WO2023124112A1 - Base station and communication system - Google Patents

Abstract

The present application relates to a base station and a communication system. The base station comprises an extension unit, a photoelectric conversion unit, and a remote unit, wherein the photoelectric conversion unit is connected to the extension unit and is used for being connected to the remote unit by means of an optical fiber; the extension unit is used for converting a downlink baseband signal into a downlink millimeter-wave signal; the photoelectric conversion unit is used for directly modulating the downlink millimeter-wave signal to a downlink optical carrier, so as to convert the downlink millimeter-wave signal into a downlink optical signal; the remote unit is used for converting the downlink optical signal into the downlink millimeter-wave signal; the remote unit is used for receiving an uplink millimeter-wave signal and directly modulating the uplink millimeter-wave signal to an uplink optical carrier, so as to convert the uplink millimeter-wave signal into an uplink optical signal; the photoelectric conversion unit is used for converting the uplink optical signal into the uplink millimeter-wave signal; and the extension unit is used for converting the uplink millimeter-wave signal into an uplink baseband signal. The base station in the present application can simultaneously meet the requirements of large bandwidth, long-distance transmission and low cost.

Description

Base Station and Communication System

This application refers to the Chinese patent application No. 202111679615.8 entitled "Base Station and Communication System" submitted on December 31, 2021, which is incorporated by reference into this application in its entirety.

technical field

The present application relates to the technical field of wireless communication, in particular to a base station and a communication system.

Background technique

With the commercial promotion of 5G communication networks, the surge of user data traffic services urgently requires mobile communication systems to further improve the coverage and system capacity of the system. Since the large-scale application of 5G (5th Generation Mobile Communication Technology) base stations can further improve system capacity and coverage capabilities, it has become an important means to solve the aforementioned problems. However, it is difficult for traditional technologies to simultaneously meet the requirements of large bandwidth, long-distance transmission and low cost when implementing 5G base stations.

Contents of the invention

Based on this, it is necessary to provide a base station and a communication system that can simultaneously meet the requirements of large bandwidth, long-distance transmission and low cost.

In a first aspect, an embodiment of the present application provides a base station, where the base station includes an extension unit, a photoelectric conversion unit, and a remote unit. Wherein, the photoelectric conversion unit is connected to the extension unit, and is used to connect to the remote unit through an optical fiber.

The extension unit is used to convert the downlink baseband signal into a downlink millimeter wave signal; the photoelectric conversion unit is used to directly modulate the downlink millimeter wave signal onto a downlink optical carrier to convert the downlink millimeter wave signal into a downlink optical signal ; The remote unit is used to convert the downlink optical signal into a downlink millimeter wave signal.

The remote unit is used to receive the uplink millimeter wave signal and directly modulate the uplink millimeter wave signal onto the uplink optical carrier to convert the uplink millimeter wave signal into an uplink optical signal; the photoelectric conversion unit is used to convert the uplink optical signal into an uplink millimeter wave signal. wave signal; the extension unit is used to convert the uplink millimeter wave signal into an uplink baseband signal.

In a second aspect, an embodiment of the present application provides a communication system, including an optical fiber and the foregoing base station.

In the above-mentioned base station and communication system, by using the millimeter wave frequency band for communication, a higher 5G bandwidth can be realized to meet the large bandwidth requirement of the base station. When the extension unit and the remote unit perform downlink communication, the photoelectric conversion unit can directly modulate the downlink millimeter-wave signal output by the extension unit onto the downlink optical carrier, and output the modulated downlink optical signal to the remote unit, so that the remote The unit can directly obtain the downlink millimeter wave signal from the downlink optical carrier. When the extension unit communicates uplink with the remote unit, the remote unit can directly modulate the received uplink millimeter-wave signal onto the uplink optical carrier, and output the modulated uplink optical signal to the extension unit, so that the extension unit can directly Obtain an uplink millimeter wave signal from an uplink optical carrier. In this way, the radio frequency signal between the expansion unit and the remote unit can be transparently transmitted and extended, and the remote unit is not required to perform operations such as mode locking, digital signal processing, digital-to-analog conversion, and frequency conversion, which greatly simplifies the design complexity of the remote unit and The hardware structure can meet the low-cost requirements, and it is also conducive to the finalization of the design and mass production of the base station. In the present application, the transmission of uplink and downlink optical signals is realized by means of optical fiber extension, which greatly reduces signal loss, thereby greatly increasing the transmission distance. At the same time, the transmission bandwidth of optical fiber extension is high, for example, it can achieve a transmission bandwidth of up to 12GHz, which can take into account the requirements of large bandwidth, long-distance transmission and low cost at the same time, which is conducive to the large-scale networking application of millimeter wave base stations.

Description of drawings

FIG. 1 is one of the schematic structural block diagrams of a base station in an embodiment of the present application;

FIG. 2 is the second schematic structural block diagram of the base station in the embodiment of the present application;

FIG. 3 is a third schematic structural block diagram of a base station in an embodiment of the present application;

Fig. 4 is a schematic structural block diagram of a photoelectric conversion unit in an embodiment of the present application;

FIG. 5 is one of the schematic structural block diagrams of the remote unit in the embodiment of the present application;

FIG. 6 is the second schematic structural block diagram of the remote unit in the embodiment of the present application;

FIG. 7 is the third schematic structural block diagram of the remote unit in the embodiment of the present application;

FIG. 8 is one of the schematic structural block diagrams of the extension unit in the embodiment of the present application;

FIG. 9 is the second schematic structural block diagram of the extension unit in the embodiment of the present application;

Fig. 10 is the third schematic structural block diagram of the extension unit in the embodiment of the present application;

FIG. 11 is a fourth schematic structural block diagram of a base station in an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

The serial numbers assigned to components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application all include direct and indirect connection (connection) unless otherwise specified.

The existing technology has the following technical difficulties when realizing the large-scale application of 5G millimeter wave base stations: first, it is difficult to realize large bandwidth, long distance and multi-channel transmission between the central station and the remote unit; second, it is difficult to reduce the number of remote terminals. Unit complexity and cost. For the aforementioned two technical difficulties, none of the existing technologies has proposed an effective solution to simultaneously realize the aforementioned two requirements.

Existing technologies are generally implemented in the following ways:

(1) Adopt sub-6G frequency band design. For example, use 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project) N41 and N78 frequency bands for communication. However, this implementation method cannot realize the bandwidth of 400MHz/800MHz, and it is difficult to meet the requirement of large bandwidth. At the same time, if the sub-6G frequency band is used for communication, the relative bandwidth needs to be achieved by about 20%, which makes it difficult to implement power amplifiers and filter devices, and there are no sufficient spectrum resources available in the sub-6G frequency band.

(2) Use millimeter wave signals for wireless relay to achieve 5G target throughput and indoor and outdoor signal transmission. However, in the millimeter-wave frequency band, the transmission of electromagnetic waves has a large attenuation, and the millimeter-wave signal will suffer a very large loss when penetrating obstacles, making it impossible to achieve long-distance transmission. For example, when a millimeter wave signal encounters common building materials, the attenuation can reach more than 100dB. Therefore, in order to ensure full coverage of signals, adopting this implementation method will lead to an increase in the number of antennas required by the entire communication system, thereby increasing the cost. At the same time, the way of wireless relay still has the problem of narrow transmission bandwidth. If it is realized by means of cable and wireless transmission, there will be problems of high cost and large transmission loss, which is not conducive to the large-scale application of 5G millimeter wave base stations.

(3) Adopt traditional digital optical fiber transmission mode to realize. Since the central station needs to be connected to the remote units of the number of terminals, if digital signal transmission is adopted, signal processing, analog-to-digital conversion, and frequency conversion must be completed at the remote units, resulting in high design complexity and cost for the remote units. greatly increase.

At the same time, due to the large spatial attenuation of wireless signals in the millimeter wave frequency band, compared with the sub-6G frequency band, under the same transmission power, the coverage of wireless signals in the millimeter wave frequency band will be much smaller than the coverage of wireless signals in the sub-6G frequency band. . Therefore, in order to achieve a considerable coverage effect, it is necessary to configure a large number of remote units, which further increases the cost and further increases the difficulty of large-scale networking.

In order to solve the foregoing problems, the present application provides a base station and a communication system, which can simultaneously meet the requirements of large bandwidth, long-distance transmission and low cost.

As shown in FIG. 1 , in an embodiment, the present application provides a base station. The base station includes an extension unit 100 , a photoelectric conversion unit 200 and at least one remote unit 300 connected in sequence. Specifically, the photoelectric conversion unit 200 is used to connect to the remote unit 300 through an optical fiber 400 .

Wherein, the extension unit 100 refers to a unit capable of converting baseband signals and radio frequency signals into each other, which can convert baseband signals into radio frequency signals, or convert radio frequency signals into baseband signals. The photoelectric conversion unit 200 refers to a unit capable of completing photoelectric conversion and electro-optical conversion, that is, the photoelectric conversion unit 200 can convert an electrical signal into an optical signal, and can convert an optical signal into an electrical signal. The remote unit 300 refers to a unit for implementing signal coverage. It can be understood that the specific numbers of extension units 100, photoelectric conversion units 200, and remote units 300 can be determined according to actual conditions (such as signal coverage, coverage area distribution, etc.), and this application does not make specific limitations on this. In an example, the number of remote units 300 connected to the same extension unit 100 may be less than or equal to 8, that is, one extension unit 100 may be connected to a maximum of 8 remote units 300 to ensure communication quality.

During downlink communication, the extension unit 100 is used to convert the downlink baseband signal into a downlink millimeter wave signal, and output the downlink millimeter wave signal to the photoelectric conversion unit 200 . Wherein, the downlink millimeter wave signal is a downlink electrical signal in a millimeter wave frequency band. The photoelectric conversion unit 200 is used to directly modulate the downlink millimeter wave signal onto a downlink optical carrier to realize electro-optical conversion and obtain a downlink optical signal. The remote unit 300 can receive the downlink optical signal output by the photoelectric conversion unit 200 through the optical fiber 400, and directly demodulate the downlink optical signal to obtain a downlink millimeter wave signal, so as to complete signal coverage through the downlink millimeter wave signal. In one embodiment, the remote unit 300 may directly transmit the downlink millimeter wave signal, or output the downlink millimeter wave signal to a device or device independent of the remote unit 300 to implement signal transmission.

When performing uplink communication, the remote unit 300 may receive uplink millimeter wave signals through the unit or other devices independent of the unit. Wherein, the uplink millimeter wave signal is an uplink electrical signal in a millimeter wave frequency band. When receiving the uplink millimeter-wave signal, the remote unit 300 may directly modulate the uplink millimeter-wave signal onto an uplink optical carrier to implement electro-optical conversion and obtain an uplink optical signal. The photoelectric conversion unit 200 can receive the uplink optical signal output by the remote unit 300 through the optical fiber 400, and convert the uplink optical signal into an uplink millimeter wave signal. The extension unit 100 can convert the uplink millimeter wave signal into an uplink baseband signal, and output the uplink baseband signal to a next-level device to complete uplink communication.

In the present application, in the first aspect, a millimeter wave frequency band is used to realize communication, so that a higher 5G bandwidth can be realized, for example, a bandwidth of 400MHz or 800MHz can be realized. In the second aspect, optical fiber remote transmission is adopted instead of millimeter wave wireless transmission, and the interconnection transmission between the central station (that is, the extension unit 100) and the remote unit 300 is realized through millimeter wave ROF (Radio Over Fiber, wireless communication over light) technology . Compared with the millimeter wave wireless transmission method, the attenuation of the long-distance optical fiber link is small, which can greatly reduce the signal loss, thereby achieving a longer transmission distance, and the long-distance optical fiber can achieve a wider transmission bandwidth. For example, the transmission bandwidth can be up to 12GHz. In the third aspect, millimeter-wave ROF (Radio Over Fiber, wireless communication over optical) technology is used to realize the transparent transmission of radio frequency signals between the extension unit 100 and the remote unit 300. Compared with the traditional digital optical fiber remote unit 300, The remote unit 300 of the present application does not need to implement digital signal processing, digital-to-analog conversion, and frequency conversion, which greatly simplifies the hardware design and design complexity of the remote unit 300, and is more conducive to product design and mass production. Therefore, the base station of the present application can realize the large bandwidth and long-distance transmission required for millimeter-wave 5G communication at the same time, and simplifies the design complexity and hardware structure of the remote unit 300, which can reduce the cost of the base station and is conducive to the development of 5G millimeter-wave base stations. Large-scale networking applications.

In the above-mentioned base stations, by using the millimeter wave frequency band for communication, higher 5G bandwidth can be achieved to meet the large bandwidth requirements of the base station. When the extension unit 100 performs downlink communication with the remote unit 300, the photoelectric conversion unit 200 can directly modulate the downlink millimeter-wave signal output by the extension unit 100 onto a downlink optical carrier, and output the modulated downlink optical signal to the remote unit 300, so that the remote unit 300 can directly obtain a downlink millimeter wave signal from a downlink optical carrier. When the extension unit 100 performs uplink communication with the remote unit 300, the remote unit 300 can directly modulate the received uplink millimeter-wave signal onto the uplink optical carrier, and output the modulated uplink optical signal to the extension unit 100, so that The extension unit 100 can directly obtain an uplink millimeter wave signal from an uplink optical carrier. In this way, the radio frequency signal between the extension unit 100 and the remote unit 300 can be transparently transmitted and extended, and the remote unit 300 is not required to perform operations such as mode locking, digital signal processing, digital-to-analog conversion, and frequency conversion, which greatly simplifies the operation of the remote unit 300. The design complexity and hardware structure can meet the low-cost requirements, and it is also conducive to the finalization of the design and mass production of the base station. In the present application, the transmission of uplink and downlink optical signals is realized by means of optical fiber extension, which greatly reduces signal loss, thereby greatly increasing the transmission distance. At the same time, the transmission bandwidth of optical fiber extension is high, for example, it can achieve a transmission bandwidth of up to 12GHz, which can take into account the requirements of large bandwidth, long-distance transmission and low cost at the same time, which is conducive to the large-scale networking application of millimeter wave base stations.

In one embodiment, as shown in FIG. 2 , the base station further includes an antenna 500 . The extension unit 100 includes a first signal processing module 130 , and the first signal processing module 130 includes one or more first uplink signal processing circuits 133 and a plurality of first downlink signal processing circuits 131 . The photoelectric conversion unit 200 includes a first wavelength division multiplexer 210 , a first photoelectric conversion module 220 and a first electro-optical conversion module 230 , and the first electro-optic conversion module 230 includes a plurality of first electro-optical converters 231 . The remote unit 300 includes a second wavelength division multiplexer 310 , a second photoelectric conversion module 320 and a second electro-optical conversion module 330 , and the second photoelectric conversion module 320 includes a plurality of second photoelectric converters 321 .

The first uplink signal processing circuit 133 is connected to the first photoelectric conversion module 220 , and each first downlink signal processing circuit 131 is connected to each first electro-optic converter 231 in a one-to-one correspondence. The first photoelectric conversion module 220 and each of the first electro-optical converters 231 are connected to the first wavelength division multiplexer 210 , and the first wavelength division multiplexer 210 is used to connect to the second wavelength division multiplexer 310 through the optical fiber 400 . The second wavelength division multiplexer 310 is respectively connected to the second electro-optic conversion module 330 and each second photoelectric converter 321 , and the second electro-optic conversion module 330 and each second photoelectric converter 321 are connected to the antenna 500 .

Specifically, each first downlink signal processing circuit 131 constitutes a transmission channel, and multiple first downlink signal processing circuits 131 are provided in the base station, thereby realizing a base station with multiple transmission channels. Any two transmit channels may correspond to downlink millimeter wave signals in the same or different frequency bands.

Wherein, the downlink millimeter-wave signals of different transmission channels may be electro-optical converted by different first electro-optical converters 231 . Different first electro-optical converters 231 of the same photoelectric conversion unit 200 can output downlink optical signals of different wavelengths. That is, after electro-optic conversion is performed on the downlink millimeter wave signals of different transmission channels, the downlink optical signals corresponding to the downlink millimeter wave signals of each transmission channel have different wavelengths. The downlink optical signals with different wavelengths can be photoelectrically converted by different second photoelectric converters 321, so as to obtain downlink millimeter wave signals of corresponding frequency bands from the downlink optical signals.

When performing downlink communication, the expansion unit 100 can output downlink millimeter wave signals to the corresponding first electro-optic converters 231 through each first downlink signal processing circuit 131, so that the downlink millimeter wave signals can be transmitted through the corresponding first electro-optic converters 231. The signal is converted into a downlink optical signal of the corresponding wavelength. Specifically, each first electro-optic converter 231 may directly modulate the received downlink millimeter wave signal onto a downlink optical carrier to obtain a downlink optical signal of a corresponding wavelength when receiving a downlink millimeter wave signal.

The first wavelength division multiplexer 210 is used for combining multiple downlink optical signals with different wavelengths, and performing power division for multiple uplink optical signals with different wavelengths. The second wavelength division multiplexer 310 is used for performing power division on multiple downlink optical signals with different wavelengths, and combining multiple uplink optical signals with different wavelengths.

The first wavelength division multiplexer 210 can combine the downlink optical signals output by the first electro-optic converters 231 , and output the combined downlink optical signals to the second wavelength division multiplexer 310 through the optical fiber 400 . The second wavelength division multiplexer 310 is used to split the beam-combined downlink optical signals, so as to obtain multiple downlink optical signals with different wavelengths from the beam-combined downlink optical signals, and wavelength, output each downlink optical signal to the corresponding second photoelectric converter 321 respectively. Each second photoelectric converter 321, when receiving a downlink optical signal, performs photoelectric conversion on the downlink optical signal to obtain a downlink millimeter wave signal, and outputs the downlink millimeter wave signal to the antenna 500 to achieve The signal is transmitted to complete the downlink communication.

When performing uplink communication, the second electro-optical conversion module 330 can receive the uplink millimeter wave signal through the antenna 500, and directly modulate the uplink millimeter wave signal onto the uplink optical carrier to obtain and output the uplink optical signal. The uplink optical signal may be sequentially transmitted through the second wavelength division multiplexer 310 , the optical fiber 400 and the first wavelength division multiplexer 210 to the first photoelectric conversion module 220 . The first photoelectric conversion module 220 is used to perform photoelectric conversion to convert the uplink optical signal into an uplink millimeter wave signal, and output the uplink millimeter wave signal to the first uplink signal processing circuit 133, so that the extension unit 100 can pass the first uplink signal The processing circuit 133 receives the uplink millimeter wave signal.

In this embodiment, the first electro-optic conversion module 230 is provided with a plurality of first electro-optic converters 231, and each first electro-optic converter 231 corresponds to the downlink millimeter wave signal output by a different transmission channel, and each first electro-optic converter 231 The output downlink optical signals have different wavelengths. When performing downlink communication, the photoelectric conversion unit 200 can modulate the downlink millimeter wave signals output by multiple transmission channels into downlink optical signals with different wavelengths, and transmit them through the first wavelength division multiplexer 210 and the second wavelength division multiplexer 310 output a plurality of downlink optical signals with different wavelengths to the corresponding second photoelectric converter 321, and realize photoelectric conversion through the second photoelectric converter 321, and then perform downlink communication. In this way, multiple base stations can be realized, so that the base station can further take into account the requirements of multi-channel, large bandwidth, long-distance transmission and low cost required for 5G millimeter wave communication.

In one embodiment, as shown in FIG. 3 , there are multiple first uplink signal processing circuits 133 , and there are also multiple antennas 500 . The first photoelectric conversion module 220 includes a plurality of first photoelectric converters 221 , and the second photoelectric conversion module 330 includes a plurality of second photoelectric converters 331 . The first wavelength division multiplexer 210 is respectively connected to each first photoelectric converter 221 , and each first photoelectric converter 221 is connected to each first uplink signal processing circuit 133 in a one-to-one correspondence. The second wavelength division multiplexer 310 is respectively connected to each second electro-optic converter 331 , and each second electro-optic converter 331 is connected to each antenna 500 in a one-to-one correspondence. Each antenna 500 is connected to each second photoelectric converter 321 in a one-to-one correspondence.

Specifically, in the present application, by setting multiple first uplink signal processing circuits 133 and multiple antennas 500, a base station with multiple receiving channels can be realized. Any two receiving channels can correspond to uplink millimeter-wave signals in the same or different frequency bands. The uplink millimeter-wave signals of different receiving channels can be converted into electro-optic by different second electro-optic converters 331 . Different second electro-optical converters 331 of the same remote unit 300 output uplink optical signals of different wavelengths. That is, after electro-optic conversion is performed on the uplink millimeter wave signals of different receiving channels, the uplink optical signals corresponding to the uplink millimeter wave signals of each receiving channel have different wavelengths. Uplink optical signals with different wavelengths can be converted photoelectrically by different first photoelectric converters 221, so as to obtain uplink millimeter wave signals of corresponding frequency bands from the uplink optical signals.

When performing uplink communication, each antenna 500 can output the uplink millimeter wave signal it receives to the corresponding second electro-optical converter 331, so that the uplink millimeter wave signal can be converted into a corresponding Uplink optical signal of the wavelength. Specifically, each second electrical-to-optical converter 331 can directly modulate the received uplink millimeter-wave signal onto an uplink optical carrier in the case of receiving the uplink millimeter-wave signal, so as to obtain an uplink optical signal of a corresponding wavelength.

The second wavelength division multiplexer 310 can combine the uplink optical signals output by the second electro-optic converters 331 , and output the combined uplink optical signals to the first wavelength division multiplexer 210 through the optical fiber 400 . The first wavelength division multiplexer 210 can split the beam-combined uplink optical signal to obtain a plurality of uplink optical signals with different wavelengths from the beam-combined uplink optical signal, and according to the wavelength of each uplink optical signal , respectively output each uplink optical signal to the corresponding first photoelectric converter 221, and each first photoelectric converter 221 is used to perform photoelectric conversion on the uplink optical signal when receiving the uplink optical signal, so as to obtain uplink millimeter wave signal, and output the uplink millimeter wave signal to the corresponding first uplink signal processing circuit 133, so as to complete the uplink communication through the extension unit 100.

In one of the embodiments, the wavelength of any uplink optical signal is different from that of any downlink optical signal, so that the optical fiber 400 can simultaneously transmit the uplink optical signal and the downlink optical signal, improving communication efficiency.

In one example, when the first photoelectric converter 221 is a millimeter-wave detector ROSA (Receiver Optical Subassembly, light receiving sub-module), the first electro-optical converter 231 is a millimeter-wave laser TOSA (Transmitter Optical Subassembly, light emitting sub-module) , if the number of ROSA and TOSA are two, the photoelectric conversion unit 200 can be as shown in FIG. 4 . Wherein, the wavelength of the downlink optical signal output by any TOSA is λ1, and the wavelength of the downlink optical signal output by the other TOSA is λ3. The wavelength of the uplink optical signal received by any ROSA is λ2, and the wavelength of the uplink optical signal received by the other ROSA is λ4. Further, λ1 may be 1550 nm, λ2 may be 1310 nm, λ3 may be 1625 nm, and λ4 may be 1490 nm.

In this embodiment, the second electro-optic conversion module 330 is provided with a plurality of second electro-optic converters 331, and each second electro-optic converter 331 corresponds to the uplink millimeter wave signal of a different receiving channel, and each second electro-optic converter 331 outputs The uplink optical signals have different wavelengths. When performing uplink communication, the remote unit 300 can modulate the uplink millimeter-wave signals of multiple receiving channels into uplink optical signals with different wavelengths, and pass through the second wavelength division multiplexer 310 and the first wavelength division multiplexer 210, Multiple uplink optical signals with different wavelengths are output to corresponding first photoelectric converters 221 , and photoelectric conversion is implemented by the first photoelectric converters 221 to obtain multiple uplink millimeter wave signals. Uplink communication is realized through multiple uplink millimeter wave signals. In this way, multiple base stations can be received, so that the base station can further take into account the requirements of multi-channel, large bandwidth, long-distance transmission and low cost required for 5G millimeter wave communication.

In one embodiment, as shown in FIG. 5 , the remote unit 300 further includes a second signal processing module 340, the second signal processing module 340 is connected between each antenna 500 and the corresponding second photoelectric converter 321, That is, each second photoelectric converter 321 is connected to the corresponding antenna 500 through the second signal processing module 340 . The second signal processing module 340 is also connected between each antenna 500 and the corresponding second electro-optic converter 331 , that is, each second electro-optic converter 331 is connected to the corresponding antenna 500 through the second signal processing module 340 .

The second signal processing module 340 is configured to selectively turn on any transmit path of each antenna 500 and any receive path of the antenna 500 . Wherein, the transmitting path refers to the path between the second photoelectric converter 321 and the antenna 500 , and the receiving path refers to the path between the antenna 500 and the second electro-optical converter 331 .

When the transmitting path corresponding to the second photoelectric converter 321 is turned on, the corresponding antenna 500 can receive and radiate the downlink millimeter wave signal output by the second photoelectric converter 321 . When the receiving channel corresponding to a second electro-optic converter 331 is turned on, the second electro-optic converter 331 can receive the uplink millimeter wave signal output by the corresponding antenna 500, and realize uplink communication according to the aforementioned process.

Specifically, the second signal processing module 340 can selectively turn on any transmitting path and any receiving path, so as to realize multi-channel transceiving. During downlink communication, the second signal processing module 340 is also used to filter and amplify downlink millimeter wave signals. For any downlink millimeter-wave signal, if the transmission path corresponding to the downlink millimeter-wave signal (that is, the transmission path between the second photoelectric converter 321 that outputs the downlink millimeter-wave signal and the antenna 500) is turned on, the second signal processing The module 340 may output the processed downlink millimeter wave signal to the corresponding antenna 500 to complete radiation through the antenna 500 . During uplink communication, for any uplink millimeter-wave signal, if the receiving path corresponding to the uplink millimeter-wave signal (that is, the path between the second electro-optical converter 331 and the antenna 500 corresponding to the uplink millimeter-wave signal) is turned on, Then the second signal processing module 340 may filter and amplify the uplink millimeter wave signal output by the antenna 500 , and output the processed uplink millimeter wave signal to the corresponding second electro-optical converter 331 .

In this embodiment, the remote unit 300 can selectively conduct the transmission path of the antenna 500 and the reception path of the antenna 500 through the second signal processing module 340, so as to realize time division duplex communication.

In one embodiment, as shown in FIG. 6, the second signal processing module 340 includes a plurality of second signal processing circuits 341, and the plurality of second signal processing circuits 341 are connected to the plurality of second photoelectric converters 321 in one-to-one correspondence, And the plurality of second signal processing circuits 341 are connected to the plurality of second electro-optical converters 331 in one-to-one correspondence. In other words, each second electro-optic converter 331 is connected to the antenna 500 through a second signal processing circuit 341 , and different second electro-optic converters 331 are connected to different second signal processing circuits 341 . Each second photoelectric converter 321 is connected to the antenna 500 through a second signal processing circuit 341 , and different second photoelectric converters 321 are connected to different second signal processing circuits 341 .

Each second signal processing circuit 341 includes a port filter F1, an uplink and downlink switching switch S1, a second downlink signal processing circuit and a second uplink signal processing circuit. Wherein, the port filter F1 is respectively connected to the corresponding antenna 500 and the uplink and downlink switch S1, and the uplink and downlink switch S1 is respectively connected to the second downlink signal processing circuit and the second uplink signal processing circuit. The second uplink signal processing circuit is connected to the corresponding second electro-optical converter 331 , and the second downlink signal processing circuit is connected to the corresponding second photoelectric converter 321 .

Wherein, the uplink and downlink switching switch S1 is used to complete the switching between the transmitted signal and the received signal, and the port filter F1 is used to filter out spurious filtering at the input port of the antenna 500 . The second uplink signal processing circuit is used for filtering and amplifying the uplink millimeter wave signal, and the second downlink signal processing circuit is used for filtering and amplifying the downlink millimeter wave signal.

For each second signal processing circuit 341, when performing downlink communication, the second downlink signal processing circuit receives the downlink millimeter wave signal output by the corresponding second photoelectric converter 321, and filters and amplifies the downlink millimeter wave signal to obtain The processed downlink millimeter wave signal. When the uplink and downlink switching switch S1 conducts the transmission path between the second downlink signal processing circuit and the port filter F1, the second downlink signal processing circuit can output to the antenna 500 through the uplink and downlink switching switch S1 and the port filter F1 in sequence. The processed downlink millimeter wave signal is used to make the antenna 500 radiate the processed downlink millimeter wave signal to realize downlink communication.

For each second signal processing circuit 341, when performing uplink communication, when the uplink and downlink switching switch S1 turns on the receiving path between the antenna 500 and the second uplink signal processing circuit, the antenna 500 can pass through the port filter F1 and the second uplink signal processing circuit in sequence. The uplink and downlink switching switch S1 outputs the uplink millimeter wave signal to the second uplink signal processing circuit. The second uplink signal processing circuit is configured to filter and amplify the uplink millimeter wave signal, and output the processed uplink millimeter wave signal to the corresponding second electro-optical converter 331 .

In this embodiment, by setting a port filter F1 in each second signal processing circuit 341, the spurious filtering at the input port of the antenna 500 can be filtered out by the port filter F1, thereby improving the communication quality.

In one embodiment, the remote unit 300 may be as shown in FIG. 7 . The second electro-optical converter 331 is a millimeter wave laser TOSA, and the second photoelectric converter 321 is a millimeter wave detector ROSA. The number of the millimeter wave laser TOSA, the millimeter wave detector ROSA and the second signal processing circuit 341 is two. Each second downlink signal processing circuit includes an adjustable gain amplifier PA1, a millimeter wave filter F2 and a power amplifier PA2 connected in sequence. In an example, the power amplifier PA2 may be a millimeter wave power amplifier. Each second uplink signal processing circuit includes a low noise amplifier LNA1, a millimeter wave filter F3 and an adjustable gain amplifier PA3 connected in sequence.

The millimeter wave detector ROSA is used to convert the downlink optical signal into a downlink millimeter wave signal. The adjustable gain amplifier PA1 is used to complete the gain adjustment and control of the transmission path. The millimeter wave filter F2 is used to complete the filtering of the transmission path. The power amplifier PA2 is used to complete the power amplification of the downlink millimeter wave signal. The uplink and downlink switching switch S1 is used to switch between transmitting signals and receiving signals. The port filter F1 is used to filter out spurious filtering at the input port of the antenna 500 .

The millimeter-wave laser TOSA is used to convert the uplink millimeter-wave signal into an uplink optical signal. The low noise amplifier LNA1 is used for performing low noise amplification on the uplink millimeter wave signal output by the antenna 500 . The millimeter wave filter F3 is used to filter the uplink millimeter wave signal. The adjustable gain amplifier PA3 is used to adjust and control the gain of the receiving path.

In one embodiment, as shown in FIG. 8 , the extension unit 100 further includes a baseband processing module 110 and an analog-to-digital/digital-to-analog conversion module 120 connected in sequence. The analog-to-digital/digital-to-analog conversion module 120 is respectively connected to each first downlink signal processing circuit 131 and each first uplink signal processing circuit 133 . During downlink communication, the baseband processing module 110 is configured to perform baseband processing on the downlink baseband signal to obtain a downlink digital signal, and output the downlink digital signal to the analog-to-digital/digital-to-analog conversion module 120 . The analog-to-digital/digital-to-analog conversion module 120 is used to convert the downlink digital signal into a downlink analog signal. The downlink analog signal is a radio frequency signal in the sub-6G frequency band. Each first downlink signal processing circuit 131 is configured to up-convert the downlink analog signal to obtain a downlink millimeter wave signal when receiving the downlink analog signal, and output the downlink millimeter wave signal to the photoelectric conversion unit 200 .

When performing uplink communication, each first uplink signal processing circuit 133 is also used to down-convert the uplink millimeter-wave signal to obtain an uplink analog signal when receiving the uplink millimeter-wave signal, and send the signal to the analog-to-digital/digital The analog conversion module 120 outputs an uplink analog signal. Wherein, the uplink analog signal is a radio frequency signal in a sub-6G frequency band. The analog-to-digital/digital-to-analog conversion module 120 is configured to convert the uplink analog signal into an uplink digital signal, and output the uplink digital signal to the baseband processing module 110 . The baseband processing module 110 is used for processing uplink digital signals to obtain uplink baseband signals.

In this embodiment, the extension unit 100 is realized by the baseband processing module 110, the analog-to-digital/digital-to-analog conversion module 120 and the first signal processing module 130, so that the base station can further take into account the requirements of large bandwidth, long-distance transmission and low cost, It is beneficial to the large-scale networking application of millimeter wave base stations.

In one embodiment, there are multiple remote units 300 and multiple photoelectric conversion units 200 . The multiple remote units 300 are connected to the multiple photoelectric conversion units 200 in a one-to-one correspondence. That is, each remote unit 300 is connected to a photoelectric conversion unit 200 , and different remote units 300 are connected to different photoelectric conversion units 200 . In this way, more areas can be covered by multiple remote units 300, further improving the signal coverage capability.

In one embodiment, as shown in FIG. 9, the first signal processing module 130 further includes a power divider 135 and a combiner 137, wherein the number of the power divider 135 is the same as the number of the first downlink signal processing circuit 131, The number of combiners 137 is the same as the number of first uplink signal processing circuits 133 .

Each power divider 135 is connected to each first downlink signal processing circuit 131 in a one-to-one correspondence, and each power divider 135 is respectively connected to each of the photoelectric conversion units 200 . Each combiner 137 is connected to each first uplink signal processing circuit 133 in a one-to-one correspondence, and each combiner 137 is respectively connected to each photoelectric conversion unit 200 .

During downlink communication, the first downlink signal processing circuit 131 can receive the downlink analog signal output by the analog-to-digital/digital-to-analog conversion module 120, and up-convert the downlink analog signal to convert the frequency of the downlink analog signal in the sub-6G frequency band It is the downlink millimeter wave signal. Each power divider 135 is used to receive the downlink millimeter-wave signal output by the corresponding first downlink signal processing circuit 131, and divide the downlink millimeter-wave signal, and divide the divided downlink millimeter-wave signals one by one Correspondingly output to each photoelectric conversion unit 200 . Each power divider 135 can divide one downlink millimeter wave signal into several branches and output them to different photoelectric conversion units 200 .

During uplink communication, each combiner 137 can receive the uplink millimeter-wave signals output by each optical path conversion unit, and combine multiple uplink millimeter-wave signals to obtain the combined uplink millimeter-wave signals, and send to the corresponding The first uplink signal processing circuit 133 outputs an uplink millimeter wave signal. The first uplink signal processing circuit 133 can down-convert the frequency of the combined uplink millimeter wave signal, so as to convert the frequency of the uplink millimeter wave signal into an uplink analog signal in the sub-6G frequency band.

In one of the embodiments, as shown in FIG. 10, the first downlink signal processing circuit 131 may include a low-frequency filter F4, an adjustable gain amplifier PA4, an up-converter M1, a millimeter-wave filter F5, a millimeter-wave Amplifier PA5 and millimeter wave filter F6. The low-frequency filter F4 is connected to the analog-to-digital/digital-to-analog conversion module 120 , and the millimeter-wave filter F6 is connected to the power divider 135 . In one example, the low-frequency filter F4 may be a sub-6G filter, and the millimeter-wave amplifier PA5 may be a low-power millimeter-wave amplifier.

During downlink communication, the downlink analog signal output by the AD/DA conversion module 120 is filtered and amplified sequentially by the low frequency filter F4 and the adjustable gain amplifier PA4, and the processed downlink analog signal is output. If the signal frequency of the downlink analog signal is f1, the up-converter M1 can use a local oscillator signal with a frequency of (26.125-f1) GHz to convert the processed downlink analog signal into a downlink millimeter-wave signal in the millimeter-wave frequency band. The frequency of the downlink millimeter wave signal may be 24.75GHz to 27.5GHz. The downlink millimeter wave signal output by the up-converter M1 is sequentially filtered, amplified, and filtered through the millimeter wave filter F5, the millimeter wave amplifier PA5, and the millimeter wave filter F6, and the processed downlink millimeter wave signal is passed through the power splitter 135 The signal is divided into multiple channels, and each channel is output to the corresponding photoelectric conversion unit 200 .

The first uplink signal processing circuit 133 may include a millimeter wave amplifier PA6, a millimeter wave filter F7, a down converter M2, an adjustable gain amplifier PA7, a low frequency filter F8 and a low frequency amplifier PA8 connected in sequence. The millimeter-wave amplifier PA6 is connected to the combiner 137 , and the low-frequency amplifier PA8 is connected to the analog-to-digital/digital-to-analog conversion module 120 . In an example, the adjustable gain amplifier PA7, the low frequency filter F8 and the low frequency amplifier PA8 can all be devices for processing sub-6G frequency band signals.

During uplink communication, the uplink millimeter-wave signal output by the combiner 137 is sequentially amplified and filtered by the millimeter-wave amplifier PA6 and the millimeter-wave filter F7. Wherein, the frequency of the uplink millimeter wave signal may be 24.75GHz to 27.5GHz. The down-converter M2 is used to down-convert the filtered and amplified uplink millimeter-wave signal into an uplink analog signal using a local oscillator signal with a frequency of (26.125-f2). The uplink analog signal is a sub-6G frequency band signal, and the frequency is f2. The uplink analog signal output by the down-converter M2 is sequentially amplified, filtered and amplified by the adjustable gain amplifier PA7, the low-frequency filter F8 and the low-frequency amplifier PA8, and outputs the processed uplink millimeter wave to the analog-to-digital/digital-to-analog conversion module 120 Signal.

In this embodiment, a power divider 135 and a combiner 137 are set in the first signal processing module 130, so that the downlink millimeter-wave signal can be divided by the power divider 135, and the multi-channel uplink millimeter wave signal can be divided by the combiner 137. Wave signals are combined, and more remote units 300 can be installed in the base station to further improve the signal coverage capability.

In order to facilitate understanding of the solution of the present application, a specific example is used below for description. As shown in Figure 11, a 2-transmission and 2-reception base station is provided, which supports the 5G NR (New Radio, new air interface) standard. The operating frequency is from 24.75GHz to 27.5GHz, and the signal bandwidth is 800MHz. Each extension unit 100 can be connected to 8 remote units 300 at most.

The base station can be divided into several downlink transmission links and several uplink reception links from the perspective of signal chains. Wherein, each downlink transmission link may include the downlink transmission link of the extension unit 100, the downlink transmission link of the photoelectric conversion unit 200, the downlink transmission link of the remote unit 300 and the antenna 500, and the antenna 500 may be two intersecting Polarized array mmWave antenna to realize two-way antenna.

Wherein, the downlink transmission link of the expansion unit 100 includes a baseband processing module 110, a sub-6G radio frequency sampling DAC (Digital to Analog Converter, digital-to-analog converter) in the analog-to-digital/digital-to-analog conversion module 120, and a first downlink signal processing Circuit 131, the first downlink signal processing circuit 131 includes a low frequency filter F4, an adjustable gain amplifier PA4, an upconverter M1, a millimeter wave filter F5, a millimeter wave amplifier PA5, a millimeter wave filter F6 and a power divider 135 . The baseband processing module 110 is used to complete the related processing of the baseband signal and output the downlink digital signal. The sub-6G RF sampling DAC is used to convert the downlink digital signal into a downlink analog signal in the sub-6G frequency band. The first downlink signal processing circuit 131 is used for up-converting, filtering and amplifying the downlink analog signal output by the sub-6G radio frequency sampling DAC, and outputting the downlink millimeter wave signal to the power divider 135 . The power divider 135 divides the received downlink millimeter wave signal into 8 channels, and outputs each channel of the downlink millimeter wave signal to the eight photoelectric conversion units 200 .

The downlink transmission link of the photoelectric conversion unit 200 includes a millimeter wave laser TOSA and a first wavelength division multiplexer 210 . Among them, the photoelectric conversion unit 200 is provided with two millimeter-wave laser TOSAs, any millimeter-wave laser TOSA is used to convert the downlink millimeter-wave signal from the extension unit 100 into a downlink optical signal of 1 wavelength, and the other millimeter-wave laser TOSA is used for It is used to convert the downlink millimeter wave signal from the extension unit 100 into a downlink optical signal of 3 wavelengths. Wherein, 1 may be 1550nm, and 3 may be 1625nm, and downlink optical signals corresponding to different downlinks have different wavelengths. The first wavelength division multiplexer 210 is used to combine the downlink optical signal of 1 wavelength and the downlink optical signal of 3 wavelengths, and pull the combined optical signal to the corresponding remote unit 300 through the optical fiber 400 .

Each remote unit 300 may include 2 downlink transmission links, and the 2 downlink transmission links of the same remote unit 300 are multiplexed with the same second wavelength division multiplexer 310 to implement. Each downlink transmission link specifically includes a second wavelength division multiplexer 310, a millimeter wave detector ROSA, a second downlink signal processing circuit, an uplink and downlink switching switch S1, and a port filter F1. The second downlink signal processing circuit includes Adjustable gain amplifier PA1, millimeter wave filter F2 and power amplifier PA2.

The second wavelength division multiplexer 310 receives the combined downlink optical signals through the optical fiber 400, and separates the downlink optical signals with wavelengths 1 and 3 according to the different optical wavelengths, and outputs the downlink optical signals with different wavelengths to different Downlink mmWave detector ROSA. The millimeter wave detector ROSA is used to convert the downlink optical signal into a downlink millimeter wave signal, and the downlink millimeter wave signal is amplified, filtered and power amplified by the adjustable gain amplifier PA1, the millimeter wave filter F2 and the power amplifier PA2 in turn , and then output to the antenna 500 through the uplink and downlink switching switch S1 and the port filter F1 to complete the signal transmission coverage.

Each uplink transmit link may include the antenna 500 , the uplink receive link of the remote unit 300 , the uplink receive link of the photoelectric conversion unit 200 , and the uplink receive link of the extension unit 100 .

Each remote unit 300 may include two uplink receive links, and each uplink receive link of each remote unit 300 includes a port filter F1 (shared with the downlink transmit link), an uplink and downlink switch S1 (shared with the downlink transmit link) The downlink transmission link is shared), the second uplink signal processing circuit, the millimeter wave laser TOSA and the second wavelength division multiplexer 310 (shared with the downlink transmission link). Wherein, the second uplink signal processing circuit includes a low noise amplifier LNA1, a millimeter wave filter F3 and an adjustable gain amplifier PA3, and the number of millimeter wave laser TOSAs in the remote unit 300 is two.

After the uplink millimeter wave signal is input by the antenna 500, after being filtered by the port filter F1 and the uplink and downlink switching switch S1 for link switching, it enters the low noise amplifier LNA1, the millimeter wave filter F3 and the adjustable gain amplifier PA3 to complete the amplification and filter processing. The signals of different receiving links are converted into uplink optical signals with different wavelengths by different millimeter-wave laser TOSAs. Specifically, any millimeter-wave laser TOSA is used to convert the uplink millimeter-wave signal from the second uplink signal processing circuit into an uplink optical signal of wavelength λ2, and the other millimeter-wave laser TOSA is used to convert the uplink signal from the second uplink signal processing circuit The uplink millimeter wave signal is converted into an uplink optical signal of λ4 wavelength. Wherein, λ2 may be 1310 nm, and λ4 may be 1490 nm. The second wavelength division multiplexer 310 is used to combine the uplink optical signals with different wavelengths, and output the combined uplink optical signals to the photoelectric conversion unit 200 through the optical fiber 400 .

The photoelectric conversion unit 200 includes two uplink receiving links, and different uplink receiving links process different uplink optical signals. Each uplink receive link includes a first wavelength division multiplexer 210 (shared by the two uplink receive links and shared with the downlink transmit link) and a millimeter wave detector ROSA. The first wavelength division multiplexer 210 is used to receive the combined uplink optical signals through the optical fiber 400, and separate the uplink optical signals with wavelengths λ2 and λ4 according to different optical wavelengths, and output the uplink optical signals with different wavelengths respectively into different mmWave detectors ROSA. The millimeter wave detector ROSA is used to convert the uplink optical signal into an uplink millimeter wave signal, and output it to the extension unit 100 .

The uplink receiving link of the expansion unit 100 includes a combiner 137, a first uplink signal processing circuit 133, a sub-6G radio frequency sampling ADC (Analog to Digital Converter, analog-to-digital converter) in the analog-to-digital/digital-to-analog conversion module 120, and Baseband processing module 110. The first uplink signal processing circuit 133 includes a millimeter wave amplifier PA6, a millimeter wave filter F7, a down converter M2, an adjustable gain amplifier PA7, a low frequency filter F8 and a low frequency amplifier PA8.

Wherein, the combiner 137 combines multiple uplink millimeter wave signals from different photoelectric conversion units 200, and outputs the combined uplink millimeter wave signal. The combined uplink millimeter-wave signal is input into the first uplink signal processing circuit 133, and after amplification, filtering and down-conversion processing, an uplink analog signal in the sub-6G frequency band is obtained, and the uplink signal is output to the sub-6G radio frequency sampling ADC. analog signal. The frequency of the uplink analog signal is f2. The sub-6G radio frequency sampling ADC performs analog-to-digital conversion on the uplink analog signal, and outputs the converted uplink digital signal to the baseband processing module 110 for subsequent processing.

In an embodiment, the present application provides a communication system, where the communication system includes the base station in any of the foregoing embodiments. It can be understood that, in addition to the above-mentioned base stations, the communication system may also include other types of base stations, and more equipment besides the base stations, which is not specifically limited in the present application. Meanwhile, the specific number of the above-mentioned base stations may also be determined according to actual communication requirements, which is not specifically limited in this application.

Claims (10)

1. A base station, characterized in that the base station includes an extension unit, a photoelectric conversion unit, and a remote unit; the photoelectric conversion unit is connected to the extension unit, and is used to connect the remote unit through an optical fiber;

   The extension unit is used to convert the downlink baseband signal into a downlink millimeter wave signal; the photoelectric conversion unit is used to directly modulate the downlink millimeter wave signal onto a downlink optical carrier to convert the downlink millimeter wave signal into a downlink an optical signal; the remote unit is used to convert the downlink optical signal into the downlink millimeter wave signal;

   The remote unit is used to receive an uplink millimeter wave signal, and directly modulate the uplink millimeter wave signal onto an uplink optical carrier, so as to convert the uplink millimeter wave signal into an uplink optical signal; the photoelectric conversion unit is used for converting the uplink optical signal into the uplink millimeter wave signal; the extension unit is used to convert the uplink millimeter wave signal into an uplink baseband signal.
2. The base station according to claim 1, wherein the base station further includes an antenna, the extension unit includes a first signal processing module, and the first signal processing module includes a first uplink signal processing circuit and a plurality of first Downlink signal processing circuit; the photoelectric conversion unit includes a first wavelength division multiplexer, a first photoelectric conversion module, and a first electro-optical conversion module, and the first electro-optical conversion module includes a plurality of first electro-optic converters; the The remote unit includes a second wavelength division multiplexer, a second photoelectric conversion module, and a second electro-optical conversion module, and the second photoelectric conversion module includes a plurality of second photoelectric converters;

   The first uplink signal processing circuit is connected to the first photoelectric conversion module, each of the first downlink signal processing circuits is connected to each of the first electro-optical converters in a one-to-one correspondence; the first wavelength division multiplexer The first photoelectric conversion module and each of the first electro-optical converters are respectively connected, and are used to connect the second wavelength division multiplexer through the optical fiber; the second wavelength division multiplexer is respectively connected to the The second electro-optical conversion module and each of the second photoelectric converters; the second electro-optical conversion module and each of the second photoelectric converters are connected to the antenna;

   Wherein, the extension unit is configured to output the downlink millimeter-wave signal to the corresponding first electro-optic converter through each of the first downlink signal processing circuits; each of the first electro-optic converters is configured to receive the In the case of a downlink millimeter wave signal, the downlink millimeter wave signal is directly modulated onto the downlink optical carrier to obtain the downlink optical signal; wherein, the modulated signal is modulated by different first electro-optic converters of the same photoelectric conversion unit The obtained downlink optical signals have different wavelengths;

   The first wavelength division multiplexer is used to combine the downlink optical signals output by each of the first electro-optic converters, and obtain the combined downlink optical signals; the second wavelength division multiplexer is used to splitting the beam-combined downlink optical signals to obtain each of the downlink optical signals, and output each of the downlink optical signals to the corresponding second photoelectric conversion signal according to the wavelength of each of the downlink optical signals each of the second photoelectric converters is used to convert the downlink optical signal into the downlink millimeter wave signal when the downlink optical signal is received; the antenna is used to emit the downlink millimeter wave Signal;

   The antenna is used to receive the uplink millimeter wave signal, and output the uplink millimeter wave signal to the second electro-optic conversion module; the second electro-optic conversion module is used to directly modulate the uplink millimeter wave signal to on the uplink optical carrier to obtain the uplink optical signal, and sequentially pass through the second wavelength division multiplexer and the first wavelength division multiplexer, and output the uplink optical signal to the first A photoelectric conversion module; the first photoelectric conversion module is used to convert the uplink optical signal into the uplink millimeter wave signal and output it to the first uplink signal processing circuit; the extension unit is used to pass the first An uplink signal processing circuit receives the uplink millimeter wave signal.
3. The base station according to claim 2, wherein the number of the first uplink signal processing circuits is multiple, and the number of the antennas is multiple; the first photoelectric conversion module includes a plurality of first photoelectric conversion modules The second electro-optical conversion module includes a plurality of second electro-optical converters; the first wavelength division multiplexer is respectively connected to each of the first photoelectric converters, and each of the first photoelectric converters is connected to each of the first photoelectric converters. The first uplink signal processing circuits are respectively connected in one-to-one correspondence; the second wavelength division multiplexers are respectively connected to the second electro-optical converters, and each of the second electro-optical converters is connected to each of the antennas in a one-to-one correspondence. , and each of the antennas is connected to each of the second photoelectric converters in a one-to-one correspondence;

   Wherein, each of the antennas is also used to output the received uplink millimeter-wave signal to the corresponding second electro-optic converter; each of the second electro-optical converters is used for receiving the uplink millimeter-wave signal In some cases, the uplink millimeter wave signal is directly modulated onto the uplink optical carrier to obtain the uplink optical signal; wherein, the uplink optical signal modulated by different second electro-optical converters of the same remote unit with different wavelengths;

   The second wavelength division multiplexer is used to combine the uplink optical signals output by each of the second electro-optic converters, and obtain the combined uplink optical signal; the first wavelength division multiplexer is used to performing beam splitting on the combined uplink optical signals to obtain each of the uplink optical signals, and outputting each of the uplink optical signals to the corresponding first photoelectric converter according to the wavelength of each of the uplink optical signals device; each of the first photoelectric converters is used to convert the uplink optical signal into the uplink millimeter wave signal and output the uplink millimeter wave signal to the corresponding The first uplink signal processing circuit.
4. The base station according to claim 3, wherein the wavelength of any one of the uplink optical signals is different from the wavelength of any one of the downlink optical signals.
5. The base station according to claim 3, wherein the remote unit further includes a second signal processing module, and the second signal processing module is connected to each of the antennas and the corresponding second photoelectric converter Between, the second signal processing module is also connected between each of the antennas and the corresponding second electro-optic converter;

   The second signal processing module is used to selectively conduct the transmission path of each antenna and the reception path of the antenna;

   For each antenna, the second signal processing module is further configured to filter and amplify the downlink millimeter wave signal, and output the processed downlink millimeter wave signal when the transmission path is turned on to the antenna; and, when the receiving path is turned on, filter and amplify the uplink millimeter wave signal received by the antenna, and output the processed uplink millimeter wave signal to the corresponding Describe the second electro-optical converter.
6. The base station according to claim 5, wherein the second signal processing module includes a plurality of second signal processing circuits, and the plurality of second signal processing circuits and the plurality of second photoelectric converters are one by one Correspondingly connected, and a plurality of the second signal processing circuits and a plurality of the second electro-optical converters are connected in one-to-one correspondence;

   Wherein, each of the second signal processing circuits includes a port filter, an uplink and downlink switching switch, a second downlink signal processing circuit and a second uplink signal processing circuit;

   The port filters are respectively connected to the corresponding antennas and the uplink and downlink switches, and the uplink and downlink switches are respectively connected to the second downlink signal processing circuit and the second uplink signal processing circuit, and the second uplink signal processing circuit is connected to the second uplink signal processing circuit. The uplink signal processing circuit is connected to the corresponding second electro-optical converter, and the second downlink signal processing circuit is connected to the corresponding second photoelectric converter.
7. The base station according to any one of claims 3 to 6, wherein the extension unit further includes a baseband processing module and an analog-to-digital/digital-to-analog conversion module connected in sequence; the analog-to-digital/digital-to-analog conversion modules are respectively connected to Each of the first downlink signal processing circuits and each of the first uplink signal processing circuits;

   The baseband processing module is used to perform baseband processing on the downlink baseband signal to obtain a downlink digital signal; the analog-to-digital/digital-to-analog conversion module is used to convert the downlink digital signal into a downlink analog signal, and convert the The downlink analog signal is output to the corresponding first downlink signal processing circuit; each of the first downlink signal processing circuits is configured to up-convert the downlink analog signal when receiving the downlink analog signal, to obtain the downlink millimeter wave signal; wherein the downlink analog signal is a radio frequency signal in the sub-6G frequency band;

   Each of the first uplink signal processing circuits is further configured to down-convert the uplink millimeter-wave signal to obtain an uplink analog signal when receiving the uplink millimeter-wave signal; the analog-to-digital/digital-to-analog The conversion module is used to convert the uplink analog signal into an uplink digital signal; the baseband processing module is used to process the uplink digital signal to obtain the uplink baseband signal; wherein the uplink analog signal is a sub-6G frequency band radio frequency signal.
8. The base station according to claim 7, characterized in that, there are multiple remote units, multiple photoelectric conversion units, multiple photoelectric conversion units and multiple remote units One-to-one connection.
9. The base station according to claim 8, wherein the first signal processing module further includes power dividers and combiners, the number of power dividers is the same as the number of the first downlink signal processing circuits, The number of combiners is the same as the number of the first uplink signal processing circuits;

   Each of the power dividers is connected to each of the first downlink signal processing circuits in one-to-one correspondence, and each of the power dividers is respectively connected to each of the photoelectric conversion units; each of the combiners is connected to each of the first downlink signal processing circuits. An uplink signal processing circuit is connected in one-to-one correspondence, and each of the combiners is respectively connected to each of the photoelectric conversion units;

   Each of the power splitters is used to receive the downlink millimeter-wave signal output by the corresponding first downlink signal processing circuit, and split the downlink millimeter-wave signal, and divide each downlink signal after splitting. The millimeter wave signals are output to each of the photoelectric conversion units in one-to-one correspondence;

   Each combiner is used to receive the uplink millimeter-wave signals output by the photoelectric conversion units, and combine the uplink millimeter-wave signals to obtain the combined uplink millimeter-wave signals, and send to The corresponding first uplink signal processing circuit outputs the uplink millimeter wave signal.
10. A communication system, characterized by comprising an optical fiber, and the base station according to any one of claims 1 to 9.

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