CN102355281B - Combinable frequency hopping wireless transmitting-receiving system and operation method thereof - Google Patents
Combinable frequency hopping wireless transmitting-receiving system and operation method thereof Download PDFInfo
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Abstract
The invention provides a combinable frequency hopping wireless transmitting-receiving system and an operation method thereof. The system comprises a transmitter and receiver. The transmitter comprises a data interface, a frequency hopping framing device, a transmitter differential frequency hopping module, a transmitter conventional frequency hopping module, a D/A converter and a front emission circuit which are connected in order. The receiver comprises a front receiving circuit, an A/D converter, a receiver conventional frequency hopping module, a receiver differential frequency hopping module, a frequency hopping decoding frame device and a data interface which are connected in order. According to the operation method of the system, a whole work frequency range is divided into M sub frequency ranges with an equal bandwidth, change of conventional frequency hopping is carried out between each segment of frequency band, and change of differential frequency hopping is carried out in a segment. Through conventional frequency hopping, differential frequency hopping and real-time full frequency range frequency hopping, the transmitter generates a frequency hopping signal to be sent. A receiving end completes de-hopping of a received signal according to an opposite sequence, and restores data information. In the invention, two kinds of frequency hopping are employed, two advantages are fully utilized, randomness, anti-interference and anti-investigation capability of the system are raised, and frequency hopping communication performance is effectively raised.
Description
(1) technical field
The present invention relates to the wireless frequency hopping communication field of wireless communication technology, be specially two kinds of frequency-hopping modes of a kind of comprehensive employing and two-stage hopping structure, realize Synthesized Frequency Hopping wireless transceiver system and the operation method thereof of high-speed radio frequency hopping communications by hybrid mode.
(2) background technology
Be different from traditional conventional frequency hopping, differential jumping frequency (DFH, Differential Frequency Hopping) technology has represented the new development of modern Frequency-hopping Communication Technology, even can realize high-speed frequency-hopping (frequency hopping rate can reach 5000Hop/s) and high speed data transfer (transmission rate can reach 19.2kbit/s) on the shortwave frequency range, greatly improved the ability that anti-tracking is disturbed and investigated, the validity of transfer of data greatly improves.
The order implementation of various conventional frequency-hopping system coding, modulation and frequency hopping, in DFH communication system, coding, modulation and frequency hopping adopt the integrated implementation of Trellis-coded modulation (TCM, Trellis Coded Modulation).Transmitting terminal, information data after chnnel coding, then are that frequency hop sequences is controlled digital controlled oscillator (DDS, Direct Digital Synthesizer) and produced corresponding frequency-hopping carrier through the G Function Mapping; At receiving terminal, the A/D sampled signal is carried out producing after the digital quadrature down-conversion signal of two-way quadrature, subsequently it is carried out fast fourier transform (FFT, Fast Fourier Transformation), transformation results obtains effective Frequency Hopping Signal through the judgement of frequency hopping detecting unit, then demodulates the data message of transmission according to the good rule of predefined through the frequency sequence decoding module.
If frequency-hopping system can be realized real-time full frequency band frequency hopping, to the lifting of the antijamming capability of system with of great advantage.But due to the restriction of the software and hardware resources that is subject to digital signal processing unit, the differential jumping frequency mode is difficult to realize wider frequency range saltus step.For example, if will realize that (3～30MHz) frequency hoppings, according to bandpass sample theory, the sampling rate of ADC is f to short-wave all-frequency band
s〉=60Msps.If directly with so high speed sampling, the signals such as its follow-up fast fourier transform (FFT, Fast Fourier Transformation) data operation are processed extremely difficult the realization.Existing relevant enhancement mode frequency-hopping system (CHESS, Correlated Hopping Enhanced Spread Spectrumd) adopt " segmentation frequency hopping " to solve, be about to short-wave band and be divided into several frequency ranges, get one of them frequency range as working frequency range, adopt the method for quadrature frequency conversion, signal is become the second mining sample signal of given pace, again this signal is carried out fast fourier transform (FFT, Fast Fourier Transformation) subsequently and process.This method has effectively been alleviated fast fourier transform (FFT, Fast Fourier Transformation) realize difficulty, reduced the requirement of signal processing to hardware, but but greatly reduced frequency hopping scope (being generally the 2MHz left and right), also greatly reduced the ability of anti-interference and anti-investigation.
In addition, DFH communication system quadrature networking performance is poor.For the communication at alone family, DFH communication system can provide higher data transmission rate, and owing to not existing alien frequencies to disturb, its reliability is also very high.When in net, a plurality of user being arranged, if adopt asynchronous quadrature networking, its consequence is that the availability of frequency spectrum sharply descends.If adopt asynchronous nonopiate networking, owing to existing the alien frequencies between subnet to disturb, the place one's entire reliance upon error correction capability of system of the performance of DFH communication system itself, restricted by the encoding characteristics relevant to the detection of maximum likelihood frequency sequence.If improve the error correction capability of system, the complexity of realization is with corresponding improve.
The R-S sequence has good orthogonality, can realize " collisionless " networking when synchronous network, and performance is also very good when asynchronous networking, if conventional frequency hop sequences adopts the R-S code, system can more easily realize the quadrature networking.But the attainable hop rate of conventional jumping system is lower, and data transmission rate is also lower.
(3) summary of the invention
The objective of the invention is to design a kind of Synthesized Frequency Hopping wireless transceiver system, comprise conventional frequency hopping and differential jumping frequency two macrostructures, realize real-time full frequency band frequency hopping, effectively strengthened anti-interference and anti-investigation ability.
Another object of the present invention is the operation method of a kind of Synthesized Frequency Hopping wireless transceiver system of design, and transmitting terminal is by conventional frequency hopping and differential jumping frequency, and the full frequency band frequency hopping, generate Frequency Hopping Signal to be sent in real time; The solution that receiving terminal is completed is to received signal in reverse order jumped, and restores data message.
The Synthesized Frequency Hopping wireless transceiver system of the present invention's design comprises the transmitter and receiver two large divisions.
Transmitter mainly comprises: the transmitter data interface that is linked in sequence, frequency hopping framer, transmitter differential jumping frequency module, the conventional frequency hopping module of transmitter, D/A converter (digital-to-analog converter) and rf broadband front end emission circuit.Wherein transmitter differential jumping frequency module contains frequency sequence encoder, differential jumping frequency FREQUENCY CONTROL word memory (ROM), interpolation device and the differential jumping frequency digital controlled oscillator (differential jumping frequency NCO) that connects successively; The conventional frequency hopping module of transmitter contains transmitter R-S sequencer, conventional frequency hopping FREQUENCY CONTROL word memory (ROM1), interpolation filter, transmitter frequency hopping digital controlled oscillator (transmitter frequency hopping NCO) and subtracter.An output access frequency hopping framer of transmitter R-S sequencer, another output are through conventional frequency hopping band frequency control word memory access transmitter frequency hopping NCO, Q road and the I road signal of differential jumping frequency NCO output access respectively an interpolation filter, the two-way frequency-hopping carrier signal mixing that I road after the interpolation of 2 interpolation filters output and Q road differential jumping frequency signal produce with transmitter frequency hopping NCO respectively, obtain I
1Road and Q
1The road signal, the access subtracter.Gained Q
1Road signal and I
1Road signal poor, send into rf broadband front end emission circuit through the D/A converter.
Receiver mainly comprises: the rf broadband front end receiving circuit (RF front-end wideband receiving circuit) that connects successively, A/D converter (A-D converter), the conventional frequency hopping module of receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI.Wherein the conventional frequency hopping module of receiver comprises solution jumping figure controlled oscillator (separate and jump NCO), decimation filter, low pass filter, conventional frequency hopping synchronizer, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform (FFT Fast Fourier Transformation) module (FFT module), frequency sequence decoder and jumping along synchronizer, and the frequency sequence decoder connects viterbi decoder by the carrier frequency identifier and forms.The output access frequency sequence decoder of FFT module and jumping, along synchronizer, are jumped the module along synchronizer feedback access FFT.The synchronizing information of frequency hopping deframer output accesses conventional frequency hopping synchronizer, the output connection receiver R-S sequencer of conventional frequency hopping synchronizer, then access to separate and jump NCO, the 2 tunnel carrier signals that solution jumping NCO sends and A/D converter high-speed data are sampled and are obtained Q
1And I
1After the two paths of signals mixing respectively through decimation filter and low pass filter obtains the Q road and I road signal is sent into receiver differential jumping frequency module.
The conventional frequency hopping module of above-mentioned transmitter, transmitter differential jumping frequency module, the conventional frequency hopping module of receiver and receiver differential jumping frequency module all adopt digital signal processor (DSP, Digital Signal Processing) to realize.The core of digital signal processing module is field programmable gate array (FPGA, Field-programmable Gate Array).
The operation method of the Synthesized Frequency Hopping wireless transceiver system of the present invention's design is divided into the M section with whole shortwave frequency range, and every section bandwidth all equates, the saltus step between each section frequency band of conventional frequency hopping, saltus step in section of differential jumping frequency.
This operation method specifically is divided into the operation of transmitter and receiver,
The concrete operating procedure of the Frequency Hopping Signal that the transmitter generation is to be sent is as follows:
I, by data-interface, transmitter reads data message to be sent;
II, frequency hopping framer read the synchronizing information (buffer status information and clock information) of R-S sequencer generation and the data message to be sent of data-interface simultaneously, carry out the framing design, information is sent into the differential jumping frequency module and is processed after framing;
Information data after III, framing is sent into the frequency sequence encoder of transmitter differential jumping frequency module, information data after this frequency transfer function is with framing is carried out the differential coding mapping, or be referred to as frequency sequence coding, obtain the differential jumping frequency sequence information, use sequence number value as address again, access differential jumping frequency signal frequency control word memory ROM, obtain sending into interpolation device after differential jumping frequency signal frequency control word;
IV, at interpolation device, the differential jumping frequency sequence is carried out interpolation processing, by frequency control word being carried out interpolation, process, its sample rate is promoted to differential jumping frequency NCO sample rate and mates;
Information after V, interpolation processing enters differential jumping frequency NCO, and differential jumping frequency NCO reads differential jumping frequency signal frequency control word, output I, differential jumping frequency signal Q two-way quadrature and relevant to input data information, and 1. I, Q two paths of signals represent with formula, f in formula
cFrequency for the differential jumping frequency signal.
S
I(t)＝cos(f
ct) S
Q(t)＝sin(f
ct)①
The interpolation filter that VI, I, Q two-pass DINSAR Frequency Hopping Signal enter respectively the conventional frequency hopping module of transmitter carries out interpolation, and its sample rate is increased to f
s, the output signal data rate of its data transfer rate and transmitter frequency hopping NCO is complementary;
VII, transmitter R-S sequencer output pseudo random sequence, and use sequence number value as the conventional frequency hopping band frequency control word memory ROM1 of address access, obtain sending into transmitter frequency hopping NCO after frequency control word;
VIII, transmitter frequency hopping NCO read conventional frequency hopping band frequency control word, and the hop rate that produces the two-way quadrature is R
fFrequency-hopping carrier,, with I road and the differential jumping frequency signal phase mixing of Q road after interpolation, obtain I respectively
1Road and Q
1The hop rate of road two-way quadrature is the conventional frequency-hopping carrier signal of 5Hop/s, 2. represents f in formula with formula
qFrequency for the selected frequency range of conventional frequency-hopping system.
S
I1(t)＝cos(f
qt) S
Q1(t)＝sin(f
qt)②
IX, I
1Road and Q
1Road enters subtracter and obtains both poor, Q
1Road signal and I
1The difference of road signal by the D/A converter, send into rf broadband front end emission circuit, by antenna transmission.3. transmitted signal can represent with formula, f
cFor the frequency of differential jumping frequency signal, f
qFrequency for the selected frequency range of conventional frequency-hopping system.
S(t)＝S
I(t)-S
Q(t)＝cos(f
ct)*cos(f
qt)-sin(f
ct)*sin(f
qt)＝cos[(f
c+f
q)t]③
In described Step II, after the frequency hopping framer reads the data message to be sent of synchronizing information that the R-S sequencer produces and data-interface simultaneously, be the initial synchronisation frame in the initial synchronisation stage design, at the duties synchronous phase, be designed to the duties Frame, complete the framing design.
The solution that receiver is completed is to received signal jumped, and the concrete operating procedure that restores data message is as follows:
The rf broadband front end receiving circuit of i, receiver, by the radiofrequency signal that radio-frequency antenna and its preposition radio frequency (RF) amplifier obtain, is sent into the A/D converter and is carried out the high-speed data sampling, obtains Q
1And I
1Two paths of signals;
The synchronizing information that ii, conventional frequency hopping synchronizer demodulate according to the frequency hopping deframer, adjust local pseudo-code generator state information and clock information (TOD information, Time of the Day), synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the R-S pseudo noise code consistent with the radiofrequency signal saltus step rule of transmitter transmission;
Jumping figure controlled oscillator (separate and jump NCO) is separated in the access of iii, receiver R-S sequencer, controls to separate and jumps NCO and produce the 2 road frequency-hopping carrier signals consistent with the radiofrequency signal saltus step rule of the transmission of transmitter, the Q that obtains with step I respectively
1And I
1The signal mixing realizes separating conventional the jumping;
Iv, the 2 road signals of separating after routine is jumped carry out the orthogonal digital down-conversion through decimation filter respectively, interference signal outside low pass filter filters out is fallen band, and the differential jumping frequency signal that obtains Q road and I road quadrature is sent into receiver differential jumping frequency module;
V, jumping along under the control of synchronizer, the fast fourier transform module is determined the initial time (namely jumping along synchronous) of Frequency Hopping Signal, and calculates amplitude and the phase information of every jumping signal, sends into afterwards the carrier frequency identifier
Vi, carrier frequency identifier rule out effective Frequency Hopping Signal according to amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering corresponding to the transmitter transmitted signal, then numbering is sent into viterbi decoder;
Vii, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, then are sent to the frequency hopping deframer;
Viii, frequency hopping deframer are completed the detection of synchronizing information associated code and to the frame of tearing open of demodulating information, and synchronizing information is fed back to the frequency hopping synchronizer, and useful data message is sent to the information end user through data-interface.
Described step I i, in the initial synchronisation stage, periodic sequence that increases progressively of conventional frequency hopping synchronizer control receiver R-S sequencer output (0,1 ... M-1,0,1 ... M-1,0 ...), the sequential value hop rate is 100Hop/s.
In described step I i, if do not complete and catch after surpassing 6s sweep time, conventional frequency hopping synchronizer control receiver R-S sequencer stops scanning output, transfer output one fixed value to, control to separate and jump NCO output one fixed carrier (the receiver frequency range is fixed in certain frequency range), until complete, catch.Subsequently, conventional frequency hopping synchronizer enters and receives pseudo noise code state information and TOD information state, by the time after synchronous end mark signal being detected, just control receiver R-S sequencer with the pseudo noise code state information that receives and TOD information and carry out the state renewal, and then the generation R-S pseudo noise code consistent with transmitter.
In described step I ii, separating the 2 road frequency-hopping carrier signals of jumping the NCO generation is that hop rate is the local carrier of the 2 road quadratures of 100Hop/s, and controlling and separating jumping figure controlled oscillator output one hop rate is the carrier wave of 100Hop/s.
In described step v, within a sweep time, jump along synchronizer and jump rapidly along adjusting.Because difference is jumped along synchronously only needing 13 to jump to complete and jump along synchronous, if therefore scan and transmit, one sweep time introskip can adjust rapidly until complete and jump along synchronous along synchronizer.
In described step viii, the frequency hopping deframer carries out coherent detection to the synchronizing information that comprises synchronous head, if synchronous head detected, just send command control receiver R-S sequencer and stop scanning output, and then control to separate and jump NCO output current carrier wave (resting on current frequency range), so far just completed synchronous catching.
In described step viii, after completing synchronization acquistion, the synchronizing information that the frequency hopping deframer will demodulate (pseudo noise code state information and TOD information) feeds back to conventional frequency hopping synchronizer.
This operation method is divided into a plurality of equal frequency sub-band, the total bandwidth B of working frequency range with whole working frequency range
wBy formula B
w〉=M * 2*[N * B
s+ B
h] determine, wherein M is the band number of conventional frequency hopping, N is the frequency number of differential jumping frequency in each frequency range, B
sFor channel spacing, B
hFor transition band width.
Value to M, N will comprehensively be weighed.When getting M=1, this system is exactly simple DFH communication system.The M value is larger, and conventional frequency hopping band number is more, and multiple access performance is better, is beneficial to the quadrature networking of system, but conventional frequency hopping synchronously realizes difficulty, can further increase.The N value of corresponding differential jumping frequency is less, and the differential jumping frequency hardware resource consumption is less.But differential jumping frequency frequency number is very few, and freely distance can be less, and the error correcting capability of system is poorer, and the performance of differential jumping frequency is difficult to improve.Otherwise, corresponding problem is also arranged.The distribution value of M, N involves multiple access performance, complexity and cost, must think better of.
The distribution principle of the present invention design is that whole shortwave working frequency range is divided into M frequency sub-band that equates, the frequency difference after segmentation between any two conventional frequency hopping points is more than or equal to the differential jumping frequency bandwidth B of 2 times
c, namely | f
qi-f
qj| 〉=2B
cI, j=1,2..M, and f
qi＞2B
cI=1,2..M.Guarantee only to keep useful signal after mixing and filtering when the receiver frequency range is consistent with the transmitter frequency range.
The advantage of Synthesized Frequency Hopping wireless transceiver system of the present invention and operation method thereof is: 1, adopt the form of two kinds of frequency-hopping modes and two-stage hopping structure, take full advantage of the advantage separately of dual mode and the cascade characteristics of two kinds of structures; Rear class adopts the differential jumping frequency mode, has kept the advantages such as the saltus step of differential jumping frequency high speed and high speed data transfer, and prime adopts conventional random frequency hopping mode simultaneously, has obtained the quadrature networking performance, and performance is much better than DFH communication system in multi-user's situation; This frequency-hopping system can be realized large-spacing saltus step between frequency range, also just realize the full frequency band frequency hopping, thus can be the frequency hopping bandwidth expansion to whole shortwave frequency range, has wider frequency hopping bandwidth, greatly enriched frequency hopping frequency number, improved randomness and anti-interference, the anti-investigation ability of system, the error performance of system is better than the system of simple employing differential jumping frequency far away, effectively improves the performance of frequency hopping communications; 2, reduce the requirement of differential jumping frequency to hardware size and technology, also reduced the difficulty of hardware cost and realization; 3, the hopping structure of two-stage cascade, parameter and performance can rationally be shared and exchange, and can divide flexibly frequency range according to number of users and hardware resource, and balance between complexity and cost, guaranteed the flexibility in the design; For example, can reduce rear class differential jumping frequency frequency number, increase the conventional frequency hopping frequency of prime number, reduce the differential jumping frequency intractability; 4, the R-S sequence has good orthogonality, can realize " collisionless " networking when synchronous network, and performance is also very good when asynchronous networking; Prime adopts the R-S code as pseudo noise code, and frequency-hopping system can be realized the quadrature networking; 5, the low hop rate cascade of the high jump sepeed of differential jumping frequency and conventional frequency hopping, more be conducive to the realization of system synchronization; Conventional frequency hopping rate is lower, can transfer all synchronizing informations within a conventional time of jumping, and realizes that more easily frequency hopping is synchronous.
(4) description of drawings
Fig. 1 is the structured flowchart of this Synthesized Frequency Hopping wireless transceiver system embodiment transmitter;
Fig. 2 is the structured flowchart of this Synthesized Frequency Hopping wireless transceiver system embodiment receiver.
(5) embodiment
Synthesized Frequency Hopping wireless transceiver system embodiment
As shown in Figure 1, receiver as shown in Figure 2 for the transmitter of this Synthesized Frequency Hopping wireless transceiver system embodiment.
Transmitter mainly comprises: the transmitter data interface that is linked in sequence, frequency hopping framer, transmitter differential jumping frequency module, the conventional frequency hopping module of transmitter, D/A converter and rf broadband front end emission circuit.Wherein transmitter differential jumping frequency module contains frequency sequence encoder, differential jumping frequency signal frequency control word memory (ROM), interpolation device and the differential jumping frequency digital controlled oscillator (differential jumping frequency NCO) that connects successively; The conventional frequency hopping module of transmitter contains transmitter R-S sequencer, interpolation filter, transmitter frequency hopping digital controlled oscillator (transmitter frequency hopping NCO) and subtracter.An output access frequency hopping framer of transmitter R-S sequencer, another output are through conventional frequency hopping band frequency control word memory access transmitter frequency hopping NCO, Q road and the I road signal of differential jumping frequency NCO output access respectively an interpolation filter, the two-way frequency-hopping carrier signal mixing that I road after the interpolation of 2 interpolation filters output and Q road differential jumping frequency signal produce with transmitter frequency hopping NCO respectively, obtain I
1Road and Q
1The road signal, the access subtracter.Gained Q
1Road signal and I
1Road signal poor, send into rf broadband front end emission circuit through the D/A converter.
Receiver mainly comprises: the low noise rf broadband front end receiving circuit (low noise RF wideband frontend receiving circuit) that connects successively, A/D converter, the conventional frequency hopping module of receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI.Wherein the conventional frequency hopping module of receiver comprises solution jumping NCO, decimation filter, low pass filter, conventional frequency hopping synchronizer, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform (FFT Fast Fourier Transformation) module, frequency sequence decoder and jumping along synchronizer, and the frequency sequence decoder connects viterbi decoder by the carrier frequency identifier and forms.The output access frequency sequence decoder of FFT module and jumping, along synchronizer, are jumped the module along synchronizer feedback access FFT.The synchronizing information of frequency hopping deframer output accesses conventional frequency hopping synchronizer, the output connection receiver R-S sequencer of conventional frequency hopping synchronizer, then access to separate and jump NCO, the 2 tunnel carrier signals that solution jumping NCO sends and A/D converter high-speed data are sampled and are obtained Q
1And I
1After the two paths of signals mixing respectively through decimation filter and low pass filter obtains the Q road and I road signal is sent into receiver differential jumping frequency module.
The conventional frequency hopping module of above-mentioned transmitter, transmitter differential jumping frequency module, the conventional frequency hopping module of receiver and receiver differential jumping frequency module all use FPGA (field programmable gate array) to realize.
The operation method embodiment of Synthesized Frequency Hopping wireless transceiver system
This routine whole shortwave working frequency range 6MHZ～30MHZ,
Differential jumping frequency speed: R
c=2500Hop/s
Rate of information transmission: b=2000bit/s
Chip rate: R=2500symbol/s
Conventional frequency hopping rate: R
f=5Hop/s
Frequency sub-band number: M=8
Minimum channel interval: B
s=45KHZ
In each frequency sub-band, differential jumping frequency is counted: N=32
The total frequency hopping of system is counted: N
1=32*8=256
Radio frequency sampling rate: f
s=76.8MSPS
Sampling Rate: f
s1=7.68MSPS
The fan leaves coefficient (bit number is carried in every jumping): BPH=2
Differential jumping frequency bandwidth: B
c=32*45KHZ=1.44MHZ
Transition band width: B
h=0.06MHZ
Conventional frequency hopping band frequency: 3,6,9,12,15,18,21,24MHZ, namely
| f
qi-f
qj| 〉=2B
c, i, j=1,2 ... 8,, and f
qi＞2B
c.
B
M〉=M * 2[N * B
s+ B
h], i.e. B
M〉=8 * 2[32 * 45+60]=24,
Be f
qi＞2B
cI=1,2..M.
The concrete operating procedure that this routine transmitter generates Frequency Hopping Signal to be sent is as follows:
I, by data-interface, transmitter reads data message to be sent.
II, frequency hopping framer read the synchronizing information (buffer status information and clock information) of R-S sequencer generation and the data message to be sent of data-interface simultaneously, be the initial synchronisation frame in the initial synchronisation stage design, be designed to the duties Frame at the duties synchronous phase, complete the framing design; This routine synchronizing information data transfer rate is 2500bit/s, and data message data transfer rate to be sent is 2000bit/s, and after framing, data transfer rate is 2500bit/s, and information is sent into the differential jumping frequency module and processed after framing.
The frequency sequence encoder of sending into the differential jumping frequency module after III, framing, information data after this frequency transfer function is with framing is carried out the differential coding mapping, or be referred to as frequency sequence coding, obtain the differential jumping frequency sequence information, use sequence number value as address again, and access differential jumping frequency signal frequency control word memory ROM, obtain sending into interpolation device after frequency control word, the frequency control word sample rate is 2500SPS, and the difference hop rate is 2500Hop/s.
IV, at interpolation device, the differential jumping frequency sequence is carried out interpolation processing, by frequency control word being carried out interpolation, process, its sample rate is promoted to differential jumping frequency NCO sample rate and mates.
The sample rate of differential jumping frequency NCO is 7.68MSPS, and differential jumping frequency signal frequency control word sample rate is 2500MSPS, therefore need to carry out 3072 times of interpolations to frequency control word and process; Interpolation device is used for completing this function, by frequency control word being carried out 3072 times of interpolations, processes, and its sample rate is promoted to 7.68MSPS by 2500SPS, with differential jumping frequency NCO sample rate, mates.
Information after V, interpolation processing enters differential jumping frequency NCO, and differential jumping frequency NCO reads differential jumping frequency signal frequency control word, output I, differential jumping frequency signal Q two-way quadrature and relevant to input data information, and 1. I, Q two paths of signals represent with formula, f in formula
cFrequency for the differential jumping frequency signal.
S
I(t)＝cos(f
ct) S
Q(t)＝sin(f
ct)①
The interpolation filter that VI, I, Q two-pass DINSAR Frequency Hopping Signal enter respectively conventional frequency hopping module carries out interpolation, and its sample rate is increased to f
s, the output signal data rate of its data transfer rate and transmitter frequency hopping NCO is complementary;
Because transmitter frequency hopping NCO data transfer rate is 76.8MSPS, the differential jumping frequency signal data rate is 7.68MSPS,, for two data transfer rate couplings, needs the differential jumping frequency signal is carried out 10 times of up-samplings.Interpolation filter just is used for completing this function, by the interpolation of the differential jumping frequency signal being carried out 10 times, processes, and its sample rate is promoted to 76.8MSPS from 7.68MSPS.
VII, transmitter R-S sequencer output pseudo random sequence, and use sequence number value as the conventional frequency hopping band frequency control word memory ROM1 of address access, band frequency control word hop rate is 5Hop/s.
VIII, transmitter frequency hopping NCO read conventional frequency hopping band frequency control word, and the hop rate that produces the two-way quadrature is R
fFrequency-hopping carrier,, with I road and the differential jumping frequency signal phase mixing of Q road after interpolation, obtain I respectively
1Road and Q
1The hop rate of road two-way quadrature is the conventional frequency-hopping carrier signal of 5Hop/s, 2. represents f in formula with formula
qFrequency for the selected frequency range of conventional frequency-hopping system.
S
I1(t)＝cos(f
qt) S
Q1(t)＝sin(f
qt)②
IX, I
1Road and Q
1Road enters subtracter and obtains both poor, Q
1Road signal and I
1The difference of road signal by the D/A converter, send into rf broadband front end emission circuit, by antenna transmission.3. transmitted signal can represent with formula, f
cFor the frequency of differential jumping frequency signal, f
qFrequency for the selected frequency range of conventional frequency-hopping system.
S(t)＝S
I(t)-S
Q(t)＝cos(f
ct)*cos(f
qt)-sin(f
ct)*sin(f
qt)＝cos[(f
c+f
q)t]③
The solution that this routine receiver is completed is to received signal jumped, and the concrete operating procedure that restores data message is as follows:
The rf broadband front end receiving circuit of i, receiver, by the radiofrequency signal that radio-frequency antenna and its preposition radio frequency (RF) amplifier obtain, is sent into the A/D converter and is carried out the high-speed data sampling, obtains Q
1And I
1Two paths of signals;
The synchronizing information that ii, conventional frequency hopping synchronizer demodulate according to the frequency hopping deframer, adjust local pseudo-code generator state information and clock information, synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the R-S pseudo noise code consistent with the radiofrequency signal saltus step rule of transmitter transmission; In the initial synchronisation stage, conventional frequency hopping synchronizer is controlled periodic sequence that increases progressively (0,1 of receiver R-S sequencer output, M-1,0,1 ... M-1,0 ...), the sequential value hop rate is 100Hop/s, controlling and separating jumping NCO output one hop rate is the saltus step carrier wave of 100Hop/s;
If do not complete and catch after surpassing 6s sweep time, conventional frequency hopping synchronizer control receiver R-S sequencer stops scanning output, transfer output one fixed value to, control to separate and jump NCO output one fixed carrier (the receiver frequency range is fixed in certain frequency range), until complete, catch;
Subsequently, conventional frequency hopping synchronizer enters and receives pseudo noise code state information and TOD information state, by the time after synchronous end mark signal being detected, just control receiver R-S sequencer with the pseudo noise code state information that receives and TOD information and carry out the state renewal, and then the generation R-S pseudo noise code consistent with transmitter.
Iii, R-S pseudo noise code access solution are jumped NCO, control to separate and jump the NCO generation 2 road frequency-hopping carrier signals consistent with the radiofrequency signal saltus step rule of the transmission of transmitter, realize that conventional frequency hopping is synchronous, reach the final synchronous of system; Separate jumping the 2 road frequency-hopping carrier signals that NCO produces is that hop rate is the local carrier of the 2 road quadratures of 100Hop/s, the Q that obtains with step I respectively
1And I
1The signal mixing realizes separating conventional the jumping;
Iv, the 2 road signals of separating after routine is jumped carry out the orthogonal digital down-conversion through decimation filter respectively, interference signal outside low pass filter filters out is fallen band, and the differential jumping frequency signal that obtains Q road and I road quadrature is sent into receiver differential jumping frequency module;
Separate data transfer rate after conventional the jumping up to 76.8MSPS, and contain high fdrequency component, therefore need to jump signal and carry out filtering extraction separating.After decimation filter, signal sampling rate drops to 7.68MSPS by 76.8MSPS, then obtains the two-pass DINSAR Frequency Hopping Signal through low pass filter and send into the differential jumping frequency signal processing module;
V, jumping along under the control of synchronizer, the fast fourier transform module is determined the initial time (namely jumping along synchronous) of Frequency Hopping Signal, and calculates amplitude and the phase information of every jumping signal, sends into afterwards the carrier frequency identifier; Within a sweep time, jump along synchronizer and jump rapidly along adjusting.Because difference is jumped along synchronously only needing 13 to jump to complete and jump along synchronous, if therefore scan and transmit, one sweep time introskip can adjust rapidly along synchronizer until complete and jump along synchronous;
Vi, carrier frequency identifier rule out effective Frequency Hopping Signal according to amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering corresponding to the transmitter transmitted signal, then numbering is sent into viterbi decoder;
Vii, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, then are sent to the frequency hopping deframer;
Viii, frequency hopping deframer are completed the frame of tearing open to demodulating information, the frequency hopping deframer carries out coherent detection to the synchronizing information that comprises synchronous head, if synchronous head detected, just send command control receiver R-S sequencer and stop scanning output, and then control to separate and jump NCO output current carrier wave (resting on current frequency range), completed synchronous catching, and the synchronizing information that will demodulate (pseudo noise code state information and TOD information) feeds back to the frequency hopping synchronizer, and useful data message is sent to the information end user through data interface module.
Above-described embodiment, be only the specific case that purpose of the present invention, technical scheme and beneficial effect are further described, and the present invention not is defined in this.All any modifications of making, be equal to replacement, improvement etc., within all being included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (4)
1. the operation method of Synthesized Frequency Hopping wireless transceiver system, described Synthesized Frequency Hopping wireless transceiver system comprises the transmitter and receiver two large divisions, and described transmitter mainly comprises: the transmitter data interface that is linked in sequence, frequency hopping framer, transmitter differential jumping frequency module, the conventional frequency hopping module of transmitter, D/A converter and rf broadband front end emission circuit; Wherein transmitter differential jumping frequency module contains frequency sequence encoder, differential jumping frequency signal frequency control word memory, interpolation device and the differential jumping frequency digital controlled oscillator that connects successively; The conventional frequency hopping module of transmitter contains transmitter R-S sequencer, conventional frequency hopping band frequency control word memory, interpolation filter, transmitter frequency hopping digital controlled oscillator and subtracter; An output access frequency hopping framer of transmitter R-S sequencer, another output are through conventional frequency hopping band frequency control word memory access transmitter frequency hopping digital controlled oscillator, Q road and the I road signal of the output of differential jumping frequency digital controlled oscillator access respectively an interpolation filter, the two-way frequency-hopping carrier signal mixing that I road after the interpolation of 2 interpolation filters output and Q road differential jumping frequency signal produce with transmitter frequency hopping digital controlled oscillator respectively, obtain I
1Road and Q
1The road signal, access subtracter, gained Q
1Road signal and I
1Road signal poor, send into rf broadband front end emission circuit through the D/A converter;
Described receiver mainly comprises: the rf broadband front end receiving circuit that connects successively, A/D converter, the conventional frequency hopping module of receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI; Wherein the conventional frequency hopping module of receiver comprises solution jumping figure controlled oscillator, decimation filter, low pass filter, conventional frequency hopping synchronizer, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform module, frequency sequence decoder and jumping along synchronizer, and the frequency sequence decoder connects viterbi decoder by the carrier frequency identification module and forms; The output access frequency sequence decoder of fast fourier transform module and jumping, along synchronizer, are jumped along synchronizer feedback access fast fourier transform module; The conventional frequency hopping synchronizer of synchronizing information access of frequency hopping deframer output, the output of conventional frequency hopping synchronizer connects receiver R-S sequencer, the jumping figure controlled oscillator is separated in access again, and 2 tunnel carrier signals and the sampling of A/D converter high-speed data that solution jumping figure controlled oscillator sends obtain Q
1And I
1After the two paths of signals mixing respectively through decimation filter and low pass filter obtains the Q road and I road signal is sent into receiver differential jumping frequency module;
The conventional frequency hopping module of described transmitter, transmitter differential jumping frequency module, the conventional frequency hopping module of receiver and receiver differential jumping frequency module all adopt digital signal processor to realize;
The core of described digital signal processing module is field programmable gate array;
Whole shortwave frequency range is divided into M frequency sub-band, and every section bandwidth all equates, the saltus step between each section frequency band of conventional frequency hopping, saltus step in section of differential jumping frequency;
The concrete operating procedure that it is characterized in that the Frequency Hopping Signal that described transmitter generation is to be sent is as follows:
I, by data-interface, transmitter reads data message to be sent;
II, frequency hopping framer read the synchronizing information of R-S sequencer generation and the data message to be sent of data-interface simultaneously, carry out the framing design, and information is sent into the differential jumping frequency module and processed after framing;
Data after III, framing are sent into the frequency sequence encoder of differential jumping frequency module, information data after this frequency transfer function is with framing is carried out the differential coding mapping, or be referred to as frequency sequence coding, obtain the differential jumping frequency sequence information, use sequence number value as address again, access differential jumping frequency signal frequency control word memory, obtain sending into interpolation device after frequency control word;
IV, at interpolation device, the differential jumping frequency sequence is carried out interpolation processing, by frequency control word being carried out interpolation, process, its sample rate is promoted to differential jumping frequency digital controlled oscillator sample rate and mates;
Information after V, interpolation processing enters the differential jumping frequency digital controlled oscillator, the differential jumping frequency digital controlled oscillator reads differential jumping frequency signal frequency control word, output I, differential jumping frequency signal Q two-way quadrature and relevant to input data information, 1. I, Q two paths of signals represent with formula, f in formula
cFor the frequency of differential jumping frequency signal,
S
I(t)=cos(f
ct) S
Q(t)=sin(f
ct) ①
The interpolation filter that VI, I, Q two-pass DINSAR Frequency Hopping Signal enter respectively conventional frequency hopping module carries out interpolation, and its sample rate is increased to f
s, the output signal data rate of its data transfer rate and transmitter frequency hopping digital controlled oscillator is complementary;
VII, conventional R-S sequencer output pseudo random sequence, and use sequence number value as the conventional frequency hopping band frequency control word memory of address access;
VIII, transmitter frequency hopping digital controlled oscillator read conventional frequency hopping band frequency control word, and the hop rate that produces the two-way quadrature is R
fFrequency-hopping carrier,, with I road and the differential jumping frequency signal phase mixing of Q road after interpolation, obtain I respectively
1Road and Q
1The hop rate of road two-way quadrature is the conventional frequency-hopping carrier signal of 5Hop/s, 2. represents f in formula with formula
qFor the frequency of the selected frequency range of conventional frequency-hopping system,
S
I1(t)=cos(f
qt) S
Q1(t)=sin(f
qt) ②
IX, I
1Road and Q
1Road enters subtracter and obtains both poor, Q
1Road signal and I
1The difference of road signal by the D/A converter, send into rf broadband front end emission circuit, by antenna transmission; 3. transmitted signal represents with formula, f
cFor the frequency of differential jumping frequency signal, f
qFor the frequency of the selected frequency range of conventional frequency-hopping system,
S(t)=S
I(t)-S
Q(t)=cos(f
ct)*cos(f
qt)-sin(f
ct)*sin(f
qt)=cos[(f
c+f
q)t] ③
The solution that described receiver is completed is to received signal jumped, and the concrete operating procedure that restores data message is as follows:
The rf broadband front end receiving circuit of ⅰ, receiver, by the radiofrequency signal that radio-frequency antenna and its preposition radio frequency amplifier obtain, is sent into the A/D converter and is carried out the high-speed data sampling, obtains Q
1And I
1Two paths of signals;
The synchronizing information that ⅱ, conventional frequency hopping synchronizer demodulate according to the frequency hopping deframer, adjust local pseudo-code generator state information and clock information, synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the R-S pseudo noise code consistent with the radiofrequency signal saltus step rule of transmitter transmission;
The jumping figure controlled oscillator is separated in the access of ⅲ, R-S pseudo noise code, controls to separate the jumping figure controlled oscillator and produce the 2 road frequency-hopping carrier signals consistent with the radiofrequency signal saltus step rule of transmitter transmission the Q that obtains with step ⅰ respectively
1And I
1The signal mixing realizes separating conventional the jumping;
ⅳ, the 2 road signals of separating after routine is jumped carry out the orthogonal digital down-conversion through decimation filter respectively, interference signal outside low pass filter filters out is fallen band, and the differential jumping frequency signal that obtains Q road and I road quadrature is sent into receiver differential jumping frequency module;
ⅴ, jumping along under the control of synchronizer, the fast fourier transform module is determined the initial time of Frequency Hopping Signal, and calculates amplitude and the phase information of every jumping signal, sends into afterwards the carrier frequency identifier;
ⅵ, carrier frequency identifier rule out effective Frequency Hopping Signal according to amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering corresponding to the transmitter transmitted signal, then numbering is sent into viterbi decoder;
ⅶ, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, then are sent to the frequency hopping deframer;
ⅷ, frequency hopping deframer are completed the frame of tearing open to demodulating information, and synchronizing information is fed back to the frequency hopping synchronizer, and useful data message is sent to the information end user through data interface module.
2. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 1 is characterized in that:
Described operation method is divided into M frequency sub-band, the total bandwidth B of working frequency range at whole shortwave working frequency range
M〉=M * 2*[N * B
s+ B
h] determine, wherein N is the frequency number of differential jumping frequency in each frequency sub-band, B
sFor channel spacing, B
hFor transition band width; Frequency difference between any two conventional frequency hopping points is more than or equal to the differential jumping frequency bandwidth B of 2 times
c, namely | f
qi-f
qj| 〉=2B
cI, j=1,2...M, and f
qi2B
cI=1,2...M.
3. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 1 is characterized in that:
In described step II, after the frequency hopping framer reads the data message to be sent of synchronizing information that the R-S sequencer produces and data-interface simultaneously, be the initial synchronisation frame in the initial synchronisation stage design, at the duties synchronous phase, be designed to the duties Frame, complete the framing design.
4. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 1 is characterized in that:
Described step ⅱ, in the initial synchronisation stage, conventional frequency hopping synchronizer is controlled periodic sequence that increases progressively (0 of receiver R-S sequencer output, 1 ... M-1,0,1 ... M-1,0 ...), the sequential value hop rate is 100Hop/s, controlling and separating jumping figure controlled oscillator output one hop rate is the carrier wave of 100Hop/s; If do not complete and catch after surpassing 6s sweep time, conventional frequency hopping synchronizer is controlled receiver R-S sequencer and is stopped scanning output, transfers output one fixed value to, controls and separates jumping figure controlled oscillator output one fixed carrier, until complete, catches; Conventional frequency hopping synchronizer enters and receives pseudo noise code state information and TOD information state subsequently, by the time after synchronous end mark signal being detected, just control receiver R-S sequencer with the pseudo noise code state information that receives and TOD information and carry out the state renewal, and then the generation R-S pseudo noise code consistent with transmitter;
In described step ⅲ, the 2 road frequency-hopping carrier signals of separating the generation of jumping figure controlled oscillator are that hop rate is the local carrier of the 2 road quadratures of 100Hop/s;
In described step ⅴ, within a sweep time, jump along synchronizer and jump rapidly along adjusting, if scan, transmit, one sweep time introskip adjust along synchronizer until complete and jump along synchronously;
In described step ⅷ, the frequency hopping deframer carries out coherent detection to the synchronizing information that comprises synchronous head, if synchronous head detected, just send command control receiver R-S sequencer and stop scanning output, and then control the current carrier wave of solution jumping figure controlled oscillator output and so far just completed synchronous catching; After completing synchronization acquistion, the synchronizing information that the frequency hopping deframer will demodulate feeds back to conventional frequency hopping synchronizer.
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| CN102957451B (en) * | 2012-11-14 | 2014-08-13 | 东南大学 | Frequency-phase combined jumping communication method |
| CN105553908A (en) * | 2015-11-30 | 2016-05-04 | 杨荣 | Multicarrier system modulation method |
| CN105915265B (en) * | 2016-04-14 | 2018-10-26 | 电子科技大学 | A kind of distributed synchronising frequency hopping system hops sequence generating method |
| WO2018027704A1 (en) | 2016-08-10 | 2018-02-15 | 华为技术有限公司 | Time synchronization method and device |
| CN107544343B (en) * | 2017-09-26 | 2020-12-04 | 贵州航天天马机电科技有限公司 | Wireless communication frequency hopping controller |
| CN108521286B (en) * | 2018-03-13 | 2020-04-14 | 深圳飞思通科技有限公司 | Communication method for learning type self-adaptive 2.4G frequency band wireless frequency hopping |
| EP3591851B1 (en) * | 2018-07-02 | 2024-09-04 | Semtech Corporation | Relative frequency hops in low-power, wide-area network |
| CN112019234B (en) * | 2019-05-29 | 2022-08-16 | 鹤壁天海电子信息系统有限公司 | Data transmission method, transmitter and receiver |
| CN111585610B (en) * | 2020-03-25 | 2021-03-26 | 北京理工大学 | Digital filtering method and device for coherent fast frequency hopping signal |
| CN111585609B (en) * | 2020-03-25 | 2021-06-29 | 北京理工大学 | Miniaturized zero intermediate frequency fast frequency hopping radio station |
| CN111641420B (en) * | 2020-06-01 | 2021-06-15 | 北京升哲科技有限公司 | Signal detection and acquisition method, device, receiver and storage medium |
| CN113472389B (en) * | 2021-06-30 | 2022-04-01 | 中航光电科技股份有限公司 | Low-delay configurable wireless rapid frequency hopping system based on FPGA |
| CN118174749A (en) * | 2024-04-11 | 2024-06-11 | 电子科技大学 | Time-hopping frequency-hopping modulator |
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