CN101252566B - Method and apparatus for generating and receiving frequency domain direct enlarging - fractional number field frequency-hopping mixing signal - Google Patents
Method and apparatus for generating and receiving frequency domain direct enlarging - fractional number field frequency-hopping mixing signal Download PDFInfo
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Abstract
Disclosed are frequency domain direct spread and fractional Fourier domain hopping signal generation and receiving methods and the device thereof, avoiding the defects in current frequency domain direct sequence spreading and fractional Fourier domain frequency hopping. The signal generation method includes the steps: two branches of binary numerical signals are acquired from a information source; direct sequence spectrum spreading is carried out to the first branch of signals so as to obtain direct sequence spread spectrum signals; frequency hopping is carried out to the second branch of signals so as to obtain fractional Fourier domain frequency hopping signals; the two branches of signals are added to each other, thus getting composite spread spectrum outputting signals. The signal receiving method includes the steps: the received signals are de-hopped so as to get de-hopped signals; then the received signals sequentially undergo p-Fourier transform, peak value deprivation, fractional 2-2p-Fourier transform, peak value deprivation again, fractional p-2-Fourier transform, de-spreading and demodulation, thus getting de-spread signals; the de-spread signals and the de-hopped signals undergo parallel-to-serial conversion so as to get the original user signals. The signal generation and receiving methods and the device combine two spread spectrum techniques and increase the concealment of the system.
Description
Technical field
The present invention relates to the mixing spread spectrum technique in a kind of radio communication, be specifically related to a kind of frequency domain direct sequence-generation of fractional number field frequency-hopping mixing spread spectrum signal, the method and the device of reception.
Background technology
DSSS and frequency hopping are two kinds of common in spread spectrum communication system communication modes.These two kinds of basic spread spectrum communication systems respectively have pluses and minuses, and the advantage of directly-enlarging system is that signal good concealment, antijamming capability are strong, is fit to the wideband digital system, and shortcoming is that near-far interference is serious, can not set up with narrowband systems and communicate by letter; Good, the no obvious near-far interference of frequency-hopping system anti-multipath performance is fit to instantaneous narrowband systems, and shortcoming is that limited, the fast frequency-hopped device of disguised poor, the anti-multifrequency interference performance of signal is limited.Sometimes being difficult to satisfy system requirements when use is wherein a kind of separately, is that complementary spread spectrum technique combines with these two kinds of pluses and minuses, promptly constitutes to have more a kind of spread spectrum system of premium properties.Direct sequence/frequency hopping that Here it is (DS/FH) spread spectrum system.
Sender end in the Direct swquence spread spectrum system, data-signal waiting for transmission and pseudo noise code (spreading code) waveform multiply each other (or with 2 draws of pseudo-random code sequence mould), and the compound key of formation is modulated carrier wave, is launched by antenna then.At the receiver end, produce one with sender in the synchronous local pseudo noise code of pseudo noise code, carry out despreading to received signal, the signal after the despreading is delivered to the demodulator demodulation, recovers the signal of transmission.
Frequency-hopping system is the output frequency that removes to control the radio-frequency carrier oscillator with the binary system pseudo-random code sequence discretely, makes the frequency saltus step with the variation of pseudo noise code that transmits.Pseudo-random hop sequence control frequency hopper; Make its output frequency saltus step in very wide frequency band range; Claim frequency hopping pattern again, receiving terminal will produce a local pseudo random sequence synchronous with the transmitting terminal pseudo noise code, separates jumping to the received signal with pseudo random sequence control carrier oscillator.
Fractional Fourier transform (FRFT) is can be applied in the algorithm of spread-spectrum, and said fractional Fourier transform is a kind of Fourier transform of broad sense, and the expression of signal on fractional order Fourier domain comprised the signal of signal at time domain and frequency domain simultaneously.The integrated form of fractional Fourier transform is defined as:
Wherein f (t) is the time domain expression-form of signal, and the p rank fractional Fourier transform of f (t) is F
pF (u), wherein u is the score field coordinate, α=p pi/2.F (u) is common Fourier transform when α=pi/2.Because fractional Fourier transform (FRFT) is the expansion of signal on the general signal of cutting of one group of quadrature (chirp) base, so fractional Fourier transform has best energy accumulating characteristic to the given general signal (chirp) of cutting in certain fractional order Fourier domain.Promptly cut general signal (chirp) and in suitable fraction Fourier conversion territory, will show as an impulse function for one; And for Fourier transform; Because basic function is sinusoidal wave, in traditional Fourier transform, can produce power not assemble so cut general signal.The expression formula of wherein, cutting general signal is:
Parameter
f
0, k representes to cut phase place, centre frequency and the frequency change rate of general signal respectively.The relation of k and bandwidth B is B=kT, and wherein T is for cutting general signal time domain width.In practical communication system, the signal of transmitting terminal emission is a real function, gets two conjugation and cuts general signal stack, makes it become the cosine function form, and expression formula is following:
c(t)＝{exp[i(2πf
0t+πkt
2)]+exp[-i(2πf
0t+πkt
2)]}/2
＝cos(2πf
0t+πkt
2)。
Summary of the invention
The invention solves the shortcoming that existing frequency domain DSSS and this dual mode of fractional number field frequency-hopping exist; A kind of method and signal receiving/transmission device of new mixing spread spectrum signal are provided, i.e. the generation of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal and method of reseptance and device.
The production method of the frequency domain direct enlarging-fractional number field frequency-hopping mixing signal among the present invention is:
The step that signal generates: information source produces sends signal c (t), and said transmission signal c (t) is obtained the two-way binary digital signal through serial/parallel conversion, and said two-way binary digital signal is respectively the first via and sends signal c
1(t) and the second the tunnel send signal c
2(t);
The first via is sent signal c
1(t) carry out the step of DSSS: multiplying each other through the direct sequence that produces with the direct sequence generator obtains direct sequence signal c '
1(t), again to said direct sequence signal c '
1(t) carry out binary phase shift keying (BPSK) and then acquisition direct sequence signal s
1(t);
Send signal c to the second the tunnel
2(t) carry out the step of frequency hopping: FH Sequence Generator produces frequency hop sequences; Sequential value by said frequency hop sequences produces frequency hopping pattern; Output in real time has the general signal of cutting of different parameters k according to said frequency hopping pattern to cut general signal generator, and with receive the second the tunnel send signal c
2(t) carry out mixing and obtain fractional number field frequency-hopping signal s
2(t);
The step that mixing and signal send: with the direct sequence signal s that obtains in the above-mentioned steps
1(t) and fractional number field frequency-hopping signal s
2(t) addition obtains mixed spread spectrum transmission signal s (t), and said mixed spread spectrum transmission signal s (t) launches through the transmitting terminal antenna;
Parameter k representes to cut the frequency change rate of general signal, and the relation of k and bandwidth B is B=kT, and wherein T is for cutting general signal time domain width.
The method of reseptance of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal of the present invention is:
The step that signal receives: by forming received signal after reception antenna received signal and the filtering;
It is rapid to separate leapfrog: the FH Sequence Generator of receiving terminal produces and the frequency hop sequences that receives signal Synchronization, and the fractional Fourier transform device p rank fractional Fourier transform that under the control of said frequency hop sequences, disperses to received signal obtains p rank fourier-transformed signal r
p(u), the peak decision device is judged said p rank fourier-transformed signal r on the fractional number Fourier field of p rank
p(u) waveform peak position, and then obtain to separate jumper connection collection of letters r
2(u);
Despreading step: in receiving signal, deduct and separate jumper connection collection of letters r
2(u) obtain despread signal r
1(u), detailed process does, to the p rank fourier-transformed signal r that in separating leapfrog suddenly, obtains
p(u) the score field elimination peak value part signal on the p rank; Then to the signal 2-2p rank fractional Fourier transform that disperses; And to the signal after the conversion on the 2-2p rank score field elimination peak value part signal; Afterwards again to the signal p-2 rank fractional Fourier transform that disperses, obtain removing and separate jumper connection collection of letters r in time domain
2(u) the reception signal r after
1' (u), produce and the direct sequence that receives signal Synchronization with receiving terminal direct sequence generator then, jumper connection collection of letters r is separated in removal
2(u) the reception signal r after
1' (u) carry out despreading, at last the signal after the despreading is carried out demodulation and acquire despread signal r
1(u);
Signal blend step: with the despread signal r that obtains in the above-mentioned steps
1(u) conciliate jumping signal r
2(u) acquire the subscriber signal of original transmission through parallel/serial conversion.
Separate leapfrog rapid in, p value changes with the change of the sequential value of frequency hop sequences, when frequency hop sequences value change one time, the saltus step of p value once, the p value is corresponding one by one with the k value of transmitting terminal.
In separating leapfrog suddenly, the peak decision device is judged said p rank fourier-transformed signal r
pThe detailed process of waveform peak position (u) is: output 1 when peak appears at preceding half section of score field energy spectrum, output 0 when peak appears at the second half section of score field energy spectrum.
Basic thought of the present invention is when cutting general signal | when k| gets different value, best energy accumulating characteristic is arranged on corresponding different score field.The user is divided into two tunnel modulation at transmitting terminal with signal, and this two road signal of transmission reaches resource multiplex and strengthens concealed purpose in same frequency range then.
The generation device of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal of the present invention comprises information source 11, serial/parallel transducer 12, DSSS device 13, spread spectrum modulator 15, cut general signal generator 18, FH Sequence Generator 19, first filter 17 and adder 20; The signal output part of information source 11 is connected with the signal input part of serial/parallel transducer 12; Two signal output parts of said serial/parallel transducer 12 are connected with the signal input part of DSSS device 13, the signal input part of cutting general signal generator 18 respectively; The signal output part of said DSSS device 13 is connected with the signal input part of spread spectrum modulator 15; The signal output part of said spread spectrum modulator 15 is connected with the signal input part of first filter 17; The Frequency Hopping Signal input of the signal output part of FH Sequence Generator 19 and Qie Pu signal generator 18 is connected; Saidly cut the signal output part of general signal generator 18, the signal output part of first filter 17 is connected with two signal input parts of adder 20 respectively, the signal output part of said adder 20 is exported armed output signal; Output in real time has the general signal of cutting of different parameters k according to frequency hopping pattern to cut general signal generator 18, and with receive the second the tunnel send signal c
2(t) carry out mixing and obtain fractional number field frequency-hopping signal s
2(t), said frequency hopping pattern is that the sequential value of the frequency hop sequences that produced by FH Sequence Generator produces, and parameter k representes to cut the frequency change rate of general signal, and the relation of k and bandwidth B is B=kT; Wherein T is for cutting general signal time domain width.
Comprise second filter 32, P rank fractional Fourier transform device 33, FH Sequence Generator 34, the first fractional fourier transform domain filter 35,2-2P rank fractional Fourier transform device 36, the second fractional fourier transform domain filter 37, P-2 rank fractional Fourier transform device 38, despreader 39, extended frequency demodulator 41, the 3rd filter 43, peak value decision device 44 and parallel/serial transducer 45 in the receiving system of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal of the present invention; A signal input part of the signal output part of second filter 32 and P rank fractional Fourier transform device 33 is connected; The Frequency Hopping Signal input of said P rank fractional Fourier transform device 33 and the signal output part of FH Sequence Generator 34 are connected; The signal output part of said P rank fractional Fourier transform device 33 is connected with the signal input part of peak value decision device 44, the signal input part of the first fractional fourier transform domain filter 35 respectively; The signal output part of the said first fractional fourier transform domain filter 35 is connected with the signal input part of 2-2P rank fractional Fourier transform device 36; The signal output part of said 2-2P rank fractional Fourier transform device 36 and the signal input part of the second fractional fourier transform domain filter 37 are connected; The signal output part of the said second fractional fourier transform domain filter 37 is connected with the signal input part of P-2 rank fractional Fourier transform device 38; The signal output part of said P-2 rank fractional Fourier transform device 38 and the signal input part of despreader 39 are connected; The signal output part of said despreader 39 is connected with the signal input part of extended frequency demodulator 41; The signal output part of said extended frequency demodulator 41 is connected with the signal input part of the 3rd filter 43; The signal output part of the signal output part of said the 3rd filter 43, peak value decision device 44 is connected with two signal input parts of parallel/serial transducer 45 respectively, the output output primary signal of said parallel/serial transducer 45;
The fractional Fourier transform device 33 p rank fractional Fourier transform that under the control of said frequency hop sequences, disperses to received signal in P rank obtains p rank fourier-transformed signal r
p(u);
Peak value decision device 44 is judged said p rank fourier-transformed signal r on the fractional number Fourier field of p rank
p(u) waveform peak position, and then obtain to separate jumper connection collection of letters r
2(u);
The first fractional fourier transform domain filter, 35 pairs of p rank fourier-transformed signal r
p(u) the score field elimination peak value part signal on the p rank;
The signal of 37 pairs of input inputs of the second fractional fourier transform domain filter is score field elimination peak value part signal on the 2-2p rank;
Despreader 39 utilizes receiving terminal direct sequence generator to produce and the direct sequence that receives signal Synchronization, and jumper connection collection of letters r is separated in removal
2(u) the reception signal r after
1' (u) carry out despreading.
Beneficial effect of the present invention has:
One, utilizing different parameters | k| cuts general signal has best energy accumulating on corresponding not same order score field character; In conjunction with direct sequence and two kinds of spectrum spreading methods of frequency hopping, these two kinds spread spectrums excellent, that shortcoming is complementary of frequency domain DSSS and fractional number field frequency-hopping are combined.Two, carry out the fractional Fourier transform of corresponding exponent number and then obtain energy accumulating according to correct frequency hopping pattern at receiving terminal, separate with the peak value judgement then and jump out correct signal.Three, the method that adopts Direct-Spread and fractional number field frequency-hopping to combine has realized channel multiplexing, promptly in identical frequency band with two kinds of modulation systems while transmitting two paths of signals.Four, two kinds of spread spectrums combine, and it is disguised to have strengthened system.
Description of drawings
Fig. 1 is the generation of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal of the present invention and the structural representation of receiving system; Fig. 2 is the waveform sketch map that carries out direct spread-spectrum; D (t) c (t) is the waveform after expanding; The spread-spectrum signal of s (t) expression signal transmitting terminal output,
Fig. 3 are to cut the waveform of the mixed spread-spectrum signal of general signal and direct sequence signal stack in time domain.Fig. 4 cuts the energy spectrum waveform of general signal at its corresponding fractional fourier transform domain; Fig. 5 cuts the energy spectrum waveform of the mixed spread-spectrum signal of general signal and direct sequence signal stack at its corresponding fractional fourier transform domain, and Fig. 6 cuts mixed spread-spectrum signal that general signal and direct sequence signal the superpose energy spectrum waveform at frequency domain.
Embodiment
Embodiment one: the production method of the frequency domain direct enlarging-fractional number field frequency-hopping mixing signal in this execution mode is:
The step that signal generates: information source produces sends signal c (t), and said transmission signal c (t) is obtained the two-way binary digital signal through serial/parallel conversion, and said two-way binary digital signal is respectively the first via and sends signal c
1(t) and the second the tunnel send signal c
2(t);
The first via is sent signal c
1(t) carry out the step of DSSS: multiplying each other through the direct sequence that produces with the direct sequence generator obtains direct sequence signal c '
1(t), again to said direct sequence signal c '
1(t) carry out binary phase shift keying (BPSK) and then acquisition direct sequence signal s
1(t);
Send signal c to the second the tunnel
2(t) carry out the step of frequency hopping: FH Sequence Generator produces frequency hop sequences; Sequential value by said frequency hop sequences produces frequency hopping pattern; Output in real time has the general signal of cutting of different parameters k according to said frequency hopping pattern to cut general signal generator, and with receive the second the tunnel send signal c
2(t) carry out mixing and obtain fractional number field frequency-hopping signal s
2(t);
The step that mixing and signal send: with the direct sequence signal s that obtains in the above-mentioned steps
1(t) and fractional number field frequency-hopping signal s
2(t) addition obtains mixed spread spectrum transmission signal s (t), and said mixed spread spectrum transmission signal s (t) launches through the transmitting terminal antenna.
Send signal c said to the second the tunnel
2(t) carry out in the step of frequency hopping, the said positive and negative establishing method of cutting general signal generator parameter k is: send signal c according to the second the tunnel
2(t) code element situation produces and cuts general signal, and when said code element is 1, generating signal is the general signal of cutting of parameter k, and when said code element is 0, generating signal is the general signal of cutting of parameter-k.
The method of reseptance of the frequency domain direct enlarging-fractional number field frequency-hopping mixing signal in this execution mode is:
The step that signal receives: by forming received signal after reception antenna received signal and the filtering;
It is rapid to separate leapfrog: the FH Sequence Generator of receiving terminal produces and the frequency hop sequences that receives signal Synchronization, and the fractional Fourier transform device p rank fractional Fourier transform that under the control of said frequency hop sequences, disperses to received signal obtains p rank fourier-transformed signal r
p(u), the peak decision device is judged said p rank fourier-transformed signal r on the fractional number Fourier field of p rank
p(u) waveform peak position, and then obtain to separate jumper connection collection of letters r
2(u);
Despreading step: in receiving signal, deduct and separate jumper connection collection of letters r
2(u) obtain despread signal r
1(u), detailed process does, to the p rank fourier-transformed signal r that in separating leapfrog suddenly, obtains
p(u) the score field elimination peak value part signal on the p rank; Then to the signal 2-2p rank fractional Fourier transform that disperses; And to the signal after the conversion on the 2-2p rank score field elimination peak value part signal; Afterwards again to the signal p-2 rank fractional Fourier transform that disperses, obtain removing and separate jumper connection collection of letters r in time domain
2(u) the reception signal r after
1' (u), produce and the direct sequence that receives signal Synchronization with receiving terminal direct sequence generator then, jumper connection collection of letters r is separated in removal
2(u) the reception signal r after
1' (u) carry out despreading, at last the signal after the despreading is carried out demodulation and acquire despread signal r
1(u);
Signal blend step: with the despread signal r that obtains in the above-mentioned steps
1(u) conciliate jumping signal r
2(u) acquire the subscriber signal of original transmission through parallel/serial conversion.
Separate leapfrog rapid in, p value changes with the change of the sequential value of frequency hop sequences, when frequency hop sequences value change one time, the saltus step of p value once, the p value is corresponding one by one with the k value of transmitting terminal.
In separating leapfrog suddenly, the peak decision device is judged said p rank fourier-transformed signal r
pThe detailed process of waveform peak position (u) is: output 1 when peak appears at preceding half section of score field energy spectrum, output 0 when peak appears at the second half section of score field energy spectrum.
The generation and the method for reseptance of frequency domain direct enlarging in the present embodiment and fractional number field frequency-hopping hybrid spread spectrum signal; The process that produces signal at signal sending end is signal to be sent to be divided into two-way carry out DSSS and frequency hopping respectively and handle, and then with the transmission signal of generation hybrid spread spectrum after the Direct Sequence Spread Spectrum Signal that obtains and the Frequency Hopping Signal addition; At receiving terminal; Extracting the synchronizing signal of carrying in the received signal produces and the synchronous frequency hop sequences of received signal local FH Sequence Generator; Separate to received signal and jump into and obtain to separate the jumping signal; Simultaneously, another road demodulator circuit leaches the fractional number field frequency-hopping signal earlier from received signal, use then keep synchronous direct sequence with filtering with received signal after the signal despreading; Demodulation obtains despread signal again, and what will obtain at last separates jumping signal and despread signal by the parallel/serial subscriber signal that is converted to.
The generation device of the frequency domain direct enlarging-fractional number field frequency-hopping mixing signal described in this execution mode comprises information source 11, serial/parallel transducer 12, DSSS device 13, spread spectrum modulator 15, cut general signal generator 18, FH Sequence Generator 19, first filter 17 and adder 20; The signal output part of information source 11 is connected with the signal input part of serial/parallel transducer 12, two signal output parts of said serial/parallel transducer 12 respectively with the signal input part of DSSS device 13
,The signal input part of cutting general signal generator 18 connects; The signal output part of said DSSS device 13 is connected with the signal input part of spread spectrum modulator 15; The signal output part of said spread spectrum modulator 15 is connected with the signal input part of first filter 17; The Frequency Hopping Signal input of the signal output part of FH Sequence Generator 19 and Qie Pu signal generator 18 is connected; Saidly cut the signal output part of general signal generator 18, the signal output part of first filter 17 is connected with two signal input parts of adder 20 respectively, the signal output part of said adder 20 is exported armed output signal.
Comprise direct sequence generator and multiplier in the said DSSS device 13, multiplier produces direct sequence and the input signal acquisition direct sequence signal that multiplies each other with the direct sequence generator and exports to spread spectrum modulator 15.
Comprise carrier signal generator and multiplier in the said spread spectrum modulator 15, multiplier is given first filter 17 with the carrier signal of input signal and the carrier signal generator output spread-spectrum signal that obtains after the modulation that multiplies each other.
Comprise in the receiving system of the frequency domain direct enlarging-fractional number field frequency-hopping mixing signal described in this execution mode and connect second filter 32, P rank fractional Fourier transform device 33, FH Sequence Generator 34, the first fractional fourier transform domain filter 35,2-2P rank fractional Fourier transform device 36, the second fractional fourier transform domain filter 37, P-2 rank fractional Fourier transform device 38, despreader 39, extended frequency demodulator 41, the 3rd filter 43, peak value decision device 44 and parallel/serial transducer 45; A signal input part of the signal output part of second filter 32 and P rank fractional Fourier transform device 33 is connected; The Frequency Hopping Signal input of said P rank fractional Fourier transform device 33 and the signal output part of FH Sequence Generator 34 are connected; The signal output part of said P rank fractional Fourier transform device 33 is connected with the signal input part of peak value decision device 44, the signal input part of the first fractional fourier transform domain filter 35 respectively; The signal output part of the said first fractional fourier transform domain filter 35 is connected with the signal input part of 2-2P rank fractional Fourier transform device 36; The signal output part of said 2-2P rank fractional Fourier transform device 36 and the signal input part of the second fractional fourier transform domain filter 37 are connected; The signal output part of the said second fractional fourier transform domain filter 37 is connected with the signal input part of P-2 rank fractional Fourier transform device 38; The signal output part of said P-2 rank fractional Fourier transform device 38 and the signal input part of despreader 39 are connected; The signal output part of said despreader 39 is connected with the signal input part of extended frequency demodulator 41; The signal output part of said extended frequency demodulator 41 is connected with the signal input part of the 3rd filter 43; The signal output part of the signal output part of said the 3rd filter 43, peak value decision device 44 is connected with two signal input parts of parallel/serial transducer 45 respectively, the original signal of output output of said parallel/serial transducer 45.
Claims (8)
1. the production method of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal is characterized in that its detailed process comprises:
The step that signal generates: information source produces sends signal c (t), and said transmission signal c (t) is obtained the two-way binary digital signal through serial/parallel conversion, and said two-way binary digital signal is respectively the first via and sends signal c
1(t) and the second the tunnel send signal c
2(t);
The first via is sent signal c
1(t) carry out the step of DSSS: multiplying each other through the direct sequence that produces with the direct sequence generator obtains direct sequence signal c '
1(t), again to said direct sequence signal c '
1(t) carry out binary phase shift keying and then acquisition direct sequence signal s
1(t);
Send signal c to the second the tunnel
2(t) carry out the step of frequency hopping: FH Sequence Generator produces frequency hop sequences; Sequential value by said frequency hop sequences produces frequency hopping pattern; Output in real time has the general signal of cutting of different parameters k according to said frequency hopping pattern to cut general signal generator, and with receive the second the tunnel send signal c
2(t) carry out mixing and obtain fractional number field frequency-hopping signal s
2(t);
The step that mixing and signal send: with the direct sequence signal s that obtains in the above-mentioned steps
1(t) and fractional number field frequency-hopping signal s
2(t) addition obtains mixed spread spectrum transmission signal s (t), and said mixed spread spectrum transmission signal s (t) launches through the transmitting terminal antenna;
Parameter k representes to cut the frequency change rate of general signal, and the relation of k and bandwidth B is B=kT, and wherein T is for cutting general signal time domain width.
2. the production method of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal according to claim 1 is characterized in that sending signal c said to the second the tunnel
2(t) carry out in the step of frequency hopping, the said positive and negative establishing method of cutting general signal generator parameter k is: send signal c according to the second the tunnel
2(t) code element situation produces and cuts general signal, and when said code element is 1, generating signal is the general signal of cutting of parameter k, and when said code element is 0, generating signal is the general signal of cutting of parameter-k.
3. the method for reseptance of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal is characterized in that its detailed process comprises:
The step that signal receives: by forming received signal after reception antenna received signal and the filtering;
It is rapid to separate leapfrog: FH Sequence Generator produces and the frequency hop sequences that receives signal Synchronization, and the fractional Fourier transform device p rank fractional Fourier transform that under the control of said frequency hop sequences, disperses to received signal obtains p rank fourier-transformed signal r
p(u), the peak decision device is judged said p rank fourier-transformed signal r on the fractional number Fourier field of p rank
p(u) waveform peak position, and then obtain to separate jumper connection collection of letters r
2(u);
Despreading step: in receiving signal, deduct and separate jumper connection collection of letters r
2(u) obtain despread signal r
1(u), detailed process does, to the p rank fourier-transformed signal r that in separating leapfrog suddenly, obtains
p(u) the score field elimination peak value part signal on the p rank; Then to the signal 2-2p rank fractional Fourier transform that disperses; And to the signal after the conversion on the 2-2p rank score field elimination peak value part signal; Afterwards again to the signal p-2 rank fractional Fourier transform that disperses, obtain removing and separate jumper connection collection of letters r in time domain
2(u) the reception signal r after
1' (u), produce and the direct sequence that receives signal Synchronization with receiving terminal direct sequence generator then, separate jumper connection collection of letters r to removing in time domain
2(u) the reception signal r after
1' (u) carry out despreading, at last the signal after the despreading is carried out demodulation and acquire despread signal r
1(u);
Signal blend step: with the despread signal r that obtains in the above-mentioned steps
1(u) conciliate jumping signal r
2(u) acquire the subscriber signal of original transmission through parallel/serial conversion.
4. the method for reseptance of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal according to claim 3 is characterized in that the peak decision device is judged said p rank fourier-transformed signal r in separating leapfrog suddenly
pThe detailed process of waveform peak position (u) is: output 1 when peak appears at preceding half section of score field energy spectrum, output 0 when peak appears at the second half section of score field energy spectrum.
5. the generation device of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal; It comprises information source (11); It is characterized in that it also comprises serial/parallel transducer (12), DSSS device (13), spread spectrum modulator (15), cuts general signal generator (18), FH Sequence Generator (19), first filter (17) and adder (20); The signal output part of information source (11) is connected with the signal input part of serial/parallel transducer (12); Two signal output parts of said serial/parallel transducer (12) are connected with the signal input part of DSSS device (13), the signal input part of cutting general signal generator (18) respectively; The signal output part of said DSSS device (13) is connected with the signal input part of spread spectrum modulator (15); The signal output part of said spread spectrum modulator (15) is connected with the signal input part of first filter (17); The signal output part of FH Sequence Generator (19) is connected with the Frequency Hopping Signal input of Qie Pu signal generator (18); Saidly cut the signal output part of general signal generator (18), the signal output part of first filter (17) is connected with two signal input parts of adder (20) respectively, the signal output part of said adder (20) is exported armed output signal;
Output in real time has the general signal of cutting of different parameters k according to frequency hopping pattern to cut general signal generator (18), and with receive the second the tunnel send signal c
2(t) carry out mixing and obtain fractional number field frequency-hopping signal s
2(t), said frequency hopping pattern is that the sequential value of the frequency hop sequences that produced by FH Sequence Generator produces, and parameter k representes to cut the frequency change rate of general signal, and the relation of k and bandwidth B is B=kT; Wherein T is for cutting general signal time domain width; Said the second the tunnel sends signal c
2(t) be that serial/parallel transducer (12) outputs to and cuts general signal generator (18).
6. the generation device of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal according to claim 5; It is characterized in that comprising direct sequence generator and multiplier in the said DSSS device (13), the direct sequence that multiplier produces the direct sequence generator and the input signal acquisition direct sequence signal that multiplies each other is exported to spread spectrum modulator (15).
7. the generation device of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal according to claim 5; It is characterized in that comprising carrier signal generator and multiplier in the said spread spectrum modulator (15) that multiplier is given first filter (17) with the carrier signal of input signal and the carrier signal generator output spread-spectrum signal that obtains after the modulation that multiplies each other.
8. the receiving system of frequency domain direct enlarging-fractional number field frequency-hopping mixing signal; It is characterized in that it comprises second filter (32), P rank fractional Fourier transform devices (33), FH Sequence Generator (34), the first fractional fourier transform domain filter (35), 2-2P rank fractional Fourier transform devices (36), the second fractional fourier transform domain filter (37), P-2 rank fractional Fourier transform devices (38), despreader (39), extended frequency demodulator (41), the 3rd filter (43), peak value decision device (44) and parallel/serial transducer (45); A signal input part of the signal output part of second filter (32) and P rank fractional Fourier transform devices (33) is connected; The Frequency Hopping Signal input of said P rank fractional Fourier transform devices (33) is connected with the signal output part of FH Sequence Generator (34); The signal output part of said P rank fractional Fourier transform devices (33) is connected with the signal input part of peak value decision device (44), the signal input part of the first fractional fourier transform domain filter (35) respectively; The signal output part of the said first fractional fourier transform domain filter (35) is connected with the signal input part of 2-2P rank fractional Fourier transform devices (36); The signal output part of said 2-2P rank fractional Fourier transform devices (36) is connected with the signal input part of the second fractional fourier transform domain filter (37); The signal output part of the said second fractional fourier transform domain filter (37) is connected with the signal input part of P-2 rank fractional Fourier transform devices (38); The signal output part of said P-2 rank fractional Fourier transform devices (38) is connected with the signal input part of despreader (39); The signal output part of said despreader (39) is connected with the signal input part of extended frequency demodulator (41); The signal output part of said extended frequency demodulator (41) is connected with the signal input part of the 3rd filter (43); The signal output part of the signal output part of said the 3rd filter (43), peak value decision device (44) is connected with two signal input parts of parallel/serial transducer (45) respectively, the original signal of output output of said parallel/serial transducer (45);
FH Sequence Generator (34) produces and the frequency hop sequences that receives signal Synchronization, and said reception signal is meant through reception antenna and receives the reception signal that forms after signal and the filtering;
P rank fractional Fourier transform devices (33) the p rank fractional Fourier transform that under the control of said frequency hop sequences, disperses to received signal obtains p rank fourier-transformed signal r
p(u);
Peak value decision device (44) is judged said p rank fourier-transformed signal r on the fractional number Fourier field of p rank
p(u) waveform peak position, and then obtain to separate jumper connection collection of letters r
2(u);
The first fractional fourier transform domain filter (35) is to p rank fourier-transformed signal r
p(u) the score field elimination peak value part signal on the p rank;
The second fractional fourier transform domain filter (37) to the signal of input input on the 2-2p rank score field elimination peak value part signal;
Despreader (39) utilizes receiving terminal direct sequence generator to produce and the direct sequence that receives signal Synchronization, separates jumper connection collection of letters r to removing in time domain
2(u) the reception signal r after
1' (u) carry out despreading; Said reception signal r
1' (u) be that P-2 rank fractional Fourier transform devices (38) are exported to the signal of despreader (39).
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| CN101674104B (en) * | 2009-09-23 | 2013-01-09 | 电子科技大学 | Synchronous acquisition method based on PN sequence likelihood ratio in FFH system |
| CN101888262B (en) * | 2010-06-13 | 2013-08-14 | 电子科技大学 | High-density differential frequency hopping communication method |
| CN104393891B (en) * | 2014-11-27 | 2017-05-10 | 电子科技大学 | Communication method for driving frequency spreading/frequency hopping of direct sequence by adopting information |
| CN106100695A (en) * | 2016-06-14 | 2016-11-09 | 西安电子科技大学 | A kind of pattern modulation frequency hopping Anti TBIgG method based on Constructing Chaotic Code |
| CN107769816B (en) * | 2017-11-01 | 2020-10-09 | 中山大学花都产业科技研究院 | Chirp spread spectrum communication system receiver time synchronization system and method |
| CN109088677A (en) * | 2018-08-23 | 2018-12-25 | 国网江苏省电力有限公司盐城供电分公司 | A kind of anti-interference automatic checkout system of communication equipment |
| CN109547060B (en) * | 2018-11-22 | 2021-03-19 | 北京睿信丰科技有限公司 | Frequency hopping spread spectrum signal transmitting device, frequency hopping spread spectrum signal receiving device, frequency hopping spread spectrum communication system and frequency hopping spread spectrum communication method |
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| CN1232330A (en) * | 1998-01-20 | 1999-10-20 | 三星电子株式会社 | Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system |
| WO1999060718A1 (en) * | 1998-05-19 | 1999-11-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency-hopping radio system with hybrid direct-sequence/hopping mode during start-up |
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|---|---|---|---|---|
| CN1232330A (en) * | 1998-01-20 | 1999-10-20 | 三星电子株式会社 | Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system |
| WO1999060718A1 (en) * | 1998-05-19 | 1999-11-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency-hopping radio system with hybrid direct-sequence/hopping mode during start-up |
| CN2462618Y (en) * | 2001-01-16 | 2001-11-28 | 信息产业部电子第五十四研究所 | Extended frequency hopping signal modem |
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