CN106374982B - Signal transmission method and system - Google Patents
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- 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
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- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
- H04B1/126—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means having multiple inputs, e.g. auxiliary antenna for receiving interfering signal
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- 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
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Abstract
The invention discloses a signal transmission method, which comprises the following steps: the signal source unit is used for carrying out frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals, and the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit through a five-class line; performing level amplification supplementary adaptation processing on the two paths of first mixed intermediate-frequency signals by using the extension unit to obtain two paths of second mixed intermediate-frequency signals after adaptation processing; transmitting the two paths of second mixed intermediate frequency signals to the remote unit through a five-class line; amplifying and filtering the two paths of second mixed intermediate-frequency signals through the remote unit to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; and the two downlink radio frequency signals are radiated and covered by two external connecting antennas.
Description
Technical Field
The present invention relates to data transmission technologies in the field of wireless communications, and in particular, to a signal transmission method and system.
Background
With the rapid development of wireless communication technology, mobile communication networks are continuously extending to remote areas such as rural areas, cellular planning in cities is smaller and smaller, and base station positions are lower and lower, so that communication requirements of a large number of local areas cannot be met. For example, areas such as shadow areas of high buildings, middle and upper parts of high buildings, lower floors of dense cells, remote areas, special electromagnetic shielding scenes and the like have the problem of poor communication requirements.
To solve the above problems in the network, microsampler systems have come to work. The micro amplifier system guides the base station signal to the indoor area through the outdoor antenna, amplifies, filters and retransmits the base station signal, and simultaneously amplifies, compensates and retransmits the user mobile phone signal to the base station, thereby completing the up-down communication and greatly improving the effective utilization rate of the base station.
The micro amplifier system is internally provided with common Ethernet cables such as a five-type wire or a super five-type wire and the like for digital and analog signal transmission, the Ethernet cables are coated with a high-quality insulating material by increasing the winding density, the transmission rate can reach 100MHz, and the micro amplifier system is suitable for voice transmission and data transmission with the highest transmission rate of 1000 Mbps. Typically, the Ethernet cable is primarily used for 100BASE-T and 10BASE-T networks.
however, although the conventional micro amplifier system uses five types of lines for signal transmission, it only transmits a single signal, and is not suitable for a high-speed network based on a long Term Evolution (L ong Term Evolution, L TE) technology, and cannot support a 2 × 2 Multiple Input Multiple Output (MIMO) technology, which easily causes waste of base station resources and insufficient transmission bandwidth.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a signal transmission method and system to solve the problems in the prior art.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
The embodiment of the invention provides a signal transmission method, which is applied to a signal transmission system comprising a signal source unit, an extension unit and a remote unit; the method comprises the following steps:
The signal source unit is used for carrying out frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals, and the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit through a five-class line;
Performing level amplification supplementary adaptation processing on the two paths of first mixed intermediate-frequency signals by using the extension unit to obtain two paths of second mixed intermediate-frequency signals after adaptation processing; transmitting the two paths of second mixed intermediate frequency signals to the remote unit through a five-class line;
Amplifying and filtering the two paths of second mixed intermediate-frequency signals through the remote unit to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; and the two downlink radio frequency signals are radiated and covered by two external connecting antennas.
In the above scheme, the utilizing the extension unit to perform level amplification supplementary adaptation processing on the two first mixed intermediate frequency signals to obtain two second mixed intermediate frequency signals after the adaptation processing, and transmitting the two second mixed intermediate frequency signals to the remote unit through a five-class line includes:
Receiving two paths of radio frequency signals through two paths of external antennas;
Amplifying and filtering the two paths of radio frequency signals to obtain two paths of filtered radio frequency signals;
Respectively carrying out frequency mixing processing on the two filtered radio frequency signals to obtain two first mixed intermediate frequency signals;
And combining the two paths of first mixed intermediate-frequency signals and transmitting the combined signals to the extension unit through a five-class line.
In the above scheme, the two first mixed intermediate frequency signals are respectively located at different intermediate frequency bands.
In the above solution, the source unit, the extension unit, and the remote unit are all powered by active ethernet POE.
In the above scheme, the five types of wires include four twisted pairs; wherein,
Transmitting the two first mixed intermediate-frequency signals and the two second mixed intermediate-frequency signals through two pairs of twisted pairs; transmitting a local oscillator synchronization signal through a pair of twisted pair lines; the network synchronization signal is transmitted over another twisted pair.
In the above scheme, the method further comprises:
Receiving two paths of uplink feedback signals from a terminal through the remote unit; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals; transmitting the two paths of filtered uplink feedback signals to the extension unit through a five-class line;
Performing level amplification supplementary adaptation processing on the two filtered uplink feedback signals through the extension unit to obtain two adapted uplink feedback signals; transmitting the two adaptive uplink feedback signals to the information source unit through a five-class line;
Performing demixing processing on the two adaptive uplink feedback signals through the information source unit to obtain two demixed uplink feedback signals; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
The embodiment of the invention also provides a signal transmission system, which comprises a signal source unit, an extension unit and a remote unit;
The signal source unit is used for carrying out frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals; combining the two paths of first mixed intermediate-frequency signals and transmitting the combined signals to the extension unit through a five-class line;
The extension unit is used for carrying out level amplification supplementary adaptation processing on the two paths of first mixed intermediate-frequency signals to obtain two paths of second mixed intermediate-frequency signals after adaptation processing; transmitting the two paths of second mixed intermediate frequency signals to the remote unit through a five-class line;
The far-end unit is used for amplifying and filtering the two paths of second mixed intermediate-frequency signals to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; and the two downlink radio frequency signals are radiated and covered by two external connecting antennas.
In the above scheme, the signal source unit is externally connected with two paths of antennas; the signal source unit comprises a receiving end, two amplifying and filtering circuits, two mixers corresponding to the two amplifying and filtering circuits, and a branching and combining device;
The receiving end is used for receiving two paths of radio frequency signals through two paths of external antennas;
The two paths of amplifying and filtering circuits are used for amplifying and filtering the two paths of radio frequency signals received by the receiving end to obtain two paths of filtered radio frequency signals;
The frequency mixer is used for respectively carrying out frequency mixing processing on the two filtered radio frequency signals to obtain two first mixed intermediate frequency signals;
And the combiner is used for combining the two paths of first mixed intermediate-frequency signals and then transmitting the combined signals to the extension unit through a five-class line.
In the above solution, the source unit, the extension unit, and the remote unit are all powered by active ethernet POE.
In the above scheme, the remote unit is further configured to receive two uplink feedback signals from the terminal through two external antennas; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals; transmitting the two paths of filtered uplink feedback signals to the extension unit through a five-class line;
The extension unit is further configured to perform level amplification supplementary adaptation processing on the two filtered uplink feedback signals to obtain two adapted uplink feedback signals; transmitting the two adaptive uplink feedback signals to the information source unit through a five-class line;
The signal source unit is also used for performing demixing processing on the two paths of uplink feedback signals after the adaptation processing to obtain two paths of uplink feedback signals after the demixing processing; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
according to the signal transmission method and the system provided by the embodiment of the invention, the two received radio frequency signals are subjected to frequency mixing processing through the information source unit to obtain two first mixed intermediate frequency signals, the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit through the five-class line, the extension unit is used for carrying out level amplification complementary adaptation processing on the two first mixed intermediate frequency signals to obtain two second mixed intermediate frequency signals after adaptation processing, the two second mixed intermediate frequency signals are transmitted to the remote unit through the five-class line, the two second mixed intermediate frequency signals are subjected to amplification filtering processing through the remote unit to obtain two third mixed intermediate frequency signals, the two third mixed intermediate frequency signals are subjected to amplification filtering processing to obtain downlink radio frequency signals, the two downlink radio frequency signals are radiated and covered through the two external antennas, so that the signal transmission method provided by the embodiment of the invention adopts independent receiving and transmitting paths of the two external antennas, the two received independent radio frequency signals are respectively transferred to combined transmission of different intermediate frequency bands, the capacity of the whole signal transmission system is effectively improved, and the terminal channel of the MIMO transmission system is compatible with 2 Xsingle channels at the same time, and the double-channel MIMO single-channel working matrix function is realized.
Drawings
Fig. 1 is a schematic structural diagram of a signal transmission system according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a structure of a source unit according to an embodiment of the present invention;
Fig. 3 is a circuit block diagram of the source unit according to the embodiment of the present invention;
FIG. 4 is a block circuit diagram of an expansion unit according to an embodiment of the present invention;
FIG. 5 is a block circuit diagram of a remote unit according to an embodiment of the present invention;
Fig. 6 is a first schematic flow chart illustrating an implementation of a signal transmission method according to an embodiment of the present invention;
Fig. 7 is a schematic flowchart illustrating an implementation procedure of step S601 in fig. 6 according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of an implementation flow of a signal transmission method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 is a schematic diagram of a configuration of a signal transmission system according to an embodiment of the present invention, and as shown in fig. 1, the signal transmission system includes a source unit (CU)10, an Extension Unit (EU)20, and a Remote Unit (RU) 30; the signal transmission among the source unit 10, the extension unit 20 and the remote unit 30 is realized through five-type line transmission; wherein,
The signal source unit 10 is configured to perform frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals; combining the two paths of first mixed intermediate-frequency signals and transmitting the combined signals to the extension unit through a five-class line;
In one embodiment, as shown in fig. 2, the source unit 10 is externally connected with two antennas; the signal source unit 10 comprises a receiving end 11, two amplifying and filtering circuits 12, two mixers 13 corresponding to the two amplifying and filtering circuits, and a combiner 14; wherein,
The receiving end 11 is specifically configured to receive two paths of radio frequency signals through two paths of external antennas;
The two-path amplifying and filtering circuit 12 is specifically configured to amplify and filter the two paths of radio frequency signals received by the receiving end to obtain two paths of filtered radio frequency signals;
The frequency mixer 13 is specifically configured to perform frequency mixing processing on the two filtered radio frequency signals respectively to obtain two first mixed intermediate frequency signals;
The two paths of first mixed intermediate-frequency signals are respectively located in different intermediate-frequency bands.
The combiner 14 is specifically configured to combine the two first mixed intermediate frequency signals and transmit the combined signals to the expansion unit through a five-class line.
in order to more intuitively represent the composition structure and signal transmission condition of each device in the source unit 10, reference may be made to the circuit block diagram of the source unit 10 shown in fig. 3, as shown in fig. 3, the source unit 10 implements signal output through an RJ45 chip, and it can be found that the five types of lines include four twisted pairs, wherein the two first mixed intermediate frequency signals and the two second mixed intermediate frequency signals are transmitted through two twisted pairs, the local oscillator synchronization signal is transmitted through one twisted pair, and the network synchronization signal such as an L TE network is transmitted through another twisted pair.
The extension unit 20 is configured to perform level amplification supplementary adaptation processing on the two first mixed intermediate frequency signals to obtain two adapted second mixed intermediate frequency signals; transmitting the two paths of second mixed intermediate frequency signals to the remote unit through a five-class line;
Specifically, as shown in fig. 4, the extension unit 20 is responsible for performing branch-and-branch processing between 1 source unit 10 and 8 remote units 30, performing automatic level adaptation on uplink and downlink mixed intermediate frequency signals, and performing no performance processing on the signals to extend the transmission distance thereof.
The remote unit 30 is configured to perform amplification and filtering processing on the two paths of second mixed intermediate-frequency signals to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; and the two downlink radio frequency signals are radiated and covered by two external connecting antennas.
Specifically, as shown in fig. 5, the remote unit 30 is responsible for receiving two paths of third mixed intermediate frequency signals transmitted by the extension unit 20, converting the signals into two paths of downlink radio frequency signals through amplification and filtering, and then radiating and covering the signals through two paths of external antennas.
In an embodiment, the remote unit 30 is further configured to receive two uplink feedback signals from the terminal through two external antennas; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals; transmitting the two paths of filtered uplink feedback signals to the extension unit through a five-class line;
Specifically, the remote unit 30 is also responsible for receiving signal coverage strength data at the user terminal side through two external antennas and acquiring two uplink feedback signals of data types such as coverage area network quality and user perception data; amplifying, filtering and converting the signals into two paths of uplink feedback signals after filtering; and then transmitted to the expansion unit 20 through the five-type line, and further transmitted back to the source unit 10.
The extension unit 20 is further configured to perform level amplification supplementary adaptation processing on the two filtered uplink feedback signals to obtain two adapted uplink feedback signals; transmitting the two adaptive uplink feedback signals to the information source unit through a five-class line;
The information source unit 10 is further configured to perform frequency mixing removal processing on the two paths of uplink feedback signals after the adaptation processing, so as to obtain two paths of uplink feedback signals after the frequency mixing removal processing; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
Here, the source unit 10, the extension unit 20 and the remote unit 30 are all powered by active ethernet POE.
therefore, according to the signal transmission system provided by the embodiment of the invention, the two independent external antennas are adopted for independent transceiving paths, the received two independent radio frequency signals are respectively moved to different intermediate frequency bands for non-interfering combined transmission, the channel capacity of the whole signal transmission system is effectively improved, the singularity of a channel matrix between a base station and a terminal is ensured, the 2 × 2MIMO function is realized, and the single/double current compatible work is realized.
Example two
Fig. 6 is a schematic flow chart of a first implementation flow of a signal transmission method according to an embodiment of the present invention, where the method is applied to a signal transmission system including a source unit 10, an extension unit 20, and a remote unit 30 according to the first embodiment of the present invention; as shown in fig. 6, the signal transmission method according to the embodiment of the present invention includes:
Step S601: the signal source unit 10 performs frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals, and the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit 20 through a five-class line;
In an embodiment, as shown in fig. 7, the step S601 specifically includes:
Step S6011: receiving two paths of radio frequency signals through two paths of external antennas;
Step S6012: amplifying and filtering the two paths of radio frequency signals to obtain two paths of filtered radio frequency signals;
Step S6013: respectively carrying out frequency mixing processing on the two filtered radio frequency signals to obtain two first mixed intermediate frequency signals;
The two paths of first mixed intermediate-frequency signals are respectively located in different intermediate-frequency bands.
Step S6014: the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit 20 through a five-class line.
Wherein the five types of wires comprise four twisted pairs; in practical application, the two first mixed intermediate-frequency signals and the two second mixed intermediate-frequency signals are transmitted through two pairs of twisted pairs in the five types of lines; a pair of twisted-pair lines transmits local oscillator synchronous signals; the other twisted pair transmits network synchronization signals.
therefore, in a signal transmission system, the five lines are utilized to transmit local oscillator synchronous signals and L TE synchronous signals besides mixed differential intermediate frequency signals, so that the signal anti-interference capability is greatly improved, shielding processing is not needed, the cost is low, and the performance is excellent.
In addition, in practical applications, the source unit 10, the extension unit 20 and the remote unit 30 are all powered by active ethernet POE, so as to greatly save external power supply nodes.
Step S602: performing level amplification supplementary adaptation processing on the two paths of first mixed intermediate-frequency signals by using the extension unit 20 to obtain two paths of second mixed intermediate-frequency signals after adaptation processing; transmitting the two second mixed intermediate frequency signals to the remote unit 30 through a five-type line;
Step S603: amplifying and filtering the two paths of second mixed intermediate-frequency signals through the remote unit 30 to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; and the two downlink radio frequency signals are radiated and covered by two external connecting antennas.
In an embodiment, as shown in fig. 8, the method further comprises:
Step S604: receiving two uplink feedback signals from the terminal through the remote unit 30; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals; transmitting the two filtered uplink feedback signals to the extension unit 20 through a five-class line;
Step S605: performing level amplification supplementary adaptation processing on the two filtered uplink feedback signals through the extension unit 20 to obtain two adapted uplink feedback signals; transmitting the two adaptive uplink feedback signals to the information source unit 10 through a five-class line;
Step S606: the information source unit 10 performs frequency mixing removal processing on the two paths of uplink feedback signals after the adaptation processing to obtain two paths of uplink feedback signals after the frequency mixing removal processing; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
therefore, according to the signal transmission method provided by the embodiment of the invention, the two independent external antennas are adopted for independent transceiving paths, the received two independent radio frequency signals are respectively moved to different intermediate frequency bands for non-interfering combined transmission, the channel capacity of the whole signal transmission system is effectively improved, the singularity of a channel matrix between a base station and a terminal is ensured, the 2 × 2MIMO function is realized, and the single/double current compatible work is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A signal transmission method, characterized in that the method is applied to a signal transmission system comprising a source unit, an extension unit and a remote unit; the method comprises the following steps:
The signal source unit is used for carrying out frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals, and the two first mixed intermediate frequency signals are combined and then transmitted to the extension unit through a five-class line;
Performing level amplification supplementary adaptation processing on the one path of combined first mixed intermediate-frequency signals by using the extension unit to obtain one path of adapted second mixed intermediate-frequency signals; transmitting the one path of second mixed intermediate frequency signal to the remote unit through a five-type line;
The remote unit amplifies and filters the one path of second mixed intermediate-frequency signal and then branches the signal to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; the two downlink radio frequency signals are radiated and covered by two external connecting antennas;
The five types of lines comprise four twisted pairs, one path of first mixed intermediate-frequency signals after the combination from the information source unit to the extension unit and one path of second mixed intermediate-frequency signals from the extension unit to the remote unit are transmitted through the first twisted pair, local oscillator synchronous signals are transmitted through the second twisted pair, and network synchronous signals are transmitted through the third twisted pair;
The method further comprises the following steps:
And transmitting the uplink feedback signal after one path of combination from the remote unit to the information source unit through a fourth twisted pair.
2. The method of claim 1, wherein the mixing the two received rf signals by the source unit to obtain two first mixed if signals, and combining the two first mixed if signals and transmitting the combined signals to the extension unit through a five-type line includes:
Receiving two paths of radio frequency signals through two paths of external antennas;
Amplifying and filtering the two paths of radio frequency signals to obtain two paths of filtered radio frequency signals;
Respectively carrying out frequency mixing processing on the two filtered radio frequency signals to obtain two first mixed intermediate frequency signals;
And combining the two paths of first mixed intermediate-frequency signals and transmitting the combined signals to the extension unit through a five-class line.
3. The method according to claim 1, wherein the two first mixed if signals are located in different if bands.
4. The method of claim 1, wherein the source unit, the extension unit, and the remote unit are all powered over active ethernet POE.
5. The method according to any one of claims 1 to 4, further comprising:
Receiving two paths of uplink feedback signals from a terminal through the remote unit; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals;
The transmitting, by a fourth twisted pair, a combined uplink feedback signal from the remote unit to the source unit includes:
Transmitting the combined uplink feedback signal of the combined path after the filtering processing to the extension unit through the fourth twisted pair;
Performing level amplification supplementary adaptation processing on the uplink feedback signal after the filtering processing and combining of the one path of combining to obtain an adapted uplink feedback signal; transmitting the adapted uplink feedback signal to the information source unit through the fourth twisted pair;
The signal source unit divides the adaptive one path of uplink feedback signals and then performs demixing processing to obtain two paths of uplink feedback signals after demixing processing; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
6. A signal transmission system, comprising a source unit, an extension unit and a remote unit;
The signal source unit is used for carrying out frequency mixing processing on the two received radio frequency signals to obtain two first mixed intermediate frequency signals; combining the two paths of first mixed intermediate-frequency signals and transmitting the combined signals to the extension unit through a five-class line;
The extension unit is used for carrying out level amplification supplementary adaptation processing on the one path of combined first mixed intermediate-frequency signals to obtain one path of adapted second mixed intermediate-frequency signals; transmitting the one path of second mixed intermediate frequency signal to the remote unit through a five-type line;
The remote unit is used for carrying out amplification filtering processing on the one path of second mixed intermediate-frequency signal and then shunting the path of second mixed intermediate-frequency signal to obtain two paths of third mixed intermediate-frequency signals; amplifying and filtering the two paths of third mixed intermediate frequency signals to obtain two paths of downlink radio frequency signals; the two downlink radio frequency signals are radiated and covered by two external connecting antennas; the fifth line comprises four twisted pairs, a first twisted pair is used for transmitting one path of first mixed intermediate-frequency signals after the combination from the source unit to the extension unit and one path of second mixed intermediate-frequency signals from the extension unit to the remote unit, a second twisted pair is used for transmitting local oscillator synchronous signals, and a third twisted pair is used for transmitting network synchronous signals; and the fourth twisted pair is used for transmitting the uplink feedback signal after one path of combination from the remote unit to the information source unit.
7. The system of claim 6, wherein the source unit is externally connected with two antennas; the signal source unit comprises a receiving end, two amplifying and filtering circuits, two mixers corresponding to the two amplifying and filtering circuits, and a branching and combining device;
The receiving end is used for receiving two paths of radio frequency signals through two paths of external antennas;
The two paths of amplifying and filtering circuits are used for amplifying and filtering the two paths of radio frequency signals received by the receiving end to obtain two paths of filtered radio frequency signals;
The frequency mixer is used for respectively carrying out frequency mixing processing on the two filtered radio frequency signals to obtain two first mixed intermediate frequency signals;
And the combiner is used for combining the two paths of first mixed intermediate-frequency signals and then transmitting the combined signals to the extension unit through a five-class line.
8. The system of claim 6, wherein the source unit, the expansion unit, and the remote unit are each powered over active ethernet POE.
9. The system according to any one of claims 6 to 8,
The remote unit is also used for receiving two paths of uplink feedback signals from the terminal through two external antennas; amplifying and filtering the two uplink feedback signals to obtain two filtered uplink feedback signals; transmitting the combined uplink feedback signal of the combined path after the filtering processing to the extension unit through the fourth twisted pair;
The extension unit is further configured to perform level amplification supplementary adaptation processing on the uplink feedback signal combined in one path of the combined path after the filtering processing to obtain an adapted uplink feedback signal in the other path; transmitting the adapted uplink feedback signal to the information source unit through the fourth twisted pair;
The information source unit is also used for carrying out demixing processing on the adapted uplink feedback signal after being shunted to obtain two uplink feedback signals after the demixing processing; and transmitting the two uplink feedback signals subjected to the frequency mixing removal processing to a network monitoring platform through two external antennas.
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