CN106304420B - Wireless forward transmission system for 5G power multiplexing-oriented analog optical transmission - Google Patents

Abstract

The present invention provides a wireless fronthaul system for analog optical transmission for 5G power multiplexing, including: a BBU pool, a feeder fiber, a remote node, a distributed fiber, a user terminal UE, and an RRU unit; the BBU pool passes through the optical line terminal It is connected to the remote node through the feeder fiber, the output end of the remote node is connected to the input end of the distributed fiber, the output end of the distributed fiber is connected to the RRU unit, and the output end of the RRU unit is sent to the user terminal UE through the air interface through the antenna. The invention realizes multiplexing of the analog signal modulated based on the subcarrier in the signal power dimension, improves the spectral efficiency in the future mobile communication system, and increases the transmission capacity. In addition, the present invention also distinguishes different user data by superimposing the size of the signal power, and selects the power size according to the distance between the user and the base station processing unit to realize power multiplexing, so as to solve the problem caused by the near and far effect of the wireless terminal accessing the user. System performance imbalance.

Description

Wireless fronthaul system for analog optical transmission for 5G power multiplexing

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a wireless fronthaul system for analog optical transmission for 5G power multiplexing.

Background technique

With the rapid development of communication technology and the continuous evolution of technical standards, the emergence of the fourth generation mobile communication technology (4G) has enabled its data service transmission rate to reach 100 megabits or even gigabits per second, which can meet certain requirements to a certain extent. demand for broadband mobile communication applications. However, with the continuous growth of the popularization and application of intelligent terminals and the demand for new mobile services, the demand for wireless transmission rate increases exponentially, and the transmission rate of wireless communication will still be difficult to meet the application requirements of future mobile communication. In addition, according to the "5G Vision and Demand White Paper" proposed by the 5G Promotion Group (IMT-2020), the future 5G wireless network needs to be able to meet higher spectral efficiency, faster access rate, and larger access capacity. Among them, the spectral efficiency is 5 to 15 times higher than that of 4G. At the same time, with the continuous increase of speed and capacity, Radio Access Network (RAN, Radio access network), as an important asset for mobile operators to survive, is facing unprecedented challenges: 1) Improve RAN access by enhancing air interface capabilities 2) High RAN capital expenditure (CAPEX, Capital Expenditure) and operating cost (OPEX, Operating Expense); 3) The tidal effect of user services leads to low base station utilization ; 4) The increase of user's access traffic and operator's income is seriously disproportionate. The 5G mobile communication under development is to meet the demand for the growth of mobile service traffic through higher spectrum efficiency, more spectrum resources, and denser cell deployment. Therefore, based on the above-mentioned challenges, the future mobile communication system needs to introduce a new type of radio access network architecture to enhance the competitiveness of the network.

The radio access network C-RAN, which integrates the characteristics of 4C (Clean, Centralized, Cooperative and Cloud), is based on distributed base stations, and realizes network resources through centralized baseband processing, cooperative radio technology and cloud computing-based infrastructure. Shared and dynamic load balancing. This technology can provide larger and more flexible bandwidth access and support more operating standards. It is not only the mainstream access solution in the current LTE era, but also conforms to the development trend of 5G mobile communication access network architecture. The C-RAN consists of a baseband processing unit (Baseband Processing Unit, BBU), a radio remote unit (Radioremote unit, RRU), and a transmission fiber link between the BBU and the RRU. The downward direction of the RRU is an air interface, the upward direction of the BBU is a network side interface, and the signal transmitted between the BBU and the RRU is a digital baseband signal based on a Common Public Radio Interface (CPRI). In the C-RAN system, the data transmission between the RRU and the BBU is called wireless fronthaul (fronthaul), and the data accessed by traditional macro base stations or small cells is backhaul (backhaul). Under the C-RAN framework, wireless access mainly refers to fronthaul (wireless fronthaul). At present, the wireless fronthaul bearing methods for C-RAN mainly include optical fiber direct drive, optical transport network (OTN) and passive optical access network (PON) systems. Among them, the optical fiber direct drive solution needs to occupy more optical fiber resources, and the construction and maintenance costs and difficulties are high; although the optical fiber resources can be saved based on the OTN solution, the system equipment is expensive and difficult to meet the frequency jitter requirements of the fronthaul data; The PON-based solution can reuse the fiber network of the existing PON system, save fiber resources and reduce the cost of wireless access network upgrades.

Therefore, for the 5G access network, how to use the optical fiber access network system to efficiently realize the access data transmission through the optical fiber transmission technology, that is, to achieve high-speed, large-capacity, and high spectral efficiency through the existing optical fiber access network system. The transmission of wireless fronthaul data is one of the hotspots and difficulties in current research. Existing literature search found that the current wireless fronthaul system based on optical fiber access network is mainly developed from two aspects, digital and analog, and various technologies are used to improve the capacity and transmission rate of the system. For example, Xiang Liu, Huaiyu Zeng and others published the paper "Bandwidth-Efficient Mobile Fronthaul Transmission for Future 5G Wireless Networks" at the 2015 Asia Communications and Photonics Conference (ACP), proposing the use of analog subcarrier modulation technology, through The signal is modulated on different subcarriers to obtain the aggregation of the transmission data, thereby realizing the increase of the wireless access rate. However, the essence of the scheme based on the subcarrier modulation technology is frequency reuse, and it is necessary to increase the capacity of the access system by expanding the frequency resources. In addition, with the increase in the number of aggregated carriers in the system, that is, the bandwidth required to transmit analog signals increases, which will increase the linearity of the optoelectronic devices in the optical access network system to a certain extent, thereby increasing the cost due to system expansion. Increase.

SUMMARY OF THE INVENTION

In view of the defects in the prior art, the purpose of the present invention is to provide a wireless fronthaul system for analog optical transmission for 5G power multiplexing.

The wireless fronthaul system for analog optical transmission for 5G power multiplexing provided according to the present invention includes: a BBU pool, a feeder fiber, a remote node, a distributed fiber, a number of user terminals UE, and a number of remote radio frequency units, namely Several RRU units; where:

The BBU pool is connected to the remote node through the optical line terminal through the feeder fiber, the output end of the remote node is connected to the input end of the distributed fiber, the output end of the distributed fiber is connected to the RRU unit, and the output end of the RRU unit is connected. It is sent to the user terminal UE through the antenna through the air interface.

Preferably, the BBU pool includes: M BBU units and a first wavelength division multiplexer, and the output ends of the M BBU units are connected to the input end of the feeder fiber through the first wavelength division multiplexer; wherein the value of M is Mainly depends on the number of wired and wireless user data accessed by the system, the value of M is a natural number greater than 1, including 4, 8, 16, 32, 64, 128, 256, 512 or 1024;

The BBU unit, that is, the baseband processing unit, includes: an electrical domain power multiplexing module, an electrical amplifier and an optical modulator module; the output end of the electrical domain power multiplexing module is connected to the input end of the electrical amplifier for realizing user signal amplification; the output of the electrical amplifier is connected to the input end of the optical modulator module for driving the optical modulator module; the output end of the optical modulator module is connected to the first wavelength division multiplexer for realizing the optical signal modulation.

Preferably, the remote node is an optical splitter/combiner, which is used to realize the distribution of downlink user data.

Preferably, the RRU unit includes: an optical filter, a photoelectric conversion module, a power amplifier and an antenna; the signal sent by the distributed optical fiber is sequentially transmitted through the optical filter, the photoelectric conversion module, and the power amplifier to the user terminal UE through the antenna; wherein :

The optical filter is used for filtering the signal sent by the distributed optical fiber;

The photoelectric conversion module is used to convert the filtered optical signal into a corresponding electrical signal;

The power amplifier is used to amplify the electrical signal and transmit it to the antenna.

Preferably, the user terminal UE is used to demodulate the received power multiplexed signal; specifically, according to the difference between the BBU pool and the user terminal UE, different transmit powers are used to transmit the signal;

For the user terminal UE whose distance is greater than or equal to the set threshold, the signal received by the antenna is first subjected to down-conversion and then subjected to signal estimation and equalization processing, and the signal that has undergone signal estimation and equalization processing is demodulated by the signal demodulation module and sent to the user;

For a user terminal UE whose distance is less than the set threshold, the signal received by the antenna is first subjected to down-conversion, and a part of the down-converted signal is subjected to signal estimation and equalization processing, and the signal after signal estimation and equalization processing is demodulated by the signal demodulation module. It is sent to the acquisition unit of the high-power allocated user in the power multiplexed signal, thereby obtaining high-power user data; after the high-power user data is multiplied by the frequency domain data of the channel response, it is combined with another part of the down-converted signal. Connected to the subtractor module to obtain the baseband modulated signal of the low-power user, the baseband modulated signal is subjected to signal estimation and equalization processing, and the signal after signal estimation and equalization processing is transmitted to the demodulation module for demodulation and sent to the user.

Preferably, the electrical domain power multiplexing module includes: N user signal generation modules, multipliers, power distribution units and adders, where N is a natural number greater than or equal to 1; the output end of the user signal generation module, The output ends of the power distribution unit are all connected to the input end of the multiplier, the output end of the multiplier is connected to the input end of the adder, and the output end of the adder constitutes the output end of the electrical domain power multiplexing module for outputting electrical power. Domain power multiplexing signal; wherein the user signal generation module is used to generate the downlink user data of the baseband, and the power distribution unit is used to realize the power adjustment of the downlink user data.

Preferably, it also includes a user data generation module, the user data generation module is used to generate a downlink user data signal; the downlink user data signal is a waveform signal conforming to the future mobile communication air interface, including: an orthogonal frequency division multiplexing signal, Any of a filtered OFDM signal, a non-uniform filterbank-based OFDM signal, a filterbank-based OFDM signal.

Preferably, the optical modulator module includes: any form of a DFB laser, a MYG laser, a VCSEL laser, a DBR laser, or a laser plus an external modulator, or a laser plus a modulator; the external modulator includes: Mach Zender modulators, electroabsorption modulators.

Preferably, the first wavelength division multiplexer is a wavelength division multiplexing device with combining and branching functions, including: an arrayed waveguide grating.

Preferably, the photoelectric conversion module includes any one of a photodiode PIN and an avalanche diode APD.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts the power multiplexing technology. In the multiplexing dimension of the power boosting system, on the one hand, the same wavelength can be used to carry multiple times of data information; The problem of analog subband interference caused by carrier multiplexing.

2. The present invention utilizes optoelectronic devices with low modulation bandwidth to achieve a high-speed transmission rate, which can reduce the cost of future system capacity upgrades to a certain extent.

3. The present invention makes full use of the multiplexing technology in the power domain, which can improve the spectral efficiency of the system and increase the transmission capacity of the fronthaul system.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

1 is a detailed schematic diagram of an analog optical transmission system based on power multiplexing in a 5G wireless fronthaul network according to the present invention;

Fig. 2 is the contrast diagram of the constellation diagram of high and low power users; Fig. 2 (a) is the constellation diagram of low power user, Fig. 2 (b) is the constellation diagram of high power user;

Figure 3 shows the up-converted signal after power multiplexing.

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

The wireless fronthaul system for analog optical transmission for 5G power multiplexing provided according to the present invention includes: a BBU (baseband processing unit) pool, a feeder fiber, a remote node, a number of distributed fibers, and a number of remote radio units (referred to as RRUs). ) unit and several user terminals (UEs), wherein the BBU pool is connected to the remote node through the optical line terminal through the feeder fiber, the output of the remote node is connected to the distributed fiber, the distributed fiber output is connected to the RRU unit, and the RRU The output of the unit is sent to the UE through the antenna through the air interface, so as to realize the distribution of downlink data;

The described BBU pool is characterized in that it is composed of M BBU units and a first wavelength division multiplexer, wherein the data of the M BBU units is output and connected to the first wavelength division multiplexer, and the first wavelength division multiplexer is connected to the first wavelength division multiplexer. Connect to feeder fiber with modules;

The BBU unit is characterized in that it is composed of an electrical domain power multiplexing module, an electrical amplifier and an optical modulator module; wherein, the output of the electrical domain power multiplexing module is connected to the electrical amplifier to realize the amplification of user signals, and the The output is connected to the optical modulator module for driving the optical modulator module; the output of the optical modulator module is connected to the first wavelength division multiplexer;

The described remote node is characterized in that it can realize the distribution of downlink user data; it is composed of an optical branch/combiner (splitter);

The RRU unit is characterized in that it mainly receives downlink user data; it mainly includes an optical filter, a photoelectric conversion module, a power amplifier, and an antenna; the data signal from the distributed optical fiber to the user unit is first output by the distributed optical fiber Connected to the optical filter, the output of the optical filter is connected to the photoelectric conversion module, the output of the photoelectric conversion module is connected to the power amplifier, and the output of the power amplifier is connected to the antenna, so as to realize the distribution of downlink data;

The described user terminal UE is characterized in that it mainly completes the demodulation of the power multiplexed signal; according to the principle of generating the power multiplexed signal, different transmit powers are used for UE users located at different distances from the BBU pool (for distance comparison users). High transmit power is used, and low transmit power is used for users with relatively close distances), so for users with different powers, the receiving modules on the UE side are different. 1) For users with a long distance, the signal received by the antenna first enters the signal estimation and equalization after down-conversion, the output of the signal estimation and equalization is connected to the signal demodulation module, and the output of the signal demodulation reaches the acquisition of user data, 2) For users with a short distance, the signal received by the antenna is connected to the down-conversion, and a part of the down-converted signal is connected to the channel estimation and equalization of the user terminal, and the output of the signal estimation and equalization signal It is connected to the signal demodulation, and the output of the signal demodulation is connected to the acquisition unit of the high-power distribution user in the power multiplexed signal, so as to obtain high-power user data; the high-power user data is multiplied by the channel response in the frequency domain. After that, it is connected to the subtractor module together with another part of the down-conversion output to obtain the baseband modulated signal of the low-power user, which is then connected to the signal estimation and equalization, and the output of the signal estimation and equalization is connected to the signal demodulation module, The output of signal demodulation reaches the acquisition of user data, thereby realizing the reception of user data;

The electrical domain power multiplexing module is mainly used to realize the superposition in the power domain of the data sent to different subscriber units at the same time and the same frequency, that is, to distinguish users by different powers. Among them, it includes: N user signal generation modules, multipliers, power distribution and adders, wherein, the user signal generation module is used to generate the downlink user data of the baseband, and its output connection enters the multiplier module together with the power distribution unit to realize the user Signal power adjustment; different user data are connected to the adder module through the output of their respective multipliers, thereby forming an electrical domain power multiplexing signal;

The user data generation module is mainly used for the generation of downlink user data signals, and the generated signal is an analog multi-carrier modulation signal, which can be an OFDM signal or a filtered OFDM signal. , it can also be a non-uniform filter bank-based OFDM signal, or a filter bank-based OFDM signal and other waveform signals conforming to the future mobile communication air interface;

The optical modulator module can be composed of a directly modulated laser, such as DFB, MYG, VCSEL or DBR; or a laser plus an external modulator, wherein the external modulator can be a Mach-Zehnder modulator, an electroabsorption modulator etc.; or a combination of laser plus modulator, such as EML;

The first wavelength division multiplexer may be an arrayed waveguide grating, or may be other wavelength division multiplexing devices with combining and branching functions;

The photoelectric conversion module may be a photodiode PIN or an avalanche diode APD;

The above-mentioned M is 4, 8, 16, 32, 64, 128, 256, 512 or 1024, and its specific value mainly depends on the number of wired and wireless user data accessed by the system;

The value of N mentioned above is any natural number greater than or equal to 2, such as 2, 3, .

The present invention will be described in more detail below with reference to specific embodiments.

As shown in Figure 1, this embodiment includes: mainly composed of a BBU (baseband processing unit) pool, a feeder fiber, a remote node, a number of distributed fibers, a number of remote radio units (referred to as RRU) units, and a number of user terminals ( UE); Wherein, the BBU pool is connected to the remote node through the feeder type optical fiber by the optical line terminal, and the output of the remote node is connected to the distributed optical fiber, and the distributed optical fiber output end connects the RRU unit, and the output of the RRU unit is sent through the air interface by the antenna to the UE, so as to realize the distribution of downlink data. For the convenience of analysis and description, we take the data corresponding to two user units in one BBU unit in the figure as an example for description, that is, M=1, N=2.

The basic structure of the BBU pool is shown in Figure 1, which includes M BBU units and a first wavelength division multiplexer, wherein the data of M=1 BBU unit is output and connected to the first wavelength division multiplexer. The multiplexing module is connected to the feeder fiber;

The structure of the BBU unit is shown in Figure 1, which is composed of an electrical domain power multiplexing module, an electrical amplifier and an optical modulator module; wherein, the output of the electrical domain power multiplexing module is connected to the electrical amplifier to realize the amplification of the user signal, and the output of the electrical amplifier connected to the optical modulator module for driving the optical modulator module; the output of the optical modulator module is connected to the first wavelength division multiplexer;

As shown in FIG. 1 , the electrical domain power multiplexing module is mainly used to realize the superposition of the data sent to UE1 and UE2 in the power domain, that is, to distinguish users by different powers. Including: a user signal 1 generation module, a user signal 2 generation module, a multiplier 1, a multiplier 2, a power distribution and an adder, wherein the user signal 1 generation module and the user signal 2 generation module together with the power gain allocated by the power distribution module Enter the multiplier 1 and the multiplier 2 respectively, and the output signals of the two multipliers are output and connected to the adder module, thereby forming the downlink electrical domain power multiplexing signal;

The remote node is composed of an optical splitter/splitter;

The RRU unit, as shown in Figure 1, includes an optical filter, a photoelectric conversion module, a power amplifier, and an antenna 1; the data signals from the distributed optical fiber to the subscriber units 1 and 2 are first connected to the optical filter through the distributed optical fiber output , the output of the optical filter is connected to the photoelectric conversion module, the output of the photoelectric conversion module is connected to the power amplifier, and the output of the power amplifier is connected to the antenna 1, thereby realizing the distribution of downlink data;

User terminal UE1, as shown in Figure 1, includes antennas 1,1, down-conversion, signal estimation and equalization module (estimated channel is H1), signal demodulation module 1, and user 1 signal acquisition; antennas 1,1 will receive The power multiplexed signal is sent to the down-conversion unit to realize the down-conversion of the signal, the output of the down-conversion reaches the channel estimation and equalization, and the output after the channel estimation and equalization enters the signal demodulation module 1, which is output by the signal demodulation module 1 and then connected to the user 1 Signal acquisition, so as to realize the reception of UE1 data;

The user terminal UE2, as shown in FIG. 1, includes: antennas 1, 2, down-conversion, first signal estimation and equalization H1, 2, signal demodulation module 2, user 1 signal acquisition, subtractor 1, channel H1, 2 The multiplication module with the data of user 1, the second signal estimation and the demodulation and acquisition of the signal of user 2 and user 2; wherein, the antennas 1 and 2 send the received power multiplexed signal to the down-conversion unit to realize the signal conversion. Down-conversion, the output of the down-conversion reaches channel estimation and equalization (the estimated channel is H1, 2), and the output after channel estimation and equalization enters the signal demodulation module 1, and is output by the signal demodulation module 1 and then connected to the user 1 signal acquisition; The user 1 signal goes through the channel H1, 2 and the user data multiplication module and enters the subtraction 1 together with the down-converted signal received by the antenna 1, 2, thereby removing the user 1 signal data; the output signal of the subtractor and the channel estimation and equalization ( The estimated channel is H1, 2) enters the demodulation and acquisition module of the user 2 signal, thereby realizing the reception of the user 2 data;

Among them, the optical modulator module can be composed of a directly modulated laser, such as DFB, MYG, VCSEL or DBR; or composed of a laser plus an external modulator, wherein the external modulator can be a Mach-Zehnder modulator, an electroabsorption modulator etc.; or a combination of laser plus modulator, such as EML;

Wherein, the first wavelength division multiplexer may be an arrayed waveguide grating, or may be other wavelength division multiplexing devices with combining and branching functions;

The photoelectric conversion module can be a photodiode PIN or an avalanche diode APD;

Among them, the above-mentioned M is 4, 8, 16, 32, 64, 128, 256, 512 or 1024, and its specific value mainly depends on the number of wired and wireless user data accessed by the system;

Wherein, the above-mentioned N value is any natural number greater than or equal to 2, such as 2, 3, .

Further, the constellation diagrams of the low-power user and the high-power user are shown in Fig. 2(a) and Fig. 2(b), respectively.

The up-converted frequency domain waveform of the power multiplexed signal is shown in Figure 3.

This embodiment proposes a wireless fronthaul system for analog optical transmission for 5G power multiplexing, and provides a high-capacity, high-rate, and high-spectral-efficiency analog optical transmission system based on optical and wireless fronthaul transmission. The invention adopts the power multiplexing technology, and in the multiplexing dimension of the power boosting system, on the one hand, the same wavelength can be used to carry multiple data information; The analog subband interference problem caused by the use. These advantages can enable the fronthaul system proposed by the present invention to obtain: 1) the use of optoelectronic devices with low modulation bandwidth to achieve high-speed transmission rate, which can reduce the cost of future system capacity upgrades to a certain extent; 2) make full use of multiplexing in the power domain technology, which can improve the spectral efficiency of the system and increase the transmission capacity of the fronthaul system.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.

Claims (9)

1. a wireless fronthaul system for the analog optical transmission of 5G power multiplexing, is characterized in that, comprising: BBU pool, feeder fiber, remote node, distributed fiber, some user terminals UE and some radio frequency remote Unit, that is, several RRU units; among them: The BBU pool is connected to the remote node through the optical line terminal through the feeder fiber, the output end of the remote node is connected to the input end of the distributed fiber, the output end of the distributed fiber is connected to the RRU unit, and the output end of the RRU unit is connected. sent to the user terminal UE through the antenna through the air interface; The user terminal UE is used to demodulate the received power multiplexed signal; specifically, according to the difference between the BBU pool and the user terminal UE, different transmit powers are used to transmit the signal; For the user terminal UE whose distance is greater than or equal to the set threshold, the signal received by the antenna is first subjected to down-conversion and then subjected to signal estimation and equalization processing, and the signal that has undergone signal estimation and equalization processing is demodulated by the signal demodulation module and sent to the user; For a user terminal UE whose distance is less than the set threshold, the signal received by the antenna is first subjected to down-conversion, and a part of the down-converted signal is subjected to signal estimation and equalization processing, and the signal after signal estimation and equalization processing is demodulated by the signal demodulation module. It is sent to the acquisition unit of the high-power allocated user in the power multiplexed signal, thereby obtaining high-power user data; after the high-power user data is multiplied by the frequency domain data of the channel response, it is combined with another part of the down-converted signal. Connected to the subtractor module to obtain the baseband modulated signal of the low-power user, the baseband modulated signal is subjected to signal estimation and equalization processing, and the signal after signal estimation and equalization processing is transmitted to the demodulation module for demodulation and sent to the user. 2. the wireless fronthaul system for the analog optical transmission of 5G power multiplexing according to claim 1, is characterized in that, described BBU pool comprises: M BBU units and the first wavelength division multiplexer, M BBU units The output end is connected to the input end of the feeder fiber through the first wavelength division multiplexer; the value of M depends on the number of wired and wireless user data accessed by the system, and the value of M is a natural number greater than 1, including 4 , 8, 16, 32, 64, 128, 256, 512 or 1024; The BBU unit, that is, the baseband processing unit, includes: an electrical domain power multiplexing module, an electrical amplifier and an optical modulator module; the output end of the electrical domain power multiplexing module is connected to the input end of the electrical amplifier for realizing user signal amplification; the output of the electrical amplifier is connected to the input end of the optical modulator module for driving the optical modulator module; the output end of the optical modulator module is connected to the first wavelength division multiplexer for realizing the optical signal modulation. 3. The wireless fronthaul system for analog optical transmission of 5G power multiplexing according to claim 1, wherein the remote node is: an optical splitter\combiner for realizing the distribution of downlink user data . 4. The wireless fronthaul system for analog optical transmission for 5G power multiplexing according to claim 1, wherein the RRU unit comprises: an optical filter, a photoelectric conversion module, a power amplifier and an antenna; The signal of the device is transmitted to the user terminal UE through the antenna after passing through the optical filter, the photoelectric conversion module, and the power amplifier in turn; wherein: The optical filter is used for filtering the signal sent by the distributed optical fiber; The photoelectric conversion module is used to convert the filtered optical signal into a corresponding electrical signal; The power amplifier is used to amplify the electrical signal and transmit it to the antenna. 5. The wireless fronthaul system for 5G power multiplexing-oriented analog optical transmission according to claim 2, wherein the electrical domain power multiplexing module comprises: N user signal generation modules, multipliers, and power distribution units And an adder, wherein N is a natural number greater than or equal to 1; the output end of the user signal generation module, the output end of the power distribution unit are all connected to the input end of the multiplier, and the output end of the multiplier is connected to the input end of the adder The output end of the adder constitutes the output end of the electrical domain power multiplexing module, which is used to output the electrical domain power multiplexing signal; the user signal generation module is used to generate the baseband downlink user data, and the power distribution unit is used to Realize the power adjustment of downlink user data. 6. The wireless fronthaul system for the analog optical transmission of 5G power multiplexing according to any one of claims 1 to 5, characterized in that, further comprising a user data generation module, the user data generation module being used to generate downlink users Data signal; the downlink user data signal is a waveform signal conforming to the future mobile communication air interface, including: OFDM signal, filtered OFDM signal, non-uniform filter group-based OFDM signal Either a division multiplexed signal or a filter bank-based orthogonal frequency division multiplexed signal. 7. The wireless fronthaul system for the analog optical transmission of 5G power multiplexing according to claim 2, wherein the optical modulator module comprises: a DFB laser, a MYG laser, a VCSEL laser, a DBR laser, or a laser plus Any form of external modulator, or laser plus modulator; the external modulator includes: Mach-Zehnder modulator, electro-absorption modulator. 8 . The wireless fronthaul system for analog optical transmission for 5G power multiplexing according to claim 2 , wherein the first wavelength division multiplexer is a wavelength division multiplexing device with combining and branching functions. 9 . , including: arrayed waveguide grating. 9 . The wireless fronthaul system for analog optical transmission for 5G power multiplexing according to claim 4 , wherein the photoelectric conversion module comprises: any one of a photodiode PIN and an avalanche diode APD. 10 .

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