CN104393893A - Frequency hopping communication system based on cognitive radio - Google Patents
Frequency hopping communication system based on cognitive radio Download PDFInfo
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Abstract
The invention provides a frequency hopping communication system based on cognitive radio, and the system uses the frequency spectrum dynamic using angle of the cognitive radio for solving the anti-interference problem of traditional frequency hopping communication, uses cognitive radio frequency spectrum sensing technology for dynamically sensing the frequency point with concentrated frequency hopping frequency, keeping away from the frequency point once having interference for some frequency point and avoiding the error code phenomenon caused by frequency point interference, so that the frequency hopping communication system can detect the interference timely and detect the frequency spectrum cavity.
Description
Technical field
The invention belongs to the practical field of communication technology product, particularly relate to a kind of frequency-hopping communication system based on cognitive radio.
Background technology
Spread spectrum communication, be also called spread spectrum communication, in military field, indispensable means of communication is become with the antijamming capability of its uniqueness and wider working band, take Shannon information theory as the modern communications system that main theoretical basis of the reform of Chinese economic structure develops, the base-band signal spectrum of transmission information is expanded on wider frequency band and transmit, treat transmission information by pseudo noise code to modulate, realize spread spectrum; Receiving terminal recycles corresponding technology by after the Spectrum compression expanded, thus reaches the object of information transmission, ensure that simultaneously and reliably communicates.Frequency hopping communications, as one of important kind in spread spectrum communication mode, has stronger anti-interference, anti-fading and Anti TBIgG ability, especially with outstanding anti-single-frequency arrowband interference, and anti-frequency-tracking interference performance and gaining great popularity.Frequency hopping communications refers to that the carrier frequency of receiving-transmitting sides goes control carrier oscillator to produce by pseudo-random code sequence, and carrier wave is changed with the change of pseudo noise code.Observe Frequency Hopping Signal from time domain and frequency domain two aspect, in the time domain, Frequency Hopping Signal is a multicarrier frequency shift keyed signals; In a frequency domain, Frequency Hopping Signal be one on frequency band unequal interval according to the signal of certain rule saltus step.Therefore, as long as enemy does not know the saltus step rule of signal, Content of Communication is just difficult to be intercepted and captured, even if band segment is disturbed by enemy, still can communicate in not disturbed frequency range.Frequency hopping communications has following features compared with traditional communication system:
(1) anti-interference especially anti-arrowband interference performance is strong, insensitive to multi-path jamming;
(2) selectivity addressability is strong, is easy to realize CDMA (code division multiple access) mode and carries out multiple access communication;
(3) spectral density is low, less to the interference of other communication systems, and frequency spectrum resource can be reused;
(4) security performance is good, and information hiding is not easily tracked down.
Therefore, frequency hopping communications has more wide application prospect than traditional communication system in modern radio communication.
In conventional frequency-hopping communication system, the carrier frequency sequence that FH Sequence Generator produces is each frequency that the agreement specified in advance according to communicating pair travels through Hopping frequencies collection.Do not carry out quality analysis to the frequency of frequency set due to during communication, if frequency receives severe jamming, the information of this frequency transmission is difficult to extract, and causes a large amount of error codes, so conventional frequency hopping is also referred to as " blind frequency hopping ".
Summary of the invention
For solving the problem, the invention provides a kind of frequency-hopping communication system based on cognitive radio, this frequency-hopping communication system can detect interference in time, detects frequency spectrum cavity-pocket.
Frequency-hopping communication system based on cognitive radio of the present invention, it comprises transmitter and receiver;
Wherein, transmitter comprises: the first baseband processing unit, the first RF processing unit, the first frequency hopping pattern selected cell and feedback channel receiving element;
Receiver comprises: the second baseband processing unit, the second RF processing unit, the second frequency hopping pattern selected cell, frequency spectrum perception unit and feedback channel transmitter unit;
Annexation between above-mentioned each unit is:
First baseband processing unit is connected with the first RF processing unit, and the first frequency hopping pattern selected cell is connected with feedback channel receiving element, and the first RF processing unit is connected with the first frequency hopping pattern selected cell;
Second baseband processing unit is connected with the second RF processing unit and frequency spectrum perception unit respectively, second RF processing unit is connected with the second frequency hopping pattern selected cell and frequency spectrum perception unit respectively, and frequency spectrum perception unit is connected with feedback channel transmitter unit and the second frequency hopping pattern selected cell respectively;
First RF processing unit is communicated by forward channel with the second RF processing unit; Feedback channel transmitter unit and feedback channel receiving element pass through feedback channel communications;
Wherein, frequency-hopping communication system starts, and carries out work after transmitter and receiver initialization with respective frequency;
First baseband processing unit, for encoding to current information source, framing and modulation treatment, forming baseband modulation signal, and this baseband modulation signal is sent to the first RF processing unit;
First RF processing unit, after baseband modulation signal is carried out amplification and filtering, is moved on the ongoing frequency f of transmitter, forms mixed frequency signal, and this mixed frequency signal is transmitted into described second RF processing unit by forward channel;
Wherein, when after transmitter initialization, first time processes, ongoing frequency f is the initial Hopping frequencies f0 of transmitter, and from second time, ongoing frequency f is the Hopping frequencies that the first frequency hopping pattern selected cell sends;
Second RF processing unit, for being undertaken sending to the second baseband processing unit after solution is jumped by described mixed frequency signal according to the ongoing frequency f ' of receiver;
Wherein, when after receiver initialization, first time processes, the initial Hopping frequencies f0 ' that ongoing frequency f ' is receiver, from second time, ongoing frequency f ' is the Hopping frequencies that the second frequency hopping pattern selected cell sends;
Second baseband processing unit, carries out demodulation for the signal after jumping the second RF processing unit solution, to recover the synchronizing information that transmitter needs, and this synchronizing information is sent to frequency spectrum perception unit;
Frequency spectrum perception unit, for carrying out frequency spectrum perception according to the frequency of described synchronizing information to the two cover frequency hopping patterns prestored in the second frequency hopping pattern selected cell, and sends to the second frequency hopping pattern selected cell and feedback channel transmitter unit respectively by sensing results x;
Feedback channel receiving element, the sensing results x for being transmitted by feedback channel recovers and sends to the first frequency hopping pattern selected cell;
First frequency hopping pattern selected cell, for to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the first RF processing unit, as the ongoing frequency of transmitter;
Second frequency hopping pattern selected cell, for to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the second RF processing unit, as the ongoing frequency of transmitter;
The two cover frequency hopping patterns that first frequency hopping pattern selected cell and the second frequency hopping pattern selected cell prestore are 2 groups of frequency hop sequences having 127 frequencies respectively, and the frequency in the same cycle frequently of two cover frequency hopping patterns keeps duality relation.
Further, described frequency spectrum perception unit comprises:
Clock controller, for when receiving the synchronizing information that the second baseband processing unit sends, the solution controlling the next frequency of current frequency hopping pattern jumps lasting 1/4th hop periods;
Spreading code generator, the solution controlling the next frequency of current frequency hopping pattern according to clock controller is jumped lasting 1/4th hop periods thus produces spreading code;
Digital frequency synthesizer DDS, produces the Hopping frequencies of the down hop of current frequency hopping pattern according to spreading code;
Comparator, carry out Frequency mixing processing for the Hopping frequencies of the down hop by current frequency hopping pattern and present operating frequency, and the energy of frequency after mixing is compared with detection threshold value, if be greater than detection threshold value, then in this frequency hopping pattern there is interference in down hop frequency, otherwise there is not interference;
If the Hopping frequencies of the down hop of current frequency hopping pattern exists interference, then there is not interference in the Hopping frequencies f2 giving tacit consent to the down hop of another set of frequency hopping pattern, the frequency that transmitter and receiver is down hop with Hopping frequencies f2; If the Hopping frequencies of the down hop of current frequency hopping pattern does not exist interference, then do not carry out frequency hopping, transmitter and receiver is still with the frequency that Hopping frequencies f1 is down hop.
Beneficial effect of the present invention is:
This patent to solve the anti-interference problem in traditional frequency hopping communications for the angle that frequency spectrum dynamically utilizes by cognitive radio, by cognitive radio frequency spectrum cognition technology, dynamic sensing is carried out to the frequency that Hopping frequencies is concentrated, once find some frequency has interference just avoid these frequencies in frequency hopping, avoid the error code phenomenon occurring to cause because of frequency interference.
Accompanying drawing explanation
Fig. 1 is the frequency-hopping communication system schematic diagram based on cognitive radio of the present invention;
Fig. 2 is the frequency spectrum perception cell schematics of the frequency-hopping communication system based on cognitive radio of the present invention;
Fig. 3 is the frequency hopping pattern selected cell schematic diagram of the frequency-hopping communication system based on cognitive radio of the present invention.
Embodiment
The fields such as the frequency-hopping communication system based on cognitive radio may be used for a space flight measurement and control, military security communication, realize the combination of cognitive radio and frequency hopping.The antijam communication under complex electromagnetic environment can be realized, belong to practical Creative product.The present invention designs communication, signal transacting, electronics, control etc., belongs to communication technology product practical technique field.
The core concept of cognitive radio makes Wireless Telecom Equipment have discovery " frequency spectrum cavity-pocket " and ability to its Appropriate application exactly.An important prerequisite of cognitive radio is frequency spectrum perception, and the object of frequency spectrum perception finds frequency spectrum cavity-pocket, can not cause harmful interference to primary user simultaneously.To the use of frequency spectrum cavity-pocket, primary user has higher level frequency spectrum access priority than cognitive user.Therefore, cognitive user is carried out in communication process utilizing frequency spectrum cavity-pocket, must quick sensing to the appearance again of primary user, carry out frequency spectrum switching in time, vacate shared frequency range and use to primary user.Cognition wireless electric energy detects interference in time, detects frequency spectrum cavity-pocket.
Frequency-hopping system based on cognitive radio is applied in frequency-hopping system the frequency spectrum perception technology of cognitive radio.Cognition wireless electric unit finds frequency spectrum cavity-pocket, avoids interference in time a little, utilizes the available frequency detected to communicate.By the frequency set of cognitive radio unit controls frequency hopping, reach the object of communication.The thought of this design can improve radio station to the interference between the adaptability of electromagnetic environment, the utilance increasing frequency spectrum resource, minimizing radio station, thus greatly improves the performance of frequency-hopping system.
Based on the frequency-hopping communication system of cognitive radio primarily of transmitter, receiver forms.Wherein, transmitter comprises: the first baseband processing unit, the first RF processing unit, the first frequency hopping pattern selected cell and feedback channel receiving element; Receiver comprises: the second baseband processing unit, the second RF processing unit, the second frequency hopping pattern selected cell, frequency spectrum perception unit and feedback channel transmitter unit.
First frequency hopping pattern selected cell and the second frequency hopping pattern selected cell are identical, FPGA is inner produces the frequency hop sequences that 2 groups have 127 frequencies respectively in advance, thus form two cover frequency hopping patterns, this two covers frequency hopping pattern otherness is large as much as possible, and the Frequency point within the scope of traversal Hopping frequencies collection, be stored in advance in the first frequency hopping pattern selected cell and the second frequency hopping pattern selected cell.First frequency hopping pattern selected cell and the second frequency hopping pattern selected cell select that frequency glitch-free in two cover frequency hopping patterns as the mixing frequencies of down hop according to frequency spectrum perception result, and then control DDS produces corresponding frequency.
At the second RF processing unit receiver according to rule frequency hopping identical with the Frequency Hopping Signal received (but frequency phase-difference intermediate frequency), control frequency synthesizer exports.Be fixed intermediate frequency through mixing, complete to separate and jump; After filtering, carry out if sampling to signal, subsequently, utilize local intermediate frequency carrier to realize digital demodulation at the second baseband processing unit by FPGA at numeric field, the result obtained is carried out decoding again and is recovered raw information.Frequency spectrum perception unit then carries out frequency spectrum perception to the two frequency bins of the down hop of two cover frequency hopping patterns, and sensing results being sent to respectively the second frequency hopping pattern selected cell and feedback channel unit, frequency spectrum perception result is fed back to transmitter by feedback channel by feedback channel unit after ovennodulation.
By cognitive function, system can ensure that frequency hopping communications remains on Frequency point not disturbed in two cover frequency hopping patterns and carry out work.
Wherein:
(1) mainly realize frequency hopping clock calculation in the first baseband processing unit, send message format, the research of the design and implimentation of DPSK baseband modulation and frequency hop sequences.
(2) in the first RF processing unit, mainly baseband signal is passed through amplification and filtering, moved in the frequency of Hopping frequencies collection place, and by information transmitting in forward communication channels.
(3) mainly will come from the frequency spectrum perception demodulates information of receiver and recover in feedback channel receiving element.
(4) first frequency hopping pattern selected cells and the second frequency hopping pattern selected cell are all the frequencies being produced the not disturbed frequency of down hop according to frequency spectrum perception information by channel and pseudo-code converter control DDS.
(5) second baseband processing units are responsible for DPSK base band demodulating; Carrier synchronization and bit synchronization; Frequency-hopping synchronization etc.Recovery transmitter being needed to the information code transmitted is realized by above several step.
(6) frequency spectrum perception unit is the core of whole cognitive frequency hopping communication system, it possesses independently to separate jumps and energy measuring function, complete synchronously at receiver baseband processing unit, carry out solution to the frequency of down hop in advance by clock control frequency spectrum perception unit to jump, judge which frequency hopping pattern is down hop use according to the result of energy measuring.
(7) spectrum information that frequency spectrum perception unit perceives is sent to transmitter by feedback channel by feedback channel transmitter unit.
As shown in Figure 1, the first baseband processing unit is encoded to current information source, framing and modulation treatment, forms baseband modulation signal, and this baseband modulation signal is sent to the first RF processing unit;
First RF processing unit is moved on the ongoing frequency f of transmitter after baseband modulation signal is carried out amplification and filtering, forms mixed frequency signal, and this mixed frequency signal is transmitted into described second RF processing unit by forward channel;
Wherein, when after transmitter initialization, first time processes, ongoing frequency f is the initial Hopping frequencies f0 of transmitter, and from second time, ongoing frequency f is the Hopping frequencies that the first frequency hopping pattern selected cell sends;
Described mixed frequency signal carries out sending to the second baseband processing unit after solution is jumped according to the ongoing frequency f ' of receiver by the second RF processing unit;
Wherein, when after receiver initialization, first time processes, the initial Hopping frequencies f0 ' that ongoing frequency f ' is receiver, from second time, ongoing frequency f ' is the Hopping frequencies that the second frequency hopping pattern selected cell sends;
Second baseband processing unit carries out demodulation to the signal after the second RF processing unit solution jumping, to recover the synchronizing information that transmitter needs, and this synchronizing information is sent to frequency spectrum perception unit;
Frequency spectrum perception unit carries out frequency spectrum perception according to the frequency of described synchronizing information to the two cover frequency hopping patterns prestored in the second frequency hopping pattern selected cell, and sensing results x is sent to respectively the second frequency hopping pattern selected cell and feedback channel transmitter unit;
The sensing results x that feedback channel transmits recovers and sends to the first frequency hopping pattern selected cell by feedback channel receiving element;
First frequency hopping pattern selected cell to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the first RF processing unit, as the ongoing frequency of transmitter;
Second frequency hopping pattern selected cell to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the second RF processing unit, as the ongoing frequency of transmitter;
The two cover frequency hopping patterns that first frequency hopping pattern selected cell and the second frequency hopping pattern selected cell prestore are 2 groups of frequency hop sequences having 127 frequencies respectively, and the frequency in the same cycle frequently of two cover frequency hopping patterns keeps duality relation.
So far, transmitter and receiver all with Hopping frequencies f1 for operating frequency, when after the input of next information source, repeat above-mentioned work, the glitch-free frequency overlapped in frequency hopping pattern according to the selection two of frequency spectrum perception unit determines the operating frequency of transmitter and receiver.
As shown in Figure 2, if there is interference in the frequency in Hopping frequencies collection, the energy of its frequency-region signal on corresponding frequency can be very large, perception unit is then one and jumps with receiver solution the solution differing a hop period and jump system, when receiver receives the information of this hop period now, frequency spectrum perception unit then carries out solution respectively to the two frequency bins of down hop in two frequency hopping patterns and jumps, wherein the solution of the next frequency of frequency hopping pattern 1 is jumped and is continued 1/4th hop periods, the next frequency of frequency hopping pattern 2 continues next 1/4th hop periods, in the next hop periods of two kinds of frequency hopping patterns that frequency spectrum judging then judges to preset according to the result of energy measuring, whether two frequency bins exists interference, if in first set frequency hopping pattern there is not interference in down hop frequency, then frequency spectrum judging sends binary number 00, if the existence of down hop frequency is disturbed in first set pattern, frequency spectrum judging sends binary number 01, if the down hop frequency in the second cover pattern exists disturb, frequency spectrum judging sends binary number 11, if the down hop frequency in the second cover pattern does not exist disturb, frequency spectrum judging sends binary number 10, it passes to the frequency hopping case selector of receiver by FPGA internal data line, thus control DDS generates corresponding frequency, send to transmitter by feedback channel unit simultaneously, make transmitter DDS generate corresponding frequency by transmitter control transmitter frequency hopping pattern selector and carry out mixing, the frequency produced due to transmitter and the DDS of receiver is consistent, the solution that therefore can realize frequency hopping is jumped, thus make in the communication of down hop, Receiver And Transmitter can be operated in same interference-free frequency.
As shown in Figure 3, frequency hop sequences is exactly the pseudo random sequence determining frequency hopping pattern.Frequency hop sequences requires: auto-correlation their cross correlation is good, and minimum distance is large, and the cycle is long.Frequency hop sequences has m sequence usually, GOLD sequence, M sequence, RS sequence etc.M method for generating sequence is comparatively simple, but sequence negligible amounts; GOLD sequence enormous amount, and there are three value cross-correlation functions; M sequence quantity is more, but correlation is poor; RS serial correlation is good, but needs to select.Logical resource spent by comprehensive realization and demand, select to produce comparatively simple m sequence as frequency hop sequences, and realize given gap frequency-hop by antithesis frequency band method.
In the present invention, frequency hop sequences adopts two cycles to be the m sequence (r=7) of 127, drives 2 class frequency words to make DDS generate 2 kinds of different frequency hopping patterns respectively, and the frequency hopping often organizing frequency hopping pattern is counted and is 127.Often organizing frequency hopping pattern all adopts antithesis frequency band method to realize given gap frequency-hop, both 127 frequency hopping frequencies were divided into two groups, low 63 frequencies are as low frequency group, and high 63 frequencies are as high frequency group, when stepped-frequency interval is less than 3 (i.e. 6MHz), jumps to antithesis frequency band and get on.And in order to avoid sequential frequency band disturb cause two cover frequency hopping patterns in down hop frequencies all disturbed, frequency hopping pattern 1 should keep duality relation with the frequency in the same hop period of frequency hopping pattern 2, both in same hop period, if the working frequency points of frequency hopping pattern 1 is in low frequency group, the working frequency points of frequency hopping pattern 2 is in high frequency group.
Frequency spectrum perception information has two kinds in 4 kinds of states at each hop period, the 00 down hop frequency representing frequency hopping pattern 1 can be used, 01 to represent the down hop frequency of frequency hopping pattern 1 unavailable, the 10 down hop frequencies representing frequency hopping pattern 2 can be used, 11 represent that next frequency of frequency hopping pattern 2 is unavailable, control pn code generator by channel-pseudo-code numbering conversion afterwards produce corresponding code thus make DDS produce corresponding frequency, ensure that down hop forward frequency hopping channel is operated on glitch-free frequency.
4 kinds of states of frequency spectrum perception result (next frequency of pattern 1 can with/unavailable, next frequency of pattern 2 can with/unavailable) represent with binary code 00,01,10,11 respectively, modulate frequency spectrum perception result feedback to transmitter through DPSK, the feedback channel unit of transmitter terminal will obtain the state of the down hop frequency of pattern 1 and pattern 2 after the feedback information demodulation received, and then control DDS produces the frequency not having disturbed frequency, thus realize glitch-free frequency hopping communications.
Feedback channel we select away from the frequency range of frequency hopping communications frequency set, thus ensure that feedback channel can not produce interference to normal frequency-hopping communication link, and enemy can be made to be not easy interference feedback channel.Therefore intend adopting 2GHz to be feedback channel carrier frequency, the transmission rate of feedback channel is 40kbps.
The frequency spectrum perception that receiver sends mainly recovers by feedback channel receiving element, the design's preparation 2 kinds of schemes, scheme 1 is conventional mode, and its major function is that the dpsk signal received by feedback channel carries out demodulation, thus obtains the frequency spectrum perception information of receiver end.
Above-mentioned two cover frequency hopping patterns are 2 groups of frequency hop sequences having 127 frequencies respectively, are pre-stored in the second frequency hopping pattern selected cell, the Frequency point within the scope of traversal Hopping frequencies collection, and the frequency in the same cycle frequently of two cover frequency hopping patterns keeps duality relation.
Arrowband is the invention enables surely frequently to disturb for native system complete failure; Sequential frequency band is disturbed native system complete failure; Realize per second 10000 high-speed frequency hopping systems of jumping; Reach 100% to the detection probability of various interference signal, false alarm probability is no more than 1%; Frequency spectrum is no more than 100ms switching time; Hopping frequencies collection scope 500Mhz, frequency hopping frequency 127.Therefore effectively can resist single-frequency point interference, multifrequency point is disturbed, and sequential frequency band disturbs.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (2)
1. based on a frequency-hopping communication system for cognitive radio, it is characterized in that, it comprises transmitter and receiver;
Wherein, transmitter comprises: the first baseband processing unit, the first RF processing unit, the first frequency hopping pattern selected cell and feedback channel receiving element;
Receiver comprises: the second baseband processing unit, the second RF processing unit, the second frequency hopping pattern selected cell, frequency spectrum perception unit and feedback channel transmitter unit;
Annexation between above-mentioned each unit is:
First baseband processing unit is connected with the first RF processing unit, and the first frequency hopping pattern selected cell is connected with feedback channel receiving element, and the first RF processing unit is connected with the first frequency hopping pattern selected cell;
Second baseband processing unit is connected with the second RF processing unit and frequency spectrum perception unit respectively, second RF processing unit is connected with the second frequency hopping pattern selected cell and frequency spectrum perception unit respectively, and frequency spectrum perception unit is connected with feedback channel transmitter unit and the second frequency hopping pattern selected cell respectively;
First RF processing unit is communicated by forward channel with the second RF processing unit; Feedback channel transmitter unit and feedback channel receiving element pass through feedback channel communications;
Wherein, frequency-hopping communication system starts, and carries out work after transmitter and receiver initialization with respective frequency;
First baseband processing unit, for encoding to current information source, framing and modulation treatment, forming baseband modulation signal, and this baseband modulation signal is sent to the first RF processing unit;
First RF processing unit, after baseband modulation signal is carried out amplification and filtering, is moved on the ongoing frequency f of transmitter, forms mixed frequency signal, and this mixed frequency signal is transmitted into described second RF processing unit by forward channel;
Wherein, when after transmitter initialization, first time processes, ongoing frequency f is the initial Hopping frequencies f0 of transmitter, and from second time, ongoing frequency f is the Hopping frequencies that the first frequency hopping pattern selected cell sends;
Second RF processing unit, for being undertaken sending to the second baseband processing unit after solution is jumped by described mixed frequency signal according to the ongoing frequency f ' of receiver;
Wherein, when after receiver initialization, first time processes, the initial Hopping frequencies f0 ' that ongoing frequency f ' is receiver, from second time, ongoing frequency f ' is the Hopping frequencies that the second frequency hopping pattern selected cell sends;
Second baseband processing unit, carries out demodulation for the signal after jumping the second RF processing unit solution, to recover the synchronizing information that transmitter needs, and this synchronizing information is sent to frequency spectrum perception unit;
Frequency spectrum perception unit, for carrying out frequency spectrum perception according to the frequency of described synchronizing information to the two cover frequency hopping patterns prestored in the second frequency hopping pattern selected cell, and sends to the second frequency hopping pattern selected cell and feedback channel transmitter unit respectively by sensing results x;
Feedback channel receiving element, the sensing results x for being transmitted by feedback channel recovers and sends to the first frequency hopping pattern selected cell;
First frequency hopping pattern selected cell, for to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the first RF processing unit, as the ongoing frequency of transmitter;
Second frequency hopping pattern selected cell, for to select in two cover frequency hopping patterns that frequency glitch-free as the Hopping frequencies f1 of down hop according to sensing results x, and described Hopping frequencies f1 is sent to the second RF processing unit, as the ongoing frequency of transmitter;
The two cover frequency hopping patterns that first frequency hopping pattern selected cell and the second frequency hopping pattern selected cell prestore are 2 groups of frequency hop sequences having 127 frequencies respectively, and the frequency in the same cycle frequently of two cover frequency hopping patterns keeps duality relation.
2., as claimed in claim 1 based on the frequency-hopping communication system of cognitive radio, it is characterized in that, described frequency spectrum perception unit comprises:
Clock controller, for when receiving the synchronizing information that the second baseband processing unit sends, the solution controlling the next frequency of current frequency hopping pattern jumps lasting 1/4th hop periods;
Spreading code generator, the solution controlling the next frequency of current frequency hopping pattern according to clock controller is jumped lasting 1/4th hop periods thus produces spreading code;
Digital frequency synthesizer DDS, produces the Hopping frequencies of the down hop of current frequency hopping pattern according to spreading code;
Comparator, carry out Frequency mixing processing for the Hopping frequencies of the down hop by current frequency hopping pattern and present operating frequency, and the energy of frequency after mixing is compared with detection threshold value, if be greater than detection threshold value, then in this frequency hopping pattern there is interference in down hop frequency, otherwise there is not interference;
If the Hopping frequencies of the down hop of current frequency hopping pattern exists interference, then there is not interference in the Hopping frequencies f2 giving tacit consent to the down hop of another set of frequency hopping pattern, the frequency that transmitter and receiver is down hop with Hopping frequencies f2; If the Hopping frequencies of the down hop of current frequency hopping pattern does not exist interference, then do not carry out frequency hopping, transmitter and receiver is still with the frequency that Hopping frequencies f1 is down hop.
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