CN109861771B - Adjacent channel interference power device and testing method for rail transit LTE wireless communication system - Google Patents
Adjacent channel interference power device and testing method for rail transit LTE wireless communication system Download PDFInfo
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Abstract
The invention discloses a device and a method for testing adjacent channel interference power of a rail transit LTE wireless communication system, wherein the device comprises a power supply module, a regulating module and a radio frequency module; the power supply module supplies power to the adjusting module and the radio frequency module, and the adjusting module is set as an adjusting parameter of the radio frequency module; the radio frequency module is configured to generate a signal and to condition the signal. The adjacent channel interference power device and the test method of the rail transit LTE wireless communication system can be placed near a train antenna to generate an interference signal which is the same as that of an adjacent channel base station, detect the adjacent channel interference power ratio of LTE under interference, and can also be connected to a vehicle-mounted antenna port, so that real adjacent channel radio interference can be simulated, and the adjacent channel interference power ratio of LTE under interference can be detected.
Description
Technical Field
The invention relates to the field of electronics and communication, in particular to an adjacent channel interference power device and a test method for a rail transit LTE wireless communication system.
Background
According to the requirements of related departments of the country, a TD-LTE wireless communication system of 1785 and 1805MHz is adopted for a newly built rail transit line to transmit data of a train control system (CBTC) based on communication between vehicles and the ground. Since adjacent frequencies on both sides of the frequency band are allocated to other communication systems to work, it is very important to test the adjacent channel interference power ratio of the LTE wireless communication system under specific adjacent frequency interference in order to ensure reliable transmission of CBTC data.
The existing test of the adjacent channel interference power ratio of the LTE wireless communication system under specific adjacent channel interference generally has two modes: field testing and laboratory testing.
The existing field test method comprises the following steps: and starting the adjacent frequency communication equipment to enable the adjacent frequency communication equipment to work at the maximum power, starting a train LTE system, moving a train body at a low speed near interference, searching a maximum interference place, and then testing the interference power ratio of the LTE adjacent channel. The existing laboratory test methods are: connecting a special signal source with a train LTE terminal through a channel instrument, calculating a channel attenuation value by using a radio transmission theory through field environment parameters, setting the channel instrument by using the attenuation value, opening the special signal source and the vehicle-mounted LTE terminal, and then testing the adjacent channel interference power ratio of the LTE system.
On one hand, the existing field test starts the adjacent channel communication equipment to enable the adjacent channel communication equipment to work at the maximum power, and on the other hand, the train LTE system is started, the train body is moved at a low speed near the interference, the maximum interference place is searched, and the LTE adjacent channel interference power ratio is tested. The main disadvantage is the large amount of engineering and the difficulty in reproducing the worst interference situations.
The existing laboratory test methods are: connecting a special signal source with a train LTE terminal through a channel instrument, calculating a channel attenuation value by using a radio transmission theory through field environment parameters, setting the channel instrument by using the attenuation value, opening the special signal source and the vehicle-mounted LTE terminal, and then testing the adjacent channel interference power ratio of the LTE system. The method adopts a general instrument, requires technical personnel with electromagnetic fields and communication to specially calculate channels, designs the whole test flow, and has the main defects of strict condition requirements, complex operation and large workload.
Disclosure of Invention
In view of the above defects in the prior art, the technical problems to be solved by the present invention are to solve the problems of the existing field test method that a train needs to be moved to a specially-designed place and the engineering quantity is large and the problems of the existing laboratory test method that the whole test process is complex to operate and the engineering quantity is large by designing a technologist with an electromagnetic field and communication specially, and to provide an adjacent channel interference power device and a test method for a rail transit LTE wireless communication system, which can be placed near a train antenna to generate an interference signal the same as that of an adjacent frequency base station, detect the adjacent channel interference power ratio of LTE under interference, and can also be connected to a vehicle-mounted antenna port to simulate real adjacent frequency radio interference and detect the adjacent channel interference power ratio of LTE under interference.
In order to achieve the purpose, the invention provides an adjacent channel interference power device of a rail transit LTE wireless communication system, which comprises a power module, a regulating module and a radio frequency module; the power supply module supplies power to the adjusting module and the radio frequency module, and the adjusting module is set as an adjusting parameter of the radio frequency module; the radio frequency module is configured to generate a signal and to condition the signal.
Further, the radio frequency module comprises a control unit, a radio frequency unit, a power adjusting unit and an antenna unit; the control unit receives the information of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit; the antenna unit is connected with the power adjusting unit.
Further, the antenna unit comprises an antenna interface and an antenna, and the antenna is configured to be connected with the power adjusting unit through the antenna interface.
Further, the control unit comprises a controller, the radio frequency unit comprises a radio frequency generator, and the power adjusting unit comprises a power adjuster.
Further, the adjustment module includes an adjustment panel configured to adjust a plurality of parameters.
Further, the parameters include environment type, interference source type, horizontal distance, vertical height, incoming wave direction, and the like.
Further, the power module is configured to provide a dc power.
Another preferred embodiment of the present invention provides a method for testing an adjacent channel interference power device in a rail transit LTE wireless communication system, including the following steps:
mounting the device at a designated location;
acquiring various parameter data according to the installation position;
adjusting parameters of the adjusting module according to the obtained parameter data;
and the radio frequency module transmits and adjusts the signal according to the parameter of the adjusting module.
Further, the radio frequency module transmits and adjusts the signal according to the parameter of the adjusting module, which specifically comprises the following steps:
the control unit receives the parameters of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit;
the radio frequency unit receives a control signal sent by the control unit and generates an LTE adjacent frequency broadband signal;
the power adjusting unit receives the control signal sent by the control unit and adjusts the LTE adjacent frequency broadband signal generated by the radio frequency unit.
Further, adjusting parameters of the adjusting module according to the obtained parameter data specifically includes:
and adjusting parameters such as environment type, interference source type, horizontal distance, vertical height, incoming wave direction and the like according to the obtained parameter data.
Technical effects
The adjacent channel interference power device of the rail transit LTE wireless communication system has the functions of an interference source and an intelligent channel instrument and is used for testing the adjacent channel interference power ratio of the rail transit LTE system. The device is placed at a specific distance point near a train antenna, generates an interference signal which is the same as that of an adjacent frequency base station, and is used for detecting the adjacent channel interference power ratio of an LTE system under interference on site.
According to the adjacent channel interference power device and the test method for the rail transit LTE wireless communication system, a train does not need to be started, the device is placed near a vehicle-mounted terminal, and the parameters on the panel of the device are adjusted to generate corresponding adjacent frequency signals to implement interference on LTE, so that the operation is greatly simplified, and the expenditure is saved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram of an adjacent channel interference power apparatus of a rail transit LTE wireless communication system according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a method for testing adjacent channel interference power device in a rail transit LTE wireless communication system according to a preferred embodiment of the present invention.
Detailed Description
As shown in fig. 1, an embodiment of the present invention provides an adjacent channel interference power apparatus for a rail transit LTE wireless communication system, including a power module, a regulation module, and a radio frequency module; the power supply module supplies power to the adjusting module and the radio frequency module, and the adjusting module is set as an adjusting parameter of the radio frequency module; the radio frequency module is configured to generate a signal and to condition the signal.
The radio frequency module comprises a control unit, a radio frequency unit, a power adjusting unit and an antenna unit; the control unit receives the information of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit; the antenna unit is connected with the power adjusting unit. The antenna unit comprises an antenna interface and an antenna, and the antenna is connected with the power adjusting unit through the antenna interface. The control unit comprises a controller, the radio frequency unit comprises a radio frequency generator, and the power adjusting unit comprises a power adjuster. The adjustment module includes an adjustment panel configured to adjust a plurality of parameters. The parameters include environment type, interference source type, horizontal distance, vertical height, incoming wave direction, etc. The power module is configured to provide a DC power.
The adjacent channel interference power device of the rail transit LTE wireless communication system will be described as a specific example.
The invention discloses an adjacent channel interference power device of a rail transit LTE wireless communication system. The controller receives the information of the adjusting panel and sends control information to the radio frequency generator and the power regulator through the look-up table and calculation. The radio frequency generator is controlled by the controller and generates an LTE adjacent frequency broadband signal. The power regulator is controlled by the controller and regulates the power of the LTE adjacent frequency broadband signal. The antenna interface is used for connecting the power regulator and the antenna. The matched antenna is configured according to different adjacent frequency frequencies and different radiation angles. And adjusting knobs such as environment types, frequency, bandwidth, horizontal distance, vertical height, incoming wave direction, power and the like are arranged on the adjusting panel. The power module is used for generating direct current power required by the device. The environment type is marked as a tunnel and the ground, the interference source type is marked as an adjacent frequency interference system name, the horizontal distance is the horizontal distance between the on-site train vehicle-mounted terminal and the interference source, the vertical height is the vertical height between the on-site train vehicle-mounted terminal and the interference source, and the incoming wave direction is the included angle between the interference source antenna and the main direction of the vehicle-mounted terminal antenna at the moment of maximum interference.
The controller converts interference source data transmitted by the panel into parameters such as frequency, bandwidth, modulation mode and the like according to the standard of the communication system so as to control the radio frequency generator to generate a standard interference signal. The controller converts the environment type, horizontal distance, vertical height, incoming wave direction and other data transmitted by the panel into channel parameters to control the power regulator according to the rule of electromagnetic wave transmission in space. The power regulator generates an LTE adjacent frequency broadband signal, and transmits a radio signal through the antenna interface and the matched antenna.
The adjacent channel interference power device of the rail transit LTE wireless communication system is not only suitable for field test but also suitable for laboratory test.
The adjacent channel interference power device of the rail transit LTE wireless communication system has the functions of an interference source and an intelligent channel instrument and is used for testing the adjacent channel interference power ratio of the rail transit LTE system. The device is placed at a specific distance point near a train antenna, generates an interference signal which is the same as that of an adjacent frequency base station, and is used for detecting the adjacent channel interference power ratio of an LTE system under interference on site.
Another preferred embodiment of the present invention provides a method for testing an adjacent channel interference power device in a rail transit LTE wireless communication system, including the following steps:
mounting the device at a designated location;
acquiring various parameter data according to the installation position;
adjusting parameters of the adjusting module according to the obtained parameter data;
and the radio frequency module transmits and adjusts the signal according to the parameter of the adjusting module.
The radio frequency module transmits and adjusts signals according to parameters of the adjusting module, and the method specifically comprises the following steps:
the control unit receives the parameters of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit;
the radio frequency unit receives a control signal sent by the control unit and generates an LTE adjacent frequency broadband signal;
the power adjusting unit receives the control signal sent by the control unit and adjusts the LTE adjacent frequency broadband signal generated by the radio frequency unit.
In addition, according to the obtained parameter data, the parameters of the adjusting module are adjusted, and the method specifically comprises the following steps:
and adjusting parameters such as environment type, interference source type, horizontal distance, vertical height, incoming wave direction and the like according to the obtained parameter data.
The following two examples are used to respectively illustrate the adjacent channel interference power device and the testing method of the rail transit LTE wireless communication system according to the present invention.
Example one
And (3) field test scheme:
aiming at the adjacent channel interference of a GSM1800M system erected beside a ground track traffic route, if the system belongs to China Mobile 2G, the frequency is set as follows: uplink/downlink: 1710-. The influence of the interference of the base station of the GSM1800M system on the traffic information flow of the rail transit LTE communication system can be detected by the following operations:
1. setting a first grade on the adjusting panel according to the environment type: the "ground".
2. Setting a first grade on the adjusting panel according to the type of the interference source: "China Mobile GSM 1800M".
8. And receiving the frequency information of the interference source of the adjusting panel at the controller, and sending control information to the radio frequency generator and the power adjuster. The radio frequency generator is controlled by the controller to generate 1805 and 1815MHz broadband signals.
9. The base station is measured to be 50m from the center of the track, and the horizontal distance on the adjusting panel is set to be 50.
10. The height of the base station vertical to the track surface is measured to be 20m, and the vertical height on the adjusting panel is set to be 20.
11. The height of the base station vertical to the track surface is measured to be 20m, and the vertical height on the adjusting panel is set to be 20.
12. In order to test the maximum interference, the incoming wave direction of the base station is a vertical track, and the incoming wave direction of the base station on the adjusting panel is 0.
13. Assuming that the nominal power transmitted by the china mobile GSM1800M base station is 46dBm, the power on the adjustment panel is set to 46.
14. The other knobs of the adjustment panel are set to default values.
15. The controller solidifies the basic algorithm of channel attenuation according to the rule of electromagnetic wave transmission in space and the formula of electromagnetic field propagation loss in space in advance, and converts the data of power, horizontal distance, vertical height, incoming wave direction and the like transmitted by the panel into channel parameters to control the power regulator. The interference signal sent by the device is the same as the downlink signal of the actual China Mobile GSM1800M base station.
16. The device is placed at a standard distance of 5m near the train antenna, an omnidirectional antenna is installed, the device is started, and the same interference signal as the adjacent frequency base station is sent.
17. And starting the vehicle-mounted LTE terminal according to the original operation steps of the train LTE-M, and loading the CBTC transmission service.
18. According to the network monitoring method when the original LTE-M carries the service, the adjacent channel interference power ratio of the LTE system under the interference is detected.
Example two
Laboratory test protocol:
aiming at the adjacent channel interference of a GSM1800M system erected beside a ground track traffic route, if the system belongs to China Mobile 2G, the frequency is set as follows: uplink/downlink: 1710-.
The method can detect the influence on the service information flow when the system base station interferes with the rail transit LTE communication by the following operations:
1. 15, same as embodiment one.
16. The device is placed in a laboratory, and the device is connected with the vehicle-mounted LTE terminal and started by a radio frequency short circuit and a fixed attenuator.
17. And starting the vehicle-mounted LTE terminal according to the original operation steps of the train LTE-M, and loading the CBTC transmission service.
18. According to the network monitoring method when the original LTE-M carries the service, the adjacent channel interference power ratio of the LTE system under the interference is detected.
The adjacent channel interference power device of the rail transit LTE wireless communication system disclosed by the invention has the functions of an interference source and an intelligent channel instrument and is used for testing the adjacent channel interference power ratio of the rail transit LTE system. When the device is placed in a laboratory for use, an antenna port of the device is connected to an LTE vehicle-mounted antenna port, an interference signal which is the same as that of an adjacent frequency base station is generated, and the interference signal is used for detecting the adjacent channel interference power ratio of an LTE system in the laboratory under interference. The controller converts the interference source data transmitted by the panel into parameters such as frequency, bandwidth, modulation mode and the like according to the standard of the communication system so as to control the radio frequency generator to generate a standard interference signal. The controller converts the environment type, horizontal distance, vertical height, incoming wave direction and other data transmitted by the panel into channel parameters to control the power regulator according to the rule of electromagnetic wave transmission in space.
According to the adjacent channel interference power device and the test method for the rail transit LTE wireless communication system, a train does not need to be started, the device is placed near a vehicle-mounted terminal, and the corresponding adjacent frequency signal can be generated by adjusting parameters on a panel of the device to interfere with LTE, so that the operation is greatly simplified, the expenditure is saved, and the cost is reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. The adjacent channel interference power device of the rail transit LTE wireless communication system is characterized by comprising a power supply module, a regulating module and a radio frequency module; the power supply module supplies power to the adjusting module and the radio frequency module, and the adjusting module is set as an adjusting parameter of the radio frequency module; the radio frequency module is configured to generate and adjust a signal; the parameters comprise environment type, interference source type, horizontal distance, vertical height, incoming wave direction and the like; the system comprises an environment type, an interference source type, a field train vehicle-mounted terminal, an interference source antenna, a signal processing unit and a signal processing unit, wherein the environment type is marked as a tunnel and a ground, the interference source type is marked as an adjacent frequency interference system name, the horizontal distance is the horizontal distance between the field train vehicle-mounted terminal and the interference source, the vertical height is the vertical height between the field train vehicle-mounted terminal and the interference source, and the incoming wave direction is the included angle between the interference source antenna and the main direction of the vehicle-mounted terminal antenna at the moment of maximum interference;
the radio frequency module comprises a control unit, a radio frequency unit, a power adjusting unit and an antenna unit; the control unit receives the information of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit; the antenna unit is connected with the power adjusting unit; the antenna unit comprises an antenna interface and an antenna, and the antenna is connected with the power regulating unit through the antenna interface; the control unit comprises a controller, the radio frequency unit comprises a radio frequency generator, and the power adjusting unit comprises a power adjuster;
the controller receives the information of the adjusting panel and sends control information to the radio frequency generator and the power regulator through look-up table and calculation; the radio frequency generator is controlled by the controller and generates an LTE adjacent frequency broadband signal; the power regulator is controlled by the controller and regulates the power of the LTE adjacent frequency broadband signal; the antenna interface is used for connecting the power regulator and the antenna; the matched antenna is configured according to different adjacent frequency frequencies and different radiation angles.
2. The rail transit LTE wireless communication system adjacent channel interference power arrangement of claim 1, wherein the adjustment module includes an adjustment panel configured to adjust a plurality of parameters.
3. The adjacent channel interference power device of the rail transit LTE wireless communication system of claim 1, wherein the power module is configured to provide a dc power.
4. The method for testing the adjacent channel interference power device of the rail transit LTE wireless communication system according to any of the above claims 1-3, characterized by comprising the following steps:
mounting the device at a designated location;
acquiring various parameter data according to the installation position; the parameters comprise environment type, interference source type, horizontal distance, vertical height, incoming wave direction and the like; the system comprises an environment type, an interference source type, a field train vehicle-mounted terminal, an interference source antenna, a signal processing unit and a signal processing unit, wherein the environment type is marked as a tunnel and a ground, the interference source type is marked as an adjacent frequency interference system name, the horizontal distance is the horizontal distance between the field train vehicle-mounted terminal and the interference source, the vertical height is the vertical height between the field train vehicle-mounted terminal and the interference source, and the incoming wave direction is the included angle between the interference source antenna and the main direction of the vehicle-mounted terminal antenna at the moment of maximum interference;
adjusting parameters of the adjusting module according to the obtained parameter data;
and the radio frequency module transmits and adjusts signals according to the parameters of the adjusting module.
5. The method for testing the adjacent channel interference power device of the rail transit LTE wireless communication system as claimed in claim 4, wherein the radio frequency module transmits and adjusts a signal according to a parameter of the adjusting module, specifically comprising the steps of:
the control unit receives the parameters of the adjusting module and sends control information to the radio frequency unit and the power adjusting unit;
the radio frequency unit receives the control signal sent by the control unit and generates an LTE adjacent frequency broadband signal;
and the power adjusting unit receives the control signal sent by the control unit and adjusts the LTE adjacent frequency broadband signal generated by the radio frequency unit.
6. The method for testing the adjacent channel interference power device of the rail transit LTE wireless communication system according to claim 4, wherein adjusting the parameter of the adjusting module according to the obtained parameter data specifically includes:
and adjusting parameters such as environment type, interference source type, horizontal distance, vertical height, incoming wave direction and the like according to the obtained parameter data.
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| CN113141217B (en) * | 2021-03-10 | 2022-11-08 | 上海大学 | Quick system of patrolling and examining of track traffic multifrequency wireless signal |
| CN113038516A (en) * | 2021-03-26 | 2021-06-25 | 苏州攀登者信息科技有限公司 | Downlink frequency band estimation method applied to high-speed rail system |
| CN114157373A (en) * | 2021-12-06 | 2022-03-08 | 上海中铁通信信号测试有限公司 | Rail transit wireless communication interference test method and device |
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Denomination of invention: Adjacent channel interference power device and testing method for LTE wireless communication system in rail transit Effective date of registration: 20230522 Granted publication date: 20220114 Pledgee: Industrial Bank Co.,Ltd. Shanghai Jing'an Sub branch Pledgor: SHANGHAI CONTRON INFORMATION TECHNOLOGY CO.,LTD. Registration number: Y2023310000204 |
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