CN102355281A - 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 the Synthesized Frequency Hopping wireless transceiver system and the operation method thereof of high-speed radio frequency hopping communications through hybrid mode.
(2) background technology
Be different from the traditional conventional frequency hopping; Differential jumping frequency (DFH; Differential Frequency Hopping) technology has been represented modern frequency hopping communications latest development; Even on the shortwave frequency range, 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); 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 the DFH communication system, coding, modulation and frequency hopping adopt the integrated implementation of Trellis-coded modulation (TCM, Trellis Coded Modulation).Transmitting terminal, information data are that frequency hop sequences control digital controlled oscillator (DDS, Direct Digital Synthesizer) produces corresponding frequency-hopping carrier through the G Function Mapping through after the chnnel coding again; 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, demodulates the data message of transmission again according to the good rule of predefined through the frequency sequence decoding module.
Frequency-hopping system be if can realize real-time full frequency band frequency hopping, to the lifting of the antijamming capability of system with of great advantage.But owing to receive the restriction of the software and hardware resources of digital signal processing unit, the differential jumping frequency mode is difficult to realize the wider frequency 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 the shortwave full frequency band
s>=60Msps.If directly with so high speed sampling, signal processing such as its follow-up fast fourier transform (FFT, Fast Fourier Transformation) data operation will extremely difficultly realize.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 appearance signal of given pace, again this signal is carried out fast fourier transform (FFT, Fast Fourier Transformation) subsequently and handle.This method has effectively been alleviated fast fourier transform (FFT; Fast Fourier Transformation) realization difficulty; Reduced the requirement of signal processing to hardware; But but significantly reduced frequency hopping scope (being generally about 2MHz), also greatly reduced the ability of anti-interference and anti-investigation.
In addition, DFH communication system quadrature networking performance is relatively poor.For single user's communications, DFH communication system can provide the higher data transfer rate, owing to do not exist alien frequencies to disturb, its reliability is also very high.When in the 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 exist the alien frequencies between subnet to disturb, then the place one's entire reliance upon error correction capability of system of the performance of DFH communication system itself is subjected to restrict with the relevant encoding characteristics of maximum likelihood frequency sequence detection.If improve the error correction capability of system, the complexity of realization is with corresponding improve.
The R-S sequence has good orthogonality, when synchronous network, can realize " collisionless " networking, and performance is also very good when asynchronous networking, if conventional frequency hop sequences adopts the R-S sign indicating number, system can be prone to realize the quadrature networking.But the attainable jumping speed 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 through conventional frequency hopping and differential jumping frequency, and the full frequency band frequency hopping generates Frequency Hopping Signal to be sent in real time; Receiving terminal is accomplished the jumping of separating to received signal in reverse order, 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 then 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 of transmitter R-S sequencer inserts the frequency hopping framer, another output inserts transmitter frequency hopping NCO through conventional frequency hopping band frequency control word memory; The Q road and the I road signal of differential jumping frequency NCO output insert an interpolation filter respectively; I road after interior the inserting of 2 interpolation filters output and Q road differential jumping frequency signal respectively with the two-way frequency-hopping carrier signal mixing of transmitter frequency hopping NCO generation, obtain I
1Road and Q
1The road signal inserts subtracter.Gained Q
1Road signal and I
1Road signal poor sent into rf broadband front end emission circuit through the D/A converter.
Receiver mainly comprises: the conventional frequency hopping module of the rf broadband front end receiving circuit of Lian Jieing (RF front-end wideband receiving circuit), A/D converter (A-D converter), receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI successively.Wherein the conventional frequency hopping module of receiver comprises and separates jumping figure controlled oscillator (separate and jump NCO), decimation filter, low pass filter, conventional frequency hopping synchronization device, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform (FFT Fast Fourier Transformation) module (FFT module), frequency sequence decoder and jumps along synchronizer that the frequency sequence decoder connects viterbi decoder by the carrier frequency identifier and forms.The output of FFT module inserts the frequency sequence decoder and jumps along synchronizer, jumps along the synchronizer feedback and inserts the FFT module.The synchronizing information of frequency hopping deframer output inserts conventional frequency hopping synchronization device, and the output of conventional frequency hopping synchronization device connects receiver R-S sequencer, inserts to separate again and jumps NCO, separates to jump 2 tunnel carrier signals that NCO sends and sample with A/D converter high-speed data and 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 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, then 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 following:
I, through 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, and information is sent into the differential jumping frequency module and handled behind framing;
Information data behind III, the 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; Again with sequence number value as the address; Visit differential jumping frequency signal frequency control word memory ROM obtains sending into interpolation device after the differential jumping frequency signal frequency control word;
IV, the differential jumping frequency sequence is carried out interpolation processing, handle, its sample rate is promoted to differential jumping frequency NCO sample rate mates through inserting in frequency control word is carried out at interpolation device;
Information after V, the interpolation processing gets into differential jumping frequency NCO, and differential jumping frequency NCO reads differential jumping frequency signal frequency control word, output I, Q two-way quadrature and relevant with input data information differential jumping frequency signal, and 1. I, Q two paths of signals are represented with formula, f in the 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-way differential jumping frequency signal get into the conventional frequency hopping module of transmitter respectively carries out interior inserting, 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 with sequence number value as the conventional frequency hopping band frequency of accessed control word memory ROM1, obtain sending into transmitter frequency hopping NCO behind the 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 mixing mutually of Q road differential jumping frequency signal after interior insert, 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. representes f in the 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
1The road gets into subtracter and obtains the poor of the two, Q
1Road signal and I
1The difference of road signal through the D/A converter, send into rf broadband front end emission circuit, launch by antenna.Send signal and can 3. represent f with formula
cBe 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 the said 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; In the initial synchronisation stage design is the initial synchronisation frame, is designed to the duties Frame at the duties synchronous phase, accomplishes the framing design.
Receiver is accomplished the jumping of separating to received signal, and the concrete operating procedure that restores data message is following:
The rf broadband front end receiving circuit of i, receiver is sent into the A/D converter and is carried out the high-speed data sampling through the radiofrequency signal that radio-frequency antenna and its preposition radio frequency (RF) amplifier obtain, and obtains Q
1And I
1Two paths of signals;
The synchronizing information that ii, conventional frequency hopping synchronization device demodulate according to the frequency hopping deframer; Pseudo-code generator state information and clock information (TOD information that adjustment is local; Time of the Day); Synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the consistent R-S pseudo noise code of radiofrequency signal saltus step rule of sending with transmitter;
Iii, receiver R-S sequencer insert and separate jumping figure controlled oscillator (separate and jump NCO), and control is separated and jumped NCO and produce the 2 road consistent frequency-hopping carrier signals of radiofrequency signal saltus step rule with the transmission of transmitter, respectively the Q that obtains with step I
1And I
1Signal mixing realizes separating conventional the jumping;
Iv, 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 confirmed the initial moment (promptly jumping along synchronously) of Frequency Hopping Signal, and calculates the amplitude and the phase information of every jumping signal, sends into the carrier frequency identifier afterwards
Vi, carrier frequency identifier rule out effective Frequency Hopping Signal according to the amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering of sending signal corresponding to transmitter, again numbering are sent into viterbi decoder;
Vii, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, are sent to the frequency hopping deframer again;
Viii, frequency hopping deframer accomplish 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 synchronization device, and useful data message then is sent to the information end user through data-interface.
Said step I i, in the initial synchronisation stage, periodic sequence that increases progressively of conventional frequency hopping synchronization device receiver control R-S sequencer output (0,1 ... M-1,0,1 ... M-1,0 ...), the sequential value hop rate is 100Hop/s.
Among the said step I i; After surpassing 6s sweep time, do not catch if accomplish; Then conventional frequency hopping synchronization device receiver control R-S sequencer stops scanning output; Transfer output one fixed value to; Control is separated jumping NCO and is exported a fixed carrier (the receiver frequency range is fixed in certain frequency range), till completion is caught.Subsequently; Conventional frequency hopping synchronization device gets into and receives pseudo noise code state information and TOD information state; By the time after detecting synchronous end mark signal; Just carry out state with pseudo noise code state information that receives and TOD information Control receiver R-S sequencer and upgrade, and then the generation R-S pseudo noise code consistent with transmitter.
Among the said step I ii, separating 2 road frequency-hopping carrier signals of jumping the NCO generation is that hop rate is the local carrier of 2 road quadratures of 100Hop/s, and control is separated the jumping figure controlled oscillator and exported the carrier wave that a hop rate is 100Hop/s.
Among the said step v, in a sweep time, jump along synchronizer and jump rapidly along adjustment.Because difference is jumped along only needing 13 to jump to accomplish and jump along synchronously synchronously, transmit if therefore scan, one sweep time introskip can adjust rapidly until accomplishing along synchronizer and jump along synchronously.
Among the said step viii; The frequency hopping deframer carries out coherent detection to the synchronizing information that comprises synchronous head; If detect synchronous head; Just send command control receiver R-S sequencer and stop scanning output; And then control separates and jumps NCO and export current carrier wave (resting on current frequency range), so far just accomplished synchronous catching.
Among the said step viii, after the completion synchronization acquistion, the frequency hopping deframer feeds back to conventional frequency hopping synchronization device with the synchronizing information (pseudo noise code state information and TOD information) that demodulates.
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] decision, wherein M is the frequency range number of conventional frequency hopping, N is the frequency number of differential jumping frequency in each frequency range, B
sBe channel spacing, B
hBe transition band width.
Value to M, N will comprehensively be weighed.When getting M=1, then this system is exactly simple DFH communication system.The M value is big more, and conventional frequency hopping frequency range number is many more, and multiple access performance is then good more, is beneficial to the quadrature networking of system, can further increase but conventional frequency hopping synchronization realizes difficulty.The N value of corresponding differential jumping frequency is more little, and the differential jumping frequency hardware resource consumption is then more little.But differential jumping frequency frequency number is very few, and free distance then can be more little, and the error correcting capability of system is poor more, 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 the segmentation between any two conventional frequency hopping points is more than or equal to 2 times differential jumping frequency bandwidth B
c, promptly | f
Qi-f
Qj|>=2B
cI, j=1,2..M, and f
Qi＞2B
cI=1,2..M.Guarantee when the receiver frequency range is consistent with the transmitter frequency range, after mixing and filtering, only to keep useful signal.
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, make full use of the advantage separately of dual mode and the cascade characteristics of two kinds of structures; The back level adopts the differential jumping frequency mode, has kept advantages such as 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 under multi-user's situation; This frequency-hopping system can be implemented in large-spacing saltus step between the frequency range; Also just realize the full frequency band frequency hopping; Can extend to whole shortwave frequency range to the frequency hopping bandwidth thus; Has wideer frequency hopping bandwidth; Greatly enriched frequency hopping frequency number; Improved the 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, reduced the requirement of differential jumping frequency, also reduced the difficulty of hardware cost and realization hardware size and technology; 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 has guaranteed the flexibility in the design; For example, can reduce back level difference frequency hopping 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, when synchronous network, can realize " collisionless " networking, and performance is also very good when asynchronous networking; Prime adopts the R-S sign indicating number as pseudo noise code, and frequency-hopping system can be realized the quadrature networking; 5, the fast cascade of low jumping of the high jump sepeed of differential jumping frequency and conventional frequency hopping more helps the realization of system synchronization; Conventional frequency hopping rate is lower, can in a conventional time of jumping, transmit all synchronizing informations, is prone to realize frequency hopping synchronization.
(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
The transmitter of this Synthesized Frequency Hopping wireless transceiver system embodiment as shown in Figure 1, receiver is as shown in Figure 2.
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 then contains transmitter R-S sequencer, interpolation filter, transmitter frequency hopping digital controlled oscillator (transmitter frequency hopping NCO) and subtracter.An output of transmitter R-S sequencer inserts the frequency hopping framer, another output inserts transmitter frequency hopping NCO through conventional frequency hopping band frequency control word memory; The Q road and the I road signal of differential jumping frequency NCO output insert an interpolation filter respectively; I road after interior the inserting of 2 interpolation filters output and Q road differential jumping frequency signal respectively with the two-way frequency-hopping carrier signal mixing of transmitter frequency hopping NCO generation, obtain I
1Road and Q
1The road signal inserts subtracter.Gained Q
1Road signal and I
1Road signal poor sent into rf broadband front end emission circuit through the D/A converter.
Receiver mainly comprises: the conventional frequency hopping module of the low noise rf broadband front end receiving circuit of Lian Jieing (low noise RF wideband frontend receiving circuit), A/D converter, receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI successively.Wherein the conventional frequency hopping module of receiver comprises separating and jumps NCO, decimation filter, low pass filter, conventional frequency hopping synchronization device, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform (FFT Fast Fourier Transformation) module, frequency sequence decoder and jumps along synchronizer that the frequency sequence decoder connects viterbi decoder by the carrier frequency identifier and forms.The output of FFT module inserts the frequency sequence decoder and jumps along synchronizer, jumps along the synchronizer feedback and inserts the FFT module.The synchronizing information of frequency hopping deframer output inserts conventional frequency hopping synchronization device, and the output of conventional frequency hopping synchronization device connects receiver R-S sequencer, inserts to separate again and jumps NCO, separates to jump 2 tunnel carrier signals that NCO sends and sample with A/D converter high-speed data and 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 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
Differential jumping frequency is counted in each frequency sub-band: N=32
The total frequency hopping of system is counted: N
1=32*8=256
Radio frequency sampling rate: f
s=76.8MSPS
If sampling rate: f
S1=7.68MSPS
Fan-out 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, promptly
| 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 following:
I, through 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; In the initial synchronisation stage design is the initial synchronisation frame; Be designed to the duties Frame at the duties synchronous phase, accomplish 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 data transfer rate is 2500bit/s behind the framing, and information is sent into the differential jumping frequency module and handled behind framing.
The frequency sequence encoder of sending into the differential jumping frequency module behind III, the 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; Again with sequence number value as the address, visit differential jumping frequency signal frequency control word memory ROM obtains sending into interpolation device behind the frequency control word; The frequency control word sample rate is 2500SPS, and the difference hop rate is 2500Hop/s.
IV, the differential jumping frequency sequence is carried out interpolation processing, handle, its sample rate is promoted to differential jumping frequency NCO sample rate mates through inserting in frequency control word is carried out at interpolation device.
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 carry out inserting in 3072 times to frequency control word and handle; Interpolation device is used to accomplish this function, handles through frequency control word being carried out insert in 3072 times, and its sample rate is promoted to 7.68MSPS by 2500SPS, mates with differential jumping frequency NCO sample rate.
Information after V, the interpolation processing gets into differential jumping frequency NCO, and differential jumping frequency NCO reads differential jumping frequency signal frequency control word, output I, Q two-way quadrature and relevant with input data information differential jumping frequency signal, and 1. I, Q two paths of signals are represented with formula, f in the 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-way differential jumping frequency signal get into conventional frequency hopping module respectively carries out interior inserting, 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 rates coupling, needs the differential jumping frequency signal is carried out 10 times of up-samplings.Interpolation filter just is used to accomplish this function, through the differential jumping frequency signal being carried out 10 times interior slotting processing, its sample rate is promoted to 76.8MSPS from 7.68MSPS.
VII, transmitter R-S sequencer output pseudo random sequence, and with sequence number value as the conventional frequency hopping band frequency of accessed control word memory ROM1, 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 mixing mutually of Q road differential jumping frequency signal after interior insert, 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. representes f in the 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
1The road gets into subtracter and obtains the poor of the two, Q
1Road signal and I
1The difference of road signal through the D/A converter, send into rf broadband front end emission circuit, launch by antenna.Send signal and can 3. represent f with formula
cBe 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
This routine receiver is accomplished the jumping of separating to received signal, and the concrete operating procedure that restores data message is following:
The rf broadband front end receiving circuit of i, receiver is sent into the A/D converter and is carried out the high-speed data sampling through the radiofrequency signal that radio-frequency antenna and its preposition radio frequency (RF) amplifier obtain, and obtains Q
1And I
1Two paths of signals;
The synchronizing information that ii, conventional frequency hopping synchronization device demodulate according to the frequency hopping deframer; Pseudo-code generator state information and clock information that adjustment is local; Synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the consistent R-S pseudo noise code of radiofrequency signal saltus step rule of sending with transmitter; In the initial synchronisation stage, periodic sequence that increases progressively (0,1 of conventional frequency hopping synchronization device receiver control R-S sequencer output; M-1,0,1 ... M-1; 0 ...), the sequential value hop rate is 100Hop/s, control is separated jumping NCO and is exported the saltus step carrier wave that a hop rate is 100Hop/s;
After surpassing 6s sweep time, do not catch if accomplish; Then conventional frequency hopping synchronization device receiver control R-S sequencer stops scanning output; Transfer output one fixed value to, control is separated jumping NCO and is exported a fixed carrier (the receiver frequency range is fixed in certain frequency range), till completion is caught;
Subsequently; Conventional frequency hopping synchronization device gets into and receives pseudo noise code state information and TOD information state; By the time after detecting synchronous end mark signal; Just carry out state with pseudo noise code state information that receives and TOD information Control receiver R-S sequencer and upgrade, and then the generation R-S pseudo noise code consistent with transmitter.
Iii, R-S pseudo noise code insert to separate and jump NCO, and control is separated and jumped NCO and produce the 2 road consistent frequency-hopping carrier signals of radiofrequency signal saltus step rule with the transmission of transmitter, realizes conventional frequency hopping synchronization, reaches the finally synchronous of system; Separating and jumping 2 road frequency-hopping carrier signals that NCO produces is that hop rate is the local carrier of 2 road quadratures of 100Hop/s, respectively the Q that obtains with step I
1And I
1Signal mixing realizes separating conventional the jumping;
Iv, 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 jump signal and carry out filtering extraction separating.Behind decimation filter, signal sampling rate drops to 7.68MSPS by 76.8MSPS, obtains two-way differential jumping frequency signal through low pass filter again and sends into the differential jumping frequency signal processing module;
V, jumping along under the control of synchronizer, the fast fourier transform module is confirmed the initial moment (promptly jumping along synchronously) of Frequency Hopping Signal, and calculates the amplitude and the phase information of every jumping signal, sends into the carrier frequency identifier afterwards; In a sweep time, jump along synchronizer and jump rapidly along adjustment.Because difference is jumped along only needing 13 to jump to accomplish and jump along synchronously synchronously, transmit if therefore scan, one sweep time introskip can adjust rapidly until accomplishing along synchronizer and jump along synchronously;
Vi, carrier frequency identifier rule out effective Frequency Hopping Signal according to the amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering of sending signal corresponding to transmitter, again numbering are sent into viterbi decoder;
Vii, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, are sent to the frequency hopping deframer again;
Viii, frequency hopping deframer are accomplished 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 detect synchronous head; Just send command control receiver R-S sequencer and stop scanning output; And then control is separated and is jumped NCO and export current carrier wave (resting on current frequency range); Accomplished synchronous catching; And the synchronizing information (pseudo noise code state information and TOD information) that demodulates fed back to the frequency hopping synchronization device, useful data message then is sent to the information end user through data interface module.
The foregoing description only is a concrete example to the object of the invention, technical scheme and beneficial effect further explain, and the present invention is defined in this.All any modifications of within scope of disclosure of the present invention, being made, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (8)
1. the Synthesized Frequency Hopping wireless transceiver system comprises the transmitter and receiver two large divisions, it is characterized in that:
Said 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 then 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 of transmitter R-S sequencer inserts the frequency hopping framer, another output inserts transmitter frequency hopping digital controlled oscillator through conventional frequency hopping band frequency control word memory; The Q road and the I road signal of the output of differential jumping frequency digital controlled oscillator insert an interpolation filter respectively; I road after interior the inserting of 2 interpolation filters output and Q road differential jumping frequency signal respectively with the two-way frequency-hopping carrier signal mixing of transmitter frequency hopping digital controlled oscillator generation, obtain I
1Road and Q
1The road signal inserts subtracter, gained Q
1Road signal and I
1Road signal poor sent into rf broadband front end emission circuit through the D/A converter;
Said receiver mainly comprises: the conventional frequency hopping module of the rf broadband front end receiving circuit of Lian Jieing, A/D converter, receiver, receiver differential jumping frequency module, frequency hopping deframer and RDI successively; Wherein the conventional frequency hopping module of receiver comprises and separates jumping figure controlled oscillator, decimation filter, low pass filter, conventional frequency hopping synchronization device, receiver R-S sequencer; Receiver differential jumping frequency module comprises fast fourier transform module, frequency sequence decoder and jumps along synchronizer that the frequency sequence decoder connects viterbi decoder by the carrier frequency identification module and forms; The output of fast fourier transform module inserts the frequency sequence decoder and jumps along synchronizer, jumps along the synchronizer feedback and inserts the fast fourier transform module; The synchronizing information of frequency hopping deframer output inserts conventional frequency hopping synchronization device; The output of conventional frequency hopping synchronization device connects receiver R-S sequencer; Insert again and separate the jumping figure controlled oscillator, separate 2 tunnel carrier signals that the jumping figure controlled oscillator sends and sample with A/D converter high-speed data and 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.
2. Synthesized Frequency Hopping wireless transceiver system according to claim 1 is characterized in that:
The conventional frequency hopping module of said 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.
3. Synthesized Frequency Hopping wireless transceiver system according to claim 2 is characterized in that:
The core of said digital signal processing module is a field programmable gate array.
4. according to the operation method of each described Synthesized Frequency Hopping wireless transceiver system in the claim 1 to 3, it is characterized in that:
Whole shortwave frequency range is divided into the M sub-band, and every section bandwidth all equates the saltus step between each section frequency band of conventional frequency hopping, then saltus step in section of differential jumping frequency.
5. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 4 is characterized in that:
The concrete operating procedure of the Frequency Hopping Signal that said transmitter generation is to be sent is following:
I, through 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 handled behind framing;
Data behind III, the 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; Again with sequence number value as the address; Visit differential jumping frequency signal frequency control word memory obtains sending into interpolation device behind the frequency control word;
IV, the differential jumping frequency sequence is carried out interpolation processing, handle, its sample rate is promoted to differential jumping frequency digital controlled oscillator sample rate mates through inserting in frequency control word is carried out at interpolation device;
Information after V, the interpolation processing gets into the differential jumping frequency digital controlled oscillator; The differential jumping frequency digital controlled oscillator reads differential jumping frequency signal frequency control word; Output I, Q two-way quadrature and relevant with input data information differential jumping frequency signal, 1. I, Q two paths of signals are represented with formula, f in the formula
cBe 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-way differential jumping frequency signal get into conventional frequency hopping module respectively carries out interior inserting, 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 with sequence number value as the conventional frequency hopping band frequency of accessed control word memory;
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 mixing mutually of Q road differential jumping frequency signal after interior insert, 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. representes f in the formula with formula
qBe 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
1The road gets into subtracter and obtains the poor of the two, Q
1Road signal and I
1The difference of road signal through the D/A converter, send into rf broadband front end emission circuit, launch by antenna; Send signal and 3. represent f with formula
cBe the frequency of differential jumping frequency signal, f
qBe 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
Said receiver is accomplished the jumping of separating to received signal, and the concrete operating procedure that restores data message is following:
The rf broadband front end receiving circuit of i, receiver is sent into the A/D converter and is carried out the high-speed data sampling through the radiofrequency signal that radio-frequency antenna and its preposition radio frequency amplifier obtain, and obtains Q
1And I
1Two paths of signals;
The synchronizing information that ii, conventional frequency hopping synchronization device demodulate based on the frequency hopping deframer; Pseudo-code generator status information and clock information that adjustment is local; Synchronizing information is sent into receiver R-S sequencer, make receiver R-S sequencer generate the consistent R-S pseudo noise code of radiofrequency signal saltus step rule of sending with emitter;
Iii, R-S pseudo noise code insert and separate the jumping figure controlled oscillator, and control is separated the jumping figure controlled oscillator and produced the 2 road consistent frequency-hopping carrier signals of radiofrequency signal saltus step rule with the transmitter transmission, respectively the Q that obtains with step I
1And I
1Signal mixing realizes separating conventional the jumping;
Iv, 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 confirmed the initial moment of Frequency Hopping Signal, and calculates the amplitude and the phase information of every jumping signal, sends into the carrier frequency identifier afterwards;
Vi, carrier frequency identifier rule out effective Frequency Hopping Signal according to the amplitude information and the phase information of every jumping signal that the FFT module calculates, and are converted into the frequency sequence numbering of sending signal corresponding to transmitter, again numbering are sent into viterbi decoder;
Vii, viterbi decoder are numbered according to frequency sequence, restore corresponding receiving data information, are sent to the frequency hopping deframer again;
Viii, frequency hopping deframer are accomplished the frame of tearing open to demodulating information, and synchronizing information is fed back to the frequency hopping synchronization device, and useful data message then is sent to the information end user through data interface module.
6. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 5 is characterized in that:
Said operation method is divided into the M sub-band at whole shortwave working frequency range, the total bandwidth B of working frequency range
w>=M * 2*[N * B
s+ B
h] decision, wherein N is the frequency number of differential jumping frequency in each frequency sub-band, B
sBe channel spacing, B
hBe transition band width; Frequency difference between any two conventional frequency hopping points is more than or equal to 2 times differential jumping frequency bandwidth B
c, promptly | f
Qi-f
Qj|>=2B
cI, j=1,2..M, and f
Qi＞2B
cI=1,2..M.
7. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 5 is characterized in that:
In the said 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; In the initial synchronisation stage design is the initial synchronisation frame, is designed to the duties Frame at the duties synchronous phase, accomplishes the framing design.
8. the operation method of Synthesized Frequency Hopping wireless transceiver system according to claim 5 is characterized in that:
Said step I i; In the initial synchronisation stage; Periodic sequence that increases progressively (0 of conventional frequency hopping synchronization device receiver control R-S sequencer output; 1 ... M-1,0; 1 ... M-1; 0 ...), the sequential value hop rate is 100Hop/s, control is separated the jumping figure controlled oscillator and is exported the carrier wave that a hop rate is 100Hop/s; If completion is not caught, conventional frequency hopping synchronization device receiver control R-S sequencer stops scanning output after surpassing 6s sweep time, transfers output one fixed value to, and control is separated the jumping figure controlled oscillator and exported a fixed carrier, till completion is caught; Conventional subsequently frequency hopping synchronization device gets into and receives pseudo noise code state information and TOD information state; By the time after detecting synchronous end mark signal; Just carry out state with pseudo noise code state information that receives and TOD information Control receiver R-S sequencer and upgrade, and then the generation R-S pseudo noise code consistent with transmitter;
Among the said step I ii, 2 road frequency-hopping carrier signals of separating the generation of jumping figure controlled oscillator are that hop rate is the local carrier of 2 road quadratures of 100Hop/s;
Among the said step v, in a sweep time, jump along synchronizer and jump rapidly, transmit if scan along adjustment, one sweep time introskip adjust until accomplishing along synchronizer and jump along synchronously;
Among the said step viii; The frequency hopping deframer carries out coherent detection to the synchronizing information that comprises synchronous head; If detect synchronous head; Just send command control receiver R-S sequencer and stop scanning output, and then control is separated the jumping figure controlled oscillator and exported current carrier wave and so far just accomplished synchronous catching; After accomplishing synchronization acquistion, the frequency hopping deframer feeds back to conventional frequency hopping synchronization device with the synchronizing information that demodulates.
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