CN102075943B - Cognitive radio (CR) ultra wideband (UWB) communication system - Google Patents
Cognitive radio (CR) ultra wideband (UWB) communication system Download PDFInfo
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- CN102075943B CN102075943B CN201010275504.6A CN201010275504A CN102075943B CN 102075943 B CN102075943 B CN 102075943B CN 201010275504 A CN201010275504 A CN 201010275504A CN 102075943 B CN102075943 B CN 102075943B
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Abstract
The invention discloses a receiving/sending system structure of a cognitive radio (CR) ultra wideband (UWB) communication system, belongs to the technical field of radio communication, and particularly relates to cognitive radio (CR) communication and impulse radio ultra wideband (IR-UWB) radio communication technology. The main contents of the invention are as follows: the technologies of CR, such as environmental perception, spectrum management, power control and the like, are combinedly applied to the sending system of the IR-UWB communication system, and the technologies, such as environmental perception, spectrum depression and the like, are combinedly applied to the receiving system of the IR-UWB communication system. According to the invention, the intelligence and the anti-jamming ability of the IR-UWB communication system can be improved, and the coexistence of the IR-UWB communication system with other traditional communication systems can be enhanced. The receiving/sending system structure disclosed by the invention is suitable for IR-UWB radio communication of which the electromagnetic environment is complex and multiple communication systems coexist.
Description
One, technical field
The invention belongs to wireless communication technology field, particularly relate to cognitive radio (CR) communication technology and impulse ultra broadband (IR-UWB) wireless communication technology.
Two, background technology
Cognitive radio is a kind of novel intelligent wireless communication technology, it can the environmental characteristic such as frequency, Time and place territory around real-time perception, adopt the internal structure of method to environment, position, radio wave propagation, network, agreement, user and equipment itself building understanding to carry out reasoning, make software radio be transformed into the intelligent agent of radio art from the blindness executor of pre-defined agreement.And carry out intelligent AC by radio knowledge representation language and communication network, real-time adjustment transformation parameter, the change that the wireless rule of system (setting of the radio frequency bandwidth of a series of applicable wireless frequency spectrum reasonable employment, air interface, related protocol and spatiotemporal pattern) and the radio of input encourages adapts, with the high efficiency of the high reliability and frequency spectrum share utilization that reach no matter when and where communication system.
In cognitive radio system, be one of its most basic feature to the perceptual inference of wireless transmission environments, can the utilization power of perception and analysis spectrum, channel status situation and other user state information etc.Residing wireless transmission environments is being carried out on the basis of perception and rational analysis, cognitive radio system carries out optimal selection in idle dimension (frequency, Time and place etc.) to transformation parameter by information interaction, as select use frequency range, signal waveform or modulation system, transmitting power etc., and when environmental change self-adaptative adjustment parameter to improve communication quality.
From discussion above, because cognitive radio has the perception to surrounding environment relevant information, and the various relative transmission parameters adjusting oneself can be gone to reach adaptive communications to conform according to these information.Therefore, cognitive radio technology has the superiority of following two aspects: one, hides interference.As can according to the information that perceives dynamically change transmission channel, forward to and do not have noisy frequency range to go to communicate, to reach jamproof effect; Its two, improve and the compossibility of other system.Because cognitive radio has dynamic spectrum perception and distribution capability, can detect be applicable to communication frequency spectrum communicate, so just can with other coexistence of systems, large interference can not be caused.In addition, also by the method such as transmitting power of adjustment System, to improve transmission range and the quality of system, and the harmful interference to other system can not be increased, to improve the compossibility of system.
Super broad band radio communication is also develop a kind of Novel Communication technology faster.What the present invention relates to is impulse ultra broadband, and its cardinal principle utilizes burst pulse to carry the communication information.IR-UWB modulation signal and the difference of sinusoidal narrow-band modulated are that the carrier of modulation intelligence is different, and IR-UWB is by modulates information on pulse signal, and sinusoidal narrowband systems is then modulated on sinusoidal carrier signal.The notable feature of IR-UWB communication transmits to be submerged under noise aloft, and therefore IR-UWB signal is difficult to be listened, intercept and capture, and IR-UWB signal is very low in time domain duty ratio simultaneously, has the features such as sudden and disguised; In frequency domain, the frequency spectrum of IR-UWB signal is far away wider than other narrow band signal, and this makes IR-UWB signal more difficult disturbed.In addition, the advantages such as it is high that IR-UWB also has multi-path resolved rate, and message transmission rate is fast.IR-UWB has broad application prospects in various fields such as radio communication, radar trackings, accurately location, imaging, weapon control.
But because IR-UWB signal may produce interference to other narrowband systems, and self also may be subject to the interference of other system in some frequency range.Therefore more effectively improving the antijamming capability of ultra-wideband communications and the compossibility with other communication system, is that Ultra-wideband Communication Technology must problems faced.
Therefore, cognitive radio technology and ultra-wideband communication system are combined, learns from other's strong points to offset one's weaknesses, the problem existing for IR-UWB communication system must be made up, make it play larger effect in wireless communications.
At present domestic and international about cognitive radio and super-broadband tech research separately more, but the research both combined is relatively less, particularly utilize the correlation technique of cognitive radio to improve the further investigation optimizing IR-UWB communication system to yet there are no open report.
Three, summary of the invention
The object of the invention is by the part correlation technique of cognitive radio is combined with super broad band radio communication system, form a cognitive radio ultra-wideband communication system, thus effectively improve the antijamming capability of ultra-wideband communication system and the compossibility with other communication system.
The present invention comprises complete IR-UWB transmission system, a receiver system using, and some correlation techniques of cognitive radio, as technology such as environment sensing, spectrum management, power controls.In addition, the present invention additionally uses spectral notch technology to resist arrowband interference in IR-UWB receiver system using.
Environment perception technology in cognitive radio has been applied in IR-UWB communication system by the present invention.The problem such as state information acquisition of the perception to frequency spectrum, channel status estimation, channel information convergence, space interference profile, other user is achieved in environment sensing.This technology can improve the intelligent of IR-UWB communication system, more adequately and reasonably to utilize limited frequency spectrum resource.
Spectrum management techniques in cognitive radio has been applied in IR-UWB communication system by the present invention.These two kinds of new technologies of IR-UWB and cognitive radio communication systems core concept is behind all shared available frequency spectrum resource, but their share spectrum resources and be different from the mode of other coexistence of systems.IR-UWB is the technology of " being lining in bottom ", relies on extremely low power spectral density to realize and traditional ratio coexistence and not interfering with each other; And cognitive radio dependence is frequency spectrum perception and effective dynamic spectrum management method.This technology can improve the compossibility of IR-UWB communication system and other legacy communications system, and initiatively can hide the interference of other system.
Power control techniques in cognitive radio has been applied in IR-UWB communication system by the present invention.Power control techniques can make IR-UWB communication system reduce its own transmission power when spectrum environment is good, thus reduces power consumption, reduces the interference to other communication system, improves the compossibility of IR-UWB.
Spectral notch technology has also been applied in IR-UWB communication system by the present invention.In the receiving end of IR-UWB communication system, first the frequency spectrum perception technology of cognitive radio is utilized, detect between the spectrum region residing for strong narrow band signal, and then adopt spectral notch technology that these narrow band signals are removed, thus reduce its interference to IR-UWB communication system.
Can see from above, the present invention effectively can improve the antijamming capability of ultra-wideband communication system and the compossibility with other communication system.
Four, accompanying drawing explanation
Fig. 1 is cognitive radio ultra broadband transmission system principle sketch
Fig. 2 is cognitive radio ultra broadband receiver system using principle sketch
Five, embodiment
Below in conjunction with accompanying drawing, an explanation is done to embodiments of the present invention.
Fig. 1 gives cognitive radio technology and is applied to and realizes principle sketch in ultra broadband transmission system.
As we can see from the figure, the present invention is combined togather the cognitive radio technology transmission system that to communicate with IR-UWB, constitutes a cognitive radio ultra-wideband communication system.This system has environment sensing function, and perception here had both comprised the perception of transmission system to home environment, also comprises the perception information to local environment that receiver system using is returned by specific channel.In addition, environment sensing of the present invention is dynamic, namely can the change of perception environment at any time, and makes native system can change the messaging parameter of oneself at any time accordingly, thus adapts with surrounding environment.
Transmission system, according to the instant messages perceived, by certain spectrum management algorithm, finds the channel of the most applicable communication, then determines the such as dynamic spectrum such as centre frequency, channel width characteristic parameter.
Spectrum signature due to IR-UWB communication system is mainly determined by shock pulse waveform, therefore can go to select suitable impulse waveform according to above-mentioned channel characteristics parameter.Here the real-time change due to environmental parameter is noted that, above-mentioned spectrum management and impulse waveform selection course etc. are all real-time change, and this and former IR-UWB communication system adopt fixing channel parameter (fixing centre frequency, fixing bandwidth) to be different.Native system has fully demonstrated the feature of cognitive radio, improves the antijamming capability of IR-UWB communication system and the compossibility with other communication system.
After impulse waveform is selected, be the modulation of IR-UWB communication system with that, this process and traditional IR-UWB modulate and distinguish not quite.
After signal madulation completes, native system also will control according to the environmental information rate of doing work perceived, and the transmitting power of namely real-time adjustment oneself, to reduce the interference to other system to greatest extent.
Fig. 2 gives the principle sketch of cognitive radio ultra broadband receiver system using.
In receiving end, first the signal received is carried out filtering, disturb outward with filter out-band.Feature due to IR-UWB is that bandwidth is very wide and power spectrum is very low, and therefore in signal bandwidth after the filtering, the possibility that there is the interference of strong arrowband is larger.So first spectrum analysis will be carried out to signal in receiving end, find the centre frequency residing for strong narrow-band interference signal and bandwidth, then in conjunction with spectral notch technology, this strong narrow-band interference signal is removed.Bandwidth due to strong narrow-band interference signal is very narrow for the bandwidth of IR-UWB signal, the communication quality of the IR-UWB system after therefore adopting spectral notch technology to be removed is distinguished not quite compared with IR-UWB system when not having strong arrowband to disturb, and with there is communication quality compared with the IR-UWB system disturbed strong arrowband and have great raising.
The IR-UWB demodulation method of receiving end of the present invention is substantially identical with traditional IR-UWB demodulation method.
Can see from implementation process above, the present invention is by being attached in IR-UWB communication system by cognitive radio technology, thus IR-UWB system is pushed to higher level intellectuality, make IR-UWB system have perception and study, reasoning and adapt to not expect the ability of environment, add the spectral notch technology of receiving end, the present invention greatly improves the antijamming capability of IR-UWB system and the compossibility with other communication system.
Claims (1)
1. a cognitive radio ultra-wideband communication system, comprises:
An IR-UWB transmission system, for finding according to the instant environmental information comprising transmission system home environment and receiver system using leads to local environment the channel being suitable for communicating; And
An IR-UWB receiver system using;
It is characterized in that, described IR-UWB transmission system comprises:
Environment sensing unit, comprises for perception the instant environmental information that transmission system home environment and receiver system using lead to local environment;
Spectrum management unit, for according to the described instant environmental information comprising transmission system home environment and receiver system using and lead to local environment, determines the dynamic spectrum characteristic parameter comprising centre frequency and channel width;
Impulse waveform selected cell, for according to described dynamic spectrum characteristic parameter selection impulse waveform;
Power control unit, comprises the instant environmental information that transmission system home environment and receiver system using lead to local environment control transmitting power according to described;
Described IR-UWB receiver system using comprises:
Filter unit, for carrying out filtering to received signal, disturbs outward with filter out-band;
Spectral analysis unit, for carrying out spectrum analysis to received signal in signal bandwidth after the filtering, finds strong narrow-band interference signal;
Spectral notch unit, for carrying out spectral notch, to remove described strong narrow-band interference signal to described spectral analysis unit by the strong narrow-band interference signal carrying out spectrum analysis and find.
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| CN201010275504.6A CN102075943B (en) | 2010-09-08 | 2010-09-08 | Cognitive radio (CR) ultra wideband (UWB) communication system |
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| CN104009809B (en) * | 2013-02-27 | 2016-12-28 | 电信科学技术研究院 | A kind of cognitive radio system subframe method of adjustment and equipment |
| CN103780324B (en) * | 2014-03-04 | 2016-08-17 | 南通大学 | Dynamic spectrum access method |
| CN113365279A (en) * | 2015-01-19 | 2021-09-07 | 索尼公司 | Resource management device and method, resource acquisition device and method in communication system |
| US9806836B2 (en) * | 2015-05-13 | 2017-10-31 | Qualcomm Incorporated | Co-existence-aware communication in shared spectrum |
| CN105142133B (en) * | 2015-07-02 | 2018-04-06 | 电子科技大学 | A kind of perception interference countercheck based on HMAC |
| US10396849B1 (en) | 2018-05-15 | 2019-08-27 | Qatar University | Non-coherent ultra-wideband receiver |
| WO2023057317A1 (en) * | 2021-10-04 | 2023-04-13 | Signify Holding B.V. | Monitoring expected electromagnetic interference |
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| US6807405B1 (en) * | 1999-04-28 | 2004-10-19 | Isco International, Inc. | Method and a device for maintaining the performance quality of a code-division multiple access system in the presence of narrow band interference |
| US7386045B2 (en) * | 2004-03-09 | 2008-06-10 | New Jersey Institute Of Technology | Dynamic differentiated link adaptation for ultra-wideband communication system |
| KR100857243B1 (en) * | 2007-03-02 | 2008-09-05 | 인하대학교 산학협력단 | Cognitive uwb system and method for cognitive uwb data communication |
| US8010069B2 (en) * | 2008-04-09 | 2011-08-30 | Mstar Semiconductor, Inc. | Method and apparatus for processing radio signals to identify an active system in a coexisting radio network |
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