CN104320178B - Based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting - Google Patents

Based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting Download PDF

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Publication number
CN104320178B
CN104320178B CN201410554846.XA CN201410554846A CN104320178B CN 104320178 B CN104320178 B CN 104320178B CN 201410554846 A CN201410554846 A CN 201410554846A CN 104320178 B CN104320178 B CN 104320178B
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China
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signal
cognitive radio
emitter
energy
transmission
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CN201410554846.XA
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Chinese (zh)
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CN104320178A (en
Inventor
刘鑫
仲伟志
闫钧华
井庆丰
贾敏
孔繁锵
陈琨奇
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南京航空航天大学
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0006Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/02Selection of wireless resources by user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • H04W72/082Wireless resource allocation where an allocation plan is defined based on quality criteria using the level of interference

Abstract

A kind of energy capture cognitive radio communication means based on synchronous perception and transmission, it is characterised in that frame structure, cognitive radio emitter and cognitive radio receiver including cognitive radio synchronization perception and transmission;The frame structure of cognitive radio is divided into perception frequency band and transmission band on frequency domain, and the synchronous monitoring external electromagnetic environment of cognitive radio is launched and receive information data.Beneficial effects of the present invention are:Cognitive radio can continuously be communicated in whole frame time, and when authorized user is not present, emitter can be significantly improved with larger power transmission signal, the handling capacity of system.

Description

Based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting

Technical field

It is especially a kind of to be recognized based on the synchronous energy capture for perceiving and transmitting the present invention relates to radio communication technology field Know radio communication method.

Background technology

Radio-frequency spectrum is a kind of limited natural resources, is typically licensed to authorized user by government department and uses.In recent years Come, with the growth of radio communication service so that natively rare frequency spectrum resource becomes more nervous.Cognitive radio passes through Dynamic can effectively improve the utilization rate of frequency spectrum resource using the temporary transient untapped idle frequency spectrum of authorized user.In order to avoid The proper communication of authorized user is disturbed, cognitive radio is before using frequency spectrum, it is necessary to be used by the mandate of frequency spectrum perception technology for detection Family whether there is;If authorized user is present, cognitive radio must be stopped or to be interfered less than authorized user Energy be transmitted.The widely used frequency spectrum perception technology of cognitive radio is energy measuring, the extraneous letter that will be perceived Number energy is made comparisons with thresholding set in advance, if energy is more than thresholding, judges that authorized user is present, otherwise judges to authorize use Family is idle.

Energy capture is to utilize the energy (such as mechanical shock, luminous energy, temperature change, electromagnetic field, chemical energy) in environment It is collected and realizes application.In wireless communications, energy capture converts the energy of electromagnetic field being collected into from external environment Into electrical energy for storage into system battery, then it is powered for the various electronic circuits and electronic device of wireless communication system, Ensure the communication quality demand of user.Energy capture is not only able to make full use of the energy resource wasted in environment and its cost Often less than lay the regular maintenance cost needed for the cost or replacing battery of power line, therefore the side powered with the energy of capture Method has great economic well-being of workers and staff.

There is following defect in existing cognition wireless electrical communication technology:

(1) frequency spectrum perception and data transfer of cognitive radio are asynchronous executions, i.e., in detecting period, cognitive radio Data can not be transmitted, due to the reduction of transmission time, cause the communication throughput of system relatively low;

(2) energy of cognitive radio itself is limited, but frequency spectrum perception needs the extra energy of consumption, due to transmission The reduction of energy, causes the communication throughput of system relatively low;

(3) transmission power of cognitive radio is constant, it is impossible to dynamically adjusted according to the existence of authorized user; In the presence of authorized user, reduction power can reduce the interference to authorized user, and when authorized user is idle, improve power meeting Increase the utilization of frequency spectrum.

The content of the invention

The technical problems to be solved by the invention are to significantly improve perceiving based on synchronous for throughput of system there is provided a kind of With the energy capture cognitive radio communication means of transmission.

It is a kind of synchronous based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting, including cognitive radio Frame structure, cognitive radio emitter and the cognitive radio receiver for perceiving and transmitting;The frame structure of cognitive radio is in frequency It is divided into perception frequency band and transmission band on domain, the synchronous monitoring external electromagnetic environment of cognitive radio is launched and receive information Data.

Perceive in frequency band, cognitive radio emitter and cognitive radio receiver are in whole frame time while listening for outer The electromagnetic environment on boundary, emitter receives signal while carrying out frequency spectrum perception and energy capture to external world, and receiver only connects to external world The collection of letters number carries out a frequency spectrum perception.In transmission band, data are launched and received to transmitter and receiver in whole frame time;Work as sense Know in the presence of authorized user, in order to avoid interference authorized user, emitter transmits data, receiver with relatively low initial power Receive transmission signal and directly recover initial data;When perceive authorized user it is idle when, emitter is by the external world captured Signal energy changes into electrical energy for storage into battery, and power amplification unit amplifies transmission power according to battery capacity, makes transmitting Machine is received transmission signal, signal is returned into initial energy level by power scaling with higher power transmission data, receiver Recover not and finally initial data.

The energy capture and transform portion of cognitive radio emitter are by frequency mixer, local oscillator, matched filter, band Bandpass filter, rectification circuit and low pass filter composition;Frequency mixer, matched filter, bandpass filter, rectification circuit, low pass Wave filter is sequentially connected, and frequency mixer is also associated with local oscillator, receives the oscillator signal that local oscillator is produced.

The job step of cognitive radio emitter is as follows:

(1) channel width is divided into perception frequency band and transmission band by emitter by bandwidth allocation element, and passes through duplex Its line locking performs the transmitting for perceiving signal of communication in the monitoring of extraneous electromagnetic environment and transmission band in frequency band;

(2) perceiving in frequency band, emitter is received and outer signals of sampling, and docking the collection of letters number while carrying out energy capture And frequency spectrum perception, energy of the energy capture for collecting reception signal, frequency spectrum perception in judgement reception signal for whether there is Authorization user signal;

(3) information data is converted into the signal of suitable transmission by data processing unit, including information coding and Signal modulation process;

(4) judge that authorized user is present by frequency spectrum perception, in transmission band, in order to avoid interference authorized user, hair Machine is penetrated with relatively low initial power by antenna transmitted data signal, otherwise performs step (5);

(5) judge that authorized user is idle by frequency spectrum perception, emitter converts the outer signals that will be captured by energy Energy changes into the electric energy of system itself needs, and by the way that power storage is got up to battery charging;Power amplification unit according to The energy that battery is provided amplifies the transmission power of emitter, and passes through antenna transmitted data signal with higher power.

The energy capture of cognitive radio emitter and the job step of transform portion are as follows:

(1) the local oscillator signal for producing the local oscillator of the high frequency ac signal received and emitter passes through mixed Frequency device produces the accessible midfrequent AC signal of rectification circuit.

(2) midfrequent AC signal filters out the interference noise in external electromagnetic environment by matched filter.

(3) by the output signal of matched filter by bandpass filter be tuned to the accessible frequency model of rectification circuit Enclose.

(4) midfrequent AC signal is changed into direct current signal by rectification circuit.

(5) d. c. voltage signal is obtained after direct current signal being filtered out into fundamental wave harmonic signal by low pass filter.

The job step of cognitive radio receiver is as follows:

(1) channel is divided into perception frequency band and transmission band by receiver by bandwidth allocation element, and passes through duplexed antenna Synchronous perform perceives the monitoring of extraneous electromagnetic environment and the interior reception to emitter transmission signal of transmission band in frequency band;

(2) perceiving in frequency band, receiver, which receives and sampled, outer signals and carries out frequency spectrum perception, judges to receive in signal With the presence or absence of authorization user signal;

(3) judge that authorized user is present by frequency spectrum perception, in transmission band, receiver believes the emitter received Number being sent directly into data recovery unit recovers initial data, otherwise performs step (4);

(4) judge that authorized user is idle by frequency spectrum perception, in transmission band, receiver believes the emitter received Number initial energy rank is returned to by power scaling, signal feeding data recovery unit is then recovered into initial data.

Beneficial effects of the present invention are:Cognitive radio can continuously be communicated in whole frame time, and When authorized user is not present, emitter can be significantly improved with larger power transmission signal, the handling capacity of system.

Brief description of the drawings

Fig. 1 is the structure chart of the frame structure of cognitive radio synchronization perception and the transmission of the present invention.

Fig. 2 is the structure chart of the cognitive radio emitter of the present invention.

Fig. 3 is the energy capture of the cognitive radio emitter of the present invention and the structure chart of conversion.

Fig. 4 is the structure chart of the cognitive radio receiver of the present invention.

Embodiment

As shown in figure 1, the frame structure of cognitive radio is divided into perception frequency band and transmission band, cognition wireless on frequency domain The transmitter and receiver of electricity is perceiving frequency band and the inter-sync monitoring external electromagnetic environment of transmission band and transmitting/receive information Data.Perceive in frequency band, the transmitter and receiver of cognitive radio is in whole frame time while listening for extraneous electromagnetism ring Border, emitter receives outer signals, and carries out frequency spectrum perception and energy capture simultaneously, and receiver only receives signal and carried out to external world Frequency spectrum perception;In transmission band, data are launched and received to transmitter and receiver in whole frame time.Used when perceiving to authorize In the presence of family, in order to avoid interference authorized user, emitter transmits data with relatively low initial power in transmission band, receives The signal of machine receiver/transmitter transmitting simultaneously directly recovers initial data;When perceive authorized user it is idle when, emitter will be caught Electric energy that all outer signals energy received are changed into needed for system is simultaneously stored into battery, and power amplification unit is according to battery The energy of offer amplifies the transmission power of emitter, emitter is transmitted data in transmission band with higher power, receives The signal of machine receiver/transmitter transmitting, initial energy rank is returned to by power scaling unit by transmission signal, and final extensive Appear again initial data.

As shown in Fig. 2 the job step of cognitive radio emitter is as follows:

(1) channel width is divided into perception frequency band and transmission band, the principle of distribution by emitter by bandwidth allocation element Meet:

Wherein, QoS is the service quality of wireless communication system;Emitter is synchronously performed by duplexed antenna and perceived in frequency band Signal of communication in the monitoring (including noise, authorization user signal and channel fading characteristic etc.) of external electromagnetic environment and transmission band Transmitting.

(2) perceiving in frequency band, emitter is received and outer signals of sampling, sample frequency is reception outer signals most high frequency 2 times of rate, the signal after sampling is expressed as:Y (1), y (2) ..., y (M), M is sampling number.The docking collection of letters number carries out energy and caught simultaneously Obtain and frequency spectrum perception.Energy capture is used to collect the energy for receiving signal, the signal energy E of captureHIt is expressed as

Frequency spectrum perception is used to judge to receive to whether there is authorization user signal in signal, i.e.,:The ENERGY E of signal will be receivedH It is compared with the thresholding λ of setting, if EH>=λ, judges that authorized user is present, if EH< λ, judge that authorized user is idle;Door Limit λ setting is expressed as λ=(Ps,min+PN) T, wherein Ps,minFor the minimum emissive power of authorized user, PNFor noise power, T For the duration of frame.

(3) information data is converted into the data-signal of suitable transmission by data processing unit, including information is compiled Code and signal modulation process;

(4) judge that authorized user is present by frequency spectrum perception, in transmission band, in order to avoid interference authorized user, hair Penetrate machine and antenna transmitted data signal, relatively low transmission power P are passed through with relatively low initial powerLIt is expressed asEIIt is to award The maximum interference energy that the cognitive radio that weighing user allows is produced;Otherwise perform step 5.

(5) judge that authorized user is idle by frequency spectrum perception, emitter converts all external worlds that will be captured by energy The electric energy that signal energy is changed into required for system itself, and by the way that power storage is got up to battery charging;Power amplification list The energy that member is provided according to battery amplifies the transmission power of emitter, and passes through antenna transmitted data signal with higher power; Higher transmission power PUIt is expressed as with the amplification coefficient η of power amplifierIts In 0 < ξ < 1 be energy transformation ratio, according to the characteristic of energy conversion circuit device determine.

As shown in figure 3, the energy capture of cognitive radio emitter and the job step of transform portion are as follows:

(1) the local oscillator signal for producing the local oscillator of the high frequency ac signal received and emitter passes through mixed Frequency device produces the accessible midfrequent AC signal of rectification circuit.

(2) midfrequent AC signal filters out the interference noise in external electromagnetic environment by matched filter.

(3) by the output signal of matched filter by bandpass filter be tuned to the accessible frequency model of rectification circuit Enclose.

(4) midfrequent AC signal is changed into direct current signal by rectification circuit.

(5) direct current signal is filtered out into fundamental wave harmonic signal by low pass filter and obtains d. c. voltage signal.

As shown in figure 4, the job step of cognitive radio receiver is as follows:

(1) channel width is divided into perception frequency band and transmission band, the principle of distribution by receiver by bandwidth allocation element Meet:

Synchronously performed by duplexed antenna and perceive the monitoring of extraneous electromagnetic environment in frequency band (including noise, authorized user are believed Number and channel fading characteristic etc.) and the interior reception to emitter transmission signal of transmission band.

(2) perceiving in frequency band, receiver, which is received, and sampling is extraneous receives signal and carry out frequency spectrum perception;Frequency spectrum perception is led to Cross the extraneous ENERGY E for receiving signalHIt is compared with the thresholding λ of setting, judges to receive in signal with the presence or absence of authorized user Signal, i.e.,:If EH>=λ, judges that authorized user is present, and otherwise judges that authorized user is idle.

(3) judge that authorized user is present by frequency spectrum perception, in transmission band, receiver believes the emitter received Number being sent directly into data recovery unit recovers initial data, including signal demodulation information decoding process, otherwise performs step (4)。

(4) judge that authorized user is idle by frequency spectrum perception, in transmission band, receiver believes the emitter received Number initial energy rank is returned to by power scaling, power scaling coefficient θ is expressed asThen signal is sent into number Initial data, including signal demodulation information decoding process are recovered according to recovery unit.

Although the present invention is illustrated and described with regard to preferred embodiment, it is understood by those skilled in the art that Without departing from scope defined by the claims of the present invention, variations and modifications can be carried out to the present invention.

Claims (3)

1. it is a kind of based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting, it is characterised in that including cognition Frame structure, cognitive radio emitter and cognitive radio receiver that radio synchronization is perceived and transmitted;Cognitive radio Frame structure is divided into perception frequency band and transmission band, the synchronous monitoring external electromagnetic environment of cognitive radio, transmitting on frequency domain And receive information data;
The job step of cognitive radio emitter is as follows:
(1) channel width is divided into perception frequency band and transmission band by emitter by bandwidth allocation element, and passes through duplexed antenna It is synchronous to perform the transmitting for perceiving signal of communication in the monitoring of extraneous electromagnetic environment and transmission band in frequency band;
(2) perceiving in frequency band, emitter is received and outer signals of sampling, and docking the collection of letters number while carrying out energy capture and frequency Spectrum is perceived, and energy capture is used for the energy for collecting reception signal, and frequency spectrum perception is used to judge to receive in signal with the presence or absence of mandate Subscriber signal;
(3) information data is converted into the signal of suitable transmission, including information coding and signal by data processing unit Modulated process;
(4) judge that authorized user is present by frequency spectrum perception, in transmission band, in order to avoid interference authorized user, emitter With relatively low initial power by antenna transmitted data signal, otherwise perform step (5);
(5) judge that authorized user is idle by frequency spectrum perception, emitter converts the outer signals energy that will be captured by energy The electric energy of system itself needs is changed into, and by the way that power storage is got up to battery charging;Power amplification unit is according to battery The energy of offer amplifies the transmission power of emitter, and passes through antenna transmitted data signal with higher power.
2. communication means as claimed in claim 1, it is characterised in that the energy capture and conversion portion of cognitive radio emitter Divide and be made up of frequency mixer, local oscillator, matched filter, bandpass filter, rectification circuit and low pass filter;Frequency mixer, Matched filter, bandpass filter, rectification circuit, low pass filter are sequentially connected, and frequency mixer is also associated with local oscillator, are connect Receive the oscillator signal that local oscillator is produced.
3. communication means as claimed in claim 1, it is characterised in that the job step of cognitive radio receiver is as follows:
(1) channel is divided into perception frequency band and transmission band by receiver by bandwidth allocation element, and synchronous by duplexed antenna Perform the reception for perceiving emitter transmission signal in the monitoring of extraneous electromagnetic environment and transmission band in frequency band;
(2) perceiving in frequency band, receiver, which is received and sampled, outer signals and carries out frequency spectrum perception, judge in reception signal whether There is authorization user signal;
(3) judge that authorized user is present by frequency spectrum perception, in transmission band, receiver is by the signal of the emitter received It is sent directly into data recovery unit and recovers initial data, otherwise performs step (4);
(4) judge that authorized user is idle by frequency spectrum perception, in transmission band, receiver is by the signal of the emitter received Initial energy rank is returned to by power scaling, signal feeding data recovery unit is then recovered into initial data.
CN201410554846.XA 2014-10-17 2014-10-17 Based on the synchronous energy capture cognitive radio communication means for perceiving and transmitting CN104320178B (en)

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CN106412927B (en) * 2016-09-19 2019-06-21 西安电子科技大学 Cooperative transmission collection of energy cognitive radio networks optimal resource allocation method

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CN101536573A (en) * 2006-07-28 2009-09-16 Lg电子株式会社 Apparatus and method for dynamically allocating radio resource
CN101807959A (en) * 2010-03-25 2010-08-18 电子科技大学 Interference suppression method used for cognitive wireless system
CN103002449A (en) * 2012-11-29 2013-03-27 广州市香港科大霍英东研究院 Cognitive radio collaborative awareness and frequency spectrum competing method based on frequency domain

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US7869400B2 (en) * 2006-10-16 2011-01-11 Stmicroelectronics, Inc. Method of inter-system coexistence and spectrum sharing for dynamic spectrum access networks-on-demand spectrum contention

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Publication number Priority date Publication date Assignee Title
CN101536573A (en) * 2006-07-28 2009-09-16 Lg电子株式会社 Apparatus and method for dynamically allocating radio resource
CN101807959A (en) * 2010-03-25 2010-08-18 电子科技大学 Interference suppression method used for cognitive wireless system
CN103002449A (en) * 2012-11-29 2013-03-27 广州市香港科大霍英东研究院 Cognitive radio collaborative awareness and frequency spectrum competing method based on frequency domain

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