CN105703857B - A kind of Full-duplex wireless communications method of transmission-perception-reception - Google Patents
A kind of Full-duplex wireless communications method of transmission-perception-reception Download PDFInfo
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- CN105703857B CN105703857B CN201610005506.0A CN201610005506A CN105703857B CN 105703857 B CN105703857 B CN 105703857B CN 201610005506 A CN201610005506 A CN 201610005506A CN 105703857 B CN105703857 B CN 105703857B
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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
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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Abstract
The invention discloses a kind of Full-duplex wireless communications methods for sending and perceiving and receiving, and comprise the steps of：The first step：It is perceived in time slot in initial interference, receiver carries out Interference Detection, if detecting, noiseless in a certain frequency band or interference is relatively low, and it is current transceiver working frequency to select the frequency band；Second step：Transmitter emits signal in sending cycle with working frequency；Third walks：While signal is emitted, receiver is divided into K time slot, and be dynamically assigned to time slot according to band interference situation the period is receivedIt is a perception time slot andA reception time slot；4th step：Receiver interferes size in detection frequency band in perception time slot to select working band, and processing is demodulated to signal in reception time slot using the working band known.The present invention can be anti-interference in real time but also improves power system capacity.
Description
Technical field
The invention belongs to wireless information transfer field, especially with the military channel radio of cognitive radio Anti-Jamming Technique
Letter system.
Background technology
General wireless communication Anti-Jamming Technique includes three classes：First, frequency domain is handled, such as Direct Sequence Spread Spectrum, frequency hopping；
Second is that domain, such as adaptive antenna are managed in vacancy；Third, Time Domain Processing, such as burst communication.These Anti-Jamming Techniques respectively have its advantage,
But blind anti-interference mode is belonged to, i.e., antijamming capability determines at the beginning of system designs, and exceeds once enemy targetedly interferes
Its jamming margin, it will cause communication disruption, therefore the net electricity Spatial data chains that cannot be fully solved in complex electromagnetic environment resist it is dry
Disturb problem.
For this purpose, there has been proposed the Anti-jam Communication Technology based on cognitive radio, basic principle is by perceiving work
Make the electromagnetic environment in region, Analysis interference signal characteristic finds frequency spectrum gap, and real-time dynamicly the work of adjustment system is joined accordingly
Number interferes to evade, so as to achieve the purpose that reliable communication and improve spectrum efficiency.In commercial communication field, cognitive radio master
It will be to improve the spectrum efficiency of wireless network, and in military communication field, cognitive radio is mainly by perceiving answering for battlefield
Strays magnetic environment is assessed, understood and is learnt, and adjusts the configuration of communication equipment in real time, is changed with adapting to external battlefield surroundings,
To improve the antijamming capability of military channels, reliable communications sex chromosome mosaicism under severe Battle Field Electromagnetic is solved.
Some researchers benefit our pursuits to the Communication Anti-Jamming Techniques based on cognitive radio.Li et al. is from theory
On analyze the antijamming capability of interference performance and cognition wireless network based on cognitive interference machine, see document [1~3].Document
[4] it reports a kind of based on the jamproof high frequency radio prototype system of dynamic spectrum.Document [5] is analyzed based on cognition wireless
The feasibility of the military communication Anti-interference Strategy of electricity, having inquired into needs key problems-solving.Document [6] is described based on cognition
The function of each module of jamproof system framework and cognitive device of radio.These researchs are confined to traditional diplex operation mould
Formula, spectrum efficiency are limited.
Under military combat environment, a variety of electronics, communication equipment work at the same time, and electromagnetic spectrum are caused to use at full stretch,
Frequency spectrum resource wretched insufficiency.For this purpose, there has been proposed many new technologies and new method, including cognitive radio etc., these technologies
Better effects can be obtained, but current two-way aerial communication system cannot be solved and deposited in spectrum utilization, AF panel etc.
Intrinsic problem：The transmission of existing time division duplex (TDD) or frequency division duplex (FDD) communicating requirement signal, receive must when
Between or frequency dimension it is orthogonal, this prevents transceiver from frequency receiving and transmitting signal realizing real full duplex (Full simultaneously
Duplex it) communicates.Theoretically, the FDD or TDD system capacity that uplink and downlink are received and dispatched using different frequency range or time slot are only same simultaneously
The half of the interior full duplex system of band of frequency transmitting-receiving.Therefore, it is expected to significantly improve the frequency of wireless communication system using full duplex technology
Spectrum efficiency.
General full duplex recognizes jam-resistant communication system such as Fig. 1, and compared with traditional communication transceiver, receiving terminal increases
Interference perceives unit.At transmitting terminal (TX), message bit stream obtains modulated signal by digital modulation, then with frequency synthesizer
After the carrier signal mixing of output channel is sent to through antenna.As a result of full duplex operating mode, the same of signal is being sent
When, receiving terminal (RX) also begins to work.Wherein, interference perceives unit checks frequency channels occupancy situation and transmits monitoring result
To Transmitting and Receiving End, if being detected in work at present frequency range compared with strong jamming, need to choose other channels as working frequency.The opposing party
The RF signals received are also transformed into base band and are demodulated by face, reception rf chain.
In current full duplex cognition jam-resistant communication system, mostly using transmission-reception (T-R) or transmission-perception (T-
S full duplex operating mode), respectively such as Fig. 2,3.Its elder generation perceives time slot T in initial interferenceS0Interior, receiver utilizes frequency spectrum perception
Interference Detection is carried out, if noiseless in a certain frequency band or interference very little, can select it as working band.In the complete of T-R patterns
In duplex communication system, transmitter emits signal in sending cycle T, and receiver is entirely receiving cycle TRInterior demodulation process
Signal, it is impossible to which real-time perception is interfered；And in the full duplex communication system of T-S patterns, transmitter emits letter in sending cycle T
Number, receiver is entirely receiving cycle TSInterior progress Interference Detection, can detect interference in real time, but cannot demodulate reception letter
Number, 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 army
The requirement of the real-time anti-interference and high power system capacity of thing wireless communication system.It cannot be real for the full-duplex mode of transmission-reception
When anti-interference and transmission-perception full duplex communication system capacity it is low the problem of, the present invention proposes a kind of new transmission-sense
Know-receive full duplex antijam communication mode, can be anti-interference in real time and improve capacity of communication system.
[1]X Li,J Hwu,N Fan,“Transmission power and capacity of secondary
users in a dynamic spectrum access network,”IEEE Military Communications
Conference,Orlando,FL,Oct.2007:29-31.
[2]W Cadeau,X Li,“Anti-jamming performance of cognitive radio
networks under multiple uncoordinated jammers in fading environment,”2012 the
46th Annual Conference on Information Sciences and Systems(CISS'2012),
Princeton University,Mar.2012:21-23.
[3]X Li,W Cadeau,“Anti-jamming performance of cognitive radio
networks,”2011 the 45th Annual Conference on Information Sciences and Systems
(CISS'2011),Johns Hopkins University,Mar.2011:23-25.
[4]YiChao Zhu,Ping Wang,Jianxun Lu,“A New HF Radio Prototype Based on
Dynamic Spectrum Anti-Jamming Concept,”2011 6th International ICST Conference
on Communications and Networking in China(CHINACOM):955-958.
[5] Zhang Zhijian, Guan Jianxin, Zhang Qin, the anti-interference research of military communication based on cognitive radio, marine electronic work
Journey, 2009,29 (1)：1-4.
[6] Wei Qi is analyzed, radio communication technology, 2011,37 (14) based on cognitive radio Anti-Jamming Technique：56-
58.
Invention content
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of full duplex radios of transmission-perception-reception
Communication means, can be anti-interference in real time but also improves 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：It is perceived in time slot in initial interference, receiver carries out Interference Detection, if detecting in a certain frequency band without dry
Disturb or interfere it is relatively low, then select the frequency band be current transceiver working frequency；
Second step：Transmitter emits signal in sending cycle with working frequency；
Third walks：While signal is emitted, receiver is divided into K time slot, and according to band interference the period is received
Time slot is dynamically assigned to N by situationtsA perception time slot and NtrA reception time slot；
4th step：Receiver interferes size to select working band in perception time slot in detection frequency band, and utilizes and know
Working band receive time slot in processing is demodulated to signal.
Preferably, the dynamic allocation N in the third steptsA perception time slot and NtrIt is a receive time slot method be：
The 1st time slot is first distributed to receive time slot, is then randomly assigned to perceive time slot, receives time slot；
If m-th of time slot is to perceive time slot, and perception present band has interference, then when distributing the m+1 time slot to perceive
Gap continues Interference Detection, until detecting frequency band noiseless or that interference is very low, selectes new working frequency, just distributes
Next time slot is receives time slot；If it is noiseless to perceive the frequency band, next time slot can be directly distributed to receive time slot.
The beneficial effects of the present invention are：
General full duplex transmission-reception (T-R) communication pattern, receiver are entirely receiving cycle TRSignal can only be received
Disturbed condition in frequency band cannot be perceived, transmission-perception (T-S) communication pattern, receiver is in TSInterference, which can only be perceived, to be received
Signal, and transmission-perception proposed by the present invention-reception full duplex operating mode is used, receiving terminal can be dynamic the period is received
It is assigned as perception/reception time slot ts/r, and perceiving time slot tsDisturbed condition in interior perception frequency band is receiving time slot trInside connect
Collection of letters demodulation process.Therefore, T-S-R Full-duplex wireless communications proposed by the present invention can be realized anti-interference in real time, and can carry
High capacity of communication system.
Description of the drawings
Fig. 1 full duplexs recognize jamproof system model
Fig. 2 T-R full-duplex modes
Fig. 3 T-S full-duplex modes
The signal transmitting and receiving implementation steps of Fig. 4 present invention
Fig. 5 T-S-R full-duplex modes
Specific embodiment
The implementation steps of the present invention are specifically described below.
Idea of the invention is that：When antijam wireless communication transceiver is started to work, transmitter transmitting signal, receiver
It dynamically distributes simultaneously and perceives time slot and receive time slot, and Interference Detection is carried out perceiving in time slot, letter is carried out receiving in time slot
Number demodulation process, is realized anti-interference in real time with this, and improves jam-resistant communication system capacity.Implementation steps are as shown in Figure 4.
First, time slot T is perceived in initial interferenceS0In=0.01ms, receiver utilizes frequency spectrum perception in 1~5GHz frequency ranges
Method carries out Interference Detection, it is assumed that noiseless on frequency band 2.5GHz or interference is very low, then it is working frequency to select it, is set as f=
2.5GHz。
Then, in the working frequency of 2.5GHz, transmitter sends signal in sending cycle 0.1ms, and receiver handle connects
It receives period 0.1ms and is divided into 100 perception/reception time slot (ts/r), each time slot 0.1us.
Then, receiver, which dynamically distributes, perceives time slot ts, receive time slot trQuantity.Because initially perceiving time slot TS0It has selected
2.5GHz is determined for working frequency, can first distribute the 1st time slot to receive time slot tr, then dynamically distribute perception/reception time slot.If
30th time slot is perceives time slot ts, and perceive the frequency band and have interference, then the 31st time slot is distributed to perceive time slot ts, continue 1
Interference Detection is carried out in~5GHz frequency ranges, until detecting noiseless or interfering very low frequency band, its selected new working frequency,
And the next time slot of distribution is receives time slot tr；Similarly, if perceiving, the frequency range is noiseless, and can directly distribute the 31st time slot is
Receive time slot tr.Assuming that after time slot distributes, share 40 and perceive time slot ts, 60 receive time slot tr。
Finally, receiver is in the perception time slot t of distributionsIt is interior to utilize band interference in frequency spectrum sensing method detection work at present
Situation, if serious interference, needing adjustment current system working frequency 2.5GHz, such as 1.8GHz etc. is no to low frequency band is interfered
Present operating frequency 2.5GHz then still can be used.Meanwhile it is demodulated processing receiving the docking collection of letters number in time slot.
It can be seen that in full duplex cognition jam-resistant communication system, the receiver of T-S communication patterns is entirely receiving the period
Disturbed condition is only detected in 0.1ms, not demodulated received signal, if its power system capacity is C；During T-R communication patterns, entirely receiving
Demodulated received signal in period 0.1ms, power system capacity 2C, but interference cannot be detected in real time, antijamming capability is poor.With
Compare, using the present invention propose T-S-R communication patterns jam-resistant communication system in, receive period 0.1ms in have 40 senses
Know time slot, 60 receive time slots, when 40 perception time slots realizations can be utilized to detect interference in real time, while utilizing 60 receptions
Gap demodulated signal, power system capacity is up to 1.6C.Therefore the T-S-R communication technologys proposed by the present invention not only can be anti-interference in real time, but also energy
Enough improve system message capacity.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (1)
1. a kind of Full-duplex wireless communications method of transmission-perception-reception, comprises the steps of：
The first step：Initial interference perceive time slot in, receiver carry out Interference Detection, if detect it is noiseless in a certain frequency band or
Interfere it is relatively low, then select the frequency band be current transceiver working frequency；
Second step：Transmitter emits signal in sending cycle with working frequency；
Third walks：While signal is emitted, receiver is divided into K time slot, and according to band interference situation the period is received
Time slot is dynamically assigned toIt is a perception time slot andA reception time slot, the method for dynamic allocation are：
The 1st time slot is first distributed to receive time slot, is then randomly assigned to perceive time slot, receives time slot；
If m-th of time slot is to perceive time slot, and perception present band has interference, then distributes the m+1 time slot to perceive time slot, after
It is continuous to carry out Interference Detection, until detecting frequency band noiseless or that interference is very low, new working frequency is selected, is just distributed next
Time slot is receives time slot；If it is noiseless to perceive the frequency band, next time slot can be directly distributed to receive time slot；
4th step：Receiver interferes size to select working band in perception time slot in detection frequency band, and utilizes the work known
Make frequency band and processing is demodulated to signal in reception time slot.
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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 |
| 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 |
| 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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| US8666341B2 (en) * | 2010-10-22 | 2014-03-04 | Ultra Electronics Tcs Inc. | Multi-mode communication unit |
| WO2014172160A2 (en) * | 2013-04-16 | 2014-10-23 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | A method for improving spectrum sensing and efficiency in cognitive wireless systems |
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| CN101795459A (en) * | 2010-01-26 | 2010-08-04 | 北京邮电大学 | Wireless communication indoor coverage equipment and interference avoidance/coordination method thereof |
| US8666341B2 (en) * | 2010-10-22 | 2014-03-04 | Ultra Electronics Tcs Inc. | Multi-mode communication unit |
| WO2014172160A2 (en) * | 2013-04-16 | 2014-10-23 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | A method for improving spectrum sensing and efficiency in cognitive wireless systems |
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