CN110324064B - Low intermodulation multi-system combiner - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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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
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a multi-system combiner with low intermodulation, which comprises a signal attenuation module, N primary combiners, a power dividing module and N secondary combiners, wherein N is an integer greater than 1. The invention relates to a multi-system combining device with low intermodulation, which is characterized in that through arranging a signal attenuation module and a POI system consisting of a primary combiner, a power dividing module and a secondary combiner, all input network signals are attenuated by the signal attenuation module and then are combined by the POI system, so that the converging power of the combining can be greatly reduced, and the converging power is reduced by 1dB, and the 3dB of reflected third-order intermodulation reaches a base station receiver, so that intermodulation interference can be greatly reduced, and the multi-system combining device can realize MIMO functions without uplink interference.
Description
Technical Field
The invention relates to the field of multi-system combining of a mobile communication network, in particular to a multi-system combining device with low intermodulation.
Background
With the development of mobile communication, the used system and frequency band are increased continuously, and co-building sharing is also becoming a trend in industry gradually, but as more high frequency bands and more carriers are used, the total power after combining is also increased continuously, so that intermodulation interference is more and more serious. When the two-way distribution system is adopted, the MIMO function is realized, the system performance is greatly reduced due to a large amount of uplink intermodulation interference, and the user perception is influenced. The MIMO function can be well realized by adopting a three-way system or a four-way system, but the engineering cost is greatly improved, the property coordination difficulty is increased, and the combination performance of the multiple systems is more and more unsatisfactory for operators.
The existing double-cable multi-system combining platform mainly has two types, wherein the first type is that the FDD system receives and transmits separately, and intermodulation signals generated due to uplink and downlink separation cannot interfere the uplink of the FDD system; the second type of uplink and downlink are not covered by separating the direct joint paths, and although the MIMO function is realized, intermodulation signals can interfere all the uplink systems when the number of the combined systems is large and the power is high. Therefore, both of the two methods have disadvantages, and firstly, although the FDD system has no interference, the MIMO function cannot be realized; the second type can realize the MIMO function, but all systems have a large amount of uplink interference, so that the optimal multipath combining state cannot be achieved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a low intermodulation multi-system combining device which can realize the MIMO function and has no uplink interference.
The aim of the invention is realized by the following technical scheme:
A low intermodulation, multi-system combining apparatus comprising: the power divider comprises a signal attenuation module, N primary combiners, a power dividing module and N secondary combiners, wherein N is an integer greater than 1;
The signal attenuation module comprises a plurality of signal input ends and a plurality of signal output ends, wherein each signal input end is used for accessing network signals of a first type, and each signal output end is used for outputting the network signals of the first type after the network signals are attenuated by the signal attenuation module;
the first-stage combiner comprises a first-stage combined signal output end and a plurality of network signal input ends with different frequency bands, wherein each network signal input end is connected with the signal output end of the corresponding signal attenuation module, the first-stage combined signal output end outputs a plurality of first-stage combined signals after the attenuated network signals are combined by the first-stage combiner, and the first-stage combiners are used for outputting a plurality of same first-stage combined signals;
The power dividing module comprises a plurality of first input ends, a plurality of second input ends and a plurality of branch output ends, wherein each first input end is connected with the corresponding first-class combined signal output end, each second input end is used for accessing network signals of a second type system, and each branch output end is used for outputting a plurality of identical branch signals after the power dividing module divides the first-class combined signal and the second type network signals;
The secondary combiner comprises a secondary combined signal output end and a plurality of network signal combined ends, each network signal combined end is connected with the corresponding branching output end of the power dividing module, the secondary combined signal output end outputs a plurality of secondary combined signals after branching signals are combined by the secondary combiner, the secondary combiner outputs a plurality of identical secondary combined signals, and each secondary combined signal is used for being connected with an uplink signal cable and/or a downlink signal cable respectively.
In one embodiment, the signal attenuation module includes a plurality of attenuators, an input end of each of the attenuators is used for accessing the network signals of the first type, and an output end of each of the attenuators is used for outputting the network signals of the first type after the network signals of the first type are attenuated by the signal attenuation module.
In one embodiment, the attenuator is an adjustable attenuator.
In one embodiment, the multi-system combiner includes three primary combiners, each primary combiner includes a first combiner output end and a plurality of primary signal combining ends, each primary signal combining end is connected with the corresponding signal output end of the signal attenuation module, the first combiner output end outputs a primary combiner signal after a plurality of attenuated network signals are combined by the primary combiners, and the three primary combiners output three identical primary combiner signals.
In one embodiment, each primary combiner includes a first combining output end and two primary signal combining ends, each primary signal combining end is connected with the corresponding signal output end of the signal attenuation module, and the first combining output end outputs a primary combining signal after a plurality of attenuated network signals are combined by the primary combiner.
In one embodiment, the multi-system combiner includes four secondary combiners, each secondary combiner includes a secondary combined signal output end and a plurality of network signal combined ends, each network signal combined end is connected with the corresponding split output end of the power splitting module, the secondary combined signal output end outputs a plurality of secondary combined signals of which the split signals are combined by the secondary combiners, and the four secondary combiners output four identical secondary combined signals.
In one embodiment, the second-stage combiner is a four-frequency combiner, and four signal input ends of the four-frequency combiner are respectively connected with the shunt output ends of the corresponding power dividing modules.
In one embodiment, the multi-system combiner includes four secondary combiners, wherein two secondary combined signals after the secondary combiners are combined are used for being connected with the uplink signal cable, and the other two secondary combined signals after the secondary combiners are combined are used for being connected with the downlink signal cable.
In one embodiment, the first type of network signals include network signals sent by a telecommunications CDMA system, a mobile GSM system, a mobile DCS system, a telecommunications 1.8GL system, a mobile TD-F system, a unicom WCDMA system, and a mobile TD-E system.
In one embodiment, the second type of network signal comprises a network signal sent by a connected 1.8GS system and a telecommunications 2.1GL system.
Compared with the prior art, the invention has the following advantages:
1. The invention relates to a multi-system combining device with low intermodulation, which is characterized in that through arranging a signal attenuation module and a POI system consisting of a primary combiner, a power dividing module and a secondary combiner, all input network signals are attenuated by the signal attenuation module and then are combined by the POI system, so that the converging power of the combining can be greatly reduced, and the converging power is reduced by 1dB, and the 3dB of reflected third-order intermodulation reaches a base station receiver, so that intermodulation interference can be greatly reduced, and the multi-system combining device can realize MIMO functions without uplink interference.
2. The multi-system combining device solves the problem of passive intermodulation interference which cannot be solved by the traditional POI platform without separating the receiving and transmitting, can realize the MIMO function through the two-path antenna feed system or the distribution system, not only improves the performance of the multi-system combining of mobile communication, but also reduces the engineering construction cost.
3. The multi-system combining device of the invention has the advantages that all system power is transmitted to the distribution system except the loss of the combining during the combining, and no artificial unnecessary loss exists, so that the loss during the signal transmission is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low intermodulation multi-system combining apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a low intermodulation multi-system combining apparatus in another embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to meet the requirement of mobile communication multi-system combining, and solve the problem of high intermodulation interference existing in the current mobile communication multi-system combining, the application needs to provide a double-cable low intermodulation POI platform which can realize the MIMO function and has no uplink interference.
In one embodiment, referring to fig. 1, a low intermodulation multi-system combining apparatus includes: the signal attenuation module 100, the N first-stage combiners 200, the power dividing module 300 and the N second-stage combiners 400, N is an integer greater than 1, and N is determined according to the coverage capability of the network signal to be accessed, that is, the number of N can be flexibly selected by one of ordinary skill in the art according to the actual situation. The signal attenuation module 100 is configured to attenuate an input signal; the primary combiner 200 is configured to combine network signals of various systems and output the combined network signals to the power dividing module; the power dividing module 300 is configured to divide one path of input signal energy into two paths or multiple paths of output; the secondary combiner 400 is configured to combine the network signals output by the power splitting modules 300 and output the combined network signals to an external network system, where the network system is an antenna feeder system or a distribution system.
Referring to fig. 1, the signal attenuation module 100 includes a plurality of signal input terminals and a plurality of signal output terminals, each of the signal input terminals is used for accessing a network signal of a first type, and each of the signal output terminals is used for outputting the network signal of the first type after being attenuated by the signal attenuation module. Thus, by providing a plurality of signal input terminals and signal output terminals, the network signals of the system can be effectively connected. And through setting up the signal attenuation module for each network signal of input is first through the attenuation of signal attenuation module, and then through POI system to carry out the combiner way, can reduce the aggregate power of combiner way by a wide margin, and the aggregate power reduces 1dB every time, and the reflection third order intermodulation reaches the base station receiver and reduces 3dB, consequently can reduce intermodulation interference by a wide margin.
It should be noted that, for example, referring to fig. 2, the first type of network signals include network signals sent by a telecommunication CDMA system, a mobile GSM system, a mobile DCS system, a telecommunication 1.8GL system, a mobile TD-F system, a WCDMA system and a mobile TD-E system. That is, each signal input terminal of the signal attenuation module 100 is connected to the signal system of each first type network signal. As another example, the second type of network signals include network signals sent by the in-line 1.8GS system and the telecom 2.1GL system. The signal input terminal of the signal attenuation module 100 is connected to the signal system of each second type network signal.
Referring to fig. 1, the primary combiner 200 includes a primary combined signal output end and a plurality of network signal input ends with different frequency bands, each of the network signal input ends is connected to a signal output end of the corresponding signal attenuation module, the primary combined signal output end outputs a primary combined signal obtained by combining a plurality of attenuated network signals by the primary combiner, and the primary combiners are configured to output a plurality of identical primary combined signals. It should be noted that, the primary combined signal output end outputs a plurality of primary combined signals after the attenuated network signals are combined by the primary combiner, that is, the primary combined signal output end outputs a primary combined signal, and outputs a primary combined signal after each attenuated network signal passes through the combining function of the primary combiner 200. Therefore, the first-stage combiner 200 performs the combining operation on the network signals from the signal attenuation modules, the signals after passing through the signal attenuation modules are subjected to power attenuation, and after combining again, the combined aggregate power is greatly reduced compared with the traditional one, so that the mutual interference of the signals can be reduced.
Referring to fig. 1, the power splitting module 300 includes a plurality of first input terminals, a plurality of second input terminals and a plurality of splitting output terminals, each of the first input terminals is connected to a corresponding one of the first-class combined signal output terminals, each of the second input terminals is configured to be connected to a network signal of a second type of standard, and each of the splitting output terminals is configured to output a plurality of identical splitting signals after the power splitting module splits the first-class combined signal and the second type of network signal. Therefore, by arranging the power dividing module, the network signals output by each primary combiner can be divided into the same number of divided signals.
As can be appreciated, referring to fig. 2, the power dividing module 300 includes one or more of a first power dividing unit 310, a second power dividing unit 320, a third power dividing unit 330 and a fourth power dividing unit 340, signal input ends of the first power dividing unit, the second power dividing unit, the third power dividing unit and the fourth power dividing unit are respectively connected with the first-stage combiner, and signal output ends of the first power dividing unit, the second power dividing unit, the third power dividing unit and the fourth power dividing unit are respectively connected with the second-stage combiner; thus, the branching of the network of each input system can be realized. Of course, reasonable collocation can be performed according to the type of the access network signal and the equipment channel condition.
Specifically, the first power dividing unit includes an input end and a plurality of output ends, the input end of the first power dividing unit is connected with the first-stage combined signal output end of the first-stage combiner, the output end of each first power dividing unit outputs a first power dividing network signal which is branched by the first power dividing unit, and each first power dividing network signal is respectively connected with the input end of the corresponding second-stage combiner. Thus, by providing the first power dividing unit, it is possible to divide a single channel network signal into multiple channels of network signals.
The second power dividing unit comprises two input ends and a plurality of output ends, wherein the input end of one second power dividing unit is connected with the corresponding first-stage combined signal output end of the first-stage combiner, the input end of the other second power dividing unit is used for accessing network signals of a second type of system, the output end of each second power dividing unit outputs second power dividing network signals which are branched by the second power dividing unit, and each second power dividing network signal is respectively connected with the input end of the corresponding second-stage combiner; therefore, by arranging the second power dividing unit, the second power dividing unit can firstly receive two or more different network signals and can be used for dividing the single-channel network signals of the same-frequency-band standard into multiple network signals.
The third power dividing unit comprises two input ends and a plurality of output ends, wherein the input end of the third power dividing unit is connected with the corresponding first-stage combining signal output end of the first-stage combiner, the input end of the other third power dividing unit is used for accessing network signals of a second type of system, the output end of each third power dividing unit outputs third power dividing network signals which are branched by the third power dividing unit, and each third power dividing network signal is respectively connected with the input end of the corresponding second-stage combiner. Therefore, by arranging the third power dividing unit, the third power dividing unit can firstly receive two or more different network signals and can be used for dividing the two-channel network signals of the same-frequency-band system into multiple network signals.
The fourth power dividing units comprise an input end and a plurality of output ends, the input end of one fourth power dividing unit is connected with the output end of one primary combining signal of one primary combiner, the output end of each fourth power dividing unit outputs a fourth power dividing network signal which is branched by the fourth power dividing unit, and each fourth power dividing network signal is respectively connected with the input end of the corresponding secondary combiner. Therefore, the fourth power dividing unit can be used for dividing the network signals of the same frequency band into multiple paths of network signals, wherein the network signals have two channels and the network signals have a single channel.
Therefore, by arranging the four power dividing units, the network signals after the first combination can be divided into the same number of branch signals through the power dividing units and then the combination is carried out, so that the uplink interference in the MIMO function is reduced, and the stability of network signal transmission is improved. And furthermore, the problem of passive intermodulation interference which cannot be solved by the traditional POI platform without separating the receiving and transmitting, and the MIMO function can be realized through a two-path antenna feed system or a distribution system, so that the combination performance of a plurality of mobile communication systems is improved, and the engineering construction cost is reduced.
Further, the first power dividing unit comprises a four-power divider, the input end of the four-power divider is connected with the first-level combining signal output end of the first-level combiner, the four output ends of the four-power divider output first power dividing network signals which are branched by the four-power divider, and the four first power dividing network signals are correspondingly connected with the four input ends of the second-level combiner respectively. Therefore, the network signals of a single channel can be divided into four network signals, and then the network signals are combined, so that the uplink signal interference is reduced.
The second power dividing unit comprises a first bridge and two first power dividers, the first bridge comprises two input ends and two output ends, one input end of the first bridge is connected with one-level combined signal output end of the first level combiner, the other input end of the first bridge is used for accessing network signals of a second type, one output end of the first bridge is connected with one input end of the first power divider, the other output end of the first bridge is connected with the other input end of the first power divider, each first power divider comprises two output ends, four output ends of the two first power dividers are correspondingly connected with four input ends of the second level combiner respectively, and the four output ends of the two first power dividers correspondingly output network signals divided by the first bridge and the two first power dividers into four input ends of the second level combiner respectively. Therefore, by setting the bridge, the two-channel network signals of the same frequency band system can be combined, then the two power splitters are separated into four network signals, and the four network signals are output to the secondary combiner for combining, so that the effectiveness of the network signals of the receiving system can be improved, the combining is performed, the compatibility of the network system is improved, and the interference is reduced.
It should be further noted that the third power dividing unit includes a second bridge and two second power dividers, where the second bridge includes two input ends and two output ends, one input end of the second bridge is connected to the first-stage combining signal output end of the first-stage combiner, and the other input end of the second bridge is used for accessing network signals of a second type, for example, network signals of a mobile TD-E system; one output end of the second bridge is connected with an input end of a second power divider, the other output end of the second bridge is connected with an input end of another second power divider, each second power divider comprises two output ends, the two second power dividers comprise four output ends, the four output ends of the two second power dividers output second power division network signals which are shunted by the second power division units, and each second power division network signal is respectively connected with an input end of a corresponding second-stage combiner; the four output ends of the two second power dividers are correspondingly connected with the four input ends of the second-stage combiner respectively, and the four output ends of the two second power dividers correspondingly output the network signals divided by the second bridge and the two second power dividers to the four input ends of the second-stage combiner respectively. Therefore, by arranging the bridge, one channel of the standard network signal can be combined, then the two power splitters are used for dividing the standard network signal into four network signals, and the four network signals are output to the secondary combiner for combining, so that the effectiveness of the network signal of the receiving standard can be improved, and then the combining is performed, and interference is reduced.
The fourth power dividing unit comprises a fourth power divider, the input end of the fourth power divider is connected with the first-level combining signal output end of the first-level combiner, four output ends of the fourth power divider output fourth power dividing network signals which are branched by the fourth power divider, and four fourth power dividing network signals are correspondingly connected with four input ends of the second-level combiner respectively. Therefore, the network signals of a single channel or a double channel can be divided into four network signals, and then the four network signals are combined, so that the uplink signal interference is reduced.
Thus, the branching of the network of each input system can be realized. Of course, reasonable collocation can be performed according to the type of the access network signal and the equipment channel condition.
Referring to fig. 1, the secondary combiner 400 includes a secondary combined signal output end and a plurality of network signal combined ends, each of the network signal combined ends is connected to the corresponding split output end of the power splitting module, the secondary combined signal output end outputs a plurality of secondary combined signals obtained by combining the split signals by the secondary combiner, the secondary combiners output a plurality of identical secondary combined signals, and each of the secondary combined signals is used for accessing an uplink signal cable and/or a downlink signal cable. Therefore, when in combination, all system power is transmitted to the distribution system except the loss of combination, and no artificial unnecessary loss exists, so that the loss in signal transmission is reduced.
It should be noted that, the signal attenuation module includes a plurality of attenuators, the input end of each attenuator is used for accessing the network signal of the first type, and the output end of each attenuator is used for outputting the network signal of the first type after the attenuation of the signal attenuation module. In this embodiment, the attenuator is an adjustable attenuator. Thus, by arranging the adjustable attenuator, frequency modulation can be performed according to the actual network signal requirement.
It should be noted that, the multi-system combiner includes three primary combiners, each primary combiner includes a first combiner output end and a plurality of primary signal combiner ends, each primary signal combiner end is connected with the corresponding signal output end of the signal attenuation module, the first combiner output end outputs a primary combiner signal after a plurality of attenuated network signals are combined by the primary combiners, and the three primary combiners output three same primary combiner signals. Therefore, by arranging three primary combiners, the synthesis operation of the standard network signals can be realized, and the interference of the signals is further reduced.
It should be noted that each primary combiner includes a first combining output end and two primary signal combining ends, each primary signal combining end is connected with the corresponding signal output end of the signal attenuation module, and the first combining output end outputs a primary combining signal after a plurality of attenuated network signals are combined by the primary combiner. Thus, by setting two primary signal combining ends, network signals in the same standard frequency band can be combined.
It should be noted that, the multi-system combiner includes four secondary combiners, each secondary combiner includes a secondary combined signal output end and a plurality of network signal combined ends, each network signal combined end is connected with the corresponding branching output end of the power splitting module, the secondary combined signal output end outputs a plurality of secondary combined signals after the branching signals are combined by the secondary combiners, and the four secondary combiners output four identical secondary combined signals. Thus, by arranging four secondary combiners, four standard network signals can be received, and four identical network signals can be output at the same time.
It should be noted that the multi-system combining device includes four secondary combiners, where two secondary combined signals after the secondary combiners are combined are used to connect with the uplink signal cable, and the other two secondary combined signals after the secondary combiners are combined are used to connect with the downlink signal cable. Thus, the four secondary combiners are respectively connected with different network systems, such as indoor separate systems or antenna feed systems.
It should be noted that the second-stage combiner is a four-frequency combiner, and four signal input ends of the four-frequency combiner are respectively connected with the shunt output ends of the corresponding power dividing modules. Thus, by arranging the four-frequency combiner, the device cost can be reduced.
It can be understood that the wireless radio frequency signals of 9 mobile communication system base stations of three operators in China are attenuated by the adjustable attenuators, the attenuation of each adjustable attenuator is required to be compared according to the actual link budget of each system, and the system attenuation is larger when the link budget is larger; the signals passing through the adjustable attenuator are combined for the first time through a primary combiner and an electric bridge; the signals after the first combination are divided into the same number of divided signals through the power divider. And the split signals enter a secondary combiner for combining, and after the split signals are combined, the split signals enter a passive distribution system through an output port to complete coverage. Thus, by arranging the adjustable attenuator, the primary combiner, the bridge, the power divider and the secondary combiner. The input interface feeds in high-power signals output by each base station, the signals are attenuated by the adjustable attenuator and then pass through the primary combiner, the bridge, the power divider and the secondary combiner, and finally the signals are output to the antenna feed system or the distribution system through the output interface to realize distributed coverage, so that the total power of the converged signals is controlled, the intermodulation interference signal intensity is reduced, and the POI platform realizes the MIMO function through double cables. In addition, by the methods of redundant power attenuation, base station power advance distribution, common-frequency-band system different-frequency combining and the like, the problem of passive intermodulation interference which cannot be solved by the traditional POI platform without separation of receiving and transmitting is solved, and the MIMO function can be realized through the two-path antenna feeder system or the distribution system, so that the performance of multi-system combining of mobile communication is improved, the engineering construction cost is reduced, and the method has a large market application prospect.
Compared with the prior art, the invention has the following advantages:
1. The invention relates to a multi-system combining device with low intermodulation, which is characterized in that through arranging a signal attenuation module and a POI system consisting of a primary combiner, a power dividing module and a secondary combiner, all input network signals are attenuated by the signal attenuation module and then are combined by the POI system, so that the converging power of the combining can be greatly reduced, and the converging power is reduced by 1dB, and the 3dB of reflected third-order intermodulation reaches a base station receiver, so that intermodulation interference can be greatly reduced, and the multi-system combining device can realize MIMO functions without uplink interference.
2. The multi-system combining device solves the problem of passive intermodulation interference which cannot be solved by the traditional POI platform without separating the receiving and transmitting, can realize the MIMO function through the two-path antenna feed system or the distribution system, not only improves the performance of the multi-system combining of mobile communication, but also reduces the engineering construction cost.
3. The multi-system combining device of the invention has the advantages that all system power is transmitted to the distribution system except the loss of the combining during the combining, and no artificial unnecessary loss exists, so that the loss during the signal transmission is reduced.
The above embodiments represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A low intermodulation multi-system combining apparatus, comprising: the power divider comprises a signal attenuation module, N primary combiners, a power dividing module and N secondary combiners, wherein N is an integer greater than 1;
The signal attenuation module comprises a plurality of signal input ends and a plurality of signal output ends, wherein each signal input end is used for accessing network signals of a first type, and each signal output end is used for outputting the network signals of the first type after the network signals are attenuated by the signal attenuation module;
the first-stage combiner comprises a first-stage combined signal output end and a plurality of network signal input ends with different frequency bands, wherein each network signal input end is connected with the signal output end of the corresponding signal attenuation module, the first-stage combined signal output end outputs a plurality of first-stage combined signals after the attenuated network signals are combined by the first-stage combiner, and the first-stage combiners are used for outputting a plurality of same first-stage combined signals;
The power dividing module comprises a plurality of first input ends, a plurality of second input ends and a plurality of branch output ends, wherein each first input end is connected with the corresponding first-class combined signal output end, each second input end is used for accessing network signals of a second type system, and each branch output end is used for outputting a plurality of identical branch signals after the power dividing module divides the first-class combined signal and the second type network signals;
The secondary combiner comprises a secondary combined signal output end and a plurality of network signal combined ends, each network signal combined end is connected with the corresponding branching output end of the power dividing module, the secondary combined signal output end outputs a plurality of secondary combined signals after branching signals are combined by the secondary combiner, the secondary combiner outputs a plurality of identical secondary combined signals, and each secondary combined signal is used for being connected with an uplink signal cable and/or a downlink signal cable respectively.
2. The low intermodulation multi-system combining apparatus of claim 1, wherein the signal attenuating module comprises a plurality of attenuators, wherein an input end of each of the attenuators is used for accessing the network signal of the first type, and an output end of each of the attenuators is used for outputting the network signal of the first type after the network signal is attenuated by the signal attenuating module.
3. The low intermodulation multi-system combining apparatus of claim 2, wherein the attenuator is an adjustable attenuator.
4. The low intermodulation multi-system combining apparatus of claim 1, wherein the multi-system combining apparatus comprises three primary combiners, each primary combiner comprises a first combining output end and a plurality of primary signal combining ends, each primary signal combining end is connected with the signal output end of the corresponding signal attenuation module, the first combining output end outputs a primary combining signal of a plurality of attenuated network signals after the primary combiners are combined, and the three primary combiners output three identical primary combining signals.
5. The low intermodulation multi-system combining apparatus according to claim 4, wherein each of said first-stage combiners comprises a first combining output terminal and two first-stage signal combining terminals, each of said first-stage signal combining terminals is connected to said signal output terminal of the corresponding signal attenuation module, and said first combining output terminal outputs a first-stage combining signal obtained by combining a plurality of attenuated network signals by said first-stage combiner.
6. The low intermodulation multi-system combining apparatus of claim 1, wherein the multi-system combining apparatus comprises four secondary combiners, each secondary combiners comprises a secondary combined signal output end and a plurality of network signal combining ends, each network signal combining end is connected with the corresponding branching output end of the power dividing module, the secondary combined signal output end outputs a plurality of secondary combined signals after the branching signals are combined by the secondary combiners, and the four secondary combiners output four identical secondary combined signals.
7. The low intermodulation multi-system combining apparatus according to claim 6, wherein said second-stage combiner is a four-frequency combiner, and four signal input terminals of said four-frequency combiner are respectively connected to said split output terminals of said corresponding power splitting module.
8. The low intermodulation multi-system combining apparatus of claim 6, wherein said multi-system combining apparatus comprises four secondary combiners, wherein two of said secondary combiners are adapted to be connected to said upstream signal cable, and two of said secondary combiners are adapted to be connected to said downstream signal cable.
9. The low intermodulation, multi-system combining apparatus of claim 1, wherein the first type of network signal comprises a network signal sent by a telecommunications CDMA system, a mobile GSM system, a mobile DCS system, a telecommunications 1.8GL system, a mobile TD-F system, a unicom WCDMA system, and a mobile TD-E system.
10. The low intermodulation multi-system combining apparatus of claim 1, wherein the second type of network signal comprises a network signal sent by a connected 1.8GS system and a telecommunication 2.1GL system.
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