CN113132118B - Wireless communication system based on Ethernet full digital signal transmission - Google Patents
Wireless communication system based on Ethernet full digital signal transmission Download PDFInfo
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- CN113132118B CN113132118B CN201911396362.6A CN201911396362A CN113132118B CN 113132118 B CN113132118 B CN 113132118B CN 201911396362 A CN201911396362 A CN 201911396362A CN 113132118 B CN113132118 B CN 113132118B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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Abstract
The invention discloses a wireless communication system based on Ethernet full digital signal transmission, belonging to the technical field of optical fiber communication. The expansion distribution and combination subsystem and the signal receiving and transmitting subsystem are connected through the Ethernet, so that the signal transmission loss is small, and the technology is mature and reliable; the power supply module of the expansion distribution and combination subsystem supplies power to the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem, and the power supply circuit is simple and convenient for later-period system maintenance.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a wireless communication system based on Ethernet full digital signal transmission.
Background
In the later 4G era, the construction of 4G macro stations of operators is basically completed, coverage gradually develops from outdoor to indoor, and the investment of indoor LTE deep coverage will continuously increase in the future. However, the traditional MDAS scheme has the problems of complex design, small coverage area and easy blocking of radio frequency signals by indoor walls. The traditional room division scheme has the defects of coordination of the materials and difficulty in later maintenance after construction due to the design problem, so that the traditional room division scheme is gradually replaced by a novel active room division. The key of the evolution of the traction technology is how the novel active room can solve the defects of the traditional indoor distribution system. Along with the diversification of the frequency bands used by operators, the equipment requirements are large, novel indoor distribution products are bound to develop towards the directions of multi-mode multi-frequency, intellectualization and miniaturization, and therefore a transmission medium is required to support faster deployment, lower cost and more convenient construction.
Although the conventional optical fiber can meet the transmission requirement of large bandwidth, the optical fiber cannot supply power to the remote units of the distributed system, and the remote units need to be separately introduced into a power access point. The problem can be solved by using the photoelectric composite cable, but the cost is high, and the cost cannot be controlled. The gigabit Ethernet power supply Protocol (POE) with mature technology is deeply favored by operators and customers based on the gigabit network cable with low price and very convenient construction and wiring work. Therefore, the system which utilizes the gigabit Ethernet for networking and power supply and transmits wireless communication signals in a full digital mode can fundamentally solve the pain of operators and meet the fundamental requirements of the operators.
At present, because the traditional MDAS system needs to directly couple the radio frequency signals into the machine room of an operator, the construction operation becomes very difficult, and because the MDAS is an analog coupling system, the background noise of the MDAS system increases along with the increase of the remote distance, and even the macro station system is easy to crash because the rise of the background noise is too large. In addition, the traditional indoor distribution system can only use optical fibers or a ten-gigabit Ethernet to transmit data due to poor algorithm and high transmission bandwidth requirement. If fiber optic transmission is used, either the remote units need to be designed separately for power access points or composite cables are used, which can be costly. The ten-million ethernet scheme is expensive in cost, and needs cat 6-type or more network cables to support, which further increases the use cost.
Disclosure of Invention
The invention aims to solve the problems of difficult system installation, high cost, limited coverage range, complex power supply, high later maintenance cost and the like in the prior art and provides a wireless communication system based on Ethernet full digital signal transmission.
The purpose of the invention is realized by the following technical scheme: the wireless communication system based on the Ethernet all-digital signal transmission specifically comprises an expansion distribution and combination subsystem and a signal receiving and transmitting subsystem which are connected through an Ethernet module, wherein a power module of the expansion distribution and combination subsystem supplies power to the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem.
Specifically, the power module of the expansion distribution and combination subsystem is specifically a power module based on a POE protocol, and the power module based on the POE protocol supplies power to the signal transceiver subsystem through the gigabit ethernet module.
Specifically, the expansion distribution and combination subsystem includes a reference clock source module, and a reference clock signal generated by the reference clock source module is used by the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem to synchronize the clock frequencies of the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem.
Specifically, the signal transceiving subsystem comprises an outdoor coupling transmitting subsystem and an indoor distributed covering subsystem, and the outdoor coupling transmitting subsystem and the indoor distributed covering subsystem are bidirectionally connected with the expansion distributing and combining subsystem through the Ethernet module; the outdoor coupling transmitting subsystem transmits the received macro station downlink signals to the indoor distributed coverage subsystem for transmitting through the expanding distribution and combining subsystem, and the indoor distributed coverage subsystem transmits the received macro station uplink signals to the outdoor coupling transmitting subsystem for transmitting through the expanding distribution and combining subsystem.
Specifically, the signal transceiving subsystem comprises an outdoor coupling transmitting subsystem and a plurality of indoor distributed covering subsystems, wherein the outdoor coupling transmitting subsystem is bidirectionally connected with the expansion distributing and combining subsystem through the Ethernet module and the indoor distributed covering subsystems through the Ethernet module; the outdoor coupling emission subsystem transmits the received downlink signals of the macro station to a plurality of indoor distributed coverage subsystems for emission after being branched by the expanding distribution and combination subsystem, and the indoor distributed coverage subsystems transmit the received uplink signals of the macro station to the outdoor coupling emission subsystem for emission after being combined by the expanding distribution and combination subsystem.
Specifically, the system comprises a master expansion distribution and combination subsystem and a plurality of slave expansion distribution and combination subsystems, the reference expansion distribution and combination subsystem is in bidirectional connection with the plurality of expansion distribution and combination subsystems, and the reference expansion distribution and combination subsystem, the plurality of expansion distribution and combination subsystems and the indoor distributed coverage subsystem are in bidirectional connection through an Ethernet module.
Specifically, the first ethernet module, the first central processing module and the second ethernet module, which are sequentially connected to the expanded distribution and combining subsystem, are disposed in an area where electricity is easy to be taken; the ethernet module is specifically a gigabit ethernet module.
Specifically, the outdoor coupling transmitting subsystem comprises a first modulation and demodulation module, a second central processing module and a third ethernet module which are connected in sequence, and is arranged outdoors in a radio frequency signal coverage area; the first modulation and demodulation module is used for converting the received downlink signal of the macro station into an IQ signal.
Specifically, the indoor distributed coverage subsystem includes a fourth ethernet module, a third central processing module, and a second modem module, and is disposed in an indoor area to be covered by the radio frequency signal; the second modulation and demodulation module is used for converting the received uplink signal of the macro station into a digital IQ signal.
Specifically, the extended distribution and combining subsystem further includes a data caching and forwarding module, where the data caching and forwarding module is configured to cache a digitized IQ signal sent by the outdoor coupling transmission subsystem and/or the indoor distributed coverage subsystem, and discard the digitized IQ data, which is transmitted to the extended distribution and combining subsystem by the indoor distributed coverage subsystem and received before a trigger point, by using a time point when the digitized IQ signal sent by the outdoor coupling transmission subsystem is received as the trigger point.
Compared with the prior art, the invention has the beneficial effects that:
(1) The expansion distribution and combination subsystem and the signal receiving and transmitting subsystem are connected through the Ethernet, so that the signal transmission loss is small, and the technology is mature and reliable; the power supply module of the expansion distribution and combination subsystem supplies power to the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem, and the power supply circuit is simple and convenient for later-period system maintenance.
(2) The power module of the expansion distribution and combination subsystem is specifically a power module based on a POE protocol, the power module based on the POE protocol supplies power to the signal receiving and transmitting subsystem through the gigabit Ethernet module, and the expansion distribution and combination subsystem needs to be connected with a 220V power supply, so that the whole system does not need any power supply to be accessed, the construction and use are greatly facilitated, and the problems of difficult property coordination and the like caused by the power taking requirement of the system can be greatly reduced.
(3) The expanding distribution and combination subsystem comprises a reference clock source module, and a reference clock signal generated by the reference clock source module is provided for the expanding distribution and combination subsystem and the signal receiving and transmitting subsystem to be used so as to synchronize the clock frequency of the wireless communication system.
(4) The signal transceiving subsystem comprises an outdoor coupling transmitting subsystem and an indoor distributed covering subsystem, and can receive and transmit uplink signals of the macro station and downlink signals of the macro station.
(5) The signal receiving and transmitting subsystem comprises an outdoor coupling transmitting subsystem and a plurality of indoor distributed covering subsystems, can receive and transmit uplink signals and downlink signals of the macro station, can flexibly configure the number of the indoor distributed covering subsystems according to the size of an actual using environment, can perform accurate covering, and achieves optimization of a covering effect and purchasing cost.
(6) The system comprises a reference expansion distribution and combination subsystem and a plurality of expansion distribution and combination subsystems, wherein the reference expansion distribution and combination subsystem is in bidirectional connection with the plurality of expansion distribution and combination subsystems, and the reference expansion distribution and combination subsystem, the plurality of expansion distribution and combination subsystems and the indoor distributed coverage subsystem are in bidirectional connection through the Ethernet module, so that the signal coverage effect is further optimized.
(7) The first Ethernet module, the first central processing module and the second Ethernet module which are sequentially connected with the expanding distribution and combining subsystem are arranged in the area easy to take electricity to supply power for the expanding distribution and combining subsystem, the outdoor coupling emission subsystem and the indoor distributed covering subsystem, so that a power supply link of the system is simplified, and later-period system maintenance is facilitated. Furthermore, the invention adopts gigabit Ethernet module to transmit signal, the transmission line technology is mature and reliable, and the cost is low.
(8) The outdoor coupling transmitting subsystem comprises a first modulation and demodulation module, a second central processing module and a third Ethernet module which are connected in sequence, is arranged outdoors in a radio frequency signal coverage area, does not need to enter an operator machine room for broken line coupling, avoids interference and damage to the existing system of the operator, and also can avoid inconvenience in coordination of certain properties. The first modulation and demodulation module is used for converting the received downlink signal of the macro station into an IQ signal to realize digital transmission of the signal.
(9) The indoor distributed coverage subsystem comprises a fourth Ethernet module, a third central processing module and a second modulation and demodulation module, is arranged in an indoor area needing radio frequency signal coverage, can be installed in an indoor space in a targeted manner, can perform accurate coverage, and optimizes the coverage effect. The second modulation and demodulation module is used for converting the received uplink signal of the macro station into a digital IQ signal to realize digital transmission of the signal. The system of the invention uses digital transmission in the whole link, and has no any noise deterioration except the computable bottom noise lifted by the digital combination, thereby being convenient for controlling the bottom noise of the macro station system and avoiding the system breakdown phenomenon caused by too much deterioration of the bottom noise of the macro station system.
(10) The extended distribution and combination subsystem further comprises a data caching and forwarding module, wherein the data caching and forwarding module is used for caching the digitized IQ signals sent by the outdoor coupling transmission subsystem and/or the indoor distributed coverage subsystem, and discarding the digitized IQ data transmitted from the indoor distributed coverage subsystem to the extended distribution and combination subsystem, which is received before the trigger point, by taking the time point of receiving the digitized IQ signals sent by the outdoor coupling transmission subsystem as the trigger point, so as to ensure the reliability and accuracy of system data transmission.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the figure:
FIG. 1 is a block diagram of a system according to embodiment 1 of the present invention;
fig. 2 is a block diagram of an extended distribution and combining subsystem in embodiment 1 of the present invention;
fig. 3 is a block diagram of an outdoor coupled transmitting subsystem in embodiment 1 of the present invention;
fig. 4 is a block diagram of an indoor distributed coverage subsystem according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of downlink signaling in the communication system according to embodiment 1 of the present invention;
fig. 6 is a schematic diagram of uplink signaling in the communication system according to embodiment 1 of the present invention;
FIG. 7 is a block diagram of a system according to embodiment 2 of the present invention;
fig. 8 is a system block diagram of embodiment 3 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are directions or positional relationships described based on the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, in embodiment 1, a wireless communication system based on ethernet full digital signal transmission specifically includes an expansion distribution and combination subsystem WDTS and a signal transceiving subsystem connected via an ethernet module, and a power module of the expansion distribution and combination subsystem supplies power to the expansion distribution and combination subsystem and the signal transceiving subsystem.
Furthermore, the signal transceiving subsystem comprises an outdoor coupling transmitting subsystem, an outdoor coupling transmitting subsystem and an indoor distributed covering subsystem, wherein the outdoor coupling transmitting subsystem is in bidirectional connection with the expansion distributing and combining subsystem through the outdoor coupling transmitting subsystem and the indoor distributed covering subsystem through the Ethernet module; the outdoor coupling transmitting subsystem transmits the received macro station downlink signals to the indoor distributed covering subsystem for transmitting through the expanding, distributing and combining subsystem, and the indoor distributed covering subsystem transmits the received macro station uplink signals to the outdoor coupling transmitting subsystem for transmitting through the expanding, distributing and combining subsystem.
Further, as shown in fig. 2, the first ethernet module, the first central processing module and the second ethernet module, which are sequentially connected to the expanded distribution and combining subsystem, are disposed in an area where electricity is easily taken, such as an elevator shaft or a property room. The ethernet module in this embodiment is specifically a gigabit ethernet module, and the transmission line technology is mature and reliable, and the cost is low; the central processing module in this embodiment is specifically a central processing module FPGA.
Further, as shown in fig. 3-4, the outdoor coupling transmitting subsystem includes a first modem module, a second central processing module and a third ethernet module connected in sequence, and is disposed outdoors in the radio frequency signal coverage area for coupling and transmitting signals of 4G/3G/2G macro stations such as FDD-LTE/TD-LTE, WCDMA/TD-SCDMA/CDMA200, GSM/DCS/PCS/CDMA, etc.; the indoor distributed coverage subsystem comprises a fourth Ethernet module, a third central processing module and a second modulation and demodulation module and is arranged in an indoor area needing radio-frequency signal coverage; the modulation and demodulation module is used for converting the received macro station downlink signal or the macro station uplink signal into an IQ signal, the full link uses digital transmission, except the calculated bottom noise lifted by digital combination, no noise deterioration exists any more, the control of the bottom noise of the macro station system is facilitated, and the system breakdown phenomenon caused by too much bottom noise deterioration of the macro station system is avoided.
Further, as shown in fig. 5, the downlink signaling of the wireless communication system based on ethernet all-digital signaling specifically includes:
the radio frequency link in the outdoor coupling transmitting subsystem of the outdoor coupling transmitting subsystem is coupled with a macro station downlink signal, and the downlink signal is amplified, filtered and down-converted by the first modem, then converted into a serial intermediate frequency digital IQ signal and transmitted to the second central processing module FPGA chip through the LVDS bus. The second central processing module FPGA chip pre-compresses the intermediate frequency IQ signal, and reduces the data volume to realize gigabit Ethernet transmission. Meanwhile, the second central processing module FPGA chip performs rate matching on the intermediate-frequency IQ signals according to an Ethernet frame format, and then transmits the intermediate-frequency IQ signals to the third gigabit Ethernet module through the SGMII bus, the third gigabit Ethernet module packages the intermediate-frequency signals into a standard Ethernet packet, and the standard Ethernet packet is transmitted to the expansion distribution and combination subsystem through a transformer and an RJ45 network port by using a gigabit network cable. After a first Ethernet module of the expansion distribution and combination subsystem is connected with an RJ45 network port of the outdoor coupling emission subsystem and a standard external network packet received by the transformer, the standard external network packet is transmitted to a first central processing module FPGA chip through an SGMII bus, the first central processing module FPGA chip distributes and processes the intermediate frequency IQ signal, downlink intermediate frequency IQ signals of the macro station are respectively transmitted to interfaces corresponding to all indoor distributed coverage subsystems, and then are transmitted to second gigabit Ethernet modules corresponding to all indoor distributed coverage subsystems through the SGMII bus, and the second gigabit Ethernet modules pack the intermediate frequency signal into the standard Ethernet packet and then transmit the standard Ethernet packet to all indoor distributed coverage subsystems through the transformer and the RJ45 network port. The fourth Ethernet module in the indoor distributed coverage subsystem processes the Ethernet packet into an Ethernet-type intermediate-frequency IQ signal after passing through an RJ45 network port and a standard external network packet received by a transformer, transmits the Ethernet-type intermediate-frequency IQ signal to a third central processing module FPGA chip through an LVDS bus so as to restore the Ethernet-type intermediate-frequency IQ signal into a serial intermediate-frequency digitized IQ signal, transmits the serial intermediate-frequency digitized IQ signal to a second modem through an SGMII bus, performs DAC processing on the Ethernet-type intermediate-frequency IQ signal by the second modem, performs operations such as up-conversion, filtering and amplification, converts the up-conversion, the filtering, and the like to a macro-station radio-frequency downlink signal, processes the radio-frequency amplification filtering link in the indoor distributed coverage subsystem, and finally transmits the radio-frequency downlink signal to an indoor space through an antenna for receiving and use by user equipment.
Further, as shown in fig. 6, the uplink signal transmission of the wireless communication system based on ethernet all-digital signal transmission specifically includes:
and a radio frequency link of the indoor distributed coverage subsystem receives a macro station radio frequency uplink signal transmitted by a user, the macro station radio frequency uplink signal is amplified, filtered and down-converted through the second modem, then the macro station radio frequency uplink signal is converted into a serial intermediate frequency digital IQ signal through a high-speed ADC in the second modem, and the serial intermediate frequency digital IQ signal is transmitted to the third central processing module FPGA chip through the LVDS bus. The third central processing module FPGA chip pre-compresses the intermediate frequency IQ signal, and reduces the data volume to realize gigabit Ethernet transmission. Meanwhile, the third central processing module FPGA chip carries out rate matching on the intermediate frequency IQ signals according to an Ethernet frame format, the intermediate frequency IQ signals are transmitted to a fourth gigabit Ethernet module through an SGMII bus and are packaged into standard Ethernet packets, the standard Ethernet packets are transmitted to a second gigabit Ethernet module of the extended distribution and combination subsystem through a transformer and an RJ45 network port and are transmitted to the second gigabit Ethernet module of the extended distribution and combination subsystem through a gigabit network cable, the second gigabit Ethernet module is connected with the RJ45 network port of each indoor distributed coverage subsystem and the standard external network packets received by the transformer and processes the standard external network packets to convert the standard external network packets into Ethernet-type intermediate frequency IQ signals, the Ethernet-type intermediate frequency IQ signals are transmitted to the first central processing module FPGA chip through the SGMII bus to carry out rate matching, the received macro station uplink intermediate frequency IQ signals are combined and gathered to an interface corresponding to the outdoor coupling transmission subsystem through combination processing, the received macro station uplink intermediate frequency IQ signals are transmitted to the third gigabit Ethernet module corresponding to be packaged into the standard Ethernet packets through the SGMII bus, and the RJ45 network port are transmitted to the outdoor coupling transmission subsystem, and the uplink signals are transmitted to the outdoor coupling transmission subsystem through the SGMII bus, and the outdoor coupling transmission subsystem, and the uplink signals are transmitted back to realize the uplink signal return of the uplink link. After a third gigabit Ethernet module of the outdoor coupling transmitting subsystem receives a standard external network packet through an RJ45 network port and a transformer, the standard external network packet is processed into an Ethernet-type intermediate-frequency IQ signal, the Ethernet-type intermediate-frequency IQ signal is transmitted to a second central processing module FPGA chip through an SGMII bus to be stored and decompressed, the Ethernet-type intermediate-frequency IQ signal is transmitted to a modem through an LVDS bus, the Ethernet-type intermediate-frequency IQ signal is recovered into an intermediate-frequency radio-frequency signal through DAC processing of the modem, the operations of up-conversion, filtering, amplification and the like are carried out, the intermediate-frequency radio-frequency signal is converted into a macro-station radio-frequency uplink signal, the macro-station radio-frequency uplink signal is processed through a radio-frequency amplification filtering link, and the macro-station radio-frequency uplink signal is finally transmitted to an outdoor macro-station through an antenna.
Further, the power module of the expansion distribution and combination subsystem is specifically a PSE power module based on a POE protocol, and the power module based on the POE protocol supplies power to the outdoor coupling transmission subsystem and the indoor distributed coverage subsystem through the gigabit ethernet module. More specifically, the power module of the extended distribution and combining subsystem is powered by a standard 220V commercial power, and is converted into a 57V working voltage through an internal voltage-stabilizing conversion circuit to supply power to the outside and supply power for the extended distribution and combining subsystem. The expansion distribution and combination subsystem is internally integrated with a PSE power module based on a standard 802.1bt protocol, and can respectively provide power supply current with maximum power of 30W based on a POE protocol standard for each RJ45 network port of the expansion distribution and combination subsystem. The indoor distributed coverage system comprises an outdoor coupling emission subsystem, an indoor distributed coverage subsystem and an outdoor coupling distribution subsystem, wherein standard POE powered modules based on an 802.1at protocol are integrated in the outdoor coupling emission subsystem and the indoor distributed coverage subsystem respectively, after the Ethernet cable of networking is connected with an expansion distribution and combination subsystem, a PSE module in the expansion distribution and combination subsystem starts to supply power to the outdoor coupling emission subsystem and the indoor distributed coverage subsystem, POE modules in the outdoor coupling emission subsystem and the indoor distributed coverage subsystem start to generate working voltage, the outdoor coupling emission subsystem and the indoor distributed coverage subsystem start to work after self-checking initialization is completed.
Furthermore, the expansion distribution and combination subsystem comprises a reference clock source module, and a reference clock signal generated by the reference clock source module is used by the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem so as to synchronize the clock frequencies of the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem. Specifically, a reference clock of the whole system is generated and provided by a reference clock source module of the expansion distribution and combination subsystem, a high-precision clock crystal oscillator is integrated inside the reference clock source module to generate a stable clock source, and working clocks with different frequencies are generated through a PLL circuit inside a clock processing chip. The generated clock is provided to the first gigabit Ethernet module and the second gigabit Ethernet module for use, and the Ethernet link working clock signal is generated through a PLL circuit inside the gigabit Ethernet module. In the process of communication between the expansion distribution and combination subsystem and the outdoor coupling transmission subsystem and the indoor distributed coverage subsystem, working clock signals of the Ethernet link are transmitted to a third gigabit Ethernet module and a third gigabit Ethernet module of the outdoor coupling transmission subsystem and the indoor distributed coverage subsystem along with Ethernet signal lines, and reference clocks which are homologous to clocks of the expansion distribution and combination subsystem are recovered and expanded through the Ethernet modules; the reference clock generates the required working clocks with different frequencies through the clock processing chip PLL circuit in the outdoor coupling transmitting subsystem and the indoor distributed covering subsystem. When the whole system works, the working clock is from the only crystal oscillator clock source generated by the reference clock source module in the expanded distribution and combination subsystem, and the clocks of the subsystems are always kept synchronous.
The outdoor coupling transmitting subsystem of the invention uses the radio frequency wireless coupling mode, only needs to be installed at a proper position of the building roof, can finish the downlink coupling and the uplink transmitting of the macro station signal, does not need to enter the machine room of an operator for broken line coupling, avoids the interference and the damage to the existing system of the operator, and also can avoid the inconvenience in coordination of some properties. The expansion distribution and combination subsystem is simultaneously connected with an outdoor coupling emission subsystem and an indoor distribution type covering subsystem, the full link uses digital transmission, except the computable bottom noise lifted by the digital combination, the system has no any noise deterioration any more, the control of the bottom noise of the macro station system is convenient, and the system breakdown phenomenon caused by too much bottom noise deterioration of the macro station system is avoided. The indoor distributed coverage subsystem uses a distributed layout mode, can be installed in an indoor space in a targeted mode, and achieves optimization of coverage effect and purchasing cost. Further, aiming at the defects of the prior art of the traditional optical fiber indoor distribution system, the system only uses standard cat 5-type network cables, and has mature and reliable transmission line technology and low cost. In addition, the system of the invention adopts a PoE power supply mode, except that the expansion distribution and combination subsystem needs to be connected with a 220V power supply, the whole system does not need any power supply to be accessed, the construction and the use can be greatly facilitated, and the problems of difficult property coordination and the like caused by the power-taking requirement of the system can be greatly reduced.
Example 2
The present embodiment has the same inventive concept as embodiment 1, and provides a gigabit ethernet-based all-digital wireless communication system based on embodiment 1, as shown in fig. 7, including an extended distribution and combining subsystem, an outdoor coupled transmission subsystem, and n indoor distributed coverage subsystems, where the outdoor coupled transmission subsystem and the several indoor distributed coverage subsystems are bidirectionally connected to the extended distribution and combining subsystem via a gigabit ethernet module, and the others are the same as the wireless communication system in embodiment 1.
Furthermore, the outdoor coupling subsystem is arranged outdoors and used for coupling and transmitting the macro station signals, transmitting and receiving the digitized wireless signals through a PoE network cable, and acquiring a working power supply from the expansion distribution and combination subsystem; the expansion distribution and combination subsystem is arranged in places such as indoor elevator shafts and property rooms convenient for installation, construction and electricity taking, is responsible for receiving the digital wireless signals transmitted by the outdoor coupling subsystem and distributes the digital wireless signals to the n indoor distributed coverage subsystems; and simultaneously, receiving the digitized wireless signals transmitted by the n indoor distributed coverage subsystems, combining the digitized wireless signals and transmitting the combined signals to the indoor distributed coverage subsystems. The expansion distribution and combination subsystem provides working power supply for the outdoor coupling subsystem and the indoor distributed coverage subsystem through network cables. The indoor distributed coverage subsystem is installed in an indoor area needing wireless coverage and is responsible for transmitting and receiving wireless signals so as to realize coverage and return transmission. The digital wireless signal is interacted with the expanding distribution and combination subsystem through the PoE network cable, and meanwhile, the working power supply is also obtained from the expanding distribution and combination subsystem and is not independently powered.
The indoor distributed coverage subsystem uses a distributed layout mode, can be installed in an indoor space in a targeted mode, can perform accurate coverage, and optimizes the coverage effect. The system can flexibly configure the number of indoor distributed coverage subsystems according to the size of an actual use environment, and the optimization of the coverage effect and the purchasing cost is realized.
Example 3
The present embodiment has the same inventive concept as embodiment 1, and provides a gigabit ethernet-based all-digital wireless communication system based on embodiment 1, as shown in fig. 8, including a master extension distribution and combining subsystem, a slave extension distribution and combining subsystem, an outdoor coupled transmitting subsystem, and n indoor distributed coverage subsystems. The master expansion distribution and combination subsystem and the slave expansion distribution and combination subsystem are connected in two directions, the master expansion distribution and combination subsystem, the slave expansion distribution and combination subsystem and the indoor distributed coverage subsystem are connected in two directions through the ethernet module, and the rest of the system is the same as the wireless communication system in the embodiment 1.
Further, the master expansion distribution and combination subsystem comprises a first reference clock source module, and a reference clock signal generated by the first reference clock source module is provided for the reference expansion distribution and combination subsystem, the slave expansion distribution and combination subsystem, the outdoor coupling subsystem and the indoor distributed coverage subsystem to use so as to synchronize the clock frequency of the wireless communication system.
Furthermore, the expanded distribution and combination subsystem further comprises a first data caching and forwarding module and a second data caching and forwarding module, the first data caching and forwarding module is used for caching the digitized IQ signals sent by the outdoor coupling transmission subsystem, and the second data caching and forwarding module is used for caching the digitized IQ signals sent by the indoor distributed coverage subsystem. Specifically, in the process of transmitting the uplink signal of the macro station, because the lengths of the network cables connected to the expansion distribution and combining subsystems of each indoor distributed coverage subsystem are different, and the starting time of each indoor distributed coverage subsystem is different, it is inevitable that the time for the initial frame of the IQ data to reach the expansion distribution and combining subsystems is different after each indoor distributed coverage subsystem starts working, and if a system frame synchronization method is not considered, it is inevitable that invalid data transmitted by the indoor distributed coverage subsystems are taken as valid data to be collected, so that the lengths of the frames transmitted by each indoor distributed coverage subsystem are different, and the implementation of a digital combining algorithm of the expansion distribution and combining subsystems is affected. Therefore, with the gigabit ethernet-powered and all-digital wireless communication system, the system uplink frame synchronization scheme adopts the following method: after the whole system is electrified, each subsystem respectively completes self-checking and initialization. After each subsystem respectively completes the power-on self-test and the initialization work, the expansion distribution and combination subsystem is firstly switched into a data receiving and caching working state and starts to receive IQ data frames transmitted by the indoor distributed coverage subsystem unit and the outdoor coupling transmission subsystem unit. Firstly, default IQ data frames transmitted by n indoor distributed coverage subsystem units in uplink arrive at uplink receiving interfaces of the extended distribution and combination subsystem at different times. And the expansion distribution and combination subsystem puts all the received data into the corresponding data storage and forwarding module for circular caching. When the outdoor coupling transmitting subsystem unit starts to work normally and starts to transmit a first IQ data frame to the expansion distributing and combining subsystem, the expansion distributing and combining subsystem takes the moment as a trigger point, discards the digitized IQ data stored in the second cache forwarding module before the trigger point, and re-receives the uplink IQ signal transmitted by the indoor distributed coverage subsystem as effective data. And the main expansion distribution and combination subsystem takes the trigger point time as the frame synchronization reference time as the reference time of the digital combination algorithm, performs combination calculation on uplink multi-path IQ data, generates combined uplink IQ data and sends the combined uplink IQ data to the outdoor coupling transmitting subsystem.
The expansion distribution and combination subsystem can also comprise a plurality of slave expansion distribution and combination subsystems, and can be installed in an indoor space pertinence manner by combining a distributed layout mode of a plurality of indoor distributed coverage subsystems, so that accurate coverage is carried out, and the coverage effect is optimized. The system can flexibly configure the number of indoor distributed coverage subsystems according to the size of an actual use environment, and the optimization of the coverage effect and the purchasing cost is realized.
The above detailed description is for the purpose of describing the invention in detail, and it should not be construed that the detailed description is limited to the description, and it will be apparent to those skilled in the art that various modifications and substitutions can be made without departing from the spirit of the invention.
Claims (9)
1. The wireless communication system based on the Ethernet full digital signal transmission is characterized in that: the system comprises an expansion distribution and combination subsystem and a signal receiving and transmitting subsystem which are connected through an Ethernet module, wherein a power module of the expansion distribution and combination subsystem supplies power to the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem; the signal receiving and transmitting subsystem comprises an outdoor coupling transmitting subsystem and an indoor distributed covering subsystem, and the outdoor coupling transmitting subsystem and the indoor distributed covering subsystem are in bidirectional connection with the expansion distributing and combining subsystem through the Ethernet module;
the expansion distribution and combination subsystem further comprises a data caching and forwarding module, wherein the data caching and forwarding module is used for caching the digital IQ signals sent by the outdoor coupling transmission subsystem and/or the indoor distributed coverage subsystem, and by taking the time point of receiving the digital IQ signals sent by the outdoor coupling transmission subsystem as a trigger point, discarding the digital IQ data transmitted from the indoor distributed coverage subsystem to the expansion distribution and combination subsystem, which is received before the trigger point, and re-receiving the uplink IQ signals transmitted by the indoor distributed coverage subsystem as valid data.
2. The wireless communication system according to claim 1, wherein: the power module of the expansion distribution and combination subsystem is specifically a power module based on a POE protocol, and the power module based on the POE protocol supplies power to the signal receiving and transmitting subsystem through the gigabit Ethernet module.
3. The wireless communication system according to claim 2, wherein: the expansion distribution and combination subsystem comprises a reference clock source module, and a reference clock signal generated by the reference clock source module is used by the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem so as to synchronize the clock frequencies of the expansion distribution and combination subsystem and the signal receiving and transmitting subsystem.
4. The wireless communication system according to claim 3, wherein: the outdoor coupling transmitting subsystem transmits the received macro station downlink signals to the indoor distributed covering subsystem for transmitting through the expanding, distributing and combining subsystem, and the indoor distributed covering subsystem transmits the received macro station uplink signals to the outdoor coupling transmitting subsystem for transmitting through the expanding, distributing and combining subsystem.
5. The wireless communication system according to claim 3, wherein: the signal receiving and transmitting subsystem comprises an outdoor coupling transmitting subsystem and a plurality of indoor distributed covering subsystems, wherein the outdoor coupling transmitting subsystem is bidirectionally connected with the expansion distributing and combining subsystem through the Ethernet module and the indoor distributed covering subsystems through the Ethernet module.
6. The wireless communication system according to claim 5, wherein: the system comprises a main expansion distribution and combination subsystem and a plurality of slave expansion distribution and combination subsystems, wherein the main expansion distribution and combination subsystem and the plurality of slave expansion distribution and combination subsystems are connected in a bidirectional mode, and the main expansion distribution and combination subsystem, the plurality of slave expansion distribution and combination subsystems and the indoor distributed coverage subsystem are connected in a bidirectional mode through an Ethernet module.
7. The wireless communication system according to claim 4 or 6, wherein: the first Ethernet module, the first central processing module and the second Ethernet module which are sequentially connected with the expansion distribution and combination subsystem are arranged in an area which is easy to get electricity; the ethernet module is specifically a gigabit ethernet module.
8. The wireless communication system according to claim 4 or 6, wherein: the outdoor coupling transmitting subsystem comprises a first modulation and demodulation module, a second central processing module and a third Ethernet module which are connected in sequence and is arranged outdoors in a radio frequency signal coverage area; the first modulation and demodulation module is used for converting the received macro station downlink signal into an IQ signal.
9. The wireless communication system according to claim 4 or 6, wherein: the indoor distributed coverage subsystem comprises a fourth Ethernet module, a third central processing module and a second modulation and demodulation module and is arranged in an indoor area needing radio-frequency signal coverage; the second modulation and demodulation module is used for converting the received uplink signal of the macro station into a digital IQ signal.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233993A (en) * | 2017-01-22 | 2018-06-29 | 南京邮电大学 | Optimization method is realized in a kind of wireless relay transmission based on USRPN200 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044493Y (en) * | 2007-02-13 | 2008-04-02 | 杰脉通信技术(上海)有限公司 | TD-SCDMA indoor distribution system |
| CN101426210B (en) * | 2007-11-02 | 2010-07-14 | 杰脉通信技术(上海)有限公司 | TD-SCDMA intermediate frequency indoor distributing system |
| CN104618917B (en) * | 2015-02-09 | 2018-09-14 | 京信通信系统（中国）有限公司 | In-door covering device and multi-standard cover system |
| CN204442703U (en) * | 2015-02-09 | 2015-07-01 | 京信通信技术(广州)有限公司 | In-door covering device and multi-modulation scheme covering system |
| BR112017020741A2 (en) * | 2015-04-03 | 2018-07-17 | Wlanjv Inc | multi-service distributed antenna system |
| US10819470B2 (en) * | 2018-01-12 | 2020-10-27 | Intel IP Corporation | Behavior of user equipment (UE) in scenarios of conflicting resource assignments in new radio (NR) systems |
-
2019
- 2019-12-30 CN CN201911396362.6A patent/CN113132118B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Non-Patent Citations (2)
| Title |
|---|
| "R1-1806321_IAB_final".3GPP tsg_ran\WG1_RL1.2018,全文. * |
| 吴扬东.沿海高层建筑内覆盖质量的优化方案和案例.广西通信技术.2012,全文. * |
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