CN105391782A - V2I/V2V Internet-of-things system based on cognitive OFDM and method thereof - Google Patents
V2I/V2V Internet-of-things system based on cognitive OFDM and method thereof Download PDFInfo
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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
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- 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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- H—ELECTRICITY
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- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
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Abstract
The invention discloses a V2I/V2V Internet-of-things system based on cognitive OFDM, comprising on-board units and roadside units. The on-board units and the roadside units are configured to carry out wireless communication based on an ISM frequency band to transmit video, voice and text data and provide traffic safety information and traffic condition information for drivers. The invention further provides a mobile ad hoc network information transmission method comprising the following steps: an information collection module starts collecting video, voice, text and other information, and a control host module compresses, codes, packages and modulates the information and sends the modulated information to a sending queue; a sender notifies a receiver in a control channel that the data is about to be sent; the receiver performs spectrum sensing, and feeds a carrier frequency and a subcarrier group of good channel quality currently back to the sender through the control channel; the receiver receives a packet of information, and demodulates and checks the information to obtain check information; and the receiver records the number of times of consecutive packet loss, and decides whether to perform spectrum sensing according to the number of times of packet loss.
Description
Technical field
The present invention relates to car networking arenas, particularly relate to a kind of V2V/V2I car networked system based on cognitive OFDM.
Background technology
Internet of Things utilizes advanced communication and networking technology to be linked to be network by between object, and is incorporated among existing the Internet, makes people can be undertaken alternately, realizing the seamless fusion of man-machine substance environment by the information of wide area, multidimensional in Internet of Things and real world.
In the fast development of Internet of Things, under the background that urban traffic blocking and sustainable development require, car networking has been evolved to the epoch of IoV (InternetofVehicles) by vehicular ad hoc network (VehicularAdHocNetwork, VANET).The technology such as WAVE (WirelessAccessinVehicularEnvironment) agreement based on IEEE802.11p, the Drive-thru based on IEEE802.11b are all that VANET proposes numerous effective communication and networking plan.
In February, 2014, U.S. traffic safety management administration announces, Obama administration mandatory requirement zero-mileage car and light truck will load radio transponder, and pushing vehicle-Che is interconnected, to cut down traffic accidents and personnel and property loss.At present, Google carries out the standardization that OAA (OpenAutomotiveAlliance) plans to build based on Android device.Apple also develops the iOS7 operating system of automobile specified specially cooperatively with Honda and Hyundai Motor Co..
The shortcomings such as the concurrent speed of the cellular network that current main flow uses only has 100Mbps, and in car, data total amount just increases with exponential magnanimity, and in car, data are badly in need of shunting, but wifi technology is faced with again link instability, and handover delay is long.Car networking is badly in need of finding a kind of network technology to carry out the transmission of bulk information.
In addition, cognitive radio can the change of continuous cognitive radio communication environment, and is adapted to the change of wireless environment by the messaging parameter adjusting therein adaptively.Orthogonal frequency division multiplexi (OFDM), has anti-multipath, frequency efficiency high, is to think than the good platform being easier to the radio system realized at present in the world.
Through finding existing literature search, Chinese Patent Application No. is: CN201410801787, name is called: a kind of based on the vehicle-mounted wifi network system under car networking framework, relates to a kind of based on the vehicle-mounted wifi network system under car networking framework, belongs to vehicular wireless network field.But the switch speed of wifi is comparatively slow, is not suitable for In-vehicle networking and switches fast.Chinese Patent Application No. is: CN201410759270, name is called: a kind of data transmission device based on OFDM, disclose a kind of data transmission device based on OFDM, adopt high-speed dsp and corresponding software programming, two main frame, twin-channel ruuning situation are carried out detecting and judged, but OFDM technology is not used in car networking arenas, also cognition is not carried out to signal.Above patent does not construct the car networked system based on cognitive OFDM, does not propose the information transferring method based on mobile ad-hoc network yet, has certain limitation.The shortcoming of prior art mainly contains: 1) based on the vehicle-mounted wifi network system under car networking framework, and use wifi as communication mode, handover delay is very long; 2) 4G network capacity is limited, and open vehicle-mounted data amount is out very large, and 4G cellular network is difficult to load; 3) 802.11p agreement, does not carry out dynamic frequency spectrum perception and switching, can not the fine communication environment that must adapt to dynamic change.
Therefore, those skilled in the art is devoted to a kind of V2I/V2V car networked system based on cognitive OFDM of exploitation and method thereof, alleviate the pressure of cellular network resource in short supply at present, compare the access speed that improve network with wifi, and ensure real-time and the reliability of transfer of data.
Summary of the invention
For problems of the prior art, technical scheme of the present invention is for the first two shortcoming, ISM band is used to use orthogonal frequency division multiplexi (OFDM), there is anti-multipath, frequency efficiency high, the more important thing is, this method, handover delay is short, after deployment success, effectively can alleviate the pressure of 4G network.Mobile ad-hoc network information transferring method, the change of continuous cognitive radio communication environment, and the change of wireless environment is adapted to by the messaging parameter adjusting therein adaptively, the error rate can be reduced, improve information throughput.
The present invention takes into full account noise that wireless link faces, interference and fading problem, ensures board units and the board units of surrounding and communicating of roadside unit.Present invention also offers a kind of mobile ad-hoc network information transferring method, thus ensure real-time and the reliability of transfer of data.
For achieving the above object, the invention provides a kind of V2I/V2V car networked system based on OFDM, comprise board units and roadside unit, described board units and described roadside unit are configured to adopt ISM band to carry out radio communication, transmission of video, voice, text data, and be supplied to driver's traffic safety information and traffic related information.
Further, described board units is configured to the information near collection vehicle, and radios to described roadside unit or other board units of surrounding, receives the data that the described roadside unit of surrounding or other board units transmit simultaneously.
Further, described board units comprises information acquisition module, communication module and main control system module, and described information acquisition module comprises camera and microphone, and described information acquisition module is configured to obtain video information and acoustic information; Described communication module is configured to the acoustic information of the video information of camera collection and microphone collection to radio to other board units and roadside unit; Described main control system module is configured to the data processing Information Monitoring, and the data processed are transferred to described communication module.
Further, described board units is configured to cognitive radio channel quality, and described car networked system is operated in best carrier frequency and subcarrier group.
Further, described roadside unit is configured to transmission information to the board units of surrounding and roadside unit, receives the information that the board units of surrounding and roadside unit transmit simultaneously; Described roadside unit is configured to can the real-time road condition information uploaded of real-time reception board units, and described information is transmitted to other roadside unit; Described roadside unit is configured to real-time road, and Weather information is handed down to neighbouring board units; Described roadside unit is configured to monitor radio communication quality in real time, carries out frequency spectrum perception, and described car networked system is operated in best carrier frequency and subcarrier group.
Present invention also offers a kind of mobile ad-hoc network information transferring method, comprise following steps:
The first step, provides board units and roadside unit, configuration wireless communication parameters, device numbering;
Second step, information acquisition module starts to gather video, sound, the information such as text, and main control system module is carried out compressing, encodes, encapsulates, modulated, by the direct information transmit queue after modulation;
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data;
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step;
5th step, receiving terminal carries out frequency spectrum perception, and by good for current channel quality carrier frequency and subcarrier group, feeds back to transmitting terminal by control channel;
6th step, transmitting terminal, according to the feedback data of receiving terminal, the carrier frequency of specifying and subcarrier group sends the video of a packet, sound or text message;
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times;
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this;
9th step, repeats the 5th step to the 8th step, until complete transfer of data.
Further, described wireless communication parameters comprises the number of OFDM channel and corresponding carrier frequency, IQ speed, modulation /demodulation parameter, filter parameter, information packet parameter, reply data bag parameter; Described device numbering is configured to the board units distinguished by different numberings and roadside unit.
Further, the 7th step concrete steps are:
7.1. check information, receiving terminal carries out demodulation to reception packet, and CRC check, generate check information;
7.2. channel switching information, main control system finds packet demodulation mistake, then can record cumulative error number of times, when cumulative error number of times reaches certain threshold value, illustrates that channel disturbance is serious, must carry out channel switching; First receiving terminal then carries out Energy-aware to each carrier frequency, generates carrier frequency according to the minimum access principle of channels interference power, then according to the energy of subcarrier group, switches the subcarrier group of OFDM.
Further, the 8th step concrete steps are:
8.1. according to channel switching information, the carrier frequency that the next cycle uses and subcarrier group is determined;
8.2. according to check information, determine that the next cycle sends next packet or retransmits a upper packet;
8.3. the continuous expired times of response message reach certain threshold value, show that link-quality declines, then transmitting terminal adds high-power, improve communication quality, and response message time-out, retransmits a upper packet.
Present invention also offers a kind of mobile ad-hoc network information transferring method, comprise following steps:
The first step, provides board units and roadside unit, configuration wireless communication parameters, device numbering;
Second step, information acquisition module starts to gather video, sound, the information such as text, and main control system module is carried out compressing, encodes, encapsulates, modulated, by the direct information transmit queue after modulation;
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data;
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step;
5th step, transmitting terminal carries out frequency spectrum perception, and informs receiving terminal by control channel;
6th step, the carrier frequency of specifying and subcarrier group sends the video of a packet, sound or text message;
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times;
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this;
9th step, repeats the 5th step to the 8th step, until complete transfer of data.
The invention provides a kind of V2I based on OFDM, V2V car networked system, comprise board units (OBU) and roadside unit (RSU), OBU and RSU adopts ISM band to carry out radio communication, the information such as transmission of video, voice, text, and be supplied to the information such as driver's traffic safety and traffic, as Fig. 1.
Board units, the information near collection vehicle, and radio to around roadside unit or board units part, receives the data that they transmit simultaneously.Board units comprises information acquisition module, communication module and main control system module.The hardware devices such as information acquisition module comprises camera, microphone, in order to obtain video information and acoustic information.Communication module is for radioing to other board units and roadside unit by the acoustic information of the video information of camera collection and microphone collection.Main control system is mainly used to the data processing Information Monitoring, and gives communication module by the data processed.Board units can cognitive radio channel quality, makes system works in the carrier frequency and subcarrier group of the best.
Roadside unit, for sending information to the board units of surrounding and roadside unit, receives the information that they transmit simultaneously.Roadside unit can the real-time road condition information uploaded of real-time reception board units, and information is transmitted to other roadside unit.Roadside unit can by real-time road, and the information such as weather are handed down to neighbouring board units.Roadside unit can monitor radio communication quality in the moment, carries out frequency spectrum perception, makes system works in the carrier frequency and subcarrier group of the best.
As shown in Figure 3, present invention also offers a kind of information transferring method of mobile ad-hoc network.The information transferring method of mobile ad-hoc network provided by the invention, by the signal to noise ratio of autonomous each subcarrier of perception OFDM, by the minimum access principle of channels interference power, autonomous adjustment OFDM carrier frequency and subcarrier group; Controlled by power and relay forwarding solution wireless signal fading problem; Thus ensure real-time and the reliability of transfer of data.Wherein transmitting terminal and receiving terminal are all likely board units and roadside unit.
The method comprises the following steps:
The first step, board units, roadside unit configuration wireless communication parameters, device numbering etc.
Described wireless communication parameters mainly comprises the number of OFDM channel and corresponding carrier frequency, IQ speed; Also has modulation /demodulation parameter in addition, filter parameter, information packet parameter, reply data bag parameter etc.Described device numbering refers to the board units distinguished by different numberings and roadside unit.
Second step, information acquisition module starts to gather video, sound, the information such as text.Main control system module is carried out compressing, encodes, encapsulates, is modulated, by the direct information transmit queue after modulation.
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data.
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step.
5th step, receiving terminal carries out frequency spectrum perception, and by good for current channel quality carrier frequency and subcarrier group, feeds back to transmitting terminal by control channel.
6th step, transmitting terminal, according to the feedback data of receiving terminal, the carrier frequency of specifying and subcarrier group sends video, sound or the text message of a packet.
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times.
7.1. check information, receiving terminal carries out demodulation to reception packet, and CRC check, generate check information.
7.2. channel switching information, main control system finds packet demodulation mistake, then can record cumulative error number of times, when cumulative error number of times reaches certain threshold value, illustrates that channel disturbance is serious, must carry out channel switching.First receiving terminal then carries out Energy-aware to each carrier frequency, generates carrier frequency according to the minimum access principle of channels interference power, then according to the energy of subcarrier group, switches the subcarrier group of OFDM.
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this.Concrete steps are:
8.1. according to channel switching information, the carrier frequency that the next cycle uses and subcarrier group is determined.
8.2. according to check information, determine that the next cycle sends next packet or retransmits a upper packet.
8.3. the continuous expired times of response message reach certain threshold value, show that link-quality declines, then transmitting terminal adds high-power, improve communication quality, and response message time-out, retransmits a upper packet.
9th step, repeats step 5 to step 8, until complete transfer of data.
The invention has the advantages that, take into full account that the network link that faces of car is unstable, noise, interference, the problems such as topological structure is variable, devise a kind of V2I based on OFDM, V2V car networked system, radio communication can be carried out in ISM band, the information such as transmission of video, voice, text, and be supplied to the information such as driver's traffic safety and traffic.Alleviate the pressure of cellular network resource in short supply at present, compare the access speed that improve network with wifi.Self-organization network information transfer method provided by the invention simultaneously, by the signal to noise ratio of autonomous each subcarrier of perception OFDM, autonomous adjustment OFDM carrier frequency and subcarrier group; Controlled by power and relay forwarding solution wireless signal fading problem; Thus ensure real-time and the reliability of transfer of data.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the system block diagram of a preferred embodiment of the present invention;
Fig. 2 is the system connection layout of a preferred embodiment of the present invention;
Fig. 3 is the method flow diagram of a preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.The present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 2, in this real-time example, two board units all carry in-vehicle wireless communication terminal, terminal is equipped with USB camera, microphone and notebook computer, roadside unit makes purpose processor, carries radio-frequency receiving-transmitting board, its reception for video, sound, Word message and reduction display.
In the process that board units travels at vehicle, carry out data acquisition, transfer data to neighbouring board units, or be uploaded to roadside unit.Board units comprises information acquisition module, communication module and main control system module.The hardware devices such as information acquisition module comprises camera, microphone, in order to obtain video information and acoustic information.Communication module is for radioing to other board units and roadside unit by the acoustic information of the video information of camera collection and microphone collection.Main control system is mainly used to the data processing Information Monitoring, and gives communication module by the data processed.Board units can cognitive radio channel quality, makes system works in the carrier frequency and subcarrier group of the best.
Roadside unit adopts roadside base station platform, carries radio-frequency receiving-transmitting board, for sending information to the board units of surrounding and roadside unit, receives the information that they transmit simultaneously.Roadside unit can the real-time road condition information uploaded of real-time reception board units, and information is transmitted to other roadside unit.Roadside unit can by real-time road, and the information such as weather are handed down to neighbouring board units.Roadside unit can monitor radio communication quality in the moment, carries out frequency spectrum perception, makes system works in the carrier frequency and subcarrier group of the best.
As shown in scheme 3, present invention also offers a kind of information transferring method of mobile ad-hoc network.The information transferring method of mobile ad-hoc network provided by the invention, by the signal to noise ratio of autonomous each subcarrier of perception OFDM, by the minimum access principle of channels interference power, autonomous adjustment OFDM carrier frequency and subcarrier group; Controlled by power and relay forwarding solution wireless signal fading problem; Thus ensure real-time and the reliability of transfer of data.Wherein transmitting terminal and receiving terminal are all likely board units and roadside unit.
The information transferring method of this mobile ad-hoc network comprises the following steps:
The first step, board units, roadside unit configuration wireless communication parameters, device numbering etc.
The present embodiment configures 3 communication channels, carrier frequency is 2.40GHz, 2.41GHz, 2.42GHz, IQ speed 2M, be divided into 256 subcarriers, transmitting power 0dbm, adopt OFDM modulation demodulation mode, up-sampling multiple is 8, formed filter and matched filter are root raised cosine filter, rolloff-factor 0.5, and filter length is 6.
Second step, information acquisition module starts to gather video, sound, the information such as text.Main control system module is carried out compressing, encodes, encapsulates, is modulated, by the direct information transmit queue after modulation.In this example, acoustic information adopts 8 codings; Video adopts dct transform to compress, and adaptive coding, encapsulates according to data packet format, information bit 4096 bit, and after compression, a two field picture needs 4-8 packet to transmit.
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data.Control channel in example chooses 2.38G, supposes that control channel can not take disturbed and for a long time in example.
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step.
5th step, receiving terminal carries out frequency spectrum perception, and by good for current channel quality carrier frequency and subcarrier group, feeds back to transmitting terminal by control channel.First example detects 2.40GHz, 2.41GHz, 2.42GHz tri-carrier center take situation, selected OFDM carrier wave, and 256 of 2M bandwidth subcarriers are divided into 4 sections, systems axiol-ogy 4 subcarrier group take situation, select the subcarrier group that do not take to carry out transfer of data.
6th step, transmitting terminal, according to the feedback data of receiving terminal, the carrier frequency of specifying and subcarrier group sends video, sound or the text message of a packet.
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times.
7.1. check information, receiving terminal carries out demodulation to reception packet, and CRC check, generate check information.In the present embodiment, check information is according to CRC check result, represents that whether verification is correct by 1 bit.
7.2. channel switching information, main control system finds packet demodulation mistake, then can record cumulative error number of times, when cumulative error number of times reaches certain threshold value, illustrates that channel disturbance is serious, must carry out channel switching.Channel switching information is totally 5 bits, and 1 bit represents whether carry out channel switching, and 2 bits represent the object carrier frequency of switching, and 2 bits represent the target sub-carriers group of switching.The present invention flexible configuration channel switching information number of bits can realize multichannel support.Control centre receives packet and verifies, record cumulative error number of times, when cumulative error number of times reaches 8 times, receiving terminal carries out perception to 3 of OFDM centre carrier frequencies, find the channel of minimum energy, then perception is carried out to 4 subcarrier group, if determine access 2.41GHz, subcarrier group 3, then channel switching information is encoded to 10111, receiving terminal is switching channels at once, notifies transmitting terminal by control channel, and waits for the signal of transmitting terminal.
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this.Concrete steps are:
8.1. according to channel switching information, the carrier frequency that the next cycle uses and subcarrier group is determined.
8.2. according to check information, determine that the next cycle sends next packet or retransmits a upper packet.
8.3. the continuous expired times of response message reach certain threshold value, show that link-quality declines, then transmitting terminal adds high-power, improve communication quality, and response message time-out, retransmits a upper packet.
9th step, repeats step 5 to step 8, until complete transfer of data.
In addition, the 5th step in the information transferring method of mobile ad-hoc network of the present invention, receiving terminal carries out frequency spectrum perception, and by good for current channel quality carrier frequency and subcarrier group, feeds back to transmitting terminal by control channel; And the 6th step, transmitting terminal, according to the feedback data of receiving terminal, the carrier frequency of specifying and subcarrier group sends the video of a packet, sound or text message; Following replacement scheme can be had: namely transmitting terminal carries out frequency spectrum perception, and informs receiving terminal by control channel, the carrier frequency of specifying and subcarrier group send video, sound or the text message of a packet.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection range of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. the V2I/V2V car networked system based on OFDM, it is characterized in that, comprise board units and roadside unit, described board units and described roadside unit are configured to adopt ISM band to carry out radio communication, transmission of video, voice, text data, and be supplied to driver's traffic safety information and traffic related information.
2. the V2I/V2V car networked system based on OFDM according to claim 1, it is characterized in that, described board units is configured to the information near collection vehicle, and radio to described roadside unit or other board units of surrounding, receive the data that the described roadside unit of surrounding or other board units transmit simultaneously.
3. the V2I/V2V car networked system based on OFDM according to claim 1, it is characterized in that, described board units comprises information acquisition module, communication module and main control system module, described information acquisition module comprises camera and microphone, and described information acquisition module is configured to obtain video information and acoustic information; Described communication module is configured to the acoustic information of the video information of camera collection and microphone collection to radio to other board units and roadside unit; Described main control system module is configured to the data processing Information Monitoring, and the data processed are transferred to described communication module.
4. the V2I/V2V car networked system based on OFDM according to claim 1, it is characterized in that, described board units is configured to cognitive radio channel quality, and described car networked system is operated in best carrier frequency and subcarrier group.
5. the V2I/V2V car networked system based on OFDM according to claim 1, it is characterized in that, described roadside unit is configured to transmission information to the board units of surrounding and roadside unit, receives the information that the board units of surrounding and roadside unit transmit simultaneously; Described roadside unit is configured to can the real-time road condition information uploaded of real-time reception board units, and described information is transmitted to other roadside unit; Described roadside unit is configured to real-time road, and Weather information is handed down to neighbouring board units; Described roadside unit is configured to monitor radio communication quality in real time, carries out frequency spectrum perception, and described car networked system is operated in best carrier frequency and subcarrier group.
6. a mobile ad-hoc network information transferring method, is characterized in that, comprises following steps:
The first step, provides board units and roadside unit, configuration wireless communication parameters, device numbering;
Second step, information acquisition module starts to gather video, sound, the information such as text, and main control system module is carried out compressing, encodes, encapsulates, modulated, by the direct information transmit queue after modulation;
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data;
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step;
5th step, receiving terminal carries out frequency spectrum perception, and by good for current channel quality carrier frequency and subcarrier group, feeds back to transmitting terminal by control channel;
6th step, transmitting terminal, according to the feedback data of receiving terminal, the carrier frequency of specifying and subcarrier group sends the video of a packet, sound or text message;
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times;
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this;
9th step, repeats the 5th step to the 8th step, until complete transfer of data.
7. mobile ad-hoc network information transferring method according to claim 6, is characterized in that, described wireless communication parameters comprises the number of OFDM channel and corresponding carrier frequency, IQ speed, modulation /demodulation parameter, filter parameter, information packet parameter, reply data bag parameter; Described device numbering is configured to the board units distinguished by different numberings and roadside unit.
8. mobile ad-hoc network information transferring method according to claim 6, is characterized in that, the 7th step concrete steps are:
7.1. check information, receiving terminal carries out demodulation to reception packet, and CRC check, generate check information;
7.2. channel switching information, main control system finds packet demodulation mistake, then can record cumulative error number of times, when cumulative error number of times reaches certain threshold value, illustrates that channel disturbance is serious, must carry out channel switching; First receiving terminal then carries out Energy-aware to each carrier frequency, generates carrier frequency according to the minimum access principle of channels interference power, then according to the energy of subcarrier group, switches the subcarrier group of OFDM.
9. mobile ad-hoc network information transferring method according to claim 6, is characterized in that, the 8th step concrete steps are:
8.1. according to channel switching information, the carrier frequency that the next cycle uses and subcarrier group is determined;
8.2. according to check information, determine that the next cycle sends next packet or retransmits a upper packet;
8.3. the continuous expired times of response message reach certain threshold value, show that link-quality declines, then transmitting terminal adds high-power, improve communication quality, and response message time-out, retransmits a upper packet.
10. a mobile ad-hoc network information transferring method, is characterized in that, comprises following steps:
The first step, provides board units and roadside unit, configuration wireless communication parameters, device numbering;
Second step, information acquisition module starts to gather video, sound, the information such as text, and main control system module is carried out compressing, encodes, encapsulates, modulated, by the direct information transmit queue after modulation;
3rd step, transmitting terminal notifies receiving terminal at control channel, is about to send data;
4th step, transmitting terminal wait acknowledge signal, does not have confirmation signal at the appointed time, then return the 3rd step;
5th step, transmitting terminal carries out frequency spectrum perception, and informs receiving terminal by control channel;
6th step, the carrier frequency of specifying and subcarrier group sends the video of a packet, sound or text message;
7th step, receiving terminal receives the information of a packet, and demodulation verification, obtain check information; Record continual data package dropout number of times, determines whether carry out frequency spectrum perception, so that the switching of OFDM carrier frequency and subcarrier group according to packet loss number of times;
8th step, transmitting terminal receives response message, and demodulation response message, extracts check information respectively, channel switching information; Or response message time-out, then record continuous expired times, carry out dynamic conditioning power with this;
9th step, repeats the 5th step to the 8th step, until complete transfer of data.
Priority Applications (1)
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