WO2018233729A2

WO2018233729A2 - Multi-frequency multi-mode distributed access system

Info

Publication number: WO2018233729A2
Application number: PCT/CN2018/108998
Authority: WO
Inventors: 闵海军
Original assignee: 罗森伯格（上海）通信技术有限公司
Priority date: 2018-08-31
Filing date: 2018-09-30
Publication date: 2018-12-27
Also published as: CN110875777B; CN110875777A; SG11202010871YA; WO2018233729A3

Abstract

Disclosed is a multi-frequency multi-mode distributed access system, comprising an access unit, distribution convergence units and remote coverage units. The access unit is capable of accessing radio frequency signals of more than five frequency bands, covering access to source signals in the frequency band range of 300MHz to 3.5GHz, performing digital signal processing on the source signals, and then performing data compression and transmission to the distribution convergence units or the remote coverage units, so as to achieve the goal of source remote transmission coverage. The one system is used to solve public network signals, special network signals and wired services, as well as functions which traditionally only multiple systems could complete. Compared to traditional access systems, costs related to property coordination and construction, provisioning and maintenance management are all reduced.

Description

Multi-frequency multi-system distributed access system

Technical field

The invention relates to a distributed access system, in particular to a multi-frequency multi-system distributed access system.

Background technique

With the increase of the standard of mobile communication systems, the types and number of communication devices have also increased significantly, which has increased the difficulty of network construction, the complexity of network coverage schemes, the limited space of computer room space, and the increased cost of network construction. Come.

Currently, 2G, 3G and 4G networks will coexist for a long time, and there will be 5G networks in the future. With a single system, operators need to use multiple sets of single-band systems to build a mobile communication system. In order to connect various systems, it will cause the interconnection of equipment and configuration between systems, and the use of fiber resources will be large. The large-scale project, the high cost of connection and messy, is not suitable for large-scale promotion and application.

That is to say, the existing single-band access system or multi-band access system generally has the following disadvantages: 1. Due to the frequency selectivity of the RF front-end, the 5G hardware upgrade and expansion is inconvenient, and the potential cost is increased. 2. Due to the limitation of transmission bandwidth, the access unit and the remote coverage unit cannot meet the mainstream wireless mobile communication and wired transparent transmission; 3. The coverage of traffic-intensive scenes such as large venues and business districts needs to be introduced into the second and third. Even the fourth source sector, the traditional solution is to add a separate system to cover, the networking is not flexible, and the management is complicated.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a multi-frequency multi-system distributed access system.

In order to achieve the above object, the present invention provides the following technical solution: a multi-frequency multi-standard distributed access system, including an access unit and a remote coverage unit connected to the access unit, where

The access unit is configured to access a source signal of multiple frequency bands in the downlink, perform signal attenuation, analog-to-digital conversion, and down-conversion of the downlink digital signal after performing uplink and downlink separation on the source signal. Passing the downlink digital signal to the remote coverage unit via data compression, optical/electrical conversion, and receiving the uplink digital optical signal transmitted by the remote coverage unit in the uplink, for the digital light The signal is sequentially subjected to optical/electrical conversion, up-conversion, digital-to-analog conversion, and signal amplification to transmit an uplink radio frequency signal; the source signal includes radio frequency signals of five frequency bands, and covers a source signal with a frequency range of 300 MHz to 3.5 GHz. Access

The remote coverage unit is configured to perform digital signal processing on the signal from the access unit in the downlink, and then sequentially convert the RF signal by down-conversion and digital-analog, and then perform power amplification and output, in the uplink. After the received uplink signals are separated, the digital signals are sequentially subjected to low-noise amplification, analog-to-digital conversion, and up-conversion, and then output 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 one or more, and each of the distribution aggregation units is connected to multiple remote coverage units.

Preferably, the system further comprises an auxiliary source access unit having the same hardware structure and access unit structure, and the auxiliary source access unit is connected to the distribution aggregation unit or the remote coverage unit.

Preferably, the access unit comprises a first digital radio integrated module and a first digital optical module connected to the first digital radio integrated module, where the first digital radio integrated module accesses multiple times in the downlink. The source signal of the frequency band includes a plurality of connected near-end signal processing modules, a plurality of first analog/digital conversion modules and a first frequency conversion module, and the source signal of each frequency band corresponds to a near The end signal processing module and a first analog/digital conversion module, wherein the near-end signal processing module is configured to perform signal attenuation output to the first analog/digital conversion module after uplink and downlink separation of the source signal in the downlink, Or performing an amplification and filtering output on the uplink RF signal converted by the first analog/digital conversion module in the uplink; the first analog/digital conversion module is configured to perform analog modulus on the downlink signal in the downlink. Converting, or digitally converting the uplink signal out of the RF signal in the uplink; the first frequency conversion module is configured to downconvert the source signal in the downlink or uplink signal in the uplink Line upconversion.

Preferably, the near-end signal processing module comprises a connected first duplex filter, a first digital attenuator and a first amplifier, and in the downlink, the source signals of each frequency band are respectively corresponding to the first pair After the filter is separated by the uplink and downlink, the signal is attenuated by the first digital attenuator; in the uplink, the uplink signals of each frequency band are amplified by the corresponding first amplifiers, and then subjected to the first duplex filtering. Filter output.

Preferably, the access unit performs data compression on the downlink signal by using a 2:1 compression scale non-distortion compression algorithm.

Preferably, 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, and the third digital optical module is The remote coverage unit is connected, and the digital board is configured to distribute the downlink digital optical signal of the access unit or to aggregate the uplink digital optical signal of the remote coverage unit.

Preferably, the remote coverage unit comprises a second digital radio frequency integration module and a plurality of fourth digital optical modules, wherein the fourth digital optical module is connected to the third digital module of the distribution aggregation unit, and the integration includes the phase a second frequency conversion module, a plurality of second analog/digital conversion modules and a plurality of remote signal processing modules, wherein the uplink signal of each frequency band corresponds to a remote signal processing module and a second analog/digital conversion module, The second frequency conversion module is configured to upconvert the downlink signal in the downlink or downconvert the uplink signal in the uplink; the second analog/digital conversion module is configured to source the source in the downlink The signal is digital-to-analog converted to a radio frequency signal, or the uplink signal is analog-to-digital converted in the uplink; the remote signal processing module is configured to perform power amplification on the downlink to filter the output, or In the uplink, after the uplink and downlink signals are separated by the uplink and downlink signals, the signals are attenuated and output.

The beneficial effects of the invention are:

1. Using a system to solve public network signals, private network signals and cable services, and functions that can be completed by traditional multiple systems. Compared with traditional access systems, the cost of property coordination and construction, opening efficiency, maintenance management are all Reduced.

2. The high and low frequencies of the system are configured according to the simulation results to output different power levels, so that the coverage is compatible, and the coverage end directly faces the user terminal, instead of the traditional analog passive distribution system, the coverage effect is better.

3, 5G upgrade and expansion is more convenient, after the release of the 5G license, using software radio technology, hardware system broadband compatibility, only need to carry out software-related upgrades and configuration file import, no need to make any changes to the hardware.

DRAWINGS

1 is a schematic diagram of networking of the system of the present invention;

2 is a schematic structural diagram of a system of the present invention;

Figure 3 is a functional block diagram of an access unit of the present invention;

4 is a schematic block diagram of an access unit of the present invention;

Figure 5 is a functional block diagram of a distribution aggregation unit of the present invention;

Figure 6 is a schematic block diagram of a distribution aggregation unit of the present invention;

Figure 7 is a functional block diagram of a remote coverage unit of the present invention;

Figure 8 is a schematic block diagram of the remote coverage unit of the present invention.

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

The multi-frequency multi-system distributed access system disclosed by the invention adopts a system to realize coverage of multiple frequency bands including but not limited to public network signals, private network signals and wired services, and can cover 2G at the same time. A network of all existing frequency bands such as 3G and 4G networks.

As shown in FIG. 1 and FIG. 2, a multi-frequency multi-standard distributed access system disclosed in the embodiments of the present invention includes an access unit (AU), a distribution aggregation unit (HU), and a remote coverage unit (RU). The transmission of each unit is all connected by an optical fiber. In this embodiment, a 10G optical fiber connection is used. The access unit is connected to the distribution and aggregation unit, and is configured to access a plurality of source signals of the band in the downlink, perform digital signal processing on the source signals, and perform data compression and transmission to the distribution and aggregation unit. Or the remote coverage unit, in order to serve as a source for remote transmission coverage. Or receiving uplink multi-band digital optical signals sent by the aggregation unit or the remote coverage unit in the uplink, and performing digital signal processing on the uplink digital optical signals for transmission.

Specifically, the source signal here 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, Internet of Things) service, Digital TV covers the access of source signals of different formats, different bandwidths and different services from 300MHz to 3.5GHz. In this embodiment, the source signals of the five frequency bands can be accessed, and the five source signals are defined as BandA, BandB, BandC, BandD, and BandE, and the signals cover the existing frequency ranges of 2G, 3G, and 4G. Source, each source can be generally divided into uplink signal and downlink signal. For example, BandA is divided into BandA source TX and BandB source RX. There is also a source that needs to form uplink and downlink signals after the uplink and downlink signals are separated, such as TD_LTE signal. .

In this embodiment, as shown in FIG. 3, the access unit mainly includes a first digital radio frequency integration module and a plurality of first digital optical modules. In the downlink, one end of the first digital radio frequency integration module (near the base station) Or one of the other services is used to access multiple downlink radio signals of the above five frequency bands, and the other end (close to one end of the distribution aggregation unit) is connected to the plurality of first digital optical modules. The utility model is mainly used for sequentially transforming the source signal into a fundamental frequency complex signal with a center frequency of 0 MHz, and attenuating the fundamental frequency complex signal to perform A/D analog-to-digital conversion, and then performing ADC conversion simulation. The signal becomes a digital complex signal, and then the digital complex signal is digitally down-converted (DDC) to obtain a baseband signal, and the baseband signal is compressed by data, then subjected to electro-optical conversion by the first digital optical module, and then sent to the HU or RU. . In this embodiment, the data compression uses a 2:1 compression scale non-distortion compression algorithm to reduce the production cost of the system and increase the RF transmission bandwidth when the fiber capacity is constant. Preferably, the first digital optical module can use a standard SFP+ protocol digital optical module, and in this embodiment, four first digital optical modules are disposed.

As shown in FIG. 2 and FIG. 4, the first digital radio-frequency integration module accesses source signals of multiple frequency bands in the downlink, and the main integration includes a plurality of near-end signal processing modules connected to each other, and multiple An analog/digital conversion module (ADC/DAC) and a first frequency conversion module (DDC/DUC), the first analog/digital conversion module and the first frequency conversion module are connected through a 204B interface, and the first frequency conversion module and the first number The optical modules are connected. 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 of the near-end signal processing modules is configured to perform uplink and downlink separation of respective corresponding source signals in the downlink, and then perform signal attenuation output to the first analog/digital conversion module, or in the uplink. The upstream RF signal converted by an analog/digital conversion module is amplified and filtered. The first analog/digital conversion module is configured to perform analog-to-digital conversion on the source signal in the downlink, or digital-to-analog-convert the uplink signal in the uplink; the first frequency conversion module is used in the downlink The source signal is downconverted in the link or upconverted in the uplink.

In this embodiment, as shown in FIG. 4, each near-end signal processing module includes a connected first duplex filter, a first digital attenuator, and a first amplifier, and a source of each frequency band in the downlink. After the signal is separated by the corresponding first duplex filter, the signal is attenuated and outputted by the first digital attenuator; in the uplink, the uplink signal of each frequency band is performed by the corresponding first amplifier. After the signal is amplified, the output is filtered by the first duplex filter.

Of course, each near-end signal processing module may have a different structure when it corresponds to a source signal of a different frequency band. For example, the first duplex filter is replaced by a structure combining a filter and a duplexer, and the first is as described above. The digital attenuator can be connected in series, such as two, the first amplifier can be connected in series with a variable gain amplifier (DVGA), etc., and these alternative configurations are within the scope of the present invention.

The access unit includes the first digital radio frequency integration module and the first digital optical module, as shown in FIG. 3, and further includes a fan, a power module, a switch with a safety function, and a battery. In this embodiment, the heat dissipation evaluation is performed. The first digital RF integrated module needs to use two 12V power supply fans to dissipate heat; the power supply of the first digital RF integrated module (ie, the power module) is implemented by a 48-12V brick power supply, and can be in the power supply. Some peripheral lightning protection and safety circuit are added to the module; the switch with insurance function is set on the chassis panel of the access unit to control the power of the whole machine; the battery is turned when the main power (power module) is powered down. The battery is used to supply power to some circuits of the first digital RF integrated module. For some alarm items, it can also be transmitted to the host computer or the OMC (Operation and Maintenance Center) through battery power. When the main power is working normally, the battery is in a charging state.

In this embodiment, as shown in FIG. 5, the distribution aggregation unit mainly includes a digital board, a second digital optical module, and a third digital module, wherein the second digital optical module is used to connect to the first digital optical module of the access unit. The third digital optical module is used to connect to the remote coverage unit. The digital board here has no radio frequency function, and only distributes downlink digital optical signals from the access unit, or uplink digital optical signals from the remote coverage unit to perform aggregation. The digital board here is the distribution/combiner in the block diagram of Figure 2. And the second digital optical module is in one-to-one correspondence with the first digital optical module, and four are arranged, and the third digital optical module is set to twelve.

In addition, as shown in FIG. 5, the distribution and aggregation unit also includes a power module, a switch with a safety function, and a battery. The principle of the switch and the battery with the safety function is similar to that of the above access unit, and can be referred to The above description is not repeated here. Different from the power module of the access unit, the power module in the distribution aggregation unit includes 48-12V power supply or 220V-12V power supply, and 1000W, 220V-48V power supply, wherein 48-12V power supply or 220V-12V power supply is mainly given The digital board provides power supply. For HU_RPS equipment, 1000W, 220V-48V & 12V dual output power supply is selected, and 1000W, 220V-48V power supply is mainly for HU digital board and low power form RU power supply.

In addition, in this embodiment, the digital board further includes a 12PSE connected to the 1000W, 220V-48V power supply, and the 12-channel downlink electrical signals of the PSE output are respectively corresponding to the 12-channel third digital optical modules of the digital board, and the photoelectric is used. The composite cable is transmitted to the RU. One-point 12PSE enables the digital board to have 12-way Gigabit Ethernet transparent transmission function, and 12-way Gigabit Ethernet has one-to-one correspondence with 12 optical ports in the RU, but does not have Gigabit Ethernet resolution and routing functions.

Preferably, the distribution aggregation unit can be cascaded as needed, as shown in FIG. 1. In this embodiment, the access unit is connected to three distribution aggregation units HU1, and each distribution aggregation unit HU1 is further cascaded with five distribution aggregation units. That is, cascading forms six distribution aggregation units (HU1 ... HU6), and each distribution aggregation unit is connected to 12 remote coverage units (RU1 ... RU12). Of course, the number of distribution aggregation units accessed by the access unit and the number of distribution aggregation unit cascades may be set according to actual requirements, and are not limited to the examples herein.

In addition, in other alternative embodiments, the multi-frequency multi-standard distributed access system of the present invention may not include the distribution aggregation unit herein, that is, the signal distribution/aggregation is not required, and the access unit is not satisfied. 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 integration module and a plurality of fourth digital optical modules, wherein the fourth digital optical module is used for distributing the third digit of the convergence unit. The first digital optical module of the optical module or the access unit is connected. In the downlink, the second digital radio-integration module mainly extracts and recovers clock and digital signal processing from the digital signals from the access unit AU or the distribution aggregation unit HU.

Specifically, as shown in FIG. 2 and FIG. 8 , the second digital RF integrated module includes a second variable frequency conversion module (DUC/DDC) and a plurality of second analog/digital conversion modules (DAC/ADC). And a plurality of remote signal processing modules, the second frequency conversion module is connected to the fourth digital light module, and the uplink signal of each frequency band corresponds to one remote signal processing module and the second analog/digital conversion module. The second frequency conversion module is configured to upconvert the downlink signal in the downlink or downconvert the uplink signal in the uplink. The second analog/digital conversion module is configured to digitally convert the source signal into a radio frequency signal in the downlink, or perform analog to digital conversion on the uplink signal in the uplink. The remote signal processing module is configured to amplify the signal in the downlink and filter the output after the downlink power is amplified, or perform uplink power amplification and signal attenuation after the uplink and downlink signals are separated in the uplink.

In this embodiment, each remote signal processing module includes a connected second amplifier, a downlink power amplifier PA/LPA, an uplink low noise amplifier LNA, a second digital attenuator, and a second duplex filter, in the downlink. The downlink signals of each frequency band are sequentially subjected to signal amplification and power amplification by respective corresponding second amplifiers and downlink power amplifiers PA/LPA, and then filtered and outputted to the second duplex filter; in the uplink, each frequency band is uplinked. After the RF signal is separated by the second duplex filter, the power is amplified by the corresponding uplink low noise amplifier LNA, and the signal is attenuated by the second digital attenuator.

Similar to the above-mentioned near-end signal processing module, the structure of the far-end signal processing module corresponding to different frequency bands may also be different, for example, the second duplex filter also adopts filter and duplex. Replace the structure of the device.

In addition, the remote coverage unit includes two forms, a low power RU and a high power HPRU. The design structure of the HPRU is described in detail below.

As shown in FIG. 7, the monitoring mode of the downlink power amplifier LPA adopts the 232 mode to communicate with the second digital radio frequency integrated module. Considering each LPA independent 232 connection, the remote coverage unit needs to add a 232 interface board, that is, the remote coverage unit further includes a 232 interface board for connecting the second digital RF integrated module and the downlink power amplifier LPA. In this embodiment, five downlink signal amplifiers (LPA1, ... LPA5) are provided for the five source signals.

In addition, the remote coverage unit further includes a power module, a fan battery board, a battery pack, and a fan assembly. The power module includes a 220V-28V power supply and a 48-12V power supply, wherein the 220V-28V power supply provides 5 LPAs. The sixth way is provided to the fan battery board, and the fan battery board is turned to supply 12v to the second digital radio frequency integrated module.

Preferably, the HPRU is primarily designed with a box structure. The fan battery board and the second digital RF integrated module are designed in a single box. In the upper and lower layers of the plug box, the fan battery board includes 7 fan speed management and 24V power supply and 28V-12V power conversion function, including battery Charge and discharge management functions. The battery pack uses a 5000mAH large-capacity battery pack. According to the pre-assessment RU, the power-down alarm needs to be transmitted to the AU through the optical port serdes of the FPGA (the second digital RF integrated module), so most functions of the FPGA must be after the power failure. Normal operation, so choose a large capacity battery pack. The fan assembly consists of seven 24V fans with speed control for heat dissipation of five LPAs.

Further, in addition to the above units, the system of the present invention may further include an auxiliary source access unit (AAU) connected to the distribution aggregation unit or the remote coverage unit, and having the same hardware structure as the access unit. Source signal for accessing other frequency bands. As shown in Figure 1, three auxiliary source access units are connected, that is, three source sectors sector2, sector3, and sector4 are added.

In addition, preferably, the digital sub-band is utilized in the digital signal processing process of the access unit or the auxiliary source access unit or the remote coverage unit to realize the design capability of the 20 sub-bands, and the signal that does not need to be transmitted and amplified. High suppression is performed, and power statistics and balance are performed on the signals of each sub-band. The transmission mode of the digital signal is based on the CPRI (Common Public Radio Interface) protocol. The non-distortion compression algorithm uses a 2:1 compression scale to effectively increase the RF transmission bandwidth, and supports up to 5 band source access. Bandwidth 410M.

The technical content and the technical features of the present invention have been disclosed as above, but those skilled in the art can still make various alternatives and modifications without departing from the spirit and scope of the present invention based on the teachings and disclosures of the present invention. Therefore, the scope of protection of the present invention should not be limited to The disclosure of the embodiments is intended to cover various alternatives and modifications of the inventions

Claims

A multi-frequency multi-system distributed access system, comprising: an access unit and a remote coverage unit connected to the access unit, wherein

The access unit is configured to access a source signal of multiple frequency bands in the downlink, perform uplink and downlink filtering separation on the source signal, and then perform signal attenuation, analog-to-digital conversion, and down-conversion of the downlink digital signal. Transmitting the downlink digital signal to the remote coverage unit via data compression, optical/electrical conversion, and receiving the uplink digital optical signal transmitted by the remote coverage unit in the uplink, for the digital The optical signal sequentially performs optical/electrical conversion, up-conversion, digital-to-analog conversion, and signal amplification to transmit an uplink radio frequency signal; the source signal includes radio frequency signals of more than 5 frequency bands, and covers a signal range of 300 MHz to 3.5 GHz. Access to the source signal;

The remote coverage unit is configured to perform digital signal processing on the signal from the access unit in the downlink, and then sequentially convert the RF signal by down-conversion and digital-analog, and then perform power amplification and output, in the uplink. After the received uplink signals are separated, the digital signals are sequentially subjected to low-noise amplification, analog-to-digital conversion, and up-conversion, and then output to the access unit.
The multi-frequency multi-system distributed access system according to claim 1, wherein the system further comprises a distribution aggregation unit connecting the access unit and the remote coverage unit, configured to downlink the digital light of the access unit. The signal is distributed, or the upstream digital optical signal of the remote coverage unit is aggregated.
The multi-frequency multi-standard distributed access system according to claim 2, wherein the access unit can be connected to one or more distribution aggregation units, and each of the distribution aggregation units can be cascaded with one or more And each of the distribution aggregation units is connected to a plurality of remote coverage units.
The multi-frequency multi-system distributed access system according to claim 2 or 3, wherein the system further comprises an auxiliary source access unit having the same hardware structure and access unit structure, and the auxiliary source is connected. The incoming unit is connected to the distribution aggregation unit or the remote coverage unit.
The multi-frequency multi-system distributed access system according to claim 2, wherein the access unit comprises a first digital radio frequency integration module and a first digital optical module connected to the first digital radio frequency integration module The first digital radio frequency integration module accesses the source signals of the plurality of frequency bands in the downlink, and the integrated includes a plurality of connected near-end signal processing modules and a plurality of first analog/digital conversions a module and a first frequency conversion module, wherein the source signal of each frequency band corresponds to a near-end signal processing module and a first analog/digital conversion module, and the near-end signal processing module is configured to use the source signal in the downlink Performing signal attenuation output to the first analog/digital conversion module after uplink and downlink separation, or amplifying and filtering the uplink RF signal converted by the first analog/digital conversion module in the uplink; the first mode The /digital conversion module is configured to perform analog-to-digital conversion on the source signal in the downlink or digital-to-analog-convert the uplink signal in the uplink; the first frequency conversion module is used in the downlink The down signal is down-converted or up-converted in the uplink.
The multi-frequency multi-system distributed access system according to claim 5, wherein the near-end signal processing module comprises a connected first duplex filter, a first digital attenuator and a first amplifier, and is downlinked In the link, the source signals of each frequency band are separated by the corresponding first duplex filter, and then the signal is attenuated by the first digital attenuator; in the uplink, the uplink signal of each frequency band After the signals are amplified by the corresponding first amplifiers, the signals are filtered by the first duplex filter.
The multi-frequency multi-standard 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.
The multi-frequency multi-system distributed access system according to claim 5, wherein the distribution aggregation unit comprises a digital board, a second digital optical module and a third digital module, and the second digital optical module is connected The first digital optical module is connected to the unit, and the third digital optical module is connected to the remote coverage unit, where the digital board is used to distribute the downlink digital optical signal of the access unit, or the uplink coverage unit is uplinked. The digital optical signal is aggregated.
The multi-frequency multi-standard distributed access system according to claim 8, wherein the remote coverage unit comprises a second digital radio integrated module and a plurality of fourth digital optical modules, the fourth digital light The module is connected to the third digital module of the distribution aggregation unit, and includes a second frequency conversion module, a plurality of second analog/digital conversion modules and a plurality of remote signal processing modules, and an uplink signal of each frequency band. Corresponding to a remote signal processing module and a second analog/digital conversion module, the second frequency conversion module is configured to upconvert the downlink signal in the downlink or downconvert the uplink signal in the uplink; The second analog/digital conversion module is configured to digitally convert the source signal into a radio frequency signal in the downlink, or perform analog to digital conversion on the uplink signal in the uplink; the remote signal processing The module is configured to filter the output after power amplification of the signal in the downlink, or perform signal attenuation after uplink and downlink separation of the uplink RF signal in the uplink.
The multi-frequency multi-standard distributed access system according to claim 9, wherein the remote signal processing module comprises a connected second amplifier, a downlink power amplifier, an uplink low noise amplifier, a second digital attenuator, and a second duplex filter, in the downlink, the downlink signals of each frequency band are sequentially subjected to signal amplification and power amplification by respective second amplifiers and downlink power amplifiers, and then filtered and outputted to the second duplex filter; In the link, the uplink RF signal of each frequency band is separated by the second duplex filter, and then the power is amplified by the corresponding uplink low noise amplifier, and the signal is attenuated by the second digital attenuator.