CN114286355B - Active remote unit and indoor coverage system based on same - Google Patents
Active remote unit and indoor coverage system based on same Download PDFInfo
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- CN114286355B CN114286355B CN202111667889.5A CN202111667889A CN114286355B CN 114286355 B CN114286355 B CN 114286355B CN 202111667889 A CN202111667889 A CN 202111667889A CN 114286355 B CN114286355 B CN 114286355B
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Abstract
The invention discloses an active remote unit and an indoor coverage system based on the same, wherein in the active remote unit, a received 2X 2MIMO signal can be remote through a first MIMO channel, a second MIMO channel and a control module, so that signal coverage is completed, an information source uplink and downlink switching signal can be sent to an OOK transmitting module for OOK modulation through the control module, and the active remote unit is monitored and managed through Bluetooth communication, so that the problems of weak coverage and blind coverage in the prior art are solved.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to an active remote unit and an indoor coverage system based on the active remote unit.
Background
4G changes life and 5G changes society. With the continuous advancement of 5G construction, 5G technology has penetrated all aspects of society, profoundly affecting people's life and work patterns. Industry expects that 80% of the traffic will occur in indoor scenarios, so operators' core competence when indoor coverage.
Due to the shielding of buildings, the complexity of urban environment and the high air transmission and penetration loss of 5G frequency band, weak coverage and blind coverage areas exist indoors, such as hotels, office buildings, underground parking lots, elevator shafts, business halls, supermarket venues, KTVs, coffee houses and the like
The main scheme for solving the problems of indoor weak coverage and blind coverage is to adopt a small base station, but the construction of the small base station needs returning resources, the construction difficulty is high, the networking is inflexible, the equipment and construction cost is high, and the investment and income ratio is poor.
Disclosure of Invention
The invention aims to overcome the defects, and provides an active remote unit and an indoor coverage system based on the active remote unit, which solve the problems of weak coverage and blind coverage in the prior art.
In order to achieve the above object, an active remote unit includes a first MIMO channel, a second MIMO channel, and a control module;
the first MIMO channel comprises a first MIMO signal link and an OOK signal link, the first MIMO signal link and the OOK signal link are both connected with a first duplexer, the first duplexer is connected with a first radio frequency connector, the first radio frequency connector is connected with a signal source, the first MIMO signal link and the OOK signal link are both connected with a second duplexer, and the second duplexer is connected with a second radio frequency connector;
the second MIMO channel comprises a second MIMO signal link and a Bluetooth communication link, the second MIMO signal link and the Bluetooth communication link are both connected with a third duplexer, the third duplexer is connected with a third radio frequency connector, the third radio frequency connector is connected with an information source, the second MIMO signal link and the Bluetooth communication link are both connected with a fourth duplexer, and the fourth duplexer is connected with a fourth radio frequency connector;
the OOK signal link and the Bluetooth communication link are both connected with the control module, and the control module is used for sending signals of the information source to the OOK transmitting module for OOK modulation.
The first MIMO signal link comprises a first radio frequency connector, the first radio frequency connector is connected with a first radio frequency feed cable, the first radio frequency feed cable is connected with a first port of a first duplexer, a second port of the first duplexer is connected with a first port of a first power divider, a second port and a third port of the first power divider are respectively connected with a first user access link and a first line loss compensation link, the first user access link is connected with a first MIMO antenna, the first line loss compensation link is connected with a second port of a second duplexer, the first port of the second duplexer is connected with a first port of a fifth switch, the second port of the fifth switch is connected with a second radio frequency feed cable, the third port of the fifth switch is grounded, and the second radio frequency feed cable is connected with a second radio frequency connector;
the first radio frequency feed cable is connected with the first power taking module, and the second radio frequency feed cable is connected with the first feed module and the current detection module.
The first user access link comprises a first switch, a first port of the first switch is connected with a second port of the first two-way power divider, a second port of the first switch is connected with a first downlink user access link, a third port of the first switch is connected with a first uplink user access link, the first downlink user access link is connected with a second port of the second switch, the first uplink user access link is connected with a third port of the second switch, a first port of the second switch is connected with a first band-pass filter, and the first band-pass filter is connected with a first MIMO antenna.
The first line loss compensation link comprises a third switch, a first port of the third switch is connected with a third port of the first two-way power divider, a second port of the third switch is connected with the first downlink line loss compensation link, a third port of the third switch is connected with the first uplink line loss compensation link, the first downlink line loss compensation link is connected with a second port of the fourth switch, the first uplink line loss compensation link is connected with a third port of the fourth switch, and a first port of the fourth switch is connected with a second port of the second duplexer.
The OOK signal link comprises an OOK receiving module, the OOK receiving module is connected with a third port of a second power divider, the second port of the second power divider is connected with a third port of a second duplexer, the first port of the second power divider is connected with a third port of a first duplexer, and the OOK receiving module is connected with a control module.
The second MIMO signal link comprises a third radio frequency connector, the third radio frequency connector is connected with a third radio frequency feed cable, the third radio frequency feed cable is connected with a first port of a third duplexer, the third port of the third duplexer is connected with a first port of a fourth second power divider, the third port of the fourth second power divider and the second port are respectively connected with a second user access link and a second line loss compensation link, the second user access link is connected, the second line loss compensation link is connected with a third port of a fourth duplexer, the first port of the fourth duplexer is connected with a first port of a tenth switch, the second port of the tenth switch is connected with a fourth radio frequency feed cable, the third port of the tenth switch is grounded, and the fourth radio frequency feed cable is connected with a fourth radio frequency connector;
the third radio frequency feed cable is connected with the second power taking module, and the fourth radio frequency feed cable is connected with the second power feeding module.
The second user access link comprises an eighth switch, a first port of the eighth switch is connected with a third port of the fourth power divider, a second port of the eighth switch is connected with a second downlink user access link, a third port of the eighth switch is connected with a second uplink user access link, the second downlink user access link is connected with a second port of the ninth switch, the second uplink user link is connected with a second port of the ninth switch, a first port of the ninth switch is connected with a second band-pass filter, and the second band-pass filter is connected with a second MIMO antenna.
The second line loss compensation link comprises a sixth switch, a first port of the sixth switch is connected with a second port of the fourth power divider, a second port of the sixth switch is connected with a second downlink line loss compensation link, a third port of the sixth switch is connected with a second uplink line loss compensation link, the second downlink line loss compensation link is connected with a second port of the seventh switch, the second uplink line loss compensation link is connected with a third port of the seventh switch, a first port of the seventh switch is connected with a third port of the fourth duplexer, a first port of the fourth duplexer is connected with a first port of the tenth switch, a second port of the tenth switch is connected with a fourth radio frequency feed cable, a third port of the tenth switch is grounded, and the fourth radio frequency feed cable is connected with a fourth radio frequency connector.
The Bluetooth communication link comprises a Bluetooth communication module, the Bluetooth communication module is connected with a second port of a third power divider, the third port of the third power divider is connected with a second port of a fourth duplexer, the first port of the third power divider is connected with a second port of a third duplexer, and the Bluetooth communication module is connected with a control module.
An indoor coverage system based on an active remote unit comprises a feed access unit and a plurality of active remote units, wherein the feed access unit is connected with a signal source, the feed access unit is connected with a power supply unit, an output joint of the feed access unit is connected with the plurality of active remote units in series, and all signals are grounded in a final active remote unit.
Compared with the prior art, in the active remote unit, the received 2×2MIMO signal can be remote through the first MIMO channel, the second MIMO channel and the control module, so that signal coverage is completed, the control module can send the uplink and downlink switching signals of the information source to the OOK transmitting module to perform OOK modulation, and the active remote unit is monitored and managed through bluetooth communication, so that the problems of weak coverage and blind coverage in the prior art are solved.
In the indoor coverage system, a feed access unit is connected with a signal source, the feed access unit is connected with a power supply unit, an output joint of the feed access unit is connected with a plurality of active remote units in series, and all signals are grounded in a final active remote unit. The flexibility of networking is improved, the construction difficulty is reduced, and the investment and income ratio of networking is improved. All signals in the final-stage active remote unit are grounded, and signal leakage can be placed.
Drawings
FIG. 1 is a system diagram of an active remote unit according to the present invention;
FIG. 2 is a system diagram of an indoor coverage system according to the present invention;
fig. 3 is a system diagram of a feed access unit in an embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, an active remote unit is responsible for an access unit and feeds, and can provide 2×2MIMO signal coverage by means of an external antenna, and can provide cascading of one path of active remote units, and can also provide-48V power for the cascading active remote units by means of radio frequency feed cable feeding.
An active remote unit includes a MIMO1 channel, a second MIMO channel, and a control module.
The MIMO1 channel comprises a MIMO1 signal link, an OOK signal link, a 48V RTN circuit, a 48V RTN feed circuit and a current detection circuit, and mainly realizes the following functions:
1) User access link: amplifying and filtering the first MIMO uplink and downlink signals, namely amplifying and filtering the accessed first MIMO signals in the downlink direction, and providing signal coverage through antenna radiation; and the uplink direction sends the accessed terminal signals to the feed access unit after amplification and filtering treatment.
2) Line loss compensation link: and compensating the feed cable loss of the first MIMO signal between the feed access unit and the active remote unit, so that the active remote unit can be cascaded with the next active remote unit, and the line loss compensation is simultaneously compensated in the downlink and the uplink.
3) The OOK signal is received from the feed cable and is demodulated and used as a control signal for switching the self switch up and down.
4) And separating the OOK signals in the feed cable to form one OOK signal, and feeding the OOK signal into the radio frequency feed cable so as to provide the OOK signal for the next active remote unit.
5) take-out-48V RTN: -48V RTN is taken out of the accessed radio frequency feed.
6) feed-48V RTN: -48V RTN is fed into the radio frequency feed to power the next stage active remote unit.
7) The current detection module is used for respectively carrying out current detection on the two paths of radio frequency feed cables, and when no current is detected, the switch is switched to a grounding mode so as to prevent the first MIMO signal and the OOK signal from leaking outwards.
The connection relation between each device and module of the first MIMO signal link is as follows:
the first MIMO signal link of the first MIMO channel includes a first radio frequency connector, the first radio frequency connector is connected to a first radio frequency feed cable, the first radio frequency feed cable is connected to a first port of the first duplexer, a second port of the first duplexer is connected to a first port of the first power divider, and the first power divider is connected to the user access link and the line loss compensation link, respectively, as described below.
When the first two-power divider is connected with the user access link, the second port of the first power divider is connected with the first port of the first switch, the second port of the first switch is connected with the first downlink user access link, the third port of the first switch is connected with the first uplink user access link, the first downlink user access link is connected with the second port of the second switch, the first uplink user access link is connected with the third port of the second switch, the first port of the second switch is connected with the first band-pass filter, and the first band-pass filter is connected with the first MIMO antenna.
The first two-way branch is connected with the line loss compensation link, the third port of the first two-way branch is connected with the first port of the third switch, the second port of the third switch is connected with the first downlink line loss compensation link, the third port of the third switch is connected with the first uplink line loss compensation link, the first downlink line loss compensation link is connected with the second port of the fourth switch, the first port of the fourth switch is connected with the second port of the second duplexer, the first port of the second duplexer is connected with the first port of the fifth switch, the second port of the fifth switch is connected with the second radio frequency feed cable, the third port of the fifth switch is grounded, and the second radio frequency feed cable is connected with the second radio frequency connector.
The functions of the devices and modules of the first MIMO signal link are described as follows:
the first radio frequency connector is in butt joint with the feed access unit through a radio frequency feed cable.
The first duplexer realizes the branching or combining of the first MIMO signal and the OOK signal.
The first two-way divider realizes the power distribution or synthesis of the first MIMO signal, namely, the power of the first MIMO signal is equally divided into a user access link and a line loss compensation link in the downlink direction; and in the uplink direction, carrying out power synthesis on the first MIMO signal of the user access link and the first MIMO signal of the line loss compensation link.
The first switch realizes the switching of uplink and downlink signals of a user access link.
The first downlink user access link realizes the amplification and filtering processing of the downlink first MMO signal.
The first uplink user access link realizes the amplification and filtering processing of the uplink first MIMO signal.
And the second switch realizes the switching of uplink and downlink signals of the user access link.
The first band-pass filter implements channel filtering and out-of-band rejection of the first MIMO signal.
And the third switch realizes the switching of the uplink and downlink signals of the line loss compensation link.
The first downlink loss compensation link implements amplification filtering processing of the downlink first MIMO signal.
The first uplink loss compensation link implements amplification filtering processing of the uplink first MIMO signal.
The fourth switch realizes the switching of the uplink and downlink signals of the line loss compensation link.
The second diplexer achieves separation or combination of the first MIMO signal and the OOK signal.
The fifth switch realizes the output or closing function of the first MIMO signal and the OOK signal after the combination of the diplexer, and is matched with the current detection, namely, when the current detection module detects that the current exists in the radio frequency feed cable, the switch is switched to a signal output path; when the current detection module detects no current in the radio frequency feed cable, the switch is switched to a grounding state so as to prevent the first MIMO from leaking outwards.
The connection relation between each device and module of the OOK signal link is described as follows:
the OOK signal link of the first MIMO channel comprises a first radio frequency connector, the first radio frequency connector is connected with a first radio frequency feed cable, the first radio frequency feed cable is connected with a third port of the first duplexer, the port of the first duplexer is connected with a first port of the second power divider, the second port of the second power divider is connected with a third port of the second duplexer, the first port of the second duplexer is connected with a first port of the fifth switch, the second port of the fifth switch is connected with a second radio frequency feed cable, the third port of the fifth switch is grounded, the second radio frequency feed cable is connected with a second radio frequency connector, the third port of the second power divider is connected with an OOK receiving module, and the OOK receiving module is connected with a control module.
The functions of the devices and modules of the OOK signal link are illustrated as follows:
the first radio frequency connector is in butt joint with the feed access unit or the upper active remote unit through a radio frequency feed cable.
The first duplexer realizes the branching or combining of the first MIMO signal and the OOK signal.
The second power divider realizes the distribution or synthesis of the OOK signal power, namely the OOK signal power is divided into two paths, one path is connected to the OOK receiving module, and the other path is connected to the second duplexer so as to provide the OOK signal for the next-stage active remote unit.
The second diplexer achieves the combining of the OOK signal and the first MIMO signal.
The fifth switch realizes the output or closing function of the MIMO1 signal and the OOK signal after the combination of the diplexer, and is matched with current detection for use, namely, when the current detection module detects that the current exists in the radio frequency feed cable, the switch is switched to a signal output path; when the current detection module detects no current in the radio frequency feed cable, the switch is switched to a grounding state so as to prevent OOK from leaking outwards.
The connection relation between each device and module of the 48V RTN circuit is described as follows:
the-48V RTN power taking circuit of the MIMO1 channel comprises a first radio frequency connector, an outer conductor of the first radio frequency connector is grounded, the first radio frequency connector is connected with a radio frequency feed cable, and an inner conductor of the first radio frequency feed cable is connected with a first power taking module.
The function of the devices and modules of the 48V RTN fetch circuit is described as follows:
the first radio frequency connector is in butt joint with the feed access unit through a radio frequency feed cable, and the outer conductor of the radio frequency connector is grounded.
The first radio frequency feed implements a-48V RTN transmission.
The first power taking module is used for taking-48V RTN out of the radio frequency feed cable.
The connection between the components and the modules of the 48V RTN feed circuit is described as follows:
the-48V RTN feed circuit of the first MIMO channel comprises a first feed module, wherein the first feed module is connected with an inner conductor of a second radio frequency feed cable, the second radio frequency feed cable is connected with a second radio frequency connector, and an outer conductor of the second radio frequency connector is grounded.
The current detection circuit of the first MIMO channel comprises a current detection module, and the current detection module is connected with the inner conductor of the second radio frequency feed cable.
The function of the various devices and modules of the 48V RTN feed circuit is explained as follows:
the first feeding module enables feeding-48V RTN into the radio frequency feed cable.
The second radio frequency feed enables-48V RTN transmission.
The second radio frequency connector is in butt joint with the next-stage active remote unit through a radio frequency feed cable.
The connection relation between each device and module of the current detection circuit is described as follows:
the current detection of the first MIMO channel comprises current detection modules which are respectively connected with the second radio frequency feed cable.
The functions of the devices and modules of the current detection circuit are described as follows:
the current detection module realizes a current detection function in the radio frequency feed cable.
The second MIMO channel comprises a second MIMO signal link, a Bluetooth communication link, a-48V power taking circuit and a-48V feeding circuit, and mainly realizes the following functions:
1) User access link: amplifying and filtering the second MIMO uplink and downlink signals, namely amplifying and filtering the accessed second MIMO signals in the downlink direction, and providing signal coverage through antenna radiation; and the uplink direction sends the accessed terminal signals to the feed access unit after amplification and filtering treatment.
2) Line loss compensation link: and compensating the feed cable loss of the second MIMO signal between the feed access unit and the active remote unit, so that the active remote unit can be cascaded with the next active remote unit, and the line loss compensation is simultaneously compensated in the downlink and the uplink.
3) And Bluetooth signals are received from the feed cable, so that communication with the feed access unit or the upper active remote unit is realized.
4) And separating a Bluetooth signal in the feed cable to feed the Bluetooth signal into the radio frequency feed cable so as to communicate with the next active remote unit.
5) take-out-48V: -48V is removed from the accessed rf feed.
6) feed-48V: -48V is fed into the rf feed to power the next stage active remote unit.
The connection relationship between each device and module of the second MIMO signal link is described as follows:
the second MIMO signal link of the second MIMO channel includes a third radio frequency connector, where the third radio frequency connector is connected to a third radio frequency feed cable, the third radio frequency feed cable is connected to a first port of a third duplexer, the third port of the third duplexer is connected to a first port of a fourth power divider, and the fourth power divider is connected to the second user access link and the second line loss compensation link, respectively, as described below.
The fourth power divider is connected with the second user access link, and comprises a third port of the fourth power divider connected with a first port of an eighth switch, a second port of the eighth switch is connected with a second downlink user access link, a third port of the eighth switch is connected with a second uplink user access link, the second downlink user access link is connected with a second port of a ninth switch, the second uplink user link is connected with a third port of the ninth switch, the first port of the ninth switch is connected with a second band-pass filter, and the second band-pass filter is connected with a second MIMO antenna.
The fourth power divider is connected with the second line loss compensation link, and comprises a second port of the fourth power divider connected with a first port of a sixth switch, a second port of the sixth switch is connected with a second downlink line loss compensation link, a third port of the sixth switch is connected with a second uplink line loss compensation link, the second downlink line loss compensation link is connected with a second port of a seventh switch, the second uplink line loss compensation link is connected with a third port of the seventh switch, a first port of the seventh switch is connected with a third port of a fourth duplexer, a first port of the fourth duplexer is connected with a first port of a tenth switch, a second port of the tenth switch is connected with a fourth radio frequency feed cable, a third port of the tenth switch is grounded, and the fourth radio frequency feed cable is connected with a fourth radio frequency connector.
The functions of the devices and modules of the second MIMO signal link are described as follows:
the third radio frequency connector is in butt joint with the feed access unit or the upper active remote unit through a radio frequency feed cable.
The third duplexer realizes the branching or combining of the second MIMO signal and the bluetooth signal.
The fourth power divider realizes the power distribution or synthesis of the second MIMO signal, namely, the power of the second MIMO signal is equally divided into a user access link and a line loss compensation link in the downlink direction; and in the uplink direction, carrying out power synthesis on the second MIMO signal of the user access link and the second MIMO signal of the line loss compensation link.
And the eighth switch realizes the switching of the uplink and downlink signals of the user access link.
The second downlink user access link realizes the amplification and filtering processing of the downlink second MMO signal.
The second uplink user access link realizes the amplification and filtering processing of the uplink second MIMO signal.
And the ninth switch realizes the switching of uplink and downlink signals of the user access link.
The second band-pass filter realizes channel filtering and out-of-band rejection of the second MIMO signal.
The sixth switch realizes the switching of the uplink and downlink signals of the line loss compensation link.
The second downlink loss compensation link implements amplification filtering processing of the downlink second MIMO signal.
The second uplink loss compensation link implements amplification filtering processing of the second MIMO signal on the uplink.
The seventh switch realizes the switching of the uplink and downlink signals of the line loss compensation link.
The fourth duplexer realizes separation or combination of the second MIMO signal and the bluetooth signal.
The tenth switch realizes the output or closing function of the second MIMO signal and the Bluetooth signal after the combination of the diplexer, and is matched with the current detection, namely, when the current detection module detects that the current exists in the radio frequency feed cable, the switch is switched to a signal output path; when the current detection module detects no current in the radio frequency feed cable, the switch is switched to a grounding state so as to prevent the second MIMO from leaking outwards.
The connection relation between each device and module of the Bluetooth communication link is described as follows:
the second MIMO channel Bluetooth communication link comprises a third radio frequency connector, the third radio frequency connector is connected with a third radio frequency feed cable, the third radio frequency feed cable is connected with a first port of a third duplexer, a second port of the third duplexer is connected with a first port of a third second power divider, a second port of the third second power divider is connected with a Bluetooth communication module, and the Bluetooth communication module is connected with a control module; the third port of the third second power divider is connected with the second port of the fourth duplexer, the first port of the fourth duplexer is connected with the first port of the tenth switch, the second port of the tenth switch is connected with the fourth radio frequency feed cable, the third port of the tenth switch is grounded, and the fourth radio frequency feed cable is connected with the fourth radio frequency connector.
The functions of the various devices and modules of the bluetooth communication link are described as follows:
the third radio frequency connector is in butt joint with the feed access unit or the upper active remote unit through a radio frequency feed cable.
The third duplexer realizes the branching or combining of the second MIMO signal and the bluetooth signal.
The third power divider realizes the power division or synthesis of the Bluetooth signals, namely the Bluetooth signals are divided into two paths in the downlink direction, and one path is sent to the Bluetooth communication module; the other path is fed into the remote link through a fourth duplexer so as to realize communication with the remote unit at the next stage.
The Bluetooth communication module is used for communicating with the feed access unit.
The fourth duplexer realizes separation or combination of the second MIMO signal and the bluetooth signal.
The tenth switch realizes the output or closing function of the second MIMO signal and the Bluetooth signal after the combination of the diplexer, and is matched with the current detection, namely, when the current detection module detects that the current exists in the radio frequency feed cable, the switch is switched to a signal output path; when the current detection module detects no current in the radio frequency feed cable, the switch is switched to a grounding state so as to prevent Bluetooth signals from leaking outwards.
The connection relationship between each device and module of the-48V power take-off circuit is described as follows:
the-48V power taking circuit of the second MIMO channel comprises a third radio frequency connector, an outer conductor of the third radio frequency connector is grounded, the third radio frequency connector is connected with a third radio frequency feed cable, and an inner conductor of the third radio frequency feed cable is connected with the second power taking module.
The function of the devices and modules of the 48V pick-up circuit is described as follows:
the third radio frequency connector is in butt joint with the upper stage through a radio frequency feed cable.
The third rf feed achieves-48V transmission.
The second power take-off module achieves-48V take-off from the radio frequency feed.
The connection between the components and the modules of the 48V feed circuit is described as follows:
the-48V feed circuit of the second MIMO channel comprises a second feed module, the second feed module is connected with an inner conductor of a fourth radio frequency feed cable, the fourth radio frequency feed cable is connected with a radio frequency fourth radio frequency connector, and an outer conductor of the fourth radio frequency connector is grounded.
The function of the various devices and modules of the 48V feed circuit is explained as follows:
the second feed module enables-48V to be fed into the radio frequency feed.
The fourth rf feed achieves-48V transmission.
The fourth radio frequency connector is connected with the next stage through a radio frequency feed cable.
The control module is respectively connected with the OOK receiving module and the Bluetooth communication module.
Referring to fig. 2, to better illustrate such a system, the present embodiment provides an indoor coverage system supporting a 2-way 3-stage cascade.
An indoor coverage system comprises 1 feed access unit, 6 active remote units and 1 power supply unit, and can provide 7-point 2×2MIMO signal coverage.
The feed access unit is in butt joint with the information source, can provide 2 paths of signal access, can provide 2X 2MIMO signal coverage after amplification and filtering processing, and can provide two paths of 2X 2MIMO signals to be far away.
The 6 active remote units can provide 2×2MIMO signal coverage and one path of 2×2MIMO signal remote.
The 6 active remote units are cascaded into two paths, wherein each path of active remote units is cascaded with 3 stages of active remote units, and the specific cascading relationship is as follows:
one path of 3-stage cascade relation:
one-stage first remote unit 1-1 is connected with one-way MIMO1 and MIMO2 port of the feed access unit, one-stage second remote unit 1-2 is connected with one-stage first remote unit 1-1, one-stage third remote unit 1-3 is connected with first second remote unit 1-2
The cascade port of the first-stage third remote unit 1-3 is grounded through a built-in switch so as to avoid signal leakage.
The other 3-stage cascade relation:
the second-stage first remote unit 2-1 is connected with a first MIMO port and a second MIMO port of the feed access unit, the second-stage second remote unit 2-2 is connected with the second-stage first remote unit 2-1, and the second-stage third remote unit 2-3 is connected with the second-stage second remote unit 2-2.
The cascade port of the second-stage third remote unit 2-3 is grounded through a built-in switch so as to avoid signal leakage.
The access unit is powered by the power supply unit.
The access unit provides-48V power to the cascaded remote units via the rf feed.
The upper stage remote units provide-48V power for the lower stage remote units through the radio frequency feed cable.
The access unit outputs an information source uplink and downlink switch OOK signal to each level of remote units, and each level of remote units acquires the uplink and downlink switch signal by demodulating the OOK signal.
The cascade remote units communicate with the access units through Bluetooth, and the communication mode adopts a master-slave mode, wherein the Bluetooth modules of the access units are the master, and the Bluetooth modules of the cascade remote units are the slaves.
The access unit is connected with the remote unit through a radio frequency feed cable.
The remote units are connected with the cascade remote units through radio frequency feed cables.
Referring to fig. 3, a feed access unit includes a first MIMO channel, a second MIMO channel, and a control module;
the first MIMO channel comprises a first MIMO signal link, the first MIMO signal link is used for receiving input signals, the first MIMO signal link is connected with an OOK signal link, the first MIMO signal link and the OOK signal link are respectively connected with corresponding output connectors through a first radio frequency feed cable and a second radio frequency feed cable, and the first radio frequency feed cable and the second radio frequency feed cable are both connected with a-48 VRTN feed circuit and a current detection circuit;
the second MIMO channel comprises a second MIMO signal link, the second MIMO signal link is used for receiving input signals, the second MIMO signal link is connected with a Bluetooth communication link, the second MIMO signal link and the Bluetooth communication link are respectively connected with corresponding output connectors through a third radio frequency feed cable and a fourth radio frequency feed cable, and the third radio frequency feed cable and the fourth radio frequency feed cable are connected with a-48V feed circuit;
the OOK signal link and the Bluetooth communication link are both connected with the control module, and the control module is used for sending the uplink and downlink switching signals of the information source to the OOK transmitting module for OOK modulation, and monitoring and managing the active remote units through Bluetooth communication.
The first MIMO signal link comprises a first band-pass filter, the first band-pass filter is used for receiving input signals, the first band-pass filter is connected with a first port of a first switch, a second port of the first switch is connected with a first downlink amplification filter radio frequency link, a third port of the first switch is connected with a first uplink amplification filter radio frequency link, the first downlink amplification filter radio frequency link is connected with a second port of a second switch, the first port of the second switch is connected with the second band-pass filter, the second band-pass filter is connected with an input port of a first coupler, a first MIMO antenna is connected with an output port of the first coupler, a coupling port of the first coupler is connected with a third band-pass filter, the third band-pass filter is connected with a first port of a first bridge, a third port of the first bridge is connected with a first port of a third switch, a second port of the third switch is connected with a first radio frequency feed cable, a first radio frequency connector is connected with a third port of the third switch, a third port of the third switch is grounded, a fourth port of the fourth switch is connected with a fourth radio frequency feed cable, and a fourth port of the fourth switch is connected with a fourth radio frequency feed cable.
The OOK signal link comprises an OOK transmitting module, the OOK transmitting module is connected with a second port of the first bridge, a third port of the first bridge is connected with a first port of the third switch, the second port of the third switch is connected with the first radio frequency feed cable, the first radio frequency feed cable is connected with the first radio frequency connector, the third port of the third switch is grounded, a fourth port of the first bridge is connected with a first port of the fourth switch, a second port of the fourth switch is connected with the second radio frequency feed cable, the second radio frequency feed cable is connected with the second radio frequency connector, and the third port of the fourth switch is grounded.
-48V RTN feed circuit comprising a first feed module connected to a first radio frequency feed cable and a second radio frequency feed cable, respectively, the first radio frequency feed cable being connected to a first radio frequency connector, the first radio frequency connector outer conductor being grounded; the second radio frequency feed cable is connected with the second radio frequency connector, and the outer conductor of the second radio frequency connector is grounded.
The second MIMO channel comprises a fourth band-pass filter, the fourth band-pass filter is connected with a first port of a fifth switch, a second port of the fifth switch is connected with a second downlink amplification filter radio frequency link, a third port of the fifth switch is connected with a second uplink amplification filter radio frequency link, a second downlink user access link is connected with a second port of a sixth switch, a second uplink user access link is connected with a third port of the sixth switch, a first port of the sixth switch is connected with the fifth band-pass filter, the fifth band-pass filter is connected with an input port of a second coupler, an output port of the second coupler is connected with a second MIMO antenna, a coupling port of the second coupler is connected with a sixth band-pass filter, the sixth band-pass filter is connected with a second port of a second bridge, a third port of the second bridge is connected with a first port of a seventh switch, a second port of the seventh switch is connected with a third radio frequency feed cable, a third port of the seventh switch is grounded, a fourth port of the third bridge is connected with a third radio frequency connector, a fourth port of the second switch is connected with a fourth port of the eighth switch, and a fourth port of the fourth switch is connected with a fourth radio frequency feed.
The Bluetooth communication link comprises a Bluetooth communication module, the Bluetooth communication module is connected with a first port of a second bridge, a third port of the second bridge is connected with a first port of a seventh switch, a second port of the seventh switch is connected with a third radio frequency feed cable, a third electric port of the seventh switch is grounded, the third radio frequency feed cable is connected with a third radio frequency connector, a fourth port of the second bridge is connected with a first port of an eighth switch, a second port of the eighth switch is connected with a fourth radio frequency feed cable, the fourth radio frequency feed cable is connected with a fourth radio frequency connector, and a third port of the eighth switch is grounded.
The 48V feed circuit comprises a second feed module, the second feed module is respectively connected with a third radio frequency feed cable and a fourth radio frequency feed cable, the third radio frequency feed cable is connected with a third radio frequency connector, an outer conductor of the third radio frequency connector is grounded, the fourth radio frequency feed cable is connected with a fourth radio frequency connector, and the outer conductor of the fourth radio frequency connector is grounded.
Claims (8)
1. The active remote unit is characterized by comprising a first MIMO channel, a second MIMO channel and a control module;
the first MIMO channel comprises a first MIMO signal link and an OOK signal link, the first MIMO signal link and the OOK signal link are both connected with a first duplexer, the first duplexer is connected with a first radio frequency connector, the first radio frequency connector is connected with a signal source, the first MIMO signal link and the OOK signal link are both connected with a second duplexer, and the second duplexer is connected with a second radio frequency connector;
the second MIMO channel comprises a second MIMO signal link and a Bluetooth communication link, the second MIMO signal link and the Bluetooth communication link are both connected with a third duplexer, the third duplexer is connected with a third radio frequency connector, the third radio frequency connector is connected with an information source, the second MIMO signal link and the Bluetooth communication link are both connected with a fourth duplexer, and the fourth duplexer is connected with a fourth radio frequency connector;
the OOK signal link and the Bluetooth communication link are both connected with the control module, and the control module is used for sending signals of the information source to the OOK transmitting module for OOK modulation;
the first MIMO signal link comprises a first radio frequency connector, the first radio frequency connector is connected with a first radio frequency feed cable, the first radio frequency feed cable is connected with a first port of a first duplexer, a second port of the first duplexer is connected with a first port of a first power divider, a second port and a third port of the first power divider are respectively connected with a first user access link and a first line loss compensation link, the first user access link is connected with a first MIMO antenna, the first line loss compensation link is connected with a second port of a second duplexer, the first port of the second duplexer is connected with a first port of a fifth switch, the second port of the fifth switch is connected with a second radio frequency feed cable, the third port of the fifth switch is grounded, and the second radio frequency feed cable is connected with a second radio frequency connector;
the first radio frequency feed cable is connected with the first power taking module, and the second radio frequency feed cable is connected with the first feed module and the current detection module;
the second MIMO signal link comprises a third radio frequency connector, the third radio frequency connector is connected with a third radio frequency feed cable, the third radio frequency feed cable is connected with a first port of a third duplexer, the third port of the third duplexer is connected with a first port of a fourth second power divider, the third port of the fourth second power divider and the second port are respectively connected with a second user access link and a second line loss compensation link, the second user access link is connected, the second line loss compensation link is connected with a third port of a fourth duplexer, the first port of the fourth duplexer is connected with a first port of a tenth switch, the second port of the tenth switch is connected with a fourth radio frequency feed cable, the third port of the tenth switch is grounded, and the fourth radio frequency feed cable is connected with a fourth radio frequency connector;
the third radio frequency feed cable is connected with the second power taking module, and the fourth radio frequency feed cable is connected with the second power feeding module.
2. The active remote unit of claim 1, wherein the first subscriber access link comprises a first switch, the first port of the first switch is coupled to the second port of the first two-way power divider, the second port of the first switch is coupled to the first downlink subscriber access link, the third port of the first switch is coupled to the first uplink subscriber access link, the first downlink subscriber access link is coupled to the second port of the second switch, the first uplink subscriber access link is coupled to the third port of the second switch, the first port of the second switch is coupled to the first bandpass filter, and the first bandpass filter is coupled to the first MIMO antenna.
3. The active remote unit of claim 1, wherein the first line loss compensation link comprises a third switch, a first port of the third switch is coupled to the third port of the first two power branches, a second port of the third switch is coupled to the first downlink loss compensation link, a third port of the third switch is coupled to the first uplink loss compensation link, the first downlink loss compensation link is coupled to the second port of the fourth switch, the first uplink loss compensation link is coupled to the third port of the fourth switch, and the first port of the fourth switch is coupled to the second port of the second diplexer.
4. The active remote unit of claim 1, wherein the OOK signal link includes an OOK receiving module, the OOK receiving module being coupled to a third port of the second power divider, the second port of the second power divider being coupled to a third port of the second diplexer, the first port of the second power divider being coupled to a third port of the first diplexer, the OOK receiving module being coupled to the control module.
5. The active remote unit of claim 1, wherein the second subscriber access link comprises an eighth switch, a first port of the eighth switch is connected to the third port of the fourth power division, a second port of the eighth switch is connected to the second downlink subscriber access link, a third port of the eighth switch is connected to the second uplink subscriber access link, a second downlink subscriber access link is connected to the second port of the ninth switch, a second uplink subscriber link is connected to the second port of the ninth switch, a first port of the ninth switch is connected to the second bandpass filter, and the second bandpass filter is connected to the second MIMO antenna.
6. The active remote unit of claim 1, wherein the second line loss compensation link comprises a sixth switch, a first port of the sixth switch is connected to the second port of the fourth power division, a second port of the sixth switch is connected to the second downlink line loss compensation link, a third port of the sixth switch is connected to the second uplink line loss compensation link, the second downlink line loss compensation link is connected to the second port of the seventh switch, the second uplink line loss compensation link is connected to the third port of the seventh switch, a first port of the seventh switch is connected to the third port of the fourth duplexer, a first port of the fourth duplexer is connected to the first port of the tenth switch, a second port of the tenth switch is connected to the fourth rf feed, a third port of the tenth switch is grounded, and the fourth rf feed is connected to the fourth rf connector.
7. The active remote unit of claim 1, wherein the bluetooth communication link comprises a bluetooth communication module, the bluetooth communication module is coupled to the second port of the third power divider, the third port of the third power divider is coupled to the second port of the fourth diplexer, the first port of the third power divider is coupled to the second port of the third diplexer, and the bluetooth communication module is coupled to the control module.
8. An indoor coverage system based on an active remote unit as claimed in claim 1, comprising a feed access unit and a plurality of active remote units, the feed access unit being connected to a source, the feed access unit being connected to a power supply unit, the output connector of the feed access unit being connected in series with the plurality of active remote units, the last active remote unit connecting all signals to ground.
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