates the control signal, the remote device 130 can feed back the control signal to the near-end device 110 through the connection unit 120 . Afterwards, the near-end device 110 may adjust the first radio frequency signal (for example, adjust a signal parameter of the first radio frequency signal) according to the control signal to generate the second radio frequency signal. The foregoing signal parameters include, for example, signal gain, power index value, etc., but this embodiment of the present invention is not limited thereto.

Next, the near-end device 110 can transmit the second radio frequency signal to the remote device 130 through the connection unit 120, so that the parameters of the radio frequency signal sent by the remote device 130 meet the requirements. In this way, this embodiment can adjust and compensate the signal transmission loss through the two-way linear closed-loop control of the main power of the radio frequency signal through a connecting unit 120, so as to increase the signal linearity and signal coverage, and increase the convenience of use.

In some embodiments, when the remote device 130 confirms that the detection signal is different or not similar to the preset reference value, the remote device 130 can further adjust the gain of the first radio frequency signal according to the control signal to generate the third radio frequency signal. In addition, in some embodiments, when the remote device 130 confirms that the comparison result is that the detection signal is not the same or not similar to the preset reference value, the remote device 130 may simultaneously transmit a control signal to the connection unit 120 for feedback to the near-end device 110, and adjust the gain of the first radio frequency signal to generate a third radio frequency signal.

In this embodiment, the signal processing device 100 further includes a first antenna unit 140 and a second antenna unit 150 . The first antenna unit 140 can be coupled to the proximal device 110 through a radio frequency cable, and the second antenna unit 150 can be coupled to the remote device 130 through a radio frequency cable. In this embodiment, the near-end device 110 can choose to transmit the first radio frequency signal to the first antenna unit 140 , or transmit the first radio frequency signal or the second radio frequency signal to the connection unit 120 . Further, the near-end device 110 can choose to transmit the first radio frequency signal to the first antenna unit 140 or to transmit the first radio frequency signal or the second radio frequency signal to the connection unit 120 according to the distance between the near-end device 110 and the first and second antenna units 140, 150 (for example, the length of the radio frequency cable between the near-end device 110 and the first antenna unit 140).

For example, when the distance between the near-end device 110 and the first antenna unit 140 is relatively short (for example, the length of the radio frequency cable between the near-end device 110 and the first antenna unit 140 is less than or equal to a preset length), the near-end device 110 may select to transmit the first radio frequency signal to the first antenna unit 140, so as to transmit the first radio frequency signal to the corresponding device through the first antenna unit 140. In addition, when the distance between the near-end device 110 and the second antenna unit 150 is relatively long (for example, the length of the radio frequency cable between the near-end device 110 and the second antenna unit 150 is greater than the aforementioned preset length), the near-end device 110 can choose to transmit the first radio frequency signal or the second radio frequency signal to the remote device 130 through the connection unit 120. The second antenna unit 150 can receive and transmit the third radio frequency signal generated by the remote device 130 or the second radio frequency signal transmitted by the remote device 130, so that the second radio frequency signal or the third radio frequency signal can be transmitted to a corresponding device for subsequent processing. In this embodiment, the preset length is, for example, 50 cm, but the embodiment of the present invention is not limited thereto.

Fig. 2 is a detailed circuit diagram of the signal processing device in Fig. 1. Please refer to FIG. 2 , the signal processing device 100 includes a near-end device 110 , a connection unit 120 , a remote device 130 , a first antenna unit 140 and a second antenna unit 150 . In this embodiment, the connection unit 120, the first antenna unit 140, and the second antenna unit 150 are the same or similar to the connection unit 120, the first antenna unit 140, and the second antenna unit 150 of FIG.

The near-end device 110 may include a first control signal transmission module 202 , a radio frequency signal transmission module 204 and a first control module 206 .

The first control signal transmission module 202 is coupled to the connection unit 120 . The first control signal transmission module 202 can receive and transmit control signals through the connection unit 120 . Further, the first control signal transmission module 202 may include a first capacitor C1 and a first control signal transmission unit 203 . The first capacitor C1 has a first terminal and a second terminal. A first end of the first capacitor C1 is coupled to the connection unit 120 . In this embodiment, the capacitance range of the first capacitor C1 is, for example, 100 pF to 10 nF, but the embodiment of the present invention is not limited thereto. The first control signal transmission unit 203 is coupled to the second end of the first capacitor C1 and the first control module 206 , and receives and transmits the control signal to the first control module 206 through the first capacitor C1 . In some embodiments, the first control signal transmission unit 203 may, for example, demodulate the control signal through an intermediate frequency signal. In this embodiment, the frequency range of the intermediate frequency signal is, for example, 10 MHz to 200 MHz, and the demodulation method includes frequency modulation (frequency modulation, FM), frequency shift keying (frequency shift keying, FSK), amplitude shift keying (amplitude shift keying, ASK), but the embodiment of the present invention is not limited thereto.

The RF signal transmission module 204 is coupled to the connection unit 120 . The radio frequency signal transmission module 204 can receive and transmit the first radio frequency signal or the second radio frequency signal. Further, the radio frequency signal transmission module 204 may include a second capacitor C2 and a radio frequency signal transmission unit 205 . The second capacitor C2 has a first terminal and a second terminal. A first end of the second capacitor C2 is coupled to the connection unit 120 . In this embodiment, the capacitance range of the second capacitor C2 is, for example, 7 pF to 33 pF, but the embodiment of the present invention is not limited thereto. The radio frequency signal transmission unit 205 is coupled to the second terminal of the second capacitor C2 and the first control module 206, and the radio frequency signal transmission unit 205 receives the first radio frequency signal or the second radio frequency signal generated by the first control module 206, and transmits the first radio frequency signal or the second radio frequency signal to the connection unit 120 through the second capacitor C2.

The first control module 206 is coupled to the radio frequency signal transmission module 204 and the first control signal transmission module 202 . The first control module 206 can generate a first radio frequency signal, and the first radio frequency signal can be transmitted to the connection unit 120 through the radio frequency signal transmission module 204 . In addition, the first control module 206 can receive the control signal through the first control signal transmission module 202, and adjust the first radio frequency signal according to the control signal to generate the second radio frequency signal. In this embodiment, the first control module 206 may include a microcontroller (micro control unit, MCU) or a microprocessor (micro-processor), but the embodiment of the present invention is not limited thereto.

Further, in some embodiments, the near-end device 110 further includes a power module 208 . The power module 208 is coupled to the first control module 206 and the connection unit 120 . The power supply module 208 can be controlled by the first control module 206 to generate a power signal V1, and the power signal V1 is transmitted to the remote device 130 through the connection unit 120, so as to provide the power required for the operation of the remote device 130 and its internal components (such as the second control module 216, the signal output module 218, the second control signal transmission unit 221, etc.).

Further, the power module 208 may include a first inductor L1 and a power unit 209 . The first inductor L1 has a first terminal and a second terminal. A first end of the first inductor L1 is coupled to the connection unit 120 . In this embodiment, the inductance range of the first inductor L1 is, for example, 6.8nH to 15.2nH, but the embodiment of the present invention is not limited thereto.

The power unit 209 is coupled to the second end of the first inductor L1 and the first control module 206 . The power supply unit 209 can generate a power signal V1 through the control of the first control module 206, and the power signal V1 can be transmitted to the remote device 130 through the connection unit 120, so as to provide the power required for the operation of the remote device 130 and its internal components (such as the second control module 216, the signal output module 218, the second control signal transmission unit 221, etc.).

In addition, in some embodiments, the proximal device 110 further includes a switch module 210 . The switch module 210 is coupled between the first control module 206 and the radio frequency signal transmission module 204 and the connection unit 120 . The switch module 210 can select to transmit the first radio frequency signal to the first antenna unit 140 or transmit the first radio frequency signal or the second radio frequency signal to the connection unit 120 according to the control of the first control module 206 .

For example, when the distance between the near-end device 110 and the first antenna unit 140 is relatively short (for example, the length of the radio frequency cable between the near-end device 110 and the first antenna unit 140 is less than or equal to a preset length), the first control module 206 can control the switch module 210 to transmit the first radio frequency signal to the first antenna unit 140, so as to transmit the first radio frequency signal to the corresponding device through the first antenna unit 140. In addition, when the distance between the near-end device 110 and the second antenna unit 150 is relatively long (for example, the length of the radio frequency cable between the near-end device 110 and the second antenna unit 150 is greater than the preset length), the first control module 206 can control the switch module 210 to transmit the first radio frequency signal or the second radio frequency signal to the remote device 130 through the connection unit 120, so that the remote device 130 can perform subsequent processing and then transmit it to the second antenna unit 150. In this embodiment, the preset length is, for example, 50 cm, but the embodiment of the present invention is not limited thereto.

The remote device 130 may include a filter module 212 , a detection module 214 , a second control module 216 , a signal output module 218 and a second control signal transmission module 220 .

The filter module 212 is coupled to the connection unit 120 . The filtering module 212 can receive the first RF signal or the second RF signal transmitted by the connection unit 120 and filter the first RF signal or the second RF signal to generate a filtered first RF signal or a filtered second RF signal. Further, the filter module 212 may include a third capacitor C3 and a filter 213 . The third capacitor C3 has a first terminal and a second terminal. A first end of the third capacitor C3 is coupled to the connection unit 120 . In this embodiment, the capacitance range of the third capacitor C3 is, for example, 7 pF to 33 pF, but the embodiment of the present invention is not limited thereto.

The filter 213 is coupled to the second end of the third capacitor C3 and the detection module 214 . The filter 213 can receive the first radio frequency signal or the second radio frequency signal through the third capacitor C3, and filter the first radio frequency signal or the second radio frequency signal to generate a filtered first radio frequency signal or a filtered second radio frequency signal, and the filtered first radio frequency signal can be transmitted to the detection module 214. In this embodiment, the filter 213 is, for example, a band pass filter, but the embodiment of the present invention is not limited thereto.

The detection module 214 is coupled to the filter module 212 . The detection module 214 can perform power detection on the filtered first radio frequency signal to generate a detection signal. That is to say, the detection module 214 can detect the power of the first radio frequency signal to convert the power value of the first radio frequency signal into a voltage signal, and use the voltage signal as a detection signal to generate a detection signal. In this embodiment, the detection module 214 detects a small part of the first radio frequency signal, and the rest of the first radio frequency signal is always transmitted to the antenna unit (such as the second antenna unit 150 ).

The second control module 216 is coupled to the detection module 214 . The second control module 216 can receive the detection signal generated by the detection module 214, and generate a control signal according to a comparison result between the detection signal and a preset reference value. For example, the second control module 216 can compare the detection signal with a preset reference value through a look-up table to generate a comparison result, and then confirm whether the detection signal is the same or similar to the preset reference value. In this embodiment, the second control module 216 is, for example, a microcontroller or a microprocessor, but the embodiment of the invention is not limited thereto. Furthermore, the second control module 216 further includes an analog-to-digital converter (analog-to-digital converter, ADC) for performing analog-to-digital conversion on the detection, and comparing the converted digital signal with a preset reference value.

The signal output module 218 is coupled to the filter module 212 and the second control module 216 . In some embodiments, the signal output module 218 can receive the filtered first radio frequency signal, and adjust the gain of the first radio frequency signal according to the control signal to generate the third radio frequency signal. That is to say, when the second control module 216 confirms that the comparison result is that the detection signal is different or not similar to the preset reference value, the second control module 216 will transmit the above-mentioned control signal to the signal output module 218, so that the signal output module 218 adjusts the gain of the first radio frequency signal to generate the third radio frequency signal. Then, the third radio frequency signal can be transmitted to the corresponding device through the second antenna unit 150 . In some embodiments, the signal output module 218 can receive the filtered second radio frequency signal and output the second radio frequency signal. Then, the second radio frequency signal can be transmitted to the corresponding device through the second antenna unit 150 . In this way, the parameters of the radio frequency signal sent by the remote device 130 can meet requirements.

The second control signal transmission module 220 is coupled to the second control module 216 and the connection unit 120 . The second control signal transmission module 220 can receive and transmit the control signal generated by the second control module 216 . That is to say, when the second control module 216 confirms that the detection signal is different or not similar to the preset reference value, the second control module 216 can transmit the control signal to the second control signal transmission module 220, so that the second control signal transmission module 220 transmits the control signal to the connection unit 120, and then feeds back the control signal to the first control module 206 of the proximal device 110, so that the first control module 206 can adjust the first radio frequency signal according to the control signal to generate the second radio frequency signal. Further, the second control signal transmission module 220 may include a fourth capacitor C4 and a second control signal transmission unit 221 .

The fourth capacitor C4 has a first terminal and a second terminal. A first end of the fourth capacitor C4 is coupled to the connection unit 120 . In this embodiment, the capacitance range of the fourth capacitor C4 is, for example, 100 pF to 10 nF, but the embodiment of the present invention is not limited thereto. The second control signal transmission unit 221 is coupled to the second end of the fourth capacitor C4 and the second control module 216 . The second control signal transmission unit 221 can receive the control signal generated by the second control module 216, and then transmit the control signal to the connection unit 120 through the fourth capacitor C4. In some embodiments, the second control signal transmission unit 221 can, for example, modulate the control signal through an intermediate frequency signal. The frequency range of the IF signal is, for example, 10 MHz to 200 MHz, and the modulation methods include frequency modulation (FM), frequency key shift (FSK), and amplitude key shift (ASK), but the embodiments of the present invention are not limited thereto.

Then, the IF-modulated control signal is transmitted to the first control signal transmission unit 203 through the connection unit 120 . Afterwards, the first control signal transmission unit 203 performs intermediate frequency signal demodulation on the above control signal, and transmits the demodulated control signal to the first control module 206, so that the first control module 206 can adjust the first radio frequency signal according to the above control signal to generate the second radio frequency signal.

Further, in some embodiments, the remote device 130 further includes a coupler 222 and an attenuator 224 . The coupler 222 is coupled between the filter module 212 and the signal output module 218 . The coupler 222 can couple the filtered first radio frequency signal or the filtered second radio frequency signal generated by the filtering module 212, and transmit the coupled first radio frequency signal or the second radio frequency signal to the signal output module 218 for subsequent processing. In this embodiment, the coupling frequency range of the coupler 222 is, for example, 10 dB, but this embodiment of the present invention is not limited thereto.

The attenuator 224 is coupled between the coupler 222 and the detection module 214 . The attenuator 224 can perform signal attenuation processing on the coupled first radio frequency signal generated by the coupler 222, and transmit the signal attenuated first radio frequency signal to the detection module 214, so that the detection module 214 can perform power detection on the first radio frequency signal. In this embodiment, the attenuation frequency range of the attenuator 224 is, for example, 20 dB, but the embodiment of the present invention is not limited thereto.

In addition, in some embodiments, the remote device 130 further includes a second inductor L2. The second inductor L2 has a first terminal and a second terminal. A first end of the second inductor L2 is coupled to the connection unit 120 . The second end of the second inductor L2 is coupled to the power signal V1, and the power signal V1 can be provided to the second control module 216, the signal output module 218, the second control signal transmission unit 221 and the like, for example.

In FIG. 1 and FIG. 2 , the signal processing device 100 includes a first antenna unit 140 and a second antenna unit 150 , but the embodiment of the present invention is not limited thereto. In some embodiments, the signal processing device 100 may only include the second antenna unit 150 , that is, the signal processing device 100 may not include the first antenna unit 140 . When the signal processing unit 100 does not include the first antenna unit 140 , the near-end device 110 may not include the switch module 210 , that is, the RF signal transmission module 204 may not be coupled to the connection unit 120 through the switch module 210 .

To sum up, the signal processing device disclosed in the present invention generates a first radio frequency signal through the near-end device, the connecting unit transmits the first radio frequency signal, and the remote device receives the first radio frequency signal and performs power detection on the first radio frequency signal to generate a detection signal, and generates a control signal according to a comparison result between the detection signal and a preset reference value. The remote device transmits the control signal to the connection unit. The near-end device further receives the control signal through the connection unit, and adjusts the signal parameters of the first radio frequency signal according to the control signal. In addition, the control signal, the power signal, and the radio frequency signal (the first radio frequency signal or the second radio frequency signal) are all transmitted through the same connection unit (radio frequency cable). In this way, bidirectional linear closed-loop control can be effectively performed on the radio frequency signal to adjust or compensate signal loss, so as to increase signal linearity and signal coverage, and increase convenience in use.

Although the present invention is disclosed above with the embodiments, it is not intended to limit the scope of the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

100: Signal processing device 110: proximal device 120: Connection unit 130: remote device 140: the first antenna unit 150: Second antenna unit 202: The first control signal transmission module 203: the first control signal transmission unit 204: RF signal transmission module 205: RF signal transmission unit 206: The first control module 208: Power module 209: Power supply unit 210: switch module 212:Filter module 213: filter 214: Detection module 216: Second control module 218: Signal output module 220: Second control signal transmission module 221: the second control signal transmission unit 222: coupler 224: Attenuator C1: the first capacitor C2: second capacitor C3: the third capacitor C4: the fourth capacitor L1: the first inductance L2: Second inductance V1: power signal

FIG. 1 is a schematic diagram of a signal processing device according to an embodiment of the present invention. Fig. 2 is a detailed circuit diagram of the signal processing device in Fig. 1.

100: Signal processing device

110: proximal device

120: Connection unit

130: remote device

140: the first antenna unit

150: Second antenna unit

Claims (18)

A signal processing device, comprising: a near-end device generating a first radio frequency signal; a connecting unit, coupled to the near-end device, to receive and transmit the first radio frequency signal; and A remote device, coupled to the connection unit, receives the first radio frequency signal, and performs a power detection on the first radio frequency signal to generate a detection signal, and generates a control signal according to a comparison result between the detection signal and a preset reference value, and the remote device transmits the control signal to the connection unit; Wherein, the near-end device further receives the control signal through the connection unit, and adjusts the first radio frequency signal according to the control signal to generate a second radio frequency signal. The signal processing device according to claim 1, wherein the near-end device includes: A first control signal transmission module, coupled to the connection unit, receives and transmits the control signal through the connection unit; A radio frequency signal transmission module, coupled to the connection unit, receives and transmits the first radio frequency signal or the second radio frequency signal; and A first control module, coupled to the radio frequency signal transmission module and the first control signal transmission module, generates the first radio frequency signal, receives the control signal, and adjusts the first radio frequency signal according to the control signal to generate the second radio frequency signal. The signal processing device according to claim 2, wherein the first control signal transmission module includes: a first capacitor having a first end and a second end, the first end of the first capacitor is coupled to the connection unit; and A first control signal transmission unit is coupled to the second end of the first capacitor and the first control module. The signal processing device according to claim 2, wherein the radio frequency signal transmission module includes: a second capacitor having a first end and a second end, the first end of the second capacitor is coupled to the connection unit; and A radio frequency signal transmission unit is coupled to the second terminal of the second capacitor and the first control module. The signal processing device according to claim 2, wherein the near-end device further includes: A power supply module is coupled to the first control module and the connection unit, the power supply module is controlled by the first control module to generate a power signal, and the power signal is transmitted to the remote device through the connection unit. As the signal processing device of claim 5, wherein the power module includes: a first inductor having a first end and a second end, the first end of the first inductor is coupled to the connection unit; and A power supply unit is coupled to the second end of the first inductor and the first control module. The signal processing device of claim 1 further includes: A first antenna unit is coupled to the near-end device, wherein the first antenna unit receives and transmits the first radio frequency signal. As the signal processing device of claim 7, wherein the near-end device further includes: A switch module is coupled between the first control module, the radio frequency signal transmission module and the connection unit, and the switch module selects to transmit the first radio frequency signal to a first antenna unit, or transmit the first radio frequency signal or the second radio frequency signal to the connection unit according to the control of the first control module. The signal processing device according to claim 1, wherein the connecting unit is a radio frequency cable. The signal processing device according to claim 1, wherein the remote device includes: A filter module, coupled to the connection unit, receives the first radio frequency signal or the second radio frequency signal, and filters the first radio frequency signal or the second radio frequency signal to generate the filtered first radio frequency signal or the filtered second radio frequency signal; A detection module, coupled to the filter module, performs the power detection on the filtered first radio frequency signal to generate the detection signal; A second control module, coupled to the detection module, receives the detection signal, and generates the control signal according to the comparison result between the detection signal and the preset reference value; and A second control signal transmission module, coupled to the second control module and the connection unit, receives and transmits the control signal. The signal processing device according to claim 10, wherein the filter module includes: a third capacitor having a first end and a second end, the first end of the third capacitor is coupled to the connection unit; and A filter is coupled to the second end of the third capacitor and the detection module. The signal processing device according to claim 11, wherein the filter is a band-pass filter. The signal processing device according to claim 10, wherein the second control signal transmission module includes: a fourth capacitor having a first end and a second end, the first end of the fourth capacitor is coupled to the connection unit; and A second control signal transmission unit is coupled to the second terminal of the fourth capacitor and the second control module. The signal processing device according to claim 10, wherein the remote device further includes: a coupler, coupled between the filter module and the signal output module; and An attenuator is coupled between the coupler and the detection module. The signal processing device according to claim 10, wherein the remote device further includes: A second inductor has a first end and a second end, the first end of the second inductor is coupled to the connection unit, and the second end of the second inductor is coupled to a power signal. The signal processing device according to claim 10, wherein the remote device further adjusts the gain of the first radio frequency signal to generate a third radio frequency signal or output the second radio frequency signal according to the control signal. The signal processing device according to claim 16, wherein the remote device further includes: A signal output module, coupled to the filter module and the second control module, receives the filtered first radio frequency signal, and adjusts the gain of the first radio frequency signal according to the control signal to generate the third radio frequency signal, or receives the filtered second radio frequency signal and outputs the second radio frequency signal. Such as the signal processing device of claim 16, further comprising: A second antenna unit is coupled to the remote device, wherein the second antenna unit receives and transmits the second radio frequency signal or the third radio frequency signal.

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