CN108173961B - Multi-frequency ASK and FSK coexisting automobile wireless communication method and equipment - Google Patents
Multi-frequency ASK and FSK coexisting automobile wireless communication method and equipment Download PDFInfo
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- CN108173961B CN108173961B CN201810038432.XA CN201810038432A CN108173961B CN 108173961 B CN108173961 B CN 108173961B CN 201810038432 A CN201810038432 A CN 201810038432A CN 108173961 B CN108173961 B CN 108173961B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0479—Communicating with external units being not part of the vehicle, e.g. tools for diagnostic, mobile phones, electronic keys or service stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
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Abstract
The invention discloses an automobile wireless communication mode with multi-frequency ASK and FSK coexisting, which comprises a wireless transmitting component and a wireless receiving component, wherein the wireless transmitting component supports ASK and FSK modulation, the receiving component supports ASK and FSK demodulation, each packet of data transmitted by the wireless transmitting component comprises a plurality of frames of wireless data, the wireless center frequencies of each frame of data in the plurality of frames of wireless data are different, and the plurality of frames of data comprise ASK modulated data frames and FSK modulated data frames. The invention also discloses the automobile electronic equipment using the automobile wireless communication mode. The implementation of the invention can effectively overcome the defects of the communication mode of the original system and improve the anti-interference capability and the communication reliability. The technology can be typically applied to wireless communication of a remote control key of an automobile body controller or a tire pressure monitoring product, or any wireless communication product needing anti-interference, and has wide market prospect.
Description
Technical Field
The invention relates to the field of automobile wireless communication, in particular to an automobile wireless communication mode with multi-frequency ASK and FSK coexisting.
Background
With the rapid development of Chinese economy, the automobile industry has become the pillar industry of national economy, and the automobile quantity in China is nearly 2 hundred million by the end of 2016. The development and planning of the thirteen-five automobile industry provide that the automobile output and sales volume keeps stable growth, and the output and sales scale reaches about 3000 thousands of cars by 2020. Tire pressure monitoring systems, keyless entry and start systems and body control modules in automotive body control systems have gradually become the standard configurations for automobiles. These three systems are equipped with a remote control key or an intelligent key, and the radio frequency communication between the remote control key and the control panel currently adopts a single ASK/FSK modulation mode with fixed frequency, as shown in fig. 1. Although the method is technically mature, under the condition that radio frequency interference of the same frequency or similar frequencies exists between electronic control units in the vehicle body and the surrounding environment of the vehicle, the receiving error rate is high or the communication of the receiving end and the transmitting end is interrupted easily, so that the control units do not act or malfunction is caused, the user experience is greatly reduced, and even potential safety hazards exist. As can be seen from fig. 2, with the increase of the number of automobiles and the popularization of wireless interconnection, the electromagnetic environment around the vehicle becomes more complex, and the problem is more prominent.
At present, the research of research and development institutions and scientific research units in China mostly adopts improvement aiming at a data frame structure and a verification mode, including repeated data frame sending, verification data adding, encryption mode improving and the like, and the measures and the methods can only relieve the problems and do not fundamentally solve the problems, and the methods cannot be used for occasions where concurrent radio frequency interference of wireless communication center frequency exists all the time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wireless communication mode and equipment for an automobile with multi-frequency ASK and FSK.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-frequency ASK and FSK coexisting automobile wireless communication mode comprises a wireless transmitting component and a wireless receiving component, wherein the wireless transmitting component supports ASK and FSK modulation, the receiving component supports ASK and FSK demodulation, each packet of data transmitted by the wireless transmitting component comprises a plurality of frames of wireless data, the wireless center frequency of each frame of data in the plurality of frames of wireless data is different, an ASK modulated data frame and an FSK modulated data frame exist in the plurality of frames of data, and the wireless receiving component identifies and automatically configures parameters of single frame of wireless data and receives each frame of data transmitted by the transmitting component in a polling wireless frequency point, ASK and FSK demodulation mode.
Preferably, the data formats of the multiple frames of wireless data are the same, and the multiple frames of wireless data comprise a preamble segment, a start bit segment and a data segment.
Preferably, the length of the preamble segment is greater than 64 bits, the preamble segment is formed by arranging a plurality of 01, the start bit segment is formed by 10, and the data segment includes a data portion and a data check portion.
Preferably, the wireless center frequencies of each adjacent frame of data in the plurality of frames of wireless data are different by 1 MHz.
Preferably, the multi-frame wireless data is 3, 5, 7 frames.
Preferably, the wireless center frequency point of the intermediate frame of the multi-frame wireless data is 433.92MHz or 315 MHz.
Preferably, when the transmitter part transmits multiple frames of wireless data of each packet of data, the multiple frames of wireless data adopt ASK and FSK staggered modulation modes.
Preferably, the single polling time of the wireless receiving section is less than the transmission time of the preamble segment divided by 2, and divided by the number of combinations of the center frequency, ASK modulation, and FSK modulation of the frame of each packet of data.
Preferably, the time interval between frames and frame data in each packet of data transmitted by the transmitter is the same and fixed.
Preferably, the time interval of frame-to-frame data in each packet of data transmitted by the transmitter is a random number that is an odd multiple of the minimum unit time.
The automobile electronic equipment is in wireless communication between an automobile body controller and a remote control key and/or wireless communication between a tire pressure receiver and a tire pressure detection transmitter.
The invention has the beneficial effects that the invention provides a multi-frequency ASK and FSK coexisting automobile wireless communication mode by analyzing and researching the interference factors and the defects of the existing system modulation mode, can effectively overcome the defects of the original system communication mode and improve the anti-interference capability and the communication reliability. The technology can be typically applied to wireless communication of a remote control key of an automobile body controller or a tire pressure monitoring product, or any new wireless communication product needing anti-interference, is also suitable for upgrading and upgrading products in the stock automobile market, and has wide market prospect.
Drawings
FIG. 1 is a schematic diagram of an ASK/FSK modulated signal;
FIG. 2 is a schematic diagram of the transmitting and receiving components and external electromagnetic interference;
FIG. 3 is a schematic diagram of a single frame wireless data format;
fig. 4 is a schematic diagram of single frequency point time domain wireless data frame transmission;
FIG. 5 is a schematic diagram of a multi-frequency point time domain wireless data frame transmission;
fig. 6 shows three frequency points ASK and FSK interleaved modulation;
wherein f is0.Wireless center frequency point, △ f1~ t4.Is the wireless adjacent data frame to frame time interval.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A multi-frequency ASK and FSK coexisting automobile wireless communication mode comprises a wireless transmitting component and a wireless receiving component, wherein the wireless transmitting component supports ASK and FSK modulation, the receiving component supports ASK and FSK demodulation, each packet of data transmitted by the wireless transmitting component comprises a plurality of frames of wireless data, the wireless center frequency of each frame of data in the plurality of frames of wireless data is different, an ASK modulated data frame and an FSK modulated data frame exist in the plurality of frames of data, and the wireless receiving component identifies and automatically configures parameters of single frame of wireless data and receives each frame of data transmitted by the transmitting component in a polling wireless frequency point, ASK and FSK demodulation mode. As can be seen from the analysis in fig. 4 and fig. 5, the multi-frequency wireless communication has stronger interference immunity than the single-frequency wireless communication under the same transmission frequency.
As shown in fig. 3, the data formats of the multi-frame wireless data are the same, and the multi-frame wireless data comprises a preamble segment, a start bit segment and a data segment. The leading code segment is mainly used for identifying the wireless configuration parameter function of the wireless receiving part, the starting bit segment prompts the receiving part that the leading code segment is ended and the data segment is the transmission content to be received and analyzed, and the receiving part starts to enter the data receiving stage.
The length of the preamble section is larger than 64 bits, the preamble section is formed by arranging a plurality of 01, and the longer the preamble is, the longer the time of the receiving component for identifying the central frequency point and the modulation mode of the frame data is, which is more beneficial to the anti-interference of the system. For example, when the wireless communication data rate is 10kbit/s, and the preamble is equal to 64 bits, the time for identification is 6.4ms, and if each frame contains 3 frames of data, the time for the receiver to identify the wireless center frequency point of a single frame of data is less than 6.4/3 ms. The requirement of the speed of the wireless receiving processor can be met by a common 8/16/32-bit singlechip, and the application of the communication mode is facilitated in the mode; the preamble segment is composed of a plurality of 01 permutations. This is designed for the wireless receiving chip to recognize the data frame. Can be compatible with most wireless receiving chips on the market at present; the start bit segment consists of 10. This is to prompt the wireless receiving chip that the preamble is finished and to prepare for data reception. The data segment includes a data portion and a data check portion. In the implementation, a data check part is added, and in order to eliminate error data in communication, the check can adopt a common sum check or a CRC check.
In the implementation, the difference of the wireless center frequencies of adjacent frames of data in the multi-frame wireless data is 1MHz, otherwise, the cost is increased sharply, in order to control the cost of designed automotive electronic equipment and increase the anti-interference capability, the difference of the center frequencies is 1MHz, and the design can support most of wireless receiving chips on the market, and in combination with fig. 5 or fig. 6, the frequency offset △ f is equal to 1 MHz.
The multi-frame wireless data is 3, 5 and 7 frames. Theoretically, the wireless data of multiple frames can be many, but 7 frames can realize frequencies of 7 different frequency bands, which can sufficiently meet the requirements of automotive electronic products. In order to improve the cost performance of the device, 3, 5 or 7 frames can be adopted according to different interference resistance levels. Fig. 5 or fig. 6 illustrates an example of 3 frames, and the analogy between 5 and 7 frames is repeated.
The wireless center frequency point of the middle frame of the multi-frame wireless data is 433.92MHz or 315 MHz. The frequency band is a frequency band commonly used for remote control key and tire pressure detection at present, and other frequency bands can be implemented.
When the transmitter part transmits multiframe wireless data of each packet of data, an ASK and FSK staggered modulation mode is adopted among the multiframe wireless data. Therefore, the anti-interference capability of the system is stronger, and the probability of the system to become functional communication is increased on the occasion of strong interference. Fig. 6 shows two alternative arrangements for 3 frames, and 5 and 7 frames in sequence.
The single polling time of the radio receiving section is less than the transmission time of the preamble segment divided by 2 and divided by the number of combinations of the center frequency point, ASK modulation and FSK modulation of the frame of each packet of data.
The time interval between frames and frame data in each packet of data transmitted by the transmitter is the same and fixed. The embodiment is mainly applied to the occasions of automobile remote controllers.
The time interval between frames in each packet data transmitted by the transmitter is a random number which is an odd multiple of the minimum unit time. The embodiment is mainly applied to the field of tire pressure monitoring, and because each tire pressure detection system has 4-5 transmitters, the random number is adopted to prevent all frame data in each packet of data sent by the transmitters from colliding, so that the receiving part fails to receive and false alarm is generated.
When the wireless frequency points of the vehicle body controller and the tire pressure monitoring are different, the public multi-frequency-point vehicle wireless communication mode can be respectively utilized, and if the wireless frequency points are the same, the public wireless communication mode can be utilized to set frequency deviation △ f and ASK and FSK arrangement to prevent collision of wireless data, so that the normal work of the vehicle electronic equipment is ensured.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (11)
1. A multi-frequency ASK and FSK coexisting automobile wireless communication method comprises a wireless transmitting component and a wireless receiving component, and is characterized in that the wireless transmitting component supports ASK and FSK modulation, the receiving component supports ASK and FSK demodulation, each packet of data transmitted by the wireless transmitting component comprises a plurality of frames of wireless data, the wireless center frequencies of each frame of data in the plurality of frames of wireless data are different, an ASK modulated data frame and an FSK modulated data frame exist in the plurality of frames of data, and the wireless receiving component identifies and automatically configures parameters of single frame of wireless data and receives each frame of data transmitted by the transmitting component through polling wireless frequency points, ASK and FSK demodulation modes.
2. The method of claim 1, wherein the multifrequency ASK and FSK coexisting vehicle wireless communication method is characterized in that the data formats of the multiframe wireless data are the same, and the multiframe wireless data comprises a preamble segment, a start bit segment and a data segment.
3. The method of claim 2, wherein the preamble segment has a length of more than 64 bits, the preamble segment is composed of a plurality of 01 permutations, the start bit segment is composed of 10, and the data segment includes a data portion and a data check portion.
4. The method of claim 1, wherein the difference between the wireless center frequencies of adjacent frames of data in the plurality of frames of wireless data is 1 MHz.
5. The method of claim 4, wherein the plurality of frames of wireless data are 3, 5, and 7 frames.
6. The multi-frequency ASK and FSK coexisting vehicle wireless communication method of claim 1, wherein the wireless center frequency point of the middle frame of the multi-frame wireless data is 433.92MHz or 315 MHz.
7. The multi-frequency ASK and FSK coexisting automobile wireless communication method as claimed in any one of claims 1 to 6, wherein the wireless transmitting means employs an ASK and FSK interleaved modulation scheme between multiple frames of wireless data when transmitting multiple frames of wireless data of each packet of data.
8. The method of claim 7 wherein the single polling time of the wireless receiver is less than the time of one-half preamble segment divided by the number of combinations of center frequency, ASK modulation and FSK modulation per frame of packet data.
9. The method of claim 8, wherein the time interval between the frames in each packet of data of the wireless transmitter is constant and fixed.
10. The method of claim 9, wherein the time interval between frames in each packet of data of the wireless transmitting means is a random number which is an odd multiple of the minimum unit time.
11. An automotive electronic device using the multi-frequency ASK and FSK coexistence automotive wireless communication method according to claim 10, wherein the automotive electronic device is a wireless communication between a body controller and a remote control key and/or a wireless communication between a tire pressure receiver and a tire pressure detecting transmitter.
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| KR20210103504A (en) * | 2019-01-25 | 2021-08-23 | 텔레폰악티에볼라겟엘엠에릭슨(펍) | Dual modulation transmission in a wireless communication system |
| CN110834498A (en) * | 2019-11-28 | 2020-02-25 | 山东省科学院自动化研究所 | Single-antenna integrated vehicle body control system and wireless communication method |
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