CN106304420B - Wireless forward transmission system for 5G power multiplexing-oriented analog optical transmission - Google Patents
Wireless forward transmission system for 5G power multiplexing-oriented analog optical transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a wireless forward transmission system for 5G power multiplexing-oriented analog optical transmission, which comprises: the system comprises a BBU pool, a feeder fiber, a remote node, a distributed fiber, a user terminal UE and an RRU unit; the BBU pool is connected to a remote node through an optical line terminal via a feeder fiber, an output end of the remote node is connected to an input end of a distributed fiber, an output end of the distributed fiber is connected to an RRU unit, and an output end of the RRU unit is transmitted to user terminal UE via an antenna via an air interface. The invention realizes the multiplexing of analog signals based on subcarrier modulation in signal power dimension, improves the spectrum efficiency in future mobile communication systems and increases the transmission capacity. In addition, the invention also distinguishes different user data by the size of the superposed signal power, and realizes the multiplexing of power by selecting the power size according to the distance between the user and the base station processing unit, thereby solving the problem of system performance imbalance caused by the distance effect of the wireless terminal access user.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wireless fronthaul system for analog optical transmission facing 5G power multiplexing.
Background
With the rapid development of communication technology and the continuous evolution of technical standards, the fourth generation mobile communication technology (4G) has enabled the data service transmission rate to reach hundreds of megabits per second or even gigabits, thereby meeting the application requirements of certain broadband mobile communication to a certain extent. However, as the popularization of intelligent terminals, the application of intelligent terminals and the demand of new mobile services continue to increase, the demand of wireless transmission rate increases exponentially, and the transmission rate of wireless communication will still have difficulty in meeting the application demand of future mobile communication. Furthermore, according to the "white paper of 5G vision and demand" proposed by the 5G propulsion group (IMT-2020), the future 5G wireless network needs to satisfy higher spectrum efficiency, faster access rate, and larger access capacity, wherein the spectrum efficiency is improved by 5-15 times compared with 4G. Meanwhile, with the increasing rate and capacity, Radio Access Network (RAN) is facing an unprecedented challenge as an important asset for mobile operators to live on: 1) the RAN access capability is improved by enhancing the air interface capability, which brings high energy consumption; 2) high RAN Capital Expenditure (CAPEX, potential export) and Operating costs (OPEX, Operating export); 3) tidal effects of user traffic, resulting in low base station utilization; 4) the access flows of users and the income of operators increase disproportionately severely. The developing 5G mobile communication is more capable of meeting the increasing demand of mobile service traffic through the characteristics of higher spectrum efficiency, more spectrum resources, denser cell deployment and the like. Therefore, based on the above challenges, a new radio access network architecture needs to be introduced into a future mobile communication system to improve the competitiveness of the network.
A radio access network C-RAN fusing 4C (Clean, Cooperative and Cloud) features is based on a distributed base station, and realizes network resource sharing and dynamic load balancing through base band Centralized processing, a Cooperative radio technology and an infrastructure based on Cloud computing. The technology can provide larger and more flexible bandwidth access and support more operation standards, not only is the mainstream access scheme in the current LTE era, but also accords with the development trend of an access network architecture of 5G mobile communication. The C-RAN is composed of a base station Processing Unit (BBU), a Radio Remote Unit (RRU), and a transmission fiber link between the BBU and the RRU. The RRU is an air interface downward, the BBU is a network side interface upward, and a 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, data transmission from the RRU to the BBU is called radio fronthaul (frontaul), and data accessed by a conventional macro base station or a small cell is backhaul (backhaul). Under the C-RAN architecture, radio access is mainly referred to as frontaul (radio forward). Currently, a wireless forward transport bearer oriented to the C-RAN mainly includes an Optical fiber direct drive, an Optical Transport Network (OTN), a Passive Optical Network (PON) system, and the like. The optical fiber direct drive scheme is based on the optical fiber direct drive method, and therefore more optical fiber resources are occupied, and the construction and maintenance cost and difficulty are higher; although optical fiber resources can be saved based on the OTN scheme, the system equipment is high in price and is difficult to meet the requirement of forward data on frequency jitter; the scheme based on the PON can reuse the optical fiber network of the prior PON system, save optical fiber resources and reduce the upgrading cost of the wireless access network.
Therefore, for a 5G access network, how to efficiently implement access data transmission by an optical fiber transmission technology with the aid of an optical fiber access network system, that is, how to implement transmission of wireless forward data with high speed, large capacity and high spectrum efficiency by an existing optical fiber access network system, is one of the hot spots and difficulties of current research. The existing literature search finds that the current wireless forward transmission system based on the optical fiber access network is mainly developed from two aspects of digital and analog, and various different technologies are adopted to improve the capacity and the transmission rate of the system. For example, Xiang Liu, Huaiyu Zeng et al published a band-effective mobile front Transmission for Future 5G Wireless Networks (ACP) in 2015 asia ethernet Conference, and proposed to use an analog subcarrier modulation technique to obtain aggregation of Transmission data by signal modulation on different subcarriers, thereby increasing the Wireless access rate. However, the subcarrier modulation technology-based scheme is essentially frequency reuse, and needs to expand frequency resources to achieve an increase in the capacity of the access system. In addition, as the number of aggregated carriers of the system increases, that is, the bandwidth required for transmitting analog signals increases, the linearity of the optoelectronic device in the optical access network system is increased to a certain extent, so that the cost is greatly increased due to the expansion of the system.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wireless fronthaul system for 5G power multiplexing-oriented analog optical transmission.
The wireless fronthaul system facing the 5G power multiplexing analog optical transmission provided by the invention comprises: the system comprises a BBU pool, a feeder fiber, a remote node, a distributed fiber, a plurality of user terminals (UE) and a plurality of Remote Radio Units (RRU); wherein:
the BBU pool is connected to a remote node through an optical line terminal via a feeder fiber, an output end of the remote node is connected to an input end of a distributed fiber, an output end of the distributed fiber is connected to an RRU unit, and an output end of the RRU unit is transmitted to user terminal UE via an air interface via an antenna.
Preferably, the BBU pool comprises: the output ends of the M BBU units are connected to the input end of the feeder optical fiber through the first wavelength division multiplexer; the value of M is mainly determined by the number of wired and wireless user data accessed by the system, and is a natural number greater than 1, including 4, 8, 16, 32, 64, 128, 256, 512 or 1024;
the BBU unit, namely a baseband processing unit, includes: the optical modulator comprises an electric domain power multiplexing module, an electric amplifier and an optical modulator module; the output end of the electric domain power multiplexing module is connected to the input end of the electric amplifier and used for realizing the amplification of user signals; the output of the electric amplifier is connected to the input end of the optical modulator module and used for driving the optical modulator module; the output end of the optical modulator module is connected to the first wavelength division multiplexer and used for achieving modulation of the optical signals.
Preferably, the remote node is: and the optical branching/combining device is used for realizing the distribution of the downlink user data.
Preferably, the RRU unit includes: the device comprises an optical filter, a photoelectric conversion module, a power amplifier and an antenna; signals sent by the distributed optical fiber sequentially pass through the optical filter, the photoelectric conversion module and the power amplifier and then are transmitted to the user terminal UE through the antenna; wherein:
the optical filter is used for filtering signals sent by the distributed optical fibers;
the photoelectric conversion module is used for converting the optical signals subjected to filtering processing into corresponding electric signals;
the power amplifier is used for amplifying the electric signal and transmitting the electric signal to the antenna.
Preferably, the user equipment UE is configured to demodulate the received power multiplexing signal; specifically, different transmitting powers are adopted to transmit signals according to different distances between the BBU pool and the user terminal UE;
for the user terminal UE with the distance larger than or equal to the set threshold, the signals received by the antenna are subjected to down-conversion and then subjected to signal estimation and equalization processing, and the signals subjected to the signal estimation and equalization processing are demodulated by a signal demodulation module and then sent to the user;
for the user terminal UE with the distance less than the set threshold, the signals received by the antenna firstly pass through down-conversion, part of the signals after down-conversion are subjected to signal estimation and equalization processing, and the signals after signal estimation and equalization processing are demodulated by a signal demodulation module and then sent to an acquisition unit of a high-power distribution user in the power multiplexing signals, so that high-power user data are obtained; the high-power user data is multiplied by frequency domain data responded by a channel, and then is connected with the other part of signals after down-conversion together with a subtracter module so as to obtain baseband modulation signals of the low-power user, the baseband modulation signals are subjected to signal estimation and equalization processing, and the signals subjected to the signal estimation and equalization processing are transmitted to a demodulation module for demodulation and then are sent to the user.
Preferably, the electric domain power multiplexing module includes: the system comprises N user signal generating modules, a multiplier, a power distribution unit and an adder, wherein N is a natural number which is more than or equal to 1; the output end of the user signal generation module and the output end of the power distribution unit are both 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 forms the output end of the electric domain power multiplexing module and is used for outputting an electric domain power multiplexing signal; the user signal generating module is used for generating downlink user data of a baseband, and the power distribution unit is used for realizing power adjustment of the downlink user data.
Preferably, the device further comprises a user data generating module, wherein the user data generating module is used for generating a downlink user data signal; the downlink user data signal is a waveform signal conforming to a future mobile communication air interface, and comprises: any of an orthogonal frequency division multiplexing signal, a filtered orthogonal frequency division multiplexing signal, a non-uniform filter bank based orthogonal frequency division multiplexing signal, a filter bank based orthogonal frequency division multiplexing signal.
Preferably, the light modulator module includes: any one form of DFB laser, MYG laser, VCSEL laser, DBR laser, or laser plus external modulator, or laser plus modulator; the external modulator includes: Mach-Zehnder modulators, electro-absorption modulators.
Preferably, the first wavelength division multiplexer is a wavelength division multiplexing device having a combining function and a splitting function, and includes: an arrayed waveguide grating.
Preferably, the photoelectric conversion module includes: photodiode PIN, avalanche diode APD.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the power multiplexing technology, and on the one hand, the same wavelength can be used for bearing multiple times of data information in the multiplexing dimension of the power boosting system; on the other hand, the problem of analog sub-band interference caused by multiplexing of a plurality of sub-carriers during mass data transmission can be better solved.
2. The invention realizes high-speed transmission rate by using the photoelectric device with low modulation bandwidth, and can reduce the cost of upgrading system capacity in the future to a certain extent.
3. The invention fully utilizes the multiplexing technology of the power domain, can improve the spectral efficiency of the system and increase the transmission capacity of the forward transmission system.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a detailed schematic diagram of an analog optical transmission system based on power multiplexing for use in a 5G wireless forwarding network according to the present invention;
FIG. 2 is a comparison of constellation diagrams for high and low power users; fig. 2(a) is a constellation diagram of a low power user, and fig. 2(b) is a constellation diagram of a high power user;
fig. 3 shows the up-converted signal after power multiplexing.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The wireless fronthaul system facing the 5G power multiplexing analog optical transmission provided by the invention comprises: the system comprises a BBU (baseband processing unit) pool, a feeder fiber, a remote node, a plurality of distributed fibers, a plurality of Radio Remote Units (RRU) and a plurality of user terminals (UE), wherein the BBU pool is connected to the remote node through the feeder fiber by an optical line terminal, the output of the remote node is connected to the distributed fibers, the output end of the distributed fibers is connected with the RRU, and the output of the RRU is sent to the UE through an air interface by an antenna, so that the distribution of downlink data is realized;
the BBU pool is characterized by comprising M BBU units and a first wavelength division multiplexer, wherein the data of the M BBU units are output and then connected to the first wavelength division multiplexer, and a first wavelength division multiplexing module is connected to a feeder optical fiber;
the BBU unit is characterized by comprising an electric domain power multiplexing module, an electric amplifier and an optical modulator module; the output of the electric domain power multiplexing module is connected to an electric amplifier to realize the amplification of a user signal, and the output of the electric amplifier is connected to the optical modulator module and used for driving the optical modulator module; the output of the optical modulator module is connected to the first wavelength division multiplexer;
the remote node is characterized in that the distribution of the downlink user data can be realized; composed of an optical splitter/combiner (splitter);
the RRU is characterized in that the main downlink user data is received; the device mainly comprises an optical filter, a photoelectric conversion module, a power amplifier and an antenna; the distributed optical fiber outputs data signals reaching the user unit to be 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 that downlink data distribution is realized;
the UE is configured to mainly complete demodulation of a power multiplexed signal; according to the principle of power multiplexing signal generation, different transmission powers are adopted for UE users located at different distances from the BBU pool (high transmission power is adopted for users located at a distance, and low transmission power is adopted for users located at a closer distance), so that the receiving modules at the UE end are different for users with different powers. 1) For a user with a long distance, signals received by the antenna enter 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, so that the reception of the user data is realized; 2) for a user with a short distance, a signal received by an antenna is connected to down-conversion, one part of the down-converted signal is connected to channel estimation and equalization of the user side, the output of the signal estimation and equalization signal is connected to signal demodulation, and the output of the signal demodulation is connected to an acquisition unit of a high-power distribution user in the power multiplexing signal, so that high-power user data is obtained; after the high-power user data is multiplied by the content of a channel response in a frequency domain, the high-power user data and the other part of the down-conversion output are connected to a subtractor module together to obtain a baseband modulation signal of the low-power user, the signal is connected to signal estimation and equalization, the output of the signal estimation and equalization is connected to a signal demodulation module, and the output of the signal demodulation reaches the acquisition of the user data, so that the reception of the user data is realized;
the electric domain power multiplexing module is mainly used for realizing superposition of data sent to different subscriber units in a power domain at the same time and the same frequency, namely, the users are distinguished by different powers. Wherein, include: the system comprises N user signal generating modules, a multiplier, power distribution and an adder, wherein the user signal generating modules are used for generating downlink user data of a baseband, and the output connection of the user signal generating modules and a power distribution unit enter the multiplier module together to realize power adjustment of user signals; different user data are connected to the adder module through the output of each multiplier, so as to form an electric domain power multiplexing signal;
the user data generating module is mainly used for generating downlink user data signals, and the generated signals are analog multi-carrier modulation signals, orthogonal frequency division multiplexing signals, filtered orthogonal frequency division multiplexing signals, non-uniform orthogonal frequency division multiplexing signals based on filter groups, waveform signals conforming to air interfaces of future mobile communication, such as orthogonal frequency division multiplexing signals based on filter groups and the like;
the optical modulator module can be formed by a direct modulation laser, such as DFB, MYG, VCSEL or DBR; or the laser and the external modulator, wherein the external modulator can be a Mach-Zehnder modulator, an electro-absorption modulator, and the like; or a combination of a laser plus modulator, such as EML;
the first wavelength division multiplexer can be an array waveguide grating, and also can be other wavelength division multiplexing devices with combining and splitting functions;
the photoelectric conversion module can be a photodiode PIN or an avalanche diode APD;
m mentioned above is 4, 8, 16, 32, 64, 128, 256, 512 or 1024, and the specific value thereof mainly depends on the number of wired and wireless user data accessed by the system;
the above-mentioned N value is any natural number greater than or equal to 2, such as 2, 3, … …, etc., and its specific value mainly depends on the data amount of the distributing user.
The present invention will be described in more detail with reference to specific examples.
As shown in fig. 1, the present embodiment includes: the system mainly comprises a BBU (base band unit) pool, a feeder optical fiber, a remote node, a plurality of distributed optical fibers, a plurality of Radio Remote Units (RRU) units and a plurality of user terminals (UE); the BBU pool is connected to a remote node through an optical line terminal via a feeder fiber, the output of the remote node is connected to a distributed fiber, the output end of the distributed fiber is connected to an RRU unit, and the output of the RRU unit is transmitted to the UE through an antenna via an air interface, so that downlink data distribution is realized. For the convenience of analysis and description, we take the example that two user unit data are corresponded in one BBU unit in the figure, i.e. M is 1 and N is 2.
The basic structure of the BBU pool is shown in fig. 1, and includes M BBU units and a first wavelength division multiplexer, where M ═ 1 BBU units have data output and then are connected to the first wavelength division multiplexer, and a first wavelength division multiplexing module is connected to a feeder optical fiber;
the BBU unit structure is shown in FIG. 1 and is composed of an electric domain power multiplexing module, an electric amplifier and an optical modulator module; the output of the electric domain power multiplexing module is connected to an electric amplifier to realize the amplification of a user signal, and the output of the electric amplifier is connected to the optical modulator module and used 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 implement superposition on the data transmitted to the UE1 and the UE2 in the power domain, i.e. to distinguish users by different powers. The method comprises the following steps: the system comprises a user signal 1 generating module, a user signal 2 generating module, a multiplier 1, a multiplier 2, power distribution and an adder, wherein the user signal 1 generating module and the user signal 2 generating module respectively enter the multiplier 1 and the multiplier 2 together with power gains distributed by the power distribution module, and output signals of the two multipliers are connected to the adder module, so that a downlink electric domain power multiplexing signal is formed;
a remote node, which is composed of an optical splitter/combiner (splitter);
the RRU unit, as shown in fig. 1, includes an optical filter, a photoelectric conversion module, a power amplifier, and an antenna 1; the distributed optical fiber outputs data signals reaching the subscriber units 1 and 2 to be 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 1, so that the distribution of downlink data is realized;
as shown in fig. 1, the UE1 includes an antenna 1, a down-conversion module, a signal estimation and equalization module (an estimated channel is H1), a signal demodulation module 1, and a user 1 signal acquisition module; the antenna 1,1 sends the received power multiplexing signal to a down-conversion unit to realize down-conversion of the signal, the output of the down-conversion reaches channel estimation and equalization, the output after the channel estimation and equalization enters the signal demodulation module 1, and the signal demodulation module 1 is connected to the user 1 signal to obtain the signal, so that the reception of the UE1 data is realized;
the user terminal UE2, as shown in fig. 1, includes: the system comprises antennas 1,2, down-conversion, a first signal estimation and homogeneous H1,2, a signal demodulation module 2, user 1 signal acquisition, a subtracter 1, a channel H1,2 and user 1 data multiplication module, a second signal estimation and homogeneous H1,2 and user 2 signal demodulation and acquisition; the antennas 1 and 2 transmit the received power multiplexing signal to a down-conversion unit to realize down-conversion of the signal, the down-converted output reaches channel estimation and equalization (the estimated channel is H1 and 2), the output after the channel estimation and equalization enters the signal demodulation module 1, and the signal demodulation module 1 outputs the output and then connects to the user 1 for signal acquisition; the user 1 signal passes through a channel H1,2 and user data multiplication module and then enters 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 subtracter and the channel estimation and equalization (the estimated channel is H1,2) enter the demodulation and acquisition module of the user 2 signal, thereby realizing the reception of the user 2 data;
the optical modulator module can be formed by a direct modulation laser, such as DFB, MYG, VCSEL or DBR; or the laser and the external modulator, wherein the external modulator can be a Mach-Zehnder modulator, an electro-absorption modulator, and the like; or a combination of a laser plus modulator, such as EML;
the first wavelength division multiplexer can be an array waveguide grating, and can also be other wavelength division multiplexing devices with combining and splitting functions;
the photoelectric conversion module can be a photodiode PIN or an avalanche diode APD;
wherein, M is 4, 8, 16, 32, 64, 128, 256, 512 or 1024, and the specific value mainly depends on the number of wired and wireless user data accessed by the system;
the N value is any natural number of 2 or more, such as 2, 3, … …, or the like, and the specific value thereof mainly depends on the data amount of the distribution user.
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 fig. 3.
The embodiment provides a wireless fronthaul system for 5G power multiplexing-oriented analog optical transmission, and provides a high-capacity, high-rate and high-spectrum-efficiency analog optical transmission system based on optical and wireless fronthaul transmission. The invention adopts the power multiplexing technology, and on the one hand, the same wavelength can be used for bearing multiple times of data information in the multiplexing dimension of the power boosting system; on the other hand, the problem of analog sub-band interference caused by multiplexing of a plurality of sub-carriers during mass data transmission can be better solved. These advantages make it possible to obtain the forwarding system proposed by the present invention: 1) the photoelectric device with low modulation bandwidth is used for realizing the transmission rate with high rate, and the cost problem of upgrading the system capacity in the future can be reduced to a certain extent; 2) the multiplexing technology of the power domain is fully utilized, the system spectrum efficiency can be improved, and the transmission capacity of a forward transmission system can be increased.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A wireless fronthaul system for 5G power multiplexed analog optical transmission, comprising: the system comprises a BBU pool, a feeder fiber, a remote node, a distributed fiber, a plurality of user terminals (UE) and a plurality of Remote Radio Units (RRU); wherein:
the BBU pool is connected to a remote node through an optical line terminal via a feeder fiber, the output end of the remote node is connected to the input end of a distributed fiber, the output end of the distributed fiber is connected to an RRU unit, and the output end of the RRU unit is sent to a user terminal UE via an air interface via an antenna;
the user terminal UE is used for demodulating the received power multiplexing signal; specifically, different transmitting powers are adopted to transmit signals according to different distances between the BBU pool and the user terminal UE;
for the user terminal UE with the distance larger than or equal to the set threshold, the signals received by the antenna are subjected to down-conversion and then subjected to signal estimation and equalization processing, and the signals subjected to the signal estimation and equalization processing are demodulated by a signal demodulation module and then sent to the user;
for the user terminal UE with the distance less than the set threshold, the signals received by the antenna firstly pass through down-conversion, part of the signals after down-conversion are subjected to signal estimation and equalization processing, and the signals after signal estimation and equalization processing are demodulated by a signal demodulation module and then sent to an acquisition unit of a high-power distribution user in the power multiplexing signals, so that high-power user data are obtained; the high-power user data is multiplied by frequency domain data responded by a channel, and then is connected with the other part of signals after down-conversion together with a subtracter module so as to obtain baseband modulation signals of the low-power user, the baseband modulation signals are subjected to signal estimation and equalization processing, and the signals subjected to the signal estimation and equalization processing are transmitted to a demodulation module for demodulation and then are sent to the user.
2. The 5G power multiplexed oriented wireless fronthaul system for analog optical transmission of claim 1 wherein the BBU pool comprises: the output ends of the M BBU units are connected to the input end of the feeder optical fiber through the first wavelength division multiplexer; wherein 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, namely a baseband processing unit, includes: the optical modulator comprises an electric domain power multiplexing module, an electric amplifier and an optical modulator module; the output end of the electric domain power multiplexing module is connected to the input end of the electric amplifier and used for realizing the amplification of user signals; the output of the electric amplifier is connected to the input end of the optical modulator module and used for driving the optical modulator module; the output end of the optical modulator module is connected to the first wavelength division multiplexer and used for achieving modulation of the optical signals.
3. The wireless forwarding system for 5G power multiplexed oriented analog optical transmission of claim 1, wherein the remote node is: and the optical branching/combining device is used for realizing the distribution of the downlink user data.
4. The 5G power multiplexing oriented wireless fronthaul system for analog optical transmission according to claim 1, wherein the RRU unit comprises: the device comprises an optical filter, a photoelectric conversion module, a power amplifier and an antenna; signals sent by the distributed optical fiber sequentially pass through the optical filter, the photoelectric conversion module and the power amplifier and then are transmitted to the user terminal UE through the antenna; wherein:
the optical filter is used for filtering signals sent by the distributed optical fibers;
the photoelectric conversion module is used for converting the optical signals subjected to filtering processing into corresponding electric signals;
the power amplifier is used for amplifying the electric signal and transmitting the electric signal to the antenna.
5. The wireless fronthaul system for 5G power multiplexed oriented analog optical transmission of claim 2, wherein the electric domain power multiplexing module comprises: the system comprises N user signal generating modules, a multiplier, a power distribution unit and an adder, wherein N is a natural number which is more than or equal to 1; the output end of the user signal generation module and the output end of the power distribution unit are both 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 forms the output end of the electric domain power multiplexing module and is used for outputting an electric domain power multiplexing signal; the user signal generating module is used for generating downlink user data of a baseband, and the power distribution unit is used for realizing power adjustment of the downlink user data.
6. The wireless forwarding system for 5G power multiplexing oriented analog optical transmission according to any one of claims 1 to 5, further comprising a user data generation module, wherein the user data generation module is configured to generate a downlink user data signal; the downlink user data signal is a waveform signal conforming to a future mobile communication air interface, and comprises: any of an orthogonal frequency division multiplexing signal, a filtered orthogonal frequency division multiplexing signal, a non-uniform filter bank based orthogonal frequency division multiplexing signal, a filter bank based orthogonal frequency division multiplexing signal.
7. The wireless fronthaul system for 5G power multiplexed oriented analog optical transmission of claim 2, wherein the optical modulator module comprises: any one form of DFB laser, MYG laser, VCSEL laser, DBR laser, or laser plus external modulator, or laser plus modulator; the external modulator includes: Mach-Zehnder modulators, electro-absorption modulators.
8. The wireless forwarding system for 5G power multiplexed analog optical transmission according to claim 2, wherein the first wavelength division multiplexer is a wavelength division multiplexing device with combining and splitting functions, and comprises: an arrayed waveguide grating.
9. The wireless fronthaul system for 5G power multiplexed oriented analog optical transmission of claim 4, wherein the optical-to-electrical conversion module comprises: photodiode PIN, avalanche diode APD.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US10070432B1 (en) | 2017-03-02 | 2018-09-04 | Micron Technology, Inc. | Wireless devices and systems including examples of configuration modes for baseband units and remote radio heads |
| US10716110B2 (en) | 2017-03-02 | 2020-07-14 | Micron Technology, Inc. | Wireless devices and systems including examples of configuration modes for baseband units and remote radio heads |
| CN108494490B (en) * | 2018-04-09 | 2019-10-25 | 湖北邮电规划设计有限公司 | A kind of wireless 5G forward pass and the network-building method of other service integrations carrying |
| CN108847891B (en) * | 2018-05-30 | 2020-10-13 | 武汉虹信通信技术有限责任公司 | Radio over fiber distributed small base station system |
| CN115426045A (en) * | 2019-12-09 | 2022-12-02 | 华为技术有限公司 | Central unit and remote unit |
| CN116418403A (en) * | 2021-12-31 | 2023-07-11 | 华为技术有限公司 | Method, device and system for optical communication |
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