CN112770333A - 5G NR wireless distributed frequency shift system and frequency shift method - Google Patents
5G NR wireless distributed frequency shift system and frequency shift methodDownload PDFInfo
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- CN112770333A CN112770333ACN202011463736.4ACN202011463736ACN112770333ACN 112770333 ACN112770333 ACN 112770333ACN 202011463736 ACN202011463736 ACN 202011463736ACN 112770333 ACN112770333 ACN 112770333A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- 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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a 5G NR wireless distributed frequency shift system and a frequency shift method.
Background
In an indoor coverage scene, the feeder link frequency of a passive DAS of a traditional 4G system can only be supported in 3G, and the wireless coverage of 5G frequency over 3G-3G cannot be realized by directly utilizing the existing indoor passive DAS and passive devices, the loss of the existing passive devices over 3G is very large, index optimization of the passive devices and upgrading of the devices are required to be promoted for improvement of the existing DAS, and the realization period is long and difficult.
In 5G evolution, at least 2x2 MIMO is needed, a traditional passive DAS indoor coverage distribution system basically covers a single antenna in engineering and construction, 5G multi-stream coverage evolution cannot be met, even if the number of 5G sites is increased, the problem of deep penetration loss of 3.5GHz and 4.8GHz is more prominent, and a 5G indoor distribution system needs to be newly built in a plurality of 5G indoor distribution scenes, so that compatibility with the traditional indoor distributed passive DAS has problems, for example, the problem of high loss caused by high frequency is inconvenient to use with the traditional 4G system, and the advantage of 5G multi-stream characteristics is difficult to embody when the traditional 4G system coexists.
Disclosure of Invention
The invention provides a 5G NR wireless distributed frequency shift system and a frequency shift method, which are used for overcoming the defects in the prior art.
In a first aspect, the present invention provides a 5G NR wireless distributed frequency shift system, including:
a master unit PAU and a distributed unit PRU, wherein:
the main unit PAU is used for receiving a preset high-frequency signal sent by a 5G macro station, converting the preset high-frequency signal into two paths of frequency-shifting radio-frequency signals with different preset low frequencies, sending the two paths of frequency-shifting radio-frequency signals to the distributed unit PRU, receiving a return signal of the distributed unit PRU, converting the return signal into the preset high-frequency signal, and sending the preset high-frequency signal to the 5G macro station;
the distributed unit PRU is used for receiving the two paths of frequency shift radio frequency signals, converting the two paths of frequency shift radio frequency signals into the preset high frequency signals, transmitting the preset high frequency signals to the UE, receiving signals of the UE, shifting the frequency of the signals to the two paths of frequency shift radio frequency signals, and transmitting the two paths of frequency shift radio frequency signals back to the main unit PAU.
Further, the master unit PAU is further configured to implement air interface synchronization with the distributed unit PRU.
Further, the master unit PAU comprises a first synchronization module, a first OOK modulation module, a frequency conversion module, a first forward transmission link, and a first reverse reception link, wherein:
the first synchronization module is respectively connected with the frequency conversion module and the radio frequency switch of the first reverse receiving link;
the first OOK modulation module is connected to the first synchronization module and the first forward transmit link, respectively;
the first forward transmitting link and the first reverse receiving link are both used for transmission through a built-in omnidirectional antenna.
Furthermore, the first synchronization module comprises an AD integrated transceiver and an FPGA, the AD integrated transceiver collects the preset high-frequency signal, converts the preset high-frequency signal into a time domain signal, and analyzes the 5G synchronization signal through the FPGA processing.
Further, the distributed unit PRU includes a phase-locked loop, a second OOK modulation module, a second synchronization module, a second forward transmit link, and a second reverse receive link, wherein:
the second OOK modulation module is respectively connected to a built-in omnidirectional antenna and the second synchronization module, wherein the built-in omnidirectional antenna is used for being connected to the main unit PAU;
the second synchronization module is respectively connected with the second OOK modulation module, the phase-locked loop, and the radio frequency switch of the second reverse receive link.
Further, the master unit PAU is connected to several distributed units PRU.
In a second aspect, the present invention further provides a 5G NR wireless distributed frequency shift method, including:
the method comprises the steps that a main unit PAU receives a preset high-frequency signal of a 5G macro station to obtain a coupled base station signal, and the coupled base station signal is divided into a frequency shift signal and a synchronous signal;
the distributed unit PRU receives the frequency shift signal, completes downlink transmission and coverage of the frequency shift signal, receives the synchronization signal and completes air interface synchronization with the main unit PAU;
the distributed unit PRU receives a terminal frequency signal from UE, converts the terminal frequency signal into a wireless radio frequency signal through down-conversion and transmits the wireless radio frequency signal back to the main unit PAU, and the wireless radio frequency signal is converted into a high-frequency radio frequency signal through up-conversion of the main unit PAU and transmits the high-frequency radio frequency signal back to a base station.
Further, the main unit PAU receives a preset high frequency signal of the 5G macro station to obtain a coupled base station signal, and divides the coupled base station signal into a frequency shift signal and a synchronization signal, which specifically includes:
the main unit PAU receives the preset high-frequency signal through passive device feeder line coupling, and converts the frequency shift signal into a preset low-frequency band frequency shift radio frequency signal through down-conversion processing of a frequency conversion module;
amplifying the preset low-frequency-band frequency-shift radio-frequency signal through a power amplifier of a transmitting link, processing the preset low-frequency-shift radio-frequency signal by using a loop filter, converting the preset low-frequency-shift radio-frequency signal into a first radio-frequency signal and a second radio-frequency signal, and wirelessly transmitting the first radio-frequency signal and the second radio-frequency signal to the distributed unit PRU through an air interface of a transmitting terminal;
the synchronization signals are converted into baseband signals through an AD integrated transceiver inside a first synchronization module, a main synchronization signal PSS, an auxiliary synchronization signal SSS and a demodulation reference signal DMRS are extracted from the baseband signals through an FPGA, the baseband signals are converted into a first path of synchronization signals and a second path of synchronization signals, the first path of synchronization signals are used for controlling radio frequency of a first forward transmission link to be switched on and off, and the second path of synchronization signals are processed through a first OOK adjusting module and then are wirelessly transmitted to the distributed unit PRU through an air interface of a transmitting end.
Further, the receiving, by the PRU, the frequency shift signal, completing downlink transmission and coverage of the frequency shift signal, and receiving the synchronization signal, completing air interface synchronization with the PAU, which specifically includes:
converting the first radio frequency signal or the second radio frequency signal into an initial high-frequency radio frequency signal after radio frequency mixing, up-conversion and filtering processing of a phase-locked loop, and transmitting the initial high-frequency radio frequency signal to the UE through a built-in omnidirectional antenna after the initial high-frequency radio frequency signal is amplified by a power amplifier and processed by a circulator filter;
receiving an air interface radio frequency signal from the main unit PAU through an air interface antenna, processing the air interface radio frequency signal through a second OOK modulation module and a second synchronization module, and analyzing the air interface radio frequency signal to obtain a first switching signal and a second switching signal of opening and closing uplink and downlink radio frequencies, wherein the first switching signal is used for controlling switching between opening and closing of a second reverse receiving link of the distributed unit PRU, and the second switching signal is used for controlling phase-locked loops of a second forward transmitting link and the second reverse receiving link.
Further, the distributed unit PRU receives a terminal frequency signal from the UE, converts the terminal frequency signal into a radio frequency signal through down conversion and transmits the radio frequency signal back to the main unit PAU, and converts the radio frequency signal into a high frequency radio frequency signal through up conversion of the main unit PAU and transmits the high frequency radio frequency signal back to the base station, which specifically includes:
down-converting the terminal frequency signal to the first radio frequency signal or the second radio frequency signal by the distributed unit PRU;
respectively processing the first radio frequency signal or the second radio frequency signal through a down-conversion low-frequency radio frequency signal filter, a low-noise amplifier and a circulator filter, and transmitting the processed first radio frequency signal or the processed second radio frequency signal through a built-in air interface antenna;
and performing up-conversion on the processed first radio frequency signal or the processed second radio frequency signal through a frequency conversion module to obtain the preset high-frequency signal, and transmitting the preset high-frequency signal back to the base station.
According to the 5G NR wireless distributed frequency shift system and the frequency shift method, the air interface frequency shift technical scheme is adopted, the frequencies of the receiving part and the transmitting part at the PAU end and the PRU end are different, the distributed units do not need to design a self-excitation elimination and isolation detection technology, and meanwhile MIMO signals can be transmitted at the PAU end and the PRU end, so that the cost is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a block diagram of a wireless distributed frequency shift system architecture provided by the present invention;
fig. 2 is a block diagram of a main unit PAU of the wireless frequency shift system provided by the present invention;
FIG. 3 is a block diagram of a PRU of a distributed unit of a wireless frequency shift system provided by the present invention;
fig. 4 is a flowchart illustrating a wireless frequency shift method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious 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.
Aiming at the problems in the prior art, the invention provides a 5G NR wireless distribution frequency shift system, which adopts a low-frequency band frequency shift scheme and an air interface synchronization technology, is not affected by the problems of complicated construction of link transformation and high-frequency loss of a passive DAS, synchronous signals are transmitted through an air interface, the problems of space self-excitation, air interface frequency offset and air interface link caused by large system gain are not worried, and the air interface synchronization technology is combined, so that the coverage of indoor services of a high-frequency 5G system can be effectively realized, and meanwhile, the old 4G passive DAS system is not required.
Fig. 1 is a block diagram of a wireless distributed frequency shift system architecture provided in the present invention, as shown in fig. 1, including: a master unit PAU and a distributed unit PRU, wherein:
the main unit PAU is used for receiving a preset high-frequency signal sent by a 5G macro station, converting the preset high-frequency signal into two paths of frequency-shifting radio-frequency signals with different preset low frequencies, sending the two paths of frequency-shifting radio-frequency signals to the distributed unit PRU, receiving a return signal of the distributed unit PRU, converting the return signal into the preset high-frequency signal, and sending the preset high-frequency signal to the 5G macro station;
the distributed unit PRU is used for receiving the two paths of frequency shift radio frequency signals, converting the two paths of frequency shift radio frequency signals into the preset high frequency signals, transmitting the preset high frequency signals to the UE, receiving signals of the UE, shifting the frequency of the signals to the two paths of frequency shift radio frequency signals, and transmitting the two paths of frequency shift radio frequency signals back to the main unit PAU.
Specifically, the wireless distributed frequency shift system adopts a two-stage scheme, namely a main unit PAU and a distributed unit PRU, a transmission link main unit PAU feeder line is coupled with and receives high-frequency (3.5G or 4.9G) same frequency spectrum signals of a 5G macro station, the signals are converted into two paths of low-frequency-band frequency shift radio frequency signals through radio frequency filtering conversion and down conversion processing, the two paths of low-frequency shift radio frequency signals are transmitted, meanwhile, the frequencies of the two paths of low-frequency shift frequency signals are different, MIMO transmission of the PAU and PRU system is convenient to realize, and the frequency shift schemes with different frequencies of the two paths of low-frequency shift frequency signals can ensure that signals do not interfere with each other when the system realizes multipath.
The distributed unit PRU wirelessly receives two paths of different frequency-shifted radio frequency signals, the radio frequency signals are converted into high-frequency 5G radio frequency signals through up-conversion and filtering, and the high-frequency 5G radio frequency signals are transmitted, so that wireless frequency-shifted 5G signals are transmitted. The receiving link distributed unit PRU receives signals from the UE, two paths of radio frequency signals with different frequencies are transmitted through the distributed unit PRU frequency shift to the low frequency, the same 5G radio frequency signals converted into the high frequency are received by the main unit PAU and transmitted to the 5G macro station, and transmission and amplification of a receiving link are achieved.
The frequency shift signal of the low frequency band can be realized by adopting a low frequency signal of 500-700M, the frequency band is mainly used for transmitting the broadcast television digital television, the low frequency band transmission line has the advantage of low loss, meanwhile, the coverage mode of the product is mainly used for indoor coverage of office scenes, office buildings, business circle pedestrian streets, factory factories and the like, and the coverage areas do not relate to the transmission of the digital television and are used for indoor communication transmission with small interference on wireless communication frequency.
By adopting the air interface frequency shift technical scheme, compared with the traditional wireless station, the frequency of the receiving and transmitting parts of the PAU end and the PRU end is not consistent, the distributed unit does not need to design self-excitation elimination and isolation detection technologies, and meanwhile, MIMO signals can be transmitted at the PAU end and the PRU end, so that the cost of the distributed unit system is greatly reduced. The frequency shift technology prevents air interface signals from being circularly amplified in a loop, and avoids self-excitation and interference generated by large gain among wireless stations.
Based on the above embodiment, the master unit PAU is further configured to implement air interface synchronization with the distributed unit PRU.
Specifically, the frequency synchronization problem between the main unit PAU and the distributed unit PRU is necessarily involved due to the frequency shift operation between the main unit and the distributed unit, and the main unit PAU feeder line is coupled with a 5G high-frequency base station signal, and one path of the signals is transmitted by a method behind a frequency conversion module and a power amplification module. In the other path, clock synchronization and uplink and downlink radio frequency switch switching signals in a 5G NR frequency TDD NR signal frame structure are extracted through baseband processing of a digital-to-analog converter (ADC) and a logic processor (FPGA), the uplink and downlink radio frequency switch switching signals are processed by an On-Off (OOK) modulation module and then output to a power amplifier, and the two paths of signals are combined and then enter the power amplifier for amplification. And synchronous transmission of the PMU frequency shift radio frequency signal and the switching signal of the main unit is realized.
The invention extracts the synchronous signal and the uplink and downlink switch switching signal in the TDD NR signal frame structure through the analog-to-digital converter ADC of the synchronous module and the FPGA baseband processing by adopting an air interface synchronization technology, thereby realizing the air interface synchronization between systems.
In accordance with any of the above embodiments, the master unit PAU comprises a first synchronization module, a first OOK modulation module, a frequency conversion module, a first forward transmission link, and a first reverse reception link, wherein:
the first synchronization module is respectively connected with the frequency conversion module and the radio frequency switch of the first reverse receiving link;
the first OOK modulation module is connected to the first synchronization module and the first forward transmit link, respectively;
the first forward transmitting link and the first reverse receiving link are both used for transmission through a built-in omnidirectional antenna.
The first synchronization module comprises an AD integrated transceiver and an FPGA, the AD integrated transceiver collects preset high-frequency signals, the preset high-frequency signals are converted into time domain signals, and 5G synchronization signals are analyzed through FPGA processing.
Specifically, as shown in fig. 2, the main unit PAU is connected to the base station, and the distributed unit PRU is spatially connected to the main unit PAU. The main unit PAU is internally provided with a synchronization module, an OOK modulation module, a frequency conversion module, a forward transmitting link and a reverse receiving link. The forward transmitting link and the reverse receiving link realize transmission through a built-in omnidirectional antenna, the synchronization module is linked with the frequency conversion module and a radio frequency switch of the reverse receiving link, and the OOK modulation module is linked with the synchronization module and the forward transmitting link.
The synchronous module internally comprises an AD integrated transceiver and a logic processor FPGA, converts radio frequency signals into time domain signals through collecting signals from the 5G base station, and analyzes 5G synchronous signals through FPGA processing.
Based on any of the above embodiments, the distributed unit PRU includes a phase-locked loop, a second OOK modulation module, a second synchronization module, a second forward transmission link, and a second reverse reception link, where:
the second OOK modulation module is respectively connected to a built-in omnidirectional antenna and the second synchronization module, wherein the built-in omnidirectional antenna is used for being connected to the main unit PAU;
the second synchronization module is respectively connected with the second OOK modulation module, the phase-locked loop, and the radio frequency switch of the second reverse receive link.
Wherein the master unit PAU is connected to several distributed units PRU.
Specifically, as shown in fig. 3, the distributed unit PRU is spatially connected to the main unit PAU through a built-in omnidirectional antenna, and the distributed unit has a built-in phase-locked loop, an OOK modem module, a synchronization module, a forward transmission link, and a reverse reception link. Meanwhile, the transmission and return of air interface signals are realized between the main unit PAU and the distributed unit PRU through a built-in omnidirectional antenna.
Here, one master unit PAU may implement the link between the N distributed units PRU.
According to the invention, the air interface wireless transceiving transmission is adopted between the main unit PAU and the distributed unit PRU, so that the feeder is not required to be rearranged during indoor coverage, the existing indoor distribution coverage system and the distributed units are independently constructed, the construction is simple, the layout is convenient, the cost is saved, and the existing indoor distribution system is not influenced.
Fig. 4 is a flowchart of a wireless frequency shift method provided in the present invention, as shown in fig. 4, including:
s1, the main unit PAU receives a preset high-frequency signal of the 5G macro station to obtain a coupled base station signal, and the coupled base station signal is divided into a frequency shift signal and a synchronous signal;
s2, the PRU receives the frequency shift signal, completes the downlink transmission and coverage of the frequency shift signal, and receives the synchronization signal, completes the air interface synchronization with the PAU;
s3, the PRU receives a terminal frequency signal from the UE, converts the terminal frequency signal into a radio frequency signal through down conversion, and transmits the radio frequency signal back to the PAU, and converts the radio frequency signal into a high frequency radio frequency signal through up conversion of the PAU and transmits the high frequency radio frequency signal back to the base station.
By adopting the air interface frequency shift technical scheme, the frequencies of the receiving and transmitting parts at the PAU end and the PRU end are not consistent, the distributed units do not need to design self-excitation elimination and isolation detection technologies, and simultaneously, MIMO signals can be transmitted at the PAU end and the PRU end, so that the cost is greatly reduced.
Based on the above embodiment, step S1 in the method specifically includes:
the main unit PAU receives the preset high-frequency signal through passive device feeder line coupling, and converts the frequency shift signal into a preset low-frequency band frequency shift radio frequency signal through down-conversion processing of a frequency conversion module;
amplifying the preset low-frequency-band frequency-shift radio-frequency signal through a power amplifier of a transmitting link, processing the preset low-frequency-shift radio-frequency signal by using a loop filter, converting the preset low-frequency-shift radio-frequency signal into a first radio-frequency signal and a second radio-frequency signal, and wirelessly transmitting the first radio-frequency signal and the second radio-frequency signal to the distributed unit PRU through an air interface of a transmitting terminal;
the synchronization signals are converted into baseband signals through an AD integrated transceiver inside a first synchronization module, a main synchronization signal PSS, an auxiliary synchronization signal SSS and a demodulation reference signal DMRS are extracted from the baseband signals through an FPGA, the baseband signals are converted into a first path of synchronization signals and a second path of synchronization signals, the first path of synchronization signals are used for controlling radio frequency of a first forward transmission link to be switched on and off, and the second path of synchronization signals are processed through a first OOK adjusting module and then are wirelessly transmitted to the distributed unit PRU through an air interface of a transmitting end.
Specifically, the main unit PAU receives a high-frequency (3.5G or 4.9G) radio frequency signal of the 5G macro station through passive device feeder coupling, the coupled base station signal is divided into two paths after passing through the main unit PAU, one path is subjected to down-conversion processing by the frequency conversion module to be changed into a low-frequency-band frequency shift radio frequency signal, the low-frequency-band frequency shift radio frequency signal is changed into two paths of radio frequency signals with frequencies of F1 and F2 through power amplification and circulator filtering of a transmitting link, and the two paths of radio frequency signals are wirelessly transmitted to the distributed unit PRU through an air interface of a transmitting.
And the other path of signals passes through a TDD NR synchronization module, is subjected to analog-to-digital conversion by an integrated transceiver inside the TDD NR synchronization module to form baseband signals, is subjected to FPGA baseband processing to extract a primary synchronization signal PSS and a secondary synchronization signal SSS, demodulate a reference signal DMRS, and demodulate a synchronization signal demodulated by the synchronization module to be used for synchronization between the main unit PAU and a base station, and meanwhile, after the synchronization signal is processed by a logic processor FPGA, one path of signals is used for controlling radio frequency on and off switching of an uplink, and the other path of signals is processed by an OOK modulation module and then transmitted to the distributed unit PRU through an air interface antenna of a main unit PAU transmission link.
Based on any of the above embodiments, step S2 in the method specifically includes:
converting the first radio frequency signal or the second radio frequency signal into an initial high-frequency radio frequency signal after radio frequency mixing, up-conversion and filtering processing of a phase-locked loop, and transmitting the initial high-frequency radio frequency signal to the UE through a built-in omnidirectional antenna after the initial high-frequency radio frequency signal is amplified by a power amplifier and processed by a circulator filter;
receiving an air interface radio frequency signal from the main unit PAU through an air interface antenna, processing the air interface radio frequency signal through a second OOK modulation module and a second synchronization module, and analyzing the air interface radio frequency signal to obtain a first switching signal and a second switching signal of opening and closing uplink and downlink radio frequencies, wherein the first switching signal is used for controlling switching between opening and closing of a second reverse receiving link of the distributed unit PRU, and the second switching signal is used for controlling phase-locked loops of a second forward transmitting link and the second reverse receiving link.
Specifically, the distributed unit PRU front receiving end wirelessly receives radio frequency signals with frequency shift frequencies of F1 and F2 from the main unit PAU air interface, the radio frequency signals at the distributed unit PRU receiving end are converted into high-frequency 5G radio frequency signals through phase-locked loop radio frequency mixing, up-conversion and filtering, the high-frequency 5G radio frequency signals are amplified through a power amplifier, and are transmitted through a built-in omnidirectional antenna after being filtered through a circulator, so that downlink transmission and coverage of thewireless frequency shift 5G signals are realized.
Meanwhile, an air interface radio frequency signal received by the distributed unit PRU through an air interface antenna and sent to the main unit PAU is processed through the OOK module and the TDD NR synchronization module to analyze switching signals for switching on and off uplink radio frequency, one path is used for controlling switching on and off of uplink radio frequency at a receiving end of the distributed unit PRU, and the other path is used for controlling a phase-locked loop of a receiving link and a transmitting link of the distributed unit PRU.
Here, the local oscillator signal realizes up-conversion and down-conversion of the forward transmitting end and the reverse receiving end through a local phase-locked loop of the distributed unit PRU, and the uplink and downlink radio frequency on and off switching signal is used for controlling on and off of the radio frequency of the TDD NR time division uplink and on and off of the local oscillator signal.
Based on any of the above embodiments, step S3 in the method specifically includes:
down-converting the terminal frequency signal to the first radio frequency signal or the second radio frequency signal by the distributed unit PRU;
respectively processing the first radio frequency signal or the second radio frequency signal through a down-conversion low-frequency radio frequency signal filter, a low-noise amplifier and a circulator filter, and transmitting the processed first radio frequency signal or the processed second radio frequency signal through a built-in air interface antenna;
and performing up-conversion on the processed first radio frequency signal or the processed second radio frequency signal through a frequency conversion module to obtain the preset high-frequency signal, and transmitting the preset high-frequency signal back to the base station.
Specifically, the receiving link receives F-frequency signals from the client UE through the distributed unit PRU of the overlay terminal, down-converts the signals to low-frequency radio frequency signals of F1 and F2 through the distributed unit PRU, amplifies the down-converted low-frequency radio frequency signal filter and the low-noise amplifier LNA, and the circulator filter transmits the radio frequency signals of F1 and F2 through the built-in air interface antenna. The main unit PAU reversely receives the radio frequency signals of F1 and F2 transmitted from the distributed unit PRU through a built-in air interface antenna, and after radio frequency filtering and low noise amplification, the radio frequency signals are up-converted into high-frequency radio frequency signals F through a frequency conversion module and transmitted to a base station. Wireless distributed coverage of the coverage area is achieved.
Here, the two rf signals of F1 and F2 are implemented in TDD NR mode, and therefore, the rf signals of F1 and F2 both include uplink signals and downlink signals, and since the frequencies of the receiving and transmitting portions are different and the frequencies of the frequency shift of the two MIMO signals are different, there is no system self-excitation of the rf signals and no mutual crosstalk of the rf signals between system links.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A 5G NR wireless distributed frequency shift system, comprising: a master unit PAU and a distributed unit PRU, wherein:
the main unit PAU is used for receiving a preset high-frequency signal sent by a 5G macro station, converting the preset high-frequency signal into two paths of frequency-shifting radio-frequency signals with different preset low frequencies, sending the two paths of frequency-shifting radio-frequency signals to the distributed unit PRU, receiving a return signal of the distributed unit PRU, converting the return signal into the preset high-frequency signal, and sending the preset high-frequency signal to the 5G macro station;
the distributed unit PRU is used for receiving the two paths of frequency shift radio frequency signals, converting the two paths of frequency shift radio frequency signals into the preset high frequency signals, transmitting the preset high frequency signals to the UE, receiving signals of the UE, shifting the frequency of the signals to the two paths of frequency shift radio frequency signals, and transmitting the two paths of frequency shift radio frequency signals back to the main unit PAU.
2. The 5G NR wireless distributed frequency shift system of claim 1, wherein the master unit PAU is further configured to implement air interface synchronization with the distributed unit PRUs.
3. The 5G NR wireless distributed frequency shift system of claim 1, wherein the master unit PAU comprises a first synchronization module, a first OOK modulation module, a frequency conversion module, a first forward transmit link, and a first reverse receive link, wherein:
the first synchronization module is respectively connected with the frequency conversion module and the radio frequency switch of the first reverse receiving link;
the first OOK modulation module is connected to the first synchronization module and the first forward transmit link, respectively;
the first forward transmitting link and the first reverse receiving link are both used for transmission through a built-in omnidirectional antenna.
4. The 5G NR wireless distributed frequency shift system according to claim 3, wherein the first synchronization module comprises an AD integrated transceiver and an FPGA, the AD integrated transceiver collects the preset high-frequency signal, converts the preset high-frequency signal into a time-domain signal, and the FPGA processes the time-domain signal to analyze a 5G synchronization signal.
5. The 5G NR wireless distributed frequency shift system according to claim 1, wherein the distributed unit PRU comprises a phase locked loop, a second OOK modulation module, a second synchronization module, a second forward transmission link, and a second reverse reception link, wherein:
the second OOK modulation module is respectively connected to a built-in omnidirectional antenna and the second synchronization module, wherein the built-in omnidirectional antenna is used for being connected to the main unit PAU;
the second synchronization module is respectively connected with the second OOK modulation module, the phase-locked loop, and the radio frequency switch of the second reverse receive link.
6. The 5G NR wireless distributed frequency shift system of claim 1, wherein the master unit PAU is connected to a number of distributed units PRU.
7. A frequency shift method based on the 5G NR wireless distributed frequency shift system of any one of claims 1 to 6, comprising:
the method comprises the steps that a main unit PAU receives a preset high-frequency signal of a 5G macro station to obtain a coupled base station signal, and the coupled base station signal is divided into a frequency shift signal and a synchronous signal;
the distributed unit PRU receives the frequency shift signal, completes downlink transmission and coverage of the frequency shift signal, receives the synchronization signal and completes air interface synchronization with the main unit PAU;
the distributed unit PRU receives a terminal frequency signal from UE, converts the terminal frequency signal into a wireless radio frequency signal through down-conversion and transmits the wireless radio frequency signal back to the main unit PAU, and the wireless radio frequency signal is converted into a high-frequency radio frequency signal through up-conversion of the main unit PAU and transmits the high-frequency radio frequency signal back to a base station.
8. The method according to claim 7, wherein the main unit PAU receives a predetermined high frequency signal of a 5G macro station, obtains a coupled base station signal, and divides the coupled base station signal into a frequency shift signal and a synchronization signal, and specifically includes:
the main unit PAU receives the preset high-frequency signal through passive device feeder line coupling, and converts the frequency shift signal into a preset low-frequency band frequency shift radio frequency signal through down-conversion processing of a frequency conversion module;
amplifying the preset low-frequency-band frequency-shift radio-frequency signal through a power amplifier of a transmitting link, processing the preset low-frequency-shift radio-frequency signal by using a loop filter, converting the preset low-frequency-shift radio-frequency signal into a first radio-frequency signal and a second radio-frequency signal, and wirelessly transmitting the first radio-frequency signal and the second radio-frequency signal to the distributed unit PRU through an air interface of a transmitting terminal;
the synchronization signals are converted into baseband signals through an AD integrated transceiver inside a first synchronization module, a main synchronization signal PSS, an auxiliary synchronization signal SSS and a demodulation reference signal DMRS are extracted from the baseband signals through an FPGA, the baseband signals are converted into a first path of synchronization signals and a second path of synchronization signals, the first path of synchronization signals are used for controlling radio frequency of a first forward transmission link to be switched on and off, and the second path of synchronization signals are processed through a first OOK adjusting module and then are wirelessly transmitted to the distributed unit PRU through an air interface of a transmitting end.
9. The method according to claim 8, wherein the distributed unit PRU receives the frequency shift signal, completes downlink transmission and coverage of the frequency shift signal, and receives the synchronization signal, and completes air interface synchronization with the master unit PAU, specifically including:
converting the first radio frequency signal or the second radio frequency signal into an initial high-frequency radio frequency signal after radio frequency mixing, up-conversion and filtering processing of a phase-locked loop, and transmitting the initial high-frequency radio frequency signal to the UE through a built-in omnidirectional antenna after the initial high-frequency radio frequency signal is amplified by a power amplifier and processed by a circulator filter;
receiving an air interface radio frequency signal from the main unit PAU through an air interface antenna, processing the air interface radio frequency signal through a second OOK modulation module and a second synchronization module, and analyzing the air interface radio frequency signal to obtain a first switching signal and a second switching signal of opening and closing uplink and downlink radio frequencies, wherein the first switching signal is used for controlling switching between opening and closing of a second reverse receiving link of the distributed unit PRU, and the second switching signal is used for controlling phase-locked loops of a second forward transmitting link and the second reverse receiving link.
10. The method according to claim 9, wherein the distributed unit PRU receives a terminal frequency signal from the UE, converts the terminal frequency signal into a radio frequency signal by down-conversion and transmits the radio frequency signal back to the main unit PAU, and converts the radio frequency signal into a high frequency radio frequency signal by up-conversion of the main unit PAU and transmits the high frequency radio frequency signal back to the base station, specifically comprising:
down-converting the terminal frequency signal to the first radio frequency signal or the second radio frequency signal by the distributed unit PRU;
respectively processing the first radio frequency signal or the second radio frequency signal through a down-conversion low-frequency radio frequency signal filter, a low-noise amplifier and a circulator filter, and transmitting the processed first radio frequency signal or the processed second radio frequency signal through a built-in air interface antenna;
and performing up-conversion on the processed first radio frequency signal or the processed second radio frequency signal through a frequency conversion module to obtain the preset high-frequency signal, and transmitting the preset high-frequency signal back to the base station.
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