CN105703857A - Full duplex wireless communication method of transmission-perception-reception - Google Patents
Full duplex wireless communication method of transmission-perception-reception Download PDFInfo
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- CN105703857A CN105703857A CN201610005506.0A CN201610005506A CN105703857A CN 105703857 A CN105703857 A CN 105703857A CN 201610005506 A CN201610005506 A CN 201610005506A CN 105703857 A CN105703857 A CN 105703857A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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Abstract
The present invention discloses a full duplex wireless communication method of transmission-perception-reception. The method comprises the following steps of 1 using a receiver to carry out the interference detection within an initial interference perception time slot, if a frequency band is detected to have no interference or lower interference, selecting the frequency band as the working frequency of a current transceiver; 2 using a transmitter to transmit a signal with the working frequency and within a transmission cycle; 3 using the receiver to divide a reception cycle into K time slots equally while the signal is transmitted, and dynamically distributing the time slots to the perception time slots and the reception time slots according to the frequency band interference condition; 4 using the receiver to detect the interference in the frequency band within the perception time slots to select a working frequency band, and utilizing the obtained working frequency band to demodulate the signal within the reception time slots. The method of the present invention can realize the real-time anti-interference, and also enables the system capacity to be improved.
Description
Technical field
The invention belongs to wireless information transfer field, especially with the Technology on Martial Wireless Communication system of cognitive radio Anti-Jamming Technique。
Background technology
General radio communication Anti-Jamming Technique includes three classes: one is that frequency domain processes, such as DSSS, frequency hopping etc.；Two is reason territory, vacancy, such as adaptive antenna etc.；Three is Time Domain Processing, such as burst communication。These Anti-Jamming Techniques are respectively arranged with its advantage, but broadly fall into blind anti-interference mode, namely capacity of resisting disturbance is determined at the beginning of system designs, once enemy disturbs beyond its jamming margin targetedly, then can cause communication disruption, therefore the net electricity Spatial data chains anti-interference problem in complex electromagnetic environment can not be fully solved。
For this, there has been proposed the Anti-jam Communication Technology based on cognitive radio, its ultimate principle is the electromagnetic environment by perception working region, Analysis interference signal characteristic, find frequency spectrum space, and adjustment system operational parameters evades interference real-time dynamicly accordingly, thus reaching reliable communication and improving the purpose of spectrum efficiency。In commercial communication field, cognitive radio is mainly in order to improve the spectrum efficiency of wireless network, and in military communication field, cognitive radio is mainly through the complex electromagnetic environment in perception battlefield, it is estimated, understands and learns, adjust the configuration of communication equipment in real time, to adapt to outside battlefield surroundings change, in order to improve the capacity of resisting disturbance of military channels, solve reliable communications sex chromosome mosaicism under severe Battle Field Electromagnetic。
Communication Anti-Jamming Techniques based on cognitive radio has been benefited our pursuits by some research worker。Li etc. analyze the interference performance based on cognitive interference machine and the capacity of resisting disturbance of cognition wireless network theoretically, see document [1～3]。Document [4] reports a kind of based on the jamproof high frequency radio prototype system of dynamic spectrum。Document [5] analyzes the feasibility of the military communication Anti-interference Strategy based on cognitive radio, has inquired into and has needed key problems-solving。Document [6] describes the jamproof system framework based on cognitive radio and the function of each module of cognitive device。These researchs are all confined to tradition duplex mode of operation, and spectrum efficiency is limited。
Under military combat environment, multiple electronics, communication equipment work simultaneously, cause that electromagnetic spectrum uses at full stretch, frequency spectrum resource wretched insufficiency。For this, there has been proposed many new techniques and new method, including cognitive radio etc., these technology can obtain better effects in spectrum utilization, AF panel etc., but can not solving the intrinsic problem existing for current two-way aerial communication system: the transmission of existing time division duplex (TDD) or FDD (FDD) communicating requirement signal, receiving must be orthogonal in time or frequency dimension, this makes transceiver can not realize real full duplex (FullDuplex) communication with frequency receiving and transmitting signal simultaneously。In theory, uplink and downlink adopt the FDD of different frequency range or time slot transmitting-receiving or TDD system capacity to be only simultaneously with the half of full duplex system in the band of frequency transmitting-receiving。Therefore, full duplex technology is used to be expected to significantly improve the spectrum efficiency of wireless communication system。
General full duplex cognition jam-resistant communication system such as Fig. 1, compared with traditional communication transceiver, receiving terminal adds interference perception unit。At transmitting terminal (TX), message bit stream obtains modulated signal through digital modulation, then with the carrier signal mixing of frequency synthesizer output after be sent to channel through antenna。Owing to have employed full duplex mode of operation, while sending signal, receiving terminal (RX) also begins to work。Wherein, interference perception unit checks frequency channels takies situation and monitoring result is passed to Transmitting and Receiving End, if relatively strong jamming being detected in work at present frequency range, then needs to choose other channels as operating frequency。On the other hand, receive rf chain also the RF signal received to be transformed into base band and be demodulated。
In current full duplex cognition jam-resistant communication system, mostly adopt transmission-reception (T-R) or the full duplex mode of operation of transmission-perception (T-S), respectively as Fig. 2,3。It is first at initial interference perception time slot TS0In, receiver utilizes frequency spectrum perception to carry out Interference Detection, if noiseless or disturb only small in a certain frequency band, then can select it for working band。In the full duplex communication system of T-R pattern, transmitter launches signal in transmission cycle T, and receiver is at whole receiving cycle TRAn interior demodulation process signal, it is impossible to real-time perception is disturbed；And in the full duplex communication system of T-S pattern, transmitter launches signal in transmission cycle T, receiver is at whole receiving cycle TSInside only carrying out Interference Detection, it can detect interference in real time, but can not demodulated received signal, capacity of communication system is equal to semiduplex mode。
Therefore, the function of general transmission-reception or transmission-perception full-duplex communication mode is more single, it is impossible to meet the requirement of the anti-interference in real time and high power system capacity of Technology on Martial Wireless Communication system。Full-duplex mode for transmission-reception can not be anti-interference in real time, and the problem that the full duplex communication system capacity of transmission-perception is low, the present invention proposes a kind of new transmission-perception-reception full duplex antijam communication mode, can be anti-interference in real time, can improve again capacity of communication system。
[1]XLi,JHwu,NFan,“Transmissionpowerandcapacityofsecondaryusersinadynamicspectrumaccessnetwork,”IEEEMilitaryCommunicationsConference,Orlando,FL,Oct.2007:29-31.
[2]WCadeau,XLi,“Anti-jammingperformanceofcognitiveradionetworksundermultipleuncoordinatedjammersinfadingenvironment,”2012the46thAnnualConferenceonInformationSciencesandSystems(CISS'2012),PrincetonUniversity,Mar.2012:21-23.
[3]XLi,WCadeau,“Anti-jammingperformanceofcognitiveradionetworks,”2011the45thAnnualConferenceonInformationSciencesandSystems(CISS'2011),JohnsHopkinsUniversity,Mar.2011:23-25.
[4]YiChaoZhu,PingWang,JianxunLu,“ANewHFRadioPrototypeBasedonDynamicSpectrumAnti-JammingConcept,”20116thInternationalICSTConferenceonCommunicationsandNetworkinginChina(CHINACOM):955-958.
[5] Zhang Zhijian, Guan Jianxin, Zhang Qin, based on the anti-interference research of military communication of cognitive radio, marine electronic engineering, 2009,29 (1): 1-4.
[6] Wei Qi, analyzes based on cognitive radio Anti-Jamming Technique, radio communication technology, 2011,37 (14): 56-58.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of Full-duplex wireless communications method of transmission-perception-reception, anti-interference in real time can improve again power system capacity。
The goal of the invention of the present invention is achieved through the following technical solutions:
A kind of Full-duplex wireless communications method of transmission-perception-reception, comprises the steps of
The first step: in initial interference perception time slot, receiver carries out Interference Detection, if detecting noiseless in a certain frequency band or disturbing relatively low, then this frequency band selected is current transceiver operating frequency；
Second step: transmitter launches signal with operating frequency within the transmission cycle；
3rd step: while launching signal, receiver is divided into K time slot receiving cycle, and according to band interference situation, time slot is dynamically assigned to NtsIndividual perception time slot and NtrIndividual reception time slot；
4th step: receiver detects frequency band internal interference size with selected working band in perception time slot, and utilize the working band known to be demodulated signal processing in reception time slot。
Preferably, described 3rd step dynamically distributes NtsIndividual perception time slot and NtrThe method of individual reception time slot is:
First the 1st time slot of distribution is for receiving time slot, then random assortment perception time slot, receive time slot；
If m-th time slot is perception time slot, and perception present band has interference, then distributing the m+1 time slot is perception time slot, proceed Interference Detection, until detecting noiseless or that interference is very low frequency band, selected new operating frequency, just the next time slot of distribution is for receiving time slot；If this frequency band of perception is noiseless, then can directly distribute next time slot for receiving time slot。
The beneficial effects of the present invention is:
General full duplex transmission-reception (T-R) communication pattern, receiver is at whole receiving cycle TRCan only receive signal can not perception frequency band internal interference situation, transmission-perception (T-S) communication pattern, receiver is at TSPerception interference can only can not receiving signal, and adopt transmission-perception-reception full duplex mode of operation that the present invention proposes, receiving terminal can be assigned as receiving cycle perception/reception time slot t dynamicallys/r, and at perception time slot tsInterior perception frequency band internal interference situation, is receiving time slot trInside it is received signal demodulation process。Therefore, the T-S-R Full-duplex wireless communications that the present invention proposes can realize anti-interference in real time, can improve again capacity of communication system。
Accompanying drawing explanation
Fig. 1 full duplex cognition jamproof system model
Fig. 2 T-R full-duplex mode
Fig. 3 T-S full-duplex mode
The signal transmitting and receiving of Fig. 4 present invention implements step
Fig. 5 T-S-R full-duplex mode
Detailed description of the invention
The enforcement step of the present invention is specifically described below。
Idea of the invention is that: when antijam wireless communication transceiver is started working, transmitter launches signal, receiver dynamically distributes perception time slot simultaneously and receives time slot, and in perception time slot, carry out Interference Detection, signal demodulation process is carried out receiving in time slot, realize with this anti-interference in real time, and improve jam-resistant communication system capacity。Implement step as shown in Figure 4。
First, at initial interference perception time slot TS0In=0.01ms, receiver utilizes frequency spectrum sensing method to carry out Interference Detection in 1～5GHz frequency range, it is assumed that noiseless or interference is very low on frequency band 2.5GHz, then selected its be operating frequency, be set to f=2.5GHz。
Then, in the operating frequency of 2.5GHz, transmitter sends signal in transmission cycle 0.1ms, and receiver is divided into 100 perception/reception time slot (t receiving cycle 0.1mss/r), each time slot 0.1us。
Then, receiver dynamically distributes perception time slot ts, receive time slot trQuantity。Because of at initial perception time slot TS0Selected 2.5GHz is operating frequency, can first distribute the 1st time slot for receiving time slot tr, then dynamically distribute perception/reception time slot。If the 30th time slot is perception time slot ts, and this frequency band of perception has interference, then the 31st time slot of distribution is perception time slot ts, continue in 1～5GHz frequency range, carry out Interference Detection, until detecting noiseless or that interference is very low frequency band, its new operating frequency selected, and the next time slot of distribution is for receiving time slot tr；In like manner, if this frequency range of perception is noiseless, then can directly distribute the 31st time slot for receiving time slot tr。Assume, after time slot distributes, to have 40 perception time slot ts, 60 receive time slot tr。
Finally, receiver is at the perception time slot t of distributionsInside utilize band interference situation in frequency spectrum sensing method detection work at present, if serious interference, then need to adjust current system operating frequency 2.5GHz to disturbing low frequency band, for instance 1.8GHz etc., otherwise still can adopt present operating frequency 2.5GHz。Meanwhile, it is demodulated to received signal processing in reception time slot。
It will be seen that in full duplex cognition jam-resistant communication system, the receiver of T-S communication pattern only detects disturbed condition in whole receiving cycle 0.1ms, not demodulated received signal, if its power system capacity is C；During T-R communication pattern, a demodulated received signal in whole receiving cycle 0.1ms, its power system capacity is 2C, but can not detect interference in real time, and capacity of resisting disturbance is poor。By comparison, the present invention is adopted to propose in the jam-resistant communication system of T-S-R communication pattern, 40 perception time slots are had in receiving cycle 0.1ms, 60 receive time slot, it can utilize 40 perception time slots to realize detecting interference in real time, utilizing 60 to receive time slot demodulation signal, its power system capacity is up to 1.6C simultaneously。Therefore the T-S-R communication technology that the present invention proposes both can be anti-interference in real time, can improve again system message capacity。
It is understood that for those of ordinary skills, it is possible to it is equal to replacement according to technical scheme and inventive concept thereof or is changed, and all these are changed or replace the scope of the claims that all should belong to appended by the present invention。
Claims (2)
1. a Full-duplex wireless communications method for transmission-perception-reception, comprises the steps of
The first step: in initial interference perception time slot, receiver carries out Interference Detection, if detecting noiseless in a certain frequency band or disturbing relatively low, then this frequency band selected is current transceiver operating frequency；
Second step: transmitter launches signal with operating frequency within the transmission cycle；
3rd step: while launching signal, receiver is divided into K time slot receiving cycle, and is dynamically assigned to by time slot according to band interference situationIndividual perception time slot andIndividual reception time slot；
4th step: receiver detects frequency band internal interference size with selected working band in perception time slot, and utilize the working band known to be demodulated signal processing in reception time slot。
2. Full-duplex wireless communications method according to claim 1, it is characterised in that the dynamic distribution in described 3rd stepIndividual perception time slot andThe method of individual reception time slot is:
First the 1st time slot of distribution is for receiving time slot, then random assortment perception time slot, receive time slot；
If m-th time slot is perception time slot, and perception present band has interference, then distributing the m+1 time slot is perception time slot, proceed Interference Detection, until detecting noiseless or that interference is very low frequency band, selected new operating frequency, just the next time slot of distribution is for receiving time slot；If this frequency band of perception is noiseless, then can directly distribute next time slot for receiving time slot。
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Cited By (3)
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| CN107147426A (en) * | 2017-07-21 | 2017-09-08 | 中国人民解放军理工大学 | Anti-interference full-duplex communication device |
| CN108768559A (en) * | 2018-05-22 | 2018-11-06 | 南京邮电大学 | The anti-interference autonomous communication method of intelligent frequency displacement based on electromagnetic environment study |
| CN115333655A (en) * | 2022-10-10 | 2022-11-11 | 华安中云股份有限公司 | Method and device for automatically detecting interference, backpack base station and storage medium |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147426A (en) * | 2017-07-21 | 2017-09-08 | 中国人民解放军理工大学 | Anti-interference full-duplex communication device |
| CN108768559A (en) * | 2018-05-22 | 2018-11-06 | 南京邮电大学 | The anti-interference autonomous communication method of intelligent frequency displacement based on electromagnetic environment study |
| CN108768559B (en) * | 2018-05-22 | 2021-02-05 | 南京邮电大学 | Intelligent frequency shift anti-interference autonomous communication method based on electromagnetic environment learning |
| CN115333655A (en) * | 2022-10-10 | 2022-11-11 | 华安中云股份有限公司 | Method and device for automatically detecting interference, backpack base station and storage medium |
| CN115333655B (en) * | 2022-10-10 | 2024-03-26 | 华安中云股份有限公司 | Method and device for automatically detecting interference, knapsack base station and storage medium |
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