CN109167635B - Multi-channel signal conversion device - Google Patents
Multi-channel signal conversion device Download PDFInfo
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- CN109167635B CN109167635B CN201811338810.2A CN201811338810A CN109167635B CN 109167635 B CN109167635 B CN 109167635B CN 201811338810 A CN201811338810 A CN 201811338810A CN 109167635 B CN109167635 B CN 109167635B
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The application relates to a multi-channel signal conversion device, which comprises a signal processing module and a modulation module. The signal processing module is used for processing the received multi-channel intermediate frequency electric signals and outputting the processed multi-channel intermediate frequency electric signals to the modulation module; and the modulation module is used for receiving the multi-channel external local oscillator electric signals and the processed multi-channel intermediate frequency electric signals, modulating the processed multi-channel intermediate frequency electric signals into multi-channel radio frequency electric signals and outputting the multi-channel radio frequency electric signals. The signal processing module is used for uniformly processing the received multiple paths of intermediate frequency electric signals and transmitting the processed multiple paths of intermediate frequency electric signals to the modulation module. The modulation module also receives a plurality of paths of external local oscillator electric signals, and modulates the processed plurality of paths of intermediate frequency electric signals into a plurality of paths of radio frequency electric signals to be output. A circuit module is not arranged for each path of signal independently, but a plurality of paths of signal processing modules and modulation modules which are processed in parallel are designed, so that the circuit integration level is higher, and the volume of the equipment is reduced.
Description
Technical Field
The invention relates to the technical field of electronic communication, in particular to a multi-channel signal conversion device.
Background
With the increasing demand of people on mobile internet and broadband data services, the optical fiber distribution system is popularized and applied in the field of mobile communication on a large scale by virtue of the characteristics of strong networking capability, wide coverage, low noise, low power consumption, convenience in debugging, low failure rate and the like. The optical fiber distribution system generally mainly comprises a near-end machine and a far-end machine and is used for deep coverage of mobile wireless communication signals. In order to integrate signal coverage of different communication operators, the optical fiber distribution system needs to support fusion of multiple frequency bands and multiple standards.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: in order to realize the integration of multiple frequency bands and multiple communication systems, the circuit design of the traditional light distribution system is formed by overlapping multiple completely independent links, so that the circuit size of a near-end machine and a far-end machine is large, and the integration level is not high.
Disclosure of Invention
Therefore, it is necessary to provide a multi-channel signal conversion device for solving the problems of large circuit size and low integration level of the near-end unit and the far-end unit in the conventional technology.
The embodiment of the invention provides a multi-channel signal conversion device, which comprises: the device comprises a signal processing module and a modulation module;
the signal processing module is used for processing the received multi-channel intermediate frequency electric signals and outputting the processed multi-channel intermediate frequency electric signals to the modulation module;
and the modulation module is used for receiving the multi-channel external local oscillator electric signals and the processed multi-channel intermediate frequency electric signals, modulating the processed multi-channel intermediate frequency electric signals into multi-channel radio frequency electric signals and outputting the multi-channel radio frequency electric signals.
In one embodiment, the signal processing module comprises an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit;
the analog-to-digital conversion unit is used for converting the received multi-channel intermediate frequency electric signals into multi-channel digital electric signals and sending the multi-channel digital electric signals to the signal processing unit;
the signal processing unit is used for processing the received multi-channel digital electric signals and outputting the processed multi-channel digital electric signals to the digital-to-analog conversion unit;
and the digital-to-analog conversion unit is used for converting the processed multi-channel digital electric signals into processed multi-channel intermediate frequency electric signals, sending the processed multi-channel intermediate frequency electric signals to the modulation module, and simultaneously outputting the processed multi-channel intermediate frequency electric signals.
In one embodiment, the device further comprises a photoelectric conversion module;
and the photoelectric conversion module is used for converting the received multipath optical signals into multipath digital electric signals, sending the multipath digital electric signals to the signal processing unit, converting the processed multipath digital electric signals output by the signal processing unit into multipath optical signals and outputting the multipath optical signals.
In one embodiment, the system further comprises an Ethernet signal conversion module;
the Ethernet signal conversion module is used for converting the received multipath Ethernet signals into multipath digital electric signals and sending the multipath digital electric signals to the signal processing unit, and is also used for converting the processed multipath digital electric signals output by the signal processing unit into multipath Ethernet signals and outputting the multipath Ethernet signals.
In one embodiment, the photoelectric conversion module includes a photoelectric conversion unit and an optical signal processing unit;
the photoelectric conversion unit is used for converting the received multi-channel optical signals into multi-channel high-speed serial electric signals and outputting the multi-channel high-speed serial electric signals to the optical signal processing unit, and is also used for converting the multi-channel high-speed serial electric signals output by the photoelectric processing unit into multi-channel optical signals and outputting the multi-channel optical signals;
and the optical signal processing unit is used for converting the multi-path high-speed serial electric signals output by the photoelectric conversion unit into multi-path digital electric signals and outputting the multi-path digital electric signals to the signal processing unit, and is also used for converting the processed multi-path digital electric signals output by the signal processing unit into multi-path high-speed serial electric signals and outputting the multi-path high-speed serial electric signals to the photoelectric conversion unit.
In one embodiment, the signal processing performed in the signal processing unit includes: digital signal interpolation, decimation, filtering, signal transformation, signal synthesis, or signal distribution.
In one embodiment, the modulation module is a unit with frequency conversion function.
In one embodiment, the ethernet signal conversion module includes a PHY unit.
In one embodiment, the signal processing unit comprises a unit having a signal processing function.
One of the above technical solutions has the following advantages and beneficial effects:
the multi-channel signal conversion device uniformly processes the received multi-channel intermediate frequency electric signals through the signal processing module and transmits the processed multi-channel intermediate frequency electric signals to the modulation module. The modulation module also receives a plurality of paths of external local oscillator electric signals, and modulates the processed plurality of paths of intermediate frequency electric signals into a plurality of paths of radio frequency electric signals to be output. A circuit module is not arranged for each path of signal independently, but a plurality of paths of signal processing modules and modulation modules which are processed in parallel are designed, so that the circuit integration level is higher, and the volume of the equipment is reduced.
Drawings
FIG. 1 is a block diagram of a multi-channel signal conversion apparatus according to an embodiment;
FIG. 2 is a block diagram of another embodiment of a multi-channel signal conversion apparatus;
FIG. 3 is a diagram illustrating a first application of the multi-channel signal conversion apparatus according to an embodiment;
FIG. 4 is a diagram illustrating a second application of the multi-channel signal conversion apparatus according to an embodiment;
fig. 5 is a third application diagram of the multi-channel signal conversion apparatus in an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The traditional light distribution system compatible with multiple frequency bands and multiple communication systems is composed of multiple independently designed radio frequency channel circuits, wherein one part of radio frequency channels are used for processing signals of one communication system or frequency band, and the other part of radio frequency channels are used for processing signals of the other communication system or frequency band. Communication systems (e.g., LTE, TD-LTE, etc.) that use MIMO technology for signal transmission require more radio frequency channels than other communication systems. Thus, the circuitry for both the near-end and far-end machines of the light distribution system is very bulky.
On the other hand, the conventional optical fiber distribution system needs to determine the communication system and frequency band processed by the system before the system is built, and design a corresponding near-end unit and a corresponding far-end unit. In this way, the circuits in the near-end unit and the far-end unit are fixed at the time of design, and then, if the functions are to be changed or expanded, redesign is required, and flexibility and adaptability are not high enough.
An embodiment of the present invention provides a multi-channel signal conversion apparatus 10, as shown in fig. 1, including: a signal processing module 110 and a modulation module 120.
The signal processing module 110 is configured to process the received multiple intermediate frequency electrical signals and output the processed multiple intermediate frequency electrical signals to the modulation module 120. And a modulation module 120, configured to receive the multiple external local oscillator electrical signals LO and the processed multiple intermediate frequency electrical signals, modulate the processed multiple intermediate frequency electrical signals into multiple radio frequency electrical signals, and output the multiple radio frequency electrical signals.
Specifically, the signal processing module 110 receives multiple paths of intermediate frequency electrical signals, performs signal processing on each path of intermediate frequency electrical signal, and outputs each path of processed intermediate frequency electrical signal to the modulation module 120. The modulation module 120 receives each processed intermediate frequency electrical signal, and receives multiple external local oscillator electrical signals LO corresponding to the processed intermediate frequency electrical signal. The modulation module 120 modulates any processed intermediate-frequency electrical signal into a radio-frequency electrical signal according to the intermediate-frequency electrical signal and an external local oscillator electrical signal LO corresponding to the intermediate-frequency electrical signal, and outputs the radio-frequency electrical signal.
Here, the Intermediate Frequency (IF) signal refers to a signal obtained by Frequency-converting a high Frequency signal. The frequency band of the intermediate frequency is relative to the frequency of the baseband signal and the frequency of the radio frequency signal in the communication system in which it is used. In the present application, the center frequency of the intermediate frequency electrical signal may be 81.44MHz, 204.32MHz, 287.2MHz, or the like.
The multi-channel signal conversion apparatus 10 provided in this embodiment performs signal processing on the received multiple intermediate frequency electrical signals in a unified manner through the signal processing module 110, and transmits the processed multiple intermediate frequency electrical signals to the modulation module 120. The modulation module 120 further receives multiple external local oscillator electrical signals LO, and modulates the processed multiple intermediate frequency electrical signals into multiple radio frequency electrical signals for output. In the embodiment, a circuit module is not separately arranged for each path of signal, but a plurality of paths of signal processing modules 110 and modulation modules 120 which are processed in parallel are designed, so that the circuit integration level is higher, and the volume of the device is reduced.
In one embodiment, the signal processing module 110 is provided with a plurality of first type ports and a plurality of second type ports. The first type of port is an electric signal input port and is used for inputting a plurality of paths of intermediate frequency electric signals. The second type of port is an electric signal output port and is used for outputting the processed multi-channel intermediate frequency electric signals. The modulation module 120 is provided with a plurality of third type ports, a plurality of fourth type ports and a plurality of fifth type ports. The third port is used for inputting the processed multi-channel intermediate frequency electric signals, the fourth port is used for inputting the multi-channel external local oscillation electric signals LO, and the fifth port is used for outputting the multi-channel radio frequency electric signals.
Wherein the frequency band of each external radio frequency electrical signal is adjustable. The frequency band of each external radio frequency electric signal is in the frequency band of the target communication system. The target communication system is set by a technician according to the system requirements. The target communication system may be preset before the multichannel signal conversion apparatus 10 is put into use, or may be adjusted by a technician according to a change in communication demand after the multichannel signal conversion apparatus 10 is put into use. After the multi-channel signal conversion apparatus 10 provided in this embodiment is put into use, the frequency band of the external local oscillator electrical signal LO may also be changed to adjust the system-compatible communication system, so that the flexibility and the adaptability are better.
In one embodiment, as shown in fig. 2, the signal processing module 110 includes an analog-to-digital conversion unit 111, a signal processing unit 112, and a digital-to-analog conversion unit 113.
The analog-to-digital conversion unit 111 is configured to convert the received multiple intermediate frequency electrical signals into multiple digital electrical signals, and send the multiple digital electrical signals to the signal processing unit 112.
The signal processing unit 112 is configured to process the received multiple paths of digital electrical signals, and output the processed multiple paths of digital electrical signals to the digital-to-analog conversion unit 113.
The digital-to-analog conversion unit 113 is configured to convert the processed multiple paths of digital electrical signals into processed multiple paths of intermediate frequency electrical signals, send the processed multiple paths of intermediate frequency electrical signals to the modulation module 120, and output the processed multiple paths of intermediate frequency electrical signals at the same time.
Specifically, the analog-to-digital conversion unit 111 receives multiple paths of intermediate frequency electrical signals, respectively converts each path of intermediate frequency electrical signal into a path of digital electrical signal, and outputs the multiple paths of digital electrical signals to the signal processing unit 112. The signal processing unit 112 performs signal processing on each of the channels of digital electrical signals, and outputs the processed channels of digital electrical signals to the digital-to-analog conversion unit 113. The digital-to-analog conversion unit 113 converts each processed digital electrical signal into a processed intermediate frequency electrical signal, and outputs the processed multiple intermediate frequency electrical signals to the modulation module 120 and other external circuits.
In one embodiment, the analog-to-digital conversion unit 111 is provided with a plurality of sixth type ports and a plurality of seventh type ports, where the sixth type ports are input ports and the seventh type ports are output ports. The signal processing unit 112 is provided with a plurality of eighth ports and ninth ports, where the eighth ports are used for inputting multiple digital electrical signals, and the ninth ports are used for outputting multiple processed digital electrical signals. The digital-to-analog conversion unit 113 is provided with a plurality of tenth type ports, eleventh type ports and twelfth type ports. The tenth port is configured to input the processed multiple digital electrical signals, the eleventh port is configured to output the processed multiple intermediate frequency electrical signals to the modulation module 120, and the twelfth port is configured to output the processed multiple intermediate frequency electrical signals to other external circuits.
In one embodiment, the multichannel signal conversion device 10 further includes a photoelectric conversion module 130.
The optical-to-electrical conversion module 130 is configured to convert the received multiple optical signals into multiple digital electrical signals, send the multiple digital electrical signals to the signal processing unit 112, convert the processed multiple digital electrical signals output by the signal processing unit 112 into multiple optical signals, and output the multiple optical signals.
Specifically, the photoelectric conversion module 130 converts the multiple optical signals into multiple digital electrical signals and outputs the multiple digital electrical signals to the signal processing unit 112. The signal processing unit 112 receives the multiple paths of digital electrical signals sent by the photoelectric conversion module 130 or the multiple paths of digital electrical signals sent by the analog-to-digital conversion unit 111, performs signal processing on each path of digital electrical signal, and outputs the processed multiple paths of digital electrical signals to the digital-to-analog conversion unit 113 and the photoelectric conversion module 130, respectively. The digital-to-analog conversion unit 113 converts the processed multiple digital electrical signals into processed multiple intermediate frequency electrical signals, and outputs the processed multiple intermediate frequency electrical signals to the modulation module 120 or other external circuits, respectively. The signal modulated by the modulation module 120 becomes a radio frequency electrical signal and is output. The photoelectric conversion module 130 converts the processed multiple paths of digital electrical signals into multiple paths of optical signals and outputs the multiple paths of optical signals. The multi-channel signal conversion apparatus 10 provided in this embodiment can receive multiple intermediate frequency electrical signals or multiple optical signals at will, and convert the received multiple intermediate frequency electrical signals or multiple radio frequency electrical signals into multiple processed intermediate frequency electrical signals, multiple processed radio frequency electrical signals, and multiple processed optical signals for output. The rate of the multi-channel optical signal received by the photoelectric conversion module 130 may be 1.5Gbps, 2.5Gbps, 6.25Gbps, 10Gbps or 40 Gbps.
In one embodiment, as shown in fig. 2, the multichannel signal conversion apparatus 10 further includes an ethernet signal conversion module 140.
The ethernet signal conversion module 140 is configured to convert the received multiple paths of ethernet signals into multiple paths of digital electrical signals, send the multiple paths of digital electrical signals to the signal processing unit 112, and convert the processed multiple paths of digital electrical signals output by the signal processing unit 112 into multiple paths of ethernet signals, and output multiple paths of ethernet signals.
Specifically, when receiving the multiple ethernet signals, the ethernet signal conversion module 140 converts the multiple ethernet signals into multiple digital electrical signals and outputs the multiple digital electrical signals to the signal processing unit 112. The signal processing unit 112 receives the multiple paths of digital electrical signals sent by the ethernet signal conversion module 140, the multiple paths of digital electrical signals sent by the photoelectric conversion module 130, or the multiple paths of digital electrical signals sent by the analog-to-digital conversion unit 111, performs signal processing on each path of digital electrical signal, and outputs the processed multiple paths of digital electrical signals to the ethernet signal conversion module 140, the digital-to-analog conversion unit 113, and the photoelectric conversion module 130, respectively. The ethernet signal conversion module 140 converts the processed multiple digital electrical signals into ethernet signals for output. The digital-to-analog conversion unit 113 converts the processed multiple paths of digital electrical signals into processed intermediate frequency electrical signals, and outputs the processed intermediate frequency electrical signals to other external circuits and the modulation module 120, respectively. The modulation module 120 modulates the processed multiple intermediate frequency electrical signals and outputs multiple radio frequency electrical signals. The photoelectric conversion module 130 converts the processed multiple paths of digital electrical signals into multiple paths of optical signals for output. The multi-channel signal conversion apparatus 10 provided in this embodiment can receive one of the multiple intermediate frequency electrical signals, the multiple optical signals, and the multiple ethernet signals at will, and convert the received signal into the multiple ethernet signals, the processed multiple intermediate frequency electrical signals, the processed multiple radio frequency electrical signals, and the multiple optical signals for output.
In one embodiment, as shown in fig. 2, the photoelectric conversion module 130 includes a photoelectric conversion unit 131 and an optical signal processing unit 132.
The photoelectric conversion unit 131 is configured to convert the received multiple paths of optical signals into multiple paths of high-speed serial electrical signals, output the multiple paths of high-speed serial electrical signals to the optical signal processing unit 132, and convert the multiple paths of high-speed serial electrical signals output by the photoelectric processing unit into multiple paths of optical signals, and output the multiple paths of optical signals. The optical signal processing unit 132 is configured to convert the multiple high-speed serial electrical signals output by the photoelectric conversion unit 131 into multiple digital electrical signals and output the multiple digital electrical signals to the signal processing unit 112, and is further configured to convert the processed multiple digital electrical signals output by the signal processing unit 112 into multiple high-speed serial electrical signals and output the multiple high-speed serial electrical signals to the photoelectric conversion unit 131.
In one embodiment, the signal processing performed in the signal processing unit 112 includes: digital signal interpolation, decimation, filtering, signal transformation, signal synthesis, or signal distribution. In other embodiments, the signal processing performed in the signal processing unit 112 includes a combination of one or more of digital signal interpolation, decimation, filtering, signal transformation, signal synthesis, or signal distribution.
In a specific embodiment, the components of the multiple channel signal conversion apparatus 10 are laid on a PCB board, and include: the analog-to-digital conversion unit 111, the digital-to-analog conversion unit 113, the signal processing unit 112, the ethernet signal conversion module 140, the photoelectric conversion module 130, and the photoelectric conversion module 130 are provided with optical fiber interfaces (OP1, OP2, … OPn), a monitoring unit, a power supply unit, a clock unit, control ports (CTR1, CTR2, … CTRn), a trigger output signal (T1 … Tn), and a trigger input signal (T _ in1 … T _ inN).
In a specific implementation, the multiple intermediate frequency electrical signals from the outside need to be synchronized with the multiple synchronous reference signals generated by itself or received from the outside in the conversion apparatus 10, and then input to the analog-to-digital conversion unit 111 after the clock unit is synchronized. Similarly, the plurality of external local oscillator signals LO also need to be input to the modulation module 120 after the clock unit synchronizes with the plurality of synchronous reference signals. The sampling rate of the analog-to-digital conversion unit 111 may be adjusted according to the relationship between the center frequency and the bandwidth of the plurality of intermediate frequency electrical signals, and may be 491.52MSPS, for example. The fiber interface can support multiple rates including 10Gbps and 6.25 Gbps. The transmission distance of the optical fiber interface can adopt equal distance of 1km, 5km, 10km, 20km and 40 km. The ethernet signal may be a hundred megabyte, gigabyte, or ten-gigabit ethernet signal.
The multi-channel signal conversion device 10 provided by the embodiment has high integration level and small size. The multi-channel signal conversion device 10 provided in this embodiment simultaneously realizes conversion of multiple signals, can realize free and flexible conversion in multiple communication systems, and can realize combination of any frequency band and any system. The embodiment simultaneously realizes a plurality of Ethernet ports and supports ten-gigabit Ethernet ports. Moreover, a plurality of optical fiber interfaces are simultaneously realized, and data transmission of the plurality of optical fiber interfaces is supported.
In one embodiment, the modulation module 120 is a unit with frequency conversion function. Further, the modulation module 120 may employ a mixer. Preferably, the modulation module 120 is a quadrature modulator. In another embodiment, the modulation scheme of the modulation module 120 is a real modulation scheme.
In one embodiment, the ethernet signal conversion module 140 includes a PHY unit. The PHY unit is a unit having a PHY function. Preferably, the PHY unit may be a VSC8552 chip.
In one embodiment, the signal processing unit 112 includes a unit having a signal processing function. Further, the signal processing unit 112 may be a DSP unit, an FPGA unit, or an SOPC unit.
The multi-channel signal conversion device 10 provided by the embodiment of the invention can be applied to circuits of communication systems such as a near-end machine of an optical fiber repeater, a far-end machine of the optical fiber repeater or a wireless repeater. Fig. 3 is a schematic diagram of the application of the multi-channel signal conversion apparatus 10 in a near-end of a fiber optic repeater. Fig. 4 is a schematic diagram of the application of the multi-channel signal conversion apparatus 10 in a remote unit of a fiber-optic repeater. Fig. 5 is a schematic diagram of the application of the multipath signal conversion device 10 in a wireless repeater. Wherein, LO is an external local oscillator electrical signal LO, IF is an intermediate frequency electrical signal, RF is a radio frequency electrical signal, and REF is a synchronous reference signal.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A multi-channel signal conversion apparatus, comprising: the multi-channel parallel processing signal processing module and the modulation module;
the signal processing module is used for processing the received multiple paths of arbitrary intermediate frequency electric signals and outputting the processed multiple paths of intermediate frequency electric signals to the modulation module;
the modulation module is used for receiving a plurality of paths of any external local oscillator electric signals and a plurality of processed intermediate frequency electric signals, modulating the plurality of processed intermediate frequency electric signals into a plurality of paths of any radio frequency electric signals, and outputting the plurality of paths of any radio frequency electric signals; the frequency bands of the plurality of radio frequency electric signals are adjustable;
the signal processing module comprises an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit;
the analog-to-digital conversion unit is used for converting the received multiple paths of arbitrary intermediate frequency electric signals into multiple paths of digital electric signals and sending the multiple paths of digital electric signals to the signal processing unit, and the sampling rate of the analog-to-digital conversion unit is adjusted according to the relation between the central frequency and the bandwidth of the multiple paths of arbitrary intermediate frequency electric signals;
the signal processing unit is used for processing the received multiple paths of digital electric signals and outputting the processed multiple paths of digital electric signals to the digital-to-analog conversion unit; the signal processing performed in the signal processing unit includes: part or all of the functions of interpolation, extraction, filtering, digital signal conversion, digital signal synthesis or digital signal distribution of the digital domain signals are completed in the digital domain;
the digital-to-analog conversion unit is used for converting the processed multiple paths of digital electric signals into processed multiple paths of intermediate frequency electric signals and sending the processed multiple paths of intermediate frequency electric signals to the modulation module;
the analog-to-digital conversion unit, the signal processing unit, the digital-to-analog conversion unit and the modulation module are all laid on the same PCB.
2. The multi-channel signal conversion device of claim 1, further comprising a photoelectric conversion module;
the photoelectric conversion module is used for converting the received multipath optical signals into multipath digital electric signals and sending the multipath digital electric signals to the signal processing unit, and is also used for converting the processed multipath digital electric signals output by the signal processing unit into multipath optical signals and outputting the multipath optical signals.
3. The multi-channel signal conversion device of claim 2, further comprising an ethernet signal conversion module;
the Ethernet signal conversion module is used for converting the received multiple paths of Ethernet signals into multiple paths of digital electric signals, sending the multiple paths of digital electric signals to the signal processing unit, converting the processed multiple paths of digital electric signals output by the signal processing unit into multiple paths of Ethernet signals and outputting the multiple paths of Ethernet signals.
4. The multi-channel signal conversion device of claim 3, wherein the photoelectric conversion module comprises a photoelectric conversion unit and an optical signal processing unit;
the photoelectric conversion unit is used for converting the received multiple paths of optical signals into multiple paths of high-speed serial electric signals and outputting the multiple paths of high-speed serial electric signals to the optical signal processing unit, and is also used for converting the multiple paths of high-speed serial electric signals output by the photoelectric processing unit into multiple paths of optical signals and outputting multiple paths of optical signals;
the optical signal processing unit is used for converting the plurality of high-speed serial electric signals output by the photoelectric conversion unit into a plurality of digital electric signals and outputting the plurality of digital electric signals to the signal processing unit, and is also used for converting the plurality of processed digital electric signals output by the signal processing unit into a plurality of high-speed serial electric signals and outputting the plurality of high-speed serial electric signals to the photoelectric conversion unit.
5. The multi-channel signal conversion device of claim 4, wherein the modulation module is a unit with frequency conversion function.
6. The multi-channel signal conversion device of claim 5, wherein the Ethernet signal conversion module comprises a PHY unit.
7. The multi-channel signal conversion device of claim 6, wherein the signal processing unit comprises a unit having a signal processing function.
8. The multi-channel signal conversion device of claim 7, wherein the signal processing unit is a DSP unit, an FPGA unit, or an SOPC unit.
9. The multi-channel signal conversion device of claim 1 wherein the modulation module is a mixer; the modulation mode of the modulation module is a real modulation mode.
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