CN116938292B

CN116938292B - MIMO communication system and control method for feed-in signals at two ends of leaky cable

Info

Publication number: CN116938292B
Application number: CN202311199366.1A
Authority: CN
Inventors: 林垄龙; 徐彬彬; 赵云琨; 张嘉烽; 赵瑞静; 徐宗铭; 王斌
Original assignee: Zhongtian Radio Frequency Cable Co ltd; Jiangsu Zhongtian Technology Co Ltd
Current assignee: Zhongtian Radio Frequency Cable Co ltd; Jiangsu Zhongtian Technology Co Ltd
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2023-11-28
Anticipated expiration: 2043-09-18
Also published as: CN116938292A

Abstract

The application belongs to the technical field of mobile communication, and provides a MIMO communication system and a control method for feeding signals at two ends of a leaky cable, which can realize 2X 2 MIMO, 4X 4 MIMO, 8X 8 MIMO and the like by feeding different signals from two ends of a single leaky cable, can save space, reduce the cost of the system and improve the user perception rate of a network; the problem that the mobile terminal receives large difference and is difficult to process due to the fact that the signal non-uniformity of the two-way signal exists can be solved by means of the additionally arranged signal controller, the positioning base station and the corresponding signal intensity adjustment control method, the system can control the change of the input leaky cable signal intensity in real time according to the position of the terminal, the two-way signal intensity received by the terminal is controlled in the equipment processing range, and the communication quality is guaranteed.

Description

MIMO communication system and control method for feed-in signals at two ends of leaky cable

Technical Field

The application relates to the technical field of mobile communication, in particular to a MIMO communication system and a control method for feeding signals to two ends of a leaky cable.

Background

MIMO (multiple input multiple output) of the new generation communication system physical layer core technology brings about a great improvement in spectral efficiency and throughput. The current widely used leakage cable coverage scheme adopts a mode that each path of output corresponds to one leakage cable for communication, and each path of signal after baseband digital signal processing is modulated to radio frequency and then fed to each single leakage cable through a feeder for radiation. The laying of a plurality of leakage cables entails a great deal of cost investment, and simultaneously, the engineering difficulty is increased. Meanwhile, a plurality of same polarized leaky cables are used for realizing the MIMO system, the requirement on the space between the leaky cables is high, and if the space between adjacent leaky cables does not meet the space isolation requirement, the MIMO capacity is seriously affected. However, in the limited installation space of the rail transit, various cables and devices such as a subway dedicated cable, a police cable, an optical cable rack and the like are required to be installed, and a certain installation distance is also required between cables of different wireless communication systems in order to avoid interference, so that the installation space of the cable is limited, the spacing distance must be satisfied, and deployment of a plurality of MIMO systems with the spacing distance of more than 2×2 is difficult to realize.

Disclosure of Invention

In view of the above, the present application is directed to a MIMO communication system and a control method for feeding signals to two ends of a leaky cable.

In a first aspect, an embodiment of the present application provides a MIMO communication system for feeding signals to two ends of a leaky cable, where the MIMO communication system includes a first POI, a first signal controller, a first RRU, a first positioning base station, a second POI, a second signal controller, a second RRU, a second positioning base station, and at least one leaky cable; the first end signal of the leaky cable is connected with a first POI, the first POI signal is connected with a first signal controller, the first signal controller is connected with a first RRU and a first positioning base station, the second end signal of the leaky cable is connected with a second POI, the second POI signal is connected with a second signal controller, and the second signal controller is connected with a second RRU and a second positioning base station; the PCI (physical cell identifier) of the first RRU and the PCI of the second RRU are set to be the same; the first signal controller or the second signal controller is used for acquiring the position information of the mobile terminal from a positioning base station connected with the first signal controller or the second signal controller through signals, calculating the lengths of the mobile terminal, which are away from the first end and the second end of the target leaky cable, along the extending direction of the target leaky cable according to the position information, and calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the target leaky cable at the mobile terminal according to the lengths of the mobile terminal, which are away from the first end and the second end of the target leaky cable, along the extending direction of the target leaky cable and the attenuation constant of the target leaky cable; wherein the target leaky cable belongs to the at least one leaky cable; the first signal controller is used for responding to the signal intensity difference to be larger than a preset difference threshold value, adjusting the signal intensity of a first signal fed into the first end of the at least one leaky cable, and/or the second signal controller is used for responding to the signal intensity difference to be larger than the preset difference threshold value, and adjusting the signal intensity of a second signal fed into the second end of the at least one leaky cable, so that the signal intensity difference is smaller than or equal to the preset difference threshold value.

In some embodiments, the first signal controller and the second signal controller each comprise an attenuator, an amplifier, and a control circuit; the control circuit is in signal connection with the attenuator or the amplifier, and the attenuator and the amplifier are connected in series.

In some embodiments, the first signal controller and the second signal controller each further comprise a switching circuit, the control circuit is in signal connection with the switching circuit, and the switching circuit is in signal connection with a gating switch corresponding to the attenuator and/or a gating switch corresponding to the amplifier.

In some embodiments, at least two of the leaky cables are arranged, and the radiation polarization directions between every two adjacent leaky cables are different.

In some embodiments, the radiation polarization direction of the leaky cable is vertical polarization, horizontal polarization, +45° polarization, or-45 ° polarization.

In a second aspect, the present application provides a MIMO communication control method for feeding signals to two ends of a leaky cable, including the following steps: setting PCI (physical cell identification) of RRUs (remote radio units) at two ends of a leaky cable to be the same; acquiring position information of a mobile terminal, and calculating lengths of the mobile terminal, which are away from a first end and a second end of a leaky cable, along the extension direction of the leaky cable according to the position information; calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the leaky cable at the mobile terminal according to the lengths of the first end and the second end of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable; and adjusting the signal intensity of a first signal fed into the first end of the leaky cable or the signal intensity of a second signal fed into the second end of the leaky cable according to the fact that the signal intensity difference is larger than a preset difference threshold value, so that the signal intensity difference between the first signal and the second signal received by the mobile terminal is not larger than the preset difference threshold value.

In some embodiments, the communication control method further comprises the steps of: according to the fact that the signal intensity difference is larger than a preset difference threshold value, and the length of the mobile terminal, along the extension direction of the leaky cable, from the first end of the leaky cable is larger than the length of the mobile terminal, along the extension direction of the leaky cable, from the second end of the leaky cable, the first signal fed into the first end of the leaky cable is amplified in signal intensity, or the second signal fed into the second end of the leaky cable is attenuated in signal intensity; according to the signal intensity difference being larger than the preset difference threshold, and the length of the mobile terminal along the extension direction of the leaky cable from the first end of the leaky cable being smaller than the length of the mobile terminal along the extension direction of the leaky cable from the second end of the leaky cable, and carrying out signal intensity attenuation on the first signal fed into the first end of the leakage cable or carrying out signal intensity amplification on the second signal fed into the second end of the leakage cable.

In some embodiments, calculating the length of the mobile terminal in the direction of extension of the leaky cable from the first end of the leaky cable and the second end of the leaky cable further comprises the steps of: acquiring position information of a mobile terminal, position information of a first end of a leaky cable and position information of a second end of the leaky cable; calculating the length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, according to the position information of the mobile terminal and the position information of the first end of the leaky cable; calculating the length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable, according to the position information of the mobile terminal and the position information of the second end of the leaky cable; or comprises the steps of: acquiring position information of a mobile terminal and position information of a first end of a leaky cable, calculating the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable according to the position information of the mobile terminal and the position information of the first end of the leaky cable, and calculating the length of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable according to the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable; or comprises the steps of: acquiring position information of a mobile terminal and position information of a leaky cable second end, calculating the length of the mobile terminal, which is away from the leaky cable second end and is along the leaky cable extending direction, according to the position information of the mobile terminal and the position information of the leaky cable second end, and calculating the length of the mobile terminal, which is away from the leaky cable first end and is along the leaky cable extending direction, according to the length of the mobile terminal, which is away from the leaky cable second end and is along the leaky cable extending direction.

In some embodiments, the multiple or attenuation of the signal strength of the first signal or the second signal is related to a difference in length of the mobile terminal from the first end and the second end of the leaky cable along the extension direction of the leaky cable.

In some embodiments, the preset variance threshold is at most 20dB.

The application has the beneficial effects.

The MIMO communication system and the control method for feeding signals at two ends of the leaky cable can realize 2X 2 MIMO, 4X 4 MIMO, 8X 8 MIMO and the like by feeding different signals from two ends of a single leaky cable, can save space, reduce the cost of the system and improve the user perception rate of a network; the problem that the mobile terminal receives large difference and is difficult to process due to the fact that the signal imbalance exists in the two-way signal by means of the additionally arranged signal controller, the positioning base station and the corresponding signal intensity adjustment control method can be solved, the system can control the change of the input leaky cable signal intensity in real time according to the position of the terminal, the two-way signal intensity received by the terminal is controlled in the equipment processing range, and the communication quality is guaranteed.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 application 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 shows a schematic diagram of a 2×2 MIMO system with two feed signals at two ends of a leaky cable according to the application;

FIG. 2 is a schematic diagram showing a mobile terminal in a position covered by a leaky cable according to the application;

fig. 3 is a schematic flow chart of a MIMO communication control method of feeding signals to two ends of a leaky cable according to the application;

FIG. 4 is a schematic diagram showing the structure of a signal controller according to the present application;

FIG. 5 shows a schematic diagram of an attenuator of a signal controller according to the present application;

FIG. 6 shows a schematic diagram of an amplifier structure of a signal controller according to the present application;

FIG. 7 is a schematic diagram showing the structure of a signal controller with a switching circuit according to the present application;

FIG. 8 shows a schematic diagram of a signal controller of the present application having a plurality of amplifiers and attenuators in series with a switching circuit;

Fig. 9 shows a schematic diagram of a 4×4 MIMO system with two-end feed signals of the leaky cable according to the application;

fig. 10 shows a schematic diagram of an 8×8 MIMO system with two-end feed signals of the leaky cable according to the application;

fig. 11 is a schematic structural diagram of a first signal controller of a MIMO communication control apparatus of the present application, in which signals are fed into two ends of a leaky cable;

fig. 12 is a schematic structural diagram of a second signal controller of a MIMO communication control apparatus according to the present application.

Wherein: the signal strength difference adjustment module comprises a 1-first POI, a 2-first signal controller, a 3-first RRU, a 4-first positioning base station, a 5-second positioning base station, a 6-second POI, a 7-second signal controller, an 8-second RRU, a 9-leaky cable, a 10-control circuit, an 11-attenuator, a 12-amplifier, a 13-storage module, an A-leaky cable first end, a B-leaky cable second end, a 14-mobile terminal, a length between a y-leaky cable first end and the mobile terminal along the extension direction of the leaky cable, a length between the L-y-leaky cable second end and the mobile terminal along the extension direction of the leaky cable, a 15-first fixed attenuator, a 16-second fixed attenuator, a 17-first adjustable attenuator, an 18-second adjustable attenuator, a 19-first operational amplifier, a 20-second operational amplifier, a 21-third operational amplifier, a 22-switching circuit, a 23-gating switch, a 24-first leaky cable, a 25-second leaky cable, a 26-third leaky cable, a 27-fourth leaky cable, a first signal strength adjustment module and a second signal strength adjustment module 31.

Detailed Description

The term "comprising" in the description of the application and in the claims and in the drawings is synonymous with "including", "containing" or "characterized by", and is inclusive or open-ended and does not exclude additional unrecited elements or method steps. "comprising" is a technical term used in claim language to mean that the recited element is present, but other elements may be added and still form a construct or method within the scope of the recited claims.

It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance. The term "about" in the present application is meant to encompass minor variations (up to +/-10%) from the stated values.

The application has found that the current widely used leakage cable covering scheme adopts a mode that each output corresponds to one leakage cable for communication, and the laying of a plurality of leakage cables inevitably brings a great deal of cost investment and also increases engineering difficulty. Meanwhile, a plurality of same polarized leaky cables are used for realizing the MIMO system, the requirement on the space between the leaky cables is high, and if the space between adjacent leaky cables does not meet the space isolation requirement, the MIMO capacity is seriously affected. In addition, the limited installation space of the rail transit also needs to install various cables and equipment such as a special cable for subways, a police cable for subways, an optical cable rack and the like, and a certain installation distance is also needed between cables of different wireless communication systems to avoid interference, so that the installation space of the cable for subways is limited, the spacing distance also needs to be met, and the deployment of a plurality of MIMO systems with the distance of more than 2×2 is difficult to realize. In addition, the application discovers that the same leaky cable double-channel signal has signal non-uniformity, the strength of the two channels of signals received by the control terminal can be greatly different, even the strength of the two channels of signals exceeds the processing capacity of the mobile terminal, and the performance of MIMO communication is affected.

In view of this, the embodiment of the application provides a MIMO communication control method for feeding signals to two ends of a leaky cable, which includes the following steps: setting PCI (physical cell identification) of RRUs (remote radio units) at two ends of a leaky cable to be the same; acquiring position information of a mobile terminal, and calculating lengths of the mobile terminal, which are away from a first end and a second end of a leaky cable, along the extension direction of the leaky cable according to the position information; calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the leaky cable at the mobile terminal according to the lengths of the first end and the second end of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable; according to the fact that the signal intensity difference is larger than a preset difference threshold, the length of the mobile terminal, along the extension direction of the leaky cable, from the first end of the leaky cable is larger than the length of the mobile terminal, along the extension direction of the leaky cable, from the second end of the leaky cable, the signal intensity of a first signal fed into the first end of the leaky cable is amplified, or the signal intensity of a second signal fed into the second end of the leaky cable is attenuated, and the difference of the signal intensities of the first signal and the second signal received by the mobile terminal is not larger than the preset difference threshold; according to the signal intensity difference being larger than the preset difference threshold, and the length of the mobile terminal along the extension direction of the leaky cable from the first end of the leaky cable being smaller than the length of the mobile terminal along the extension direction of the leaky cable from the second end of the leaky cable, and carrying out signal intensity attenuation on a first signal fed into the first end of the leakage cable or carrying out signal intensity amplification on a second signal fed into the second end of the leakage cable, so that the difference of the signal intensities of the first signal and the second signal received by the mobile terminal is not greater than a preset difference threshold value.

According to the MIMO communication system and the control method adopting the feed-in signals at the two ends of the leaky cable, which are provided by the embodiment, different signals can be fed in from the two ends of a single leaky cable to realize the MIMO system, so that the space can be saved, the cost of the system can be reduced, and the user perception rate of a network can be improved; and by means of the additionally arranged signal controller, the positioning base station and corresponding signal intensity adjustment control, the problems that the mobile terminal receives large difference and is difficult to process due to signal imbalance of the two-way signal can be solved, the system can control the change of the input leaky cable signal intensity in real time according to the position of the terminal, and then control the two-way signal intensity received by the terminal in the equipment processing range, so that the communication quality is ensured.

In some embodiments, a single leaky cable may be employed to form a single cable 2×2 MIMO. In some embodiments, two cables may be used to form a 4×4 MIMO, with the radiation polarization directions of adjacent leaky cables being different, the two cables having four polarization spatial polarization directions, the spatial polarization isolation being higher and MIMO being better than adjacent like polarized leaky cables. In some embodiments, four cables may be used to form 8×8 MIMO, thus further increasing system capacity. When more than two leaky cables are arranged, the radiation polarization directions of adjacent leaky cables can be different, so that the coherence of signals is reduced, the quality of the signals is improved, the requirement on the distance between the leaky cables is reduced, and the space is saved.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Example 1

Mobile communication continues the development rule of every ten years of technology, has undergone the development of 1G, 2G, 3G, 4G and 5G, and each time of transition, each time of technology progress greatly promotes the industry upgrade and economic and social development. Mobile communication has become an indispensable component in people's daily life, and coverage of civil communication systems has become increasingly important in the construction of urban rail transit.

The leakage cable has good uniform radiation characteristic, and is widely applied to linear coverage communication scenes such as roadways, underground passages, mines and tunnels. MIMO (multiple input multiple output) of the new generation communication system physical layer core technology brings about a great improvement in spectral efficiency and throughput. The current widely used leakage cable coverage scheme adopts a mode that each path of output corresponds to one leakage cable for communication, and each path of signal after baseband digital signal processing is modulated to radio frequency and then fed to each single leakage cable through a feeder for radiation. The laying of a plurality of leakage cables entails a great deal of cost investment, and simultaneously, the engineering difficulty is increased. Meanwhile, a plurality of same polarized leaky cables are used for realizing the MIMO system, the requirement on the space between the leaky cables is high, and if the space between adjacent leaky cables does not meet the space isolation requirement, the MIMO capacity is seriously affected. However, in the limited installation space of the rail transit, various cables and devices such as a subway dedicated cable, a police cable, an optical cable rack and the like are required to be installed, and a certain installation distance is also required between cables of different wireless communication systems in order to avoid interference, so that the installation space of the cable is limited, the spacing distance must be satisfied, and deployment of a plurality of MIMO systems with the spacing distance of more than 2×2 is difficult to realize.

The application provides a MIMO system adopting feed signals at two ends of a leaky cable, when PCI (physical cell identification) of RRU (remote radio unit) at two ends of the leaky cable are the same, signals are fed from two ends of the leaky cable 9 at the same time, two paths of signals are fed from two ends of the leaky cable 9, radiation angles of two paths of signal spaces are different, and when a terminal can receive two paths of leaky cable signals at the same time, single cable 2X 2 MIMO can be formed, so that the 2X 2 MIMO function is realized by utilizing a single leaky cable.

As shown in fig. 1, the MIMO communication system employing signals fed from two ends of a leaky cable includes a first POI 1, a first signal controller 2, a first RRU3, a first positioning base station 4, a second POI 6, a second signal controller 7, a second RRU 8, a second positioning base station 5, and at least one leaky cable 9. The first end signal connection first POI 1 of weeping cable 9, first POI 1 signal connection first signal controller 2, first RRU3 and first positioning base station 4 are connected to first signal controller 2 signal, the second end signal connection second POI 6 of weeping cable 9, second POI 6 signal connection second signal controller 7, second RRU 8 and second positioning base station 5 are connected to second signal controller 7 signal. The PCI (physical cell identity) of the first RRU3 and the second RRU 8 can be set to be the same.

Referring to fig. 1 and fig. 2 together, the first signal controller 2 is configured to obtain location information of the mobile terminal 14 from the first positioning base station 4, and calculate lengths of the mobile terminal 14 from the first end and the second end of the leaky cable along the extension direction of the leaky cable according to the location information; the method is further used for calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the leaky cable at the mobile terminal 14 according to the lengths of the mobile terminal 14 from the first end and the second end of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable; the method is also used for judging whether the signal intensity difference is larger than a preset difference threshold value or not and judging whether the length of the user terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, is larger than the length of the user terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable or not; and is configured to determine that the signal strength difference is greater than a preset difference threshold, and that the length of the mobile terminal 14 in the direction of extension of the leaky cable from the first end of the leaky cable is greater than the length of the mobile terminal 14 in the direction of extension of the leaky cable from the second end of the leaky cable, amplifying the signal intensity of the first signal fed into the first end of the leaky cable to enable the signal intensity difference received by the mobile terminal 14 to be smaller than a preset difference threshold; or the method is used for carrying out signal intensity attenuation on the first signal fed into the first end of the leaky cable according to the condition that the signal intensity difference is larger than a preset difference threshold value and the length of the mobile terminal 14, along the extension direction of the leaky cable, from the first end of the leaky cable is smaller than the length of the mobile terminal 14, along the extension direction of the leaky cable, from the second end of the leaky cable, so that the signal intensity difference received by the mobile terminal 14 is smaller than the preset difference threshold value.

The second signal controller 7 is configured to obtain location information of the mobile terminal 14 from the second positioning base station 5, and calculate lengths of the mobile terminal 14 from the first end and the second end of the leaky cable along the extension direction of the leaky cable according to the location information; the method is further used for calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the leaky cable at the mobile terminal 14 according to the lengths of the mobile terminal 14 from the first end and the second end of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable; the method is also used for judging whether the signal intensity difference is larger than a preset difference threshold value or not and judging whether the length of the user terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, is larger than the length of the user terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable or not; the method comprises the steps of carrying out signal intensity attenuation on a second signal fed into a second end of a leaky cable according to the fact that the signal intensity difference is larger than a preset difference threshold, and the length of the mobile terminal 14, along the leaky cable extending direction, from the first end of the leaky cable is larger than the length of the mobile terminal 14, along the leaky cable extending direction, from the second end of the leaky cable, so that the signal intensity difference received by the mobile terminal 14 is smaller than the preset difference threshold; or the signal intensity difference is larger than a preset difference threshold, and the length of the mobile terminal 14 along the extension direction of the leaky cable from the first end of the leaky cable is smaller than the length of the mobile terminal 14 along the extension direction of the leaky cable from the second end of the leaky cable, so that the signal intensity difference received by the mobile terminal 14 is smaller than the preset difference threshold.

As shown in fig. 2, the length y of the mobile terminal 14 in the direction of extension of the leaky cable from the first end a of the leaky cable and the length L-y of the mobile terminal in the direction of extension of the leaky cable from the second end of the leaky cable. Attenuation constants of the drain cable, such as 7.3dB/100m, 9.2dB/100m, 19.8dB/100m, etc.

As shown in fig. 1, the first RRU3 and the second RRU8 are set as super cells (feeder cells), i.e. have the same PCI (Physical Cell Identifier, physical Cell identity). The super Cell configures 2 or more RRUs or sectors into a logic Cell, has the same Cell ID, and performs uniform resource scheduling. In high-speed moving scenes such as high-speed rail coverage, route coverage and the like, the number of cells is reduced through super cells, the range of a single cell is enlarged, switching is reduced, and communication reliability is guaranteed.

The simultaneous feed-in signal from both ends of a single leaky cable is different from the double leaky cable case, different radio frequency signals radiate from each identical slot and share multiple spatial channels. The RRU (remote radio unit) and the BBU (Building Baseband Unite, indoor baseband processing unit) transmit signals through optical fibers, and the BBU is generally placed in a communication machine room in a centralized manner. The RRU (remote radio unit) comprises at least one RRU of an operator, such as a telecom 2G/3G/4G RRU, a mobile 2G/3G/4G RRU, a telecom 5G RRU and a mobile 5G RRU. RRU (remote radio unit) signals are connected to a POI (multi-system combining platform), which is connected to one end of leaky cable 9, as shown in fig. 1, a first RRU3 signal is connected to a first POI 1, a first POI 1 signal is connected to a first end of leaky cable 9, a second RRU8 signal is connected to a second POI 6 signal, and a second POI 6 signal is connected to a second end of leaky cable 9.

In other embodiments, there may also be a coupler between the first POI 1 or the second POI 6 and the leaky cable 9 (the coupler is provided to facilitate signal transmission to the lobby or station via which the signal is transmitted to a different leaky cable via the power divider) and the power divider, or simply transmitted to the leaky cable 9 via the power divider, depending on the needs of the network deployment.

In the application, it has been found that the signal non-uniformity exists in the same two-way signal of the leaky cable, so that by adding a signal controller, the change of the signal strength of the input leaky cable can be controlled in real time according to the position of the terminal, and thus the two-way signal strength received by the terminal is controlled in the processing range of the device, for example, in some embodiments, the difference of the two-way real-time signal strength is 8dB at the maximum. As shown in fig. 1, a first signal controller 2 is provided between the first RRU 3 and the first POI 1, and a second signal controller 7 is provided between the second RRU 8 and the second POI 6. When the signal controller is positioned between the RRU and the POI, the use frequency band of the signal controller only needs to cover the frequency band of the input RRU, the input power of the signal controller only needs to bear the power output by the access RRU, the installation and construction are convenient, and the signal controller can be installed between the corresponding RRU and the POI according to the requirement.

As shown in fig. 2, the leaky cable 9 has a leaky cable first end a and a leaky cable second end B, between which is a length section of the leaky cable, the length of which is L, for example, 400-600m in a subway tunnel scene. Different signals are fed from both ends a and B, between which the mobile terminal 14 (user equipment such as a cell phone) is located. If the mobile terminal 14 is located just in the middle of the two ends a and B, there is no difference in the two paths of real-time signal strength. If the mobile terminal 14 is located elsewhere between a and B, there is a difference in the two paths of real-time signal strength. The two paths of signal strengths received by the mobile terminal 14 should be controlled within the processing range of the device, for example, the two paths of real-time signal strengths differ by 8dB at maximum. Y denotes a length in the drain cable extending direction between the drain cable first end a and the mobile terminal 14, and L-y denotes a length in the drain cable extending direction between the drain cable second end B and the mobile terminal 14 as shown in fig. 2. The attenuation constant of the leaky cable is alpha.

If y>L-y, i.e. L-2y<0, then the mobile terminal 14 is closer to the leaky cable second end B, the signal strength difference at said mobile terminal 14 of the radiated signal of the leaky cable first end a and second end B input signals is α(2 y-L), then in order to make the difference between the two signal strengths received by the mobile terminal within the allowable range, the signal strength of the first signal path should be amplified before the signal is input to the first end A of the leaky cable, or the signal strength of the second signal path should be attenuated before the signal is input to the second end B of the leaky cable, or the signal strength of the first signal path should be amplified before the signal is input to the first end A of the leaky cable, and the signal strength of the second signal path should be amplified at the same time The second end B of the cable is preceded by a signal strength decay.

If y<L-y, i.e. L-2y>0, then the mobile terminal 14 is closer to the leaky cable first end a, the difference in signal strength at said mobile terminal 14 between the radiated signals of the leaky cable first end a and second end B input signals is alpha(L-2 y), then in order to make the difference between the two signal strengths received by the mobile terminal within the allowable range, the signal strength of the first signal before being input to the first end a of the leaky cable should be attenuated, or the signal strength of the second signal before being input to the second end B of the leaky cable should be increased, or the signal strength of the first signal before being input to the first end a of the leaky cable should be attenuated, and the signal strength of the second signal before being input to the second end B of the leaky cable should be increased.

The embodiment of the application provides a MIMO communication control method using feed-in signals at two ends of a leaky cable, in which 2 or more RRU devices are required to be configured into the same cell, and PCI (physical cell identifier) of RRU (remote radio unit) at two ends of the leaky cable is required to be set the same, and the method comprises the following steps, as shown in a flowchart in fig. 3:

s01: acquiring position information of a mobile terminal, and calculating and acquiring the length y of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, and the length L-y of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable according to the position information;

S02: calculating a signal intensity difference alpha of radiation signals of input signals of the first end and the second end of the leaky cable at the mobile terminal according to the lengths of the mobile terminal, which are away from the first end and the second end of the leaky cable, along the extension direction of the leaky cable and the attenuation constant of the leaky cable(L-2 y) or alpha->（2y-L）；

S03: judging whether the signal intensity difference is larger than a preset difference threshold value or not; if the signal strength difference is smaller than or equal to a preset difference threshold value, the input signal strength at the two ends of the leaky cable does not need to be adjusted, and the signal strength difference received by the mobile terminal is within the signal processing tolerance range of the mobile terminal, so that the signal receiving is not influenced; ending the steps; if the signal intensity difference is greater than the preset difference threshold, step S04 is carried out to adjust the intensity of the input signals at the two ends of the leakage cable;

s04: the signal intensity difference is larger than a preset difference threshold value, the mobile terminal is not necessarily positioned at the midpoint of the leaky cable, and whether the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable is larger than the length of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable is judged at the moment; if yes, go to step S05; if not, go to step S06;

s05: according to the fact that the length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, is larger than the length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable, the first signal fed into the first end of the leaky cable is amplified in signal intensity or the second signal fed into the second end of the leaky cable is attenuated in signal intensity, and the difference of the signal intensities received by the mobile terminal is smaller than a preset difference threshold value; ending the steps;

S06: according to the fact that the length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, is smaller than the length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable, the first signal fed into the first end of the leaky cable is subjected to signal intensity attenuation or the second signal fed into the second end of the leaky cable is subjected to signal intensity amplification, and the difference of the signal intensities received by the mobile terminal is smaller than a preset difference threshold value; the step ends.

In the application, the first signal controller 2 and the second signal controller 7 are different devices with the same function, communication or signal exchange can be omitted between the two devices, and the lengths of the mobile terminal, which are away from the first end and the second end of the leaky cable and are along the extension direction of the leaky cable, can be respectively obtained only by virtue of the positioning base station connected with the two devices. For example, in some embodiments, the step S01 of obtaining the length of the mobile terminal in the direction of extension of the leaky cable from the first end of the leaky cable and the length of the mobile terminal in the direction of extension of the leaky cable from the second end of the leaky cable further includes the steps of: acquiring position information of a mobile terminal, position information of a first end of a leaky cable and position information of a second end of the leaky cable, calculating the length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, according to the position information of the mobile terminal and the position information of the second end of the leaky cable, and calculating the length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable.

For example, in some embodiments, the step S01 of obtaining the length of the mobile terminal in the direction of extension of the leaky cable from the first end of the leaky cable and the length of the mobile terminal in the direction of extension of the leaky cable from the second end of the leaky cable further includes the steps of: acquiring position information of a mobile terminal and position information of a first end of a leaky cable, calculating the length y of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable according to the position information of the mobile terminal and the position information of the first end of the leaky cable, and calculating the length L-y of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable according to the length y of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable and the length L of the leaky cable.

Specifically, the first signal controller 2 is configured to obtain a length of the mobile terminal, which is away from a first end of the leaky cable and is along the leaky cable extending direction, and a length of the mobile terminal, which is away from a second end of the leaky cable and is along the leaky cable extending direction, and includes the steps of: acquiring position information of a first end of the leaky cable and position information of a mobile terminal from a first positioning base station 4, and calculating the length y of the mobile terminal from the first end of the leaky cable along the extension direction of the leaky cable according to the position information of the mobile terminal and the position information of the first end of the leaky cable; and calculating the length L-y of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable according to the length y of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable and the length L of the leaky cable.

For example, in some embodiments, the step S01 of obtaining the length of the mobile terminal in the direction of extension of the leaky cable from the first end of the leaky cable and the length of the mobile terminal in the direction of extension of the leaky cable from the second end of the leaky cable further includes the steps of: the method comprises the steps of obtaining position information of a mobile terminal and position information of a leaky cable second end, calculating the length of the mobile terminal, along the leaky cable extending direction, of the leaky cable second end according to the position information of the mobile terminal and the position information of the leaky cable second end, and calculating the length of the mobile terminal, along the leaky cable extending direction, of the leaky cable first end according to the length of the mobile terminal, along the leaky cable extending direction, of the leaky cable second end and the leaky cable length L.

Specifically, the second signal controller 7 is configured to obtain a length of the mobile terminal from the second end of the leaky cable along the extension direction of the leaky cable and a length of the mobile terminal from the first end of the leaky cable along the extension direction of the leaky cable, and includes the steps of: acquiring the position information of the second end of the leaky cable and the position information of the mobile terminal from the second positioning base station 5, and calculating the length L-y, along the extension direction of the leaky cable, of the mobile terminal from the second end of the leaky cable according to the position information of the mobile terminal and the position information of the second end of the leaky cable; and calculating the length y of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable according to the length L-y of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable and the length L of the leaky cable.

The preset difference threshold in steps S04 and S05 is at most 20dB, and may be, for example, 20dB, 19dB, 18dB, 17dB, 16dB, 15dB, 14dB, 13dB, 12dB, 11dB, 10dB, 9dB, 8dB, 7.5dB, 7dB, 6.5dB, 6dB, 5.5dB, 5dB, 4.5dB, 4dB, 3.5dB, 3dB, etc. in some embodiments.

As shown in fig. 4, in some embodiments of the application, the signal controller includes an attenuator, an amplifier, and a control circuit. In some embodiments, the attenuation maximum of the attenuator is greater than or equal to the maximum amplification gain of the amplifier. For example, the first signal controller 2 (or the second signal controller 7) includes a control circuit 10, an attenuator 11, and an amplifier 12, and the control circuit 10 is connected to the attenuator 11, and the attenuator 11 and the amplifier 12 are connected in series. A storage module 13 is disposed in the control circuit 10, and a preset attenuation value related to a difference between the signal input ends (a and B ends) of the leaky cable 9 and a distance between the mobile terminal 14 (user equipment such as a mobile phone) along the extension direction of the leaky cable is disposed in the storage module 13.

An Attenuator (Attenuator) is an electronic component that provides attenuation, widely used in electronic devices, for reducing the amplitude or power of a signal, by attenuating the energy of the input signal, to reduce the amplitude of its output signal to a desired level. The attenuator is classified into a fixed attenuator and an adjustable attenuator. In some embodiments, the attenuator 11 employs a digitally controlled attenuator having an attenuation value ranging from 0dB to 31.5dB, the digitally controlled attenuator being a 0.5dB step, and a maximum attenuation of 31.5dB, the digitally controlled attenuator attenuating the signal input to the POI (e.g., the first POI 1) to thereby adjust the signal strength of the cable leakage radiation.

In other embodiments, the attenuator 11 may employ a hybrid arrangement of a fixed attenuator and an adjustable attenuator. In some embodiments, the attenuator 11 includes two or more attenuators that are alternately arranged, wherein the attenuators include a fixed attenuator and an adjustable attenuator. As shown in fig. 5, the attenuator 11 includes a first fixed attenuator 15, a first adjustable attenuator 17, a second fixed attenuator 16, and a second adjustable attenuator 18 alternately arranged. The control circuit 10 is connected to the first adjustable attenuator 17 and to the second adjustable attenuator 18, and the attenuation value of the adjustable attenuators can be adjusted.

Amplifiers, i.e. operational amplifiers (simply "op amps"), are circuit units with very high amplification factors, which are very widely used. As shown in fig. 4, the attenuator 11 is connected in series with the amplifier 12. The amplifier 12 of the present application may be a fixed-factor amplifier or an adjustable amplifier. In some embodiments, the amplifier 12 is a digitally controlled amplifier with adjustable amplification factor, the control circuit 10 may be connected to the amplifier 12, a storage module 13 is disposed in the control circuit 10, and a preset amplification factor related to a difference between the signal input ends (a and B ends) of the leaky cable 9 and the distance between the mobile terminal 14 (user equipment such as a mobile phone) along the extension direction of the leaky cable is disposed in the storage module 13.

In some embodiments, the amplifier 12 may be more than two operational amplifiers in series. For example, as shown in fig. 6, the amplifier 12 includes a first operational amplifier 19, a second operational amplifier 20, and a third operational amplifier 21. The gain factors of the first operational amplifier 19, the second operational amplifier 20 and the third operational amplifier 21 may be the same or different, and may be an amplifier with a fixed amplification factor or a digitally controlled amplifier with an adjustable amplification factor.

In some embodiments, as shown in fig. 7, the first signal controller 2 (or the second signal controller 7) further includes a switching circuit 22, the control circuit 10 is connected to the switching circuit 22, and the switching circuit 22 controls on and off of the gating switch 23 to control the amplification factor of the amplifier 12. The switching circuit 22 turns on the gate switch 23 corresponding to each operational amplifier according to the control of the control circuit 10 to turn off the first operational amplifier 19, the second operational amplifier 20, or the third operational amplifier 21, and turns off the gate switch 23 corresponding to each operational amplifier to use the amplification factor.

In other embodiments, the attenuator 11 and the amplifier 12 are provided in a hybrid arrangement, as shown in fig. 8, for example, the first signal controller 2 (or the second signal controller 7) includes a control circuit 10, a switching circuit 22, a first fixed attenuator 15, a second fixed attenuator 16, a first adjustable attenuator 17, a second adjustable attenuator 18, a first operational amplifier 19, a second operational amplifier 20, a third operational amplifier 21, and a corresponding plurality of gating switches 23. The control circuit 10 is in signal connection with the switching circuit 22 and the first and second adjustable attenuators 17 and 18. The switching circuit 22 can control the on and off of the gate switch 23 corresponding to the first operational amplifier 19, the second operational amplifier 20, or the third operational amplifier 21 so that the operational amplifier is not used and employed. The switching circuit 22 can control the on and off of the gate switches 23 corresponding to the first fixed attenuator 15 and the second fixed attenuator 16 so that the fixed attenuators are not used and employed. As shown in fig. 8, the first operational amplifier 19, the first fixed attenuator 15, the second operational amplifier 20, the first adjustable attenuator 17, the third operational amplifier 21, the second adjustable attenuator 18, and the second fixed attenuator 16 are sequentially connected, and the signal strength of the drain cable output radiation signal can be adjusted by adjusting the enabling or non-enabling of the operational amplifier, the enabling or non-enabling of the fixed attenuator, and the setting of the attenuation coefficient of the digitally controlled attenuator.

In order to accurately control the signal input intensity, a positioning base station is installed near the RRU equipment of the communication system and used for detecting the specific position of the terminal and feeding back the position information of the mobile terminal to the signal controller. The signal controller controls the signal intensity of the input leaky cable according to the position of the mobile terminal, so that the field intensity balance of two paths of signals is realized, and the MIMO effect of the real-time single-cable double-end feed-in signal is ensured. As shown in fig. 1, the first positioning base station 4 is in signal connection with the first signal controller 2, and the second positioning base station 5 is in signal connection with the second signal controller 7.

The positioning base station, for example, the first positioning base station 4 (or the second positioning base station 5) may provide location information of the mobile terminal, for example, location information of a mobile phone user, and obtain location information (geographic coordinates or geodetic coordinates) of the mobile terminal through a radio communication network (such as a GSM network, a CDMA network) of an operator or an external positioning mode (such as GPS).

When the first signal controller 2 receives the first signal of the first RRU 3, the first positioning base station 4 obtains the position information of the mobile terminal 14, and the first signal controller 2 obtains the position information of the mobile terminal 14 and calculates the length y of the leaky cable from the first end a of the leaky cable along the extension direction, where L is the length interval of the leaky cable and is a constant value.

When the leaky cable is uniformly distributed in a single slotted hole, if L-2y<0, then the mobile terminal 14 is closer to the leaky cable second end B, then in order to make the difference between the strengths of the two signals fed in from both ends a and B received by the mobile terminal 14 within the allowable range, the first signal should be increased by the first signal controller 2 before being input into the leaky cable first end a, or the second signal should be attenuated by the second signal controller 7 before being input into the leaky cable second end B, or at the same time the first signal should be increased by the first signal controller 2 before being input into the leaky cable first end a, and the second signal should be attenuated by the second signal controller 7 before being input into the leaky cable second end B. For example, in some embodiments, the first path signal should be increased by the first signal controller 2 before being input into the first end a of the leaky cable, and the control circuit of the first signal controller 2 controls the amplifier 12 to amplify β（２ｙ-L) times, β being the magnification constant. For example, in some embodiments, the second path signal is attenuated by the second signal controller 7 before being input into the second end B of the leaky cable, and the attenuator 11 is controlled by the control circuit of the second signal controller 7 to attenuate θ ∈ ->(2 y-L) dB, θ is the attenuation constant. For example, in some embodiments, while the first path of signal is amplified by the first signal controller 2 before being input into the first end A of the leaky cable and the second path of signal is attenuated by the second signal controller 7 before being input into the second end B of the leaky cable, the amplifier 12 is controlled to amplify β1 >(2 y-L) times, beta 1 is the amplification constant, and meanwhile, the control circuit of the second signal controller 7 controls the attenuator 11 to attenuate θ1 +.>(2 y-L) dB, θ1 is an attenuation constant, and may be β=θ=β1+θ1, for example. />

When the leaky cable is uniformly distributed in a single slotted hole, if L-2y>0, then the mobile terminal 14 is closer to the first end a of the leaky cable, then in order to make the difference between the strengths of the two signals fed in at the two ends a and B received by the mobile terminal 14 within an allowable range, the first signal should be attenuated by the first signal controller 2 before being input into the first end a of the leaky cable, or the second signal should be amplified by the second signal controller 7 before being input into the second end B of the leaky cable, or simultaneously the first signal should be attenuated by the first signal controller 2 before being input into the first end a of the leaky cable, and the second signal should be amplified by the second signal controller 7 before being input into the second end B of the leaky cable. For example, in some embodiments, the first path signal should be attenuated by the first signal controller 2 before being input into the first end a of the drain cable, and the attenuator 11 is controlled by the control circuit of the first signal controller 2 to attenuate θ（L-２y) dB, θ is the decay constant. For example, in some embodiments, the second signal is amplified by the second signal controller 7 before being input into the second end B of the leaky cable, and the control circuit of the second signal controller 7 controls the amplifier 12 to amplify β +. >(L-2 y) times, beta being the magnification constant. For example, in some embodiments, the attenuation is performed by the first signal controller 2 before the first path signal is input into the first end A of the leaky cable, and the amplification is performed by the second signal controller 7 before the second path signal is input into the second end B of the leaky cable, and the attenuator 11 is controlled by the control circuit of the first signal controller 2 to attenuate θ2->(L-2 y) dB, theta 2 is an attenuation constant, and simultaneously the control circuit of the second signal controller 7 controls the amplifier 12 to amplify beta 2 +.>(L-2 y) times, β2 is the magnification constant. For example θ=β=θ2+β2.

In some embodiments, for example, the first signal controller 2 (or the second signal controller 7) includes a control circuit 10, an attenuator 11 and an amplifier 12, and the attenuator 11 and the amplifier 12 can be cooperatively controlled by the control circuit 10 to obtain amplification or attenuation of the first signal (or the second signal), so as to precisely control the input signal strength of the input signals at two ends of the leaky cable, and further control the two signal strengths received by the mobile terminal in the processing range of the device.

According to the MIMO communication system and the control method adopting the feed-in signals at the two ends of the leaky cable, 2X 2 MIMO can be realized by feeding in different signals from the two ends of a single leaky cable, the space can be saved, the cost of the system can be reduced, and meanwhile, the user perception rate of a network can be improved; and rely on addding signal controller and location basic station and corresponding signal strength adjustment control, can solve the double-circuit signal and can exist the unevenness of signal, cause mobile terminal to receive the big difference, the problem that is difficult to handle, the system can be according to the change of the position real-time control input cable leakage signal strength of terminal and then control two-way signal strength that the terminal received at equipment processing range, guarantee communication quality.

Example 2

In other embodiments of the present application, the number of leaky cables may be more than two, and the radiation polarization directions of adjacent leaky cables may be different. For example, the number of the leaky cables is two, 4×4 MIMO is configured, and the radiation polarization directions of the two leaky cables are different. As shown in fig. 9, the leaky cable is provided with a first leaky cable 24 and a second leaky cable 25, the first leaky cable 24 is a vertically polarized leaky cable, the second leaky cable 25 is a horizontally polarized leaky cable, the two cables can form 4×4 MIMO, the radiation polarization directions of adjacent leaky cables are different, the two ends of the two cables respectively feed in 4 paths of signals to have four polarized spatial polarization directions, and compared with the adjacent homopolar leaky cable, the spatial polarization isolation is high, and MIMO is better. Preferably, the polarization direction is vertical polarization, horizontal polarization, +45° polarization, -45 ° polarization. The rest is described in embodiment 1, and will not be described in detail here.

For example, the number of leaky cables may be set to four, constituting 8×8 MIMO. As shown in fig. 10, the drain is provided with a first drain 24, a second drain 25, a third drain 26, and a fourth drain 27, the first drain 24 is a vertically polarized drain, the second drain 25 is a horizontally polarized drain, the third drain 26 is a vertically polarized drain, the fourth drain 27 is a horizontally polarized drain, and the four cables can form 8×8 MIMO, so that the system capacity can be further improved. Preferably, the polarization direction is vertical polarization, horizontal polarization, +45° polarization, -45 ° polarization. The rest is described in embodiment 1, and will not be described in detail here.

Generally, the performance of a plurality of leaky cables arranged side by side is less different. The first signal controller or the second signal controller can acquire the position information of the mobile terminal from a positioning base station connected with the first signal controller or the second signal controller through signals, calculate the lengths of the mobile terminal from the first end and the second end of any one leaky cable (which can be defined as a target leaky cable) along the extending direction of the target leaky cable according to the position information, and calculate the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the target leaky cable at the mobile terminal according to the lengths of the mobile terminal from the first end and the second end of the target leaky cable along the extending direction of the target leaky cable and the attenuation constant of the target leaky cable; in response to the signal strength difference being greater than a preset difference threshold, the first signal controller is configured to adjust a signal strength of a first signal fed into the first end of each drain cable, where an adjustment degree of the first signal fed into each drain cable may be the same; and/or the second signal controller is configured to adjust a signal strength of a second signal fed to the second end of each drain cable, where the adjustment degree of the second signal fed to each drain cable may be the same, so that the signal strength difference is less than or equal to the preset difference threshold. The adjusting mode is high in efficiency.

Of course, in other embodiments, the adjustment process of the corresponding single leaky cable as in fig. 1 may be performed separately for each leaky cable.

Example 3

Correspondingly, in the embodiment of the present application, there is further provided a MIMO communication control apparatus employing feeding signals from two ends of a leaky cable, where the first signal controller 2 shown in fig. 11 includes: comprises a distance acquisition module 30, a signal intensity difference calculation module 31 and a first signal intensity adjustment module 29. The distance acquisition module 30 may be in signal connection with an external positioning base station, and is configured to acquire position information of the mobile terminal, and calculate and acquire, according to the position information, a length of the mobile terminal, which is away from a first end of the leaky cable and is along the leaky cable extending direction, and a length of the mobile terminal, which is away from a second end of the leaky cable and is along the leaky cable extending direction. As shown in fig. 11, the distance acquisition module 30 in the first signal controller 2 is signal-connected to the first positioning base station 4. The structure of the second signal controller 7 is the same as that of the first signal controller 2, for example, the distance acquisition module 30 in the second signal controller 7 is in signal connection with the second positioning base station 5. A signal strength difference calculating module 31, configured to calculate a signal strength difference of the radiation signals of the signals input by the first end a and the second end B of the leaky cable at the mobile terminal 14 according to the lengths of the mobile terminal 14 from the first end a and the second end B of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable (the calculation process is described in embodiment 1, and will not be described in detail here). The first signal strength adjustment module 29 is configured to amplify the signal strength of the first signal fed into the first end of the leaky cable according to the signal strength difference being greater than a preset difference threshold, and the length of the mobile terminal along the leaky cable extending direction being greater than the length of the mobile terminal along the leaky cable extending direction from the second end of the leaky cable; or the method is used for carrying out signal intensity attenuation on the first signal fed into the first end of the leaky cable according to the condition that the signal intensity difference is larger than a preset difference threshold value, and the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable is smaller than the length of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable, so that the difference value of the signal intensities of the first end and the second end of the leaky cable received by the mobile terminal 14 is smaller than or equal to the preset difference threshold value.

In some embodiments, a MIMO communication control apparatus employing signals fed from both ends of a leaky cable, the second signal controller 7 shown in fig. 12 includes: the distance acquisition module 30, the signal strength difference calculation module 31, and the second signal strength adjustment module 32. The distance acquisition module 30 may be in signal connection with an external positioning base station, and is configured to acquire position information of the mobile terminal, and calculate and acquire, according to the position information, a length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable, and a length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable. As shown in fig. 11, the distance acquisition module 30 in the second signal controller 7 is signal-connected to the second positioning base station 5. A signal strength difference calculating module 31, configured to calculate a signal strength difference of the radiation signals of the signals input by the first end a and the second end B of the leaky cable at the mobile terminal 14 according to the lengths of the mobile terminal 14 from the first end a and the second end B of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable (the calculation process is described in embodiment 1, and will not be described in detail here). The second signal strength adjustment module 32 is configured to attenuate, according to the signal strength difference being greater than a preset difference threshold, a length of the mobile terminal along the extension direction of the leaky cable from the first end of the leaky cable being greater than a length of the mobile terminal along the extension direction of the leaky cable from the second end of the leaky cable, a signal strength of a second signal fed into the second end of the leaky cable; or the signal intensity difference is used for amplifying the signal intensity of the second signal fed into the second end of the leaky cable according to the signal intensity difference being larger than a preset difference threshold value, and the length of the mobile terminal, along the extension direction of the leaky cable, from the first end of the leaky cable is smaller than the length of the mobile terminal, along the extension direction of the leaky cable, from the second end of the leaky cable, so that the difference value of the signal intensity of the first end and the signal intensity of the second end of the leaky cable received by the mobile terminal 14 is smaller than or equal to the preset difference threshold value.

The rest is described in embodiment 1, and will not be described in detail here.

According to the MIMO communication control device adopting the feed-in signals at the two ends of the leaky cable, when RRUs at the two ends of the leaky cable are combined into the same cell, the signal intensity of the signals fed into the two ends of the leaky cable can be adjusted in real time according to the lengths of the mobile terminal, which are away from the first end of the leaky cable and the second end of the leaky cable and are in the extending direction of the leaky cable by means of the distance acquisition module, the signal intensity difference calculation module and the signal intensity adjustment module, so that the signal intensity difference received by the mobile terminal is smaller than a preset difference threshold value, the processing requirement of the mobile terminal is met, and the communication quality is ensured.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are within the spirit and principles of the embodiments of the application, are intended to be included within the scope of the application.

Claims

1. The MIMO communication system for feeding signals to two ends of a leaky cable is characterized by comprising a first POI, a first signal controller, a first RRU, a first positioning base station, a second POI, a second signal controller, a second RRU, a second positioning base station and at least one leaky cable; the first end signal of the leaky cable is connected with a first POI, the first POI signal is connected with a first signal controller, the first signal controller is connected with a first RRU and a first positioning base station, the second end signal of the leaky cable is connected with a second POI, the second POI signal is connected with a second signal controller, and the second signal controller is connected with a second RRU and a second positioning base station; the PCI (physical cell identifier) of the first RRU and the PCI of the second RRU are set to be the same; the leakage cables are uniformly distributed in single slotted holes;

The first signal controller or the second signal controller is used for acquiring the position information of the mobile terminal from a positioning base station connected with the first signal controller or the second signal controller through signals, calculating the lengths of the mobile terminal, which are away from the first end and the second end of the target leaky cable, along the extending direction of the target leaky cable according to the position information, and calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the target leaky cable at the mobile terminal according to the lengths of the mobile terminal, which are away from the first end and the second end of the target leaky cable, along the extending direction of the target leaky cable and the attenuation constant of the target leaky cable; wherein the target leaky cable belongs to the at least one leaky cable; the signal strength difference is the product of the difference of the lengths of the mobile terminal, which are away from the first end and the second end of the leaky cable and are along the extension direction of the leaky cable, and the attenuation constant of the leaky cable;

the first signal controller is used for responding to the signal intensity difference to be larger than a preset difference threshold value, adjusting the signal intensity of a first signal fed into the first end of the at least one leaky cable, and/or the second signal controller is used for responding to the signal intensity difference to be larger than the preset difference threshold value, and adjusting the signal intensity of a second signal fed into the second end of the at least one leaky cable, so that the signal intensity difference is smaller than or equal to the preset difference threshold value.

2. The MIMO communication system as recited in claim 1 wherein the first signal controller and the second signal controller each comprise an attenuator, an amplifier, and a control circuit; the control circuit is in signal connection with the attenuator or the amplifier, and the attenuator and the amplifier are connected in series.

3. The MIMO communication system of claim 2, wherein the first signal controller and the second signal controller each further comprise a switching circuit, the control circuit is in signal connection with the switching circuit, and the switching circuit is in signal connection with a gating switch corresponding to the attenuator and/or a gating switch corresponding to the amplifier.

4. A MIMO communication system as claimed in claim 1, wherein at least two of said leaky cables are arranged such that the directions of radiation polarization between adjacent ones of said leaky cables are different.

5. The MIMO communication system as recited in claim 4, wherein the radiation polarization direction of the leaky cable is vertical polarization, horizontal polarization, +45° polarization or-45 ° polarization.

6. The MIMO communication control method for feeding signals to two ends of a leaky cable, wherein the leaky cable is uniformly distributed in a single slot hole, and the method is characterized by comprising the following steps:

setting PCI (physical cell identification) of RRUs (remote radio units) at two ends of a leaky cable to be the same;

acquiring position information of a mobile terminal, and calculating lengths of the mobile terminal, which are away from a first end and a second end of a leaky cable, along the extension direction of the leaky cable according to the position information;

calculating the signal intensity difference of the radiation signals of the input signals of the first end and the second end of the leaky cable at the mobile terminal according to the lengths of the first end and the second end of the leaky cable along the extension direction of the leaky cable and the attenuation constant of the leaky cable; the signal strength difference is the product of the difference of the lengths of the mobile terminal, which are away from the first end and the second end of the leaky cable and are along the extension direction of the leaky cable, and the attenuation constant of the leaky cable;

and adjusting the signal intensity of the first signal fed into the first end of the leaky cable and/or the signal intensity of the second signal fed into the second end of the leaky cable according to the fact that the signal intensity difference is larger than a preset difference threshold value, so that the signal intensity difference between the first signal and the second signal received by the mobile terminal is not larger than the preset difference threshold value.

7. The MIMO communication control method of a leaky cable both-end feed signal as claimed in claim 6, further comprising the steps of:

according to the fact that the signal intensity difference is larger than a preset difference threshold value, and the length of the mobile terminal, along the extension direction of the leaky cable, from the first end of the leaky cable is larger than the length of the mobile terminal, along the extension direction of the leaky cable, from the second end of the leaky cable, the first signal fed into the first end of the leaky cable is amplified in signal intensity, or the second signal fed into the second end of the leaky cable is attenuated in signal intensity;

according to the signal intensity difference being larger than the preset difference threshold, and the length of the mobile terminal along the extension direction of the leaky cable from the first end of the leaky cable being smaller than the length of the mobile terminal along the extension direction of the leaky cable from the second end of the leaky cable, and carrying out signal intensity attenuation on the first signal fed into the first end of the leakage cable or carrying out signal intensity amplification on the second signal fed into the second end of the leakage cable.

8. The MIMO communication control method for feeding signals to both ends of a leaky cable according to claim 6, wherein calculating the lengths of the mobile terminal from the first end and the second end of the leaky cable along the extension direction of the leaky cable further comprises the steps of: acquiring position information of a mobile terminal, position information of a first end of a leaky cable and position information of a second end of the leaky cable; calculating the length of the mobile terminal, which is away from the first end of the leaky cable and is along the extension direction of the leaky cable, according to the position information of the mobile terminal and the position information of the first end of the leaky cable; calculating the length of the mobile terminal, which is away from the second end of the leaky cable and is along the extension direction of the leaky cable, according to the position information of the mobile terminal and the position information of the second end of the leaky cable;

Or comprises the steps of: acquiring position information of a mobile terminal and position information of a first end of a leaky cable, calculating the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable according to the position information of the mobile terminal and the position information of the first end of the leaky cable, and calculating the length of the mobile terminal, which is away from the second end of the leaky cable, along the extension direction of the leaky cable according to the length of the mobile terminal, which is away from the first end of the leaky cable, along the extension direction of the leaky cable;

or comprises the steps of: acquiring position information of a mobile terminal and position information of a leaky cable second end, calculating the length of the mobile terminal, which is away from the leaky cable second end and is along the leaky cable extending direction, according to the position information of the mobile terminal and the position information of the leaky cable second end, and calculating the length of the mobile terminal, which is away from the leaky cable first end and is along the leaky cable extending direction, according to the length of the mobile terminal, which is away from the leaky cable second end and is along the leaky cable extending direction.

9. The MIMO communication control method of feeding signals to both ends of a leaky cable according to claim 6, wherein a multiple or attenuation factor of signal intensity amplification of the first signal or the second signal is related to a difference in length of the mobile terminal from the first end and the second end of the leaky cable in the extension direction of the leaky cable.

10. The method for MIMO communication control of a leaky cable both-end feed signal as claimed in claim 6, wherein said preset difference threshold is 20dB at maximum.