CN107484237B - Self-adaptive system and method for unbalance of uplink and downlink - Google Patents
Self-adaptive system and method for unbalance of uplink and downlink Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
Abstract
The invention relates to the technical field of wireless communication, in particular to an adaptive system with unbalanced uplink and downlink and a method thereof, comprising wireless digital relay equipment which respectively carries out wireless signal transmission with a base station and a terminal through an antenna, a radio frequency transceiver module I (11) which carries out wireless signal transmission with the base station (1), a radio frequency transceiver module II (21) which carries out wireless signal transmission with the terminal (2) and an FPGA processing module (3) which is used for judging the signals received and transmitted by the radio frequency transceiver module I (11) and the signals received and transmitted by the radio frequency transceiver module II (21) and configuring an uplink transmitting channel for a designated terminal, and a modulation-demodulation module (4). The invention solves the problem of unbalanced uplink and downlink in wide coverage and deep coverage scenes, and avoids the problems of single pass, call drop, frequent switching and no user in a service area during paging caused by unbalanced uplink and downlink. The user perception can be better improved, and complaints are reduced.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to an adaptive system and a method for unbalanced uplink and downlink.
Background
The wireless signal attenuates along with the increase of the propagation distance, and under different environments, the shielding, reflection, refraction and absorption of buildings, plants and the like can cause the rapid fading of the wireless signal under certain scenes, so that the situation of insufficient signal strength and poor user communication performance can be caused at the cell edge of a wide coverage area or an indoor deep coverage area.
In GSM (Global System for Mobile Communications ), UMTS (Universal Mobile Telecommunications System, universal mobile telecommunications system) and LTE (Long Term Evolution ) FDD (Frequency Division Duplex, frequency division duplex) systems, different frequency points are used for uplink signals and downlink signals, and a frequency division duplex mode is adopted. Different frequency bands may be subjected to different degrees of fading in the spatial radiation process, and especially in the scene of wide coverage and deep coverage, the fading models of the downlink signal and the uplink signal have larger differences in certain areas and time periods.
Disclosure of Invention
The invention aims to provide an adaptive system and a method for unbalanced uplink and downlink, which solve the problem that in the prior art, wireless signals are difficult to balance due to different attenuation caused by the coverage area environment.
In order to solve the technical problems, the invention adopts the following technical scheme:
an adaptive system for uplink and downlink imbalance, comprising a wireless digital relay apparatus for wireless signal transmission with a base station and a terminal, respectively, through an antenna, the wireless digital relay apparatus comprising:
a first radio frequency transceiver module for transmitting wireless signals with the base station,
a second radio frequency transceiver module for transmitting wireless signals with the terminal,
is used for judging the signals received by the first radio frequency transceiver module and the signals received by the second radio frequency transceiver module, configuring an uplink transmitting channel to an FPGA processing module of a designated terminal,
the modulation and demodulation module is used for demodulating the uplink and downlink signals to obtain physical layer information of the uplink and downlink signals, and transmitting the physical layer information to the FPGA processing module;
the first radio frequency transceiver module is in wireless transmission with the base station after passing through the first duplex filter and the first antenna in sequence, and the second radio frequency transceiver module is in wireless transmission with the terminal after passing through the second duplex filter and the second antenna in sequence, wherein an amplifier is connected in series with an uplink between the first duplex filter and the first radio frequency transceiver module, and an amplifier is connected in series with a downlink between the second radio frequency transceiver module and the second duplex filter.
An adaptive method for uplink and downlink imbalance, comprising the steps of:
a wireless digital relay device is configured between the base station and the terminal, the wireless digital relay device comprises a first radio frequency receiving and transmitting module, a second radio frequency receiving and transmitting module, an FPGA processing module and a modulation and demodulation module,
the FPGA processing module collects base stations and environmental parameters of a wireless signal coverage area, and carries out uplink and downlink budget according to the maximum gain configuration of the wireless digital relay equipment to respectively obtain the uplink and downlink coverage areas, wherein the maximum gain configuration reserves gain allowance;
the FPGA module calculates downlink fading and interference between the base station and the wireless digital relay equipment and path loss and interference on the same uplink path according to the information received by the first transceiver module and the second radio frequency transceiver module;
the FPGA module calculates the signal-to-noise ratio required by the arrival of the uplink data of each terminal at the receiving port of the base station receiver, which is required by the demodulation of the base station receiver, according to the acquired information;
the FFPGA module calculates the signal strength required by the uplink output end of the wireless digital relay equipment;
and the FPGA module calculates the uplink digital gain in the wireless digital relay equipment according to the required signal intensity and configures the real-time amplification gain triggering the uplink data stream.
Further, the first radio frequency transceiver module performs wireless signal transmission with the base station, the second radio frequency transceiver module performs wireless signal transmission with the terminal, the FPGA processing module is configured to determine a signal received by the first radio frequency transceiver module and a signal received by the second radio frequency transceiver module, configure an uplink transmission channel to the FPGA processing module of the designated terminal, and the modulation demodulation module is configured to demodulate uplink and downlink signals to obtain physical layer information of the uplink and downlink signals, and transmit the physical layer information to the FPGA processing module, where the first radio frequency transceiver module performs wireless transmission with the base station after passing through the first duplex filter and the first antenna in sequence, and the second radio frequency transceiver module performs wireless transmission with the terminal after passing through the second duplex filter and the second antenna in sequence, where an amplifier is connected in series to an uplink between the first radio frequency transceiver module and the second duplex filter, and an amplifier is connected in series to a downlink between the second radio frequency transceiver module and the second duplex filter.
Further, in the wireless communication network, if the uplink limited transmission channel is limited, the uplink gain margin of the wireless digital relay device is set to zero, the gain margin of the downlink gain is set to 5dB outdoors, and 10dB indoors.
Further, the FPGA module calculates downlink fading and interference between the base station and the wireless digital relay device, and the specific method is as follows: the modulation-demodulation module transmits the physical layer signal information to the FPGA module, and the FPGA calculates fading P-P0 of a link uplink and downlink channel between the base station and the wireless digital relay device and corresponding interference factors P/SIR according to the received pilot channel power P, pilot channel signal-to-interference ratio and initial power configuration P0 of a pilot channel of the base station.
Further, the signal-to-noise ratio obtaining method comprises the following steps: the FPGA module obtains the uplink channel receiving power and the corresponding interference noise of each terminal according to the physical layer signal information transmitted by the modulation and demodulation module, and determines the signal-to-noise ratio required by the input end of the base station receiver according to the modulation mode of corresponding data.
Compared with the prior art, the invention has the beneficial effects that: by the adaptive gain control of the uplink, the problems of uplink and downlink unbalance in wide coverage and deep coverage scenes are solved, and the problems of single pass, call drop, frequent switching and no user in a service area during paging caused by the uplink and downlink unbalance are avoided. The user perception can be better improved, and complaints are reduced.
Drawings
Fig. 1 is a diagram of an adaptive system connection for uplink and downlink imbalance according to the present invention.
Fig. 2 is a connection block diagram of a wireless digital relay device.
Fig. 3 is a diagram illustrating uplink and downlink budget in the prior art.
Fig. 4 is a flowchart of the uplink and uplink interference calculation according to the present invention.
Fig. 5 is a graph of the uplink data stream gain configuration calculation according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 and 2 illustrate one embodiment of an adaptive system for uplink and downlink imbalance of the present invention: an adaptive system for uplink and downlink imbalance, comprising a wireless digital relay apparatus for wireless signal transmission with a base station and a terminal, respectively, through an antenna, the wireless digital relay apparatus comprising:
a first radio frequency transceiver module 11 for radio signal transmission with the base station 1,
a second RF transceiver module 21 for wireless signal transmission with the terminal 2,
for judging the signals received by the first radio frequency receiving and transmitting module 11 and the signals received by the second radio frequency receiving and transmitting module 21, and configuring an uplink transmitting channel to the FPGA processing module 3 of the appointed terminal,
the modulation and demodulation module 4 is used for demodulating the uplink and downlink signals to obtain physical layer information of the uplink and downlink signals and transmitting the physical layer information to the FPGA processing module 3;
the first rf transceiver module 11 is configured to perform wireless transmission with the base station 1 after passing through the first duplex filter 12 and the first antenna 13 in sequence, and the second rf transceiver module 21 is configured to perform wireless transmission with the terminal 2 after passing through the second duplex filter 22 and the second antenna 23 in sequence, where an uplink between the first duplex filter 12 and the first rf transceiver module 11 is serially connected with an amplifier, and a downlink between the second rf transceiver module 21 and the second duplex filter 22 is serially connected with an amplifier.
When the wireless digital relay device of the embodiment is used, downlink signals from a base station are received by a receiving antenna of the wireless digital relay device, filtered by a duplexer, then enter and exit a RF Transiver Unit radio frequency transceiver unit I, the received signals are subjected to frequency conversion, A/D conversion, amplification and the like in the unit I and then transmitted to RF Transiver Unit (a radio frequency transceiver unit II), and in the unit II, the signals are amplified by an amplifier, filtered by the duplexer and then transmitted to a terminal by an antenna after being subjected to a processing process which is opposite to the unit I; the uplink signal from the terminal is received by the receiving antenna of the wireless digital relay device, filtered by the duplexer, and then input into the RF Transiver Unit radio frequency receiving and transmitting unit II. In the second unit, the received signal is processed by frequency conversion, a/D conversion, amplification, etc., and then transmitted to RF Transiver Unit (radio frequency transceiver unit one), in the first unit, the received signal is amplified by an amplifier after being processed by the processing process which is inverse to that of the first unit, and then filtered by a duplexer, and then transmitted to the base station by an antenna.
Fig. 2 shows an embodiment of an adaptation method of uplink and downlink imbalance according to the present invention: an adaptive method for uplink and downlink imbalance, comprising the steps of:
a wireless digital relay device is configured between the base station and the terminal, the wireless digital relay device comprises a first radio frequency receiving and transmitting module, a second radio frequency receiving and transmitting module, an FPGA processing module and a modulation and demodulation module,
the FPGA processing module collects base stations and environmental parameters of a wireless signal coverage area, and carries out uplink and downlink budget according to the maximum gain configuration of the wireless digital relay equipment to respectively obtain the uplink and downlink coverage areas, wherein the maximum gain configuration reserves gain allowance;
the FPGA module calculates downlink fading and interference between the base station and the wireless digital relay equipment and path loss and interference on the same uplink path according to the information received by the first transceiver module and the second radio frequency transceiver module;
the FPGA module calculates the signal-to-noise ratio required by the arrival of the uplink data of each terminal at the receiving port of the base station receiver, which is required by the demodulation of the base station receiver, according to the acquired information;
the FPGA module calculates the signal strength required by the uplink output end of the wireless digital relay equipment;
and the FPGA module calculates the uplink digital gain in the wireless digital relay equipment according to the required signal intensity and configures the real-time amplification gain triggering the uplink data stream.
The uplink signal from the terminal is received by the receiving antenna of the wireless digital relay device, filtered by the duplexer, and then input into the RF Transiver Unit radio frequency receiving and transmitting unit II. In the second unit, the received signal is processed by frequency conversion, a/D conversion, amplification, etc., and then transmitted to RF Transiver Unit (radio frequency transceiver unit one), in the first unit, the received signal is amplified by an amplifier after being processed by the processing process which is inverse to that of the first unit, and then filtered by a duplexer, and then transmitted to the base station by an antenna.
The gain of the wireless digital relay device in the downlink direction can enhance the downlink coverage, and the gain of the wireless digital relay device in the downlink direction can enhance the downlink coverage; in general, if the benefit of the wireless digital relay device is not considered, the link budget is as shown in fig. 3, and in general, if the relay gain of the wireless digital relay device is not considered, the uplink and downlink links are ensured to be basically in a balanced state as far as possible according to the link budgets of the uplink parameters and the downlink parameters in the process of carrying out the link budget. Different wireless communication technologies have different uplink and downlink limited situations according to equipment capability and data transmission requirements. In the case of adding a wireless digital relay device, the improvement can be limited to a certain extent, but if the gain setting for the downlink signal and the uplink signal is not proper, the uplink-downlink balance will be further destroyed.
In the above embodiments, as preferred embodiments: the first radio frequency transceiver module 11 is used for transmitting wireless signals with the base station 1, the second radio frequency transceiver module 21 is used for transmitting wireless signals with the terminal 2, the FPGA processing module 3 is used for judging signals transmitted and received by the first radio frequency transceiver module 11 and signals transmitted and received by the second radio frequency transceiver module 21, an uplink transmitting channel is configured for the FPGA processing module 3 of a designated terminal, the modulation and demodulation module 4 is used for demodulating uplink and downlink signals to obtain physical layer information of the uplink and downlink signals and transmitting the physical layer information to the FPGA processing module 3, the first radio frequency transceiver module 11 is used for transmitting wireless signals with the base station 1 after sequentially passing through the first duplex filter 12 and the first antenna 13, the second radio frequency transceiver module 21 is used for transmitting wireless signals with the terminal 2 after sequentially passing through the second duplex filter 22 and the second antenna 23, an amplifier is connected in series with an uplink between the first duplex filter 12 and the first radio frequency transceiver module 11, and an amplifier is connected in series with a downlink between the second duplex filter 21 and the second duplex filter 22.
In the algorithm according to the present invention, it is first necessary to determine the downlink gain of the wireless digital relay device according to the target coverage of the downlink budget. Since the uplink is often limited in the personal communication network, a certain margin needs to be reserved when determining the downlink gain of the wireless digital relay device.
The gain value of the wireless digital relay device in the downlink direction is as follows:
G＝Gmax-M
where Gmax is the maximum gain of the wireless digital relay device in the uplink and downlink direction, and M is the downlink gain margin. The settings may be made according to different scenarios.
Based on the consideration of service models in different scenes, the downlink gain margin is recommended to be 5dB for a wide coverage scene, and the downlink gain margin is recommended to be 10dB for a deep coverage scene. The gain Yu Liangzhi is configurable and adjustable in the wireless digital relay device, and can be configured according to actual network scenarios or requirements.
A preferred embodiment of an adaptive method of uplink and downlink imbalance according to the present invention: and if the uplink limited transmission channel of the wireless communication network is limited, setting the uplink gain margin of the wireless digital relay device to be zero, setting the gain margin of the downlink gain to be 5dB outdoors and setting the indoor gain margin to be 10dB.
According to another preferred embodiment of the method for adapting to the imbalance of the uplink and the downlink of the present invention, as shown in fig. 4, the FPGA module calculates the downlink fading and interference between the base station and the wireless digital relay device, and the specific method is as follows: the modulation-demodulation module transmits the physical layer signal information to the FPGA module, and the FPGA calculates fading P-P0 of an uplink and downlink channel between the base station and the wireless digital relay device and corresponding interference factors P/SIR according to the received pilot channel power P, pilot channel signal-to-interference SIR ratio and initial power configuration P0 of a pilot channel of the base station.
The calculation flow chart of the uplink path loss and uplink path interference is shown in fig. 5:
for the FDD system, because the uplink and downlink data transmission frequencies are different, the influence caused by the difference of the uplink and downlink frequencies must be considered, and correction factors are given according to simulation data in different environments, and can also be corrected according to actual environment data;
for a TDD system, uplink and downlink data transmission are transmitted by using the same frequency point and different time slots, and then downlink channel loss and interference obtained by the algorithm in the third claim between the wireless digital relay device and the base station can be directly used as channel loss and interference of the uplink.
According to another preferred embodiment of the adaptive method for uplink and downlink imbalance of the present invention, the signal-to-noise ratio obtaining method is: the FPGA module obtains the uplink channel receiving power and the corresponding interference noise of each terminal according to the physical layer signal information transmitted by the modulation and demodulation module, and determines the signal-to-noise ratio required by the input end of the base station receiver according to the modulation mode of corresponding data.
According to one embodiment of the adaptive system for unbalanced uplink and downlink, the wireless digital relay device further comprises an abnormality alarm device, the abnormality alarm device comprises a 4G signal generator, a 4G signal receiver, a PIC processor and an audible and visual alarm, wherein the 4G signal generator is arranged in the wireless digital relay device and is connected with the FPGA processing module, the 4G signal receiver, the PIC processor and the audible and visual alarm are arranged in a duty room, the 4G signal receiver receives a 4G signal of the 4G signal generator and transmits the signal to the PIC processor, and the PIC processor starts the audible and visual alarm according to the 4G signal.
As the preferred embodiment, the two audible and visual alarms are arranged, one of the audible and visual alarms is arranged in the duty room, the other audible and visual alarm is arranged outside the duty room, the two audible and visual alarms and the PIC processor are connected through the single-pole double-pole switch, one active point of the single-pole double-pole switch is connected in series with an audible and visual alarm power supply circuit arranged in the duty room, and the other interactive point is connected in series with a parallel circuit of the two audible and visual alarms.
As a preferred embodiment, a light guide cover is arranged outside the prompting lamp of the outdoor audible and visual alarm, and the light guide cover is arranged on a lamp holder of the prompting lamp through a universal joint.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.
Claims (5)
1. A method for adapting to uplink and downlink imbalance, comprising the steps of:
a wireless digital relay device is configured between the base station and the terminal, the wireless digital relay device comprises a first radio frequency receiving and transmitting module, a second radio frequency receiving and transmitting module, an FPGA processing module and a modulation and demodulation module,
the FPGA processing module collects base stations and environmental parameters of a wireless signal coverage area, and carries out uplink and downlink budget according to the maximum gain configuration of the wireless digital relay equipment to respectively obtain the uplink and downlink coverage areas, wherein the maximum gain configuration is reserved with gain allowance;
the FPGA module calculates downlink fading and interference between the base station and the wireless digital relay equipment and path loss and interference on the same uplink path according to the information received by the first transceiver module (11) and the second radio frequency transceiver module (21);
the FPGA module calculates the signal-to-noise ratio required by the arrival of the uplink data of each terminal at the receiving port of the base station receiver, which is required by the demodulation of the base station receiver, according to the acquired information;
the FPGA module calculates the signal strength required by the uplink output end of the wireless digital relay equipment;
and the FPGA module calculates the uplink digital gain in the wireless digital relay equipment according to the required signal intensity and configures the real-time amplification gain triggering the uplink data stream.
2. An adaptive method for uplink and downlink imbalance according to claim 1, wherein: the radio frequency transceiver module I (11) and the base station (1) carry out wireless signal transmission, the radio frequency transceiver module II (21) and the terminal (2) carry out wireless signal transmission, the FPGA processing module (3) is used for judging signals transmitted and received by the radio frequency transceiver module I (11) and signals transmitted by the radio frequency transceiver module II (21), and configuring an uplink transmission channel to the FPGA processing module (3) of a designated terminal, the modulation demodulation module is used for demodulating uplink and downlink signals to obtain physical layer information of the uplink and downlink signals, and transmitting the physical layer information to the FPGA processing module (3), the radio frequency transceiver module I (11) carries out wireless transmission with the base station (1) after sequentially passing through the duplex filter I (12) and the antenna I (13), and the radio frequency transceiver module II (21) carries out wireless transmission with the terminal (2) after sequentially passing through the duplex filter II (22) and the antenna II (23), wherein an uplink between the duplex filter I (12) and the radio frequency transceiver module I (11) is connected in series with an amplifier, and the duplex filter II (22) is connected in series.
3. An adaptive method for uplink and downlink imbalance according to claim 1, wherein: and if the uplink limited transmission channel of the wireless communication network is limited, setting the uplink gain allowance of the wireless digital relay device to be zero, setting the gain allowance of the downlink gain to be 5dB outdoors and setting the indoor gain allowance to be 10dB.
4. An adaptive method for uplink and downlink imbalance according to claim 1, wherein: the FPGA module calculates downlink fading and interference between the base station and the wireless digital relay equipment, and the specific method is as follows: the modulation-demodulation module transmits the physical layer signal information to the FPGA module, and the FPGA calculates fading P-P0 of a link uplink and downlink channel between the base station and the wireless digital relay device and corresponding interference factors P/SIR according to the received pilot channel power P, pilot channel signal-to-interference ratio and initial power configuration P0 of a pilot channel of the base station.
5. An adaptive method for uplink and downlink imbalance according to claim 1, wherein: the signal-to-noise ratio acquisition method comprises the following steps: the FPGA module obtains the uplink channel receiving power and the corresponding interference noise of each terminal according to the physical layer signal information transmitted by the modulation and demodulation module, and determines the signal-to-noise ratio required by the input end of the base station receiver according to the modulation mode of corresponding data.
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| CN108696927A (en) * | 2018-05-26 | 2018-10-23 | 四川省大见通信技术有限公司 | Digital junction equipment and the method for wireless network non-blind area covering and reducing power consumption |
| CN109104232B (en) * | 2018-09-25 | 2021-03-16 | 中国联合网络通信集团有限公司 | Wireless relay equipment and wireless communication system |
| CN110430580A (en) * | 2019-08-30 | 2019-11-08 | 超讯通信股份有限公司 | A kind of 5G indoor coverage equipment and its signal processing method |
| CN113038501B (en) * | 2019-12-24 | 2022-08-05 | 中国移动通信集团四川有限公司 | Network link optimization method and device and electronic equipment |
| CN111866899A (en) * | 2020-06-28 | 2020-10-30 | 四川省大见通信技术有限公司 | Indoor microdistribution system and method for 5G mobile communication |
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| CN101754480A (en) * | 2010-02-03 | 2010-06-23 | 西安交通大学 | Global system for mobile communication (GSM) repeater and self-adaption interference cancellation method thereof |
| CN102480778A (en) * | 2010-11-25 | 2012-05-30 | 无锡励睿科技有限公司 | Method and system for setting forward and reverse link gain through physical-layer relay |
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| CN206135915U (en) * | 2016-11-10 | 2017-04-26 | 张华� | Distributing type thing networking radio signal reinforcing means |
| CN106993293A (en) * | 2017-05-04 | 2017-07-28 | 陕西天基通信科技有限责任公司 | Broadband multi-frequency gain balance equipment, compartment system and location mode |
| CN207251924U (en) * | 2017-09-27 | 2018-04-17 | 四川省大见通信技术有限公司 | A kind of unbalanced Adaptable System of uplink downlink |
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