CN110875777B - Multi-frequency multi-system distributed access system - Google Patents
Multi-frequency multi-system distributed access system Download PDFInfo
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- CN110875777B CN110875777B CN201811007556.8A CN201811007556A CN110875777B CN 110875777 B CN110875777 B CN 110875777B CN 201811007556 A CN201811007556 A CN 201811007556A CN 110875777 B CN110875777 B CN 110875777B
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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
Abstract
The invention discloses a multi-frequency multi-system distributed access system which comprises an access unit, a distribution convergence unit and a remote coverage unit, wherein the access unit can be accessed with more than 5 radio frequency signals of frequency bands, covers the access of information source signals with the frequency band range of 300 MHz-3.5 GHz, processes the information source signals into digital signals, and then transmits the digital signals to the distribution convergence unit or the remote coverage unit through data compression so as to achieve the purpose of remote transmission coverage of the information source. The invention adopts a set of system to solve the problems of public network signals, private network signals and wired service, and the functions which can be completed by the traditional multi-set system, and compared with the traditional access system, the invention has the advantages of reduced cost in the aspects of property coordination and construction, opening efficiency and maintenance management.
Description
Technical Field
The present invention relates to a distributed access system, and in particular, to a multi-frequency multi-system distributed access system.
Background
With the increase of the system of the mobile communication system, the variety and the number of the communication devices are also increased obviously, so that the difficulty of network construction is increased, and the problems of complexity of a network coverage scheme, limitation of machine room space, increased cost of network construction and the like are caused.
Currently, 2G, 3G and 4G networks will coexist for a long period of time, and there will be 5G networks in the future. The operator needs to use a plurality of sets of single-frequency band systems to construct a mobile communication system by using single-system equipment, and the defects of complicated equipment mechanism and configuration, high consumed optical fiber resources, large occupied area, large engineering, messy construction cost of connecting wires and the like are caused for connecting various corresponding systems, so that the mobile communication system is not suitable for large-scale popularization and application.
That is, the following drawbacks are common to either existing single band access systems or multi-band access systems: 1. limited by the frequency selectivity of the front end of the radio frequency, the capacity expansion of the later-stage 5G hardware is inconvenient, and the potential cost is increased. 2. The access unit and the remote coverage unit cannot meet the requirements of mainstream wireless mobile communication and wired transparent transmission under the limitation of transmission bandwidth; 3. the coverage of traffic intensive scenes such as large venues, business circles and the like needs to introduce second, third and even fourth information source sectors, and the traditional solution is to add a set of independent systems for coverage, so that the networking is inflexible and the management is complicated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multi-frequency multi-system distributed access system.
In order to achieve the above purpose, the present invention proposes the following technical scheme: a multi-frequency multi-system 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, carrying out uplink and downlink separation on the information source signals, sequentially carrying out signal attenuation, analog-to-digital conversion and downlink conversion to obtain downlink digital signals, and transmitting the downlink digital signals to the far-end coverage unit through optical fibers after data compression and optical/electrical conversion; the uplink signal receiving unit is used for receiving uplink digital optical signals transmitted by the remote coverage unit in an uplink, and sequentially performing optical/electrical conversion, up-conversion, digital-to-analog conversion and signal amplification on the digital optical signals to output uplink radio frequency signals; the information source signals comprise radio frequency signals of 5 frequency bands, and the access of the information source signals with the frequency band range of 300 MHz-3.5 GHz is covered;
the remote coverage unit is used for carrying out digital signal processing on signals from the access unit in a downlink, then carrying out power amplification on outgoing frequency signals through down conversion and digital-to-analog conversion in sequence, outputting the outgoing frequency signals, separating received uplink signals in an uplink, and then carrying out low-noise amplification, analog-to-digital conversion and up conversion on the outgoing frequency signals in sequence, and outputting the outgoing frequency signals to the access unit.
Preferably, the access unit may be connected to one or more distribution aggregation units, each of the distribution aggregation units may be cascaded to one or more, and each of the distribution aggregation units is connected to a plurality of remote coverage units.
Preferably, the system further comprises an auxiliary information source access unit with the same hardware structure as the access unit, and the auxiliary information source access unit is connected with 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, where the first digital radio frequency integrated module accesses the information source signals of multiple frequency bands in a downlink, and the integrated module includes multiple near-end signal processing modules, multiple first analog/digital conversion modules and a first frequency conversion module that are connected, where the information source signal of each frequency band corresponds to one near-end signal processing module and one first analog/digital conversion module, and the near-end signal processing module is configured to perform uplink and downlink separation on the information source signals and then perform signal attenuation output to the first analog/digital conversion module, or perform amplification and filtering output on uplink radio frequency signals converted by the first analog/digital conversion module in the uplink; the first analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the information source signal in the downlink or carrying out digital-to-analog conversion on the uplink to emit an audio signal; the first frequency conversion module is used for down-converting the information source signal in the downlink or up-converting the uplink signal in the uplink.
Preferably, the near-end signal processing module comprises a first duplex filter, a first digital attenuator and a first amplifier which are connected, in a downlink, the signal source signal of each frequency band is subjected to uplink and downlink separation through the corresponding first duplex filter, and then is subjected to signal attenuation through the first digital attenuator; in the uplink, the uplink signal of each frequency band is output through the filtering of the first duplex filter after being amplified by the corresponding first amplifier.
Preferably, the access unit performs data compression on the downlink signal by adopting a 2:1 compression-scale non-distortion compression algorithm.
Preferably, the distribution convergence unit comprises a digital board, a second digital optical module and a third digital module, wherein the second digital optical module is connected with the first digital optical module of the access unit, the third digital optical module is connected with the far-end coverage unit, and the digital board is used for distributing downlink digital optical signals of the access unit or converging and converging uplink digital optical signals of the far-end coverage unit.
Preferably, the remote coverage unit includes a second digital radio frequency integrated module and a plurality of fourth digital optical modules, where the fourth digital optical modules are connected to the third digital module of the distribution convergence unit, and integrated therein includes a second frequency conversion module, a plurality of second analog/digital conversion modules, and a plurality of remote signal processing modules that are connected, where the uplink signal of each frequency band corresponds to one remote signal processing module and a second analog/digital conversion module, and the second frequency conversion module is configured to up-convert the downlink signal in the downlink or down-convert the uplink signal in the uplink; the second analog/digital conversion module is used for performing digital-to-analog conversion on the information source signal in the downlink and outputting an audio signal, or performing analog-to-digital conversion on the uplink and outputting a digital signal; the remote signal processing module is used for carrying out power amplification on signals in a downlink and then filtering and outputting the signals, or carrying out uplink and downlink separation on uplink radio frequency signals in an uplink and then carrying out signal attenuation and then outputting the signals.
The beneficial effects of the invention are as follows:
1. the system solves the problems of public network signals, private network signals and wired services, and has the functions which can be completed by the traditional multi-set system, and compared with the traditional access system, the system has the advantages of reduced cost in aspects of property coordination and construction, opening efficiency and maintenance management.
2. The high frequency and the low frequency of the system are configured to output different power levels according to the simulation result, so that compatible coverage is realized, the coverage end directly faces to the user terminal, the traditional simulation passive distribution system is replaced, and the coverage effect is better.
3. The 5G upgrading and capacity expansion are more convenient, and after the subsequent 5G license plate is issued, the software radio technology is utilized, the hardware system is compatible in broadband, only the relevant upgrading of the software and the importing of the configuration file are needed, and any change of hardware is not needed.
Drawings
FIG. 1 is a schematic networking diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the principle structure 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 functional 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 coverage 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 solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The multi-frequency multi-system 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 all the existing frequency band networks such as 2G, 3G, 4G networks and the like.
Referring to fig. 1 and fig. 2, the disclosed multi-frequency multi-system distributed access system includes an Access Unit (AU), a distribution convergence unit (HU) and a remote coverage unit (RU), all of the units are transmitted by using optical fiber connection, and in this embodiment, 10G optical fiber connection is adopted. The access unit is connected with the distribution convergence unit and is used for accessing information source signals of a plurality of frequency bands (bands) in a downlink, carrying out digital signal processing on the information source signals, carrying out data compression and then transmitting the information source signals to the distribution convergence unit or the remote coverage unit so as to achieve the purpose of remote transmission 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 the 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 of source signals of different standards, different bandwidths, and different services of 300 MHz-3.5 GHz. In this embodiment, 5 frequency band source signals can be accessed, and these five source signals are defined as BandA, bandB, bandC, bandD and band respectively, which cover the existing 2G, 3G, 4G and other frequency band ranges, where each source can be generally divided into an uplink signal and a downlink signal, for example, band is divided into band source TX and band db source RX, and there is also a source that needs to separate the uplink signal and the downlink signal to form an uplink signal and a downlink signal, for example, a td_lte signal.
In this embodiment, as shown in fig. 3, the access unit mainly includes a first digital rf integrated module and a plurality of first digital optical modules, and in the downlink, one end (near a base station or other service end) of the first digital rf integrated module is used to access a plurality of downlink rf signals of the 5 frequency bands, and the other end (near a distribution convergence unit end) is connected to a plurality of the first digital optical modules. The method is mainly used for sequentially carrying out up-down filtering separation on an information source signal to obtain 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) conversion, 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 HU or RU. In the embodiment, a 2:1 compression scale non-distortion compression algorithm is adopted for data compression, so that the production cost of a system is reduced and the radio frequency transmission bandwidth is effectively increased under the condition of a certain optical fiber capacity. Preferably, the first digital optical modules may be digital optical modules of standard sfp+ protocol, and in this embodiment, 4 first digital optical modules are provided.
Referring to fig. 2 and fig. 4, the first digital radio frequency integrated module accesses the source signals of multiple frequency bands in the downlink, and mainly integrates and includes multiple near-end signal processing modules, multiple first analog-to-digital conversion modules (ADC/DAC) and a first frequency conversion module (DDC/DUC) which are connected, wherein the first analog-to-digital conversion module and the first frequency conversion module are connected through a 204B interface, and the first frequency conversion module is connected with 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 carrying out uplink and downlink separation on the corresponding information source signals and then carrying out signal attenuation and outputting the signal attenuation and downlink separation to the first analog/digital conversion module, or carrying out amplification and filtering output on the uplink radio frequency signals converted by the first analog/digital conversion module in the uplink. The first analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the information source signal in the downlink or carrying out digital-to-analog conversion on the uplink signal to emit an audio signal; the first frequency conversion module is used for down-converting the information source signal in the downlink or up-converting the uplink signal in the 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 that are connected, in the downlink, the signal source signal of each frequency band is output after being separated in the uplink and downlink through the corresponding first duplex filter, and then attenuated through the first digital attenuator; in the uplink, the uplink signal of each frequency band is output through the filtering of 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 can be different, for example, the first duplex filter can be replaced by a structure of combining a filter and a duplexer, for example, the first digital attenuator can be connected in series with a plurality of digital attenuators, for example, two digital attenuators, and the first amplifier can be connected in series with a variable gain amplifier (DVGA), etc., and all the replacing structures are within the protection scope of the present invention.
The access unit comprises a fan, a power module, a switch with a safety function and a battery besides the first digital radio frequency integrated module and the first digital optical module, as shown in fig. 3, in this embodiment, according to the heat dissipation evaluation, the first digital radio frequency integrated module needs to use 2 fans with 12V power supply to dissipate heat; the power supply (namely, a power supply module) of the first digital radio frequency integrated module is realized by adopting a 48-12V brick power supply, and a part of external lightning protection and safety regulation circuits can be added in the power supply module; the switch with the safety function is arranged on a chassis panel of the access unit and is used for controlling the power supply of the whole machine; the battery is used for supplying power to a part of circuits of the first digital radio frequency integrated module when the main power (power supply module) is powered down, and the power supply of the battery can be used for transmitting power to an upper computer or an OMC (Operation and Maintenance Center, operation maintenance center) for some alarm items. When the main power is in normal operation, the battery is in a charged state.
In this embodiment, as shown in fig. 5, the distribution convergence unit mainly includes a digital board, a second digital optical module, and a third digital optical module, where the second digital optical module is used to connect with the first digital optical module of the access unit, and the third digital optical module is used to connect with the remote coverage unit. The digital board has no radio frequency function, and only distributes downlink digital optical signals from the access unit or gathers uplink digital optical signals from the remote coverage unit. The digital board here is the distribution/combiner in the schematic block diagram of fig. 2. And the second digital optical modules are in one-to-one correspondence with the first digital optical modules, 4 digital optical modules are arranged, and 12 digital optical modules are arranged in the third digital optical modules.
In addition, as shown in fig. 5, the distribution convergence 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 battery are similar to those of the above access unit, and reference is made to the above description, and details are not repeated here. Different from the power module of the access unit, the power module in the distribution convergence unit comprises a 48-12V power supply or a 220V-12V power supply and 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 and 12V double-output power supply is selected for HU_RPS equipment, and 1000W,220V-48V power supply mainly is the power supply of the digital board of the HU and the RU in a low power mode.
In addition, in this embodiment, the digital board further includes a 12-way PSE connected to 1000w,220V-48V power supply, where the PSE outputs 12-way downlink electrical signals corresponding to 12-way third digital optical modules of the digital board one by one, and the signals are transmitted to the RU by using the optical composite cable. A12 PSE makes the digital board have the transparent transmission function of 12 paths of gigabit Ethernet, and the 12 paths of gigabit Ethernet are in one-to-one correspondence with 12 optical ports in the RU, but do not have the gigabit Ethernet analysis and routing function.
Preferably, a plurality of distribution aggregation units may be cascaded according to need, as shown in fig. 1, in this embodiment, the access unit connects 3 distribution aggregation units HU1, each distribution aggregation unit HU1 further cascades 5 distribution aggregation units, that is, cascades 6 distribution aggregation units (HU 1 … … HU 6), and each distribution aggregation unit connects 12 remote coverage units (RU 1 … … RU 12). Of course, the number of the distribution aggregation units accessed by the access unit and the number of the cascade connection of the distribution aggregation units can be set according to actual requirements, and are not limited to those defined by examples herein.
In addition, in other alternative embodiments, the multi-frequency multi-system distributed access system of the present invention may also not include the distribution convergence unit herein, that is, the access unit is directly connected to the remote coverage unit without distributing/converging signals, in case of meeting the user requirements.
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 connect with the third digital optical module of the distribution convergence unit or the first digital optical module of the access unit. In the downlink, the second digital radio frequency integration module mainly extracts the recovered clock and digital signal processing of the digital signal from the access unit AU or the distribution aggregation unit HU.
Specifically, as shown in fig. 2 and fig. 8, the second integrated digital radio frequency module includes a second frequency conversion module (DUC/DDC), a plurality of second analog/digital conversion modules (DAC/ADC), and a plurality of remote signal processing modules connected to each other, where the second frequency conversion module is connected to the fourth digital optical module, and the uplink signal of each frequency band corresponds to one of the remote signal processing modules and the second analog/digital conversion modules. The second frequency conversion module is used for up-converting the downlink signal in the downlink or down-converting the uplink signal in the uplink. The second analog/digital conversion module is used for performing digital-to-analog conversion on the source signal in the downlink to obtain an output frequency signal or performing analog-to-digital conversion on the uplink to obtain a digital signal. The remote signal processing module is used for amplifying signals in a downlink and filtering and outputting the signals after the downlink power amplification, or carrying out uplink power amplification and signal attenuation and outputting the signals after the uplink radio frequency signals are separated up and down in an uplink.
In this embodiment, each far-end 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 that are connected, in the downlink, a downlink signal in each frequency band is sequentially amplified by the second amplifier and the downlink power amplifier PA/LPA, and then filtered and output to the second duplex filter; in the uplink, after the uplink radio frequency signals of each frequency band are separated by the second duplex filter, the uplink radio frequency signals are subjected to power amplification by the corresponding uplink low noise amplifier LNA and are subjected to signal attenuation by the second digital attenuator, and then the signals are output.
The same as the above-mentioned near-end signal processing module, the structure of the far-end signal processing module may also be different when it corresponds to the source signals of different frequency bands, for example, the second duplex filter is replaced by a structure that combines a filter and a duplexer.
In addition, the remote overlay unit includes two modes, 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 monitoring mode of the downlink power amplifier LPA adopts a 232 mode to communicate with the second integrated digital radio frequency module. Considering that each LPA is connected independently with 232, a 232 interface board needs to be added to the remote coverage unit, that is, the remote coverage unit further comprises a 232 interface board for connecting the second integrated digital radio frequency module and the downlink power amplifiers LPA, in this embodiment, 5 downlink power amplifiers LPA are set corresponding to 5 source signals (LPA 1 … … LPA 5).
In addition, the remote covering unit further comprises a power module, a fan battery plate, a battery pack and a fan assembly, wherein the power module comprises a 220V-28V power supply and a 48-12V power supply, wherein the 220V-28V power supply is supplied to the 5 LPA, the 6 th path is supplied to the fan battery plate, and the fan battery plate is used for supplying 12V to the second digital radio frequency integrated module.
Preferably, the HPRU is designed primarily as a plug-in box structure. The fan battery board and the second digital radio frequency integrated module are designed in an insertion box, and the fan battery board comprises the functions of rotating speed management of 7 fans, 24V power supply and 28V-12V power supply conversion and also comprises a battery charge and discharge management function on the upper layer and the lower layer of the insertion box. The battery pack selects a high-capacity battery pack with 5000mAH, and the power failure alarm of the RU is required to be transmitted to the AU through an optical port serdes of an FPGA (namely a second digital radio frequency integrated module) according to the early evaluation, so that most functions of the FPGA can normally work after power failure, and the battery pack with the high capacity is selected. The fan assembly comprises 7 24V fans, has a rotating speed control function and performs heat dissipation treatment on 5 LPAs.
Furthermore, in addition to the above units, the system of the present invention may further comprise an auxiliary source access unit (AAU), which is connected to the distribution convergence unit or the remote coverage unit, and has the same hardware structure as the access unit, 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 or the auxiliary source access unit or the remote coverage unit, so that the design capability of 20 subbands is realized, the 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 subband. And the transmission mode of the digital signal is carried out based on CPRI (Common Public Radio Interface ) protocol, the non-distortion compression algorithm adopts a 2:1 compression scale, the radio frequency transmission bandwidth is effectively increased, the 5band source access is supported at maximum, and the radio frequency bandwidth 410M is supported at maximum.
While the foregoing has been disclosed in the specification and drawings, it will be apparent to those skilled in the art that various substitutions and modifications may be made without departing from the spirit of the invention, and it is intended that the scope of the invention be limited not by the specific embodiments disclosed, but by the appended claims.
Claims (10)
1. A multi-frequency multi-system distributed access system is characterized by comprising an access unit, a remote coverage unit and an auxiliary information source access unit which are connected with the access unit,
the access unit is used for accessing information source signals of a plurality of frequency bands in a downlink, carrying out uplink and downlink filtering separation on the information source signals, sequentially carrying out signal attenuation, analog-to-digital conversion and down-conversion to obtain downlink digital signals, and transmitting the downlink digital signals to the far-end coverage unit through optical fibers after data compression and optical/electrical conversion; the uplink signal receiving unit is used for receiving uplink digital optical signals transmitted by the remote coverage unit in an uplink, and sequentially performing optical/electrical conversion, up-conversion, digital-to-analog conversion and signal amplification on the digital optical signals to output uplink radio frequency signals; the information source signals comprise radio frequency signals with more than 5 frequency bands, and the access of the information source signals with the frequency band range of 300 MHz-3.5 GHz is covered;
the remote coverage unit is used for carrying out digital signal processing on signals from the access unit in a downlink, then carrying out power amplification on outgoing frequency signals through up-conversion and digital-to-analog conversion in sequence, outputting the outgoing frequency signals, separating the received uplink signals in the uplink, and then carrying out low-noise amplification, analog-to-digital conversion and down-conversion on the outgoing frequency signals in sequence, and outputting the outgoing frequency signals to the access unit;
the auxiliary source access unit is used for adding source sectors and the frequency bands of the source signals corresponding to the source sectors are different.
2. The multi-frequency, multi-system, distributed access system of claim 1, further comprising a distribution convergence unit coupled to the access unit and the remote coverage unit, for distributing downstream digital optical signals of the access unit or converging upstream digital optical signals of the remote coverage unit.
3. The multi-frequency multi-system distributed access system according to claim 2, wherein the access units are connected to one or more distribution aggregation units, each of the distribution aggregation units is cascaded to one or more, and each of the distribution aggregation units is connected to a plurality of remote coverage units.
4. The multi-frequency multi-system distributed access system according to claim 2, wherein the hardware structure of the auxiliary source access unit is the same as the structure of the access unit, and the auxiliary source access unit is connected to the distribution convergence unit or the remote coverage unit.
5. The multi-frequency multi-system distributed access system according to claim 2, wherein 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 is connected with the source signals of a plurality of frequency bands in a downlink, the integrated module comprises a plurality of connected near-end signal processing modules, a plurality of first analog/digital conversion modules and a first frequency conversion module, the source signals of each frequency band correspond to one near-end signal processing module and one first analog/digital conversion module, and the near-end signal processing module is used for carrying out uplink and downlink separation on the source signals and then carrying out signal attenuation output to the first analog/digital conversion module, or carrying out amplification and filtering output on the uplink radio frequency signals converted by the first analog/digital conversion module in an uplink; the first analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the information source signal in the downlink or carrying out digital-to-analog conversion on the uplink to emit an audio signal; the first frequency conversion module is used for down-converting the information source signal in the downlink or up-converting the uplink signal in the uplink.
6. The multi-frequency multi-system distributed access system according to claim 5, wherein the near-end signal processing module comprises a first duplex filter, a first digital attenuator and a first amplifier which are connected, and in the downlink, the signal source signal of each frequency band is subjected to uplink and downlink separation through the corresponding first duplex filter and then subjected to signal attenuation through the first digital attenuator; in the uplink, the uplink signal of each frequency band is output through the filtering of the first duplex filter after being amplified by the corresponding first amplifier.
7. The multi-frequency multi-system distributed access system according to claim 1, wherein the access unit performs data compression on the downlink signal by using a 2:1 compression-scale non-distortion compression algorithm.
8. The multi-frequency and multi-system distributed access system according to claim 5, wherein the distribution convergence unit comprises a digital board, a second digital optical module and a third digital optical module, the second digital optical module is connected with the first digital optical module of the access unit, the third digital optical module is connected with the far-end coverage unit, and the digital board is used for distributing the downlink digital optical signals of the access unit or converging and converging the uplink digital optical signals of the far-end coverage unit.
9. The multi-frequency multi-mode distributed access system according to 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 with a third digital optical module of the distribution convergence unit, and the integrated unit comprises a second frequency conversion module, a plurality of second analog/digital conversion modules and a plurality of remote signal processing modules which are connected, and the 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 used for up-converting downlink signals in downlink or down-converting uplink signals in uplink; the second analog/digital conversion module is used for performing digital-to-analog conversion on the information source signal in the downlink and outputting an audio signal, or performing analog-to-digital conversion on the uplink and outputting a digital signal; the remote signal processing module is used for carrying out power amplification on signals in a downlink and then filtering and outputting the signals, or carrying out uplink and downlink separation on uplink radio frequency signals in an uplink and then carrying out signal attenuation and then outputting the signals.
10. The multi-frequency multi-system distributed access system according to claim 9, wherein the remote signal processing module comprises a second amplifier, a downlink power amplifier, an uplink low noise amplifier, a second digital attenuator and a second duplex filter which are connected, in the downlink, the downlink signal of each frequency band is sequentially subjected to signal amplification and power amplification by the respective second amplifier and downlink power amplifier and then is filtered and output to the second duplex filter; in the uplink, after uplink and downlink signals of each frequency band are separated by the second duplex filter, the uplink signals are subjected to power amplification by the corresponding uplink low-noise amplifier and signal attenuation by the second digital attenuator, and then the signals are 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 |
| PCT/CN2018/108998 WO2018233729A2 (en) | 2018-08-31 | 2018-09-30 | Multi-frequency multi-mode distributed access system |
| SG11202010871YA SG11202010871YA (en) | 2018-08-31 | 2018-09-30 | 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103379674A (en) * | 2013-07-24 | 2013-10-30 | 三维通信股份有限公司 | Multimode digital DAS supporting multi-information-source access |
| CN105406925A (en) * | 2015-09-25 | 2016-03-16 | 广州埃信电信设备有限公司 | Multi-band frequency digital fiber distributed antenna system |
| CN105813100A (en) * | 2014-12-27 | 2016-07-27 | 华为技术有限公司 | Frequency shift combiner and splitter module, same frequency splitting capacity expansion method, and operator resource sharing method |
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| US6334219B1 (en) * | 1994-09-26 | 2001-12-25 | Adc Telecommunications Inc. | Channel selection for a hybrid fiber coax network |
| US8346091B2 (en) * | 2009-04-29 | 2013-01-01 | Andrew Llc | Distributed antenna system for wireless network systems |
| CN102263595B (en) * | 2011-08-29 | 2016-04-20 | 罗森伯格（上海）通信技术有限公司 | Many nets merge Fiber Access System |
| CN102571212B (en) * | 2012-02-08 | 2015-10-14 | 深圳国人通信股份有限公司 | Indoor optical fiber distribution system |
| CN106571931B (en) * | 2015-10-12 | 2020-12-04 | 中兴通讯股份有限公司 | Indoor distribution system and working method thereof |
| CN107295532B (en) * | 2017-08-16 | 2020-06-23 | 京信通信系统（中国）有限公司 | Optical fiber distribution system and communication method |
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| CN103379674A (en) * | 2013-07-24 | 2013-10-30 | 三维通信股份有限公司 | Multimode digital DAS supporting multi-information-source access |
| CN105813100A (en) * | 2014-12-27 | 2016-07-27 | 华为技术有限公司 | Frequency shift combiner and splitter module, same frequency splitting capacity expansion method, and operator resource sharing method |
| CN105406925A (en) * | 2015-09-25 | 2016-03-16 | 广州埃信电信设备有限公司 | Multi-band frequency digital fiber distributed antenna system |
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| CN110875777A (en) | 2020-03-10 |
| WO2018233729A2 (en) | 2018-12-27 |
| WO2018233729A3 (en) | 2019-06-13 |
| SG11202010871YA (en) | 2020-11-27 |
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