CN110875777A - Multi-frequency multi-mode distributed access system - Google Patents
Multi-frequency multi-mode distributed access system Download PDFInfo
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- CN110875777A CN110875777A CN201811007556.8A CN201811007556A CN110875777A CN 110875777 A CN110875777 A CN 110875777A CN 201811007556 A CN201811007556 A CN 201811007556A CN 110875777 A CN110875777 A CN 110875777A
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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
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
- H04B10/25759—Details of the reception of RF signal or the optical conversion before the optical fibre
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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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- 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
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Abstract
The invention discloses a multi-frequency multi-system distributed access system which comprises an access unit, a distribution aggregation unit and a remote coverage unit, wherein the access unit can access radio frequency signals of more than 5 frequency bands, covers the access of information source signals with the frequency band range of 300 MHz-3.5 GHz, and transmits the information source signals to the distribution aggregation unit or the remote coverage unit after digital signal processing through data compression so as to fulfill the aim of remote transmission and coverage of the information source. Compared with the traditional access system, the system has the advantages that the cost is reduced in the aspects of property coordination and construction, opening efficiency and maintenance management.
Description
Technical Field
The invention relates to a distributed access system, in particular to a multi-frequency multi-mode distributed access system.
Background
With the increase of mobile communication system systems, the types and the number of communication devices are also obviously increased, so that the difficulty of network construction is increased, and the problems of complexity of a network coverage scheme, limitation of machine room space, increase of network construction cost and the like are solved.
Currently, 2G, 3G and 4G networks will coexist for a longer period of time, and there will be 5G networks in the future. The single-standard equipment is used, operators need to use a plurality of sets of single-frequency-band systems to construct a mobile communication system, and in order to connect various corresponding systems, the defects of complicated mechanisms and configuration of the equipment for connecting the systems, more consumed optical fiber resources, large occupied area, high connection messy cost and the like can be caused, so that the system is not suitable for large-scale popularization and application.
That is to say, the existing single band access system or multi-band access system generally has the following disadvantages: 1. limited by the frequency selectivity of the radio frequency front end, the 5G hardware in the later stage is inconvenient to upgrade and expand, and the potential cost is increased. 2. Limited by transmission bandwidth, the access unit and the remote covering unit can not meet the requirements of mainstream wireless mobile communication and wired transparent transmission; 3. covering of dense traffic scenes such as large-scale venues and business circles requires introduction of second, third and even fourth information source sectors, and the traditional solution is to add an independent system for covering, so that networking is not flexible and management is complex.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multi-frequency multi-mode distributed access system.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-frequency multi-mode distributed access system comprises an access unit and a remote coverage unit connected with the access unit, wherein,
the access unit is used for accessing information source signals of a plurality of frequency bands in a downlink, sequentially performing signal attenuation, analog-to-digital conversion and down-conversion on the information source signals after performing uplink and downlink separation to obtain downlink digital signals, and transmitting the downlink digital signals to the far-end covering unit through optical fibers after data compression and optical/electrical conversion; the optical transceiver is used for receiving an uplink digital optical signal transmitted by the remote covering unit in an uplink, and sequentially performing optical/electrical conversion, up-conversion, digital-to-analog conversion and signal amplification on the digital optical signal to obtain an uplink radio frequency signal for transmission; the information source signals comprise radio frequency signals of 5 frequency bands, and cover the access of the information source signals with the frequency band range of 300 MHz-3.5 GHz;
the remote covering unit is used for processing digital signals of signals from the access unit in a downlink, then outputting the signals after performing power amplification after sequentially performing down-conversion and digital-to-analog conversion to obtain radio-frequency signals, and outputting the signals to the access unit after sequentially performing low-noise amplification, analog-to-digital conversion and up-conversion to obtain digital signals after separating the received uplink signals in an uplink.
Preferably, the access unit may connect to one or more distribution convergence units, each of the distribution convergence units may be cascaded to one or more, and each of the distribution convergence units connects to a plurality of remote coverage units.
Preferably, the system further includes an auxiliary information source access unit having the same hardware structure as the access unit, and the auxiliary information source access unit is connected to the distribution convergence unit or the remote coverage unit.
Preferably, the access unit includes a first digital radio frequency integrated module and a first digital optical module connected to the first digital radio frequency integrated module, the first digital radio frequency integrated module accesses the information source signals of multiple frequency bands in a downlink, and includes a plurality of connected near-end signal processing modules, a plurality of first analog/digital conversion modules and a first frequency conversion module in an integrated manner, the information source signal of each frequency band corresponds to one near-end signal processing module and one first analog/digital conversion module, the near-end signal processing module is configured to perform signal attenuation and output to the first analog/digital conversion module after performing uplink and downlink separation on the information source signal in the downlink, or perform filtering and output after amplifying the uplink radio frequency signal converted by the first analog/digital conversion module in the uplink; the first analog/digital conversion module is used for performing analog-to-digital conversion on the information source signal in a downlink or performing digital-to-analog conversion on the uplink signal in an uplink to output an audio signal; the first frequency conversion module is used for carrying out down-conversion on a source signal in a downlink or carrying out up-conversion on an uplink signal in an uplink.
Preferably, the near-end signal processing module includes a first duplex filter, a first digital attenuator and a first amplifier, which are connected, and in a downlink, after performing uplink and downlink separation on the signal source signal of each frequency band through the respective corresponding first duplex filter, the signal source signal is subjected to signal attenuation through the first digital attenuator; in the uplink, the uplink signal of each frequency band is filtered and output by the first duplex filter after being amplified by the corresponding first amplifier.
Preferably, the access unit performs data compression on the downlink signal by using a 2:1 compression-scale undistorted compression algorithm.
Preferably, the distribution convergence unit includes a digital board, a second digital optical module and a third digital module, the second digital optical module is connected to the first digital optical module of the access unit, the third digital optical module is connected to the remote coverage unit, and the digital board is configured to distribute downlink digital optical signals of the access unit or converge and combine uplink digital optical signals of the remote coverage unit.
Preferably, the remote coverage unit includes a second digital radio frequency integrated module and a plurality of fourth digital optical modules, the fourth digital optical modules are connected to the third digital modules of the distribution and aggregation unit, and the fourth digital optical modules include a second frequency conversion module, a plurality of second analog/digital conversion modules and a plurality of remote signal processing modules that are connected to each other, an uplink signal of each frequency band corresponds to one remote signal processing module and one second analog/digital conversion module, and the second frequency conversion module is configured to perform up-conversion on a downlink signal in a downlink or perform down-conversion on an uplink signal in an uplink; the second analog/digital conversion module is used for performing digital-to-analog conversion on the information source signal in a downlink to output an audio signal, or performing analog-to-digital conversion on the uplink signal in an uplink to output a digital signal; the far-end signal processing module is used for filtering and outputting signals after power amplification in a downlink or outputting signals after uplink and downlink separation of uplink radio frequency signals in an uplink.
The invention has the beneficial effects that:
1. compared with the traditional access system, the system has the advantages that the cost is reduced in the aspects of property coordination and construction, opening efficiency and maintenance management.
2. The high frequency and the low frequency of the system are configured with different power grade outputs according to the simulation result, so that compatible coverage is achieved, the coverage end directly faces to the user terminal, the traditional simulation passive distribution system is replaced, and the coverage effect is better.
3.5G upgrading and capacity expanding are more convenient, after the 5G license plates are distributed, the software radio technology is utilized, the hardware system is compatible in broadband, software related upgrading and configuration file importing are only needed, and hardware does not need to be changed.
Drawings
FIG. 1 is a schematic diagram of a networking of the system of the present invention;
FIG. 2 is a schematic structural diagram of the system of the present invention;
FIG. 3 is a functional block diagram of an access unit of the present invention;
FIG. 4 is a schematic block diagram of an access unit of the present invention;
FIG. 5 is a functional block diagram of a distribution aggregation unit of the present invention;
FIG. 6 is a functional block diagram of a distribution aggregation unit of the present invention;
FIG. 7 is a functional block diagram of a remote cover unit of the present invention;
fig. 8 is a functional block diagram of a remote coverage unit of the present invention.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
The multi-frequency multi-mode distributed access system disclosed by the invention adopts a set of system to realize the coverage of a plurality of frequency band networks including but not limited to public network signals, private network signals, wired services and the like, and can simultaneously cover the existing networks of all frequency bands such as 2G, 3G, 4G networks and the like.
Referring to fig. 1 and fig. 2, a multi-frequency multi-mode distributed access system disclosed in the embodiment of the present invention includes an Access Unit (AU), a distribution convergence unit (HU), and a remote coverage unit (RU), where all transmissions of the units are connected by optical fibers, and in this embodiment, 10G optical fibers are used for connection. The access unit is connected with the distribution convergence unit and used for accessing information source signals of a plurality of frequency bands (bands) in a downlink, performing digital signal processing on the information source signals, performing data compression on the information source signals and transmitting the information source signals to the distribution convergence unit or the remote coverage unit so as to achieve the purpose of remote transmission and coverage of the information source. Or receiving the multi-band uplink digital optical signals sent by the convergence unit or the remote coverage unit in an uplink, and transmitting the uplink digital optical signals after digital signal processing.
Specifically, the source signal is a Radio Frequency (RF) signal coupled to a base station or other services, including but not limited to public network mobile communication, private network mobile communication, wired service, IoT (Internet of Things) service, and digital television, and covers access to source signals of different standards, different bandwidths, and different services of 300MHz to 3.5 GHz. In this embodiment, source signals of 5 frequency bands may be accessed, the five source signals are defined as BandA, BandB, BandC, BandD, and BandE, and these signals cover the existing source signals in the frequency band ranges of 2G, 3G, and 4G, each source signal may be generally divided into an uplink signal and a downlink signal, for example, the BandA is divided into a BandA source TX and a BandB source RX, and there is also a source signal that needs to separate uplink and downlink signals to form uplink and downlink signals, for example, a TD _ LTE signal.
In this embodiment, as shown in fig. 3, the access unit mainly includes a first digital radio frequency integrated module and a plurality of first digital optical modules, in a downlink, one end (close to a base station or other service end) of the first digital radio frequency integrated module is used to access the plurality of downlink radio frequency signals of the above 5 frequency bands, and the other end (close to the distribution convergence unit end) is connected to the plurality of first digital optical modules. The method is mainly used for sequentially filtering and separating an information source signal in an uplink and a downlink to form a fundamental frequency complex signal with 0MHz as a central frequency, carrying out A/D (analog-to-digital) conversion on the fundamental frequency complex signal after signal attenuation, converting an analog signal into a digital complex signal after ADC (analog-to-digital converter) conversion, then carrying out digital down-conversion (DDC) on the digital complex signal to obtain a baseband signal, carrying out data compression on the baseband signal, carrying out electro-optical conversion on the baseband signal by a first digital optical module, and then sending the baseband signal to the HU or the RU. In the embodiment, the data compression adopts a 2:1 compression scale non-distortion compression algorithm, so that the production cost of the system is reduced and the radio frequency transmission bandwidth is effectively increased under the condition of certain optical fiber capacity. Preferably, the first digital optical module may select a standard SFP + protocol digital optical module, and 4 first digital optical modules are provided in this embodiment.
Referring to fig. 2 and 4, the first digital rf integrated module accesses source signals of multiple frequency bands in downlink, and mainly includes a plurality of near-end signal processing modules, a plurality of first analog-to-digital conversion modules (ADC/DAC) and a first frequency conversion module (DDC/DUC) connected to each other, where the first analog-to-digital conversion module and the first frequency conversion module are connected to each other through a 204B interface, and the first frequency conversion module is connected to the first digital optical module. In this embodiment, the source signal of each frequency band corresponds to a near-end signal processing module and a first analog-to-digital conversion module. Each near-end signal processing module is used for performing signal attenuation and output to the first analog-to-digital conversion module after performing uplink and downlink separation on the corresponding signal source signal in a downlink, or performing filtering output after amplifying the uplink radio frequency signal converted by the first analog-to-digital conversion module in an uplink. The first analog/digital conversion module is used for performing analog-to-digital conversion on the information source signal in a downlink or performing digital-to-analog conversion on the uplink signal in an uplink to output an audio signal; the first frequency conversion module is used for carrying out down-conversion on a source signal in a downlink or carrying out up-conversion on an uplink signal in an uplink.
In this embodiment, as shown in fig. 4, each near-end signal processing module includes a first duplex filter, a first digital attenuator, and a first amplifier, which are connected, and in a downlink, after performing uplink and downlink separation on an information source signal of each frequency band through the respective corresponding first duplex filter, performing signal attenuation through the first digital attenuator, and outputting the signal; in the uplink, the uplink signal of each frequency band is filtered and output by the first duplex filter after being amplified by the corresponding first amplifier.
Of course, when each near-end signal processing module corresponds to source signals of different frequency bands, the structure may be different, for example, the first duplex filter is replaced by a structure combining a filter and a duplexer, or for example, the first digital attenuator may be connected in series with a plurality of, for example, two, first amplifiers may be connected in series with a variable gain amplifier (DVGA), and the like, and these alternative structures are within the protection scope of the present invention.
In this embodiment, according to the heat dissipation assessment, the first digital radio frequency integrated module needs to select 2 12V fans for power supply to dissipate heat; the power supply (namely the power module) of the first digital radio frequency integrated module is realized by adopting a 48-12V brick power supply, and a part of peripheral lightning protection and safety regulation circuits can be added in the power module; the switch with the safety function is arranged on the chassis panel of the access unit and used for controlling the power supply of the whole machine; the battery is that when main electricity (power module) loses power, the battery supplies power for the partial circuit of first digital radio frequency integration module, can also transmit upper computer or OMC (Operation and maintenance center) through battery powered to some warning items. When the main power is operating normally, the battery is in a charged state.
In this embodiment, as shown in fig. 5, the distribution and convergence unit mainly includes a digital board, a second digital optical module and a third digital module, where the second digital optical module is used to connect to the first digital optical module of the access unit, and the third digital optical module is used to connect to the remote coverage unit. The digital board has no radio frequency function, and only distributes the downlink digital optical signals from the access unit or gathers and combines the uplink digital optical signals from the remote coverage unit. The digital board is the distributor/combiner in the schematic block diagram of fig. 2. The number of the second digital optical modules is 4, and the number of the third digital optical modules is 12.
Besides, as shown in fig. 5, the distribution and aggregation unit also includes a power module, a switch with a safety function, and a battery, where the principle of the switch with a safety function and the principle of the battery are similar to those in the access unit, and reference may be made to the above description, and details are not repeated here. Different from the power supply module of the access unit, the power supply module in the distribution aggregation unit comprises a 48-12V power supply or a 220V-12V power supply and a 1000W, 220V-48V power supply, wherein the 48-12V power supply or the 220V-12V power supply mainly provides power supply for the digital board, 1000W, 220V-48V &12V dual-output power supply and 1000W, 220V-48V power supply mainly comprise the digital board of HU and the power supply of RU in a low-power mode are selected for HU _ RPS equipment.
In addition, in this embodiment, the digital board further includes a 12-in-one PSE connected to a 1000W, 220V-48V power supply, and the PSE outputs 12 downlink electrical signals corresponding to 12 third digital optical modules of the digital board one-to-one, and transmits the electrical signals to the RU by using the optical-electrical composite cable. One-to-12 PSE enables the digital board to have the transparent transmission function of 12 paths of gigabit Ethernet, the 12 paths of gigabit Ethernet correspond to 12 optical ports in RU one by one, but the gigabit Ethernet does not have the functions of analyzing and routing.
Preferably, the distribution aggregation units may be cascaded in a plurality as needed, as shown in fig. 1, in this embodiment, the access unit is connected to 3 distribution aggregation units HU1, and each distribution aggregation unit HU1 is further cascaded to 5 distribution aggregation units, that is, cascaded to form 6 distribution aggregation units (HU1 … … HU6), and each distribution aggregation unit is connected to 12 remote coverage units (RU1 … … RU 12). Of course, the number of distribution convergence units accessed by the access unit and the number of distribution convergence unit cascades may be set according to actual requirements, and are not limited to the examples defined herein.
In addition, in other alternative embodiments, under the condition of meeting the user requirements, the multi-frequency multi-mode distributed access system of the present invention may also not include the distribution aggregation unit, that is, the signal does not need to be distributed/aggregated, and the access unit is directly connected to the remote coverage unit.
In this embodiment, as shown in fig. 7, the remote coverage unit mainly includes a second digital radio frequency integrated module and a plurality of fourth digital optical modules, where the fourth digital optical modules are used to be connected to the third digital optical modules of the distribution and aggregation unit or the first digital optical modules of the access unit. In a downlink, the second digital radio frequency integrated module mainly extracts and recovers a clock and processes a digital signal from the access unit AU or the distribution convergence unit HU.
Specifically, as shown in fig. 2 and fig. 8, the second digital-radio frequency integrated module includes a second frequency conversion module (DUC/DDC), a plurality of second analog-to-digital conversion modules (DAC/ADC), and a plurality of remote signal processing modules, which are connected to each other, the second frequency conversion module is connected to the fourth digital optical module, and the uplink signal of each frequency band corresponds to one remote signal processing module and one second analog-to-digital conversion module. The second frequency conversion module is used for performing up-conversion on a downlink signal in a downlink or performing down-conversion on an uplink signal in an uplink. The second analog/digital conversion module is used for performing digital-to-analog conversion on the information source signal in a downlink to output an audio signal, or performing analog-to-digital conversion on the uplink signal in an uplink to output a digital signal. The far-end signal processing module is used for amplifying signals in a downlink, amplifying downlink power and then filtering and outputting the signals, or performing uplink power amplification and signal attenuation and then outputting the signals after performing uplink and downlink separation on uplink radio frequency signals in an uplink.
In this embodiment, each remote signal processing module includes a second amplifier, a downlink power amplifier PA/LPA, an uplink low noise amplifier LNA, a second digital attenuator, and a second duplex filter, which are connected, and in a downlink, a downlink signal of each frequency band is subjected to signal amplification and power amplification sequentially by the second amplifier and the downlink power amplifier PA/LPA corresponding to each frequency band, and then is filtered and output by the second duplex filter; in the uplink, the uplink radio frequency signal of each frequency band is subjected to uplink and downlink signal separation through the second duplex filter, then subjected to power amplification through the corresponding uplink low noise amplifier LNA, subjected to signal attenuation through the second digital attenuator, and output.
Similar to the near-end signal processing module, the far-end signal processing module may also have a different structure when corresponding to source signals of different frequency bands, for example, the second duplex filter is replaced by a structure combining a filter and a duplexer.
In addition, the remote coverage unit includes two modalities, a low power RU and a high power HPRU, and the design structure of the HPRU is described in detail below.
Referring to fig. 7, the downlink power amplifier LPA is monitored in a 232 mode and communicates with the second digital rf integrated module. Considering that each LPA is connected to 232 independently, the remote overlay unit needs to add a 232 interface board, i.e. the remote overlay unit further includes a 232 interface board for connecting the second digital rf integration module and the downstream power amplifiers LPA, in this embodiment, 5 downstream power amplifiers LPA are provided (LPA1 … … LPA5) corresponding to 5 source signals.
In addition, the remote covering unit further comprises a power module, a fan battery board, a battery pack and a fan assembly, wherein the power module comprises a 220V-28V power supply and a 48-12V power supply, the 220V-28V power supply supplies 5 LPAs, the 6 th LPA power supply supplies the fan battery board, and the fan battery board supplies 12V power to the second digital radio frequency integrated module.
Preferably, the HPRU is primarily designed with a box construction. The fan battery board and the second digital radio frequency integrated module are designed in a plug-in box, and the fan battery board comprises the rotating speed management and 24V power supply functions of 7 fans, the power supply conversion function of 28V-12V and the battery charging and discharging management function on the upper layer and the lower layer of the plug-in box. The battery pack selects a 5000mAH high-capacity battery pack, and the power failure alarm of the RU is evaluated in the early stage and needs to be transmitted to the AU through an optical interface serdes of the FPGA (namely, a second digital radio frequency integrated module), so most functions of the FPGA can normally work after power failure, and the high-capacity battery pack is selected. The fan assembly comprises 7 24V fans, has a rotating speed control function and carries out heat dissipation treatment on 5 LPAs.
Furthermore, in addition to the above units, the system of the present invention may further include an auxiliary source access unit (AAU), which is connected to the distribution aggregation unit or the remote coverage unit, and has the same hardware structure as the access unit, and is used for accessing source signals of other frequency bands. As shown in fig. 1, 3 auxiliary source access units are accessed, i.e., 3 source sectors sector2, sector3, and sector4 are added.
In addition, preferably, the characteristics of the digital filter are utilized in the digital signal processing process of the access unit, the auxiliary source access unit or the remote coverage unit, so that the design capability of 20 sub-bands is realized, signals which do not need to be transmitted and amplified are highly suppressed, and the power statistics and balance are performed on the signals of each sub-band. And the transmission mode of the digital signal is carried out based on a Common Public Radio Interface (CPRI) protocol, a non-distortion compression algorithm adopts a 2:1 compression scale, the Radio frequency transmission bandwidth is effectively increased, 5band source access is supported to the maximum extent, and the Radio frequency bandwidth 410M is supported to the maximum extent.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.
Claims (10)
1. A multi-frequency multi-mode distributed access system is characterized in that the system comprises an access unit and a remote covering unit connected with the access unit, wherein,
the access unit is used for accessing information source signals of a plurality of frequency bands in a downlink, sequentially performing signal attenuation, analog-to-digital conversion and down-conversion on the information source signals after performing uplink and downlink filtering separation to obtain downlink digital signals, and transmitting the downlink digital signals to the far-end covering unit through optical fibers after data compression and optical/electrical conversion; the optical transceiver is used for receiving an uplink digital optical signal transmitted by the remote covering unit in an uplink, and sequentially performing optical/electrical conversion, up-conversion, digital-to-analog conversion and signal amplification on the digital optical signal to obtain an uplink radio frequency signal for transmission; the information source signals comprise radio frequency signals of more than 5 frequency bands, and cover the access of the information source signals with the frequency band range of 300 MHz-3.5 GHz;
the remote covering unit is used for processing digital signals of signals from the access unit in a downlink, then outputting the signals after performing power amplification after sequentially performing down-conversion and digital-to-analog conversion to obtain radio-frequency signals, and outputting the signals to the access unit after sequentially performing low-noise amplification, analog-to-digital conversion and up-conversion to obtain digital signals after separating the received uplink signals in an uplink.
2. A multi-frequency multi-mode distributed access system according to claim 1, further comprising a distribution and convergence unit connecting the access unit and the remote coverage unit, for distributing the downlink digital optical signals of the access unit or converging and combining the uplink digital optical signals of the remote coverage unit.
3. The multi-frequency multi-mode distributed access system of claim 2, wherein the access unit is capable of connecting to one or more distribution convergence units, each of the distribution convergence units is capable of connecting to one or more distribution convergence units, and each of the distribution convergence units is connected to a plurality of remote coverage units.
4. A multi-frequency multi-mode distributed access system according to claim 2 or3, further comprising an auxiliary information source access unit having the same hardware structure as the access unit, wherein the auxiliary information source access unit is connected to the distribution aggregation unit or the remote coverage unit.
5. The multi-frequency multi-mode distributed access system of claim 2, the access unit comprises a first digital radio frequency integrated module and a first digital optical module connected with the first digital radio frequency integrated module, the first digital radio frequency integrated module accesses the source signals of a plurality of frequency bands in a downlink, the device comprises a plurality of near-end signal processing modules, a plurality of first analog-to-digital conversion modules and a first frequency conversion module which are connected with each other, wherein the information source signal of each frequency band corresponds to one near-end signal processing module and one first analog-to-digital conversion module, the near-end signal processing module is used for carrying out signal attenuation and outputting to the first analog-to-digital conversion module after carrying out uplink and downlink separation on the information source signal in a downlink, or the uplink radio frequency signal converted by the first analog/digital conversion module is amplified and then filtered and output in the uplink; the first analog/digital conversion module is used for performing analog-to-digital conversion on the information source signal in a downlink or performing digital-to-analog conversion on the uplink signal in an uplink to output an audio signal; the first frequency conversion module is used for carrying out down-conversion on a source signal in a downlink or carrying out up-conversion on an uplink signal in an uplink.
6. The multi-frequency multi-mode distributed access system according to claim 5, wherein the near-end signal processing module includes a first duplex filter, a first digital attenuator, and a first amplifier, which are connected, and in a downlink, after performing uplink and downlink separation on the source signal of each frequency band through the respective corresponding first duplex filter, the source signal is subjected to signal attenuation through the first digital attenuator; in the uplink, the uplink signal of each frequency band is filtered and output by the first duplex filter after being amplified by the corresponding first amplifier.
7. The multi-frequency multi-mode distributed access system according to claim 1, wherein said access unit performs data compression on the downlink signal by using a 2:1 compression-scale non-distortion compression algorithm.
8. The multi-frequency multi-mode distributed access system of claim 5, wherein the distribution aggregation unit comprises a digital board, a second digital optical module and a third digital module, the second digital optical module is connected to the first digital optical module of the access unit, the third digital optical module is connected to the remote coverage unit, and the digital board is configured to distribute downlink digital optical signals of the access unit or aggregate and combine uplink digital optical signals of the remote coverage unit.
9. The multi-frequency multi-mode distributed access system of claim 8, wherein the remote coverage unit comprises a second digital radio frequency integrated module and a plurality of fourth digital optical modules, the fourth digital optical modules are connected to the third digital modules of the distribution aggregation unit, and the fourth digital optical modules are integrated therein and comprise a second frequency conversion module, a plurality of second analog/digital conversion modules and a plurality of remote signal processing modules, which are connected, wherein an uplink signal of each frequency band corresponds to one of the remote signal processing modules and the second analog/digital conversion modules, and the second frequency conversion module is configured to perform up-conversion on a downlink signal in a downlink or perform down-conversion on an uplink signal in an uplink; the second analog/digital conversion module is used for performing digital-to-analog conversion on the information source signal in a downlink to output an audio signal, or performing analog-to-digital conversion on the uplink signal in an uplink to output a digital signal; the far-end signal processing module is used for filtering and outputting signals after power amplification in a downlink or outputting signals after uplink and downlink separation of uplink radio frequency signals in an uplink.
10. The multi-frequency multi-mode distributed access system according to claim 9, wherein the remote signal processing module includes a second amplifier, a downlink power amplifier, an uplink low noise amplifier, a second digital attenuator, and a second duplex filter, which are connected, and in a downlink, downlink signals of each frequency band are filtered and output to the second duplex filter after being sequentially subjected to signal amplification and power amplification by the second amplifier and the downlink power amplifier corresponding thereto; in the uplink, the uplink radio frequency signal of each frequency band is subjected to uplink and downlink signal separation through the second duplex filter, then is subjected to power amplification through the corresponding uplink low noise amplifier, and is subjected to signal attenuation through the second digital attenuator and then is output.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811007556.8A CN110875777B (en) | 2018-08-31 | 2018-08-31 | Multi-frequency multi-system distributed access system |
| SG11202010871YA SG11202010871YA (en) | 2018-08-31 | 2018-09-30 | Multi-frequency Multi-system Distributed Access System |
| PCT/CN2018/108998 WO2018233729A2 (en) | 2018-08-31 | 2018-09-30 | Multi-frequency multi-mode distributed access system |
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| CN201811007556.8A CN110875777B (en) | 2018-08-31 | 2018-08-31 | Multi-frequency multi-system distributed access system |
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| CN109546754A (en) * | 2019-01-23 | 2019-03-29 | 贵州电网有限责任公司 | A kind of region small hydropower station active reactive control system based on Internet of Things |
| CN109982338B (en) * | 2019-03-26 | 2022-08-12 | 广州开信通讯系统有限公司 | Multi-standard digital optical fiber distribution system and method for covering signals of downlink and uplink by using same |
| CN110324064B (en) * | 2019-07-11 | 2024-05-14 | 广东阿尔创通信技术股份有限公司 | Low intermodulation multi-system combiner |
| CN111343642A (en) * | 2020-04-03 | 2020-06-26 | 广州市瀚云信息技术有限公司 | 5G signal radio frequency conversion distribution system |
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| Publication number | Publication date |
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| CN110875777B (en) | 2023-04-25 |
| SG11202010871YA (en) | 2020-11-27 |
| WO2018233729A3 (en) | 2019-06-13 |
| WO2018233729A2 (en) | 2018-12-27 |
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