CN106685472B - A kind of low time delay highly-reliable transmission method of the urgent security information of vehicle - Google Patents
A kind of low time delay highly-reliable transmission method of the urgent security information of vehicle Download PDFInfo
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- CN106685472B CN106685472B CN201611088379.1A CN201611088379A CN106685472B CN 106685472 B CN106685472 B CN 106685472B CN 201611088379 A CN201611088379 A CN 201611088379A CN 106685472 B CN106685472 B CN 106685472B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000007480 spreading Effects 0.000 claims abstract description 69
- 238000001228 spectrum Methods 0.000 claims abstract description 35
- 230000006854 communication Effects 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims abstract description 23
- 239000000969 carrier Substances 0.000 claims abstract description 7
- 230000000631 nonopiate Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 10
- 230000001413 cellular effect Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 230000006855 networking Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a kind of low time delay highly-reliable transmission methods of the urgent security information of vehicle, comprising: vehicle chooses emergency safety information and sends used spreading code and pilot tone, and is periodically updated;Vehicle is spread using emergency safety information of the spreading code to generation, and spread-spectrum code chip is mapped on all subcarriers of vehicle communication frequency range, and with scheduling non-urgent information on sub-carriers is nonopiate is superimposed;Neighbours' vehicle carries out blind recognition to the transmission vehicle of emergency safety information, obtains the spreading code of the transmission vehicle of emergency safety information;Neighbours' vehicle receives the signal transmitted on the subcarrier after channel decaying, is handled using iterative interference cancellation algorithm signal is received, and obtain emergency safety information using the spreading code of the transmission vehicle of emergency safety information.Compared with prior art, the present invention has many advantages, such as low propagation delay time, high reliablity of emergency safety information and the normal transmitting for not influencing non-emergent security information.
Description
Technical field
The present invention relates to the inter-vehicular communication technologies in car networking, more particularly, to a kind of the low of the urgent security information of vehicle
Time delay highly-reliable transmission method.
Background technique
Vehicle active safety is the key that one of car networking application field, has high real value, is much led to
Believe the concern of device manufacturer and automobile vendor.European Telecommunication Standardization Association (European Telecommunications
Standards Institute, ETSI) in standard technique document TS102638 (Basic set of application
Definitions it makes definitions in) to various car networking active safety application scenes, in standard technique document TS302665
The two kinds of security information of (Communication Architecture) Playsization, is the cooperation of cyclical transmission respectively
The decentralized environment notification information of perception information (Cooperative awareness message, CAMs) and event triggering
(Decentralized Environmental Notification Messages,DENMs)。
In these two types of security information, most information is not very harsh to delay requirement, for example, traffic efficiency is believed
Breath and entertainment information etc., data volume is larger, but delay requirement is low.If communicated based on cellular network architecture, have
The vehicle of such data transfer demands can be waited to network application wireless channel by according to power according to normal communication process
It is scheduled again.
On the other hand, in vehicle communication, there is requirement of some information to delay and reliability very harsh, for example, vehicle
It collides, blow out, the information such as emergency brake, needing in a very short period of time with other vehicles around high reliability notice,
So that other vehicles take corresponding risk avoidance measures.However, vehicle competition connects in the Ad hoc mode based on 802.11p agreement
Enter channel, when more vehicle there are data transfer demands, is difficult to meet requirement of the emergency safety information to time delay.And to base
In terminal direct communication (D2D) mode of cellular network, although current 3gpp standard 23.703 define it is direct suitable for vehicle
The D2D framework of communication, but for radio resource allocation mode most crucial in direct communication between terminals, newest 3gpp physics
Layer standard remains that the vehicle of data transfer demands first to network application wireless channel, obtains radio resource and retransmits later
Information (that is, data are directly transmitted between vehicle, control information still passes through cellular network), this process can generate certain prolong
When, the delay requirement of emergency safety information can not be met;In addition, being transformed into connected state if vehicle is in disconnected state
Time can exceed that 100ms, this greatly increases the propagation delay time of emergency safety information.
Summary of the invention
The purpose of the present invention is provide a kind of low time delay highly-reliable transmission of urgent security information of vehicle regarding to the issue above
Method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of low time delay highly-reliable transmission method of the urgent security information of vehicle, which comprises
1) vehicle chooses emergency safety information and sends used spreading code and pilot tone, and is periodically updated;
2) spreading code that vehicle is chosen using step 1) spreads the emergency safety information of generation, and spread-spectrum code chip is reflected
Be mapped on the subcarrier of vehicle communication frequency range, and with scheduling non-urgent information on sub-carriers is nonopiate is superimposed;
3) neighbours' vehicle carries out blind recognition to the transmission vehicle of emergency safety information, obtains the transmission vehicle of emergency safety information
Spreading code;
4) neighbours' vehicle receives the signal transmitted in the step 2) sub-carriers after channel decaying, is interfered using iteration
Elimination algorithm is handled signal is received, and obtains emergency safety information using the spreading code that step 3) obtains.
The step 1) specifically:
11) vehicle accesses vehicle network, and the beacon of a hop neighbor vehicle is received in a beacon sending cycle;
12) beacon for the hop neighbor vehicle that vehicle is received according to step 11), obtains the spread spectrum of a hop neighbor vehicle
Code;
13) vehicle chooses the code word not used by a hop neighbor vehicle from system spread-spectrum code book, as spreading code
It sends, and obtains the corresponding pilot tone of the spreading code;
14) vehicle accesses vehicle network, receives the hop neighbor vehicle in next beacon sending cycle in the process of running
Beacon, judges whether there is vehicle identical with itself spreading code, if then entering step 15), if otherwise return step 14);
15) vehicle chooses the code word being all different with a hop neighbor vehicle from system spread-spectrum code book, as new
Spreading code is sent, and obtains return step 14 after the corresponding pilot tone of the spreading code).
The building process of the system spread-spectrum code book specifically:
111) using the channel sub-carrier quantity of vehicle communication frequency range as the length N of spreading code code word;
112) using the maximum value of one hop neighbor quantity of vehicle as the quantity M of spreading code in spread spectrum code book;
113) ensure M spreading code pairwise orthogonal, obtain system spread-spectrum code book.
The step 2) specifically:
21) vehicle is when needing to send emergency safety information, urgent peace of the spreading code chosen using step 1) to generation
Full information carries out Direct Sequence Spread Spectrum, obtains corresponding spread-spectrum code chip;
22) pattern for the pilot tone chosen according to step 1), determines pilot sub-carrier and carries pilot tone;
23) spread-spectrum code chip is mapped on all non-pilot subcarriers of vehicle communication frequency range by vehicle.
The step 3) specifically:
31) vehicle that neighbours' vehicle is jumped to one in range carries out channel estimation, obtains the power of each channel;
32) power of each channel is compared by neighbours' vehicle with pre-determined threshold, and the power of channel is greater than pre-determined threshold
Vehicle be emergency safety information transmission vehicle;
33) neighbours' vehicle obtains corresponding spreading code from the beacon of the transmission vehicle of urgent security information.
The step 4) specifically:
41) neighbours' vehicle receives the signal transmitted in the step 2) sub-carriers after channel decaying, is not dispatching
Emergency safety information corresponding with corresponding subcarrier is directly acquired on the subcarrier of non-urgent information;
42) emergency safety information is considered as noise, obtained just by neighbours' vehicle on the subcarrier that scheduled non-urgent information
The non-urgent information of beginning, and circulation is initially entered, record initial cycle number is 0;
43) it after neighbours' vehicle subtracts non-urgent information in the reception signal of step 41), is obtained using step 3) urgent
The spreading code despreading of the transmission vehicle of security information, obtains emergency safety information corresponding with corresponding subcarrier;
44) what neighbours' vehicle subtracted that step 43) obtains in the reception signal of step 41) is corresponding with corresponding subcarrier tight
After anxious security information, demodulation obtains non-urgent information;
45) cycle-index is added 1 by neighbours' vehicle, judges whether cycle-index reaches setting value, if then end step 4),
If otherwise return step 43).
Compared with prior art, the invention has the following advantages:
(1) after vehicle generates emergency safety information, emergency safety information is subjected to Direct Sequence Spread Spectrum with spreading code, is expanded
It opens up on all subcarriers of vehicle communication frequency range, compared with prior art, without spending the time to obtain radio resource, subtracts significantly
The time delay that small emergency safety information is sent.
(2) emergency safety information is mapped on subcarrier after Direct Sequence Spread Spectrum, and emergency safety will be received by receiving vehicle
The nonopiate superposed signal of information and non-urgent information, since after Direct Sequence Spread Spectrum, the power of each chip is very low, knot
Close iterative interference cancellation algorithm, the transmission reliability of non-urgent information is by being influenced very little.
(3) Direct Sequence Spread Spectrum is that emergency safety information brings spreading gain, while utilizing iterative interference cancellation algorithm,
The interference on subcarrier can be eliminated, therefore ensure that the reliability of emergency safety information.
(4) any two spreading code in system spread-spectrum code book is orthogonal, ensure that the spreading code of each vehicle is different,
The emergency safety information that can be sent to different vehicle distinguishes.
(5) spreading code can using the sequences such as Walsh sequence, M sequence and Golden sequence, can according to the actual situation into
Row selection, practical performance are strong.
Detailed description of the invention
Fig. 1 is the vehicle interior architecture diagram for being applicable in the low time delay highly-reliable transmission method of the urgent security information of vehicle;
Fig. 2 is flow chart of the method for the present invention;
Fig. 3 is the position view of vehicle in embodiment;
Fig. 4 is whether there is or not in the case of the nonopiate transmission of emergency safety information, and the transmission error rates of non-emergent security information compare
Figure;
Fig. 5 is the bit error rate comparison diagram of non orthogonal transmissions in orthogonal transmission emergency safety information and the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Vehicle configuration cellular network interface can be used as mobile terminal transmitting and receive data, as shown in Figure 1.System point
Dedicated frequency band (such as distributing 5MHz in the frequency range of 2.6G) with certain section of frequency band as vehicle communication.Vehicle is in the dedicated frequency band
On directly to neighbours' vehicle broadcast message, as long as neighbours' vehicle received signal to noise ratio is more than certain threshold value, can successfully connect
Receive data.The data that vehicle generates are divided into emergency safety according to specific standard (standard can be arranged according to actual scene)
Information and non-urgent information.Vehicle periodically sends beacon message, and so as to adjacent vehicle identification, the sending cycle of beacon is
100ms~1s.
As shown in Fig. 2, the purpose of the present embodiment is to provide a kind of low time delay highly-reliable transmission of urgent security information of vehicle
Method, comprising the following steps:
1) vehicle is chosen and updates spreading code and pilot tone used in the transmission of emergency safety information:
If vehicle sends emergency safety information, specific spreading code and pilot tone are used.Using spreading code purpose it
One is to discriminate between the emergency safety information of different vehicle transmission, so the vehicle in a jump range must use mutually orthogonal spread spectrum
Code, and each vehicle both knows about other vehicles within the scope of a jump use which spreading code and pilot tone.
Assuming that the broadcast data transmission channel of vehicle communication frequency range includes the subcarrier of N number of non-pilot, and vehicle one is jumped
Neighbours' quantity is up to M (M is necessarily less than equal to N), then the length of spreading code code word is N, the available code book of system is defined as M
A mutually orthogonal code word, this M orthogonal code can use Walsh column, M sequence, Golden sequence etc..Due to pilot tone
Sequence does not need orthogonal, so in this patent, generates M pilot signal, and the fixation pair of each pilot tone according to 3gpp standard
Answer a spreading code.In following vehicle blind recognitions, as long as receiving vehicle obtains the pilot tone for sending vehicle, its expansion is obtained naturally
Frequency code.
Vehicle sends pilot tone serial number using several bits in the beacon of periodicity sending.After reception of the beacon, vehicle
It can know pilot tone and spreading code used when all hop neighbor vehicles send emergency safety information.
11) the selection process of spreading code and pilot tone is as follows:
Assuming that the current state of system is, the mutually orthogonal spread spectrum code word of the vehicle configuration in all jump ranges.If
There is a vehicle just to start, and access vehicle network, then it is first in (for example, in 100ms) the beacon sending cycle
The beacon of a hop neighbor vehicle is first received, the spreading code code word of a hop neighbor vehicle is obtained, is then selected from system spread-spectrum code book
The code word not used by a hop neighbor vehicle is taken, spreads code word as it.
12) renewal process of spreading code and pilot tone is as follows.
With the operation of vehicle, a hop neighbor vehicle of vehicle changes, and causes the spreading code of vehicle within the scope of a jump may
It is no longer mutually orthogonal.Since vehicle is in each beacon sending cycle, the beacon of a hop neighbor vehicle is all received, as long as having listened to
Other vehicle uses spreading code identical with itself, then change the spreading code of oneself, and one and a hop neighbor are selected from code book
The code word that vehicle is different from, and send in a beacon.In this way, after most two beacon periods, a hop neighbor vehicle
Spreading code will all become mutually orthogonal.
2) vehicle sends emergency safety information:
Non-urgent information according to the D2D standard transmission of 3gpp, directly broadcast between vehicle by data, and cellular base station passes through signaling
Control the foundation and radio resource allocation of link.After vehicle generates non-urgent information, to cellular network application radio resource, and
It is broadcasted on the wireless channel being dispatched to surrounding vehicles.
After vehicle generates emergency safety information, Direct Sequence Spread Spectrum is carried out to this information using spreading code, and will spread spectrum
The information of the N number of chip generated later is launched on N number of subcarrier.In this way, it is assumed that the spreading code of vehicle m is Cm=(Cm1,
Cm2,…,CmN), transmitting signal is xm, then transmission signal of the vehicle m on n-th of subcarrier will be xmCmn.Emergency safety signal
After spread spectrum, signal energy is dispersed on N number of subcarrier, and the signal energy on each subcarrier becomes original 1/N.
Emergency safety information after spread spectrum when being dispatched on each subcarrier, due to portion subcarriers may be scheduled it is non-
Emergence message, therefore what is sent on the portion subcarriers at this time is that emergency safety information and non-urgent information are nonopiate superimposed
Information.
3) neighbours' vehicle sends vehicle to emergency safety information and carries out blind recognition:
On the pilot sub-carrier of vehicle communication frequency range, the signal that neighbours' vehicle receives is to send emergency safety information vehicle
Pilot tone and the vehicle pilot tone that is scheduled on this resource block be superimposed.
Neighbours' vehicle carries out blind recognition, specific method using transmission vehicle of the method based on pilot tone to emergency safety information
It is as follows:
Enable C1Indicate the set of all hop neighbor vehicles on pilot sub-carrier, receiving the pilot signal that receives of vehicle can be with
It indicates are as follows:
Wherein AkIndicate the pilot frequency sequence of k-th of user, hkIndicate that the channel of k-th of user, n indicate noise, IkIt is one
Indicator variable, Ik=1 indicates that k-th of user is sending information, Ik=0 k-th of user of expression does not send information.
Principle in blind recognition based on channel estimation methods is as follows: receiver carries out channel estimation to each user, meter
The power of each channel estimated, provides a thresholding, and channel power is greater than the thresholding, it is believed that active user is place
In state of activation, information is being sent.It identifies after sending vehicle, its spreading code can be obtained from its beacon, uses phase
The spreading code answered receives the emergency safety information of its transmission.
4) neighbours' vehicle receives emergency safety information:
On n-th of subcarrier, the information that neighbours' vehicle receives is the signal and spread spectrum of scheduled vehicle emissions
The superposition of emergency safety information afterwards, is expressed as following formula:
Wherein, h0And x0The vehicle being scheduled on the subcarrier is respectively indicated to send out to the channel and the vehicle for receiving vehicle
The information sent, hm,nIndicate channel of the vehicle of m-th of transmission emergency safety information to reception vehicle, N0For additive Gaussian white noise
Sound.
Detect emergency safety information send vehicle after, receive vehicle use iterative interference cancellation algorithm, first
Emergency safety signal is regarded as noise, normally receives the signal of scheduled vehicle.Then, it is subtracted on corresponding subcarrier scheduled
The signal of vehicle, the spreading code for reusing emergency safety information transmission vehicle de-spread the signal on all subcarriers,
And demodulate and obtain emergency safety information, it is demodulated again from superposed signal using the emergency safety information that demodulation obtains later non-tight
Anxious information, more accurate signal receives in order to obtain, and the above process carries out iteration several times, in simulations, iteration most 4 times
Later, the bit error rate will converge to stationary value.
According to the above method, by taking one based on the vehicle communication network of lte-a system D2D as an example, to illustrate emergency safety
How information sends, and how by a received method of hop neighbor vehicle.System is distributed in 2.6G frequency range in the present embodiment
2MHz bandwidth all configures an antenna dedicated for the broadcast communication between vehicle, all vehicles.
Scene as shown in Figure 3, in the operation of vehicle, vehicle 1,2,3,4 is within the scope of a mutual jump, and is made
With different spreading code and pilot frequency sequence, beacon sending cycle is 100ms.Spreading code code word size N=128, code book is by M=20
A mutually orthogonal Walsh Sequence composition.With the operation of vehicle, vehicle 5 enters a jump communication range of vehicle 3 and 4, and
And vehicle 5 and vehicle 3 use identical spreading code and pilot frequency sequence.Assuming that the beacon that the first uppick vehicle 5 of vehicle 3 is sent, is obtained
Its spreading code and pilot frequency sequence are known, then vehicle 3 will search for a new spreading code, the spreading code in spreading code code book immediately
It is different from the spreading code of vehicle 1,2,4,5, and broadcasts itself spreading code and pilot frequency sequence in a beacon.By above-mentioned
Renewal process, it is ensured that a hop neighbor vehicle uses mutually orthogonal spreading code.
At a certain moment, vehicle 1 is blown out suddenly, needs one hop neighbor vehicle of emergency notice.Assuming that current vehicle 5 is being broadcasted
Non-urgent information, occupies the 1 to 10th RB of vehicle communication frequency band, and pilot tone is sent using single antenna downlink specified in 36.211
Reference signal maps pattern.The generation of vehicle 1 is blown out after information, using its spreading code by signal spread-spectrum, and maps directly to 2M
Emit on all subcarriers of bandwidth, pilot tone is also reflected using single antenna downlink reference signal as defined in 36.211 on each RB
Penetrate pattern.In this way, the emergency safety information of vehicle 1 will be nonopiate folded with the non-urgent information of vehicle 5 on the 1 to 10th RB
Add, by the strong jamming of 5 non-urgent information of vehicle, and it is interference-free on other RB.
Vehicle 2,3 and 4 monitors always vehicle communication frequency range when no information is sent, and receives vehicle communication frequency range
On broadcast message.In each time slot, vehicle 2,3 and 4 judges whether there is vehicle according to blind recognition algorithm and is sending information.Due to
Blind recognition is limited to the vehicle within the scope of a jump, so the operand of blind recognition and little.Vehicle 2,3 and 4 is calculated by blind recognition
Method has identified that vehicle is sending emergency safety information, then uses iterative interference cancellation algorithm, and demodulation obtains the transmission of vehicle 1
It blows out information.
1 emergency safety information of Fig. 4 simulation analysis vehicle transmits the influence transmitted to 5 non-urgent information of vehicle.It is tied from emulation
Fruit can be seen that whether emergency safety information sends, and the transmission error rates variation of 5 non-urgent information of vehicle less, shows that it can
By transmission by being influenced very little.
Fig. 5 simulation analysis vehicle 1 normally obtains orthogonal channel and sends emergency safety information and use method in the present invention
Obtained reception bit error rate comparison.From simulation result as can be seen that its transmission error rates differs very little, this shows emergency safety
Information can realize reliable transmission with lower time delay.
Claims (6)
1. a kind of low time delay highly-reliable transmission method of the urgent security information of vehicle, which is characterized in that the described method includes:
1) vehicle chooses emergency safety information and sends used spreading code and pilot tone, and is periodically updated;
2) spreading code that vehicle is chosen using step 1) spreads the emergency safety information of generation, and spread-spectrum code chip is mapped to
On the subcarrier of vehicle communication frequency range, and with scheduling non-urgent information on sub-carriers is nonopiate is superimposed;
3) neighbours' vehicle carries out blind recognition to the transmission vehicle of emergency safety information, obtains the transmission vehicle of emergency safety information
Spreading code;
4) neighbours' vehicle receives the signal transmitted in the step 2) sub-carriers after channel decaying, utilizes iterative interference cancellation
Algorithm is handled signal is received, and obtains emergency safety information using the spreading code that step 3) obtains.
2. the low time delay highly-reliable transmission method of the urgent security information of vehicle according to claim 1, which is characterized in that institute
State step 1) specifically:
11) vehicle accesses vehicle network, and the beacon of a hop neighbor vehicle is received in a beacon sending cycle;
12) beacon for the hop neighbor vehicle that vehicle is received according to step 11), obtains the spreading code of a hop neighbor vehicle;
13) vehicle chooses the code word not used by a hop neighbor vehicle from system spread-spectrum code book, sends as spreading code,
And obtain the corresponding pilot tone of the spreading code;
14) vehicle accesses vehicle network, receives the hop neighbor vehicle letter in next beacon sending cycle in the process of running
Mark, judges whether there is vehicle identical with itself spreading code, if then entering step 15), if otherwise return step 14);
15) vehicle chooses the code word being all different with a hop neighbor vehicle from system spread-spectrum code book, as new spread spectrum
Code is sent, and obtains return step 14 after the corresponding pilot tone of the spreading code).
3. the low time delay highly-reliable transmission method of the urgent security information of vehicle according to claim 2, which is characterized in that institute
State the building process of system spread-spectrum code book specifically:
111) using the channel sub-carrier quantity of vehicle communication frequency range as the length N of spreading code code word;
112) using the maximum value of one hop neighbor quantity of vehicle as the quantity M of spreading code in spread spectrum code book;
113) ensure M spreading code pairwise orthogonal, obtain system spread-spectrum code book.
4. the low time delay highly-reliable transmission method of the urgent security information of vehicle according to claim 1, which is characterized in that institute
State step 2) specifically:
21) for vehicle when needing to send emergency safety information, the spreading code chosen using step 1) believes the emergency safety of generation
Breath carries out Direct Sequence Spread Spectrum, obtains corresponding spread-spectrum code chip;
22) pattern for the pilot tone chosen according to step 1), determines pilot sub-carrier and carries pilot tone;
23) spread-spectrum code chip is mapped on all non-pilot subcarriers of vehicle communication frequency range by vehicle.
5. the low time delay highly-reliable transmission method of the urgent security information of vehicle according to claim 1, which is characterized in that institute
State step 3) specifically:
31) vehicle that neighbours' vehicle is jumped to one in range carries out channel estimation, obtains the power of each channel;
32) power of each channel is compared by neighbours' vehicle with pre-determined threshold, and the power of channel is greater than the vehicle of pre-determined threshold
Be emergency safety information transmission vehicle;
33) neighbours' vehicle obtains corresponding spreading code from the beacon of the transmission vehicle of urgent security information.
6. the low time delay highly-reliable transmission method of the urgent security information of vehicle according to claim 1, which is characterized in that institute
State step 4) specifically:
41) neighbours' vehicle receives the signal transmitted in the step 2) sub-carriers after channel decaying, non-tight in no scheduling
Emergency safety information corresponding with corresponding subcarrier is directly acquired on the subcarrier of anxious information;
42) emergency safety information is considered as noise, obtained initial by neighbours' vehicle on the subcarrier that scheduled non-urgent information
Non-urgent information, and circulation is initially entered, record initial cycle number is 0;
43) after neighbours' vehicle subtracts non-urgent information in the reception signal of step 41), the emergency safety that is obtained using step 3)
The spreading code despreading of the transmission vehicle of information, obtains emergency safety information corresponding with corresponding subcarrier;
44) neighbours' vehicle subtracts the urgent peace corresponding with corresponding subcarrier that step 43) obtains in the reception signal of step 41)
After full information, demodulation obtains non-urgent information;
45) cycle-index is added 1 by neighbours' vehicle, judges whether cycle-index reaches setting value, if then end step 4), if not
Then return step 43).
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