CN113541831A - Channel self-adapting method - Google Patents
Channel self-adapting method Download PDFInfo
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- CN113541831A CN113541831A CN202110652000.XA CN202110652000A CN113541831A CN 113541831 A CN113541831 A CN 113541831A CN 202110652000 A CN202110652000 A CN 202110652000A CN 113541831 A CN113541831 A CN 113541831A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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Abstract
The invention provides a channel self-adaptive method, which is used for a wireless slip ring system and comprises the following steps: the first port sends a test signal with a bandwidth to the second port; the second port receives the test signal and carries out channel quality evaluation; the second port feeds back the information of the evaluated optimal frequency band or optimal frequency point to the first port; if the first port receives the feedback information of the second port, the first port adjusts the frequency band of the effective signal according to the feedback information of the second port, and sends the effective signal for communication. Through the channel self-adaption method, the wireless slip ring system can select the optimal frequency band or the optimal frequency point to carry out signal transmission, so that the reliability of signal transmission is optimized.
Description
Technical Field
The invention relates to the technical field of data communication and transmission, in particular to a channel self-adaption method in a multi-channel slip ring application environment.
Background
Rotational communication is a way of transmitting signals between two structures that rotate relative to each other. With the advancement of science and technology, a great number of rotating structures are required to be used in key equipment such as modern military industry, electronics, aviation, electric power, metallurgy, petrochemical industry, communication, network monitoring and intelligent manufacturing, and the transmission of signals and energy in the rotating structures is a difficult point and a hot point of research in the industry.
In current applications, conductive slip rings are primarily used to effect signal transmission between two relatively rotating structures. In a conventional contact type conductive slip ring, a stator and a rotor are connected through a brush and an electrical ring, respectively, and transmit power and signals as the rotor rotates. However, the contact type conductive slip ring has the following defects: because the electric brush and the electric ring are always in a friction state when the electric brush and the electric ring rotate relatively in the two rotating mechanisms, the electric brush and the electric ring are communicated in a physical contact mode. After using for a period of time, because the brush and the electrical ring wear out because of the continuous friction of having appeared, can lead to the physics deformation, lead to the life of brush and electrical ring to shorten greatly, brush and electrical ring contact often not contact often, form very unstable transmission channel, reliability and stability can reduce a lot, even totally fail. The shortened life of the electric brush and the electric ring also influences the service life of the whole product and increases the cost of the whole product.
In order to better solve the problem of short service life of the conventional contact conductive slip ring, some solutions propose to adopt a wireless slip ring technology to realize transmission connection. When the wireless slip ring is used for transmission connection, the cost of the device or the performance of hardware is limited, the highest working frequency of the system is limited, the transmission bandwidth is also limited, in some applications, a single channel cannot bear the required transmission rate, and at this time, multiple channels are required to be combined for transmission. However, when the multi-channel wireless slip ring carries out transmission, the transmission reliability is low, and the main reasons for the problem are as follows: (1) with regard to environmental interference, spatial radiation exists in any signal transmission, which can be called as "interference signal", and affects the transmission reliability of the signal of the wireless slip ring system; (2) regarding transmission signal interference, when multiple channels are simultaneously transmitted, some of the signals in the loop may be interfered, for example, near-field radiation interference or co-channel interference, which affects the transmission reliability of the signals in the loop.
Therefore, there is a need for a channel adaptive method, which can implement screening and optimization of channel environment, solve the problem of low reliability in the signal transmission process, and improve the reliability of signal transmission.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a channel adaptive method, which obtains an optimal transmission frequency point or an optimal transmission frequency band suitable for a channel by transmitting a channel test signal, thereby implementing channel transmission frequency adaptation. The channel self-adapting method provided by the invention can effectively improve the reliability of signal transmission.
In order to achieve the above object, the present invention provides a channel adaptation method, comprising: step 101, checking whether a device, a system connection and power supply are ready; 102, a first port sends a communication request instruction to a second port; 103, the first port judges whether a reply of the second port is received; if the first port does not receive the reply of the second port, returning to the step 101; step 104, if the first port receives the reply of the second port, the first port sends a test signal with bandwidth to the second port; 105, the second port receives the test signal and carries out channel quality evaluation; 106, the second port feeds back the information of the evaluated optimal frequency band or optimal frequency point to the first port; step 107, judging whether the first port receives the feedback information of the second port; if the first port does not receive the feedback information of the second port, returning to the step 101; step 108, if the first port receives the feedback information of the second port, the first port adjusts the frequency band of the effective signal according to the feedback information of the second port, and sends the effective signal for communication; step 109, the second port receives the valid signal in the first port, and processes the received signal.
The channel self-adaptive method provided by the invention has the following advantages: (1) when the channel self-adaptive optimization communication in the loop is carried out, only one loop is in communication in each optimization process, the set communication frequency band and communication frequency point are guaranteed to be the best communication frequency band and the best communication frequency point, and the reliability in the channel transmission process is further improved. By the channel self-adaption method, the problem that each loop in a multi-loop slip ring possibly interferes with each other during transmission can be effectively solved. (2) When the loop communication frequency band and the communication frequency point are set, the interference of other uncertain factors in the device where the slip ring is located is considered, and the influence of the environment of the device where the slip ring is located on signal transmission in the transmission process is avoided.
Preferably, in step 104, the bandwidth of the test signal is the range of the transmission frequency band of the system signal.
Preferably, in step 104, the accuracy of the test signal is determined according to the system communication quality requirement.
Preferably, in step 104, the frequency point of the test signal is a plurality of different frequency points uniformly selected on the bandwidth.
Preferably, in step 105, the index for evaluating the channel quality includes at least one of the following indexes: signal-to-noise ratio, time delay, bit error rate, retransmission rate, air interface rate, signal strength, data throughput, bit error rate, and symbol error rate.
Preferably, when the channel quality assessment indicator is a signal-to-noise ratio, the channel quality assessment comprises the following steps: and after the second port receives the test signal, calculating the signal-to-noise ratio of each frequency point under the channel.
Preferably, the frequency band with the highest signal-to-noise ratio is the best frequency band, and the frequency point with the highest signal-to-noise ratio is the best frequency point.
The invention also provides a wireless slip ring system adopting the channel self-adaption method, which is characterized by comprising a first port, a wireless slip ring device and a second port, wherein the first port is a signal processing module at a rotor end of the wireless slip ring device, and the second port is a signal processing module at a stator end of the wireless slip ring device; the wireless slip ring device at least comprises a rotor, a conductive slip ring and a conductive brush, wherein a non-contact radio wave transmission structure is arranged between the conductive brush and a conductive loop; the rotor is connected with the first port through a rotor lead, and the brush wires of the conductive brush are connected with the second port through a stator lead.
Preferably, the first port and the second port have at least one of the following functions: the device comprises a signal receiving function, a signal modulating function, a signal demodulating function, a signal transmitting function and an arithmetic processing function.
Preferably, the communication mode between the first port and the second port includes one of the following communication modes: simplex communication, half-duplex communication, and full-duplex communication.
Drawings
Fig. 1 is a schematic diagram of a multi-loop wireless slip ring system according to the present invention.
Fig. 2 is a flow chart of a channel adaptation method according to the present invention.
FIG. 3 is a schematic diagram of a test signal according to the present invention.
Fig. 4 is a schematic diagram of the channel frequency response characteristics calculated in the present invention.
Detailed Description
The technical means adopted by the invention to achieve the predetermined object of the invention are further described below with reference to the drawings and the preferred embodiments of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a multi-loop wireless slip ring system 1 according to the present invention. The multi-channel wireless slip ring system 1 in fig. 1 comprises a first port 110, a controller 130, a wireless slip ring device 131 and a second port 120. The first port 110 includes a first processor 111 and a first signal processing module 112. The second port 120 includes a second processor 121 and a second signal processing module 122. The rotor end of the wireless slip ring device 131 is connected to the first signal processing module 112, the first signal processing module 112 is used for signal reception, signal modulation, signal demodulation, and signal transmission, and the first processor 111 is used for arithmetic processing, so that the first port 110 can process signals on multiple loops. The wireless slip ring device 131 at least includes a rotor, N conductive loops, and a conductive brush, wherein the rotor is connected to the first port 110 through a rotor wire, a non-contact radio wave transmission structure is provided between the conductive brush and the conductive loops, and a brush wire of the conductive brush is connected to the second port 120 through a stator wire. The stator end of the wireless slip ring device 131 is connected to the second signal processing module 122, the second signal processing module 122 is used for signal receiving, signal modulating, signal demodulating, and signal transmitting, and the second processor 121 is used for arithmetic processing, so that the second port 120 can process signals on multiple loops. The communication between the first port 110 and the second port 120 may be simplex, half-duplex, or full-duplex.
Referring to fig. 2, fig. 2 is a flow chart of a channel adaptation method according to the present invention. The channel self-adaption realization method comprises the following steps:
step 101, check if the device, system connection, power supply, etc. are ready.
In step 102, the first port sends a communication request instruction to the second port to hope to suggest a communication channel.
103, the first port judges whether the reply of the second port is received, and if the first port receives the reply of the second port, step 104 is executed; if the first port does not receive the reply from the second port, the process returns to step 101. After the first port sends a communication request to the second port, the first port waits and confirms whether a request reply is received from the second port in step 102. If the one-way communication is successfully established, the second port replies after receiving the communication request of the first port, and the first port receives a reply instruction of the second port; if the communication is failed to be established, the first port does not receive a reply instruction from the second port, and at this time, the process returns to step 101 to check whether the working conditions of the device periphery, the system connection, the power supply and the like are ready, and communication is started after the working conditions are checked to be ready.
The first port sends a test signal having a bandwidth to the second port, step 104. The transmitted bandwidth represents the range of the system signal transmission band, which is limited by device cost and device performance. The accuracy of the test signal may be determined by the communication quality requirement of the system, and a plurality of different frequency points (for example, K different frequency points f1, f2, …, fk, K being an integer greater than 1) may be uniformly selected over the bandwidth. As shown in fig. 3, the test signals of different frequency points with the bandwidth of B are shown, wherein the frequency precision is one million hertz (MHz).
And step 105, the second port receives the test signal and carries out channel quality evaluation. The channel quality can reflect the quality of the current channel condition, and the indexes which can be used for reflecting the channel quality include: signal-to-noise ratio, time delay, bit error rate, retransmission rate, air interface rate, signal strength, data throughput, bit error rate, symbol error rate, and the like. In this embodiment, the selection of the frequency point is performed by taking the signal-to-noise ratio index as an example. After the second port receives the test signal, the amplitude (amplitude) of a certain frequency point received by the second port is V2 volts (volts), the amplitude of the interference signal within the bandwidth range is V1 volts, and the second processor of the second port calculates the signal-to-noise ratio (SNR) at each frequency point according to the formula: SNR is 20 × log (V2/V1), and the frequency response characteristic of the channel is calculated. As shown in fig. 4, fig. 4 is a schematic diagram of the channel frequency response characteristics calculated in this embodiment. In fig. 4, we can see the snr of each frequency point in the transmission range of the bandwidth B and the variation trend of the snr in the whole transmission range.
And 106, the second port feeds back the information of the evaluated optimal frequency band or optimal frequency point to the first port 110. Taking the snr index as an example, according to the quality evaluation index value of each channel calculated in step 105, the snrs are sorted from high to low, the frequency band with the highest snr is the best frequency band, the frequency point with the highest snr is the best frequency point, and then the information of the best frequency band and the best frequency point of the channel is screened out. Taking the calculation result in fig. 4 as an example, the optimal frequency band of the channel is the range Δ W between the frequency point f1 and the frequency point f2, and the optimal frequency point is f 0. And the second port feeds back the obtained information of the optimal frequency band and the optimal frequency point to the first port. It should be noted that, according to the embodiments shown in fig. 3 and fig. 4, the present invention implements channel scanning through multiple frequency points f1, f2, …, fk, and then selects the best frequency point f0 or the best frequency band (for example, the frequency band between the frequency point f1 and the frequency point f 2) for signal transmission; the invention is suitable for multi-channel transmission with more than two channels, namely, a plurality of corresponding optimal frequency points or optimal frequency bands are selected aiming at a plurality of channels.
Step 107, judging whether the first port receives the feedback information of the second port, if the first port receives the feedback information of the second port, executing step 108; if the first port does not receive the feedback information of the second port, the process returns to step 101 to check whether the working conditions of the device periphery, system connection, power supply and the like are ready, check whether other temporary faults occur in the device or not, and restart the communication after the faults are eliminated.
And step 108, the first port adjusts the frequency band of the effective signal according to the feedback information of the second port, and sends the effective signal to carry out formal communication.
And step 109, the second port receives the effective signal in the first port, and performs corresponding processing on the received effective signal, so as to realize normal communication between the first port and the second port based on the first loop.
In the above, for the adaptive optimization communication for the first loop, using the same method, we can then implement the channel adaptive optimization for all loops on the wireless slip ring in the same manner.
The channel self-adaption method provided by the invention has the following advantages: (1) when the channel self-adaptive optimization communication in the loop is carried out, only one loop is in communication in each optimization process, the set communication frequency band and communication frequency point are guaranteed to be the best communication frequency band and the best communication frequency point, and the reliability in the channel transmission process is further improved. By the channel self-adaption method, the problem that each loop in a multi-loop slip ring possibly interferes with each other during transmission can be effectively solved. (2) When the loop communication frequency band and the communication frequency point are set, the interference of other uncertain factors in the device where the slip ring is located is considered, and the influence of the environment of the device where the slip ring is located on signal transmission in the transmission process is avoided.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for channel adaptation, comprising the steps of:
step 101, checking whether a device, a system connection and power supply are ready;
102, a first port sends a communication request instruction to a second port;
103, the first port judges whether a reply of the second port is received; if the first port does not receive the reply of the second port, returning to the step 101;
step 104, if the first port receives the reply of the second port, the first port sends a test signal with bandwidth to the second port;
step 105, the second port receives the test signal and performs channel quality evaluation;
step 106, the second port feeds back the information of the evaluated optimal frequency band or optimal frequency point to the first port;
step 107, judging whether the first port receives the feedback information of the second port; if the second port does not receive the feedback information of the second port, returning to the step 101;
step 108, if the first port receives the feedback information of the second port, the first port adjusts the frequency band of the effective signal according to the feedback information of the second port, and sends the effective signal for communication; and
and step 109, the second port receives the valid signal in the first port and processes the received signal.
2. The channel adaptation method of claim 1, wherein in step 104, the bandwidth of the test signal is a range of a transmission band of a system signal.
3. The channel adaptation method of claim 1, wherein in step 104, the accuracy of the test signal is determined according to system communication quality requirements.
4. The channel adaptation method of claim 1, wherein in the step 104, the frequency point of the test signal comprises a plurality of different frequency points uniformly selected over the bandwidth.
5. The channel adaptation method according to claim 1, wherein the index for evaluating the channel quality in step 105 comprises at least one of the following indexes: signal-to-noise ratio, time delay, bit error rate, retransmission rate, air interface rate, signal strength, data throughput, bit error rate, and symbol error rate.
6. The channel adaptation method according to claim 5, wherein when the indicator of the channel quality estimation is a signal-to-noise ratio, the channel quality estimation comprises the steps of: and after receiving the test signal, the second port calculates the signal-to-noise ratio of each frequency point under the channel.
7. The channel adaptation method according to claim 6, wherein the frequency band with the highest signal-to-noise ratio is the optimal frequency band, and the frequency point with the highest signal-to-noise ratio is the optimal frequency point.
8. A wireless slip ring system using the channel adaptation method of claim 1, wherein the wireless slip ring system comprises a first port, a wireless slip ring device and a second port, wherein the first port is a first signal processing module at a rotor end of the wireless slip ring device, and the second port is a second signal processing module at a stator end of the wireless slip ring device; the wireless slip ring device at least comprises a rotor, a conductive slip ring and a conductive brush, wherein a non-contact radio wave transmission structure is arranged between the conductive brush and a conductive loop; the rotor is connected with the first port through a rotor lead, and the brush wires of the conductive brush are connected with the second port through a stator lead.
9. The wireless slip ring system of claim 8 wherein said first port and said second port have at least one of the following functions: the device comprises a signal receiving function, a signal modulating function, a signal demodulating function, a signal transmitting function and an arithmetic processing function.
10. The wireless slip ring system of claim 8, wherein the communication means between said first port and said second port comprises one of: simplex communication, half-duplex communication, and full-duplex communication.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120220141A1 (en) * | 2009-10-09 | 2012-08-30 | Ondal Medical Systems Gmbh | Rotatable electrical coupling and connector therefor |
| CN105699485A (en) * | 2016-01-22 | 2016-06-22 | 钢研纳克检测技术有限公司 | Rotary type ultrasonic flaw detection device based on radio frequency/microwave technology |
| CN208862337U (en) * | 2018-08-21 | 2019-05-14 | 浙江中杭电子有限公司 | Conducting slip ring |
| CN112654057A (en) * | 2020-12-16 | 2021-04-13 | 西安烽火电子科技有限责任公司 | Bandwidth and rate self-adaptive communication method based on channel detection |
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- 2021-06-11 CN CN202110652000.XA patent/CN113541831B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120220141A1 (en) * | 2009-10-09 | 2012-08-30 | Ondal Medical Systems Gmbh | Rotatable electrical coupling and connector therefor |
| CN105699485A (en) * | 2016-01-22 | 2016-06-22 | 钢研纳克检测技术有限公司 | Rotary type ultrasonic flaw detection device based on radio frequency/microwave technology |
| CN208862337U (en) * | 2018-08-21 | 2019-05-14 | 浙江中杭电子有限公司 | Conducting slip ring |
| CN112654057A (en) * | 2020-12-16 | 2021-04-13 | 西安烽火电子科技有限责任公司 | Bandwidth and rate self-adaptive communication method based on channel detection |
Non-Patent Citations (1)
| Title |
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| 余晶晶等: "高速滑环引电器研制关键技术分析", 《装备制造技术》 * |
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