CN107204948B - A kind of frequency deviation compensation system under the fast frequency-hopped system in broadband - Google Patents

A kind of frequency deviation compensation system under the fast frequency-hopped system in broadband Download PDF

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CN107204948B
CN107204948B CN201710339931.8A CN201710339931A CN107204948B CN 107204948 B CN107204948 B CN 107204948B CN 201710339931 A CN201710339931 A CN 201710339931A CN 107204948 B CN107204948 B CN 107204948B
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frequency
unit
frequency deviation
jump
fcw
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CN107204948A (en
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赵伟
翟盛华
李加洪
侴胜男
李雄飞
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Xian Institute of Space Radio Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7156—Arrangements for sequence synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0605—Special codes used as synchronising signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

Abstract

The present invention relates to the frequency deviation compensation systems under a kind of fast frequency-hopped system in broadband, including radio frequency solution to jump unit, matched filter, time synchronization unit, frequency offset correction unit, phase correction block, frequency-hopping synchronization unit etc.；This patent has studied the frequency deviation relationship of frequency-hopping system difference jump, by the unique code for designing long and short two kinds of different lengths, offset estimation is carried out using the long unique code that pilot tone is jumped, line frequency offset compensation is respectively jumped into remaining in addition to guiding and jumping according to the frequency relation of different jumps, carrier synchronization is completed, this makes it possible broadband High-speed frequency hopping communication system using coherent demodulation mode.This is by the noiseproof feature for the system that improves, also, this method can adapt to great frequency deviation region.

Description

A kind of frequency deviation compensation system under the fast frequency-hopped system in broadband
Technical field
The present invention relates to the frequency deviation compensation systems under a kind of fast frequency-hopped system in broadband, belong to field of communication technology.
Background technique
There are the following problems for the demodulation of the phase modulated signal under frequency hopping system in the prior art:
(1), phase modulated signal uses noncoherent modulation demodulation system in usual frequency-hopping system, however in order of modulation Under the same conditions, the noiseproof feature of non-coherent modulation demodulating system is less than coherent modulation/demodulation system.
(2), the Coherent Demodulation phaselocked loop needs based on phaselocked loop are longer enters to lock the time, especially under big frequency deviation It is even more so, this make the Coherent Demodulation based on phaselocked loop can not be suitable for high-speed frequency hopping system (i.e. every jump symbolic number compared with Few frequency-hopping system), and large-scale frequency deviation is not adapted to.
(3), traditional open-loop carrier method of synchronization needs higher frequency estimation accuracy, this just needs to lengthen for frequency deviation The pilot tone unique code of estimation.However, the frequency deviation difference for wide interval frequency hopping system, between the biggish two frequency bins of frequency interval Larger, this is just needed in every frequency deviation jumped setting length spy code and go to estimate the jump, this will lead in a jump shared by useful information Symbolic number is reduced, and has seriously affected communication efficiency.
According to above-mentioned analysis, the coherent demodulation under the fast frequency-hopped system in broadband is extremely difficult.
Summary of the invention
It is an object of the invention to: overcome the deficiencies of the prior art and provide a kind of frequency deviation compensation system based on frequency offset calculation System, the carrier synchronization under the quick frequency hopping system of broadband can be completed using this system while not influencing communication efficiency, and This method is adapted to very big frequency deviation region.
The technical scheme is that the frequency deviation compensation system under a kind of fast frequency-hopped system in broadband, including radio frequency solution are jumped Unit, frequency-hopping synchronization unit, matched filter, time synchronization unit, frequency offset correction unit, phase correction block；
Radio frequency solution jumps unit: obtaining system by the linear transformation to Direct Digital Frequency Synthesizers (DDS) output frequency The output signal frequency needed, the transformation relation indicate that the frequency control word by changing DDS generates and receives signal frequency with f` The identical solution of rate jumps local oscillator, which is provided by frequency-hopping synchronization unit；Local oscillator is jumped to reception finally by obtained solution Signal carries out quadrature frequency conversion and analog-to-digital conversion, obtains determining frequency zero intermediate frequency digital signal；
Frequency-hopping synchronization and frame synchronization unit: after system completes frequency-hopping synchronization and frame synchronization, hop counter is with the jump of a frame Number M is the period, carries out the counting as unit of jumping, count value 0,1 ... M-1；According to frequency hopping pattern, the frequency control of every jump is generated Word Fcw processed0, Fcw1…FcwM-1；M is positive integer；
Matched filter and time synchronization unit: matched filter is completed to determine frequency zero intermediate frequency digital signal to solution jump output Carry out matched filtering, filtering output result is sent into time synchronization unit and is timed recovery operation, final output signal it is best Sampled point；
Frequency offset correction unit: including frequency deviation estimating unit, compensating for frequency offset computing unit, frequency compensation unit；Offset estimation Unit jumps into row offset estimation to the guidance for receiving signal, and frequency offset calculation unit calculates each frequency for jumping signal in a frame Partially, frequency offset compensation element is completed to each frequency offset correction for jumping signal；
Phase correction block: the skew for correcting frequency offset correction element output signal.
The structure of the frame altogether by M jump constitute, every jumps has N number of symbol, wherein first jump by length be N1 unique code with The data that length is N-N1 are constituted, and the data that the unique code and length that remaining jump is N2 by length are N-N2 form, wherein N1 > N2。
F (the Fcwi) calculation method are as follows:
Wherein, T is the frequency multiplication multiple of frequency multiplier, and W is the bit wide of DDS, and Lo1, Lo2 respectively indicate frequency mixer local oscillator and DDS Multiple of this frame compared to local reference clock F.
In the frequency deviation estimating unit, when frequency hopping count value is 0, frequency deviation estimating unit work, using auxiliary based on data The frequency excursion algorithm helped, the unique code for being N1 by length in this jump carry out offset estimation, obtain the benchmark frequency deviation of this frame fd0。
The course of work of the compensating for frequency offset computing unit is as follows:
Firstly, the frequency control word Fcw generated according to frequency-hopping synchronization unit0, Fcw1…FcwM-1And channel linear frequency conversion Relationship f calculates f (Fcw0), f (Fcw1)…f(FcwM-1)；Wherein f (Fcwi) it is the frequency control for controlling frequency hopping DDS frequency hopping The function of word, i=1,2...M-1；
Secondly, the benchmark frequency deviation estimated according to frequency deviation estimating unit, calculates and obtains frequency deviation parameterIts Middle Fcw0The frequency-hopping synchronization frequency control word jumped for first,
Finally, jumping corresponding frequency-hopping synchronization frequency control word according to different in this frame, the frequency deviation value f of each jump is calculateddi =f (Fcwi)*D。
The frequency offset compensation element includes data buffer unit, frequency deviation buffer cell and frequency deviation compensation multiplier composition；Number It is cached according to the complex data that buffer cell exports front-end module, and these data is divided into M group as unit of jumping；Frequency deviation The frequency deviation f for every jump that buffer cell calculates front-end modulediIt is cached, and generates twiddle factorFrequency deviation compensation Multiplier is gone to correct the data accordingly jumped with the frequency deviation of different jumps, obtains each hop count evidence of no frequency deviation:
Wherein, i=0,1...M-1；K=0,1...N-1；Ii(k)+j*QiIt (k) is the defeated of front end time synchronization unit output The optimum sampling point of signal out；K=0,1...N-1.
The course of work of the phase correction block are as follows:
Firstly, to the unique code of each jump signal received and local unique code carry out related operation (first jump it is related Length is N1, remaining correlation length jumped is N2), obtaining correlation is CorIi+j*CorQi, i=0,1,2...M-1, CorIi Represent the real part of correlation, CorQiRepresent the imaginary part of correlation；Secondly, calculating the phase of the correlativei=artan (CorQi/CorIi), i=0,1...M-1；Finally, phasing is carried out to the signal after correcting frequency offset, after obtaining frequency deviation compensation Signal constellation point:
Wherein, i=0,1...M-1；K=0,1...N-1.
Compared with prior art, the present invention has the following advantages:
(1) the invention enables the coherent demodulations of the fast frequency-hopped lower phase-modulation in broadband to be possibly realized, and more common is incoherent Demodulating algorithm improves noiseproof feature.
(2) method that the present invention uses offset estimation combination frequency offset calculation, does not have while improving frequency estimation accuracy Pilot-frequency expense is obviously increased, the communication efficiency of quick frequency hopping system is improved.
(3) present invention estimates the benchmark frequency deviation of this frame signal to the pilot tone unique code jumped using pilot tone, utilizes different jumps Relationship between frequency deviation, to this frame, remaining respectively jumps into line frequency offset compensation.Every jump designs short unique code on this basis, is used for phase Carrier synchronization is completed in correction.Contradiction before this method effective solution frequency offset estimation accuracy and communication efficiency, so that high jump Coherent demodulation under fast big bandwidth frequency hopping communications is possibly realized.
Detailed description of the invention
Fig. 1 is system frame structure schematic diagram；
Fig. 2 frequency offset correction cellular construction schematic diagram；
Fig. 3 demodulates channel unit structural schematic diagram；
Fig. 4 frequency-hopping synchronization cellular construction schematic diagram；
Fig. 5 phase correction block structural schematic diagram.
Specific embodiment
Frequency deviation compensation system under a kind of fast frequency-hopped system in broadband of the present invention, including radio frequency solution jump unit, frequency-hopping synchronization Unit, matched filter, time synchronization unit, frequency offset correction unit, phase correction block；
Radio frequency solution jumps unit: obtaining system by the linear transformation to Direct Digital Frequency Synthesizers DDS output frequency needs The output signal frequency wanted, the transformation relation indicate that the frequency control word by changing DDS generates and receives signal frequency with f` Identical solution jumps local oscillator, which is provided by frequency-hopping synchronization unit；Local oscillator docking is jumped finally by obtained solution to collect mail Number quadrature frequency conversion and analog-to-digital conversion are carried out, obtains determining frequency zero intermediate frequency digital signal；
Frequency-hopping synchronization and frame synchronization unit: after system completes frequency-hopping synchronization and frame synchronization, hop counter is with the jump of a frame Number M is the period, carries out the counting as unit of jumping, count value 0,1 ... M-1；According to frequency hopping pattern, the frequency control of every jump is generated Word Fcw processed0, Fcw1…FcwM-1；M is positive integer；
Matched filter and time synchronization unit: matched filter is completed to determine frequency zero intermediate frequency digital signal to solution jump output Carry out matched filtering, filtering output result is sent into time synchronization unit and is timed recovery operation, final output signal it is best Sampled point；
Frequency offset correction unit: including frequency deviation estimating unit, compensating for frequency offset computing unit, frequency compensation unit；Offset estimation Unit jumps into row offset estimation to the guidance for receiving signal, and frequency offset calculation unit calculates each frequency for jumping signal in a frame Partially, frequency offset compensation element is completed to each frequency offset correction for jumping signal；
Skew of the phase correction block for correcting frequency offset correction element output signal.
The structure of the frame altogether by M jump constitute, every jumps has N number of symbol, wherein first jump by length be N1 unique code with The data that length is N-N1 are constituted, and the data that the unique code and length that remaining jump is N2 by length are N-N2 form, wherein N1 > N2。
F (the Fcwi) calculation method are as follows:
Wherein, T is the frequency multiplication multiple of frequency multiplier, and W is the bit wide of DDS, and Lo1, Lo2 respectively indicate frequency mixer local oscillator and DDS Multiple of this frame compared to local reference clock.
In the frequency deviation estimating unit, when frequency hopping count value is 0, frequency deviation estimating unit work, using auxiliary based on data The frequency excursion algorithm helped, the unique code for being N1 by length in this jump carry out offset estimation, obtain the benchmark frequency deviation of this frame fd0。
The course of work of the compensating for frequency offset computing unit is as follows:
Firstly, the frequency control word Fcw generated according to frequency-hopping synchronization unit0, Fcw1…FcwM-1And channel linear frequency conversion Relationship f calculates f (Fcw0), f (Fcw1)…f(FcwM-1)；Wherein f (Fcwi) it is the frequency control for controlling frequency hopping DDS frequency hopping The function of word, i=1,2...M-1；
Secondly, the benchmark frequency deviation estimated according to frequency deviation estimating unit, calculates and obtains frequency deviation parameterIts Middle Fcw0The frequency-hopping synchronization frequency control word jumped for first,
Finally, jumping corresponding frequency-hopping synchronization frequency control word according to different in this frame, the frequency deviation value f of each jump is calculateddi =f (Fcwi)*D。
The frequency offset compensation element includes data buffer unit, frequency deviation buffer cell and frequency deviation compensation multiplier composition；Number It is cached according to the complex data that buffer cell exports front-end module, and these data is divided into M group as unit of jumping；Frequency deviation The frequency deviation f for every jump that buffer cell calculates front-end modulediIt is cached, and generates twiddle factorFrequency deviation compensation Multiplier is gone to correct the data accordingly jumped with the frequency deviation of different jumps, obtains each hop count evidence of no frequency deviation:
Wherein, i=0,1...M-1；K=0,1...N-1；Ii(k)+j*QiIt (k) is the defeated of front end time synchronization unit output The optimum sampling point of signal out；K=0,1...N-1.
The course of work of the phase correction block are as follows:
Firstly, to the unique code of each jump signal received and local unique code carry out related operation (first jump it is related Length is N1, remaining correlation length jumped is N2), obtaining correlation is CorIi+j*CorQi, i=0,1,2...M-1, CorIi Represent the real part of correlation, CorQiRepresent the imaginary part of correlation；Secondly, calculating the phase of the correlativei=artan (CorQi/CorIi), i=0,1...M-1；Finally, phasing is carried out to the signal after correcting frequency offset, after obtaining frequency deviation compensation Signal constellation point:
Wherein, i=0,1...M-1；K=0,1...N-1.
1-5 and specific example are described further the present invention with reference to the accompanying drawing.
Assuming that current frequency-hopping system hop rate is 10000 jumps/s, character rate is 3Msps (every jump symbol N=300), selection It is N1=256, every frame hop count M=100 that pilot tone, which jumps unique code length,；Demodulating channel and selecting the bit wide of DDS is W=32；Frequency conversion chain Middle frequency multiplication multiple T=4；Local reference clock nominal value is 10MHz, Lo1=200 (frequency of this frame 1 is 2GHz), Lo2=100 (the reference local oscillator frequency of DDS is 1GHz).Assuming that frequency control word H " 66666666 " is jumped in guidance according to the rule of frequency hopping pattern, Second jumps frequency control word as H " 4CCCCCCD ".And assumes that the offset of local reference clock and Doppler shift are jumped in pilot tone and produce Raw synthesis frequency deviation is 10KHz, and the skew of the first jumper connection collection of letters number is π/4, and the skew of the second jumper connection collection of letters number is pi/2.
Frequency-hopping synchronization and frame synchronization unit: after frequency-hopping synchronization and frame synchronization completion, according to frequency hopping rate, every 100us Hop counter adds 1, is zeroed after counter to 299, and obtain
Fcw0=H " 66666666 " (1,717,986,918)
Fcw1=H " 4CCCCCCD " (1,288,490,189).
Radio frequency solution jumps unit, and according to exemplary parameter, if the nominal value according to local reference clock calculates, radio frequency solution is jumped single Two frequencies are respectively as follows: before this frame of the solution jump of member
F0=(20*10+100*10*Fcw1/2^32) * 16=38400MHz=38.4GHz
F1=(20*10+100*10*Fcw2/2^32) * 16=36800MHz=36.8GHz
Matched filter and time synchronization unit, according to the matching for the molding filtration waveform selection relevant parameter for sending signal Filter, and timing synchronization algorithm appropriate is used, completion timing is restored.
Frequency deviation estimating unit carries out based on number the length that pilot tone is jumped for 256 unique code when hop counter value is 0 According to the offset estimation of auxiliary, in the case where not considering noise, obtaining accurate frequency deviation value is 10KHz；
Compensating for frequency offset computing unit (only calculates the second frequency deviation jumped, other jumps are similar) here:
Firstly, being calculated according to channel frequency conversion relationship
Secondly, the benchmark frequency deviation estimated according to frequency deviation estimating unit, calculates frequency deviation parameter
Finally, being calculated when frequency-hopping synchronization is 1
The inclined calculation method of other frequency hoppings is similar.
Frequency offset compensation element, as shown, being cached to the input data of prime module, and to the frequency deviation being calculated Value is cached, and then goes the data accordingly jumped onto of calibration with the frequency deviation value of every jump, by taking double bounce before the as an example, last output data Position
Rec0(k)=[l0(k)+j*Q0(k)]*e-j2π*10000*k
Rec1(k)=[I1(k)+j*Q1(k)]*e-j2π*9583*k
Wherein, k=0,1...299.
Phase correction block, according to the skew of the preceding double bounce signal of hypothesis, the phase of available preceding double bounce correlation0 =pi/2, φ1=3 π/4.Therefore, available preceding double bounce signal constellation point is
Data1(k)=R1(k)*e-j*(π/2-π/4)=R1(k)*e-j*(π/4)
Data2(k)=R2(k)*e-j*(3π/4-π/4)=R2(k)*e-j*(π/4)
Wherein, k=0,1...N-1.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.

Claims (7)

1. the frequency deviation compensation system under a kind of fast frequency-hopped system in broadband, it is characterised in that: it is same to jump unit, frequency hopping including radio frequency solution Walk unit, matched filter, time synchronization unit, frequency offset correction unit, phase correction block；
Radio frequency solution jumps unit: obtaining the output signal frequency of system needs, the transformation by the linear transformation to DDS output frequency Relationship indicates that the frequency control word by changing DDS generates solution identical with signal frequency is received and jumps local oscillator, the frequency control with f` Word processed is provided by frequency-hopping synchronization unit；Jumping local oscillator finally by obtained solution, signal carries out quadrature frequency conversion and modulus turns to receiving It changes, obtains determining frequency zero intermediate frequency digital signal；
Frequency-hopping synchronization and frame synchronization unit: after system completes frequency-hopping synchronization and frame synchronization, hop counter is with the hop count M of a frame Period carries out the counting as unit of jumping, count value 0,1 ... M-1；According to frequency hopping pattern, the frequency control word of every jump is generated Fcw0, Fcw1…FcwM-1；M is positive integer；
Matched filter and time synchronization unit: the frequency zero intermediate frequency digital signal of determining that matched filter completes to jump solution output carries out Matched filtering, filtering output result are sent into time synchronization unit and are timed recovery operation, the optimum sampling of final output signal Point；
Frequency offset correction unit: including frequency deviation estimating unit, compensating for frequency offset computing unit, frequency compensation unit；Frequency deviation estimating unit Row offset estimation is jumped into the guidance for receiving signal, frequency offset calculation unit calculates each frequency deviation for jumping signal, frequency in a frame Offset compensation unit is completed to each frequency offset correction for jumping signal；
Phase correction block: the skew for correcting frequency offset correction element output signal.
2. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 1, it is characterised in that: described The structure of frame is made of M jump altogether, and every jump has N number of symbol, wherein unique code and length that the first jump is N1 by length are N-N1's Data are constituted, and the data that the unique code and length that remaining jump is N2 by length are N-N2 form, wherein N1 > N2.
3. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 2, it is characterised in that: described In frequency deviation estimating unit, when frequency hopping count value is 0, frequency deviation estimating unit work, using based on data-aided offset estimation Algorithm carries out offset estimation by the unique code that length in this jump is N1, obtains the benchmark frequency deviation f of this framed0。
4. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 3, it is characterised in that: described The course of work of compensating for frequency offset computing unit is as follows:
Firstly, the frequency control word Fcw generated according to frequency-hopping synchronization unit0, Fcw1…FcwM-1And transformation relation f, calculate f (Fcw0), f (Fcw1)…f(FcwM-1)；Wherein f (Fcwi) it is the function for controlling the frequency control word of frequency hopping DDS frequency hopping, i =1,2...M-1；
Secondly, the benchmark frequency deviation estimated according to frequency deviation estimating unit, calculates and obtains frequency deviation parameterWherein Fcw0 The frequency-hopping synchronization frequency control word jumped for first,
Finally, jumping corresponding frequency-hopping synchronization frequency control word according to different in this frame, the frequency deviation value f of each jump is calculateddi=f (Fcwi)*D。
5. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 4, it is characterised in that: described f(Fcwi) calculation method are as follows:
Wherein, T is the frequency multiplication multiple of frequency multiplier, and W is the bit wide of DDS, and Lo1, Lo2 respectively indicate frequency mixer local oscillator and DDS this frame Compared to the multiple of local reference clock.
6. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 2 or 5, it is characterised in that: The frequency offset compensation element includes data buffer unit, frequency deviation buffer cell and frequency deviation compensation multiplier composition；Data buffering list The complex data that member exports front-end module caches, and these data are divided into M group as unit of jumping；Frequency deviation buffer cell To the frequency deviation f for every jump that front-end module calculatesdiIt is cached, and generates twiddle factorFrequency deviation compensates multiplier and uses The frequency deviation that difference is jumped goes to correct the data accordingly jumped, and obtains each hop count evidence of no frequency deviation:
Wherein, i=0,1...M-1；K=0,1...N-1；Ii(k)+j*QiIt (k) is the output letter of front end time synchronization unit output Number optimum sampling point；K=0,1...N-1.
7. the frequency deviation compensation system under the fast frequency-hopped system in a kind of broadband according to claim 6, it is characterised in that: described The course of work of phase correction block are as follows:
Firstly, the unique code and local unique code to each jump signal received carry out related operation, obtaining correlation is CorIi+ j*CorQi, i=0,1,2...M-1, CorIiRepresent the real part of correlation, CorQiRepresent the imaginary part of correlation；It should secondly, calculating The phase of correlativei=artan (CorQi/CorIi), i=0,1...M-1；Finally, carrying out phase to the signal after correcting frequency offset Bit correction obtains the compensated signal constellation point of frequency deviation:
Wherein, i=0,1...M-1；K=0,1...N-1.
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